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/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>
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>
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>
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) \
53 unsigned int mvpflags; \
54 local_irq_save(flags);\
56 #define EXIT_CRITICAL(flags) \
58 local_irq_restore(flags); \
62 #define ENTER_CRITICAL(flags) local_irq_save(flags)
63 #define EXIT_CRITICAL(flags) local_irq_restore(flags)
65 #endif /* CONFIG_MIPS_MT_SMTC */
67 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
70 * We have up to 8 empty zeroed pages so we can map one of the right colour
71 * when needed. This is necessary only on R4000 / R4400 SC and MC versions
72 * where we have to avoid VCED / VECI exceptions for good performance at
73 * any price. Since page is never written to after the initialization we
74 * don't have to care about aliases on other CPUs.
76 unsigned long empty_zero_page, zero_page_mask;
77 EXPORT_SYMBOL_GPL(empty_zero_page);
80 * Not static inline because used by IP27 special magic initialization code
82 unsigned long setup_zero_pages(void)
93 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
95 panic("Oh boy, that early out of memory?");
97 page = virt_to_page((void *)empty_zero_page);
98 split_page(page, order);
99 while (page < virt_to_page((void *)(empty_zero_page + (PAGE_SIZE << order)))) {
100 SetPageReserved(page);
104 size = PAGE_SIZE << order;
105 zero_page_mask = (size - 1) & PAGE_MASK;
110 #ifdef CONFIG_MIPS_MT_SMTC
111 static pte_t *kmap_coherent_pte;
112 static void __init kmap_coherent_init(void)
116 /* cache the first coherent kmap pte */
117 vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
118 kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
121 static inline void kmap_coherent_init(void) {}
124 void *kmap_coherent(struct page *page, unsigned long addr)
126 enum fixed_addresses idx;
127 unsigned long vaddr, flags, entrylo;
128 unsigned long old_ctx;
132 BUG_ON(Page_dcache_dirty(page));
135 idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
136 #ifdef CONFIG_MIPS_MT_SMTC
137 idx += FIX_N_COLOURS * smp_processor_id() +
138 (in_interrupt() ? (FIX_N_COLOURS * NR_CPUS) : 0);
140 idx += in_interrupt() ? FIX_N_COLOURS : 0;
142 vaddr = __fix_to_virt(FIX_CMAP_END - idx);
143 pte = mk_pte(page, PAGE_KERNEL);
144 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
145 entrylo = pte.pte_high;
147 entrylo = pte_to_entrylo(pte_val(pte));
150 ENTER_CRITICAL(flags);
151 old_ctx = read_c0_entryhi();
152 write_c0_entryhi(vaddr & (PAGE_MASK << 1));
153 write_c0_entrylo0(entrylo);
154 write_c0_entrylo1(entrylo);
155 #ifdef CONFIG_MIPS_MT_SMTC
156 set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
157 /* preload TLB instead of local_flush_tlb_one() */
161 tlbidx = read_c0_index();
168 tlbidx = read_c0_wired();
169 write_c0_wired(tlbidx + 1);
170 write_c0_index(tlbidx);
175 write_c0_entryhi(old_ctx);
176 EXIT_CRITICAL(flags);
178 return (void*) vaddr;
181 #define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
183 void kunmap_coherent(void)
185 #ifndef CONFIG_MIPS_MT_SMTC
187 unsigned long flags, old_ctx;
189 ENTER_CRITICAL(flags);
190 old_ctx = read_c0_entryhi();
191 wired = read_c0_wired() - 1;
192 write_c0_wired(wired);
193 write_c0_index(wired);
194 write_c0_entryhi(UNIQUE_ENTRYHI(wired));
195 write_c0_entrylo0(0);
196 write_c0_entrylo1(0);
200 write_c0_entryhi(old_ctx);
201 EXIT_CRITICAL(flags);
204 preempt_check_resched();
207 void copy_user_highpage(struct page *to, struct page *from,
208 unsigned long vaddr, struct vm_area_struct *vma)
212 vto = kmap_atomic(to, KM_USER1);
213 if (cpu_has_dc_aliases &&
214 page_mapped(from) && !Page_dcache_dirty(from)) {
215 vfrom = kmap_coherent(from, vaddr);
216 copy_page(vto, vfrom);
219 vfrom = kmap_atomic(from, KM_USER0);
220 copy_page(vto, vfrom);
221 kunmap_atomic(vfrom, KM_USER0);
223 if ((!cpu_has_ic_fills_f_dc) ||
224 pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
225 flush_data_cache_page((unsigned long)vto);
226 kunmap_atomic(vto, KM_USER1);
227 /* Make sure this page is cleared on other CPU's too before using it */
231 void copy_to_user_page(struct vm_area_struct *vma,
232 struct page *page, unsigned long vaddr, void *dst, const void *src,
235 if (cpu_has_dc_aliases &&
236 page_mapped(page) && !Page_dcache_dirty(page)) {
237 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
238 memcpy(vto, src, len);
241 memcpy(dst, src, len);
242 if (cpu_has_dc_aliases)
243 SetPageDcacheDirty(page);
245 if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
246 flush_cache_page(vma, vaddr, page_to_pfn(page));
249 void copy_from_user_page(struct vm_area_struct *vma,
250 struct page *page, unsigned long vaddr, void *dst, const void *src,
253 if (cpu_has_dc_aliases &&
254 page_mapped(page) && !Page_dcache_dirty(page)) {
255 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
256 memcpy(dst, vfrom, len);
259 memcpy(dst, src, len);
