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1da177e4 LT |
1 | /* $Id: sun4c.c,v 1.212 2001/12/21 04:56:15 davem Exp $ |
2 | * sun4c.c: Doing in software what should be done in hardware. | |
3 | * | |
4 | * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) | |
5 | * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) | |
6 | * Copyright (C) 1996 Andrew Tridgell (Andrew.Tridgell@anu.edu.au) | |
7 | * Copyright (C) 1997-2000 Anton Blanchard (anton@samba.org) | |
8 | * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
9 | */ | |
10 | ||
11 | #define NR_TASK_BUCKETS 512 | |
12 | ||
13 | #include <linux/config.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/bootmem.h> | |
18 | #include <linux/highmem.h> | |
19 | #include <linux/fs.h> | |
20 | #include <linux/seq_file.h> | |
21 | ||
22 | #include <asm/scatterlist.h> | |
23 | #include <asm/page.h> | |
24 | #include <asm/pgalloc.h> | |
25 | #include <asm/pgtable.h> | |
26 | #include <asm/vaddrs.h> | |
27 | #include <asm/idprom.h> | |
28 | #include <asm/machines.h> | |
29 | #include <asm/memreg.h> | |
30 | #include <asm/processor.h> | |
31 | #include <asm/auxio.h> | |
32 | #include <asm/io.h> | |
33 | #include <asm/oplib.h> | |
34 | #include <asm/openprom.h> | |
35 | #include <asm/mmu_context.h> | |
36 | #include <asm/sun4paddr.h> | |
37 | #include <asm/highmem.h> | |
38 | #include <asm/btfixup.h> | |
39 | #include <asm/cacheflush.h> | |
40 | #include <asm/tlbflush.h> | |
41 | ||
42 | /* Because of our dynamic kernel TLB miss strategy, and how | |
43 | * our DVMA mapping allocation works, you _MUST_: | |
44 | * | |
45 | * 1) Disable interrupts _and_ not touch any dynamic kernel | |
46 | * memory while messing with kernel MMU state. By | |
47 | * dynamic memory I mean any object which is not in | |
48 | * the kernel image itself or a thread_union (both of | |
49 | * which are locked into the MMU). | |
50 | * 2) Disable interrupts while messing with user MMU state. | |
51 | */ | |
52 | ||
53 | extern int num_segmaps, num_contexts; | |
54 | ||
55 | extern unsigned long page_kernel; | |
56 | ||
57 | #ifdef CONFIG_SUN4 | |
58 | #define SUN4C_VAC_SIZE sun4c_vacinfo.num_bytes | |
59 | #else | |
60 | /* That's it, we prom_halt() on sun4c if the cache size is something other than 65536. | |
61 | * So let's save some cycles and just use that everywhere except for that bootup | |
62 | * sanity check. | |
63 | */ | |
64 | #define SUN4C_VAC_SIZE 65536 | |
65 | #endif | |
66 | ||
67 | #define SUN4C_KERNEL_BUCKETS 32 | |
68 | ||
69 | /* Flushing the cache. */ | |
70 | struct sun4c_vac_props sun4c_vacinfo; | |
71 | unsigned long sun4c_kernel_faults; | |
72 | ||
73 | /* Invalidate every sun4c cache line tag. */ | |
74 | static void __init sun4c_flush_all(void) | |
75 | { | |
76 | unsigned long begin, end; | |
77 | ||
78 | if (sun4c_vacinfo.on) | |
79 | panic("SUN4C: AIEEE, trying to invalidate vac while it is on."); | |
80 | ||
81 | /* Clear 'valid' bit in all cache line tags */ | |
82 | begin = AC_CACHETAGS; | |
83 | end = (AC_CACHETAGS + SUN4C_VAC_SIZE); | |
84 | while (begin < end) { | |
85 | __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : : | |
86 | "r" (begin), "i" (ASI_CONTROL)); | |
87 | begin += sun4c_vacinfo.linesize; | |
88 | } | |
89 | } | |
90 | ||
91 | static void sun4c_flush_context_hw(void) | |
92 | { | |
93 | unsigned long end = SUN4C_VAC_SIZE; | |
94 | ||
95 | __asm__ __volatile__( | |
96 | "1: addcc %0, -4096, %0\n\t" | |
97 | " bne 1b\n\t" | |
98 | " sta %%g0, [%0] %2" | |
99 | : "=&r" (end) | |
100 | : "0" (end), "i" (ASI_HWFLUSHCONTEXT) | |
101 | : "cc"); | |
102 | } | |
103 | ||
104 | /* Must be called minimally with IRQs disabled. */ | |
105 | static void sun4c_flush_segment_hw(unsigned long addr) | |
106 | { | |
107 | if (sun4c_get_segmap(addr) != invalid_segment) { | |
108 | unsigned long vac_size = SUN4C_VAC_SIZE; | |
109 | ||
110 | __asm__ __volatile__( | |
111 | "1: addcc %0, -4096, %0\n\t" | |
112 | " bne 1b\n\t" | |
113 | " sta %%g0, [%2 + %0] %3" | |
114 | : "=&r" (vac_size) | |
115 | : "0" (vac_size), "r" (addr), "i" (ASI_HWFLUSHSEG) | |
116 | : "cc"); | |
117 | } | |
118 | } | |
119 | ||
120 | /* File local boot time fixups. */ | |
121 | BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long) | |
122 | BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long) | |
123 | BTFIXUPDEF_CALL(void, sun4c_flush_context, void) | |
124 | ||
125 | #define sun4c_flush_page(addr) BTFIXUP_CALL(sun4c_flush_page)(addr) | |
126 | #define sun4c_flush_segment(addr) BTFIXUP_CALL(sun4c_flush_segment)(addr) | |
127 | #define sun4c_flush_context() BTFIXUP_CALL(sun4c_flush_context)() | |
128 | ||
129 | /* Must be called minimally with interrupts disabled. */ | |
130 | static void sun4c_flush_page_hw(unsigned long addr) | |
131 | { | |
132 | addr &= PAGE_MASK; | |
133 | if ((int)sun4c_get_pte(addr) < 0) | |
134 | __asm__ __volatile__("sta %%g0, [%0] %1" | |
135 | : : "r" (addr), "i" (ASI_HWFLUSHPAGE)); | |
136 | } | |
137 | ||
138 | /* Don't inline the software version as it eats too many cache lines if expanded. */ | |
139 | static void sun4c_flush_context_sw(void) | |
140 | { | |
141 | unsigned long nbytes = SUN4C_VAC_SIZE; | |
142 | unsigned long lsize = sun4c_vacinfo.linesize; | |
143 | ||
144 | __asm__ __volatile__( | |
145 | "add %2, %2, %%g1\n\t" | |
146 | "add %2, %%g1, %%g2\n\t" | |
147 | "add %2, %%g2, %%g3\n\t" | |
148 | "add %2, %%g3, %%g4\n\t" | |
149 | "add %2, %%g4, %%g5\n\t" | |
150 | "add %2, %%g5, %%o4\n\t" | |
151 | "add %2, %%o4, %%o5\n" | |
152 | "1:\n\t" | |
153 | "subcc %0, %%o5, %0\n\t" | |
154 | "sta %%g0, [%0] %3\n\t" | |
155 | "sta %%g0, [%0 + %2] %3\n\t" | |
156 | "sta %%g0, [%0 + %%g1] %3\n\t" | |
157 | "sta %%g0, [%0 + %%g2] %3\n\t" | |
158 | "sta %%g0, [%0 + %%g3] %3\n\t" | |
159 | "sta %%g0, [%0 + %%g4] %3\n\t" | |
160 | "sta %%g0, [%0 + %%g5] %3\n\t" | |
161 | "bg 1b\n\t" | |
162 | " sta %%g0, [%1 + %%o4] %3\n" | |
163 | : "=&r" (nbytes) | |
164 | : "0" (nbytes), "r" (lsize), "i" (ASI_FLUSHCTX) | |
165 | : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc"); | |
166 | } | |
167 | ||
168 | /* Don't inline the software version as it eats too many cache lines if expanded. */ | |
169 | static void sun4c_flush_segment_sw(unsigned long addr) | |
170 | { | |
171 | if (sun4c_get_segmap(addr) != invalid_segment) { | |
172 | unsigned long nbytes = SUN4C_VAC_SIZE; | |
173 | unsigned long lsize = sun4c_vacinfo.linesize; | |
174 | ||
175 | __asm__ __volatile__( | |
176 | "add %2, %2, %%g1\n\t" | |
177 | "add %2, %%g1, %%g2\n\t" | |
178 | "add %2, %%g2, %%g3\n\t" | |
179 | "add %2, %%g3, %%g4\n\t" | |
180 | "add %2, %%g4, %%g5\n\t" | |
181 | "add %2, %%g5, %%o4\n\t" | |
182 | "add %2, %%o4, %%o5\n" | |
183 | "1:\n\t" | |
184 | "subcc %1, %%o5, %1\n\t" | |
185 | "sta %%g0, [%0] %6\n\t" | |
186 | "sta %%g0, [%0 + %2] %6\n\t" | |
187 | "sta %%g0, [%0 + %%g1] %6\n\t" | |
188 | "sta %%g0, [%0 + %%g2] %6\n\t" | |
189 | "sta %%g0, [%0 + %%g3] %6\n\t" | |
190 | "sta %%g0, [%0 + %%g4] %6\n\t" | |
191 | "sta %%g0, [%0 + %%g5] %6\n\t" | |
192 | "sta %%g0, [%0 + %%o4] %6\n\t" | |
193 | "bg 1b\n\t" | |
194 | " add %0, %%o5, %0\n" | |
195 | : "=&r" (addr), "=&r" (nbytes), "=&r" (lsize) | |
196 | : "0" (addr), "1" (nbytes), "2" (lsize), | |
197 | "i" (ASI_FLUSHSEG) | |
198 | : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc"); | |
199 | } | |
200 | } | |
201 | ||
202 | /* Don't inline the software version as it eats too many cache lines if expanded. */ | |
203 | static void sun4c_flush_page_sw(unsigned long addr) | |
204 | { | |
205 | addr &= PAGE_MASK; | |
206 | if ((sun4c_get_pte(addr) & (_SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_VALID)) == | |
207 | _SUN4C_PAGE_VALID) { | |
208 | unsigned long left = PAGE_SIZE; | |
209 | unsigned long lsize = sun4c_vacinfo.linesize; | |
210 | ||
211 | __asm__ __volatile__( | |
212 | "add %2, %2, %%g1\n\t" | |
213 | "add %2, %%g1, %%g2\n\t" | |
214 | "add %2, %%g2, %%g3\n\t" | |
215 | "add %2, %%g3, %%g4\n\t" | |
216 | "add %2, %%g4, %%g5\n\t" | |
217 | "add %2, %%g5, %%o4\n\t" | |
218 | "add %2, %%o4, %%o5\n" | |
219 | "1:\n\t" | |
220 | "subcc %1, %%o5, %1\n\t" | |
221 | "sta %%g0, [%0] %6\n\t" | |
222 | "sta %%g0, [%0 + %2] %6\n\t" | |
223 | "sta %%g0, [%0 + %%g1] %6\n\t" | |
224 | "sta %%g0, [%0 + %%g2] %6\n\t" | |
225 | "sta %%g0, [%0 + %%g3] %6\n\t" | |
226 | "sta %%g0, [%0 + %%g4] %6\n\t" | |
227 | "sta %%g0, [%0 + %%g5] %6\n\t" | |
228 | "sta %%g0, [%0 + %%o4] %6\n\t" | |
229 | "bg 1b\n\t" | |
230 | " add %0, %%o5, %0\n" | |
231 | : "=&r" (addr), "=&r" (left), "=&r" (lsize) | |
232 | : "0" (addr), "1" (left), "2" (lsize), | |
233 | "i" (ASI_FLUSHPG) | |
234 | : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc"); | |
235 | } | |
236 | } | |
237 | ||
238 | /* The sun4c's do have an on chip store buffer. And the way you | |
239 | * clear them out isn't so obvious. The only way I can think of | |
240 | * to accomplish this is to read the current context register, | |
241 | * store the same value there, then read an external hardware | |
242 | * register. | |
243 | */ | |
244 | void sun4c_complete_all_stores(void) | |
245 | { | |
246 | volatile int _unused; | |
247 | ||
248 | _unused = sun4c_get_context(); | |
249 | sun4c_set_context(_unused); | |
250 | #ifdef CONFIG_SUN_AUXIO | |
251 | _unused = get_auxio(); | |
252 | #endif | |
253 | } | |
254 | ||
255 | /* Bootup utility functions. */ | |
256 | static inline void sun4c_init_clean_segmap(unsigned char pseg) | |
257 | { | |
258 | unsigned long vaddr; | |
259 | ||
260 | sun4c_put_segmap(0, pseg); | |
261 | for (vaddr = 0; vaddr < SUN4C_REAL_PGDIR_SIZE; vaddr += PAGE_SIZE) | |
262 | sun4c_put_pte(vaddr, 0); | |
263 | sun4c_put_segmap(0, invalid_segment); | |
264 | } | |
265 | ||
266 | static inline void sun4c_init_clean_mmu(unsigned long kernel_end) | |
267 | { | |
268 | unsigned long vaddr; | |
269 | unsigned char savectx, ctx; | |
270 | ||
271 | savectx = sun4c_get_context(); | |
272 | kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end); | |
273 | for (ctx = 0; ctx < num_contexts; ctx++) { | |
274 | sun4c_set_context(ctx); | |
275 | for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE) | |
276 | sun4c_put_segmap(vaddr, invalid_segment); | |
277 | for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE) | |
278 | sun4c_put_segmap(vaddr, invalid_segment); | |
279 | for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE) | |
