Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Synthesize TLB refill handlers at runtime. | |
7 | * | |
e30ec452 | 8 | * Copyright (C) 2004, 2005, 2006, 2008 Thiemo Seufer |
95affdda | 9 | * Copyright (C) 2005, 2007, 2008, 2009 Maciej W. Rozycki |
41c594ab | 10 | * Copyright (C) 2006 Ralf Baechle (ralf@linux-mips.org) |
fd062c84 | 11 | * Copyright (C) 2008, 2009 Cavium Networks, Inc. |
113c62d9 | 12 | * Copyright (C) 2011 MIPS Technologies, Inc. |
41c594ab RB |
13 | * |
14 | * ... and the days got worse and worse and now you see | |
15 | * I've gone completly out of my mind. | |
16 | * | |
17 | * They're coming to take me a away haha | |
18 | * they're coming to take me a away hoho hihi haha | |
19 | * to the funny farm where code is beautiful all the time ... | |
20 | * | |
21 | * (Condolences to Napoleon XIV) | |
1da177e4 LT |
22 | */ |
23 | ||
95affdda | 24 | #include <linux/bug.h> |
1da177e4 LT |
25 | #include <linux/kernel.h> |
26 | #include <linux/types.h> | |
631330f5 | 27 | #include <linux/smp.h> |
1da177e4 LT |
28 | #include <linux/string.h> |
29 | #include <linux/init.h> | |
3d8bfdd0 | 30 | #include <linux/cache.h> |
1da177e4 | 31 | |
3d8bfdd0 DD |
32 | #include <asm/cacheflush.h> |
33 | #include <asm/pgtable.h> | |
1da177e4 | 34 | #include <asm/war.h> |
3482d713 | 35 | #include <asm/uasm.h> |
b81947c6 | 36 | #include <asm/setup.h> |
e30ec452 | 37 | |
1ec56329 DD |
38 | /* |
39 | * TLB load/store/modify handlers. | |
40 | * | |
41 | * Only the fastpath gets synthesized at runtime, the slowpath for | |
42 | * do_page_fault remains normal asm. | |
43 | */ | |
44 | extern void tlb_do_page_fault_0(void); | |
45 | extern void tlb_do_page_fault_1(void); | |
46 | ||
bf28607f DD |
47 | struct work_registers { |
48 | int r1; | |
49 | int r2; | |
50 | int r3; | |
51 | }; | |
52 | ||
53 | struct tlb_reg_save { | |
54 | unsigned long a; | |
55 | unsigned long b; | |
56 | } ____cacheline_aligned_in_smp; | |
57 | ||
58 | static struct tlb_reg_save handler_reg_save[NR_CPUS]; | |
1ec56329 | 59 | |
aeffdbba | 60 | static inline int r45k_bvahwbug(void) |
1da177e4 LT |
61 | { |
62 | /* XXX: We should probe for the presence of this bug, but we don't. */ | |
63 | return 0; | |
64 | } | |
65 | ||
aeffdbba | 66 | static inline int r4k_250MHZhwbug(void) |
1da177e4 LT |
67 | { |
68 | /* XXX: We should probe for the presence of this bug, but we don't. */ | |
69 | return 0; | |
70 | } | |
71 | ||
aeffdbba | 72 | static inline int __maybe_unused bcm1250_m3_war(void) |
1da177e4 LT |
73 | { |
74 | return BCM1250_M3_WAR; | |
75 | } | |
76 | ||
aeffdbba | 77 | static inline int __maybe_unused r10000_llsc_war(void) |
1da177e4 LT |
78 | { |
79 | return R10000_LLSC_WAR; | |
80 | } | |
81 | ||
cc33ae43 DD |
82 | static int use_bbit_insns(void) |
83 | { | |
84 | switch (current_cpu_type()) { | |
85 | case CPU_CAVIUM_OCTEON: | |
86 | case CPU_CAVIUM_OCTEON_PLUS: | |
87 | case CPU_CAVIUM_OCTEON2: | |
88 | return 1; | |
89 | default: | |
90 | return 0; | |
91 | } | |
92 | } | |
93 | ||
2c8c53e2 DD |
94 | static int use_lwx_insns(void) |
95 | { | |
96 | switch (current_cpu_type()) { | |
97 | case CPU_CAVIUM_OCTEON2: | |
98 | return 1; | |
99 | default: | |
100 | return 0; | |
101 | } | |
102 | } | |
103 | #if defined(CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE) && \ | |
104 | CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE > 0 | |
105 | static bool scratchpad_available(void) | |
106 | { | |
107 | return true; | |
108 | } | |
109 | static int scratchpad_offset(int i) | |
110 | { | |
111 | /* | |
112 | * CVMSEG starts at address -32768 and extends for | |
113 | * CAVIUM_OCTEON_CVMSEG_SIZE 128 byte cache lines. | |
114 | */ | |
115 | i += 1; /* Kernel use starts at the top and works down. */ | |
116 | return CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE * 128 - (8 * i) - 32768; | |
117 | } | |
118 | #else | |
119 | static bool scratchpad_available(void) | |
120 | { | |
121 | return false; | |
122 | } | |
123 | static int scratchpad_offset(int i) | |
124 | { | |
125 | BUG(); | |
e1c87d2a DD |
126 | /* Really unreachable, but evidently some GCC want this. */ |
127 | return 0; | |
2c8c53e2 DD |
128 | } |
129 | #endif | |
8df5beac MR |
130 | /* |
131 | * Found by experiment: At least some revisions of the 4kc throw under | |
132 | * some circumstances a machine check exception, triggered by invalid | |
133 | * values in the index register. Delaying the tlbp instruction until | |
134 | * after the next branch, plus adding an additional nop in front of | |
135 | * tlbwi/tlbwr avoids the invalid index register values. Nobody knows | |
136 | * why; it's not an issue caused by the core RTL. | |
137 | * | |
138 | */ | |
234fcd14 | 139 | static int __cpuinit m4kc_tlbp_war(void) |
8df5beac MR |
140 | { |
141 | return (current_cpu_data.processor_id & 0xffff00) == | |
142 | (PRID_COMP_MIPS | PRID_IMP_4KC); | |
143 | } | |
144 | ||
e30ec452 | 145 | /* Handle labels (which must be positive integers). */ |
1da177e4 | 146 | enum label_id { |
e30ec452 | 147 | label_second_part = 1, |
1da177e4 LT |
148 | label_leave, |
149 | label_vmalloc, | |
150 | label_vmalloc_done, | |
151 | label_tlbw_hazard, | |
152 | label_split, | |
6dd9344c DD |
153 | label_tlbl_goaround1, |
154 | label_tlbl_goaround2, | |
1da177e4 LT |
155 | label_nopage_tlbl, |
156 | label_nopage_tlbs, | |
157 | label_nopage_tlbm, | |
158 | label_smp_pgtable_change, | |
159 | label_r3000_write_probe_fail, | |
1ec56329 | 160 | label_large_segbits_fault, |
fd062c84 DD |
161 | #ifdef CONFIG_HUGETLB_PAGE |
162 | label_tlb_huge_update, | |
163 | #endif | |
1da177e4 LT |
164 | }; |
165 | ||
e30ec452 TS |
166 | UASM_L_LA(_second_part) |
167 | UASM_L_LA(_leave) | |
e30ec452 TS |
168 | UASM_L_LA(_vmalloc) |
169 | UASM_L_LA(_vmalloc_done) | |
170 | UASM_L_LA(_tlbw_hazard) | |
171 | UASM_L_LA(_split) | |
6dd9344c DD |
172 | UASM_L_LA(_tlbl_goaround1) |
173 | UASM_L_LA(_tlbl_goaround2) | |
e30ec452 TS |
174 | UASM_L_LA(_nopage_tlbl) |
175 | UASM_L_LA(_nopage_tlbs) | |
176 | UASM_L_LA(_nopage_tlbm) | |
177 | UASM_L_LA(_smp_pgtable_change) | |
178 | UASM_L_LA(_r3000_write_probe_fail) | |
1ec56329 | 179 | UASM_L_LA(_large_segbits_fault) |
fd062c84 DD |
180 | #ifdef CONFIG_HUGETLB_PAGE |
181 | UASM_L_LA(_tlb_huge_update) | |
182 | #endif | |
656be92f | 183 | |
92b1e6a6 FBH |
184 | /* |
185 | * For debug purposes. | |
186 | */ | |
187 | static inline void dump_handler(const u32 *handler, int count) | |
188 | { | |
189 | int i; | |
190 | ||
191 | pr_debug("\t.set push\n"); | |
192 | pr_debug("\t.set noreorder\n"); | |
193 | ||
194 | for (i = 0; i < count; i++) | |
195 | pr_debug("\t%p\t.word 0x%08x\n", &handler[i], handler[i]); | |
196 | ||
197 | pr_debug("\t.set pop\n"); | |
198 | } | |
199 | ||
1da177e4 LT |
200 | /* The only general purpose registers allowed in TLB handlers. */ |
201 | #define K0 26 | |
202 | #define K1 27 | |
203 | ||
204 | /* Some CP0 registers */ | |
41c594ab RB |
205 | #define C0_INDEX 0, 0 |
206 | #define C0_ENTRYLO0 2, 0 | |
207 | #define C0_TCBIND 2, 2 | |
208 | #define C0_ENTRYLO1 3, 0 | |
209 | #define C0_CONTEXT 4, 0 | |
fd062c84 | 210 | #define C0_PAGEMASK 5, 0 |
41c594ab RB |
211 | #define C0_BADVADDR 8, 0 |
212 | #define C0_ENTRYHI 10, 0 | |
213 | #define C0_EPC 14, 0 | |
214 | #define C0_XCONTEXT 20, 0 | |
1da177e4 | 215 | |
875d43e7 | 216 | #ifdef CONFIG_64BIT |
e30ec452 | 217 | # define GET_CONTEXT(buf, reg) UASM_i_MFC0(buf, reg, C0_XCONTEXT) |
1da177e4 | 218 | #else |
e30ec452 | 219 | # define GET_CONTEXT(buf, reg) UASM_i_MFC0(buf, reg, C0_CONTEXT) |
1da177e4 LT |
220 | #endif |
221 | ||
222 | /* The worst case length of the handler is around 18 instructions for | |
223 | * R3000-style TLBs and up to 63 instructions for R4000-style TLBs. | |
224 | * Maximum space available is 32 instructions for R3000 and 64 | |
225 | * instructions for R4000. | |
226 | * | |
227 | * We deliberately chose a buffer size of 128, so we won't scribble | |
228 | * over anything important on overflow before we panic. | |
229 | */ | |
234fcd14 | 230 | static u32 tlb_handler[128] __cpuinitdata; |
1da177e4 LT |
231 | |
232 | /* simply assume worst case size for labels and relocs */ | |
234fcd14 RB |
233 | static struct uasm_label labels[128] __cpuinitdata; |
234 | static struct uasm_reloc relocs[128] __cpuinitdata; | |
1da177e4 | 235 | |
1ec56329 DD |
236 | #ifdef CONFIG_64BIT |
237 | static int check_for_high_segbits __cpuinitdata; | |
238 | #endif | |
239 | ||
2c8c53e2 | 240 | static int check_for_high_segbits __cpuinitdata; |
3d8bfdd0 DD |
241 | |
242 | static unsigned int kscratch_used_mask __cpuinitdata; | |
243 | ||
244 | static int __cpuinit allocate_kscratch(void) | |
245 | { | |
246 | int r; | |
247 | unsigned int a = cpu_data[0].kscratch_mask & ~kscratch_used_mask; | |
248 | ||
249 | r = ffs(a); | |
250 | ||
251 | if (r == 0) | |
252 | return -1; | |
253 | ||
254 | r--; /* make it zero based */ | |
255 | ||
256 | kscratch_used_mask |= (1 << r); | |
257 | ||
258 | return r; | |
259 | } | |
260 | ||
2c8c53e2 | 261 | static int scratch_reg __cpuinitdata; |
3d8bfdd0 | 262 | static int pgd_reg __cpuinitdata; |
2c8c53e2 DD |
263 | enum vmalloc64_mode {not_refill, refill_scratch, refill_noscratch}; |
264 | ||
bf28607f DD |
265 | static struct work_registers __cpuinit build_get_work_registers(u32 **p) |
266 | { | |
267 | struct work_registers r; | |
268 | ||
269 | int smp_processor_id_reg; | |
270 | int smp_processor_id_sel; | |
271 | int smp_processor_id_shift; | |
272 | ||
273 | if (scratch_reg > 0) { | |
274 | /* Save in CPU local C0_KScratch? */ | |
275 | UASM_i_MTC0(p, 1, 31, scratch_reg); | |
276 | r.r1 = K0; | |
277 | r.r2 = K1; | |
278 | r.r3 = 1; | |
279 | return r; | |
280 | } | |
281 | ||
282 | if (num_possible_cpus() > 1) { | |
283 | #ifdef CONFIG_MIPS_PGD_C0_CONTEXT | |
284 | smp_processor_id_shift = 51; | |
285 | smp_processor_id_reg = 20; /* XContext */ | |
286 | smp_processor_id_sel = 0; | |
287 | #else | |
288 | # ifdef CONFIG_32BIT | |
289 | smp_processor_id_shift = 25; | |
290 | smp_processor_id_reg = 4; /* Context */ | |
291 | smp_processor_id_sel = 0; | |
292 | # endif | |
293 | # ifdef CONFIG_64BIT | |
294 | smp_processor_id_shift = 26; | |
295 | smp_processor_id_reg = 4; /* Context */ | |
296 | smp_processor_id_sel = 0; | |
297 | # endif | |
298 | #endif | |
299 | /* Get smp_processor_id */ | |
300 | UASM_i_MFC0(p, K0, smp_processor_id_reg, smp_processor_id_sel); | |
301 | UASM_i_SRL_SAFE(p, K0, K0, smp_processor_id_shift); | |
302 | ||
303 | /* handler_reg_save index in K0 */ | |
304 | UASM_i_SLL(p, K0, K0, ilog2(sizeof(struct tlb_reg_save))); | |
305 | ||
