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 | * Copyright (C) 1994 - 2000 Ralf Baechle | |
7 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. | |
8 | * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com | |
9 | * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved. | |
10 | */ | |
b868868a | 11 | #include <linux/bug.h> |
1da177e4 LT |
12 | #include <linux/init.h> |
13 | #include <linux/module.h> | |
14 | #include <linux/signal.h> | |
15 | #include <linux/sched.h> | |
631330f5 | 16 | #include <linux/smp.h> |
1da177e4 LT |
17 | #include <linux/kernel.h> |
18 | #include <linux/errno.h> | |
19 | #include <linux/string.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/pagemap.h> | |
22 | #include <linux/ptrace.h> | |
23 | #include <linux/mman.h> | |
24 | #include <linux/mm.h> | |
25 | #include <linux/bootmem.h> | |
26 | #include <linux/highmem.h> | |
27 | #include <linux/swap.h> | |
3d503753 | 28 | #include <linux/proc_fs.h> |
22a9835c | 29 | #include <linux/pfn.h> |
0f334a3e | 30 | #include <linux/hardirq.h> |
5a0e3ad6 | 31 | #include <linux/gfp.h> |
2f96b8c1 | 32 | #include <linux/kcore.h> |
1da177e4 | 33 | |
9975e77d | 34 | #include <asm/asm-offsets.h> |
1da177e4 LT |
35 | #include <asm/bootinfo.h> |
36 | #include <asm/cachectl.h> | |
37 | #include <asm/cpu.h> | |
38 | #include <asm/dma.h> | |
f8829cae | 39 | #include <asm/kmap_types.h> |
1da177e4 LT |
40 | #include <asm/mmu_context.h> |
41 | #include <asm/sections.h> | |
42 | #include <asm/pgtable.h> | |
43 | #include <asm/pgalloc.h> | |
44 | #include <asm/tlb.h> | |
f8829cae RB |
45 | #include <asm/fixmap.h> |
46 | ||
1da177e4 LT |
47 | /* |
48 | * We have up to 8 empty zeroed pages so we can map one of the right colour | |
70342287 | 49 | * when needed. This is necessary only on R4000 / R4400 SC and MC versions |
1da177e4 LT |
50 | * where we have to avoid VCED / VECI exceptions for good performance at |
51 | * any price. Since page is never written to after the initialization we | |
52 | * don't have to care about aliases on other CPUs. | |
53 | */ | |
54 | unsigned long empty_zero_page, zero_page_mask; | |
497d2adc | 55 | EXPORT_SYMBOL_GPL(empty_zero_page); |
1da177e4 LT |
56 | |
57 | /* | |
58 | * Not static inline because used by IP27 special magic initialization code | |
59 | */ | |
31605922 | 60 | void setup_zero_pages(void) |
1da177e4 | 61 | { |
31605922 | 62 | unsigned int order, i; |
1da177e4 LT |
63 | struct page *page; |
64 | ||
65 | if (cpu_has_vce) | |
66 | order = 3; | |
67 | else | |
68 | order = 0; | |
69 | ||
70 | empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); | |
71 | if (!empty_zero_page) | |
72 | panic("Oh boy, that early out of memory?"); | |
73 | ||
99e3b942 | 74 | page = virt_to_page((void *)empty_zero_page); |
8dfcc9ba | 75 | split_page(page, order); |
31605922 JL |
76 | for (i = 0; i < (1 << order); i++, page++) |
77 | mark_page_reserved(page); | |
1da177e4 | 78 | |
31605922 | 79 | zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK; |
1da177e4 LT |
80 | } |
81 | ||
e2a9e5ad | 82 | static void *__kmap_pgprot(struct page *page, unsigned long addr, pgprot_t prot) |
f8829cae RB |
83 | { |
84 | enum fixed_addresses idx; | |
85 | unsigned long vaddr, flags, entrylo; | |
86 | unsigned long old_ctx; | |
87 | pte_t pte; | |
88 | int tlbidx; | |
89 | ||
b868868a RB |
90 | BUG_ON(Page_dcache_dirty(page)); |