280 | sun4c_put_segmap(vaddr, invalid_segment); | |
281 | for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE) | |
282 | sun4c_put_segmap(vaddr, invalid_segment); | |
283 | } | |
284 | sun4c_set_context(savectx); | |
285 | } | |
286 | ||
287 | void __init sun4c_probe_vac(void) | |
288 | { | |
289 | sun4c_disable_vac(); | |
290 | ||
291 | if (ARCH_SUN4) { | |
292 | switch (idprom->id_machtype) { | |
293 | ||
294 | case (SM_SUN4|SM_4_110): | |
295 | sun4c_vacinfo.type = VAC_NONE; | |
296 | sun4c_vacinfo.num_bytes = 0; | |
297 | sun4c_vacinfo.linesize = 0; | |
298 | sun4c_vacinfo.do_hwflushes = 0; | |
299 | prom_printf("No VAC. Get some bucks and buy a real computer."); | |
300 | prom_halt(); | |
301 | break; | |
302 | ||
303 | case (SM_SUN4|SM_4_260): | |
304 | sun4c_vacinfo.type = VAC_WRITE_BACK; | |
305 | sun4c_vacinfo.num_bytes = 128 * 1024; | |
306 | sun4c_vacinfo.linesize = 16; | |
307 | sun4c_vacinfo.do_hwflushes = 0; | |
308 | break; | |
309 | ||
310 | case (SM_SUN4|SM_4_330): | |
311 | sun4c_vacinfo.type = VAC_WRITE_THROUGH; | |
312 | sun4c_vacinfo.num_bytes = 128 * 1024; | |
313 | sun4c_vacinfo.linesize = 16; | |
314 | sun4c_vacinfo.do_hwflushes = 0; | |
315 | break; | |
316 | ||
317 | case (SM_SUN4|SM_4_470): | |
318 | sun4c_vacinfo.type = VAC_WRITE_BACK; | |
319 | sun4c_vacinfo.num_bytes = 128 * 1024; | |
320 | sun4c_vacinfo.linesize = 32; | |
321 | sun4c_vacinfo.do_hwflushes = 0; | |
322 | break; | |
323 | ||
324 | default: | |
325 | prom_printf("Cannot initialize VAC - weird sun4 model idprom->id_machtype = %d", idprom->id_machtype); | |
326 | prom_halt(); | |
327 | }; | |
328 | } else { | |
329 | sun4c_vacinfo.type = VAC_WRITE_THROUGH; | |
330 | ||
331 | if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) || | |
332 | (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) { | |
333 | /* PROM on SS1 lacks this info, to be super safe we | |
334 | * hard code it here since this arch is cast in stone. | |
335 | */ | |
336 | sun4c_vacinfo.num_bytes = 65536; | |
337 | sun4c_vacinfo.linesize = 16; | |
338 | } else { | |
339 | sun4c_vacinfo.num_bytes = | |
340 | prom_getintdefault(prom_root_node, "vac-size", 65536); | |
341 | sun4c_vacinfo.linesize = | |
342 | prom_getintdefault(prom_root_node, "vac-linesize", 16); | |
343 | } | |
344 | sun4c_vacinfo.do_hwflushes = | |
345 | prom_getintdefault(prom_root_node, "vac-hwflush", 0); | |
346 | ||
347 | if (sun4c_vacinfo.do_hwflushes == 0) | |
348 | sun4c_vacinfo.do_hwflushes = | |
349 | prom_getintdefault(prom_root_node, "vac_hwflush", 0); | |
350 | ||
351 | if (sun4c_vacinfo.num_bytes != 65536) { | |
352 | prom_printf("WEIRD Sun4C VAC cache size, " | |
353 | "tell sparclinux@vger.kernel.org"); | |
354 | prom_halt(); | |
355 | } | |
356 | } | |
357 | ||
358 | sun4c_vacinfo.num_lines = | |
359 | (sun4c_vacinfo.num_bytes / sun4c_vacinfo.linesize); | |
360 | switch (sun4c_vacinfo.linesize) { | |
361 | case 16: | |
362 | sun4c_vacinfo.log2lsize = 4; | |
363 | break; | |
364 | case 32: | |
365 | sun4c_vacinfo.log2lsize = 5; | |
366 | break; | |
367 | default: | |
368 | prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n", | |
369 | sun4c_vacinfo.linesize); | |
370 | prom_halt(); | |
371 | }; | |
372 | ||
373 | sun4c_flush_all(); | |
374 | sun4c_enable_vac(); | |
375 | } | |
376 | ||
377 | /* Patch instructions for the low level kernel fault handler. */ | |
378 | extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff; | |
379 | extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff; | |
380 | extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff; | |
381 | extern unsigned long num_context_patch1, num_context_patch1_16; | |
382 | extern unsigned long num_context_patch2_16; | |
383 | extern unsigned long vac_linesize_patch, vac_linesize_patch_32; | |
384 | extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on; | |
385 | extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on; | |
386 | ||
387 | #define PATCH_INSN(src, dst) do { \ | |
388 | daddr = &(dst); \ | |
389 | iaddr = &(src); \ | |
390 | *daddr = *iaddr; \ | |
391 | } while (0) | |
392 | ||
393 | static void __init patch_kernel_fault_handler(void) | |
394 | { | |
395 | unsigned long *iaddr, *daddr; | |
396 | ||
397 | switch (num_segmaps) { | |
398 | case 128: | |
399 | /* Default, nothing to do. */ | |
400 | break; | |
401 | case 256: | |
402 | PATCH_INSN(invalid_segment_patch1_ff, | |
403 | invalid_segment_patch1); | |
404 | PATCH_INSN(invalid_segment_patch2_ff, | |
405 | invalid_segment_patch2); | |
406 | break; | |
407 | case 512: | |
408 | PATCH_INSN(invalid_segment_patch1_1ff, | |
409 | invalid_segment_patch1); | |
410 | PATCH_INSN(invalid_segment_patch2_1ff, | |
411 | invalid_segment_patch2); | |
412 | break; | |
413 | default: | |
414 | prom_printf("Unhandled number of segmaps: %d\n", | |
415 | num_segmaps); | |
416 | prom_halt(); | |
417 | }; | |
418 | switch (num_contexts) { | |
419 | case 8: | |
420 | /* Default, nothing to do. */ | |
421 | break; | |
422 | case 16: | |
423 | PATCH_INSN(num_context_patch1_16, | |
424 | num_context_patch1); | |
425 | break; | |
426 | default: | |
427 | prom_printf("Unhandled number of contexts: %d\n", | |
428 | num_contexts); | |
429 | prom_halt(); | |
430 | }; | |
431 | ||
432 | if (sun4c_vacinfo.do_hwflushes != 0) { | |
433 | PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1); | |
434 | PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2); | |
435 | } else { | |
436 | switch (sun4c_vacinfo.linesize) { | |
437 | case 16: | |
438 | /* Default, nothing to do. */ | |
439 | break; | |
440 | case 32: | |
441 | PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch); | |
442 | break; | |
443 | default: | |
444 | prom_printf("Impossible VAC linesize %d, halting...\n", | |
445 | sun4c_vacinfo.linesize); | |
446 | prom_halt(); | |
447 | }; | |
448 | } | |
449 | } | |
450 | ||
451 | static void __init sun4c_probe_mmu(void) | |
452 | { | |
453 | if (ARCH_SUN4) { | |
454 | switch (idprom->id_machtype) { | |
455 | case (SM_SUN4|SM_4_110): | |
456 | prom_printf("No support for 4100 yet\n"); | |
457 | prom_halt(); | |
458 | num_segmaps = 256; | |
459 | num_contexts = 8; | |
460 | break; | |
461 | ||
462 | case (SM_SUN4|SM_4_260): | |
463 | /* should be 512 segmaps. when it get fixed */ | |
464 | num_segmaps = 256; | |
465 | num_contexts = 16; | |
466 | break; | |
467 | ||
468 | case (SM_SUN4|SM_4_330): | |
469 | num_segmaps = 256; | |
470 | num_contexts = 16; | |
471 | break; | |
472 | ||
473 | case (SM_SUN4|SM_4_470): | |
474 | /* should be 1024 segmaps. when it get fixed */ | |
475 | num_segmaps = 256; | |
476 | num_contexts = 64; | |
477 | break; | |
478 | default: | |
479 | prom_printf("Invalid SUN4 model\n"); | |
480 | prom_halt(); | |
481 | }; | |
482 | } else { | |
483 | if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) || | |
484 | (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) { | |
485 | /* Hardcode these just to be safe, PROM on SS1 does | |
486 | * not have this info available in the root node. | |
487 | */ | |
488 | num_segmaps = 128; | |
489 | num_contexts = 8; | |
490 | } else { | |
491 | num_segmaps = | |
492 | prom_getintdefault(prom_root_node, "mmu-npmg", 128); | |
493 | num_contexts = | |
494 | prom_getintdefault(prom_root_node, "mmu-nctx", 0x8); | |
495 | } | |
496 | } | |
497 | patch_kernel_fault_handler(); | |
498 | } | |
499 | ||
500 | volatile unsigned long *sun4c_memerr_reg = NULL; | |
501 | ||
502 | void __init sun4c_probe_memerr_reg(void) | |
503 | { | |
504 | int node; | |
505 | struct linux_prom_registers regs[1]; | |
506 | ||
507 | if (ARCH_SUN4) { | |
508 | sun4c_memerr_reg = ioremap(sun4_memreg_physaddr, PAGE_SIZE); | |
509 | } else { | |
510 | node = prom_getchild(prom_root_node); | |
511 | node = prom_searchsiblings(prom_root_node, "memory-error"); | |
512 | if (!node) | |
513 | return; | |
514 | if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0) | |
515 | return; | |
516 | /* hmm I think regs[0].which_io is zero here anyways */ | |
517 | sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size); | |
518 | } | |
519 | } | |
520 | ||
521 | static inline void sun4c_init_ss2_cache_bug(void) | |
522 | { | |
523 | extern unsigned long start; | |
524 | ||
525 | if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) || | |
526 | (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) || | |
527 | (idprom->id_machtype == (SM_SUN4 | SM_4_330)) || | |
528 | (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) { | |
529 | /* Whee.. */ | |
530 | printk("SS2 cache bug detected, uncaching trap table page\n"); | |
531 | sun4c_flush_page((unsigned int) &start); | |
532 | sun4c_put_pte(((unsigned long) &start), | |
533 | (sun4c_get_pte((unsigned long) &start) | _SUN4C_PAGE_NOCACHE)); | |
534 | } | |
535 | } | |
536 | ||
537 | /* Addr is always aligned on a page boundary for us already. */ | |
538 | static int sun4c_map_dma_area(dma_addr_t *pba, unsigned long va, | |
539 | unsigned long addr, int len) | |
540 | { | |
541 | unsigned long page, end; | |
542 | ||
543 | *pba = addr; | |
544 | ||
545 | end = PAGE_ALIGN((addr + len)); | |
546 | while (addr < end) { | |
547 | page = va; | |
548 | sun4c_flush_page(page); | |
549 | page -= PAGE_OFFSET; | |
550 | page >>= PAGE_SHIFT; | |
551 | page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY | | |
552 | _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV); | |
553 | sun4c_put_pte(addr, page); | |
554 | addr += PAGE_SIZE; | |
555 | va += PAGE_SIZE; | |
556 | } | |
557 | ||
558 | return 0; | |
559 | } | |
560 | ||
561 | static struct page *sun4c_translate_dvma(unsigned long busa) | |
562 | { | |
563 | /* Fortunately for us, bus_addr == uncached_virt in sun4c. */ | |
564 | unsigned long pte = sun4c_get_pte(busa); | |
565 | return pfn_to_page(pte & SUN4C_PFN_MASK); | |
566 | } | |
567 | ||
568 | static void sun4c_unmap_dma_area(unsigned long busa, int len) | |
569 | { | |
570 | /* Fortunately for us, bus_addr == uncached_virt in sun4c. */ | |
571 | /* XXX Implement this */ | |
572 | } | |
573 | ||
574 | /* TLB management. */ | |
575 | ||
576 | /* Don't change this struct without changing entry.S. This is used | |
577 | * in the in-window kernel fault handler, and you don't want to mess | |
578 | * with that. (See sun4c_fault in entry.S). | |
579 | */ | |
580 | struct sun4c_mmu_entry { | |
581 | struct sun4c_mmu_entry *next; | |
