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/init.h>
12 #include <linux/module.h>
13 #include <linux/signal.h>
14 #include <linux/sched.h>
15 #include <linux/kernel.h>
16 #include <linux/errno.h>
17 #include <linux/string.h>
18 #include <linux/types.h>
19 #include <linux/pagemap.h>
20 #include <linux/ptrace.h>
21 #include <linux/mman.h>
23 #include <linux/bootmem.h>
24 #include <linux/highmem.h>
25 #include <linux/swap.h>
26 #include <linux/proc_fs.h>
27 #include <linux/pfn.h>
29 #include <asm/bootinfo.h>
30 #include <asm/cachectl.h>
33 #include <asm/kmap_types.h>
34 #include <asm/mmu_context.h>
35 #include <asm/sections.h>
36 #include <asm/pgtable.h>
37 #include <asm/pgalloc.h>
39 #include <asm/fixmap.h>
41 /* Atomicity and interruptability */
42 #ifdef CONFIG_MIPS_MT_SMTC
44 #include <asm/mipsmtregs.h>
46 #define ENTER_CRITICAL(flags) \
48 unsigned int mvpflags; \
49 local_irq_save(flags);\
51 #define EXIT_CRITICAL(flags) \
53 local_irq_restore(flags); \
57 #define ENTER_CRITICAL(flags) local_irq_save(flags)
58 #define EXIT_CRITICAL(flags) local_irq_restore(flags)
60 #endif /* CONFIG_MIPS_MT_SMTC */
62 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
64 unsigned long highstart_pfn, highend_pfn;
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 static inline 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;
137 idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
138 #ifdef CONFIG_MIPS_MT_SMTC
139 idx += FIX_N_COLOURS * smp_processor_id();
141 vaddr = __fix_to_virt(FIX_CMAP_END - idx);
142 pte = mk_pte(page, PAGE_KERNEL);
143 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
144 entrylo = pte.pte_high;
146 entrylo = pte_val(pte) >> 6;
149 ENTER_CRITICAL(flags);
150 old_ctx = read_c0_entryhi();
151 write_c0_entryhi(vaddr & (PAGE_MASK << 1));
152 write_c0_entrylo0(entrylo);
153 write_c0_entrylo1(entrylo);
154 #ifdef CONFIG_MIPS_MT_SMTC
155 set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
156 /* preload TLB instead of local_flush_tlb_one() */
160 tlbidx = read_c0_index();
167 tlbidx = read_c0_wired();
168 write_c0_wired(tlbidx + 1);
169 write_c0_index(tlbidx);
174 write_c0_entryhi(old_ctx);
175 EXIT_CRITICAL(flags);
177 return (void*) vaddr;
180 #define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
182 static inline void kunmap_coherent(struct page *page)
184 #ifndef CONFIG_MIPS_MT_SMTC
186 unsigned long flags, old_ctx;
188 ENTER_CRITICAL(flags);
189 old_ctx = read_c0_entryhi();
190 wired = read_c0_wired() - 1;
191 write_c0_wired(wired);
192 write_c0_index(wired);
193 write_c0_entryhi(UNIQUE_ENTRYHI(wired));
194 write_c0_entrylo0(0);
195 write_c0_entrylo1(0);
199 write_c0_entryhi(old_ctx);
200 EXIT_CRITICAL(flags);
203 preempt_check_resched();
206 void copy_to_user_page(struct vm_area_struct *vma,
207 struct page *page, unsigned long vaddr, void *dst, const void *src,
210 if (cpu_has_dc_aliases) {
211 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
212 memcpy(vto, src, len);
213 kunmap_coherent(page);
215 memcpy(dst, src, len);
216 if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
217 flush_cache_page(vma, vaddr, page_to_pfn(page));
220 EXPORT_SYMBOL(copy_to_user_page);
222 void copy_from_user_page(struct vm_area_struct *vma,
223 struct page *page, unsigned long vaddr, void *dst, const void *src,
226 if (cpu_has_dc_aliases) {
228 kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
229 memcpy(dst, vfrom, len);
230 kunmap_coherent(page);
232 memcpy(dst, src, len);
235 EXPORT_SYMBOL(copy_from_user_page);
238 #ifdef CONFIG_HIGHMEM
242 static void __init kmap_init(void)
244 unsigned long kmap_vstart;
246 /* cache the first kmap pte */
247 kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
248 kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
250 kmap_prot = PAGE_KERNEL;
252 #endif /* CONFIG_HIGHMEM */
254 void __init fixrange_init(unsigned long start, unsigned long end,
257 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
266 i = __pgd_offset(vaddr);
267 j = __pud_offset(vaddr);
268 k = __pmd_offset(vaddr);
271 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
273 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
275 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
276 if (pmd_none(*pmd)) {
277 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
278 set_pmd(pmd, __pmd((unsigned long)pte));
279 if (pte != pte_offset_kernel(pmd, 0))
