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
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/kernel.h>
17 #include <linux/errno.h>
18 #include <linux/string.h>
19 #include <linux/types.h>
20 #include <linux/pagemap.h>
21 #include <linux/ptrace.h>
22 #include <linux/mman.h>
24 #include <linux/bootmem.h>
25 #include <linux/highmem.h>
26 #include <linux/swap.h>
27 #include <linux/proc_fs.h>
28 #include <linux/pfn.h>
30 #include <asm/asm-offsets.h>
31 #include <asm/bootinfo.h>
32 #include <asm/cachectl.h>
35 #include <asm/kmap_types.h>
36 #include <asm/mmu_context.h>
37 #include <asm/sections.h>
38 #include <asm/pgtable.h>
39 #include <asm/pgalloc.h>
41 #include <asm/fixmap.h>
43 /* Atomicity and interruptability */
44 #ifdef CONFIG_MIPS_MT_SMTC
46 #include <asm/mipsmtregs.h>
48 #define ENTER_CRITICAL(flags) \
50 unsigned int mvpflags; \
51 local_irq_save(flags);\
53 #define EXIT_CRITICAL(flags) \
55 local_irq_restore(flags); \
59 #define ENTER_CRITICAL(flags) local_irq_save(flags)
60 #define EXIT_CRITICAL(flags) local_irq_restore(flags)
62 #endif /* CONFIG_MIPS_MT_SMTC */
64 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
67 * We have up to 8 empty zeroed pages so we can map one of the right colour
68 * when needed. This is necessary only on R4000 / R4400 SC and MC versions
69 * where we have to avoid VCED / VECI exceptions for good performance at
70 * any price. Since page is never written to after the initialization we
71 * don't have to care about aliases on other CPUs.
73 unsigned long empty_zero_page, zero_page_mask;
76 * Not static inline because used by IP27 special magic initialization code
78 unsigned long setup_zero_pages(void)
89 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
91 panic("Oh boy, that early out of memory?");
93 page = virt_to_page((void *)empty_zero_page);
94 split_page(page, order);
95 while (page < virt_to_page((void *)(empty_zero_page + (PAGE_SIZE << order)))) {
96 SetPageReserved(page);
100 size = PAGE_SIZE << order;
101 zero_page_mask = (size - 1) & PAGE_MASK;
107 * These are almost like kmap_atomic / kunmap_atmic except they take an
108 * additional address argument as the hint.
111 #define kmap_get_fixmap_pte(vaddr) \
112 pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
114 #ifdef CONFIG_MIPS_MT_SMTC
115 static pte_t *kmap_coherent_pte;
116 static void __init kmap_coherent_init(void)
120 /* cache the first coherent kmap pte */
121 vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
122 kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
125 static inline void kmap_coherent_init(void) {}
128 void *kmap_coherent(struct page *page, unsigned long addr)
130 enum fixed_addresses idx;
131 unsigned long vaddr, flags, entrylo;
132 unsigned long old_ctx;
136 BUG_ON(Page_dcache_dirty(page));
139 idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
140 #ifdef CONFIG_MIPS_MT_SMTC
141 idx += FIX_N_COLOURS * smp_processor_id();
143 vaddr = __fix_to_virt(FIX_CMAP_END - idx);
144 pte = mk_pte(page, PAGE_KERNEL);
145 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
146 entrylo = pte.pte_high;
148 entrylo = pte_val(pte) >> 6;
151 ENTER_CRITICAL(flags);
152 old_ctx = read_c0_entryhi();
153 write_c0_entryhi(vaddr & (PAGE_MASK << 1));
154 write_c0_entrylo0(entrylo);
155 write_c0_entrylo1(entrylo);
156 #ifdef CONFIG_MIPS_MT_SMTC
157 set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
158 /* preload TLB instead of local_flush_tlb_one() */
162 tlbidx = read_c0_index();
169 tlbidx = read_c0_wired();
170 write_c0_wired(tlbidx + 1);
171 write_c0_index(tlbidx);
176 write_c0_entryhi(old_ctx);
177 EXIT_CRITICAL(flags);
179 return (void*) vaddr;
182 #define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
184 void kunmap_coherent(void)
186 #ifndef CONFIG_MIPS_MT_SMTC
188 unsigned long flags, old_ctx;
190 ENTER_CRITICAL(flags);
191 old_ctx = read_c0_entryhi();
192 wired = read_c0_wired() - 1;
193 write_c0_wired(wired);
194 write_c0_index(wired);
195 write_c0_entryhi(UNIQUE_ENTRYHI(wired));
196 write_c0_entrylo0(0);
197 write_c0_entrylo1(0);
201 write_c0_entryhi(old_ctx);
202 EXIT_CRITICAL(flags);
205 preempt_check_resched();
208 void copy_user_highpage(struct page *to, struct page *from,
209 unsigned long vaddr, struct vm_area_struct *vma)
213 vto = kmap_atomic(to, KM_USER1);
214 if (cpu_has_dc_aliases &&
215 page_mapped(from) && !Page_dcache_dirty(from)) {
216 vfrom = kmap_coherent(from, vaddr);
217 copy_page(vto, vfrom);
220 vfrom = kmap_atomic(from, KM_USER0);
221 copy_page(vto, vfrom);
222 kunmap_atomic(vfrom, KM_USER0);
224 if ((!cpu_has_ic_fills_f_dc) ||
225 pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
226 flush_data_cache_page((unsigned long)vto);
227 kunmap_atomic(vto, KM_USER1);
228 /* Make sure this page is cleared on other CPU's too before using it */
232 void copy_to_user_page(struct vm_area_struct *vma,
233 struct page *page, unsigned long vaddr, void *dst, const void *src,
236 if (cpu_has_dc_aliases &&
237 page_mapped(page) && !Page_dcache_dirty(page)) {
238 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
239 memcpy(vto, src, len);
242 memcpy(dst, src, len);
243 if (cpu_has_dc_aliases)
244 SetPageDcacheDirty(page);
246 if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
247 flush_cache_page(vma, vaddr, page_to_pfn(page));
250 EXPORT_SYMBOL(copy_to_user_page);
252 void copy_from_user_page(struct vm_area_struct *vma,
253 struct page *page, unsigned long vaddr, void *dst, const void *src,
256 if (cpu_has_dc_aliases &&
257 page_mapped(page) && !Page_dcache_dirty(page)) {
258 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
259 memcpy(dst, vfrom, len);