306 | UASM_i_LA(p, K1, (long)&handler_reg_save); | |
307 | UASM_i_ADDU(p, K0, K0, K1); | |
308 | } else { | |
309 | UASM_i_LA(p, K0, (long)&handler_reg_save); | |
310 | } | |
311 | /* K0 now points to save area, save $1 and $2 */ | |
312 | UASM_i_SW(p, 1, offsetof(struct tlb_reg_save, a), K0); | |
313 | UASM_i_SW(p, 2, offsetof(struct tlb_reg_save, b), K0); | |
314 | ||
315 | r.r1 = K1; | |
316 | r.r2 = 1; | |
317 | r.r3 = 2; | |
318 | return r; | |
319 | } | |
320 | ||
321 | static void __cpuinit build_restore_work_registers(u32 **p) | |
322 | { | |
323 | if (scratch_reg > 0) { | |
324 | UASM_i_MFC0(p, 1, 31, scratch_reg); | |
325 | return; | |
326 | } | |
327 | /* K0 already points to save area, restore $1 and $2 */ | |
328 | UASM_i_LW(p, 1, offsetof(struct tlb_reg_save, a), K0); | |
329 | UASM_i_LW(p, 2, offsetof(struct tlb_reg_save, b), K0); | |
330 | } | |
331 | ||
2c8c53e2 | 332 | #ifndef CONFIG_MIPS_PGD_C0_CONTEXT |
3d8bfdd0 | 333 | |
82622284 DD |
334 | /* |
335 | * CONFIG_MIPS_PGD_C0_CONTEXT implies 64 bit and lack of pgd_current, | |
336 | * we cannot do r3000 under these circumstances. | |
3d8bfdd0 DD |
337 | * |
338 | * Declare pgd_current here instead of including mmu_context.h to avoid type | |
339 | * conflicts for tlbmiss_handler_setup_pgd | |
82622284 | 340 | */ |
3d8bfdd0 | 341 | extern unsigned long pgd_current[]; |
82622284 | 342 | |
1da177e4 LT |
343 | /* |
344 | * The R3000 TLB handler is simple. | |
345 | */ | |
234fcd14 | 346 | static void __cpuinit build_r3000_tlb_refill_handler(void) |
1da177e4 LT |
347 | { |
348 | long pgdc = (long)pgd_current; | |
349 | u32 *p; | |
350 | ||
351 | memset(tlb_handler, 0, sizeof(tlb_handler)); | |
352 | p = tlb_handler; | |
353 | ||
e30ec452 TS |
354 | uasm_i_mfc0(&p, K0, C0_BADVADDR); |
355 | uasm_i_lui(&p, K1, uasm_rel_hi(pgdc)); /* cp0 delay */ | |
356 | uasm_i_lw(&p, K1, uasm_rel_lo(pgdc), K1); | |
357 | uasm_i_srl(&p, K0, K0, 22); /* load delay */ | |
358 | uasm_i_sll(&p, K0, K0, 2); | |
359 | uasm_i_addu(&p, K1, K1, K0); | |
360 | uasm_i_mfc0(&p, K0, C0_CONTEXT); | |
361 | uasm_i_lw(&p, K1, 0, K1); /* cp0 delay */ | |
362 | uasm_i_andi(&p, K0, K0, 0xffc); /* load delay */ | |
363 | uasm_i_addu(&p, K1, K1, K0); | |
364 | uasm_i_lw(&p, K0, 0, K1); | |
365 | uasm_i_nop(&p); /* load delay */ | |
366 | uasm_i_mtc0(&p, K0, C0_ENTRYLO0); | |
367 | uasm_i_mfc0(&p, K1, C0_EPC); /* cp0 delay */ | |
368 | uasm_i_tlbwr(&p); /* cp0 delay */ | |
369 | uasm_i_jr(&p, K1); | |
370 | uasm_i_rfe(&p); /* branch delay */ | |
1da177e4 LT |
371 | |
372 | if (p > tlb_handler + 32) | |
373 | panic("TLB refill handler space exceeded"); | |
374 | ||
e30ec452 TS |
375 | pr_debug("Wrote TLB refill handler (%u instructions).\n", |
376 | (unsigned int)(p - tlb_handler)); | |
1da177e4 | 377 | |
91b05e67 | 378 | memcpy((void *)ebase, tlb_handler, 0x80); |
92b1e6a6 FBH |
379 | |
380 | dump_handler((u32 *)ebase, 32); | |
1da177e4 | 381 | } |
82622284 | 382 | #endif /* CONFIG_MIPS_PGD_C0_CONTEXT */ |
1da177e4 LT |
383 | |
384 | /* | |
385 | * The R4000 TLB handler is much more complicated. We have two | |
386 | * consecutive handler areas with 32 instructions space each. | |
387 | * Since they aren't used at the same time, we can overflow in the | |
388 | * other one.To keep things simple, we first assume linear space, | |
389 | * then we relocate it to the final handler layout as needed. | |
390 | */ | |
234fcd14 | 391 | static u32 final_handler[64] __cpuinitdata; |
1da177e4 LT |
392 | |
393 | /* | |
394 | * Hazards | |
395 | * | |
396 | * From the IDT errata for the QED RM5230 (Nevada), processor revision 1.0: | |
397 | * 2. A timing hazard exists for the TLBP instruction. | |
398 | * | |
399 | * stalling_instruction | |
400 | * TLBP | |
401 | * | |
402 | * The JTLB is being read for the TLBP throughout the stall generated by the | |
403 | * previous instruction. This is not really correct as the stalling instruction | |
404 | * can modify the address used to access the JTLB. The failure symptom is that | |
405 | * the TLBP instruction will use an address created for the stalling instruction | |
406 | * and not the address held in C0_ENHI and thus report the wrong results. | |
407 | * | |
408 | * The software work-around is to not allow the instruction preceding the TLBP | |
409 | * to stall - make it an NOP or some other instruction guaranteed not to stall. | |
410 | * | |
411 | * Errata 2 will not be fixed. This errata is also on the R5000. | |
412 | * | |
413 | * As if we MIPS hackers wouldn't know how to nop pipelines happy ... | |
414 | */ | |
234fcd14 | 415 | static void __cpuinit __maybe_unused build_tlb_probe_entry(u32 **p) |
1da177e4 | 416 | { |
10cc3529 | 417 | switch (current_cpu_type()) { |
326e2e1a | 418 | /* Found by experiment: R4600 v2.0/R4700 needs this, too. */ |
f5b4d956 | 419 | case CPU_R4600: |
326e2e1a | 420 | case CPU_R4700: |
1da177e4 LT |
421 | case CPU_R5000: |
422 | case CPU_R5000A: | |
423 | case CPU_NEVADA: | |
e30ec452 TS |
424 | uasm_i_nop(p); |
425 | uasm_i_tlbp(p); | |
1da177e4 LT |
426 | break; |
427 | ||
428 | default: | |
e30ec452 | 429 | uasm_i_tlbp(p); |
1da177e4 LT |
430 | break; |
431 | } | |
432 | } | |
433 | ||
434 | /* | |
435 | * Write random or indexed TLB entry, and care about the hazards from | |
25985edc | 436 | * the preceding mtc0 and for the following eret. |
1da177e4 LT |
437 | */ |
438 | enum tlb_write_entry { tlb_random, tlb_indexed }; | |
439 | ||
234fcd14 | 440 | static void __cpuinit build_tlb_write_entry(u32 **p, struct uasm_label **l, |
e30ec452 | 441 | struct uasm_reloc **r, |
1da177e4 LT |
442 | enum tlb_write_entry wmode) |
443 | { | |
444 | void(*tlbw)(u32 **) = NULL; | |
445 | ||
446 | switch (wmode) { | |
e30ec452 TS |
447 | case tlb_random: tlbw = uasm_i_tlbwr; break; |
448 | case tlb_indexed: tlbw = uasm_i_tlbwi; break; | |
1da177e4 LT |
449 | } |
450 | ||
161548bf | 451 | if (cpu_has_mips_r2) { |
41f0e4d0 DD |
452 | if (cpu_has_mips_r2_exec_hazard) |
453 | uasm_i_ehb(p); | |
161548bf RB |
454 | tlbw(p); |
455 | return; | |
456 | } | |
457 | ||
10cc3529 | 458 | switch (current_cpu_type()) { |
1da177e4 LT |
459 | case CPU_R4000PC: |
460 | case CPU_R4000SC: | |
461 | case CPU_R4000MC: | |
462 | case CPU_R4400PC: | |
463 | case CPU_R4400SC: | |
464 | case CPU_R4400MC: | |
465 | /* | |
466 | * This branch uses up a mtc0 hazard nop slot and saves | |
467 | * two nops after the tlbw instruction. | |
468 | */ | |
e30ec452 | 469 | uasm_il_bgezl(p, r, 0, label_tlbw_hazard); |
1da177e4 | 470 | tlbw(p); |
e30ec452 TS |
471 | uasm_l_tlbw_hazard(l, *p); |
472 | uasm_i_nop(p); | |
1da177e4 LT |
473 | break; |
474 | ||
475 | case CPU_R4600: | |
476 | case CPU_R4700: | |
477 | case CPU_R5000: | |
478 | case CPU_R5000A: | |
e30ec452 | 479 | uasm_i_nop(p); |
2c93e12c | 480 | tlbw(p); |
e30ec452 | 481 | uasm_i_nop(p); |
2c93e12c MR |
482 | break; |
483 | ||
484 | case CPU_R4300: | |
1da177e4 LT |
485 | case CPU_5KC: |
486 | case CPU_TX49XX: | |
bdf21b18 | 487 | case CPU_PR4450: |
efa0f81c | 488 | case CPU_XLR: |
e30ec452 | 489 | uasm_i_nop(p); |
1da177e4 LT |
490 | tlbw(p); |
491 | break; | |
492 | ||
493 | case CPU_R10000: | |
494 | case CPU_R12000: | |
44d921b2 | 495 | case CPU_R14000: |
1da177e4 | 496 | case CPU_4KC: |
b1ec4c8e | 497 | case CPU_4KEC: |
113c62d9 | 498 | case CPU_M14KC: |
1da177e4 | 499 | case CPU_SB1: |
93ce2f52 | 500 | case CPU_SB1A: |
1da177e4 LT |
501 | case CPU_4KSC: |
502 | case CPU_20KC: | |
503 | case CPU_25KF: | |
602977b0 KC |
504 | case CPU_BMIPS32: |
505 | case CPU_BMIPS3300: | |
506 | case CPU_BMIPS4350: | |
507 | case CPU_BMIPS4380: | |
508 | case CPU_BMIPS5000: | |
2a21c730 | 509 | case CPU_LOONGSON2: |
a644b277 | 510 | case CPU_R5500: |
8df5beac | 511 | if (m4kc_tlbp_war()) |
e30ec452 | 512 | uasm_i_nop(p); |
2f794d09 | 513 | case CPU_ALCHEMY: |
1da177e4 LT |
514 | tlbw(p); |
515 | break; | |
516 | ||
517 | case CPU_NEVADA: | |
e30ec452 | 518 | uasm_i_nop(p); /* QED specifies 2 nops hazard */ |
1da177e4 LT |
519 | /* |
520 | * This branch uses up a mtc0 hazard nop slot and saves | |
521 | * a nop after the tlbw instruction. | |
522 | */ | |
e30ec452 | 523 | uasm_il_bgezl(p, r, 0, label_tlbw_hazard); |
1da177e4 | 524 | tlbw(p); |
e30ec452 | 525 | uasm_l_tlbw_hazard(l, *p); |
1da177e4 LT |
526 | break; |
527 | ||
528 | case CPU_RM7000: | |
e30ec452 TS |
529 | uasm_i_nop(p); |
530 | uasm_i_nop(p); | |
531 | uasm_i_nop(p); | |
532 | uasm_i_nop(p); | |
1da177e4 LT |
533 | tlbw(p); |
534 | break; | |
535 | ||
1da177e4 LT |
536 | case CPU_RM9000: |
537 | /* | |
538 | * When the JTLB is updated by tlbwi or tlbwr, a subsequent | |
539 | * use of the JTLB for instructions should not occur for 4 | |
540 | * cpu cycles and use for data translations should not occur | |
541 | * for 3 cpu cycles. | |
542 | */ | |
e30ec452 TS |
543 | uasm_i_ssnop(p); |
544 | uasm_i_ssnop(p); | |
545 | uasm_i_ssnop(p); | |
546 | uasm_i_ssnop(p); | |
1da177e4 | 547 | tlbw(p); |
e30ec452 TS |
548 | uasm_i_ssnop(p); |
549 | uasm_i_ssnop(p); | |
550 | uasm_i_ssnop(p); | |
551 | uasm_i_ssnop(p); | |
1da177e4 LT |
552 | break; |
553 | ||
554 | case CPU_VR4111: | |
555 | case CPU_VR4121: | |
556 | case CPU_VR4122: | |
557 | case CPU_VR4181: | |
558 | case CPU_VR4181A: | |
e30ec452 TS |
559 | uasm_i_nop(p); |
560 | uasm_i_nop(p); | |
1da177e4 | 561 | tlbw(p); |
e30ec452 TS |
562 | uasm_i_nop(p); |
563 | uasm_i_nop(p); | |
1da177e4 LT |
564 | break; |
565 | ||
566 | case CPU_VR4131: | |
567 | case CPU_VR4133: | |
7623debf | 568 | case CPU_R5432: |
e30ec452 TS |
569 | uasm_i_nop(p); |
570 | uasm_i_nop(p); | |
1da177e4 LT |
571 | tlbw(p); |
572 | break; | |
573 | ||
83ccf69d LPC |
574 | case CPU_JZRISC: |
575 | tlbw(p); | |
576 | uasm_i_nop(p); | |
577 | break; | |
578 | ||
1da177e4 LT |
579 | default: |
580 | panic("No TLB refill handler yet (CPU type: %d)", | |
581 | current_cpu_data.cputype); | |
582 | break; | |
583 | } | |
584 | } | |
585 | ||
6dd9344c DD |
586 | static __cpuinit __maybe_unused void build_convert_pte_to_entrylo(u32 **p, |
587 | unsigned int reg) | |
fd062c84 | 588 | { |
6dd9344c DD |
589 | if (kernel_uses_smartmips_rixi) { |
590 | UASM_i_SRL(p, reg, reg, ilog2(_PAGE_NO_EXEC)); | |
591 | UASM_i_ROTR(p, reg, reg, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC)); | |
592 | } else { | |
593 | #ifdef CONFIG_64BIT_PHYS_ADDR | |
3be6022c | 594 | uasm_i_dsrl_safe(p, reg, reg, ilog2(_PAGE_GLOBAL)); |
6dd9344c DD |
595 | #else |
596 | UASM_i_SRL(p, reg, reg, ilog2(_PAGE_GLOBAL)); | |
597 | #endif | |
598 | } | |
599 | } | |
fd062c84 | 600 | |
6dd9344c | 601 | #ifdef CONFIG_HUGETLB_PAGE |
fd062c84 | 602 | |
6dd9344c DD |
603 | static __cpuinit void build_restore_pagemask(u32 **p, |