291 #ifndef CONFIG_NEED_MULTIPLE_NODES
292 extern void pagetable_init(void);
294 static int __init page_is_ram(unsigned long pagenr)
298 for (i = 0; i < boot_mem_map.nr_map; i++) {
299 unsigned long addr, end;
301 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
302 /* not usable memory */
305 addr = PFN_UP(boot_mem_map.map[i].addr);
306 end = PFN_DOWN(boot_mem_map.map[i].addr +
307 boot_mem_map.map[i].size);
309 if (pagenr >= addr && pagenr < end)
316 void __init paging_init(void)
318 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
319 unsigned long max_dma, low;
320 #ifndef CONFIG_FLATMEM
321 unsigned long zholes_size[MAX_NR_ZONES] = { 0, };
322 unsigned long i, j, pfn;
327 #ifdef CONFIG_HIGHMEM
330 kmap_coherent_init();
332 max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
337 zones_size[ZONE_DMA] = low;
339 zones_size[ZONE_DMA] = max_dma;
340 zones_size[ZONE_NORMAL] = low - max_dma;
343 zones_size[ZONE_DMA] = low;
345 #ifdef CONFIG_HIGHMEM
346 zones_size[ZONE_HIGHMEM] = highend_pfn - highstart_pfn;
348 if (cpu_has_dc_aliases && zones_size[ZONE_HIGHMEM]) {
349 printk(KERN_WARNING "This processor doesn't support highmem."
350 " %ldk highmem ignored\n", zones_size[ZONE_HIGHMEM]);
351 zones_size[ZONE_HIGHMEM] = 0;
355 #ifdef CONFIG_FLATMEM
356 free_area_init(zones_size);
359 for (i = 0; i < MAX_NR_ZONES; i++)
360 for (j = 0; j < zones_size[i]; j++, pfn++)
361 if (!page_is_ram(pfn))
363 free_area_init_node(0, NODE_DATA(0), zones_size, 0, zholes_size);
367 static struct kcore_list kcore_mem, kcore_vmalloc;
369 static struct kcore_list kcore_kseg0;
372 void __init mem_init(void)
374 unsigned long codesize, reservedpages, datasize, initsize;
375 unsigned long tmp, ram;
377 #ifdef CONFIG_HIGHMEM
378 #ifdef CONFIG_DISCONTIGMEM
379 #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
381 max_mapnr = highend_pfn;
383 max_mapnr = max_low_pfn;
385 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
387 totalram_pages += free_all_bootmem();
388 totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
390 reservedpages = ram = 0;
391 for (tmp = 0; tmp < max_low_pfn; tmp++)
392 if (page_is_ram(tmp)) {
394 if (PageReserved(pfn_to_page(tmp)))
399 #ifdef CONFIG_HIGHMEM
400 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
401 struct page *page = mem_map + tmp;
403 if (!page_is_ram(tmp)) {
404 SetPageReserved(page);
407 ClearPageReserved(page);
408 #ifdef CONFIG_LIMITED_DMA
409 set_page_address(page, lowmem_page_address(page));
411 init_page_count(page);
415 totalram_pages += totalhigh_pages;
416 num_physpages += totalhigh_pages;
419 codesize = (unsigned long) &_etext - (unsigned long) &_text;
420 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
421 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
424 if ((unsigned long) &_text > (unsigned long) CKSEG0)
425 /* The -4 is a hack so that user tools don't have to handle
427 kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4);
429 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
430 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
431 VMALLOC_END-VMALLOC_START);
433 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
434 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
435 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
436 ram << (PAGE_SHIFT-10),
438 reservedpages << (PAGE_SHIFT-10),
441 (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
443 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
445 static void free_init_pages(char *what, unsigned long begin, unsigned long end)
449 for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
450 struct page *page = pfn_to_page(pfn);
451 void *addr = phys_to_virt(PFN_PHYS(pfn));
453 ClearPageReserved(page);
454 init_page_count(page);
455 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
459 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
462 #ifdef CONFIG_BLK_DEV_INITRD
463 void free_initrd_mem(unsigned long start, unsigned long end)
465 free_init_pages("initrd memory",
466 virt_to_phys((void *)start),
467 virt_to_phys((void *)end));
471 extern unsigned long prom_free_prom_memory(void);
473 void free_initmem(void)
477 freed = prom_free_prom_memory();
479 printk(KERN_INFO "Freeing firmware memory: %ldk freed\n",freed);
481 free_init_pages("unused kernel memory",
482 __pa_symbol(&__init_begin),
483 __pa_symbol(&__init_end));