262 memcpy(dst, src, len);
263 if (cpu_has_dc_aliases)
264 SetPageDcacheDirty(page);
268 EXPORT_SYMBOL(copy_from_user_page);
271 #ifdef CONFIG_HIGHMEM
272 unsigned long highstart_pfn, highend_pfn;
277 static void __init kmap_init(void)
279 unsigned long kmap_vstart;
281 /* cache the first kmap pte */
282 kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
283 kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
285 kmap_prot = PAGE_KERNEL;
287 #endif /* CONFIG_HIGHMEM */
289 void __init fixrange_init(unsigned long start, unsigned long end,
292 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
301 i = __pgd_offset(vaddr);
302 j = __pud_offset(vaddr);
303 k = __pmd_offset(vaddr);
306 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
308 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
310 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
311 if (pmd_none(*pmd)) {
312 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
313 set_pmd(pmd, __pmd((unsigned long)pte));
314 if (pte != pte_offset_kernel(pmd, 0))
326 #ifndef CONFIG_NEED_MULTIPLE_NODES
327 static int __init page_is_ram(unsigned long pagenr)
331 for (i = 0; i < boot_mem_map.nr_map; i++) {
332 unsigned long addr, end;
334 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
335 /* not usable memory */
338 addr = PFN_UP(boot_mem_map.map[i].addr);
339 end = PFN_DOWN(boot_mem_map.map[i].addr +
340 boot_mem_map.map[i].size);
342 if (pagenr >= addr && pagenr < end)
349 void __init paging_init(void)
351 unsigned long max_zone_pfns[MAX_NR_ZONES];
352 unsigned long lastpfn;
356 #ifdef CONFIG_HIGHMEM
359 kmap_coherent_init();
361 #ifdef CONFIG_ZONE_DMA
362 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
364 #ifdef CONFIG_ZONE_DMA32
365 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
367 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
368 lastpfn = max_low_pfn;
369 #ifdef CONFIG_HIGHMEM
370 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
371 lastpfn = highend_pfn;
373 if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
374 printk(KERN_WARNING "This processor doesn't support highmem."
375 " %ldk highmem ignored\n",
376 (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
377 max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
378 lastpfn = max_low_pfn;
382 free_area_init_nodes(max_zone_pfns);
385 static struct kcore_list kcore_mem, kcore_vmalloc;
387 static struct kcore_list kcore_kseg0;
390 void __init mem_init(void)
392 unsigned long codesize, reservedpages, datasize, initsize;
393 unsigned long tmp, ram;
395 #ifdef CONFIG_HIGHMEM
396 #ifdef CONFIG_DISCONTIGMEM
397 #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
399 max_mapnr = highend_pfn;
401 max_mapnr = max_low_pfn;
403 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
405 totalram_pages += free_all_bootmem();
406 totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
408 reservedpages = ram = 0;
409 for (tmp = 0; tmp < max_low_pfn; tmp++)
410 if (page_is_ram(tmp)) {
412 if (PageReserved(pfn_to_page(tmp)))
417 #ifdef CONFIG_HIGHMEM
418 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
419 struct page *page = pfn_to_page(tmp);
421 if (!page_is_ram(tmp)) {
422 SetPageReserved(page);
425 ClearPageReserved(page);
426 init_page_count(page);
430 totalram_pages += totalhigh_pages;
431 num_physpages += totalhigh_pages;
434 codesize = (unsigned long) &_etext - (unsigned long) &_text;
435 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
436 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
439 if ((unsigned long) &_text > (unsigned long) CKSEG0)
440 /* The -4 is a hack so that user tools don't have to handle
442 kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4);
444 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
445 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
446 VMALLOC_END-VMALLOC_START);
448 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
449 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
450 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
451 ram << (PAGE_SHIFT-10),
453 reservedpages << (PAGE_SHIFT-10),
456 (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
458 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
460 void free_init_pages(const char *what, unsigned long begin, unsigned long end)
464 for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
465 struct page *page = pfn_to_page(pfn);
466 void *addr = phys_to_virt(PFN_PHYS(pfn));
468 ClearPageReserved(page);
469 init_page_count(page);
470 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
474 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
477 #ifdef CONFIG_BLK_DEV_INITRD
478 void free_initrd_mem(unsigned long start, unsigned long end)
480 free_init_pages("initrd memory",
481 virt_to_phys((void *)start),
482 virt_to_phys((void *)end));
486 void __init_refok free_initmem(void)
488 prom_free_prom_memory();
489 free_init_pages("unused kernel memory",
490 __pa_symbol(&__init_begin),
491 __pa_symbol(&__init_end));
494 unsigned long pgd_current[NR_CPUS];
496 * On 64-bit we've got three-level pagetables with a slightly
497 * different layout ...
499 #define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
502 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
503 * are constants. So we use the variants from asm-offset.h until that gcc
504 * will officially be retired.
506 pgd_t swapper_pg_dir[_PTRS_PER_PGD] __page_aligned(_PGD_ORDER);
509 pgd_t module_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER);
511 pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned(PMD_ORDER);
513 pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);