91 | ||
bdb43806 | 92 | pagefault_disable(); |
f8829cae | 93 | idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1); |
0f334a3e | 94 | idx += in_interrupt() ? FIX_N_COLOURS : 0; |
f8829cae | 95 | vaddr = __fix_to_virt(FIX_CMAP_END - idx); |
e2a9e5ad | 96 | pte = mk_pte(page, prot); |
962f480e | 97 | #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) |
f8829cae RB |
98 | entrylo = pte.pte_high; |
99 | #else | |
6dd9344c | 100 | entrylo = pte_to_entrylo(pte_val(pte)); |
f8829cae RB |
101 | #endif |
102 | ||
b633648c | 103 | local_irq_save(flags); |
f8829cae RB |
104 | old_ctx = read_c0_entryhi(); |
105 | write_c0_entryhi(vaddr & (PAGE_MASK << 1)); | |
106 | write_c0_entrylo0(entrylo); | |
107 | write_c0_entrylo1(entrylo); | |
f8829cae RB |
108 | tlbidx = read_c0_wired(); |
109 | write_c0_wired(tlbidx + 1); | |
110 | write_c0_index(tlbidx); | |
111 | mtc0_tlbw_hazard(); | |
112 | tlb_write_indexed(); | |
f8829cae RB |
113 | tlbw_use_hazard(); |
114 | write_c0_entryhi(old_ctx); | |
b633648c | 115 | local_irq_restore(flags); |
f8829cae RB |
116 | |
117 | return (void*) vaddr; | |
118 | } | |
119 | ||
e2a9e5ad PB |
120 | void *kmap_coherent(struct page *page, unsigned long addr) |
121 | { | |
122 | return __kmap_pgprot(page, addr, PAGE_KERNEL); | |
123 | } | |
124 | ||
125 | void *kmap_noncoherent(struct page *page, unsigned long addr) | |
126 | { | |
127 | return __kmap_pgprot(page, addr, PAGE_KERNEL_NC); | |
128 | } | |
129 | ||
eacb9d61 | 130 | void kunmap_coherent(void) |
f8829cae | 131 | { |
f8829cae RB |
132 | unsigned int wired; |
133 | unsigned long flags, old_ctx; | |
134 | ||
b633648c | 135 | local_irq_save(flags); |
f8829cae RB |
136 | old_ctx = read_c0_entryhi(); |
137 | wired = read_c0_wired() - 1; | |
138 | write_c0_wired(wired); | |
139 | write_c0_index(wired); | |
140 | write_c0_entryhi(UNIQUE_ENTRYHI(wired)); | |
141 | write_c0_entrylo0(0); | |
142 | write_c0_entrylo1(0); | |
143 | mtc0_tlbw_hazard(); | |
144 | tlb_write_indexed(); | |
145 | tlbw_use_hazard(); | |
146 | write_c0_entryhi(old_ctx); | |
b633648c | 147 | local_irq_restore(flags); |
bdb43806 | 148 | pagefault_enable(); |
f8829cae RB |
149 | } |
150 | ||
bcd02280 AN |
151 | void copy_user_highpage(struct page *to, struct page *from, |
152 | unsigned long vaddr, struct vm_area_struct *vma) | |
153 | { | |
154 | void *vfrom, *vto; | |
155 | ||
9c02048f | 156 | vto = kmap_atomic(to); |
9a74b3eb RB |
157 | if (cpu_has_dc_aliases && |
158 | page_mapped(from) && !Page_dcache_dirty(from)) { | |
bcd02280 AN |
159 | vfrom = kmap_coherent(from, vaddr); |
160 | copy_page(vto, vfrom); | |
eacb9d61 | 161 | kunmap_coherent(); |
bcd02280 | 162 | } else { |
9c02048f | 163 | vfrom = kmap_atomic(from); |
bcd02280 | 164 | copy_page(vto, vfrom); |
9c02048f | 165 | kunmap_atomic(vfrom); |
bcd02280 | 166 | } |
39b8d525 | 167 | if ((!cpu_has_ic_fills_f_dc) || |
bcd02280 AN |
168 | pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK)) |
169 | flush_data_cache_page((unsigned long)vto); | |
9c02048f | 170 | kunmap_atomic(vto); |
bcd02280 AN |
171 | /* Make sure this page is cleared on other CPU's too before using it */ |
172 | smp_wmb(); | |
173 | } | |
174 | ||
f8829cae RB |
175 | void copy_to_user_page(struct vm_area_struct *vma, |
176 | struct page *page, unsigned long vaddr, void *dst, const void *src, | |
177 | unsigned long len) | |