604 | struct uasm_reloc **r, | |
605 | unsigned int tmp, | |
2c8c53e2 DD |
606 | enum label_id lid, |
607 | int restore_scratch) | |
6dd9344c | 608 | { |
2c8c53e2 DD |
609 | if (restore_scratch) { |
610 | /* Reset default page size */ | |
611 | if (PM_DEFAULT_MASK >> 16) { | |
612 | uasm_i_lui(p, tmp, PM_DEFAULT_MASK >> 16); | |
613 | uasm_i_ori(p, tmp, tmp, PM_DEFAULT_MASK & 0xffff); | |
614 | uasm_i_mtc0(p, tmp, C0_PAGEMASK); | |
615 | uasm_il_b(p, r, lid); | |
616 | } else if (PM_DEFAULT_MASK) { | |
617 | uasm_i_ori(p, tmp, 0, PM_DEFAULT_MASK); | |
618 | uasm_i_mtc0(p, tmp, C0_PAGEMASK); | |
619 | uasm_il_b(p, r, lid); | |
620 | } else { | |
621 | uasm_i_mtc0(p, 0, C0_PAGEMASK); | |
622 | uasm_il_b(p, r, lid); | |
623 | } | |
624 | if (scratch_reg > 0) | |
625 | UASM_i_MFC0(p, 1, 31, scratch_reg); | |
626 | else | |
627 | UASM_i_LW(p, 1, scratchpad_offset(0), 0); | |
fd062c84 | 628 | } else { |
2c8c53e2 DD |
629 | /* Reset default page size */ |
630 | if (PM_DEFAULT_MASK >> 16) { | |
631 | uasm_i_lui(p, tmp, PM_DEFAULT_MASK >> 16); | |
632 | uasm_i_ori(p, tmp, tmp, PM_DEFAULT_MASK & 0xffff); | |
633 | uasm_il_b(p, r, lid); | |
634 | uasm_i_mtc0(p, tmp, C0_PAGEMASK); | |
635 | } else if (PM_DEFAULT_MASK) { | |
636 | uasm_i_ori(p, tmp, 0, PM_DEFAULT_MASK); | |
637 | uasm_il_b(p, r, lid); | |
638 | uasm_i_mtc0(p, tmp, C0_PAGEMASK); | |
639 | } else { | |
640 | uasm_il_b(p, r, lid); | |
641 | uasm_i_mtc0(p, 0, C0_PAGEMASK); | |
642 | } | |
fd062c84 DD |
643 | } |
644 | } | |
645 | ||
6dd9344c DD |
646 | static __cpuinit void build_huge_tlb_write_entry(u32 **p, |
647 | struct uasm_label **l, | |
648 | struct uasm_reloc **r, | |
649 | unsigned int tmp, | |
2c8c53e2 DD |
650 | enum tlb_write_entry wmode, |
651 | int restore_scratch) | |
6dd9344c DD |
652 | { |
653 | /* Set huge page tlb entry size */ | |
654 | uasm_i_lui(p, tmp, PM_HUGE_MASK >> 16); | |
655 | uasm_i_ori(p, tmp, tmp, PM_HUGE_MASK & 0xffff); | |
656 | uasm_i_mtc0(p, tmp, C0_PAGEMASK); | |
657 | ||
658 | build_tlb_write_entry(p, l, r, wmode); | |
659 | ||
2c8c53e2 | 660 | build_restore_pagemask(p, r, tmp, label_leave, restore_scratch); |
6dd9344c DD |
661 | } |
662 | ||
fd062c84 DD |
663 | /* |
664 | * Check if Huge PTE is present, if so then jump to LABEL. | |
665 | */ | |
666 | static void __cpuinit | |
667 | build_is_huge_pte(u32 **p, struct uasm_reloc **r, unsigned int tmp, | |
668 | unsigned int pmd, int lid) | |
669 | { | |
670 | UASM_i_LW(p, tmp, 0, pmd); | |
cc33ae43 DD |
671 | if (use_bbit_insns()) { |
672 | uasm_il_bbit1(p, r, tmp, ilog2(_PAGE_HUGE), lid); | |
673 | } else { | |
674 | uasm_i_andi(p, tmp, tmp, _PAGE_HUGE); | |
675 | uasm_il_bnez(p, r, tmp, lid); | |
676 | } | |
fd062c84 DD |
677 | } |
678 | ||
679 | static __cpuinit void build_huge_update_entries(u32 **p, | |
680 | unsigned int pte, | |
681 | unsigned int tmp) | |
682 | { | |
683 | int small_sequence; | |
684 | ||
685 | /* | |
686 | * A huge PTE describes an area the size of the | |
687 | * configured huge page size. This is twice the | |
688 | * of the large TLB entry size we intend to use. | |
689 | * A TLB entry half the size of the configured | |
690 | * huge page size is configured into entrylo0 | |
691 | * and entrylo1 to cover the contiguous huge PTE | |
692 | * address space. | |
693 | */ | |
694 | small_sequence = (HPAGE_SIZE >> 7) < 0x10000; | |
695 | ||
696 | /* We can clobber tmp. It isn't used after this.*/ | |
697 | if (!small_sequence) | |
698 | uasm_i_lui(p, tmp, HPAGE_SIZE >> (7 + 16)); | |
699 | ||
6dd9344c | 700 | build_convert_pte_to_entrylo(p, pte); |
9b8c3891 | 701 | UASM_i_MTC0(p, pte, C0_ENTRYLO0); /* load it */ |
fd062c84 DD |
702 | /* convert to entrylo1 */ |
703 | if (small_sequence) | |
704 | UASM_i_ADDIU(p, pte, pte, HPAGE_SIZE >> 7); | |
705 | else | |
706 | UASM_i_ADDU(p, pte, pte, tmp); | |
707 | ||
9b8c3891 | 708 | UASM_i_MTC0(p, pte, C0_ENTRYLO1); /* load it */ |
fd062c84 DD |
709 | } |
710 | ||
711 | static __cpuinit void build_huge_handler_tail(u32 **p, | |
712 | struct uasm_reloc **r, | |
713 | struct uasm_label **l, | |
714 | unsigned int pte, | |
715 | unsigned int ptr) | |
716 | { | |
717 | #ifdef CONFIG_SMP | |
718 | UASM_i_SC(p, pte, 0, ptr); | |
719 | uasm_il_beqz(p, r, pte, label_tlb_huge_update); | |
720 | UASM_i_LW(p, pte, 0, ptr); /* Needed because SC killed our PTE */ | |
721 | #else | |
722 | UASM_i_SW(p, pte, 0, ptr); | |
723 | #endif | |
724 | build_huge_update_entries(p, pte, ptr); | |
2c8c53e2 | 725 | build_huge_tlb_write_entry(p, l, r, pte, tlb_indexed, 0); |
fd062c84 DD |
726 | } |
727 | #endif /* CONFIG_HUGETLB_PAGE */ | |
728 | ||
875d43e7 | 729 | #ifdef CONFIG_64BIT |
1da177e4 LT |
730 | /* |
731 | * TMP and PTR are scratch. | |
732 | * TMP will be clobbered, PTR will hold the pmd entry. | |
733 | */ | |
234fcd14 | 734 | static void __cpuinit |
e30ec452 | 735 | build_get_pmde64(u32 **p, struct uasm_label **l, struct uasm_reloc **r, |
1da177e4 LT |
736 | unsigned int tmp, unsigned int ptr) |
737 | { | |
82622284 | 738 | #ifndef CONFIG_MIPS_PGD_C0_CONTEXT |
1da177e4 | 739 | long pgdc = (long)pgd_current; |
82622284 | 740 | #endif |
1da177e4 LT |
741 | /* |
742 | * The vmalloc handling is not in the hotpath. | |
743 | */ | |
e30ec452 | 744 | uasm_i_dmfc0(p, tmp, C0_BADVADDR); |
1ec56329 DD |
745 | |
746 | if (check_for_high_segbits) { | |
747 | /* | |
748 | * The kernel currently implicitely assumes that the | |
749 | * MIPS SEGBITS parameter for the processor is | |
750 | * (PGDIR_SHIFT+PGDIR_BITS) or less, and will never | |
751 | * allocate virtual addresses outside the maximum | |
752 | * range for SEGBITS = (PGDIR_SHIFT+PGDIR_BITS). But | |
753 | * that doesn't prevent user code from accessing the | |
754 | * higher xuseg addresses. Here, we make sure that | |
755 | * everything but the lower xuseg addresses goes down | |
756 | * the module_alloc/vmalloc path. | |
757 | */ | |
758 | uasm_i_dsrl_safe(p, ptr, tmp, PGDIR_SHIFT + PGD_ORDER + PAGE_SHIFT - 3); | |
759 | uasm_il_bnez(p, r, ptr, label_vmalloc); | |
760 | } else { | |
761 | uasm_il_bltz(p, r, tmp, label_vmalloc); | |
762 | } | |
e30ec452 | 763 | /* No uasm_i_nop needed here, since the next insn doesn't touch TMP. */ |
1da177e4 | 764 | |
82622284 | 765 | #ifdef CONFIG_MIPS_PGD_C0_CONTEXT |
3d8bfdd0 DD |
766 | if (pgd_reg != -1) { |
767 | /* pgd is in pgd_reg */ | |
768 | UASM_i_MFC0(p, ptr, 31, pgd_reg); | |
769 | } else { | |
770 | /* | |
771 | * &pgd << 11 stored in CONTEXT [23..63]. | |
772 | */ | |
773 | UASM_i_MFC0(p, ptr, C0_CONTEXT); | |
774 | ||
775 | /* Clear lower 23 bits of context. */ | |
776 | uasm_i_dins(p, ptr, 0, 0, 23); | |
777 | ||
778 | /* 1 0 1 0 1 << 6 xkphys cached */ | |
779 | uasm_i_ori(p, ptr, ptr, 0x540); | |
780 | uasm_i_drotr(p, ptr, ptr, 11); | |
781 | } | |
82622284 | 782 | #elif defined(CONFIG_SMP) |
41c594ab RB |
783 | # ifdef CONFIG_MIPS_MT_SMTC |
784 | /* | |
785 | * SMTC uses TCBind value as "CPU" index | |
786 | */ | |
e30ec452 | 787 | uasm_i_mfc0(p, ptr, C0_TCBIND); |
3be6022c | 788 | uasm_i_dsrl_safe(p, ptr, ptr, 19); |
41c594ab | 789 | # else |
1da177e4 | 790 | /* |
1b3a6e97 | 791 | * 64 bit SMP running in XKPHYS has smp_processor_id() << 3 |
1da177e4 LT |
792 | * stored in CONTEXT. |
793 | */ | |
e30ec452 | 794 | uasm_i_dmfc0(p, ptr, C0_CONTEXT); |
3be6022c | 795 | uasm_i_dsrl_safe(p, ptr, ptr, 23); |
82622284 | 796 | # endif |
e30ec452 TS |
797 | UASM_i_LA_mostly(p, tmp, pgdc); |
798 | uasm_i_daddu(p, ptr, ptr, tmp); | |
799 | uasm_i_dmfc0(p, tmp, C0_BADVADDR); | |
800 | uasm_i_ld(p, ptr, uasm_rel_lo(pgdc), ptr); | |
1da177e4 | 801 | #else |
e30ec452 TS |
802 | UASM_i_LA_mostly(p, ptr, pgdc); |
803 | uasm_i_ld(p, ptr, uasm_rel_lo(pgdc), ptr); | |
1da177e4 LT |
804 | #endif |
805 | ||
e30ec452 | 806 | uasm_l_vmalloc_done(l, *p); |
242954b5 | 807 | |
3be6022c DD |
808 | /* get pgd offset in bytes */ |
809 | uasm_i_dsrl_safe(p, tmp, tmp, PGDIR_SHIFT - 3); | |
e30ec452 TS |
810 | |
811 | uasm_i_andi(p, tmp, tmp, (PTRS_PER_PGD - 1)<<3); | |
812 | uasm_i_daddu(p, ptr, ptr, tmp); /* add in pgd offset */ | |
325f8a0a | 813 | #ifndef __PAGETABLE_PMD_FOLDED |
e30ec452 TS |
814 | uasm_i_dmfc0(p, tmp, C0_BADVADDR); /* get faulting address */ |
815 | uasm_i_ld(p, ptr, 0, ptr); /* get pmd pointer */ | |
3be6022c | 816 | uasm_i_dsrl_safe(p, tmp, tmp, PMD_SHIFT-3); /* get pmd offset in bytes */ |
e30ec452 TS |
817 | uasm_i_andi(p, tmp, tmp, (PTRS_PER_PMD - 1)<<3); |
818 | uasm_i_daddu(p, ptr, ptr, tmp); /* add in pmd offset */ | |
325f8a0a | 819 | #endif |
1da177e4 LT |
820 | } |
821 | ||
822 | /* | |
823 | * BVADDR is the faulting address, PTR is scratch. | |
824 | * PTR will hold the pgd for vmalloc. | |
825 | */ | |
234fcd14 | 826 | static void __cpuinit |
e30ec452 | 827 | build_get_pgd_vmalloc64(u32 **p, struct uasm_label **l, struct uasm_reloc **r, |
1ec56329 DD |
828 | unsigned int bvaddr, unsigned int ptr, |
829 | enum vmalloc64_mode mode) | |
1da177e4 LT |
830 | { |
831 | long swpd = (long)swapper_pg_dir; | |
1ec56329 DD |
832 | int single_insn_swpd; |
833 | int did_vmalloc_branch = 0; | |
834 | ||
835 | single_insn_swpd = uasm_in_compat_space_p(swpd) && !uasm_rel_lo(swpd); | |
1da177e4 | 836 | |
e30ec452 | 837 | uasm_l_vmalloc(l, *p); |
1da177e4 | 838 | |
2c8c53e2 | 839 | if (mode != not_refill && check_for_high_segbits) { |
1ec56329 DD |
840 | if (single_insn_swpd) { |
841 | uasm_il_bltz(p, r, bvaddr, label_vmalloc_done); | |
842 | uasm_i_lui(p, ptr, uasm_rel_hi(swpd)); | |
843 | did_vmalloc_branch = 1; | |
844 | /* fall through */ | |
845 | } else { | |
846 | uasm_il_bgez(p, r, bvaddr, label_large_segbits_fault); | |
847 | } | |
848 | } | |
849 | if (!did_vmalloc_branch) { | |
850 | if (uasm_in_compat_space_p(swpd) && !uasm_rel_lo(swpd)) { | |
851 | uasm_il_b(p, r, label_vmalloc_done); | |
852 | uasm_i_lui(p, ptr, uasm_rel_hi(swpd)); | |
853 | } else { | |
854 | UASM_i_LA_mostly(p, ptr, swpd); | |
855 | uasm_il_b(p, r, label_vmalloc_done); | |
856 | if (uasm_in_compat_space_p(swpd)) | |
857 | uasm_i_addiu(p, ptr, ptr, uasm_rel_lo(swpd)); | |
858 | else | |
859 | uasm_i_daddiu(p, ptr, ptr, uasm_rel_lo(swpd)); | |
860 | } | |
861 | } | |
2c8c53e2 | 862 | if (mode != not_refill && check_for_high_segbits) { |
1ec56329 DD |
863 | uasm_l_large_segbits_fault(l, *p); |
864 | /* | |
865 | * We get here if we are an xsseg address, or if we are | |
866 | * an xuseg address above (PGDIR_SHIFT+PGDIR_BITS) boundary. | |
867 | * | |
868 | * Ignoring xsseg (assume disabled so would generate | |
869 | * (address errors?), the only remaining possibility | |
870 | * is the upper xuseg addresses. On processors with | |
871 | * TLB_SEGBITS <= PGDIR_SHIFT+PGDIR_BITS, these | |