582 | struct sun4c_mmu_entry *prev; | |
583 | unsigned long vaddr; | |
584 | unsigned char pseg; | |
585 | unsigned char locked; | |
586 | ||
587 | /* For user mappings only, and completely hidden from kernel | |
588 | * TLB miss code. | |
589 | */ | |
590 | unsigned char ctx; | |
591 | struct sun4c_mmu_entry *lru_next; | |
592 | struct sun4c_mmu_entry *lru_prev; | |
593 | }; | |
594 | ||
595 | static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS]; | |
596 | ||
597 | static void __init sun4c_init_mmu_entry_pool(void) | |
598 | { | |
599 | int i; | |
600 | ||
601 | for (i=0; i < SUN4C_MAX_SEGMAPS; i++) { | |
602 | mmu_entry_pool[i].pseg = i; | |
603 | mmu_entry_pool[i].next = NULL; | |
604 | mmu_entry_pool[i].prev = NULL; | |
605 | mmu_entry_pool[i].vaddr = 0; | |
606 | mmu_entry_pool[i].locked = 0; | |
607 | mmu_entry_pool[i].ctx = 0; | |
608 | mmu_entry_pool[i].lru_next = NULL; | |
609 | mmu_entry_pool[i].lru_prev = NULL; | |
610 | } | |
611 | mmu_entry_pool[invalid_segment].locked = 1; | |
612 | } | |
613 | ||
614 | static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on, | |
615 | unsigned long bits_off) | |
616 | { | |
617 | unsigned long start, end; | |
618 | ||
619 | end = vaddr + SUN4C_REAL_PGDIR_SIZE; | |
620 | for (start = vaddr; start < end; start += PAGE_SIZE) | |
621 | if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID) | |
622 | sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) & | |
623 | ~bits_off); | |
624 | } | |
625 | ||
626 | static inline void sun4c_init_map_kernelprom(unsigned long kernel_end) | |
627 | { | |
628 | unsigned long vaddr; | |
629 | unsigned char pseg, ctx; | |
630 | #ifdef CONFIG_SUN4 | |
631 | /* sun4/110 and 260 have no kadb. */ | |
632 | if ((idprom->id_machtype != (SM_SUN4 | SM_4_260)) && | |
633 | (idprom->id_machtype != (SM_SUN4 | SM_4_110))) { | |
634 | #endif | |
635 | for (vaddr = KADB_DEBUGGER_BEGVM; | |
636 | vaddr < LINUX_OPPROM_ENDVM; | |
637 | vaddr += SUN4C_REAL_PGDIR_SIZE) { | |
638 | pseg = sun4c_get_segmap(vaddr); | |
639 | if (pseg != invalid_segment) { | |
640 | mmu_entry_pool[pseg].locked = 1; | |
641 | for (ctx = 0; ctx < num_contexts; ctx++) | |
642 | prom_putsegment(ctx, vaddr, pseg); | |
643 | fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0); | |
644 | } | |
645 | } | |
646 | #ifdef CONFIG_SUN4 | |
647 | } | |
648 | #endif | |
649 | for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) { | |
650 | pseg = sun4c_get_segmap(vaddr); | |
651 | mmu_entry_pool[pseg].locked = 1; | |
652 | for (ctx = 0; ctx < num_contexts; ctx++) | |
653 | prom_putsegment(ctx, vaddr, pseg); | |
654 | fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE); | |
655 | } | |
656 | } | |
657 | ||
658 | static void __init sun4c_init_lock_area(unsigned long start, unsigned long end) | |
659 | { | |
660 | int i, ctx; | |
661 | ||
662 | while (start < end) { | |
663 | for (i = 0; i < invalid_segment; i++) | |
664 | if (!mmu_entry_pool[i].locked) | |
665 | break; | |
666 | mmu_entry_pool[i].locked = 1; | |
667 | sun4c_init_clean_segmap(i); | |
668 | for (ctx = 0; ctx < num_contexts; ctx++) | |
669 | prom_putsegment(ctx, start, mmu_entry_pool[i].pseg); | |
670 | start += SUN4C_REAL_PGDIR_SIZE; | |
671 | } | |
672 | } | |
673 | ||
674 | /* Don't change this struct without changing entry.S. This is used | |
675 | * in the in-window kernel fault handler, and you don't want to mess | |
676 | * with that. (See sun4c_fault in entry.S). | |
677 | */ | |
678 | struct sun4c_mmu_ring { | |
679 | struct sun4c_mmu_entry ringhd; | |
680 | int num_entries; | |
681 | }; | |
682 | ||
683 | static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */ | |
684 | static struct sun4c_mmu_ring sun4c_ufree_ring; /* free user entries */ | |
685 | static struct sun4c_mmu_ring sun4c_ulru_ring; /* LRU user entries */ | |
686 | struct sun4c_mmu_ring sun4c_kernel_ring; /* used kernel entries */ | |
687 | struct sun4c_mmu_ring sun4c_kfree_ring; /* free kernel entries */ | |
688 | ||
689 | static inline void sun4c_init_rings(void) | |
690 | { | |
691 | int i; | |
692 | ||
693 | for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) { | |
694 | sun4c_context_ring[i].ringhd.next = | |
695 | sun4c_context_ring[i].ringhd.prev = | |
696 | &sun4c_context_ring[i].ringhd; | |
697 | sun4c_context_ring[i].num_entries = 0; | |
698 | } | |
699 | sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev = | |
700 | &sun4c_ufree_ring.ringhd; | |
701 | sun4c_ufree_ring.num_entries = 0; | |
702 | sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev = | |
703 | &sun4c_ulru_ring.ringhd; | |
704 | sun4c_ulru_ring.num_entries = 0; | |
705 | sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev = | |
706 | &sun4c_kernel_ring.ringhd; | |
707 | sun4c_kernel_ring.num_entries = 0; | |
708 | sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev = | |
709 | &sun4c_kfree_ring.ringhd; | |
710 | sun4c_kfree_ring.num_entries = 0; | |
711 | } | |
712 | ||
713 | static void add_ring(struct sun4c_mmu_ring *ring, | |
714 | struct sun4c_mmu_entry *entry) | |
715 | { | |
716 | struct sun4c_mmu_entry *head = &ring->ringhd; | |
717 | ||
718 | entry->prev = head; | |
719 | (entry->next = head->next)->prev = entry; | |
720 | head->next = entry; | |
721 | ring->num_entries++; | |
722 | } | |
723 | ||
724 | static __inline__ void add_lru(struct sun4c_mmu_entry *entry) | |
725 | { | |
726 | struct sun4c_mmu_ring *ring = &sun4c_ulru_ring; | |
727 | struct sun4c_mmu_entry *head = &ring->ringhd; | |
728 | ||
729 | entry->lru_next = head; | |
730 | (entry->lru_prev = head->lru_prev)->lru_next = entry; | |
731 | head->lru_prev = entry; | |
732 | } | |
733 | ||
734 | static void add_ring_ordered(struct sun4c_mmu_ring *ring, | |
735 | struct sun4c_mmu_entry *entry) | |
736 | { | |
737 | struct sun4c_mmu_entry *head = &ring->ringhd; | |
738 | unsigned long addr = entry->vaddr; | |
739 | ||
740 | while ((head->next != &ring->ringhd) && (head->next->vaddr < addr)) | |
741 | head = head->next; | |
742 | ||
743 | entry->prev = head; | |
744 | (entry->next = head->next)->prev = entry; | |
745 | head->next = entry; | |
746 | ring->num_entries++; | |
747 | ||
748 | add_lru(entry); | |
749 | } | |
750 | ||
751 | static __inline__ void remove_ring(struct sun4c_mmu_ring *ring, | |
752 | struct sun4c_mmu_entry *entry) | |
753 | { | |
754 | struct sun4c_mmu_entry *next = entry->next; | |
755 | ||
756 | (next->prev = entry->prev)->next = next; | |
757 | ring->num_entries--; | |
758 | } | |
759 | ||
760 | static void remove_lru(struct sun4c_mmu_entry *entry) | |
761 | { | |
762 | struct sun4c_mmu_entry *next = entry->lru_next; | |
763 | ||
764 | (next->lru_prev = entry->lru_prev)->lru_next = next; | |
765 | } | |
766 | ||
767 | static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry) | |
768 | { | |
769 | remove_ring(sun4c_context_ring+ctx, entry); | |
770 | remove_lru(entry); | |
771 | add_ring(&sun4c_ufree_ring, entry); | |
772 | } | |
773 | ||
774 | static void free_kernel_entry(struct sun4c_mmu_entry *entry, | |
775 | struct sun4c_mmu_ring *ring) | |
776 | { | |
777 | remove_ring(ring, entry); | |
778 | add_ring(&sun4c_kfree_ring, entry); | |
779 | } | |
780 | ||
781 | static void __init sun4c_init_fill_kernel_ring(int howmany) | |
782 | { | |
783 | int i; | |
784 | ||
785 | while (howmany) { | |
786 | for (i = 0; i < invalid_segment; i++) | |
787 | if (!mmu_entry_pool[i].locked) | |
788 | break; | |
789 | mmu_entry_pool[i].locked = 1; | |
790 | sun4c_init_clean_segmap(i); | |
791 | add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]); | |
792 | howmany--; | |
793 | } | |
794 | } | |
795 | ||
796 | static void __init sun4c_init_fill_user_ring(void) | |
797 | { | |
798 | int i; | |
799 | ||
800 | for (i = 0; i < invalid_segment; i++) { | |
801 | if (mmu_entry_pool[i].locked) | |
802 | continue; | |
803 | sun4c_init_clean_segmap(i); | |
804 | add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]); | |
805 | } | |
806 | } | |
807 | ||
808 | static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry) | |
809 | { | |
810 | int savectx, ctx; | |
811 | ||
812 | savectx = sun4c_get_context(); | |
813 | for (ctx = 0; ctx < num_contexts; ctx++) { | |
814 | sun4c_set_context(ctx); | |
815 | sun4c_put_segmap(kentry->vaddr, invalid_segment); | |
816 | } | |
817 | sun4c_set_context(savectx); | |
818 | } | |
819 | ||
820 | static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry) | |
821 | { | |
822 | int savectx, ctx; | |
823 | ||
824 | savectx = sun4c_get_context(); | |
825 | for (ctx = 0; ctx < num_contexts; ctx++) { | |
826 | sun4c_set_context(ctx); | |
827 | sun4c_put_segmap(kentry->vaddr, kentry->pseg); | |
828 | } | |
829 | sun4c_set_context(savectx); | |
830 | } | |
831 | ||
832 | #define sun4c_user_unmap(__entry) \ | |
833 | sun4c_put_segmap((__entry)->vaddr, invalid_segment) | |
834 | ||
835 | static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx) | |
836 | { | |
837 | struct sun4c_mmu_entry *head = &crp->ringhd; | |
838 | unsigned long flags; | |
839 | ||
840 | local_irq_save(flags); | |
841 | if (head->next != head) { | |
842 | struct sun4c_mmu_entry *entry = head->next; | |
843 | int savectx = sun4c_get_context(); | |
844 | ||
845 | flush_user_windows(); | |
846 | sun4c_set_context(ctx); | |
847 | sun4c_flush_context(); | |
848 | do { | |
849 | struct sun4c_mmu_entry *next = entry->next; | |
850 | ||
851 | sun4c_user_unmap(entry); | |
852 | free_user_entry(ctx, entry); | |
853 | ||
854 | entry = next; | |
855 | } while (entry != head); | |
856 | sun4c_set_context(savectx); | |
857 | } | |
858 | local_irq_restore(flags); | |
859 | } | |
860 | ||
861 | static int sun4c_user_taken_entries; /* This is how much we have. */ | |
862 | static int max_user_taken_entries; /* This limits us and prevents deadlock. */ | |
863 | ||
864 | static struct sun4c_mmu_entry *sun4c_kernel_strategy(void) | |
865 | { | |
866 | struct sun4c_mmu_entry *this_entry; | |
867 | ||
868 | /* If some are free, return first one. */ | |
869 | if (sun4c_kfree_ring.num_entries) { | |
870 | this_entry = sun4c_kfree_ring.ringhd.next; | |
871 | return this_entry; | |
872 | } | |
873 | ||
874 | /* Else free one up. */ | |
875 | this_entry = sun4c_kernel_ring.ringhd.prev; | |
876 | sun4c_flush_segment(this_entry->vaddr); | |
877 | sun4c_kernel_unmap(this_entry); | |
878 | free_kernel_entry(this_entry, &sun4c_kernel_ring); | |
