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/export.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>
32 #include <linux/kcore.h>
33 #include <linux/export.h>
35 #include <asm/asm-offsets.h>
36 #include <asm/bootinfo.h>
37 #include <asm/cachectl.h>
40 #include <asm/kmap_types.h>
42 #include <asm/mmu_context.h>
43 #include <asm/sections.h>
44 #include <asm/pgtable.h>
45 #include <asm/pgalloc.h>
47 #include <asm/fixmap.h>
51 * We have up to 8 empty zeroed pages so we can map one of the right colour
52 * when needed. This is necessary only on R4000 / R4400 SC and MC versions
53 * where we have to avoid VCED / VECI exceptions for good performance at
54 * any price. Since page is never written to after the initialization we
55 * don't have to care about aliases on other CPUs.
57 unsigned long empty_zero_page, zero_page_mask;
58 EXPORT_SYMBOL_GPL(empty_zero_page);
59 EXPORT_SYMBOL(zero_page_mask);
62 * Not static inline because used by IP27 special magic initialization code
64 void setup_zero_pages(void)
66 unsigned int order, i;
74 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
76 panic("Oh boy, that early out of memory?");
78 page = virt_to_page((void *)empty_zero_page);
79 split_page(page, order);
80 for (i = 0; i < (1 << order); i++, page++)
81 mark_page_reserved(page);
83 zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
86 static void *__kmap_pgprot(struct page *page, unsigned long addr, pgprot_t prot)
88 enum fixed_addresses idx;
89 unsigned long vaddr, flags, entrylo;
90 unsigned long old_ctx;
94 BUG_ON(Page_dcache_dirty(page));
98 idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
99 idx += in_interrupt() ? FIX_N_COLOURS : 0;
100 vaddr = __fix_to_virt(FIX_CMAP_END - idx);
101 pte = mk_pte(page, prot);
102 #if defined(CONFIG_XPA)
103 entrylo = pte_to_entrylo(pte.pte_high);
104 #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
105 entrylo = pte.pte_high;
107 entrylo = pte_to_entrylo(pte_val(pte));
110 local_irq_save(flags);
111 old_ctx = read_c0_entryhi();
112 write_c0_entryhi(vaddr & (PAGE_MASK << 1));
113 write_c0_entrylo0(entrylo);
114 write_c0_entrylo1(entrylo);
117 entrylo = (pte.pte_low & _PFNX_MASK);
118 writex_c0_entrylo0(entrylo);
119 writex_c0_entrylo1(entrylo);
122 tlbidx = num_wired_entries();
123 write_c0_wired(tlbidx + 1);
124 write_c0_index(tlbidx);
128 write_c0_entryhi(old_ctx);
129 local_irq_restore(flags);
131 return (void*) vaddr;
134 void *kmap_coherent(struct page *page, unsigned long addr)
136 return __kmap_pgprot(page, addr, PAGE_KERNEL);
139 void *kmap_noncoherent(struct page *page, unsigned long addr)
141 return __kmap_pgprot(page, addr, PAGE_KERNEL_NC);
144 void kunmap_coherent(void)
147 unsigned long flags, old_ctx;
149 local_irq_save(flags);
150 old_ctx = read_c0_entryhi();
151 wired = num_wired_entries() - 1;
152 write_c0_wired(wired);
153 write_c0_index(wired);
154 write_c0_entryhi(UNIQUE_ENTRYHI(wired));
155 write_c0_entrylo0(0);
156 write_c0_entrylo1(0);
160 write_c0_entryhi(old_ctx);
161 local_irq_restore(flags);
166 void copy_user_highpage(struct page *to, struct page *from,
167 unsigned long vaddr, struct vm_area_struct *vma)
171 vto = kmap_atomic(to);
172 if (cpu_has_dc_aliases &&
173 page_mapcount(from) && !Page_dcache_dirty(from)) {
174 vfrom = kmap_coherent(from, vaddr);
175 copy_page(vto, vfrom);
178 vfrom = kmap_atomic(from);
179 copy_page(vto, vfrom);
180 kunmap_atomic(vfrom);
182 if ((!cpu_has_ic_fills_f_dc) ||
183 pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
184 flush_data_cache_page((unsigned long)vto);
186 /* Make sure this page is cleared on other CPU's too before using it */
190 void copy_to_user_page(struct vm_area_struct *vma,
191 struct page *page, unsigned long vaddr, void *dst, const void *src,
194 if (cpu_has_dc_aliases &&