872 | * addresses would have taken an address error. We try | |
873 | * to mimic that here by taking a load/istream page | |
874 | * fault. | |
875 | */ | |
876 | UASM_i_LA(p, ptr, (unsigned long)tlb_do_page_fault_0); | |
877 | uasm_i_jr(p, ptr); | |
2c8c53e2 DD |
878 | |
879 | if (mode == refill_scratch) { | |
880 | if (scratch_reg > 0) | |
881 | UASM_i_MFC0(p, 1, 31, scratch_reg); | |
882 | else | |
883 | UASM_i_LW(p, 1, scratchpad_offset(0), 0); | |
884 | } else { | |
885 | uasm_i_nop(p); | |
886 | } | |
1da177e4 LT |
887 | } |
888 | } | |
889 | ||
875d43e7 | 890 | #else /* !CONFIG_64BIT */ |
1da177e4 LT |
891 | |
892 | /* | |
893 | * TMP and PTR are scratch. | |
894 | * TMP will be clobbered, PTR will hold the pgd entry. | |
895 | */ | |
234fcd14 | 896 | static void __cpuinit __maybe_unused |
1da177e4 LT |
897 | build_get_pgde32(u32 **p, unsigned int tmp, unsigned int ptr) |
898 | { | |
899 | long pgdc = (long)pgd_current; | |
900 | ||
901 | /* 32 bit SMP has smp_processor_id() stored in CONTEXT. */ | |
902 | #ifdef CONFIG_SMP | |
41c594ab RB |
903 | #ifdef CONFIG_MIPS_MT_SMTC |
904 | /* | |
905 | * SMTC uses TCBind value as "CPU" index | |
906 | */ | |
e30ec452 TS |
907 | uasm_i_mfc0(p, ptr, C0_TCBIND); |
908 | UASM_i_LA_mostly(p, tmp, pgdc); | |
909 | uasm_i_srl(p, ptr, ptr, 19); | |
41c594ab RB |
910 | #else |
911 | /* | |
912 | * smp_processor_id() << 3 is stored in CONTEXT. | |
913 | */ | |
e30ec452 TS |
914 | uasm_i_mfc0(p, ptr, C0_CONTEXT); |
915 | UASM_i_LA_mostly(p, tmp, pgdc); | |
916 | uasm_i_srl(p, ptr, ptr, 23); | |
41c594ab | 917 | #endif |
e30ec452 | 918 | uasm_i_addu(p, ptr, tmp, ptr); |
1da177e4 | 919 | #else |
e30ec452 | 920 | UASM_i_LA_mostly(p, ptr, pgdc); |
1da177e4 | 921 | #endif |
e30ec452 TS |
922 | uasm_i_mfc0(p, tmp, C0_BADVADDR); /* get faulting address */ |
923 | uasm_i_lw(p, ptr, uasm_rel_lo(pgdc), ptr); | |
924 | uasm_i_srl(p, tmp, tmp, PGDIR_SHIFT); /* get pgd only bits */ | |
925 | uasm_i_sll(p, tmp, tmp, PGD_T_LOG2); | |
926 | uasm_i_addu(p, ptr, ptr, tmp); /* add in pgd offset */ | |
1da177e4 LT |
927 | } |
928 | ||
875d43e7 | 929 | #endif /* !CONFIG_64BIT */ |
1da177e4 | 930 | |
234fcd14 | 931 | static void __cpuinit build_adjust_context(u32 **p, unsigned int ctx) |
1da177e4 | 932 | { |
242954b5 | 933 | unsigned int shift = 4 - (PTE_T_LOG2 + 1) + PAGE_SHIFT - 12; |
1da177e4 LT |
934 | unsigned int mask = (PTRS_PER_PTE / 2 - 1) << (PTE_T_LOG2 + 1); |
935 | ||
10cc3529 | 936 | switch (current_cpu_type()) { |
1da177e4 LT |
937 | case CPU_VR41XX: |
938 | case CPU_VR4111: | |
939 | case CPU_VR4121: | |
940 | case CPU_VR4122: | |
941 | case CPU_VR4131: | |
942 | case CPU_VR4181: | |
943 | case CPU_VR4181A: | |
944 | case CPU_VR4133: | |
945 | shift += 2; | |
946 | break; | |
947 | ||
948 | default: | |
949 | break; | |
950 | } | |
951 | ||
952 | if (shift) | |
e30ec452 TS |
953 | UASM_i_SRL(p, ctx, ctx, shift); |
954 | uasm_i_andi(p, ctx, ctx, mask); | |
1da177e4 LT |
955 | } |
956 | ||
234fcd14 | 957 | static void __cpuinit build_get_ptep(u32 **p, unsigned int tmp, unsigned int ptr) |
1da177e4 LT |
958 | { |
959 | /* | |
960 | * Bug workaround for the Nevada. It seems as if under certain | |
961 | * circumstances the move from cp0_context might produce a | |
962 | * bogus result when the mfc0 instruction and its consumer are | |
963 | * in a different cacheline or a load instruction, probably any | |
964 | * memory reference, is between them. | |
965 | */ | |
10cc3529 | 966 | switch (current_cpu_type()) { |
1da177e4 | 967 | case CPU_NEVADA: |
e30ec452 | 968 | UASM_i_LW(p, ptr, 0, ptr); |
1da177e4 LT |
969 | GET_CONTEXT(p, tmp); /* get context reg */ |
970 | break; | |
971 | ||
972 | default: | |
973 | GET_CONTEXT(p, tmp); /* get context reg */ | |
e30ec452 | 974 | UASM_i_LW(p, ptr, 0, ptr); |
1da177e4 LT |
975 | break; |
976 | } | |
977 | ||
978 | build_adjust_context(p, tmp); | |
e30ec452 | 979 | UASM_i_ADDU(p, ptr, ptr, tmp); /* add in offset */ |
1da177e4 LT |
980 | } |
981 | ||
234fcd14 | 982 | static void __cpuinit build_update_entries(u32 **p, unsigned int tmp, |
1da177e4 LT |
983 | unsigned int ptep) |
984 | { | |
985 | /* | |
986 | * 64bit address support (36bit on a 32bit CPU) in a 32bit | |
987 | * Kernel is a special case. Only a few CPUs use it. | |
988 | */ | |
989 | #ifdef CONFIG_64BIT_PHYS_ADDR | |
990 | if (cpu_has_64bits) { | |
e30ec452 TS |
991 | uasm_i_ld(p, tmp, 0, ptep); /* get even pte */ |
992 | uasm_i_ld(p, ptep, sizeof(pte_t), ptep); /* get odd pte */ | |
6dd9344c DD |
993 | if (kernel_uses_smartmips_rixi) { |
994 | UASM_i_SRL(p, tmp, tmp, ilog2(_PAGE_NO_EXEC)); | |
995 | UASM_i_SRL(p, ptep, ptep, ilog2(_PAGE_NO_EXEC)); | |
996 | UASM_i_ROTR(p, tmp, tmp, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC)); | |
997 | UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */ | |
998 | UASM_i_ROTR(p, ptep, ptep, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC)); | |
999 | } else { | |
3be6022c | 1000 | uasm_i_dsrl_safe(p, tmp, tmp, ilog2(_PAGE_GLOBAL)); /* convert to entrylo0 */ |
6dd9344c | 1001 | UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */ |
3be6022c | 1002 | uasm_i_dsrl_safe(p, ptep, ptep, ilog2(_PAGE_GLOBAL)); /* convert to entrylo1 */ |
6dd9344c | 1003 | } |
9b8c3891 | 1004 | UASM_i_MTC0(p, ptep, C0_ENTRYLO1); /* load it */ |
1da177e4 LT |
1005 | } else { |
1006 | int pte_off_even = sizeof(pte_t) / 2; | |
1007 | int pte_off_odd = pte_off_even + sizeof(pte_t); | |
1008 | ||
1009 | /* The pte entries are pre-shifted */ | |
e30ec452 | 1010 | uasm_i_lw(p, tmp, pte_off_even, ptep); /* get even pte */ |
9b8c3891 | 1011 | UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */ |
e30ec452 | 1012 | uasm_i_lw(p, ptep, pte_off_odd, ptep); /* get odd pte */ |
9b8c3891 | 1013 | UASM_i_MTC0(p, ptep, C0_ENTRYLO1); /* load it */ |
1da177e4 LT |
1014 | } |
1015 | #else | |
e30ec452 TS |
1016 | UASM_i_LW(p, tmp, 0, ptep); /* get even pte */ |
1017 | UASM_i_LW(p, ptep, sizeof(pte_t), ptep); /* get odd pte */ | |
1da177e4 LT |
1018 | if (r45k_bvahwbug()) |
1019 | build_tlb_probe_entry(p); | |
6dd9344c DD |
1020 | if (kernel_uses_smartmips_rixi) { |
1021 | UASM_i_SRL(p, tmp, tmp, ilog2(_PAGE_NO_EXEC)); | |
1022 | UASM_i_SRL(p, ptep, ptep, ilog2(_PAGE_NO_EXEC)); | |
1023 | UASM_i_ROTR(p, tmp, tmp, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC)); | |
1024 | if (r4k_250MHZhwbug()) | |
1025 | UASM_i_MTC0(p, 0, C0_ENTRYLO0); | |
1026 | UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */ | |
1027 | UASM_i_ROTR(p, ptep, ptep, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC)); | |
1028 | } else { | |
1029 | UASM_i_SRL(p, tmp, tmp, ilog2(_PAGE_GLOBAL)); /* convert to entrylo0 */ | |
1030 | if (r4k_250MHZhwbug()) | |
1031 | UASM_i_MTC0(p, 0, C0_ENTRYLO0); | |
1032 | UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */ | |
1033 | UASM_i_SRL(p, ptep, ptep, ilog2(_PAGE_GLOBAL)); /* convert to entrylo1 */ | |
1034 | if (r45k_bvahwbug()) | |
1035 | uasm_i_mfc0(p, tmp, C0_INDEX); | |
1036 | } | |
1da177e4 | 1037 | if (r4k_250MHZhwbug()) |
9b8c3891 DD |
1038 | UASM_i_MTC0(p, 0, C0_ENTRYLO1); |
1039 | UASM_i_MTC0(p, ptep, C0_ENTRYLO1); /* load it */ | |
1da177e4 LT |
1040 | #endif |
1041 | } | |
1042 | ||
2c8c53e2 DD |
1043 | struct mips_huge_tlb_info { |
1044 | int huge_pte; | |
1045 | int restore_scratch; | |
1046 | }; | |
1047 | ||
1048 | static struct mips_huge_tlb_info __cpuinit | |
1049 | build_fast_tlb_refill_handler (u32 **p, struct uasm_label **l, | |
1050 | struct uasm_reloc **r, unsigned int tmp, | |
1051 | unsigned int ptr, int c0_scratch) | |
1052 | { | |
1053 | struct mips_huge_tlb_info rv; | |
1054 | unsigned int even, odd; | |
1055 | int vmalloc_branch_delay_filled = 0; | |
1056 | const int scratch = 1; /* Our extra working register */ | |
1057 | ||
1058 | rv.huge_pte = scratch; | |
1059 | rv.restore_scratch = 0; | |
1060 | ||
1061 | if (check_for_high_segbits) { | |
1062 | UASM_i_MFC0(p, tmp, C0_BADVADDR); | |
1063 | ||
1064 | if (pgd_reg != -1) | |
1065 | UASM_i_MFC0(p, ptr, 31, pgd_reg); | |
1066 | else | |
1067 | UASM_i_MFC0(p, ptr, C0_CONTEXT); | |
1068 | ||
1069 | if (c0_scratch >= 0) | |
1070 | UASM_i_MTC0(p, scratch, 31, c0_scratch); | |
1071 | else | |
1072 | UASM_i_SW(p, scratch, scratchpad_offset(0), 0); | |
1073 | ||
1074 | uasm_i_dsrl_safe(p, scratch, tmp, | |
1075 | PGDIR_SHIFT + PGD_ORDER + PAGE_SHIFT - 3); | |
1076 | uasm_il_bnez(p, r, scratch, label_vmalloc); | |
1077 | ||
1078 | if (pgd_reg == -1) { | |
1079 | vmalloc_branch_delay_filled = 1; | |
1080 | /* Clear lower 23 bits of context. */ | |
1081 | uasm_i_dins(p, ptr, 0, 0, 23); | |
1082 | } | |
1083 | } else { | |
1084 | if (pgd_reg != -1) | |
1085 | UASM_i_MFC0(p, ptr, 31, pgd_reg); | |
1086 | else | |
1087 | UASM_i_MFC0(p, ptr, C0_CONTEXT); | |
1088 | ||
1089 | UASM_i_MFC0(p, tmp, C0_BADVADDR); | |
1090 | ||
1091 | if (c0_scratch >= 0) | |
1092 | UASM_i_MTC0(p, scratch, 31, c0_scratch); | |
1093 | else | |
1094 | UASM_i_SW(p, scratch, scratchpad_offset(0), 0); | |
1095 | ||
1096 | if (pgd_reg == -1) | |
1097 | /* Clear lower 23 bits of context. */ | |
1098 | uasm_i_dins(p, ptr, 0, 0, 23); | |
1099 | ||
1100 | uasm_il_bltz(p, r, tmp, label_vmalloc); | |
1101 | } | |
1102 | ||
1103 | if (pgd_reg == -1) { | |
1104 | vmalloc_branch_delay_filled = 1; | |
1105 | /* 1 0 1 0 1 << 6 xkphys cached */ | |
1106 | uasm_i_ori(p, ptr, ptr, 0x540); | |
1107 | uasm_i_drotr(p, ptr, ptr, 11); | |
1108 | } | |
1109 | ||
1110 | #ifdef __PAGETABLE_PMD_FOLDED | |
1111 | #define LOC_PTEP scratch | |
1112 | #else | |
1113 | #define LOC_PTEP ptr | |
1114 | #endif | |
1115 | ||
1116 | if (!vmalloc_branch_delay_filled) | |
1117 | /* get pgd offset in bytes */ | |
1118 | uasm_i_dsrl_safe(p, scratch, tmp, PGDIR_SHIFT - 3); | |
1119 | ||
1120 | uasm_l_vmalloc_done(l, *p); | |
1121 | ||
1122 | /* | |
1123 | * tmp ptr | |
1124 | * fall-through case = badvaddr *pgd_current | |
1125 | * vmalloc case = badvaddr swapper_pg_dir | |
1126 | */ | |
1127 | ||
1128 | if (vmalloc_branch_delay_filled) | |
1129 | /* get pgd offset in bytes */ | |
1130 | uasm_i_dsrl_safe(p, scratch, tmp, PGDIR_SHIFT - 3); | |
1131 | ||
1132 | #ifdef __PAGETABLE_PMD_FOLDED | |
1133 | GET_CONTEXT(p, tmp); /* get context reg */ | |
1134 | #endif | |
1135 | uasm_i_andi(p, scratch, scratch, (PTRS_PER_PGD - 1) << 3); | |
1136 | ||
1137 | if (use_lwx_insns()) { | |
1138 | UASM_i_LWX(p, LOC_PTEP, scratch, ptr); | |
1139 | } else { | |
1140 | uasm_i_daddu(p, ptr, ptr, scratch); /* add in pgd offset */ | |
1141 | uasm_i_ld(p, LOC_PTEP, 0, ptr); /* get pmd pointer */ | |
1142 | } | |
1143 | ||
1144 | #ifndef __PAGETABLE_PMD_FOLDED | |