879 | this_entry = sun4c_kfree_ring.ringhd.next; | |
880 | ||
881 | return this_entry; | |
882 | } | |
883 | ||
884 | /* Using this method to free up mmu entries eliminates a lot of | |
885 | * potential races since we have a kernel that incurs tlb | |
886 | * replacement faults. There may be performance penalties. | |
887 | * | |
888 | * NOTE: Must be called with interrupts disabled. | |
889 | */ | |
890 | static struct sun4c_mmu_entry *sun4c_user_strategy(void) | |
891 | { | |
892 | struct sun4c_mmu_entry *entry; | |
893 | unsigned char ctx; | |
894 | int savectx; | |
895 | ||
896 | /* If some are free, return first one. */ | |
897 | if (sun4c_ufree_ring.num_entries) { | |
898 | entry = sun4c_ufree_ring.ringhd.next; | |
899 | goto unlink_out; | |
900 | } | |
901 | ||
902 | if (sun4c_user_taken_entries) { | |
903 | entry = sun4c_kernel_strategy(); | |
904 | sun4c_user_taken_entries--; | |
905 | goto kunlink_out; | |
906 | } | |
907 | ||
908 | /* Grab from the beginning of the LRU list. */ | |
909 | entry = sun4c_ulru_ring.ringhd.lru_next; | |
910 | ctx = entry->ctx; | |
911 | ||
912 | savectx = sun4c_get_context(); | |
913 | flush_user_windows(); | |
914 | sun4c_set_context(ctx); | |
915 | sun4c_flush_segment(entry->vaddr); | |
916 | sun4c_user_unmap(entry); | |
917 | remove_ring(sun4c_context_ring + ctx, entry); | |
918 | remove_lru(entry); | |
919 | sun4c_set_context(savectx); | |
920 | ||
921 | return entry; | |
922 | ||
923 | unlink_out: | |
924 | remove_ring(&sun4c_ufree_ring, entry); | |
925 | return entry; | |
926 | kunlink_out: | |
927 | remove_ring(&sun4c_kfree_ring, entry); | |
928 | return entry; | |
929 | } | |
930 | ||
931 | /* NOTE: Must be called with interrupts disabled. */ | |
932 | void sun4c_grow_kernel_ring(void) | |
933 | { | |
934 | struct sun4c_mmu_entry *entry; | |
935 | ||
936 | /* Prevent deadlock condition. */ | |
937 | if (sun4c_user_taken_entries >= max_user_taken_entries) | |
938 | return; | |
939 | ||
940 | if (sun4c_ufree_ring.num_entries) { | |
941 | entry = sun4c_ufree_ring.ringhd.next; | |
942 | remove_ring(&sun4c_ufree_ring, entry); | |
943 | add_ring(&sun4c_kfree_ring, entry); | |
944 | sun4c_user_taken_entries++; | |
945 | } | |
946 | } | |
947 | ||
948 | /* 2 page buckets for task struct and kernel stack allocation. | |
949 | * | |
950 | * TASK_STACK_BEGIN | |
951 | * bucket[0] | |
952 | * bucket[1] | |
953 | * [ ... ] | |
954 | * bucket[NR_TASK_BUCKETS-1] | |
955 | * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS) | |
956 | * | |
957 | * Each slot looks like: | |
958 | * | |
959 | * page 1 -- task struct + beginning of kernel stack | |
960 | * page 2 -- rest of kernel stack | |
961 | */ | |
962 | ||
963 | union task_union *sun4c_bucket[NR_TASK_BUCKETS]; | |
964 | ||
965 | static int sun4c_lowbucket_avail; | |
966 | ||
967 | #define BUCKET_EMPTY ((union task_union *) 0) | |
968 | #define BUCKET_SHIFT (PAGE_SHIFT + 1) /* log2(sizeof(struct task_bucket)) */ | |
969 | #define BUCKET_SIZE (1 << BUCKET_SHIFT) | |
970 | #define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT)) | |
971 | #define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR) | |
972 | #define BUCKET_PTE(page) \ | |
973 | ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL)) | |
974 | #define BUCKET_PTE_PAGE(pte) \ | |
975 | (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT)) | |
976 | ||
977 | static void get_locked_segment(unsigned long addr) | |
978 | { | |
979 | struct sun4c_mmu_entry *stolen; | |
980 | unsigned long flags; | |
981 | ||
982 | local_irq_save(flags); | |
983 | addr &= SUN4C_REAL_PGDIR_MASK; | |
984 | stolen = sun4c_user_strategy(); | |
985 | max_user_taken_entries--; | |
986 | stolen->vaddr = addr; | |
987 | flush_user_windows(); | |
988 | sun4c_kernel_map(stolen); | |
989 | local_irq_restore(flags); | |
990 | } | |
991 | ||
992 | static void free_locked_segment(unsigned long addr) | |
993 | { | |
994 | struct sun4c_mmu_entry *entry; | |
995 | unsigned long flags; | |
996 | unsigned char pseg; | |
997 | ||
998 | local_irq_save(flags); | |
999 | addr &= SUN4C_REAL_PGDIR_MASK; | |
1000 | pseg = sun4c_get_segmap(addr); | |
1001 | entry = &mmu_entry_pool[pseg]; | |
1002 | ||
1003 | flush_user_windows(); | |
1004 | sun4c_flush_segment(addr); | |
1005 | sun4c_kernel_unmap(entry); | |
1006 | add_ring(&sun4c_ufree_ring, entry); | |
1007 | max_user_taken_entries++; | |
1008 | local_irq_restore(flags); | |
1009 | } | |
1010 | ||
1011 | static inline void garbage_collect(int entry) | |
1012 | { | |
1013 | int start, end; | |
1014 | ||
1015 | /* 32 buckets per segment... */ | |
1016 | entry &= ~31; | |
1017 | start = entry; | |
1018 | for (end = (start + 32); start < end; start++) | |
1019 | if (sun4c_bucket[start] != BUCKET_EMPTY) | |
1020 | return; | |
1021 | ||
1022 | /* Entire segment empty, release it. */ | |
1023 | free_locked_segment(BUCKET_ADDR(entry)); | |
1024 | } | |
1025 | ||
1026 | static struct thread_info *sun4c_alloc_thread_info(void) | |
1027 | { | |
1028 | unsigned long addr, pages; | |
1029 | int entry; | |
1030 | ||
1031 | pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER); | |
1032 | if (!pages) | |
1033 | return NULL; | |
1034 | ||
1035 | for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++) | |
1036 | if (sun4c_bucket[entry] == BUCKET_EMPTY) | |
1037 | break; | |
1038 | if (entry == NR_TASK_BUCKETS) { | |
1039 | free_pages(pages, THREAD_INFO_ORDER); | |
1040 | return NULL; | |
1041 | } | |
1042 | if (entry >= sun4c_lowbucket_avail) | |
1043 | sun4c_lowbucket_avail = entry + 1; | |
1044 | ||
1045 | addr = BUCKET_ADDR(entry); | |
1046 | sun4c_bucket[entry] = (union task_union *) addr; | |
1047 | if(sun4c_get_segmap(addr) == invalid_segment) | |
1048 | get_locked_segment(addr); | |
1049 | ||
1050 | /* We are changing the virtual color of the page(s) | |
1051 | * so we must flush the cache to guarantee consistency. | |
1052 | */ | |
1053 | sun4c_flush_page(pages); | |
1054 | #ifndef CONFIG_SUN4 | |
1055 | sun4c_flush_page(pages + PAGE_SIZE); | |
1056 | #endif | |
1057 | ||
1058 | sun4c_put_pte(addr, BUCKET_PTE(pages)); | |
1059 | #ifndef CONFIG_SUN4 | |
1060 | sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE)); | |
1061 | #endif | |
1062 | ||
1063 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
1064 | memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER); | |
1065 | #endif /* DEBUG_STACK_USAGE */ | |
1066 | ||
1067 | return (struct thread_info *) addr; | |
1068 | } | |
1069 | ||
1070 | static void sun4c_free_thread_info(struct thread_info *ti) | |
1071 | { | |
1072 | unsigned long tiaddr = (unsigned long) ti; | |
1073 | unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr)); | |
1074 | int entry = BUCKET_NUM(tiaddr); | |
1075 | ||
1076 | /* We are deleting a mapping, so the flush here is mandatory. */ | |
1077 | sun4c_flush_page(tiaddr); | |
1078 | #ifndef CONFIG_SUN4 | |
1079 | sun4c_flush_page(tiaddr + PAGE_SIZE); | |
1080 | #endif | |
1081 | sun4c_put_pte(tiaddr, 0); | |
1082 | #ifndef CONFIG_SUN4 | |
1083 | sun4c_put_pte(tiaddr + PAGE_SIZE, 0); | |
1084 | #endif | |
1085 | sun4c_bucket[entry] = BUCKET_EMPTY; | |
1086 | if (entry < sun4c_lowbucket_avail) | |
1087 | sun4c_lowbucket_avail = entry; | |
1088 | ||
1089 | free_pages(pages, THREAD_INFO_ORDER); | |
1090 | garbage_collect(entry); | |
1091 | } | |
1092 | ||
1093 | static void __init sun4c_init_buckets(void) | |
1094 | { | |
1095 | int entry; | |
1096 | ||
1097 | if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) { | |
1098 | extern void thread_info_size_is_bolixed_pete(void); | |
1099 | thread_info_size_is_bolixed_pete(); | |
1100 | } | |
1101 | ||
1102 | for (entry = 0; entry < NR_TASK_BUCKETS; entry++) | |
1103 | sun4c_bucket[entry] = BUCKET_EMPTY; | |
1104 | sun4c_lowbucket_avail = 0; | |
1105 | } | |
1106 | ||
1107 | static unsigned long sun4c_iobuffer_start; | |
1108 | static unsigned long sun4c_iobuffer_end; | |
1109 | static unsigned long sun4c_iobuffer_high; | |
1110 | static unsigned long *sun4c_iobuffer_map; | |
1111 | static int iobuffer_map_size; | |
1112 | ||
1113 | /* | |
1114 | * Alias our pages so they do not cause a trap. | |
1115 | * Also one page may be aliased into several I/O areas and we may | |
1116 | * finish these I/O separately. | |
1117 | */ | |
1118 | static char *sun4c_lockarea(char *vaddr, unsigned long size) | |
1119 | { | |
1120 | unsigned long base, scan; | |
1121 | unsigned long npages; | |
1122 | unsigned long vpage; | |
1123 | unsigned long pte; | |
1124 | unsigned long apage; | |
1125 | unsigned long high; | |
1126 | unsigned long flags; | |
1127 | ||
1128 | npages = (((unsigned long)vaddr & ~PAGE_MASK) + | |
1129 | size + (PAGE_SIZE-1)) >> PAGE_SHIFT; | |
1130 | ||
1131 | scan = 0; | |
1132 | local_irq_save(flags); | |
1133 | for (;;) { | |
1134 | scan = find_next_zero_bit(sun4c_iobuffer_map, | |
1135 | iobuffer_map_size, scan); | |
1136 | if ((base = scan) + npages > iobuffer_map_size) goto abend; | |
1137 | for (;;) { | |
1138 | if (scan >= base + npages) goto found; | |
1139 | if (test_bit(scan, sun4c_iobuffer_map)) break; | |
1140 | scan++; | |
1141 | } | |
1142 | } | |
1143 | ||
1144 | found: | |
1145 | high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start; | |
1146 | high = SUN4C_REAL_PGDIR_ALIGN(high); | |
1147 | while (high > sun4c_iobuffer_high) { | |
1148 | get_locked_segment(sun4c_iobuffer_high); | |
1149 | sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE; | |
1150 | } | |
1151 | ||
1152 | vpage = ((unsigned long) vaddr) & PAGE_MASK; | |
1153 | for (scan = base; scan < base+npages; scan++) { | |
1154 | pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT); | |
1155 | pte |= pgprot_val(SUN4C_PAGE_KERNEL); | |
1156 | pte |= _SUN4C_PAGE_NOCACHE; | |
1157 | set_bit(scan, sun4c_iobuffer_map); | |
1158 | apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start; | |
1159 | ||
1160 | /* Flush original mapping so we see the right things later. */ | |
1161 | sun4c_flush_page(vpage); | |
1162 | ||
1163 | sun4c_put_pte(apage, pte); | |
1164 | vpage += PAGE_SIZE; | |
1165 | } | |
1166 | local_irq_restore(flags); | |
1167 | return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start + | |
1168 | (((unsigned long) vaddr) & ~PAGE_MASK)); | |
1169 | ||
1170 | abend: | |
1171 | local_irq_restore(flags); | |
1172 | printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size); | |
1173 | panic("Out of iobuffer table"); | |