195 page_mapcount(page) && !Page_dcache_dirty(page)) {
196 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
197 memcpy(vto, src, len);
200 memcpy(dst, src, len);
201 if (cpu_has_dc_aliases)
202 SetPageDcacheDirty(page);
204 if (vma->vm_flags & VM_EXEC)
205 flush_cache_page(vma, vaddr, page_to_pfn(page));
208 void copy_from_user_page(struct vm_area_struct *vma,
209 struct page *page, unsigned long vaddr, void *dst, const void *src,
212 if (cpu_has_dc_aliases &&
213 page_mapcount(page) && !Page_dcache_dirty(page)) {
214 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
215 memcpy(dst, vfrom, len);
218 memcpy(dst, src, len);
219 if (cpu_has_dc_aliases)
220 SetPageDcacheDirty(page);
223 EXPORT_SYMBOL_GPL(copy_from_user_page);
225 void __init fixrange_init(unsigned long start, unsigned long end,
228 #ifdef CONFIG_HIGHMEM
237 i = __pgd_offset(vaddr);
238 j = __pud_offset(vaddr);
239 k = __pmd_offset(vaddr);
242 for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
244 for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) {
246 for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) {
247 if (pmd_none(*pmd)) {
248 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
249 set_pmd(pmd, __pmd((unsigned long)pte));
250 BUG_ON(pte != pte_offset_kernel(pmd, 0));
261 unsigned __weak platform_maar_init(unsigned num_pairs)
263 struct maar_config cfg[BOOT_MEM_MAP_MAX];
264 unsigned i, num_configured, num_cfg = 0;
266 for (i = 0; i < boot_mem_map.nr_map; i++) {
267 switch (boot_mem_map.map[i].type) {
269 case BOOT_MEM_INIT_RAM:
276 cfg[num_cfg].lower = boot_mem_map.map[i].addr;
277 cfg[num_cfg].lower = (cfg[num_cfg].lower + 0xffff) & ~0xffff;
279 /* Round upper down */
280 cfg[num_cfg].upper = boot_mem_map.map[i].addr +
281 boot_mem_map.map[i].size;
282 cfg[num_cfg].upper = (cfg[num_cfg].upper & ~0xffff) - 1;
284 cfg[num_cfg].attrs = MIPS_MAAR_S;
288 num_configured = maar_config(cfg, num_cfg, num_pairs);
289 if (num_configured < num_cfg)
290 pr_warn("Not enough MAAR pairs (%u) for all bootmem regions (%u)\n",
293 return num_configured;
298 unsigned num_maars, used, i;
299 phys_addr_t lower, upper, attr;
301 struct maar_config cfgs[3];
303 } recorded = { { { 0 } }, 0 };
308 /* Detect the number of MAARs */
310 back_to_back_c0_hazard();
311 num_maars = read_c0_maari() + 1;
313 /* MAARs should be in pairs */
314 WARN_ON(num_maars % 2);
316 /* Set MAARs using values we recorded already */
318 used = maar_config(recorded.cfgs, recorded.used, num_maars / 2);
319 BUG_ON(used != recorded.used);
321 /* Configure the required MAARs */
322 used = platform_maar_init(num_maars / 2);
325 /* Disable any further MAARs */
326 for (i = (used * 2); i < num_maars; i++) {
328 back_to_back_c0_hazard();
330 back_to_back_c0_hazard();
336 pr_info("MAAR configuration:\n");
337 for (i = 0; i < num_maars; i += 2) {
339 back_to_back_c0_hazard();
340 upper = read_c0_maar();
342 write_c0_maari(i + 1);
343 back_to_back_c0_hazard();
344 lower = read_c0_maar();
346 attr = lower & upper;
347 lower = (lower & MIPS_MAAR_ADDR) << 4;
348 upper = ((upper & MIPS_MAAR_ADDR) << 4) | 0xffff;
350 pr_info(" [%d]: ", i / 2);
351 if (!(attr & MIPS_MAAR_V)) {
352 pr_cont("disabled\n");
356 pr_cont("%pa-%pa", &lower, &upper);
358 if (attr & MIPS_MAAR_S)
359 pr_cont(" speculate");
363 /* Record the setup for use on secondary CPUs */
364 if (used <= ARRAY_SIZE(recorded.cfgs)) {
365 recorded.cfgs[recorded.used].lower = lower;
366 recorded.cfgs[recorded.used].upper = upper;
367 recorded.cfgs[recorded.used].attrs = attr;
373 #ifndef CONFIG_NEED_MULTIPLE_NODES
374 int page_is_ram(unsigned long pagenr)
378 for (i = 0; i < boot_mem_map.nr_map; i++) {
379 unsigned long addr, end;
381 switch (boot_mem_map.map[i].type) {
383 case BOOT_MEM_INIT_RAM:
386 /* not usable memory */