1145 | /* get pmd offset in bytes */ | |
1146 | uasm_i_dsrl_safe(p, scratch, tmp, PMD_SHIFT - 3); | |
1147 | uasm_i_andi(p, scratch, scratch, (PTRS_PER_PMD - 1) << 3); | |
1148 | GET_CONTEXT(p, tmp); /* get context reg */ | |
1149 | ||
1150 | if (use_lwx_insns()) { | |
1151 | UASM_i_LWX(p, scratch, scratch, ptr); | |
1152 | } else { | |
1153 | uasm_i_daddu(p, ptr, ptr, scratch); /* add in pmd offset */ | |
1154 | UASM_i_LW(p, scratch, 0, ptr); | |
1155 | } | |
1156 | #endif | |
1157 | /* Adjust the context during the load latency. */ | |
1158 | build_adjust_context(p, tmp); | |
1159 | ||
1160 | #ifdef CONFIG_HUGETLB_PAGE | |
1161 | uasm_il_bbit1(p, r, scratch, ilog2(_PAGE_HUGE), label_tlb_huge_update); | |
1162 | /* | |
1163 | * The in the LWX case we don't want to do the load in the | |
1164 | * delay slot. It cannot issue in the same cycle and may be | |
1165 | * speculative and unneeded. | |
1166 | */ | |
1167 | if (use_lwx_insns()) | |
1168 | uasm_i_nop(p); | |
1169 | #endif /* CONFIG_HUGETLB_PAGE */ | |
1170 | ||
1171 | ||
1172 | /* build_update_entries */ | |
1173 | if (use_lwx_insns()) { | |
1174 | even = ptr; | |
1175 | odd = tmp; | |
1176 | UASM_i_LWX(p, even, scratch, tmp); | |
1177 | UASM_i_ADDIU(p, tmp, tmp, sizeof(pte_t)); | |
1178 | UASM_i_LWX(p, odd, scratch, tmp); | |
1179 | } else { | |
1180 | UASM_i_ADDU(p, ptr, scratch, tmp); /* add in offset */ | |
1181 | even = tmp; | |
1182 | odd = ptr; | |
1183 | UASM_i_LW(p, even, 0, ptr); /* get even pte */ | |
1184 | UASM_i_LW(p, odd, sizeof(pte_t), ptr); /* get odd pte */ | |
1185 | } | |
1186 | if (kernel_uses_smartmips_rixi) { | |
1187 | uasm_i_dsrl_safe(p, even, even, ilog2(_PAGE_NO_EXEC)); | |
1188 | uasm_i_dsrl_safe(p, odd, odd, ilog2(_PAGE_NO_EXEC)); | |
1189 | uasm_i_drotr(p, even, even, | |
1190 | ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC)); | |
1191 | UASM_i_MTC0(p, even, C0_ENTRYLO0); /* load it */ | |
1192 | uasm_i_drotr(p, odd, odd, | |
1193 | ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC)); | |
1194 | } else { | |
1195 | uasm_i_dsrl_safe(p, even, even, ilog2(_PAGE_GLOBAL)); | |
1196 | UASM_i_MTC0(p, even, C0_ENTRYLO0); /* load it */ | |
1197 | uasm_i_dsrl_safe(p, odd, odd, ilog2(_PAGE_GLOBAL)); | |
1198 | } | |
1199 | UASM_i_MTC0(p, odd, C0_ENTRYLO1); /* load it */ | |
1200 | ||
1201 | if (c0_scratch >= 0) { | |
1202 | UASM_i_MFC0(p, scratch, 31, c0_scratch); | |
1203 | build_tlb_write_entry(p, l, r, tlb_random); | |
1204 | uasm_l_leave(l, *p); | |
1205 | rv.restore_scratch = 1; | |
1206 | } else if (PAGE_SHIFT == 14 || PAGE_SHIFT == 13) { | |
1207 | build_tlb_write_entry(p, l, r, tlb_random); | |
1208 | uasm_l_leave(l, *p); | |
1209 | UASM_i_LW(p, scratch, scratchpad_offset(0), 0); | |
1210 | } else { | |
1211 | UASM_i_LW(p, scratch, scratchpad_offset(0), 0); | |
1212 | build_tlb_write_entry(p, l, r, tlb_random); | |
1213 | uasm_l_leave(l, *p); | |
1214 | rv.restore_scratch = 1; | |
1215 | } | |
1216 | ||
1217 | uasm_i_eret(p); /* return from trap */ | |
1218 | ||
1219 | return rv; | |
1220 | } | |
1221 | ||
e6f72d3a DD |
1222 | /* |
1223 | * For a 64-bit kernel, we are using the 64-bit XTLB refill exception | |
1224 | * because EXL == 0. If we wrap, we can also use the 32 instruction | |
1225 | * slots before the XTLB refill exception handler which belong to the | |
1226 | * unused TLB refill exception. | |
1227 | */ | |
1228 | #define MIPS64_REFILL_INSNS 32 | |
1229 | ||
234fcd14 | 1230 | static void __cpuinit build_r4000_tlb_refill_handler(void) |
1da177e4 LT |
1231 | { |
1232 | u32 *p = tlb_handler; | |
e30ec452 TS |
1233 | struct uasm_label *l = labels; |
1234 | struct uasm_reloc *r = relocs; | |
1da177e4 LT |
1235 | u32 *f; |
1236 | unsigned int final_len; | |
4a9040f4 RB |
1237 | struct mips_huge_tlb_info htlb_info __maybe_unused; |
1238 | enum vmalloc64_mode vmalloc_mode __maybe_unused; | |
1da177e4 LT |
1239 | |
1240 | memset(tlb_handler, 0, sizeof(tlb_handler)); | |
1241 | memset(labels, 0, sizeof(labels)); | |
1242 | memset(relocs, 0, sizeof(relocs)); | |
1243 | memset(final_handler, 0, sizeof(final_handler)); | |
1244 | ||
2c8c53e2 DD |
1245 | if ((scratch_reg > 0 || scratchpad_available()) && use_bbit_insns()) { |
1246 | htlb_info = build_fast_tlb_refill_handler(&p, &l, &r, K0, K1, | |
1247 | scratch_reg); | |
1248 | vmalloc_mode = refill_scratch; | |
1249 | } else { | |
1250 | htlb_info.huge_pte = K0; | |
1251 | htlb_info.restore_scratch = 0; | |
1252 | vmalloc_mode = refill_noscratch; | |
1253 | /* | |
1254 | * create the plain linear handler | |
1255 | */ | |
1256 | if (bcm1250_m3_war()) { | |
1257 | unsigned int segbits = 44; | |
1258 | ||
1259 | uasm_i_dmfc0(&p, K0, C0_BADVADDR); | |
1260 | uasm_i_dmfc0(&p, K1, C0_ENTRYHI); | |
1261 | uasm_i_xor(&p, K0, K0, K1); | |
1262 | uasm_i_dsrl_safe(&p, K1, K0, 62); | |
1263 | uasm_i_dsrl_safe(&p, K0, K0, 12 + 1); | |
1264 | uasm_i_dsll_safe(&p, K0, K0, 64 + 12 + 1 - segbits); | |
1265 | uasm_i_or(&p, K0, K0, K1); | |
1266 | uasm_il_bnez(&p, &r, K0, label_leave); | |
1267 | /* No need for uasm_i_nop */ | |
1268 | } | |
1da177e4 | 1269 | |
875d43e7 | 1270 | #ifdef CONFIG_64BIT |
2c8c53e2 | 1271 | build_get_pmde64(&p, &l, &r, K0, K1); /* get pmd in K1 */ |
1da177e4 | 1272 | #else |
2c8c53e2 | 1273 | build_get_pgde32(&p, K0, K1); /* get pgd in K1 */ |
1da177e4 LT |
1274 | #endif |
1275 | ||
fd062c84 | 1276 | #ifdef CONFIG_HUGETLB_PAGE |
2c8c53e2 | 1277 | build_is_huge_pte(&p, &r, K0, K1, label_tlb_huge_update); |
fd062c84 DD |
1278 | #endif |
1279 | ||
2c8c53e2 DD |
1280 | build_get_ptep(&p, K0, K1); |
1281 | build_update_entries(&p, K0, K1); | |
1282 | build_tlb_write_entry(&p, &l, &r, tlb_random); | |
1283 | uasm_l_leave(&l, p); | |
1284 | uasm_i_eret(&p); /* return from trap */ | |
1285 | } | |
fd062c84 DD |
1286 | #ifdef CONFIG_HUGETLB_PAGE |
1287 | uasm_l_tlb_huge_update(&l, p); | |
2c8c53e2 DD |
1288 | build_huge_update_entries(&p, htlb_info.huge_pte, K1); |
1289 | build_huge_tlb_write_entry(&p, &l, &r, K0, tlb_random, | |
1290 | htlb_info.restore_scratch); | |
fd062c84 DD |
1291 | #endif |
1292 | ||
875d43e7 | 1293 | #ifdef CONFIG_64BIT |
2c8c53e2 | 1294 | build_get_pgd_vmalloc64(&p, &l, &r, K0, K1, vmalloc_mode); |
1da177e4 LT |
1295 | #endif |
1296 | ||
1297 | /* | |
1298 | * Overflow check: For the 64bit handler, we need at least one | |
1299 | * free instruction slot for the wrap-around branch. In worst | |
1300 | * case, if the intended insertion point is a delay slot, we | |
4b3f686d | 1301 | * need three, with the second nop'ed and the third being |
1da177e4 LT |
1302 | * unused. |
1303 | */ | |
2a21c730 FZ |
1304 | /* Loongson2 ebase is different than r4k, we have more space */ |
1305 | #if defined(CONFIG_32BIT) || defined(CONFIG_CPU_LOONGSON2) | |
1da177e4 LT |
1306 | if ((p - tlb_handler) > 64) |
1307 | panic("TLB refill handler space exceeded"); | |
1308 | #else | |
e6f72d3a DD |
1309 | if (((p - tlb_handler) > (MIPS64_REFILL_INSNS * 2) - 1) |
1310 | || (((p - tlb_handler) > (MIPS64_REFILL_INSNS * 2) - 3) | |
1311 | && uasm_insn_has_bdelay(relocs, | |
1312 | tlb_handler + MIPS64_REFILL_INSNS - 3))) | |
1da177e4 LT |
1313 | panic("TLB refill handler space exceeded"); |
1314 | #endif | |
1315 | ||
1316 | /* | |
1317 | * Now fold the handler in the TLB refill handler space. | |
1318 | */ | |
2a21c730 | 1319 | #if defined(CONFIG_32BIT) || defined(CONFIG_CPU_LOONGSON2) |
1da177e4 LT |
1320 | f = final_handler; |
1321 | /* Simplest case, just copy the handler. */ | |
e30ec452 | 1322 | uasm_copy_handler(relocs, labels, tlb_handler, p, f); |
1da177e4 | 1323 | final_len = p - tlb_handler; |
875d43e7 | 1324 | #else /* CONFIG_64BIT */ |
e6f72d3a DD |
1325 | f = final_handler + MIPS64_REFILL_INSNS; |
1326 | if ((p - tlb_handler) <= MIPS64_REFILL_INSNS) { | |
1da177e4 | 1327 | /* Just copy the handler. */ |
e30ec452 | 1328 | uasm_copy_handler(relocs, labels, tlb_handler, p, f); |
1da177e4 LT |
1329 | final_len = p - tlb_handler; |
1330 | } else { | |
fd062c84 DD |
1331 | #if defined(CONFIG_HUGETLB_PAGE) |
1332 | const enum label_id ls = label_tlb_huge_update; | |
95affdda DD |
1333 | #else |
1334 | const enum label_id ls = label_vmalloc; | |
1335 | #endif | |
1336 | u32 *split; | |
1337 | int ov = 0; | |
1338 | int i; | |
1339 | ||
1340 | for (i = 0; i < ARRAY_SIZE(labels) && labels[i].lab != ls; i++) | |
1341 | ; | |
1342 | BUG_ON(i == ARRAY_SIZE(labels)); | |
1343 | split = labels[i].addr; | |
1da177e4 LT |
1344 | |
1345 | /* | |
95affdda | 1346 | * See if we have overflown one way or the other. |
1da177e4 | 1347 | */ |
95affdda DD |
1348 | if (split > tlb_handler + MIPS64_REFILL_INSNS || |
1349 | split < p - MIPS64_REFILL_INSNS) | |
1350 | ov = 1; | |
1351 | ||
1352 | if (ov) { | |
1353 | /* | |
1354 | * Split two instructions before the end. One | |
1355 | * for the branch and one for the instruction | |
1356 | * in the delay slot. | |
1357 | */ | |
1358 | split = tlb_handler + MIPS64_REFILL_INSNS - 2; | |
1359 | ||
1360 | /* | |
1361 | * If the branch would fall in a delay slot, | |
1362 | * we must back up an additional instruction | |
1363 | * so that it is no longer in a delay slot. | |
1364 | */ | |
1365 | if (uasm_insn_has_bdelay(relocs, split - 1)) | |
1366 | split--; | |
1367 | } | |
1da177e4 | 1368 | /* Copy first part of the handler. */ |
e30ec452 | 1369 | uasm_copy_handler(relocs, labels, tlb_handler, split, f); |
1da177e4 LT |
1370 | f += split - tlb_handler; |
1371 | ||
95affdda DD |
1372 | if (ov) { |
1373 | /* Insert branch. */ | |
1374 | uasm_l_split(&l, final_handler); | |
1375 | uasm_il_b(&f, &r, label_split); | |
1376 | if (uasm_insn_has_bdelay(relocs, split)) | |
1377 | uasm_i_nop(&f); | |
1378 | else { | |
1379 | uasm_copy_handler(relocs, labels, | |
1380 | split, split + 1, f); | |
1381 | uasm_move_labels(labels, f, f + 1, -1); | |
1382 | f++; | |
1383 | split++; | |
1384 | } | |
1da177e4 LT |
1385 | } |
1386 | ||
1387 | /* Copy the rest of the handler. */ | |
e30ec452 | 1388 | uasm_copy_handler(relocs, labels, split, p, final_handler); |
e6f72d3a DD |
1389 | final_len = (f - (final_handler + MIPS64_REFILL_INSNS)) + |
1390 | (p - split); | |
1da177e4 | 1391 | } |
875d43e7 | 1392 | #endif /* CONFIG_64BIT */ |
1da177e4 | 1393 | |
e30ec452 TS |
1394 | uasm_resolve_relocs(relocs, labels); |
1395 | pr_debug("Wrote TLB refill handler (%u instructions).\n", | |
1396 | final_len); | |
1da177e4 | 1397 | |
91b05e67 | 1398 | memcpy((void *)ebase, final_handler, 0x100); |
92b1e6a6 FBH |
1399 | |
1400 | dump_handler((u32 *)ebase, 64); | |
1da177e4 LT |
1401 | } |
1402 | ||
1da177e4 LT |
1403 | /* |
1404 | * 128 instructions for the fastpath handler is generous and should | |