178 | { | |
9a74b3eb RB |
179 | if (cpu_has_dc_aliases && |
180 | page_mapped(page) && !Page_dcache_dirty(page)) { | |
f8829cae RB |
181 | void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); |
182 | memcpy(vto, src, len); | |
eacb9d61 | 183 | kunmap_coherent(); |
985c30ef | 184 | } else { |
f8829cae | 185 | memcpy(dst, src, len); |
985c30ef RB |
186 | if (cpu_has_dc_aliases) |
187 | SetPageDcacheDirty(page); | |
188 | } | |
f8829cae RB |
189 | if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc) |
190 | flush_cache_page(vma, vaddr, page_to_pfn(page)); | |
191 | } | |
192 | ||
f8829cae RB |
193 | void copy_from_user_page(struct vm_area_struct *vma, |
194 | struct page *page, unsigned long vaddr, void *dst, const void *src, | |
195 | unsigned long len) | |
196 | { | |
9a74b3eb RB |
197 | if (cpu_has_dc_aliases && |
198 | page_mapped(page) && !Page_dcache_dirty(page)) { | |
985c30ef | 199 | void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); |
f8829cae | 200 | memcpy(dst, vfrom, len); |
eacb9d61 | 201 | kunmap_coherent(); |
985c30ef | 202 | } else { |
f8829cae | 203 | memcpy(dst, src, len); |
985c30ef RB |
204 | if (cpu_has_dc_aliases) |
205 | SetPageDcacheDirty(page); | |
206 | } | |
f8829cae | 207 | } |
bf9621aa | 208 | EXPORT_SYMBOL_GPL(copy_from_user_page); |
f8829cae | 209 | |
84fd089a | 210 | void __init fixrange_init(unsigned long start, unsigned long end, |
1da177e4 LT |
211 | pgd_t *pgd_base) |
212 | { | |
b633648c | 213 | #ifdef CONFIG_HIGHMEM |
1da177e4 | 214 | pgd_t *pgd; |
c6e8b587 | 215 | pud_t *pud; |
1da177e4 LT |
216 | pmd_t *pmd; |
217 | pte_t *pte; | |
c6e8b587 | 218 | int i, j, k; |
1da177e4 LT |
219 | unsigned long vaddr; |
220 | ||
221 | vaddr = start; | |
222 | i = __pgd_offset(vaddr); | |
c6e8b587 RB |
223 | j = __pud_offset(vaddr); |
224 | k = __pmd_offset(vaddr); | |
1da177e4 LT |
225 | pgd = pgd_base + i; |
226 | ||
464fd83e | 227 | for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) { |
c6e8b587 | 228 | pud = (pud_t *)pgd; |
464fd83e | 229 | for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) { |
c6e8b587 | 230 | pmd = (pmd_t *)pud; |
464fd83e | 231 | for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) { |
c6e8b587 RB |
232 | if (pmd_none(*pmd)) { |
233 | pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
f8829cae | 234 | set_pmd(pmd, __pmd((unsigned long)pte)); |
b72b7092 | 235 | BUG_ON(pte != pte_offset_kernel(pmd, 0)); |
c6e8b587 RB |
236 | } |
237 | vaddr += PMD_SIZE; | |
1da177e4 | 238 | } |
c6e8b587 | 239 | k = 0; |
1da177e4 LT |
240 | } |
241 | j = 0; | |
242 | } | |
f8829cae | 243 | #endif |
1da177e4 | 244 | } |
1da177e4 | 245 | |
b4819b59 | 246 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
61ef2489 | 247 | int page_is_ram(unsigned long pagenr) |
565200a1 AN |
248 | { |
249 | int i; | |
250 | ||
251 | for (i = 0; i < boot_mem_map.nr_map; i++) { | |
252 | unsigned long addr, end; | |
253 | ||
43064c0c DD |
254 | switch (boot_mem_map.map[i].type) { |
255 | case BOOT_MEM_RAM: | |
256 | case BOOT_MEM_INIT_RAM: | |
257 | break; | |
258 | default: | |
565200a1 AN |
259 | /* not usable memory */ |
260 | continue; | |
43064c0c | 261 | } |
565200a1 AN |
262 | |
263 | addr = PFN_UP(boot_mem_map.map[i].addr); | |
264 | end = PFN_DOWN(boot_mem_map.map[i].addr + | |
265 | boot_mem_map.map[i].size); | |
266 | ||
