Merge remote-tracking branch 's5p/for-next'
[linux-2.6/next.git] / arch / mips / mm / init.c
blobb7ebc4fa89bcd5b4b77465ab60919317b513bf79
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.
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.
11 #include <linux/bug.h>
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/signal.h>
15 #include <linux/sched.h>
16 #include <linux/smp.h>
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>
28 #include <linux/proc_fs.h>
29 #include <linux/pfn.h>
30 #include <linux/hardirq.h>
31 #include <linux/gfp.h>
33 #include <asm/asm-offsets.h>
34 #include <asm/bootinfo.h>
35 #include <asm/cachectl.h>
36 #include <asm/cpu.h>
37 #include <asm/dma.h>
38 #include <asm/kmap_types.h>
39 #include <asm/mmu_context.h>
40 #include <asm/sections.h>
41 #include <asm/pgtable.h>
42 #include <asm/pgalloc.h>
43 #include <asm/tlb.h>
44 #include <asm/fixmap.h>
46 /* Atomicity and interruptability */
47 #ifdef CONFIG_MIPS_MT_SMTC
49 #include <asm/mipsmtregs.h>
51 #define ENTER_CRITICAL(flags) \
52 { \
53 unsigned int mvpflags; \
54 local_irq_save(flags);\
55 mvpflags = dvpe()
56 #define EXIT_CRITICAL(flags) \
57 evpe(mvpflags); \
58 local_irq_restore(flags); \
60 #else
62 #define ENTER_CRITICAL(flags) local_irq_save(flags)
63 #define EXIT_CRITICAL(flags) local_irq_restore(flags)
65 #endif /* CONFIG_MIPS_MT_SMTC */
68 * We have up to 8 empty zeroed pages so we can map one of the right colour
69 * when needed. This is necessary only on R4000 / R4400 SC and MC versions
70 * where we have to avoid VCED / VECI exceptions for good performance at
71 * any price. Since page is never written to after the initialization we
72 * don't have to care about aliases on other CPUs.
74 unsigned long empty_zero_page, zero_page_mask;
75 EXPORT_SYMBOL_GPL(empty_zero_page);
78 * Not static inline because used by IP27 special magic initialization code
80 unsigned long setup_zero_pages(void)
82 unsigned int order;
83 unsigned long size;
84 struct page *page;
86 if (cpu_has_vce)
87 order = 3;
88 else
89 order = 0;
91 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
92 if (!empty_zero_page)
93 panic("Oh boy, that early out of memory?");
95 page = virt_to_page((void *)empty_zero_page);
96 split_page(page, order);
97 while (page < virt_to_page((void *)(empty_zero_page + (PAGE_SIZE << order)))) {
98 SetPageReserved(page);
99 page++;
102 size = PAGE_SIZE << order;
103 zero_page_mask = (size - 1) & PAGE_MASK;
105 return 1UL << order;
108 #ifdef CONFIG_MIPS_MT_SMTC
109 static pte_t *kmap_coherent_pte;
110 static void __init kmap_coherent_init(void)
112 unsigned long vaddr;
114 /* cache the first coherent kmap pte */
115 vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
116 kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
118 #else
119 static inline void kmap_coherent_init(void) {}
120 #endif
122 void *kmap_coherent(struct page *page, unsigned long addr)
124 enum fixed_addresses idx;
125 unsigned long vaddr, flags, entrylo;
126 unsigned long old_ctx;
127 pte_t pte;
128 int tlbidx;
130 BUG_ON(Page_dcache_dirty(page));
132 inc_preempt_count();
133 idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
134 #ifdef CONFIG_MIPS_MT_SMTC
135 idx += FIX_N_COLOURS * smp_processor_id() +
136 (in_interrupt() ? (FIX_N_COLOURS * NR_CPUS) : 0);
137 #else
138 idx += in_interrupt() ? FIX_N_COLOURS : 0;
139 #endif
140 vaddr = __fix_to_virt(FIX_CMAP_END - idx);
141 pte = mk_pte(page, PAGE_KERNEL);
142 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
143 entrylo = pte.pte_high;
144 #else
145 entrylo = pte_to_entrylo(pte_val(pte));
146 #endif
148 ENTER_CRITICAL(flags);
149 old_ctx = read_c0_entryhi();
150 write_c0_entryhi(vaddr & (PAGE_MASK << 1));
151 write_c0_entrylo0(entrylo);
152 write_c0_entrylo1(entrylo);
153 #ifdef CONFIG_MIPS_MT_SMTC
154 set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
155 /* preload TLB instead of local_flush_tlb_one() */
156 mtc0_tlbw_hazard();
157 tlb_probe();
158 tlb_probe_hazard();
159 tlbidx = read_c0_index();
160 mtc0_tlbw_hazard();
161 if (tlbidx < 0)
162 tlb_write_random();
163 else
164 tlb_write_indexed();
165 #else
166 tlbidx = read_c0_wired();
167 write_c0_wired(tlbidx + 1);
168 write_c0_index(tlbidx);
169 mtc0_tlbw_hazard();
170 tlb_write_indexed();
171 #endif
172 tlbw_use_hazard();
173 write_c0_entryhi(old_ctx);
174 EXIT_CRITICAL(flags);
176 return (void*) vaddr;