1405 | * never be exceeded. | |
1406 | */ | |
1407 | #define FASTPATH_SIZE 128 | |
1408 | ||
cbdbe07f FBH |
1409 | u32 handle_tlbl[FASTPATH_SIZE] __cacheline_aligned; |
1410 | u32 handle_tlbs[FASTPATH_SIZE] __cacheline_aligned; | |
1411 | u32 handle_tlbm[FASTPATH_SIZE] __cacheline_aligned; | |
3d8bfdd0 DD |
1412 | #ifdef CONFIG_MIPS_PGD_C0_CONTEXT |
1413 | u32 tlbmiss_handler_setup_pgd[16] __cacheline_aligned; | |
1414 | ||
1415 | static void __cpuinit build_r4000_setup_pgd(void) | |
1416 | { | |
1417 | const int a0 = 4; | |
1418 | const int a1 = 5; | |
1419 | u32 *p = tlbmiss_handler_setup_pgd; | |
1420 | struct uasm_label *l = labels; | |
1421 | struct uasm_reloc *r = relocs; | |
1422 | ||
1423 | memset(tlbmiss_handler_setup_pgd, 0, sizeof(tlbmiss_handler_setup_pgd)); | |
1424 | memset(labels, 0, sizeof(labels)); | |
1425 | memset(relocs, 0, sizeof(relocs)); | |
1426 | ||
1427 | pgd_reg = allocate_kscratch(); | |
1428 | ||
1429 | if (pgd_reg == -1) { | |
1430 | /* PGD << 11 in c0_Context */ | |
1431 | /* | |
1432 | * If it is a ckseg0 address, convert to a physical | |
1433 | * address. Shifting right by 29 and adding 4 will | |
1434 | * result in zero for these addresses. | |
1435 | * | |
1436 | */ | |
1437 | UASM_i_SRA(&p, a1, a0, 29); | |
1438 | UASM_i_ADDIU(&p, a1, a1, 4); | |
1439 | uasm_il_bnez(&p, &r, a1, label_tlbl_goaround1); | |
1440 | uasm_i_nop(&p); | |
1441 | uasm_i_dinsm(&p, a0, 0, 29, 64 - 29); | |
1442 | uasm_l_tlbl_goaround1(&l, p); | |
1443 | UASM_i_SLL(&p, a0, a0, 11); | |
1444 | uasm_i_jr(&p, 31); | |
1445 | UASM_i_MTC0(&p, a0, C0_CONTEXT); | |
1446 | } else { | |
1447 | /* PGD in c0_KScratch */ | |
1448 | uasm_i_jr(&p, 31); | |
1449 | UASM_i_MTC0(&p, a0, 31, pgd_reg); | |
1450 | } | |
1451 | if (p - tlbmiss_handler_setup_pgd > ARRAY_SIZE(tlbmiss_handler_setup_pgd)) | |
1452 | panic("tlbmiss_handler_setup_pgd space exceeded"); | |
1453 | uasm_resolve_relocs(relocs, labels); | |
1454 | pr_debug("Wrote tlbmiss_handler_setup_pgd (%u instructions).\n", | |
1455 | (unsigned int)(p - tlbmiss_handler_setup_pgd)); | |
1456 | ||
1457 | dump_handler(tlbmiss_handler_setup_pgd, | |
1458 | ARRAY_SIZE(tlbmiss_handler_setup_pgd)); | |
1459 | } | |
1460 | #endif | |
1da177e4 | 1461 | |
234fcd14 | 1462 | static void __cpuinit |
bd1437e4 | 1463 | iPTE_LW(u32 **p, unsigned int pte, unsigned int ptr) |
1da177e4 LT |
1464 | { |
1465 | #ifdef CONFIG_SMP | |
1466 | # ifdef CONFIG_64BIT_PHYS_ADDR | |
1467 | if (cpu_has_64bits) | |
e30ec452 | 1468 | uasm_i_lld(p, pte, 0, ptr); |
1da177e4 LT |
1469 | else |
1470 | # endif | |
e30ec452 | 1471 | UASM_i_LL(p, pte, 0, ptr); |
1da177e4 LT |
1472 | #else |
1473 | # ifdef CONFIG_64BIT_PHYS_ADDR | |
1474 | if (cpu_has_64bits) | |
e30ec452 | 1475 | uasm_i_ld(p, pte, 0, ptr); |
1da177e4 LT |
1476 | else |
1477 | # endif | |
e30ec452 | 1478 | UASM_i_LW(p, pte, 0, ptr); |
1da177e4 LT |
1479 | #endif |
1480 | } | |
1481 | ||
234fcd14 | 1482 | static void __cpuinit |
e30ec452 | 1483 | iPTE_SW(u32 **p, struct uasm_reloc **r, unsigned int pte, unsigned int ptr, |
63b2d2f4 | 1484 | unsigned int mode) |
1da177e4 | 1485 | { |
63b2d2f4 TS |
1486 | #ifdef CONFIG_64BIT_PHYS_ADDR |
1487 | unsigned int hwmode = mode & (_PAGE_VALID | _PAGE_DIRTY); | |
1488 | #endif | |
1489 | ||
e30ec452 | 1490 | uasm_i_ori(p, pte, pte, mode); |
1da177e4 LT |
1491 | #ifdef CONFIG_SMP |
1492 | # ifdef CONFIG_64BIT_PHYS_ADDR | |
1493 | if (cpu_has_64bits) | |
e30ec452 | 1494 | uasm_i_scd(p, pte, 0, ptr); |
1da177e4 LT |
1495 | else |
1496 | # endif | |
e30ec452 | 1497 | UASM_i_SC(p, pte, 0, ptr); |
1da177e4 LT |
1498 | |
1499 | if (r10000_llsc_war()) | |
e30ec452 | 1500 | uasm_il_beqzl(p, r, pte, label_smp_pgtable_change); |
1da177e4 | 1501 | else |
e30ec452 | 1502 | uasm_il_beqz(p, r, pte, label_smp_pgtable_change); |
1da177e4 LT |
1503 | |
1504 | # ifdef CONFIG_64BIT_PHYS_ADDR | |
1505 | if (!cpu_has_64bits) { | |
e30ec452 TS |
1506 | /* no uasm_i_nop needed */ |
1507 | uasm_i_ll(p, pte, sizeof(pte_t) / 2, ptr); | |
1508 | uasm_i_ori(p, pte, pte, hwmode); | |
1509 | uasm_i_sc(p, pte, sizeof(pte_t) / 2, ptr); | |
1510 | uasm_il_beqz(p, r, pte, label_smp_pgtable_change); | |
1511 | /* no uasm_i_nop needed */ | |
1512 | uasm_i_lw(p, pte, 0, ptr); | |
1da177e4 | 1513 | } else |
e30ec452 | 1514 | uasm_i_nop(p); |
1da177e4 | 1515 | # else |
e30ec452 | 1516 | uasm_i_nop(p); |
1da177e4 LT |
1517 | # endif |
1518 | #else | |
1519 | # ifdef CONFIG_64BIT_PHYS_ADDR | |
1520 | if (cpu_has_64bits) | |
e30ec452 | 1521 | uasm_i_sd(p, pte, 0, ptr); |
1da177e4 LT |
1522 | else |
1523 | # endif | |
e30ec452 | 1524 | UASM_i_SW(p, pte, 0, ptr); |
1da177e4 LT |
1525 | |
1526 | # ifdef CONFIG_64BIT_PHYS_ADDR | |
1527 | if (!cpu_has_64bits) { | |
e30ec452 TS |
1528 | uasm_i_lw(p, pte, sizeof(pte_t) / 2, ptr); |
1529 | uasm_i_ori(p, pte, pte, hwmode); | |
1530 | uasm_i_sw(p, pte, sizeof(pte_t) / 2, ptr); | |
1531 | uasm_i_lw(p, pte, 0, ptr); | |
1da177e4 LT |
1532 | } |
1533 | # endif | |
1534 | #endif | |
1535 | } | |
1536 | ||
1537 | /* | |
1538 | * Check if PTE is present, if not then jump to LABEL. PTR points to | |
1539 | * the page table where this PTE is located, PTE will be re-loaded | |
1540 | * with it's original value. | |
1541 | */ | |
234fcd14 | 1542 | static void __cpuinit |
bd1437e4 | 1543 | build_pte_present(u32 **p, struct uasm_reloc **r, |
bf28607f | 1544 | int pte, int ptr, int scratch, enum label_id lid) |
1da177e4 | 1545 | { |
bf28607f DD |
1546 | int t = scratch >= 0 ? scratch : pte; |
1547 | ||
6dd9344c | 1548 | if (kernel_uses_smartmips_rixi) { |
cc33ae43 DD |
1549 | if (use_bbit_insns()) { |
1550 | uasm_il_bbit0(p, r, pte, ilog2(_PAGE_PRESENT), lid); | |
1551 | uasm_i_nop(p); | |
1552 | } else { | |
bf28607f DD |
1553 | uasm_i_andi(p, t, pte, _PAGE_PRESENT); |
1554 | uasm_il_beqz(p, r, t, lid); | |
1555 | if (pte == t) | |
1556 | /* You lose the SMP race :-(*/ | |
1557 | iPTE_LW(p, pte, ptr); | |
cc33ae43 | 1558 | } |
6dd9344c | 1559 | } else { |
bf28607f DD |
1560 | uasm_i_andi(p, t, pte, _PAGE_PRESENT | _PAGE_READ); |
1561 | uasm_i_xori(p, t, t, _PAGE_PRESENT | _PAGE_READ); | |
1562 | uasm_il_bnez(p, r, t, lid); | |
1563 | if (pte == t) | |
1564 | /* You lose the SMP race :-(*/ | |
1565 | iPTE_LW(p, pte, ptr); | |
6dd9344c | 1566 | } |
1da177e4 LT |
1567 | } |
1568 | ||
1569 | /* Make PTE valid, store result in PTR. */ | |
234fcd14 | 1570 | static void __cpuinit |
e30ec452 | 1571 | build_make_valid(u32 **p, struct uasm_reloc **r, unsigned int pte, |
1da177e4 LT |
1572 | unsigned int ptr) |
1573 | { | |
63b2d2f4 TS |
1574 | unsigned int mode = _PAGE_VALID | _PAGE_ACCESSED; |
1575 | ||
1576 | iPTE_SW(p, r, pte, ptr, mode); | |
1da177e4 LT |
1577 | } |
1578 | ||
1579 | /* | |
1580 | * Check if PTE can be written to, if not branch to LABEL. Regardless | |
1581 | * restore PTE with value from PTR when done. | |
1582 | */ | |
234fcd14 | 1583 | static void __cpuinit |
bd1437e4 | 1584 | build_pte_writable(u32 **p, struct uasm_reloc **r, |
bf28607f DD |
1585 | unsigned int pte, unsigned int ptr, int scratch, |
1586 | enum label_id lid) | |
1da177e4 | 1587 | { |
bf28607f DD |
1588 | int t = scratch >= 0 ? scratch : pte; |
1589 | ||
1590 | uasm_i_andi(p, t, pte, _PAGE_PRESENT | _PAGE_WRITE); | |
1591 | uasm_i_xori(p, t, t, _PAGE_PRESENT | _PAGE_WRITE); | |
1592 | uasm_il_bnez(p, r, t, lid); | |
1593 | if (pte == t) | |
1594 | /* You lose the SMP race :-(*/ | |
cc33ae43 | 1595 | iPTE_LW(p, pte, ptr); |
bf28607f DD |
1596 | else |
1597 | uasm_i_nop(p); | |
1da177e4 LT |
1598 | } |
1599 | ||
1600 | /* Make PTE writable, update software status bits as well, then store | |
1601 | * at PTR. | |
1602 | */ | |
234fcd14 | 1603 | static void __cpuinit |
e30ec452 | 1604 | build_make_write(u32 **p, struct uasm_reloc **r, unsigned int pte, |
1da177e4 LT |
1605 | unsigned int ptr) |
1606 | { | |
63b2d2f4 TS |
1607 | unsigned int mode = (_PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID |
1608 | | _PAGE_DIRTY); | |
1609 | ||
1610 | iPTE_SW(p, r, pte, ptr, mode); | |
1da177e4 LT |
1611 | } |
1612 | ||
1613 | /* | |
1614 | * Check if PTE can be modified, if not branch to LABEL. Regardless | |
1615 | * restore PTE with value from PTR when done. | |
1616 | */ | |
234fcd14 | 1617 | static void __cpuinit |
bd1437e4 | 1618 | build_pte_modifiable(u32 **p, struct uasm_reloc **r, |
bf28607f DD |
1619 | unsigned int pte, unsigned int ptr, int scratch, |
1620 | enum label_id lid) | |
1da177e4 | 1621 | { |
cc33ae43 DD |
1622 | if (use_bbit_insns()) { |
1623 | uasm_il_bbit0(p, r, pte, ilog2(_PAGE_WRITE), lid); | |
1624 | uasm_i_nop(p); | |
1625 | } else { | |
bf28607f DD |
1626 | int t = scratch >= 0 ? scratch : pte; |
1627 | uasm_i_andi(p, t, pte, _PAGE_WRITE); | |
1628 | uasm_il_beqz(p, r, t, lid); | |
1629 | if (pte == t) | |
1630 | /* You lose the SMP race :-(*/ | |
1631 | iPTE_LW(p, pte, ptr); | |
cc33ae43 | 1632 | } |
1da177e4 LT |
1633 | } |
1634 | ||
82622284 | 1635 | #ifndef CONFIG_MIPS_PGD_C0_CONTEXT |
3d8bfdd0 DD |
1636 | |
1637 | ||
1da177e4 LT |
1638 | /* |
1639 | * R3000 style TLB load/store/modify handlers. | |
1640 | */ | |
1641 | ||
fded2e50 MR |
1642 | /* |
1643 | * This places the pte into ENTRYLO0 and writes it with tlbwi. | |
1644 | * Then it returns. | |
1645 | */ | |
234fcd14 | 1646 | static void __cpuinit |
fded2e50 | 1647 | build_r3000_pte_reload_tlbwi(u32 **p, unsigned int pte, unsigned int tmp) |
1da177e4 | 1648 | { |
e30ec452 TS |
1649 | uasm_i_mtc0(p, pte, C0_ENTRYLO0); /* cp0 delay */ |
1650 | uasm_i_mfc0(p, tmp, C0_EPC); /* cp0 delay */ | |
1651 | uasm_i_tlbwi(p); | |
1652 | uasm_i_jr(p, tmp); | |
1653 | uasm_i_rfe(p); /* branch delay */ | |
1da177e4 LT |
1654 | } |
1655 | ||
1656 | /* | |
fded2e50 MR |
1657 | * This places the pte into ENTRYLO0 and writes it with tlbwi |
1658 | * or tlbwr as appropriate. This is because the index register | |
1659 | * may have the probe fail bit set as a result of a trap on a | |
1660 | * kseg2 access, i.e. without refill. Then it returns. | |
1da177e4 | 1661 | */ |
234fcd14 | 1662 | static void __cpuinit |
e30ec452 TS |
1663 | build_r3000_tlb_reload_write(u32 **p, struct uasm_label **l, |
1664 | struct uasm_reloc **r, unsigned int pte, | |
1665 | unsigned int tmp) | |
1666 | { | |
1667 | uasm_i_mfc0(p, tmp, C0_INDEX); | |
1668 | uasm_i_mtc0(p, pte, C0_ENTRYLO0); /* cp0 delay */ | |
1669 | uasm_il_bltz(p, r, tmp, label_r3000_write_probe_fail); /* cp0 delay */ | |
1670 | uasm_i_mfc0(p, tmp, C0_EPC); /* branch delay */ | |
1671 | uasm_i_tlbwi(p); /* cp0 delay */ | |
1672 | uasm_i_jr(p, tmp); | |
1673 | uasm_i_rfe(p); /* branch delay */ | |
1674 | uasm_l_r3000_write_probe_fail(l, *p); | |