1174 | return NULL; | |
1175 | } | |
1176 | ||
1177 | static void sun4c_unlockarea(char *vaddr, unsigned long size) | |
1178 | { | |
1179 | unsigned long vpage, npages; | |
1180 | unsigned long flags; | |
1181 | int scan, high; | |
1182 | ||
1183 | vpage = (unsigned long)vaddr & PAGE_MASK; | |
1184 | npages = (((unsigned long)vaddr & ~PAGE_MASK) + | |
1185 | size + (PAGE_SIZE-1)) >> PAGE_SHIFT; | |
1186 | ||
1187 | local_irq_save(flags); | |
1188 | while (npages != 0) { | |
1189 | --npages; | |
1190 | ||
1191 | /* This mapping is marked non-cachable, no flush necessary. */ | |
1192 | sun4c_put_pte(vpage, 0); | |
1193 | clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT, | |
1194 | sun4c_iobuffer_map); | |
1195 | vpage += PAGE_SIZE; | |
1196 | } | |
1197 | ||
1198 | /* garbage collect */ | |
1199 | scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT; | |
1200 | while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5]) | |
1201 | scan -= 32; | |
1202 | scan += 32; | |
1203 | high = sun4c_iobuffer_start + (scan << PAGE_SHIFT); | |
1204 | high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE; | |
1205 | while (high < sun4c_iobuffer_high) { | |
1206 | sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE; | |
1207 | free_locked_segment(sun4c_iobuffer_high); | |
1208 | } | |
1209 | local_irq_restore(flags); | |
1210 | } | |
1211 | ||
1212 | /* Note the scsi code at init time passes to here buffers | |
1213 | * which sit on the kernel stack, those are already locked | |
1214 | * by implication and fool the page locking code above | |
1215 | * if passed to by mistake. | |
1216 | */ | |
1217 | static __u32 sun4c_get_scsi_one(char *bufptr, unsigned long len, struct sbus_bus *sbus) | |
1218 | { | |
1219 | unsigned long page; | |
1220 | ||
1221 | page = ((unsigned long)bufptr) & PAGE_MASK; | |
1222 | if (!virt_addr_valid(page)) { | |
1223 | sun4c_flush_page(page); | |
1224 | return (__u32)bufptr; /* already locked */ | |
1225 | } | |
1226 | return (__u32)sun4c_lockarea(bufptr, len); | |
1227 | } | |
1228 | ||
1229 | static void sun4c_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus) | |
1230 | { | |
1231 | while (sz != 0) { | |
1232 | --sz; | |
1233 | sg[sz].dvma_address = (__u32)sun4c_lockarea(page_address(sg[sz].page) + sg[sz].offset, sg[sz].length); | |
1234 | sg[sz].dvma_length = sg[sz].length; | |
1235 | } | |
1236 | } | |
1237 | ||
1238 | static void sun4c_release_scsi_one(__u32 bufptr, unsigned long len, struct sbus_bus *sbus) | |
1239 | { | |
1240 | if (bufptr < sun4c_iobuffer_start) | |
1241 | return; /* On kernel stack or similar, see above */ | |
1242 | sun4c_unlockarea((char *)bufptr, len); | |
1243 | } | |
1244 | ||
1245 | static void sun4c_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus) | |
1246 | { | |
1247 | while (sz != 0) { | |
1248 | --sz; | |
1249 | sun4c_unlockarea((char *)sg[sz].dvma_address, sg[sz].length); | |
1250 | } | |
1251 | } | |
1252 | ||
1253 | #define TASK_ENTRY_SIZE BUCKET_SIZE /* see above */ | |
1254 | #define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1)) | |
1255 | ||
1256 | struct vm_area_struct sun4c_kstack_vma; | |
1257 | ||
1258 | static void __init sun4c_init_lock_areas(void) | |
1259 | { | |
1260 | unsigned long sun4c_taskstack_start; | |
1261 | unsigned long sun4c_taskstack_end; | |
1262 | int bitmap_size; | |
1263 | ||
1264 | sun4c_init_buckets(); | |
1265 | sun4c_taskstack_start = SUN4C_LOCK_VADDR; | |
1266 | sun4c_taskstack_end = (sun4c_taskstack_start + | |
1267 | (TASK_ENTRY_SIZE * NR_TASK_BUCKETS)); | |
1268 | if (sun4c_taskstack_end >= SUN4C_LOCK_END) { | |
1269 | prom_printf("Too many tasks, decrease NR_TASK_BUCKETS please.\n"); | |
1270 | prom_halt(); | |
1271 | } | |
1272 | ||
1273 | sun4c_iobuffer_start = sun4c_iobuffer_high = | |
1274 | SUN4C_REAL_PGDIR_ALIGN(sun4c_taskstack_end); | |
1275 | sun4c_iobuffer_end = SUN4C_LOCK_END; | |
1276 | bitmap_size = (sun4c_iobuffer_end - sun4c_iobuffer_start) >> PAGE_SHIFT; | |
1277 | bitmap_size = (bitmap_size + 7) >> 3; | |
1278 | bitmap_size = LONG_ALIGN(bitmap_size); | |
1279 | iobuffer_map_size = bitmap_size << 3; | |
1280 | sun4c_iobuffer_map = __alloc_bootmem(bitmap_size, SMP_CACHE_BYTES, 0UL); | |
1281 | memset((void *) sun4c_iobuffer_map, 0, bitmap_size); | |
1282 | ||
1283 | sun4c_kstack_vma.vm_mm = &init_mm; | |
1284 | sun4c_kstack_vma.vm_start = sun4c_taskstack_start; | |
1285 | sun4c_kstack_vma.vm_end = sun4c_taskstack_end; | |
1286 | sun4c_kstack_vma.vm_page_prot = PAGE_SHARED; | |
1287 | sun4c_kstack_vma.vm_flags = VM_READ | VM_WRITE | VM_EXEC; | |
1288 | insert_vm_struct(&init_mm, &sun4c_kstack_vma); | |
1289 | } | |
1290 | ||
1291 | /* Cache flushing on the sun4c. */ | |
1292 | static void sun4c_flush_cache_all(void) | |
1293 | { | |
1294 | unsigned long begin, end; | |
1295 | ||
1296 | flush_user_windows(); | |
1297 | begin = (KERNBASE + SUN4C_REAL_PGDIR_SIZE); | |
1298 | end = (begin + SUN4C_VAC_SIZE); | |
1299 | ||
1300 | if (sun4c_vacinfo.linesize == 32) { | |
1301 | while (begin < end) { | |
1302 | __asm__ __volatile__( | |
1303 | "ld [%0 + 0x00], %%g0\n\t" | |
1304 | "ld [%0 + 0x20], %%g0\n\t" | |
1305 | "ld [%0 + 0x40], %%g0\n\t" | |
1306 | "ld [%0 + 0x60], %%g0\n\t" | |
1307 | "ld [%0 + 0x80], %%g0\n\t" | |
1308 | "ld [%0 + 0xa0], %%g0\n\t" | |
1309 | "ld [%0 + 0xc0], %%g0\n\t" | |
1310 | "ld [%0 + 0xe0], %%g0\n\t" | |
1311 | "ld [%0 + 0x100], %%g0\n\t" | |
1312 | "ld [%0 + 0x120], %%g0\n\t" | |
1313 | "ld [%0 + 0x140], %%g0\n\t" | |
1314 | "ld [%0 + 0x160], %%g0\n\t" | |
1315 | "ld [%0 + 0x180], %%g0\n\t" | |
1316 | "ld [%0 + 0x1a0], %%g0\n\t" | |
1317 | "ld [%0 + 0x1c0], %%g0\n\t" | |
1318 | "ld [%0 + 0x1e0], %%g0\n" | |
1319 | : : "r" (begin)); | |
1320 | begin += 512; | |
1321 | } | |
1322 | } else { | |
1323 | while (begin < end) { | |
1324 | __asm__ __volatile__( | |
1325 | "ld [%0 + 0x00], %%g0\n\t" | |
1326 | "ld [%0 + 0x10], %%g0\n\t" | |
1327 | "ld [%0 + 0x20], %%g0\n\t" | |
1328 | "ld [%0 + 0x30], %%g0\n\t" | |
1329 | "ld [%0 + 0x40], %%g0\n\t" | |
1330 | "ld [%0 + 0x50], %%g0\n\t" | |
1331 | "ld [%0 + 0x60], %%g0\n\t" | |
1332 | "ld [%0 + 0x70], %%g0\n\t" | |
1333 | "ld [%0 + 0x80], %%g0\n\t" | |
1334 | "ld [%0 + 0x90], %%g0\n\t" | |
1335 | "ld [%0 + 0xa0], %%g0\n\t" | |
1336 | "ld [%0 + 0xb0], %%g0\n\t" | |
1337 | "ld [%0 + 0xc0], %%g0\n\t" | |
1338 | "ld [%0 + 0xd0], %%g0\n\t" | |
1339 | "ld [%0 + 0xe0], %%g0\n\t" | |
1340 | "ld [%0 + 0xf0], %%g0\n" | |
1341 | : : "r" (begin)); | |
1342 | begin += 256; | |
1343 | } | |
1344 | } | |
1345 | } | |
1346 | ||
1347 | static void sun4c_flush_cache_mm(struct mm_struct *mm) | |
1348 | { | |
1349 | int new_ctx = mm->context; | |
1350 | ||
1351 | if (new_ctx != NO_CONTEXT) { | |
1352 | flush_user_windows(); | |
1353 | ||
1354 | if (sun4c_context_ring[new_ctx].num_entries) { | |
1355 | struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; | |
1356 | unsigned long flags; | |
1357 | ||
1358 | local_irq_save(flags); | |
1359 | if (head->next != head) { | |
1360 | struct sun4c_mmu_entry *entry = head->next; | |
1361 | int savectx = sun4c_get_context(); | |
1362 | ||
1363 | sun4c_set_context(new_ctx); | |
1364 | sun4c_flush_context(); | |
1365 | do { | |
1366 | struct sun4c_mmu_entry *next = entry->next; | |
1367 | ||
1368 | sun4c_user_unmap(entry); | |
1369 | free_user_entry(new_ctx, entry); | |
1370 | ||
1371 | entry = next; | |
1372 | } while (entry != head); | |
1373 | sun4c_set_context(savectx); | |
1374 | } | |
1375 | local_irq_restore(flags); | |
1376 | } | |
1377 | } | |
1378 | } | |
1379 | ||
1380 | static void sun4c_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) | |
1381 | { | |
1382 | struct mm_struct *mm = vma->vm_mm; | |
1383 | int new_ctx = mm->context; | |
1384 | ||
1385 | if (new_ctx != NO_CONTEXT) { | |
1386 | struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; | |
1387 | struct sun4c_mmu_entry *entry; | |
1388 | unsigned long flags; | |
1389 | ||
1390 | flush_user_windows(); | |
1391 | ||
1392 | local_irq_save(flags); | |
1393 | /* All user segmap chains are ordered on entry->vaddr. */ | |
1394 | for (entry = head->next; | |
1395 | (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start); | |
1396 | entry = entry->next) | |
1397 | ; | |
1398 | ||
1399 | /* Tracing various job mixtures showed that this conditional | |
1400 | * only passes ~35% of the time for most worse case situations, | |
1401 | * therefore we avoid all of this gross overhead ~65% of the time. | |
1402 | */ | |
1403 | if ((entry != head) && (entry->vaddr < end)) { | |
1404 | int octx = sun4c_get_context(); | |
1405 | sun4c_set_context(new_ctx); | |
1406 | ||
1407 | /* At this point, always, (start >= entry->vaddr) and | |
1408 | * (entry->vaddr < end), once the latter condition | |
1409 | * ceases to hold, or we hit the end of the list, we | |
1410 | * exit the loop. The ordering of all user allocated | |
1411 | * segmaps makes this all work out so beautifully. | |
1412 | */ | |
1413 | do { | |
1414 | struct sun4c_mmu_entry *next = entry->next; | |
1415 | unsigned long realend; | |
1416 | ||
1417 | /* "realstart" is always >= entry->vaddr */ | |
1418 | realend = entry->vaddr + SUN4C_REAL_PGDIR_SIZE; | |
1419 | if (end < realend) | |
1420 | realend = end; | |
1421 | if ((realend - entry->vaddr) <= (PAGE_SIZE << 3)) { | |
1422 | unsigned long page = entry->vaddr; | |
1423 | while (page < realend) { | |
1424 | sun4c_flush_page(page); | |
1425 | page += PAGE_SIZE; | |
1426 | } | |
1427 | } else { | |
1428 | sun4c_flush_segment(entry->vaddr); | |
1429 | sun4c_user_unmap(entry); | |
1430 | free_user_entry(new_ctx, entry); | |
1431 | } | |
1432 | entry = next; | |
1433 | } while ((entry != head) && (entry->vaddr < end)); | |
1434 | sun4c_set_context(octx); | |
1435 | } | |
1436 | local_irq_restore(flags); | |
1437 | } | |
1438 | } | |
1439 | ||
1440 | static void sun4c_flush_cache_page(struct vm_area_struct *vma, unsigned long page) | |
1441 | { | |
1442 | struct mm_struct *mm = vma->vm_mm; | |
1443 | int new_ctx = mm->context; | |
1444 | ||
1445 | /* Sun4c has no separate I/D caches so cannot optimize for non | |
1446 | * text page flushes. | |
1447 | */ | |
1448 | if (new_ctx != NO_CONTEXT) { | |
1449 | int octx = sun4c_get_context(); | |
1450 | unsigned long flags; | |
1451 | ||
1452 | flush_user_windows(); | |
1453 | local_irq_save(flags); | |
1454 | sun4c_set_context(new_ctx); | |