267 | if (pagenr >= addr && pagenr < end) | |
268 | return 1; | |
269 | } | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
1da177e4 LT |
274 | void __init paging_init(void) |
275 | { | |
cce335ae | 276 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
d3ce0e98 | 277 | unsigned long lastpfn __maybe_unused; |
1da177e4 LT |
278 | |
279 | pagetable_init(); | |
280 | ||
281 | #ifdef CONFIG_HIGHMEM | |
282 | kmap_init(); | |
283 | #endif | |
05502339 | 284 | #ifdef CONFIG_ZONE_DMA |
cce335ae | 285 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; |
1da177e4 | 286 | #endif |
cce335ae RB |
287 | #ifdef CONFIG_ZONE_DMA32 |
288 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; | |
289 | #endif | |
290 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
291 | lastpfn = max_low_pfn; | |
1da177e4 | 292 | #ifdef CONFIG_HIGHMEM |
cce335ae RB |
293 | max_zone_pfns[ZONE_HIGHMEM] = highend_pfn; |
294 | lastpfn = highend_pfn; | |
cbb8fc07 | 295 | |
cce335ae | 296 | if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) { |
cbb8fc07 | 297 | printk(KERN_WARNING "This processor doesn't support highmem." |
cce335ae RB |
298 | " %ldk highmem ignored\n", |
299 | (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10)); | |
300 | max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn; | |
301 | lastpfn = max_low_pfn; | |
cbb8fc07 | 302 | } |
1da177e4 LT |
303 | #endif |
304 | ||
cce335ae | 305 | free_area_init_nodes(max_zone_pfns); |
1da177e4 LT |
306 | } |
307 | ||
3d503753 DJ |
308 | #ifdef CONFIG_64BIT |
309 | static struct kcore_list kcore_kseg0; | |
310 | #endif | |
311 | ||
1132137e | 312 | static inline void mem_init_free_highmem(void) |
1da177e4 | 313 | { |
1132137e JL |
314 | #ifdef CONFIG_HIGHMEM |
315 | unsigned long tmp; | |
1da177e4 | 316 | |
1132137e JL |
317 | for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) { |
318 | struct page *page = pfn_to_page(tmp); | |
319 | ||
320 | if (!page_is_ram(tmp)) | |
321 | SetPageReserved(page); | |
322 | else | |
323 | free_highmem_page(page); | |
324 | } | |
325 | #endif | |
326 | } | |
327 | ||
ab9988a3 PB |
328 | unsigned __weak platform_maar_init(unsigned num_maars) |
329 | { | |
330 | return 0; | |
331 | } | |
332 | ||
333 | static void maar_init(void) | |
334 | { | |
335 | unsigned num_maars, used, i; | |
336 | ||
337 | if (!cpu_has_maar) | |
338 | return; | |
339 | ||
340 | /* Detect the number of MAARs */ | |
341 | write_c0_maari(~0); | |
342 | back_to_back_c0_hazard(); | |
343 | num_maars = read_c0_maari() + 1; | |
344 | ||
345 | /* MAARs should be in pairs */ | |
346 | WARN_ON(num_maars % 2); | |
347 | ||
348 | /* Configure the required MAARs */ | |
349 | used = platform_maar_init(num_maars / 2); | |
350 | ||
351 | /* Disable any further MAARs */ | |
352 | for (i = (used * 2); i < num_maars; i++) { | |
353 | write_c0_maari(i); | |
354 | back_to_back_c0_hazard(); | |
355 | write_c0_maar(0); | |
356 | back_to_back_c0_hazard(); | |
357 | } | |
358 | } | |
359 | ||
1132137e JL |
360 | void __init mem_init(void) |
361 | { | |
1da177e4 LT |
362 | #ifdef CONFIG_HIGHMEM |
363 | #ifdef CONFIG_DISCONTIGMEM | |
364 | #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet" | |
365 | #endif | |
b6da0ffb | 366 | max_mapnr = highend_pfn ? highend_pfn : max_low_pfn; |
1da177e4 | 367 | #else |
565200a1 | 368 | max_mapnr = max_low_pfn; |
1da177e4 LT |
369 | #endif |