179 #define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
181 void kunmap_coherent(void)
183 #ifndef CONFIG_MIPS_MT_SMTC
184 unsigned int wired;
185 unsigned long flags, old_ctx;
187 ENTER_CRITICAL(flags);
188 old_ctx = read_c0_entryhi();
189 wired = read_c0_wired() - 1;
190 write_c0_wired(wired);
191 write_c0_index(wired);
192 write_c0_entryhi(UNIQUE_ENTRYHI(wired));
193 write_c0_entrylo0(0);
194 write_c0_entrylo1(0);
195 mtc0_tlbw_hazard();
196 tlb_write_indexed();
197 tlbw_use_hazard();
198 write_c0_entryhi(old_ctx);
199 EXIT_CRITICAL(flags);
200 #endif
201 dec_preempt_count();
202 preempt_check_resched();
205 void copy_user_highpage(struct page *to, struct page *from,
206 unsigned long vaddr, struct vm_area_struct *vma)
208 void *vfrom, *vto;
210 vto = kmap_atomic(to, KM_USER1);
211 if (cpu_has_dc_aliases &&
212 page_mapped(from) && !Page_dcache_dirty(from)) {
213 vfrom = kmap_coherent(from, vaddr);
214 copy_page(vto, vfrom);
215 kunmap_coherent();
216 } else {
217 vfrom = kmap_atomic(from, KM_USER0);
218 copy_page(vto, vfrom);
219 kunmap_atomic(vfrom, KM_USER0);
221 if ((!cpu_has_ic_fills_f_dc) ||
222 pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
223 flush_data_cache_page((unsigned long)vto);
224 kunmap_atomic(vto, KM_USER1);
225 /* Make sure this page is cleared on other CPU's too before using it */
226 smp_wmb();
229 void copy_to_user_page(struct vm_area_struct *vma,
230 struct page *page, unsigned long vaddr, void *dst, const void *src,
231 unsigned long len)
233 if (cpu_has_dc_aliases &&
234 page_mapped(page) && !Page_dcache_dirty(page)) {
235 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
236 memcpy(vto, src, len);
237 kunmap_coherent();
238 } else {
239 memcpy(dst, src, len);
240 if (cpu_has_dc_aliases)
241 SetPageDcacheDirty(page);
243 if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
244 flush_cache_page(vma, vaddr, page_to_pfn(page));
247 void copy_from_user_page(struct vm_area_struct *vma,
248 struct page *page, unsigned long vaddr, void *dst, const void *src,
249 unsigned long len)
251 if (cpu_has_dc_aliases &&
252 page_mapped(page) && !Page_dcache_dirty(page)) {
253 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
254 memcpy(dst, vfrom, len);
255 kunmap_coherent();
256 } else {
257 memcpy(dst, src, len);
258 if (cpu_has_dc_aliases)
259 SetPageDcacheDirty(page);
263 void __init fixrange_init(unsigned long start, unsigned long end,
264 pgd_t *pgd_base)
266 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
267 pgd_t *pgd;
268 pud_t *pud;
269 pmd_t *pmd;
270 pte_t *pte;
271 int i, j, k;
272 unsigned long vaddr;
274 vaddr = start;
275 i = __pgd_offset(vaddr);
276 j = __pud_offset(vaddr);
277 k = __pmd_offset(vaddr);
278 pgd = pgd_base + i;
280 for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
281 pud = (pud_t *)pgd;
282 for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) {
283 pmd = (pmd_t *)pud;
284 for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) {
285 if (pmd_none(*pmd)) {
286 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
287 set_pmd(pmd, __pmd((unsigned long)pte));
288 BUG_ON(pte != pte_offset_kernel(pmd, 0));
290 vaddr += PMD_SIZE;
292 k = 0;
294 j = 0;
296 #endif
299 #ifndef CONFIG_NEED_MULTIPLE_NODES
300 int page_is_ram(unsigned long pagenr)
302 int i;
304 for (i = 0; i < boot_mem_map.nr_map; i++) {
305 unsigned long addr, end;
307 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
308 /* not usable memory */
309 continue;
311 addr = PFN_UP(boot_mem_map.map[i].addr);
312 end = PFN_DOWN(boot_mem_map.map[i].addr +
313 boot_mem_map.map[i].size);
315 if (pagenr >= addr && pagenr < end)
316 return 1;
319 return 0;
322 void __init paging_init(void)
324 unsigned long max_zone_pfns[MAX_NR_ZONES];
325 unsigned long lastpfn __maybe_unused;
327 pagetable_init();
329 #ifdef CONFIG_HIGHMEM
330 kmap_init();
331 #endif
332 kmap_coherent_init();
334 #ifdef CONFIG_ZONE_DMA
335 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
336 #endif
337 #ifdef CONFIG_ZONE_DMA32
338 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
339 #endif
340 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
341 lastpfn = max_low_pfn;
342 #ifdef CONFIG_HIGHMEM
343 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
344 lastpfn = highend_pfn;
346 if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
347 printk(KERN_WARNING "This processor doesn't support highmem."