260 if (cpu_has_dc_aliases)
261 SetPageDcacheDirty(page);
265 void __init fixrange_init(unsigned long start, unsigned long end,
268 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
277 i = __pgd_offset(vaddr);
278 j = __pud_offset(vaddr);
279 k = __pmd_offset(vaddr);
282 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
284 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
286 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
287 if (pmd_none(*pmd)) {
288 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
289 set_pmd(pmd, __pmd((unsigned long)pte));
290 BUG_ON(pte != pte_offset_kernel(pmd, 0));
301 #ifndef CONFIG_NEED_MULTIPLE_NODES
302 int page_is_ram(unsigned long pagenr)
306 for (i = 0; i < boot_mem_map.nr_map; i++) {
307 unsigned long addr, end;
309 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
310 /* not usable memory */
313 addr = PFN_UP(boot_mem_map.map[i].addr);
314 end = PFN_DOWN(boot_mem_map.map[i].addr +
315 boot_mem_map.map[i].size);
317 if (pagenr >= addr && pagenr < end)
324 void __init paging_init(void)
326 unsigned long max_zone_pfns[MAX_NR_ZONES];
327 unsigned long lastpfn;
331 #ifdef CONFIG_HIGHMEM
334 kmap_coherent_init();
336 #ifdef CONFIG_ZONE_DMA
337 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
339 #ifdef CONFIG_ZONE_DMA32
340 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
342 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
343 lastpfn = max_low_pfn;
344 #ifdef CONFIG_HIGHMEM
345 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
346 lastpfn = highend_pfn;
348 if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
349 printk(KERN_WARNING "This processor doesn't support highmem."
350 " %ldk highmem ignored\n",
351 (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
352 max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
353 lastpfn = max_low_pfn;
357 free_area_init_nodes(max_zone_pfns);
361 static struct kcore_list kcore_kseg0;
364 void __init mem_init(void)
366 unsigned long codesize, reservedpages, datasize, initsize;
367 unsigned long tmp, ram;
369 #ifdef CONFIG_HIGHMEM
370 #ifdef CONFIG_DISCONTIGMEM
371 #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
373 max_mapnr = highend_pfn;
375 max_mapnr = max_low_pfn;
377 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
379 totalram_pages += free_all_bootmem();
380 totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
382 reservedpages = ram = 0;
383 for (tmp = 0; tmp < max_low_pfn; tmp++)
384 if (page_is_ram(tmp)) {
386 if (PageReserved(pfn_to_page(tmp)))
391 #ifdef CONFIG_HIGHMEM
392 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
393 struct page *page = pfn_to_page(tmp);
395 if (!page_is_ram(tmp)) {
396 SetPageReserved(page);
399 ClearPageReserved(page);
400 init_page_count(page);
404 totalram_pages += totalhigh_pages;
405 num_physpages += totalhigh_pages;
408 codesize = (unsigned long) &_etext - (unsigned long) &_text;
409 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
410 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
413 if ((unsigned long) &_text > (unsigned long) CKSEG0)
414 /* The -4 is a hack so that user tools don't have to handle
416 kclist_add(&kcore_kseg0, (void *) CKSEG0,
417 0x80000000 - 4, KCORE_TEXT);
420 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
421 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
422 nr_free_pages() << (PAGE_SHIFT-10),
423 ram << (PAGE_SHIFT-10),
425 reservedpages << (PAGE_SHIFT-10),
428 totalhigh_pages << (PAGE_SHIFT-10));
430 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
432 void free_init_pages(const char *what, unsigned long begin, unsigned long end)
436 for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
437 struct page *page = pfn_to_page(pfn);
438 void *addr = phys_to_virt(PFN_PHYS(pfn));
440 ClearPageReserved(page);
441 init_page_count(page);
442 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
446 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
449 #ifdef CONFIG_BLK_DEV_INITRD
450 void free_initrd_mem(unsigned long start, unsigned long end)
452 free_init_pages("initrd memory",
453 virt_to_phys((void *)start),
454 virt_to_phys((void *)end));
458 void __init_refok free_initmem(void)
460 prom_free_prom_memory();
461 free_init_pages("unused kernel memory",
462 __pa_symbol(&__init_begin),
463 __pa_symbol(&__init_end));
466 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
467 unsigned long pgd_current[NR_CPUS];
470 * On 64-bit we've got three-level pagetables with a slightly
471 * different layout ...
473 #define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
476 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
477 * are constants. So we use the variants from asm-offset.h until that gcc
478 * will officially be retired.
480 pgd_t swapper_pg_dir[_PTRS_PER_PGD] __page_aligned(_PGD_ORDER);
481 #ifndef __PAGETABLE_PMD_FOLDED
482 pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned(PMD_ORDER);
484 pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);