1455 | sun4c_flush_page(page); | |
1456 | sun4c_set_context(octx); | |
1457 | local_irq_restore(flags); | |
1458 | } | |
1459 | } | |
1460 | ||
1461 | static void sun4c_flush_page_to_ram(unsigned long page) | |
1462 | { | |
1463 | unsigned long flags; | |
1464 | ||
1465 | local_irq_save(flags); | |
1466 | sun4c_flush_page(page); | |
1467 | local_irq_restore(flags); | |
1468 | } | |
1469 | ||
1470 | /* Sun4c cache is unified, both instructions and data live there, so | |
1471 | * no need to flush the on-stack instructions for new signal handlers. | |
1472 | */ | |
1473 | static void sun4c_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr) | |
1474 | { | |
1475 | } | |
1476 | ||
1477 | /* TLB flushing on the sun4c. These routines count on the cache | |
1478 | * flushing code to flush the user register windows so that we need | |
1479 | * not do so when we get here. | |
1480 | */ | |
1481 | ||
1482 | static void sun4c_flush_tlb_all(void) | |
1483 | { | |
1484 | struct sun4c_mmu_entry *this_entry, *next_entry; | |
1485 | unsigned long flags; | |
1486 | int savectx, ctx; | |
1487 | ||
1488 | local_irq_save(flags); | |
1489 | this_entry = sun4c_kernel_ring.ringhd.next; | |
1490 | savectx = sun4c_get_context(); | |
1491 | flush_user_windows(); | |
1492 | while (sun4c_kernel_ring.num_entries) { | |
1493 | next_entry = this_entry->next; | |
1494 | sun4c_flush_segment(this_entry->vaddr); | |
1495 | for (ctx = 0; ctx < num_contexts; ctx++) { | |
1496 | sun4c_set_context(ctx); | |
1497 | sun4c_put_segmap(this_entry->vaddr, invalid_segment); | |
1498 | } | |
1499 | free_kernel_entry(this_entry, &sun4c_kernel_ring); | |
1500 | this_entry = next_entry; | |
1501 | } | |
1502 | sun4c_set_context(savectx); | |
1503 | local_irq_restore(flags); | |
1504 | } | |
1505 | ||
1506 | static void sun4c_flush_tlb_mm(struct mm_struct *mm) | |
1507 | { | |
1508 | int new_ctx = mm->context; | |
1509 | ||
1510 | if (new_ctx != NO_CONTEXT) { | |
1511 | struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; | |
1512 | unsigned long flags; | |
1513 | ||
1514 | local_irq_save(flags); | |
1515 | if (head->next != head) { | |
1516 | struct sun4c_mmu_entry *entry = head->next; | |
1517 | int savectx = sun4c_get_context(); | |
1518 | ||
1519 | sun4c_set_context(new_ctx); | |
1520 | sun4c_flush_context(); | |
1521 | do { | |
1522 | struct sun4c_mmu_entry *next = entry->next; | |
1523 | ||
1524 | sun4c_user_unmap(entry); | |
1525 | free_user_entry(new_ctx, entry); | |
1526 | ||
1527 | entry = next; | |
1528 | } while (entry != head); | |
1529 | sun4c_set_context(savectx); | |
1530 | } | |
1531 | local_irq_restore(flags); | |
1532 | } | |
1533 | } | |
1534 | ||
1535 | static void sun4c_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) | |
1536 | { | |
1537 | struct mm_struct *mm = vma->vm_mm; | |
1538 | int new_ctx = mm->context; | |
1539 | ||
1540 | if (new_ctx != NO_CONTEXT) { | |
1541 | struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; | |
1542 | struct sun4c_mmu_entry *entry; | |
1543 | unsigned long flags; | |
1544 | ||
1545 | local_irq_save(flags); | |
1546 | /* See commentary in sun4c_flush_cache_range(). */ | |
1547 | for (entry = head->next; | |
1548 | (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start); | |
1549 | entry = entry->next) | |
1550 | ; | |
1551 | ||
1552 | if ((entry != head) && (entry->vaddr < end)) { | |
1553 | int octx = sun4c_get_context(); | |
1554 | ||
1555 | sun4c_set_context(new_ctx); | |
1556 | do { | |
1557 | struct sun4c_mmu_entry *next = entry->next; | |
1558 | ||
1559 | sun4c_flush_segment(entry->vaddr); | |
1560 | sun4c_user_unmap(entry); | |
1561 | free_user_entry(new_ctx, entry); | |
1562 | ||
1563 | entry = next; | |
1564 | } while ((entry != head) && (entry->vaddr < end)); | |
1565 | sun4c_set_context(octx); | |
1566 | } | |
1567 | local_irq_restore(flags); | |
1568 | } | |
1569 | } | |
1570 | ||
1571 | static void sun4c_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) | |
1572 | { | |
1573 | struct mm_struct *mm = vma->vm_mm; | |
1574 | int new_ctx = mm->context; | |
1575 | ||
1576 | if (new_ctx != NO_CONTEXT) { | |
1577 | int savectx = sun4c_get_context(); | |
1578 | unsigned long flags; | |
1579 | ||
1580 | local_irq_save(flags); | |
1581 | sun4c_set_context(new_ctx); | |
1582 | page &= PAGE_MASK; | |
1583 | sun4c_flush_page(page); | |
1584 | sun4c_put_pte(page, 0); | |
1585 | sun4c_set_context(savectx); | |
1586 | local_irq_restore(flags); | |
1587 | } | |
1588 | } | |
1589 | ||
1590 | static inline void sun4c_mapioaddr(unsigned long physaddr, unsigned long virt_addr) | |
1591 | { | |
1592 | unsigned long page_entry; | |
1593 | ||
1594 | page_entry = ((physaddr >> PAGE_SHIFT) & SUN4C_PFN_MASK); | |
1595 | page_entry |= ((pg_iobits | _SUN4C_PAGE_PRIV) & ~(_SUN4C_PAGE_PRESENT)); | |
1596 | sun4c_put_pte(virt_addr, page_entry); | |
1597 | } | |
1598 | ||
1599 | static void sun4c_mapiorange(unsigned int bus, unsigned long xpa, | |
1600 | unsigned long xva, unsigned int len) | |
1601 | { | |
1602 | while (len != 0) { | |
1603 | len -= PAGE_SIZE; | |
1604 | sun4c_mapioaddr(xpa, xva); | |
1605 | xva += PAGE_SIZE; | |
1606 | xpa += PAGE_SIZE; | |
1607 | } | |
1608 | } | |
1609 | ||
1610 | static void sun4c_unmapiorange(unsigned long virt_addr, unsigned int len) | |
1611 | { | |
1612 | while (len != 0) { | |
1613 | len -= PAGE_SIZE; | |
1614 | sun4c_put_pte(virt_addr, 0); | |
1615 | virt_addr += PAGE_SIZE; | |
1616 | } | |
1617 | } | |
1618 | ||
1619 | static void sun4c_alloc_context(struct mm_struct *old_mm, struct mm_struct *mm) | |
1620 | { | |
1621 | struct ctx_list *ctxp; | |
1622 | ||
1623 | ctxp = ctx_free.next; | |
1624 | if (ctxp != &ctx_free) { | |
1625 | remove_from_ctx_list(ctxp); | |
1626 | add_to_used_ctxlist(ctxp); | |
1627 | mm->context = ctxp->ctx_number; | |
1628 | ctxp->ctx_mm = mm; | |
1629 | return; | |
1630 | } | |
1631 | ctxp = ctx_used.next; | |
1632 | if (ctxp->ctx_mm == old_mm) | |
1633 | ctxp = ctxp->next; | |
1634 | remove_from_ctx_list(ctxp); | |
1635 | add_to_used_ctxlist(ctxp); | |
1636 | ctxp->ctx_mm->context = NO_CONTEXT; | |
1637 | ctxp->ctx_mm = mm; | |
1638 | mm->context = ctxp->ctx_number; | |
1639 | sun4c_demap_context(&sun4c_context_ring[ctxp->ctx_number], | |
1640 | ctxp->ctx_number); | |
1641 | } | |
1642 | ||
1643 | /* Switch the current MM context. */ | |
1644 | static void sun4c_switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk, int cpu) | |
1645 | { | |
1646 | struct ctx_list *ctx; | |
1647 | int dirty = 0; | |
1648 | ||
1649 | if (mm->context == NO_CONTEXT) { | |
1650 | dirty = 1; | |
1651 | sun4c_alloc_context(old_mm, mm); | |
1652 | } else { | |
1653 | /* Update the LRU ring of contexts. */ | |
1654 | ctx = ctx_list_pool + mm->context; | |
1655 | remove_from_ctx_list(ctx); | |
1656 | add_to_used_ctxlist(ctx); | |
1657 | } | |
1658 | if (dirty || old_mm != mm) | |
1659 | sun4c_set_context(mm->context); | |
1660 | } | |
1661 | ||
1662 | static void sun4c_destroy_context(struct mm_struct *mm) | |
1663 | { | |
1664 | struct ctx_list *ctx_old; | |
1665 | ||
1666 | if (mm->context != NO_CONTEXT) { | |
1667 | sun4c_demap_context(&sun4c_context_ring[mm->context], mm->context); | |
1668 | ctx_old = ctx_list_pool + mm->context; | |
1669 | remove_from_ctx_list(ctx_old); | |
1670 | add_to_free_ctxlist(ctx_old); | |
1671 | mm->context = NO_CONTEXT; | |
1672 | } | |
1673 | } | |
1674 | ||
1675 | static void sun4c_mmu_info(struct seq_file *m) | |
1676 | { | |
1677 | int used_user_entries, i; | |
1678 | ||
1679 | used_user_entries = 0; | |
1680 | for (i = 0; i < num_contexts; i++) | |
1681 | used_user_entries += sun4c_context_ring[i].num_entries; | |
1682 | ||
1683 | seq_printf(m, | |
1684 | "vacsize\t\t: %d bytes\n" | |
1685 | "vachwflush\t: %s\n" | |
1686 | "vaclinesize\t: %d bytes\n" | |
1687 | "mmuctxs\t\t: %d\n" | |
1688 | "mmupsegs\t: %d\n" | |
1689 | "kernelpsegs\t: %d\n" | |
1690 | "kfreepsegs\t: %d\n" | |
1691 | "usedpsegs\t: %d\n" | |
1692 | "ufreepsegs\t: %d\n" | |
1693 | "user_taken\t: %d\n" | |
1694 | "max_taken\t: %d\n", | |
1695 | sun4c_vacinfo.num_bytes, | |
1696 | (sun4c_vacinfo.do_hwflushes ? "yes" : "no"), | |
1697 | sun4c_vacinfo.linesize, | |
1698 | num_contexts, | |
1699 | (invalid_segment + 1), | |
1700 | sun4c_kernel_ring.num_entries, | |
1701 | sun4c_kfree_ring.num_entries, | |
1702 | used_user_entries, | |
1703 | sun4c_ufree_ring.num_entries, | |
1704 | sun4c_user_taken_entries, | |
1705 | max_user_taken_entries); | |
1706 | } | |
1707 | ||
1708 | /* Nothing below here should touch the mmu hardware nor the mmu_entry | |
1709 | * data structures. | |
1710 | */ | |
1711 | ||
1712 | /* First the functions which the mid-level code uses to directly | |
1713 | * manipulate the software page tables. Some defines since we are | |
1714 | * emulating the i386 page directory layout. | |
1715 | */ | |
1716 | #define PGD_PRESENT 0x001 | |
1717 | #define PGD_RW 0x002 | |
1718 | #define PGD_USER 0x004 | |
1719 | #define PGD_ACCESSED 0x020 | |
1720 | #define PGD_DIRTY 0x040 | |
1721 | #define PGD_TABLE (PGD_PRESENT | PGD_RW | PGD_USER | PGD_ACCESSED | PGD_DIRTY) | |
1722 | ||
1723 | static void sun4c_set_pte(pte_t *ptep, pte_t pte) | |
1724 | { | |
1725 | *ptep = pte; | |
1726 | } | |
1727 | ||
1728 | static void sun4c_pgd_set(pgd_t * pgdp, pmd_t * pmdp) | |
1729 | { | |
1730 | } | |
1731 | ||
1732 | static void sun4c_pmd_set(pmd_t * pmdp, pte_t * ptep) | |
1733 | { | |
1734 | pmdp->pmdv[0] = PGD_TABLE | (unsigned long) ptep; | |
1735 | } | |
1736 | ||
1737 | static void sun4c_pmd_populate(pmd_t * pmdp, struct page * ptep) | |
1738 | { | |
1739 | if (page_address(ptep) == NULL) BUG(); /* No highmem on sun4c */ | |
1740 | pmdp->pmdv[0] = PGD_TABLE | (unsigned long) page_address(ptep); | |
1741 | } | |
1742 | ||
1743 | static int sun4c_pte_present(pte_t pte) | |
1744 | { | |
1745 | return ((pte_val(pte) & (_SUN4C_PAGE_PRESENT | _SUN4C_PAGE_PRIV)) != 0); | |
1746 | } | |
1747 | static void sun4c_pte_clear(pte_t *ptep) { *ptep = __pte(0); } | |
1748 | ||
1749 | static int sun4c_pte_read(pte_t pte) | |
1750 | { | |
1751 | return (pte_val(pte) & _SUN4C_PAGE_READ); | |
1752 | } | |
1753 | ||
1754 | static int sun4c_pmd_bad(pmd_t pmd) | |
1755 | { | |
1756 | return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) || | |
1757 | (!virt_addr_valid(pmd_val(pmd)))); | |
1758 | } | |
1759 | ||
1760 | static int sun4c_pmd_present(pmd_t pmd) | |
1761 | { | |