1675 | uasm_i_tlbwr(p); /* cp0 delay */ | |
1676 | uasm_i_jr(p, tmp); | |
1677 | uasm_i_rfe(p); /* branch delay */ | |
1da177e4 LT |
1678 | } |
1679 | ||
234fcd14 | 1680 | static void __cpuinit |
1da177e4 LT |
1681 | build_r3000_tlbchange_handler_head(u32 **p, unsigned int pte, |
1682 | unsigned int ptr) | |
1683 | { | |
1684 | long pgdc = (long)pgd_current; | |
1685 | ||
e30ec452 TS |
1686 | uasm_i_mfc0(p, pte, C0_BADVADDR); |
1687 | uasm_i_lui(p, ptr, uasm_rel_hi(pgdc)); /* cp0 delay */ | |
1688 | uasm_i_lw(p, ptr, uasm_rel_lo(pgdc), ptr); | |
1689 | uasm_i_srl(p, pte, pte, 22); /* load delay */ | |
1690 | uasm_i_sll(p, pte, pte, 2); | |
1691 | uasm_i_addu(p, ptr, ptr, pte); | |
1692 | uasm_i_mfc0(p, pte, C0_CONTEXT); | |
1693 | uasm_i_lw(p, ptr, 0, ptr); /* cp0 delay */ | |
1694 | uasm_i_andi(p, pte, pte, 0xffc); /* load delay */ | |
1695 | uasm_i_addu(p, ptr, ptr, pte); | |
1696 | uasm_i_lw(p, pte, 0, ptr); | |
1697 | uasm_i_tlbp(p); /* load delay */ | |
1da177e4 LT |
1698 | } |
1699 | ||
234fcd14 | 1700 | static void __cpuinit build_r3000_tlb_load_handler(void) |
1da177e4 LT |
1701 | { |
1702 | u32 *p = handle_tlbl; | |
e30ec452 TS |
1703 | struct uasm_label *l = labels; |
1704 | struct uasm_reloc *r = relocs; | |
1da177e4 LT |
1705 | |
1706 | memset(handle_tlbl, 0, sizeof(handle_tlbl)); | |
1707 | memset(labels, 0, sizeof(labels)); | |
1708 | memset(relocs, 0, sizeof(relocs)); | |
1709 | ||
1710 | build_r3000_tlbchange_handler_head(&p, K0, K1); | |
bf28607f | 1711 | build_pte_present(&p, &r, K0, K1, -1, label_nopage_tlbl); |
e30ec452 | 1712 | uasm_i_nop(&p); /* load delay */ |
1da177e4 | 1713 | build_make_valid(&p, &r, K0, K1); |
fded2e50 | 1714 | build_r3000_tlb_reload_write(&p, &l, &r, K0, K1); |
1da177e4 | 1715 | |
e30ec452 TS |
1716 | uasm_l_nopage_tlbl(&l, p); |
1717 | uasm_i_j(&p, (unsigned long)tlb_do_page_fault_0 & 0x0fffffff); | |
1718 | uasm_i_nop(&p); | |
1da177e4 LT |
1719 | |
1720 | if ((p - handle_tlbl) > FASTPATH_SIZE) | |
1721 | panic("TLB load handler fastpath space exceeded"); | |
1722 | ||
e30ec452 TS |
1723 | uasm_resolve_relocs(relocs, labels); |
1724 | pr_debug("Wrote TLB load handler fastpath (%u instructions).\n", | |
1725 | (unsigned int)(p - handle_tlbl)); | |
1da177e4 | 1726 | |
92b1e6a6 | 1727 | dump_handler(handle_tlbl, ARRAY_SIZE(handle_tlbl)); |
1da177e4 LT |
1728 | } |
1729 | ||
234fcd14 | 1730 | static void __cpuinit build_r3000_tlb_store_handler(void) |
1da177e4 LT |
1731 | { |
1732 | u32 *p = handle_tlbs; | |
e30ec452 TS |
1733 | struct uasm_label *l = labels; |
1734 | struct uasm_reloc *r = relocs; | |
1da177e4 LT |
1735 | |
1736 | memset(handle_tlbs, 0, sizeof(handle_tlbs)); | |
1737 | memset(labels, 0, sizeof(labels)); | |
1738 | memset(relocs, 0, sizeof(relocs)); | |
1739 | ||
1740 | build_r3000_tlbchange_handler_head(&p, K0, K1); | |
bf28607f | 1741 | build_pte_writable(&p, &r, K0, K1, -1, label_nopage_tlbs); |
e30ec452 | 1742 | uasm_i_nop(&p); /* load delay */ |
1da177e4 | 1743 | build_make_write(&p, &r, K0, K1); |
fded2e50 | 1744 | build_r3000_tlb_reload_write(&p, &l, &r, K0, K1); |
1da177e4 | 1745 | |
e30ec452 TS |
1746 | uasm_l_nopage_tlbs(&l, p); |
1747 | uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff); | |
1748 | uasm_i_nop(&p); | |
1da177e4 LT |
1749 | |
1750 | if ((p - handle_tlbs) > FASTPATH_SIZE) | |
1751 | panic("TLB store handler fastpath space exceeded"); | |
1752 | ||
e30ec452 TS |
1753 | uasm_resolve_relocs(relocs, labels); |
1754 | pr_debug("Wrote TLB store handler fastpath (%u instructions).\n", | |
1755 | (unsigned int)(p - handle_tlbs)); | |
1da177e4 | 1756 | |
92b1e6a6 | 1757 | dump_handler(handle_tlbs, ARRAY_SIZE(handle_tlbs)); |
1da177e4 LT |
1758 | } |
1759 | ||
234fcd14 | 1760 | static void __cpuinit build_r3000_tlb_modify_handler(void) |
1da177e4 LT |
1761 | { |
1762 | u32 *p = handle_tlbm; | |
e30ec452 TS |
1763 | struct uasm_label *l = labels; |
1764 | struct uasm_reloc *r = relocs; | |
1da177e4 LT |
1765 | |
1766 | memset(handle_tlbm, 0, sizeof(handle_tlbm)); | |
1767 | memset(labels, 0, sizeof(labels)); | |
1768 | memset(relocs, 0, sizeof(relocs)); | |
1769 | ||
1770 | build_r3000_tlbchange_handler_head(&p, K0, K1); | |
d954ffe3 | 1771 | build_pte_modifiable(&p, &r, K0, K1, -1, label_nopage_tlbm); |
e30ec452 | 1772 | uasm_i_nop(&p); /* load delay */ |
1da177e4 | 1773 | build_make_write(&p, &r, K0, K1); |
fded2e50 | 1774 | build_r3000_pte_reload_tlbwi(&p, K0, K1); |
1da177e4 | 1775 | |
e30ec452 TS |
1776 | uasm_l_nopage_tlbm(&l, p); |
1777 | uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff); | |
1778 | uasm_i_nop(&p); | |
1da177e4 LT |
1779 | |
1780 | if ((p - handle_tlbm) > FASTPATH_SIZE) | |
1781 | panic("TLB modify handler fastpath space exceeded"); | |
1782 | ||
e30ec452 TS |
1783 | uasm_resolve_relocs(relocs, labels); |
1784 | pr_debug("Wrote TLB modify handler fastpath (%u instructions).\n", | |
1785 | (unsigned int)(p - handle_tlbm)); | |
1da177e4 | 1786 | |
92b1e6a6 | 1787 | dump_handler(handle_tlbm, ARRAY_SIZE(handle_tlbm)); |
1da177e4 | 1788 | } |
82622284 | 1789 | #endif /* CONFIG_MIPS_PGD_C0_CONTEXT */ |
1da177e4 LT |
1790 | |
1791 | /* | |
1792 | * R4000 style TLB load/store/modify handlers. | |
1793 | */ | |
bf28607f | 1794 | static struct work_registers __cpuinit |
e30ec452 | 1795 | build_r4000_tlbchange_handler_head(u32 **p, struct uasm_label **l, |
bf28607f | 1796 | struct uasm_reloc **r) |
1da177e4 | 1797 | { |
bf28607f DD |
1798 | struct work_registers wr = build_get_work_registers(p); |
1799 | ||
875d43e7 | 1800 | #ifdef CONFIG_64BIT |
bf28607f | 1801 | build_get_pmde64(p, l, r, wr.r1, wr.r2); /* get pmd in ptr */ |
1da177e4 | 1802 | #else |
bf28607f | 1803 | build_get_pgde32(p, wr.r1, wr.r2); /* get pgd in ptr */ |
1da177e4 LT |
1804 | #endif |
1805 | ||
fd062c84 DD |
1806 | #ifdef CONFIG_HUGETLB_PAGE |
1807 | /* | |
1808 | * For huge tlb entries, pmd doesn't contain an address but | |
1809 | * instead contains the tlb pte. Check the PAGE_HUGE bit and | |
1810 | * see if we need to jump to huge tlb processing. | |
1811 | */ | |
bf28607f | 1812 | build_is_huge_pte(p, r, wr.r1, wr.r2, label_tlb_huge_update); |
fd062c84 DD |
1813 | #endif |
1814 | ||
bf28607f DD |
1815 | UASM_i_MFC0(p, wr.r1, C0_BADVADDR); |
1816 | UASM_i_LW(p, wr.r2, 0, wr.r2); | |
1817 | UASM_i_SRL(p, wr.r1, wr.r1, PAGE_SHIFT + PTE_ORDER - PTE_T_LOG2); | |
1818 | uasm_i_andi(p, wr.r1, wr.r1, (PTRS_PER_PTE - 1) << PTE_T_LOG2); | |
1819 | UASM_i_ADDU(p, wr.r2, wr.r2, wr.r1); | |
1da177e4 LT |
1820 | |
1821 | #ifdef CONFIG_SMP | |
e30ec452 TS |
1822 | uasm_l_smp_pgtable_change(l, *p); |
1823 | #endif | |
bf28607f | 1824 | iPTE_LW(p, wr.r1, wr.r2); /* get even pte */ |
8df5beac MR |
1825 | if (!m4kc_tlbp_war()) |
1826 | build_tlb_probe_entry(p); | |
bf28607f | 1827 | return wr; |
1da177e4 LT |
1828 | } |
1829 | ||
234fcd14 | 1830 | static void __cpuinit |
e30ec452 TS |
1831 | build_r4000_tlbchange_handler_tail(u32 **p, struct uasm_label **l, |
1832 | struct uasm_reloc **r, unsigned int tmp, | |
1da177e4 LT |
1833 | unsigned int ptr) |
1834 | { | |
e30ec452 TS |
1835 | uasm_i_ori(p, ptr, ptr, sizeof(pte_t)); |
1836 | uasm_i_xori(p, ptr, ptr, sizeof(pte_t)); | |
1da177e4 LT |
1837 | build_update_entries(p, tmp, ptr); |
1838 | build_tlb_write_entry(p, l, r, tlb_indexed); | |
e30ec452 | 1839 | uasm_l_leave(l, *p); |
bf28607f | 1840 | build_restore_work_registers(p); |
e30ec452 | 1841 | uasm_i_eret(p); /* return from trap */ |
1da177e4 | 1842 | |
875d43e7 | 1843 | #ifdef CONFIG_64BIT |
1ec56329 | 1844 | build_get_pgd_vmalloc64(p, l, r, tmp, ptr, not_refill); |
1da177e4 LT |
1845 | #endif |
1846 | } | |
1847 | ||
234fcd14 | 1848 | static void __cpuinit build_r4000_tlb_load_handler(void) |
1da177e4 LT |
1849 | { |
1850 | u32 *p = handle_tlbl; | |
e30ec452 TS |
1851 | struct uasm_label *l = labels; |
1852 | struct uasm_reloc *r = relocs; | |
bf28607f | 1853 | struct work_registers wr; |
1da177e4 LT |
1854 | |
1855 | memset(handle_tlbl, 0, sizeof(handle_tlbl)); | |
1856 | memset(labels, 0, sizeof(labels)); | |
1857 | memset(relocs, 0, sizeof(relocs)); | |
1858 | ||
1859 | if (bcm1250_m3_war()) { | |
3d45285d RB |
1860 | unsigned int segbits = 44; |
1861 | ||
1862 | uasm_i_dmfc0(&p, K0, C0_BADVADDR); | |
1863 | uasm_i_dmfc0(&p, K1, C0_ENTRYHI); | |
e30ec452 | 1864 | uasm_i_xor(&p, K0, K0, K1); |
3be6022c DD |
1865 | uasm_i_dsrl_safe(&p, K1, K0, 62); |
1866 | uasm_i_dsrl_safe(&p, K0, K0, 12 + 1); | |
1867 | uasm_i_dsll_safe(&p, K0, K0, 64 + 12 + 1 - segbits); | |
3d45285d | 1868 | uasm_i_or(&p, K0, K0, K1); |
e30ec452 TS |
1869 | uasm_il_bnez(&p, &r, K0, label_leave); |
1870 | /* No need for uasm_i_nop */ | |
1da177e4 LT |
1871 | } |
1872 | ||
bf28607f DD |
1873 | wr = build_r4000_tlbchange_handler_head(&p, &l, &r); |
1874 | build_pte_present(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbl); | |
8df5beac MR |
1875 | if (m4kc_tlbp_war()) |
1876 | build_tlb_probe_entry(&p); | |
6dd9344c DD |
1877 | |
1878 | if (kernel_uses_smartmips_rixi) { | |
1879 | /* | |
1880 | * If the page is not _PAGE_VALID, RI or XI could not | |
1881 | * have triggered it. Skip the expensive test.. | |
1882 | */ | |
cc33ae43 | 1883 | if (use_bbit_insns()) { |
bf28607f | 1884 | uasm_il_bbit0(&p, &r, wr.r1, ilog2(_PAGE_VALID), |
cc33ae43 DD |
1885 | label_tlbl_goaround1); |
1886 | } else { | |
bf28607f DD |
1887 | uasm_i_andi(&p, wr.r3, wr.r1, _PAGE_VALID); |
1888 | uasm_il_beqz(&p, &r, wr.r3, label_tlbl_goaround1); | |
cc33ae43 | 1889 | } |
6dd9344c DD |
1890 | uasm_i_nop(&p); |
1891 | ||
1892 | uasm_i_tlbr(&p); | |
1893 | /* Examine entrylo 0 or 1 based on ptr. */ | |
cc33ae43 | 1894 | if (use_bbit_insns()) { |
bf28607f | 1895 | uasm_i_bbit0(&p, wr.r2, ilog2(sizeof(pte_t)), 8); |
cc33ae43 | 1896 | } else { |
bf28607f DD |
1897 | uasm_i_andi(&p, wr.r3, wr.r2, sizeof(pte_t)); |
1898 | uasm_i_beqz(&p, wr.r3, 8); | |
cc33ae43 | 1899 | } |
bf28607f DD |
1900 | /* load it in the delay slot*/ |
1901 | UASM_i_MFC0(&p, wr.r3, C0_ENTRYLO0); | |
1902 | /* load it if ptr is odd */ | |
1903 | UASM_i_MFC0(&p, wr.r3, C0_ENTRYLO1); | |
6dd9344c | 1904 | /* |
bf28607f | 1905 | * If the entryLo (now in wr.r3) is valid (bit 1), RI or |
6dd9344c DD |
1906 | * XI must have triggered it. |
1907 | */ | |
cc33ae43 | 1908 | if (use_bbit_insns()) { |
bf28607f DD |
1909 | uasm_il_bbit1(&p, &r, wr.r3, 1, label_nopage_tlbl); |
1910 | uasm_i_nop(&p); | |
cc33ae43 DD |
1911 | uasm_l_tlbl_goaround1(&l, p); |
1912 | } else { | |
bf28607f DD |
1913 | uasm_i_andi(&p, wr.r3, wr.r3, 2); |
1914 | uasm_il_bnez(&p, &r, wr.r3, label_nopage_tlbl); | |
1915 | uasm_i_nop(&p); | |
cc33ae43 | 1916 | } |
bf28607f | 1917 | uasm_l_tlbl_goaround1(&l, p); |