348 " %ldk highmem ignored\n",
349 (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
350 max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
351 lastpfn = max_low_pfn;
353 #endif
355 free_area_init_nodes(max_zone_pfns);
358 #ifdef CONFIG_64BIT
359 static struct kcore_list kcore_kseg0;
360 #endif
362 void __init mem_init(void)
364 unsigned long codesize, reservedpages, datasize, initsize;
365 unsigned long tmp, ram;
367 #ifdef CONFIG_HIGHMEM
368 #ifdef CONFIG_DISCONTIGMEM
369 #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
370 #endif
371 max_mapnr = highend_pfn ? highend_pfn : max_low_pfn;
372 #else
373 max_mapnr = max_low_pfn;
374 #endif
375 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
377 totalram_pages += free_all_bootmem();
378 totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
380 reservedpages = ram = 0;
381 for (tmp = 0; tmp < max_low_pfn; tmp++)
382 if (page_is_ram(tmp)) {
383 ram++;
384 if (PageReserved(pfn_to_page(tmp)))
385 reservedpages++;
387 num_physpages = ram;
389 #ifdef CONFIG_HIGHMEM
390 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
391 struct page *page = pfn_to_page(tmp);
393 if (!page_is_ram(tmp)) {
394 SetPageReserved(page);
395 continue;
397 ClearPageReserved(page);
398 init_page_count(page);
399 __free_page(page);
400 totalhigh_pages++;
402 totalram_pages += totalhigh_pages;
403 num_physpages += totalhigh_pages;
404 #endif
406 codesize = (unsigned long) &_etext - (unsigned long) &_text;
407 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
408 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
410 #ifdef CONFIG_64BIT
411 if ((unsigned long) &_text > (unsigned long) CKSEG0)
412 /* The -4 is a hack so that user tools don't have to handle
413 the overflow. */
414 kclist_add(&kcore_kseg0, (void *) CKSEG0,
415 0x80000000 - 4, KCORE_TEXT);
416 #endif
418 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
419 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
420 nr_free_pages() << (PAGE_SHIFT-10),
421 ram << (PAGE_SHIFT-10),
422 codesize >> 10,
423 reservedpages << (PAGE_SHIFT-10),
424 datasize >> 10,
425 initsize >> 10,
426 totalhigh_pages << (PAGE_SHIFT-10));
428 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
430 void free_init_pages(const char *what, unsigned long begin, unsigned long end)
432 unsigned long pfn;
434 for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
435 struct page *page = pfn_to_page(pfn);
436 void *addr = phys_to_virt(PFN_PHYS(pfn));
438 ClearPageReserved(page);
439 init_page_count(page);
440 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
441 __free_page(page);
442 totalram_pages++;
444 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
447 #ifdef CONFIG_BLK_DEV_INITRD
448 void free_initrd_mem(unsigned long start, unsigned long end)
450 free_init_pages("initrd memory",
451 virt_to_phys((void *)start),
452 virt_to_phys((void *)end));
454 #endif
456 void __init_refok free_initmem(void)
458 prom_free_prom_memory();
459 free_init_pages("unused kernel memory",
460 __pa_symbol(&__init_begin),
461 __pa_symbol(&__init_end));
464 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
465 unsigned long pgd_current[NR_CPUS];
466 #endif
468 * On 64-bit we've got three-level pagetables with a slightly
469 * different layout ...
471 #define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
474 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
475 * are constants. So we use the variants from asm-offset.h until that gcc
476 * will officially be retired.
478 pgd_t swapper_pg_dir[_PTRS_PER_PGD] __page_aligned(_PGD_ORDER);
479 #ifndef __PAGETABLE_PMD_FOLDED
480 pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned(PMD_ORDER);
481 #endif
482 pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);