1762 | return ((pmd_val(pmd) & PGD_PRESENT) != 0); | |
1763 | } | |
1764 | ||
1765 | #if 0 /* if PMD takes one word */ | |
1766 | static void sun4c_pmd_clear(pmd_t *pmdp) { *pmdp = __pmd(0); } | |
1767 | #else /* if pmd_t is a longish aggregate */ | |
1768 | static void sun4c_pmd_clear(pmd_t *pmdp) { | |
1769 | memset((void *)pmdp, 0, sizeof(pmd_t)); | |
1770 | } | |
1771 | #endif | |
1772 | ||
1773 | static int sun4c_pgd_none(pgd_t pgd) { return 0; } | |
1774 | static int sun4c_pgd_bad(pgd_t pgd) { return 0; } | |
1775 | static int sun4c_pgd_present(pgd_t pgd) { return 1; } | |
1776 | static void sun4c_pgd_clear(pgd_t * pgdp) { } | |
1777 | ||
1778 | /* | |
1779 | * The following only work if pte_present() is true. | |
1780 | * Undefined behaviour if not.. | |
1781 | */ | |
1782 | static pte_t sun4c_pte_mkwrite(pte_t pte) | |
1783 | { | |
1784 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE); | |
1785 | if (pte_val(pte) & _SUN4C_PAGE_MODIFIED) | |
1786 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE); | |
1787 | return pte; | |
1788 | } | |
1789 | ||
1790 | static pte_t sun4c_pte_mkdirty(pte_t pte) | |
1791 | { | |
1792 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED); | |
1793 | if (pte_val(pte) & _SUN4C_PAGE_WRITE) | |
1794 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE); | |
1795 | return pte; | |
1796 | } | |
1797 | ||
1798 | static pte_t sun4c_pte_mkyoung(pte_t pte) | |
1799 | { | |
1800 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED); | |
1801 | if (pte_val(pte) & _SUN4C_PAGE_READ) | |
1802 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ); | |
1803 | return pte; | |
1804 | } | |
1805 | ||
1806 | /* | |
1807 | * Conversion functions: convert a page and protection to a page entry, | |
1808 | * and a page entry and page directory to the page they refer to. | |
1809 | */ | |
1810 | static pte_t sun4c_mk_pte(struct page *page, pgprot_t pgprot) | |
1811 | { | |
1812 | return __pte(page_to_pfn(page) | pgprot_val(pgprot)); | |
1813 | } | |
1814 | ||
1815 | static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot) | |
1816 | { | |
1817 | return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot)); | |
1818 | } | |
1819 | ||
1820 | static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space) | |
1821 | { | |
1822 | return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot)); | |
1823 | } | |
1824 | ||
1825 | static unsigned long sun4c_pte_pfn(pte_t pte) | |
1826 | { | |
1827 | return pte_val(pte) & SUN4C_PFN_MASK; | |
1828 | } | |
1829 | ||
1830 | static pte_t sun4c_pgoff_to_pte(unsigned long pgoff) | |
1831 | { | |
1832 | return __pte(pgoff | _SUN4C_PAGE_FILE); | |
1833 | } | |
1834 | ||
1835 | static unsigned long sun4c_pte_to_pgoff(pte_t pte) | |
1836 | { | |
1837 | return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1); | |
1838 | } | |
1839 | ||
1840 | ||
1841 | static __inline__ unsigned long sun4c_pmd_page_v(pmd_t pmd) | |
1842 | { | |
1843 | return (pmd_val(pmd) & PAGE_MASK); | |
1844 | } | |
1845 | ||
1846 | static struct page *sun4c_pmd_page(pmd_t pmd) | |
1847 | { | |
1848 | return virt_to_page(sun4c_pmd_page_v(pmd)); | |
1849 | } | |
1850 | ||
1851 | static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; } | |
1852 | ||
1853 | /* to find an entry in a page-table-directory */ | |
1854 | static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address) | |
1855 | { | |
1856 | return mm->pgd + (address >> SUN4C_PGDIR_SHIFT); | |
1857 | } | |
1858 | ||
1859 | /* Find an entry in the second-level page table.. */ | |
1860 | static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address) | |
1861 | { | |
1862 | return (pmd_t *) dir; | |
1863 | } | |
1864 | ||
1865 | /* Find an entry in the third-level page table.. */ | |
1866 | pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address) | |
1867 | { | |
1868 | return (pte_t *) sun4c_pmd_page_v(*dir) + | |
1869 | ((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1)); | |
1870 | } | |
1871 | ||
1872 | static unsigned long sun4c_swp_type(swp_entry_t entry) | |
1873 | { | |
1874 | return (entry.val & SUN4C_SWP_TYPE_MASK); | |
1875 | } | |
1876 | ||
1877 | static unsigned long sun4c_swp_offset(swp_entry_t entry) | |
1878 | { | |
1879 | return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK; | |
1880 | } | |
1881 | ||
1882 | static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset) | |
1883 | { | |
1884 | return (swp_entry_t) { | |
1885 | (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT | |
1886 | | (type & SUN4C_SWP_TYPE_MASK) }; | |
1887 | } | |
1888 | ||
1889 | static void sun4c_free_pte_slow(pte_t *pte) | |
1890 | { | |
1891 | free_page((unsigned long)pte); | |
1892 | } | |
1893 | ||
1894 | static void sun4c_free_pgd_slow(pgd_t *pgd) | |
1895 | { | |
1896 | free_page((unsigned long)pgd); | |
1897 | } | |
1898 | ||
1899 | static pgd_t *sun4c_get_pgd_fast(void) | |
1900 | { | |
1901 | unsigned long *ret; | |
1902 | ||
1903 | if ((ret = pgd_quicklist) != NULL) { | |
1904 | pgd_quicklist = (unsigned long *)(*ret); | |
1905 | ret[0] = ret[1]; | |
1906 | pgtable_cache_size--; | |
1907 | } else { | |
1908 | pgd_t *init; | |
1909 | ||
1910 | ret = (unsigned long *)__get_free_page(GFP_KERNEL); | |
1911 | memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t)); | |
1912 | init = sun4c_pgd_offset(&init_mm, 0); | |
1913 | memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, | |
1914 | (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); | |
1915 | } | |
1916 | return (pgd_t *)ret; | |
1917 | } | |
1918 | ||
1919 | static void sun4c_free_pgd_fast(pgd_t *pgd) | |
1920 | { | |
1921 | *(unsigned long *)pgd = (unsigned long) pgd_quicklist; | |
1922 | pgd_quicklist = (unsigned long *) pgd; | |
1923 | pgtable_cache_size++; | |
1924 | } | |
1925 | ||
1926 | ||
1927 | static __inline__ pte_t * | |
1928 | sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address) | |
1929 | { | |
1930 | unsigned long *ret; | |
1931 | ||
1932 | if ((ret = (unsigned long *)pte_quicklist) != NULL) { | |
1933 | pte_quicklist = (unsigned long *)(*ret); | |
1934 | ret[0] = ret[1]; | |
1935 | pgtable_cache_size--; | |
1936 | } | |
1937 | return (pte_t *)ret; | |
1938 | } | |
1939 | ||
1940 | static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) | |
1941 | { | |
1942 | pte_t *pte; | |
1943 | ||
1944 | if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL) | |
1945 | return pte; | |
1946 | ||
1947 | pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT); | |
1948 | if (pte) | |
1949 | memset(pte, 0, PAGE_SIZE); | |
1950 | return pte; | |
1951 | } | |
1952 | ||
1953 | static struct page *sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address) | |
1954 | { | |
1955 | pte_t *pte = sun4c_pte_alloc_one_kernel(mm, address); | |
1956 | if (pte == NULL) | |
1957 | return NULL; | |
1958 | return virt_to_page(pte); | |
1959 | } | |
1960 | ||
1961 | static __inline__ void sun4c_free_pte_fast(pte_t *pte) | |
1962 | { | |
1963 | *(unsigned long *)pte = (unsigned long) pte_quicklist; | |
1964 | pte_quicklist = (unsigned long *) pte; | |
1965 | pgtable_cache_size++; | |
1966 | } | |
1967 | ||
1968 | static void sun4c_pte_free(struct page *pte) | |
1969 | { | |
1970 | sun4c_free_pte_fast(page_address(pte)); | |
1971 | } | |
1972 | ||
1973 | /* | |
1974 | * allocating and freeing a pmd is trivial: the 1-entry pmd is | |
1975 | * inside the pgd, so has no extra memory associated with it. | |
1976 | */ | |
1977 | static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address) | |
1978 | { | |
1979 | BUG(); | |
1980 | return NULL; | |
1981 | } | |
1982 | ||
1983 | static void sun4c_free_pmd_fast(pmd_t * pmd) { } | |
1984 | ||
1985 | static void sun4c_check_pgt_cache(int low, int high) | |
1986 | { | |
1987 | if (pgtable_cache_size > high) { | |
1988 | do { | |
1989 | if (pgd_quicklist) | |
1990 | sun4c_free_pgd_slow(sun4c_get_pgd_fast()); | |
1991 | if (pte_quicklist) | |
1992 | sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0)); | |
1993 | } while (pgtable_cache_size > low); | |
1994 | } | |
1995 | } | |
1996 | ||
1997 | /* An experiment, turn off by default for now... -DaveM */ | |
1998 | #define SUN4C_PRELOAD_PSEG | |
1999 | ||
2000 | void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte) | |
2001 | { | |
2002 | unsigned long flags; | |
2003 | int pseg; | |
2004 | ||
2005 | local_irq_save(flags); | |
2006 | address &= PAGE_MASK; | |
2007 | if ((pseg = sun4c_get_segmap(address)) == invalid_segment) { | |
2008 | struct sun4c_mmu_entry *entry = sun4c_user_strategy(); | |
2009 | struct mm_struct *mm = vma->vm_mm; | |
2010 | unsigned long start, end; | |
2011 | ||
2012 | entry->vaddr = start = (address & SUN4C_REAL_PGDIR_MASK); | |
2013 | entry->ctx = mm->context; | |
2014 | add_ring_ordered(sun4c_context_ring + mm->context, entry); | |
2015 | sun4c_put_segmap(entry->vaddr, entry->pseg); | |
2016 | end = start + SUN4C_REAL_PGDIR_SIZE; | |
2017 | while (start < end) { | |
2018 | #ifdef SUN4C_PRELOAD_PSEG | |
2019 | pgd_t *pgdp = sun4c_pgd_offset(mm, start); | |
2020 | pte_t *ptep; | |
2021 | ||
2022 | if (!pgdp) | |
2023 | goto no_mapping; | |
2024 | ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, start); | |
2025 | if (!ptep || !(pte_val(*ptep) & _SUN4C_PAGE_PRESENT)) | |
2026 | goto no_mapping; | |
2027 | sun4c_put_pte(start, pte_val(*ptep)); | |
2028 | goto next; | |
2029 | ||
2030 | no_mapping: | |
2031 | #endif | |
2032 | sun4c_put_pte(start, 0); | |
2033 | #ifdef SUN4C_PRELOAD_PSEG | |
2034 | next: | |
2035 | #endif | |
2036 | start += PAGE_SIZE; | |
2037 | } | |
2038 | #ifndef SUN4C_PRELOAD_PSEG | |
2039 | sun4c_put_pte(address, pte_val(pte)); | |
2040 | #endif | |
2041 | local_irq_restore(flags); | |
2042 | return; | |
2043 | } else { | |
2044 | struct sun4c_mmu_entry *entry = &mmu_entry_pool[pseg]; | |
2045 | ||
2046 | remove_lru(entry); | |
2047 | add_lru(entry); | |
2048 | } | |
2049 | ||
2050 | sun4c_put_pte(address, pte_val(pte)); | |
2051 | local_irq_restore(flags); | |
2052 | } | |
2053 | ||
2054 | extern void sparc_context_init(int); | |
2055 | extern unsigned long end; | |
2056 | extern unsigned long bootmem_init(unsigned long *pages_avail); | |
2057 | extern unsigned long last_valid_pfn; | |
2058 | ||
2059 | void __init sun4c_paging_init(void) | |
2060 | { | |
2061 | int i, cnt; | |
2062 | unsigned long kernel_end, vaddr; | |