370 | high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); | |
371 | ||
ab9988a3 | 372 | maar_init(); |
0c988534 | 373 | free_all_bootmem(); |
31605922 | 374 | setup_zero_pages(); /* Setup zeroed pages. */ |
1132137e JL |
375 | mem_init_free_highmem(); |
376 | mem_init_print_info(NULL); | |
1da177e4 | 377 | |
3d503753 DJ |
378 | #ifdef CONFIG_64BIT |
379 | if ((unsigned long) &_text > (unsigned long) CKSEG0) | |
380 | /* The -4 is a hack so that user tools don't have to handle | |
381 | the overflow. */ | |
c30bb2a2 KH |
382 | kclist_add(&kcore_kseg0, (void *) CKSEG0, |
383 | 0x80000000 - 4, KCORE_TEXT); | |
3d503753 | 384 | #endif |
1da177e4 | 385 | } |
b4819b59 | 386 | #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
1da177e4 | 387 | |
c44e8d5e | 388 | void free_init_pages(const char *what, unsigned long begin, unsigned long end) |
6fd11a21 | 389 | { |
acd86b86 | 390 | unsigned long pfn; |
6fd11a21 | 391 | |
acd86b86 FBH |
392 | for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) { |
393 | struct page *page = pfn_to_page(pfn); | |
394 | void *addr = phys_to_virt(PFN_PHYS(pfn)); | |
395 | ||
acd86b86 | 396 | memset(addr, POISON_FREE_INITMEM, PAGE_SIZE); |
31605922 | 397 | free_reserved_page(page); |
6fd11a21 RB |
398 | } |
399 | printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); | |
400 | } | |
401 | ||
1da177e4 LT |
402 | #ifdef CONFIG_BLK_DEV_INITRD |
403 | void free_initrd_mem(unsigned long start, unsigned long end) | |
404 | { | |
11199692 JL |
405 | free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, |
406 | "initrd"); | |
1da177e4 LT |
407 | } |
408 | #endif | |
409 | ||
0893d3fb MC |
410 | void (*free_init_pages_eva)(void *begin, void *end) = NULL; |
411 | ||
fb4bb133 | 412 | void __init_refok free_initmem(void) |
1da177e4 | 413 | { |
c44e8d5e | 414 | prom_free_prom_memory(); |
0893d3fb MC |
415 | /* |
416 | * Let the platform define a specific function to free the | |
417 | * init section since EVA may have used any possible mapping | |
418 | * between virtual and physical addresses. | |
419 | */ | |
420 | if (free_init_pages_eva) | |
421 | free_init_pages_eva((void *)&__init_begin, (void *)&__init_end); | |
422 | else | |
423 | free_initmem_default(POISON_FREE_INITMEM); | |
1da177e4 | 424 | } |
69a6c312 | 425 | |
82622284 | 426 | #ifndef CONFIG_MIPS_PGD_C0_CONTEXT |
69a6c312 | 427 | unsigned long pgd_current[NR_CPUS]; |
82622284 | 428 | #endif |
9975e77d RB |
429 | |
430 | /* | |
431 | * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER | |
432 | * are constants. So we use the variants from asm-offset.h until that gcc | |
433 | * will officially be retired. | |
485172b3 DD |
434 | * |
435 | * Align swapper_pg_dir in to 64K, allows its address to be loaded | |
436 | * with a single LUI instruction in the TLB handlers. If we used | |
437 | * __aligned(64K), its size would get rounded up to the alignment | |
438 | * size, and waste space. So we place it in its own section and align | |
439 | * it in the linker script. | |
9975e77d | 440 | */ |
485172b3 | 441 | pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(.bss..swapper_pg_dir); |
325f8a0a | 442 | #ifndef __PAGETABLE_PMD_FOLDED |
485172b3 | 443 | pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss; |
69a6c312 | 444 | #endif |
485172b3 | 445 | pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss; |