6dd9344c | 1918 | } |
bf28607f DD |
1919 | build_make_valid(&p, &r, wr.r1, wr.r2); |
1920 | build_r4000_tlbchange_handler_tail(&p, &l, &r, wr.r1, wr.r2); | |
1da177e4 | 1921 | |
fd062c84 DD |
1922 | #ifdef CONFIG_HUGETLB_PAGE |
1923 | /* | |
1924 | * This is the entry point when build_r4000_tlbchange_handler_head | |
1925 | * spots a huge page. | |
1926 | */ | |
1927 | uasm_l_tlb_huge_update(&l, p); | |
bf28607f DD |
1928 | iPTE_LW(&p, wr.r1, wr.r2); |
1929 | build_pte_present(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbl); | |
fd062c84 | 1930 | build_tlb_probe_entry(&p); |
6dd9344c DD |
1931 | |
1932 | if (kernel_uses_smartmips_rixi) { | |
1933 | /* | |
1934 | * If the page is not _PAGE_VALID, RI or XI could not | |
1935 | * have triggered it. Skip the expensive test.. | |
1936 | */ | |
cc33ae43 | 1937 | if (use_bbit_insns()) { |
bf28607f | 1938 | uasm_il_bbit0(&p, &r, wr.r1, ilog2(_PAGE_VALID), |
cc33ae43 DD |
1939 | label_tlbl_goaround2); |
1940 | } else { | |
bf28607f DD |
1941 | uasm_i_andi(&p, wr.r3, wr.r1, _PAGE_VALID); |
1942 | uasm_il_beqz(&p, &r, wr.r3, label_tlbl_goaround2); | |
cc33ae43 | 1943 | } |
6dd9344c DD |
1944 | uasm_i_nop(&p); |
1945 | ||
1946 | uasm_i_tlbr(&p); | |
1947 | /* Examine entrylo 0 or 1 based on ptr. */ | |
cc33ae43 | 1948 | if (use_bbit_insns()) { |
bf28607f | 1949 | uasm_i_bbit0(&p, wr.r2, ilog2(sizeof(pte_t)), 8); |
cc33ae43 | 1950 | } else { |
bf28607f DD |
1951 | uasm_i_andi(&p, wr.r3, wr.r2, sizeof(pte_t)); |
1952 | uasm_i_beqz(&p, wr.r3, 8); | |
cc33ae43 | 1953 | } |
bf28607f DD |
1954 | /* load it in the delay slot*/ |
1955 | UASM_i_MFC0(&p, wr.r3, C0_ENTRYLO0); | |
1956 | /* load it if ptr is odd */ | |
1957 | UASM_i_MFC0(&p, wr.r3, C0_ENTRYLO1); | |
6dd9344c | 1958 | /* |
bf28607f | 1959 | * If the entryLo (now in wr.r3) is valid (bit 1), RI or |
6dd9344c DD |
1960 | * XI must have triggered it. |
1961 | */ | |
cc33ae43 | 1962 | if (use_bbit_insns()) { |
bf28607f | 1963 | uasm_il_bbit0(&p, &r, wr.r3, 1, label_tlbl_goaround2); |
cc33ae43 | 1964 | } else { |
bf28607f DD |
1965 | uasm_i_andi(&p, wr.r3, wr.r3, 2); |
1966 | uasm_il_beqz(&p, &r, wr.r3, label_tlbl_goaround2); | |
cc33ae43 | 1967 | } |
0f4ccbc8 DD |
1968 | if (PM_DEFAULT_MASK == 0) |
1969 | uasm_i_nop(&p); | |
6dd9344c DD |
1970 | /* |
1971 | * We clobbered C0_PAGEMASK, restore it. On the other branch | |
1972 | * it is restored in build_huge_tlb_write_entry. | |
1973 | */ | |
bf28607f | 1974 | build_restore_pagemask(&p, &r, wr.r3, label_nopage_tlbl, 0); |
6dd9344c DD |
1975 | |
1976 | uasm_l_tlbl_goaround2(&l, p); | |
1977 | } | |
bf28607f DD |
1978 | uasm_i_ori(&p, wr.r1, wr.r1, (_PAGE_ACCESSED | _PAGE_VALID)); |
1979 | build_huge_handler_tail(&p, &r, &l, wr.r1, wr.r2); | |
fd062c84 DD |
1980 | #endif |
1981 | ||
e30ec452 | 1982 | uasm_l_nopage_tlbl(&l, p); |
bf28607f | 1983 | build_restore_work_registers(&p); |
e30ec452 TS |
1984 | uasm_i_j(&p, (unsigned long)tlb_do_page_fault_0 & 0x0fffffff); |
1985 | uasm_i_nop(&p); | |
1da177e4 LT |
1986 | |
1987 | if ((p - handle_tlbl) > FASTPATH_SIZE) | |
1988 | panic("TLB load handler fastpath space exceeded"); | |
1989 | ||
e30ec452 TS |
1990 | uasm_resolve_relocs(relocs, labels); |
1991 | pr_debug("Wrote TLB load handler fastpath (%u instructions).\n", | |
1992 | (unsigned int)(p - handle_tlbl)); | |
1da177e4 | 1993 | |
92b1e6a6 | 1994 | dump_handler(handle_tlbl, ARRAY_SIZE(handle_tlbl)); |
1da177e4 LT |
1995 | } |
1996 | ||
234fcd14 | 1997 | static void __cpuinit build_r4000_tlb_store_handler(void) |
1da177e4 LT |
1998 | { |
1999 | u32 *p = handle_tlbs; | |
e30ec452 TS |
2000 | struct uasm_label *l = labels; |
2001 | struct uasm_reloc *r = relocs; | |
bf28607f | 2002 | struct work_registers wr; |
1da177e4 LT |
2003 | |
2004 | memset(handle_tlbs, 0, sizeof(handle_tlbs)); | |
2005 | memset(labels, 0, sizeof(labels)); | |
2006 | memset(relocs, 0, sizeof(relocs)); | |
2007 | ||
bf28607f DD |
2008 | wr = build_r4000_tlbchange_handler_head(&p, &l, &r); |
2009 | build_pte_writable(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbs); | |
8df5beac MR |
2010 | if (m4kc_tlbp_war()) |
2011 | build_tlb_probe_entry(&p); | |
bf28607f DD |
2012 | build_make_write(&p, &r, wr.r1, wr.r2); |
2013 | build_r4000_tlbchange_handler_tail(&p, &l, &r, wr.r1, wr.r2); | |
1da177e4 | 2014 | |
fd062c84 DD |
2015 | #ifdef CONFIG_HUGETLB_PAGE |
2016 | /* | |
2017 | * This is the entry point when | |
2018 | * build_r4000_tlbchange_handler_head spots a huge page. | |
2019 | */ | |
2020 | uasm_l_tlb_huge_update(&l, p); | |
bf28607f DD |
2021 | iPTE_LW(&p, wr.r1, wr.r2); |
2022 | build_pte_writable(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbs); | |
fd062c84 | 2023 | build_tlb_probe_entry(&p); |
bf28607f | 2024 | uasm_i_ori(&p, wr.r1, wr.r1, |
fd062c84 | 2025 | _PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID | _PAGE_DIRTY); |
bf28607f | 2026 | build_huge_handler_tail(&p, &r, &l, wr.r1, wr.r2); |
fd062c84 DD |
2027 | #endif |
2028 | ||
e30ec452 | 2029 | uasm_l_nopage_tlbs(&l, p); |
bf28607f | 2030 | build_restore_work_registers(&p); |
e30ec452 TS |
2031 | uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff); |
2032 | uasm_i_nop(&p); | |
1da177e4 LT |
2033 | |
2034 | if ((p - handle_tlbs) > FASTPATH_SIZE) | |
2035 | panic("TLB store handler fastpath space exceeded"); | |
2036 | ||
e30ec452 TS |
2037 | uasm_resolve_relocs(relocs, labels); |
2038 | pr_debug("Wrote TLB store handler fastpath (%u instructions).\n", | |
2039 | (unsigned int)(p - handle_tlbs)); | |
1da177e4 | 2040 | |
92b1e6a6 | 2041 | dump_handler(handle_tlbs, ARRAY_SIZE(handle_tlbs)); |
1da177e4 LT |
2042 | } |
2043 | ||
234fcd14 | 2044 | static void __cpuinit build_r4000_tlb_modify_handler(void) |
1da177e4 LT |
2045 | { |
2046 | u32 *p = handle_tlbm; | |
e30ec452 TS |
2047 | struct uasm_label *l = labels; |
2048 | struct uasm_reloc *r = relocs; | |
bf28607f | 2049 | struct work_registers wr; |
1da177e4 LT |
2050 | |
2051 | memset(handle_tlbm, 0, sizeof(handle_tlbm)); | |
2052 | memset(labels, 0, sizeof(labels)); | |
2053 | memset(relocs, 0, sizeof(relocs)); | |
2054 | ||
bf28607f DD |
2055 | wr = build_r4000_tlbchange_handler_head(&p, &l, &r); |
2056 | build_pte_modifiable(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbm); | |
8df5beac MR |
2057 | if (m4kc_tlbp_war()) |
2058 | build_tlb_probe_entry(&p); | |
1da177e4 | 2059 | /* Present and writable bits set, set accessed and dirty bits. */ |
bf28607f DD |
2060 | build_make_write(&p, &r, wr.r1, wr.r2); |
2061 | build_r4000_tlbchange_handler_tail(&p, &l, &r, wr.r1, wr.r2); | |
1da177e4 | 2062 | |
fd062c84 DD |
2063 | #ifdef CONFIG_HUGETLB_PAGE |
2064 | /* | |
2065 | * This is the entry point when | |
2066 | * build_r4000_tlbchange_handler_head spots a huge page. | |
2067 | */ | |
2068 | uasm_l_tlb_huge_update(&l, p); | |
bf28607f DD |
2069 | iPTE_LW(&p, wr.r1, wr.r2); |
2070 | build_pte_modifiable(&p, &r, wr.r1, wr.r2, wr.r3, label_nopage_tlbm); | |
fd062c84 | 2071 | build_tlb_probe_entry(&p); |
bf28607f | 2072 | uasm_i_ori(&p, wr.r1, wr.r1, |
fd062c84 | 2073 | _PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID | _PAGE_DIRTY); |
bf28607f | 2074 | build_huge_handler_tail(&p, &r, &l, wr.r1, wr.r2); |
fd062c84 DD |
2075 | #endif |
2076 | ||
e30ec452 | 2077 | uasm_l_nopage_tlbm(&l, p); |
bf28607f | 2078 | build_restore_work_registers(&p); |
e30ec452 TS |
2079 | uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff); |
2080 | uasm_i_nop(&p); | |
1da177e4 LT |
2081 | |
2082 | if ((p - handle_tlbm) > FASTPATH_SIZE) | |
2083 | panic("TLB modify handler fastpath space exceeded"); | |
2084 | ||
e30ec452 TS |
2085 | uasm_resolve_relocs(relocs, labels); |
2086 | pr_debug("Wrote TLB modify handler fastpath (%u instructions).\n", | |
2087 | (unsigned int)(p - handle_tlbm)); | |
115f2a44 | 2088 | |
92b1e6a6 | 2089 | dump_handler(handle_tlbm, ARRAY_SIZE(handle_tlbm)); |
1da177e4 LT |
2090 | } |
2091 | ||
234fcd14 | 2092 | void __cpuinit build_tlb_refill_handler(void) |
1da177e4 LT |
2093 | { |
2094 | /* | |
2095 | * The refill handler is generated per-CPU, multi-node systems | |
2096 | * may have local storage for it. The other handlers are only | |
2097 | * needed once. | |
2098 | */ | |
2099 | static int run_once = 0; | |
2100 | ||
1ec56329 DD |
2101 | #ifdef CONFIG_64BIT |
2102 | check_for_high_segbits = current_cpu_data.vmbits > (PGDIR_SHIFT + PGD_ORDER + PAGE_SHIFT - 3); | |
2103 | #endif | |
2104 | ||
10cc3529 | 2105 | switch (current_cpu_type()) { |
1da177e4 LT |
2106 | case CPU_R2000: |
2107 | case CPU_R3000: | |
2108 | case CPU_R3000A: | |
2109 | case CPU_R3081E: | |
2110 | case CPU_TX3912: | |
2111 | case CPU_TX3922: | |
2112 | case CPU_TX3927: | |
82622284 | 2113 | #ifndef CONFIG_MIPS_PGD_C0_CONTEXT |
1da177e4 LT |
2114 | build_r3000_tlb_refill_handler(); |
2115 | if (!run_once) { | |
2116 | build_r3000_tlb_load_handler(); | |
2117 | build_r3000_tlb_store_handler(); | |
2118 | build_r3000_tlb_modify_handler(); | |
2119 | run_once++; | |
2120 | } | |
82622284 DD |
2121 | #else |
2122 | panic("No R3000 TLB refill handler"); | |
2123 | #endif | |
1da177e4 LT |
2124 | break; |
2125 | ||
2126 | case CPU_R6000: | |
2127 | case CPU_R6000A: | |
2128 | panic("No R6000 TLB refill handler yet"); | |
2129 | break; | |
2130 | ||
2131 | case CPU_R8000: | |
2132 | panic("No R8000 TLB refill handler yet"); | |
2133 | break; | |
2134 | ||
2135 | default: | |
1da177e4 | 2136 | if (!run_once) { |
bf28607f | 2137 | scratch_reg = allocate_kscratch(); |
3d8bfdd0 DD |
2138 | #ifdef CONFIG_MIPS_PGD_C0_CONTEXT |
2139 | build_r4000_setup_pgd(); | |
2140 | #endif | |
1da177e4 LT |
2141 | build_r4000_tlb_load_handler(); |
2142 | build_r4000_tlb_store_handler(); | |
2143 | build_r4000_tlb_modify_handler(); | |
2144 | run_once++; | |
2145 | } | |
3d8bfdd0 | 2146 | build_r4000_tlb_refill_handler(); |
1da177e4 LT |
2147 | } |
2148 | } | |
1d40cfcd | 2149 | |
234fcd14 | 2150 | void __cpuinit flush_tlb_handlers(void) |
1d40cfcd | 2151 | { |
e0cee3ee | 2152 | local_flush_icache_range((unsigned long)handle_tlbl, |
1d40cfcd | 2153 | (unsigned long)handle_tlbl + sizeof(handle_tlbl)); |
e0cee3ee | 2154 | local_flush_icache_range((unsigned long)handle_tlbs, |
1d40cfcd | 2155 | (unsigned long)handle_tlbs + sizeof(handle_tlbs)); |
e0cee3ee | 2156 | local_flush_icache_range((unsigned long)handle_tlbm, |
1d40cfcd | 2157 | (unsigned long)handle_tlbm + sizeof(handle_tlbm)); |
3d8bfdd0 DD |
2158 | #ifdef CONFIG_MIPS_PGD_C0_CONTEXT |
2159 | local_flush_icache_range((unsigned long)tlbmiss_handler_setup_pgd, | |
2160 | (unsigned long)tlbmiss_handler_setup_pgd + sizeof(handle_tlbm)); | |
2161 | #endif | |
1d40cfcd | 2162 | } |