2063 | extern struct resource sparc_iomap; | |
2064 | unsigned long end_pfn, pages_avail; | |
2065 | ||
2066 | kernel_end = (unsigned long) &end; | |
2067 | kernel_end += (SUN4C_REAL_PGDIR_SIZE * 4); | |
2068 | kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end); | |
2069 | ||
2070 | pages_avail = 0; | |
2071 | last_valid_pfn = bootmem_init(&pages_avail); | |
2072 | end_pfn = last_valid_pfn; | |
2073 | ||
2074 | sun4c_probe_mmu(); | |
2075 | invalid_segment = (num_segmaps - 1); | |
2076 | sun4c_init_mmu_entry_pool(); | |
2077 | sun4c_init_rings(); | |
2078 | sun4c_init_map_kernelprom(kernel_end); | |
2079 | sun4c_init_clean_mmu(kernel_end); | |
2080 | sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS); | |
2081 | sun4c_init_lock_area(sparc_iomap.start, IOBASE_END); | |
2082 | sun4c_init_lock_area(DVMA_VADDR, DVMA_END); | |
2083 | sun4c_init_lock_areas(); | |
2084 | sun4c_init_fill_user_ring(); | |
2085 | ||
2086 | sun4c_set_context(0); | |
2087 | memset(swapper_pg_dir, 0, PAGE_SIZE); | |
2088 | memset(pg0, 0, PAGE_SIZE); | |
2089 | memset(pg1, 0, PAGE_SIZE); | |
2090 | memset(pg2, 0, PAGE_SIZE); | |
2091 | memset(pg3, 0, PAGE_SIZE); | |
2092 | ||
2093 | /* Save work later. */ | |
2094 | vaddr = VMALLOC_START; | |
2095 | swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0); | |
2096 | vaddr += SUN4C_PGDIR_SIZE; | |
2097 | swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1); | |
2098 | vaddr += SUN4C_PGDIR_SIZE; | |
2099 | swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2); | |
2100 | vaddr += SUN4C_PGDIR_SIZE; | |
2101 | swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3); | |
2102 | sun4c_init_ss2_cache_bug(); | |
2103 | sparc_context_init(num_contexts); | |
2104 | ||
2105 | { | |
2106 | unsigned long zones_size[MAX_NR_ZONES]; | |
2107 | unsigned long zholes_size[MAX_NR_ZONES]; | |
2108 | unsigned long npages; | |
2109 | int znum; | |
2110 | ||
2111 | for (znum = 0; znum < MAX_NR_ZONES; znum++) | |
2112 | zones_size[znum] = zholes_size[znum] = 0; | |
2113 | ||
2114 | npages = max_low_pfn - pfn_base; | |
2115 | ||
2116 | zones_size[ZONE_DMA] = npages; | |
2117 | zholes_size[ZONE_DMA] = npages - pages_avail; | |
2118 | ||
2119 | npages = highend_pfn - max_low_pfn; | |
2120 | zones_size[ZONE_HIGHMEM] = npages; | |
2121 | zholes_size[ZONE_HIGHMEM] = npages - calc_highpages(); | |
2122 | ||
2123 | free_area_init_node(0, &contig_page_data, zones_size, | |
2124 | pfn_base, zholes_size); | |
2125 | } | |
2126 | ||
2127 | cnt = 0; | |
2128 | for (i = 0; i < num_segmaps; i++) | |
2129 | if (mmu_entry_pool[i].locked) | |
2130 | cnt++; | |
2131 | ||
2132 | max_user_taken_entries = num_segmaps - cnt - 40 - 1; | |
2133 | ||
2134 | printk("SUN4C: %d mmu entries for the kernel\n", cnt); | |
2135 | } | |
2136 | ||
2137 | /* Load up routines and constants for sun4c mmu */ | |
2138 | void __init ld_mmu_sun4c(void) | |
2139 | { | |
2140 | extern void ___xchg32_sun4c(void); | |
2141 | ||
2142 | printk("Loading sun4c MMU routines\n"); | |
2143 | ||
2144 | /* First the constants */ | |
2145 | BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT); | |
2146 | BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE); | |
2147 | BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK); | |
2148 | ||
2149 | BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD); | |
2150 | BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD); | |
2151 | BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE); | |
2152 | ||
2153 | BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE)); | |
2154 | BTFIXUPSET_INT(page_shared, pgprot_val(SUN4C_PAGE_SHARED)); | |
2155 | BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY)); | |
2156 | BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY)); | |
2157 | BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL)); | |
2158 | page_kernel = pgprot_val(SUN4C_PAGE_KERNEL); | |
2159 | pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE | | |
2160 | _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE; | |
2161 | ||
2162 | /* Functions */ | |
2163 | BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM); | |
2164 | BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM); | |
2165 | ||
2166 | BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM); | |
2167 | ||
2168 | if (sun4c_vacinfo.do_hwflushes) { | |
2169 | BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM); | |
2170 | BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM); | |
2171 | BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM); | |
2172 | } else { | |
2173 | BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM); | |
2174 | BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM); | |
2175 | BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM); | |
2176 | } | |
2177 | ||
2178 | BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM); | |
2179 | BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM); | |
2180 | BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM); | |
2181 | BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM); | |
2182 | BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM); | |
2183 | BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM); | |
2184 | BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM); | |
2185 | BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM); | |
2186 | BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM); | |
2187 | BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM); | |
2188 | ||
2189 | BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP); | |
2190 | ||
2191 | BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0); | |
2192 | ||
2193 | /* The 2.4.18 code does not set this on sun4c, how does it work? XXX */ | |
2194 | /* BTFIXUPSET_SETHI(none_mask, 0x00000000); */ /* Defaults to zero? */ | |
2195 | ||
2196 | BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM); | |
2197 | #if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */ | |
2198 | BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1)); | |
2199 | #else | |
2200 | BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM); | |
2201 | #endif | |
2202 | BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM); | |
2203 | BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM); | |
2204 | ||
2205 | BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM); | |
2206 | BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0); | |
2207 | BTFIXUPSET_CALL(pte_read, sun4c_pte_read, BTFIXUPCALL_NORM); | |
2208 | ||
2209 | BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM); | |
2210 | BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM); | |
2211 | BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0); | |
2212 | ||
2213 | BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0)); | |
2214 | BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0)); | |
2215 | BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1)); | |
2216 | BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP); | |
2217 | ||
2218 | BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM); | |
2219 | BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM); | |
2220 | BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM); | |
2221 | ||
2222 | BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK); | |
2223 | BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM); | |
2224 | BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM); | |
2225 | BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM); | |
2226 | BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM); | |
2227 | BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM); | |
2228 | BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM); | |
2229 | BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP); | |
2230 | BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0); | |
2231 | BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM); | |
2232 | BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM); | |
2233 | ||
2234 | BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE); | |
2235 | BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED); | |
2236 | BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED); | |
2237 | BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE); | |
2238 | BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE); | |
2239 | BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE); | |
2240 | BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ); | |
2241 | BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM); | |
2242 | BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM); | |
2243 | BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM); | |
2244 | BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM); | |
2245 | ||
2246 | BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM); | |
2247 | BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM); | |
2248 | ||
2249 | BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM); | |
2250 | BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM); | |
2251 | ||
2252 | BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM); | |
2253 | BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM); | |
2254 | BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM); | |
2255 | BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM); | |
2256 | ||
2257 | BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM); | |
2258 | BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM); | |
2259 | BTFIXUPSET_CALL(mmu_translate_dvma, sun4c_translate_dvma, BTFIXUPCALL_NORM); | |
2260 | ||
2261 | BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM); | |
2262 | BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM); | |
2263 | ||
2264 | BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM); | |
2265 | BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM); | |
2266 | BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM); | |
2267 | ||
2268 | BTFIXUPSET_CALL(alloc_thread_info, sun4c_alloc_thread_info, BTFIXUPCALL_NORM); | |
2269 | BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM); | |
2270 | ||
2271 | BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM); | |
2272 | ||
2273 | /* These should _never_ get called with two level tables. */ | |
2274 | BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP); | |
2275 | BTFIXUPSET_CALL(pgd_page, sun4c_pgd_page, BTFIXUPCALL_RETO0); | |
2276 | } |