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Linux/arch/mips/mm/init.c

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  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.
  5  *
  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.
 10  */
 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>
 32 #include <linux/kcore.h>
 33 
 34 #include <asm/asm-offsets.h>
 35 #include <asm/bootinfo.h>
 36 #include <asm/cachectl.h>
 37 #include <asm/cpu.h>
 38 #include <asm/dma.h>
 39 #include <asm/kmap_types.h>
 40 #include <asm/mmu_context.h>
 41 #include <asm/sections.h>
 42 #include <asm/pgtable.h>
 43 #include <asm/pgalloc.h>
 44 #include <asm/tlb.h>
 45 #include <asm/fixmap.h>
 46 
 47 /*
 48  * We have up to 8 empty zeroed pages so we can map one of the right colour
 49  * when needed.  This is necessary only on R4000 / R4400 SC and MC versions
 50  * where we have to avoid VCED / VECI exceptions for good performance at
 51  * any price.  Since page is never written to after the initialization we
 52  * don't have to care about aliases on other CPUs.
 53  */
 54 unsigned long empty_zero_page, zero_page_mask;
 55 EXPORT_SYMBOL_GPL(empty_zero_page);
 56 EXPORT_SYMBOL(zero_page_mask);
 57 
 58 /*
 59  * Not static inline because used by IP27 special magic initialization code
 60  */
 61 void setup_zero_pages(void)
 62 {
 63         unsigned int order, i;
 64         struct page *page;
 65 
 66         if (cpu_has_vce)
 67                 order = 3;
 68         else
 69                 order = 0;
 70 
 71         empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
 72         if (!empty_zero_page)
 73                 panic("Oh boy, that early out of memory?");
 74 
 75         page = virt_to_page((void *)empty_zero_page);
 76         split_page(page, order);
 77         for (i = 0; i < (1 << order); i++, page++)
 78                 mark_page_reserved(page);
 79 
 80         zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
 81 }
 82 
 83 static void *__kmap_pgprot(struct page *page, unsigned long addr, pgprot_t prot)
 84 {
 85         enum fixed_addresses idx;
 86         unsigned long vaddr, flags, entrylo;
 87         unsigned long old_ctx;
 88         pte_t pte;
 89         int tlbidx;
 90 
 91         BUG_ON(Page_dcache_dirty(page));
 92 
 93         preempt_disable();
 94         pagefault_disable();
 95         idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
 96         idx += in_interrupt() ? FIX_N_COLOURS : 0;
 97         vaddr = __fix_to_virt(FIX_CMAP_END - idx);
 98         pte = mk_pte(page, prot);
 99 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
100         entrylo = pte_to_entrylo(pte.pte_high);
101 #else
102         entrylo = pte_to_entrylo(pte_val(pte));
103 #endif
104 
105         local_irq_save(flags);
106         old_ctx = read_c0_entryhi();
107         write_c0_entryhi(vaddr & (PAGE_MASK << 1));
108         write_c0_entrylo0(entrylo);
109         write_c0_entrylo1(entrylo);
110 #ifdef CONFIG_XPA
111         entrylo = (pte.pte_low & _PFNX_MASK);
112         writex_c0_entrylo0(entrylo);
113         writex_c0_entrylo1(entrylo);
114 #endif
115         tlbidx = read_c0_wired();
116         write_c0_wired(tlbidx + 1);
117         write_c0_index(tlbidx);
118         mtc0_tlbw_hazard();
119         tlb_write_indexed();
120         tlbw_use_hazard();
121         write_c0_entryhi(old_ctx);
122         local_irq_restore(flags);
123 
124         return (void*) vaddr;
125 }
126 
127 void *kmap_coherent(struct page *page, unsigned long addr)
128 {
129         return __kmap_pgprot(page, addr, PAGE_KERNEL);
130 }
131 
132 void *kmap_noncoherent(struct page *page, unsigned long addr)
133 {
134         return __kmap_pgprot(page, addr, PAGE_KERNEL_NC);
135 }
136 
137 void kunmap_coherent(void)
138 {
139         unsigned int wired;
140         unsigned long flags, old_ctx;
141 
142         local_irq_save(flags);
143         old_ctx = read_c0_entryhi();
144         wired = read_c0_wired() - 1;
145         write_c0_wired(wired);
146         write_c0_index(wired);
147         write_c0_entryhi(UNIQUE_ENTRYHI(wired));
148         write_c0_entrylo0(0);
149         write_c0_entrylo1(0);
150         mtc0_tlbw_hazard();
151         tlb_write_indexed();
152         tlbw_use_hazard();
153         write_c0_entryhi(old_ctx);
154         local_irq_restore(flags);
155         pagefault_enable();
156         preempt_enable();
157 }
158 
159 void copy_user_highpage(struct page *to, struct page *from,
160         unsigned long vaddr, struct vm_area_struct *vma)
161 {
162         void *vfrom, *vto;
163 
164         vto = kmap_atomic(to);
165         if (cpu_has_dc_aliases &&
166             page_mapped(from) && !Page_dcache_dirty(from)) {
167                 vfrom = kmap_coherent(from, vaddr);
168                 copy_page(vto, vfrom);
169                 kunmap_coherent();
170         } else {
171                 vfrom = kmap_atomic(from);
172                 copy_page(vto, vfrom);
173                 kunmap_atomic(vfrom);
174         }
175         if ((!cpu_has_ic_fills_f_dc) ||
176             pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
177                 flush_data_cache_page((unsigned long)vto);
178         kunmap_atomic(vto);
179         /* Make sure this page is cleared on other CPU's too before using it */
180         smp_wmb();
181 }
182 