390 addr = PFN_UP(boot_mem_map.map[i].addr);
391 end = PFN_DOWN(boot_mem_map.map[i].addr +
392 boot_mem_map.map[i].size);
394 if (pagenr >= addr && pagenr < end)
401 void __init paging_init(void)
403 unsigned long max_zone_pfns[MAX_NR_ZONES];
404 unsigned long lastpfn __maybe_unused;
408 #ifdef CONFIG_HIGHMEM
411 #ifdef CONFIG_ZONE_DMA
412 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
414 #ifdef CONFIG_ZONE_DMA32
415 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
417 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
418 lastpfn = max_low_pfn;
419 #ifdef CONFIG_HIGHMEM
420 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
421 lastpfn = highend_pfn;
423 if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
424 printk(KERN_WARNING "This processor doesn't support highmem."
425 " %ldk highmem ignored\n",
426 (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
427 max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
428 lastpfn = max_low_pfn;
432 free_area_init_nodes(max_zone_pfns);
436 static struct kcore_list kcore_kseg0;
439 static inline void mem_init_free_highmem(void)
441 #ifdef CONFIG_HIGHMEM
444 if (cpu_has_dc_aliases)
447 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
448 struct page *page = pfn_to_page(tmp);
450 if (!page_is_ram(tmp))
451 SetPageReserved(page);
453 free_highmem_page(page);
458 void __init mem_init(void)
460 #ifdef CONFIG_HIGHMEM
461 #ifdef CONFIG_DISCONTIGMEM
462 #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
464 max_mapnr = highend_pfn ? highend_pfn : max_low_pfn;
466 max_mapnr = max_low_pfn;
468 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
472 setup_zero_pages(); /* Setup zeroed pages. */
473 mem_init_free_highmem();
474 mem_init_print_info(NULL);
477 if ((unsigned long) &_text > (unsigned long) CKSEG0)
478 /* The -4 is a hack so that user tools don't have to handle
480 kclist_add(&kcore_kseg0, (void *) CKSEG0,
481 0x80000000 - 4, KCORE_TEXT);
484 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
486 void free_init_pages(const char *what, unsigned long begin, unsigned long end)
490 for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
491 struct page *page = pfn_to_page(pfn);
492 void *addr = phys_to_virt(PFN_PHYS(pfn));
494 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
495 free_reserved_page(page);
497 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
500 #ifdef CONFIG_BLK_DEV_INITRD
501 void free_initrd_mem(unsigned long start, unsigned long end)
503 free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
508 void (*free_init_pages_eva)(void *begin, void *end) = NULL;
510 void __ref free_initmem(void)
512 prom_free_prom_memory();
514 * Let the platform define a specific function to free the
515 * init section since EVA may have used any possible mapping
516 * between virtual and physical addresses.
518 if (free_init_pages_eva)
519 free_init_pages_eva((void *)&__init_begin, (void *)&__init_end);
521 free_initmem_default(POISON_FREE_INITMEM);
524 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
525 unsigned long pgd_current[NR_CPUS];
529 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
530 * are constants. So we use the variants from asm-offset.h until that gcc
531 * will officially be retired.
533 * Align swapper_pg_dir in to 64K, allows its address to be loaded
534 * with a single LUI instruction in the TLB handlers. If we used
535 * __aligned(64K), its size would get rounded up to the alignment
536 * size, and waste space. So we place it in its own section and align
537 * it in the linker script.
539 pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
540 #ifndef __PAGETABLE_PMD_FOLDED
541 pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
543 pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
544 EXPORT_SYMBOL(invalid_pte_table);