183 void copy_to_user_page(struct vm_area_struct *vma,
184         struct page *page, unsigned long vaddr, void *dst, const void *src,
185         unsigned long len)
186 {
187         if (cpu_has_dc_aliases &&
188             page_mapped(page) && !Page_dcache_dirty(page)) {
189                 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
190                 memcpy(vto, src, len);
191                 kunmap_coherent();
192         } else {
193                 memcpy(dst, src, len);
194                 if (cpu_has_dc_aliases)
195                         SetPageDcacheDirty(page);
196         }
197         if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
198                 flush_cache_page(vma, vaddr, page_to_pfn(page));
199 }
200 
201 void copy_from_user_page(struct vm_area_struct *vma,
202         struct page *page, unsigned long vaddr, void *dst, const void *src,
203         unsigned long len)
204 {
205         if (cpu_has_dc_aliases &&
206             page_mapped(page) && !Page_dcache_dirty(page)) {
207                 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
208                 memcpy(dst, vfrom, len);
209                 kunmap_coherent();
210         } else {
211                 memcpy(dst, src, len);
212                 if (cpu_has_dc_aliases)
213                         SetPageDcacheDirty(page);
214         }
215 }
216 EXPORT_SYMBOL_GPL(copy_from_user_page);
217 
218 void __init fixrange_init(unsigned long start, unsigned long end,
219         pgd_t *pgd_base)
220 {
221 #ifdef CONFIG_HIGHMEM
222         pgd_t *pgd;
223         pud_t *pud;
224         pmd_t *pmd;
225         pte_t *pte;
226         int i, j, k;
227         unsigned long vaddr;
228 
229         vaddr = start;
230         i = __pgd_offset(vaddr);
231         j = __pud_offset(vaddr);
232         k = __pmd_offset(vaddr);
233         pgd = pgd_base + i;
234 
235         for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
236                 pud = (pud_t *)pgd;
237                 for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) {
238                         pmd = (pmd_t *)pud;
239                         for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) {
240                                 if (pmd_none(*pmd)) {
241                                         pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
242                                         set_pmd(pmd, __pmd((unsigned long)pte));
243                                         BUG_ON(pte != pte_offset_kernel(pmd, 0));
244                                 }
245                                 vaddr += PMD_SIZE;
246                         }
247                         k = 0;
248                 }
249                 j = 0;
250         }
251 #endif
252 }
253 
254 #ifndef CONFIG_NEED_MULTIPLE_NODES
255 int page_is_ram(unsigned long pagenr)
256 {
257         int i;
258 
259         for (i = 0; i < boot_mem_map.nr_map; i++) {
260                 unsigned long addr, end;
261 
262                 switch (boot_mem_map.map[i].type) {
263                 case BOOT_MEM_RAM:
264                 case BOOT_MEM_INIT_RAM:
265                         break;
266                 default:
267                         /* not usable memory */
268                         continue;
269                 }
270 
271                 addr = PFN_UP(boot_mem_map.map[i].addr);
272                 end = PFN_DOWN(boot_mem_map.map[i].addr +
273                                boot_mem_map.map[i].size);
274 
275                 if (pagenr >= addr && pagenr < end)
276                         return 1;
277         }
278 
279         return 0;
280 }
281 
282 void __init paging_init(void)
283 {
284         unsigned long max_zone_pfns[MAX_NR_ZONES];
285         unsigned long lastpfn __maybe_unused;
286 
287         pagetable_init();
288 
289 #ifdef CONFIG_HIGHMEM
290         kmap_init();
291 #endif
292 #ifdef CONFIG_ZONE_DMA
293         max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
294 #endif
295 #ifdef CONFIG_ZONE_DMA32
296         max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
297 #endif
298         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
299         lastpfn = max_low_pfn;
300 #ifdef CONFIG_HIGHMEM
301         max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
302         lastpfn = highend_pfn;
303 
304         if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
305                 printk(KERN_WARNING "This processor doesn't support highmem."
306                        " %ldk highmem ignored\n",
307                        (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
308                 max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
309                 lastpfn = max_low_pfn;
310         }
311 #endif
312 
313         free_area_init_nodes(max_zone_pfns);
314 }
315 
316 #ifdef CONFIG_64BIT
317 static struct kcore_list kcore_kseg0;
318 #endif
319 
320 static inline void mem_init_free_highmem(void)
321 {
322 #ifdef CONFIG_HIGHMEM
323         unsigned long tmp;
324 
325         for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
326                 struct page *page = pfn_to_page(tmp);
327 
328                 if (!page_is_ram(tmp))
329                         SetPageReserved(page);
330                 else
331                         free_highmem_page(page);
332         }
333 #endif
334 }
335 
336 unsigned __weak platform_maar_init(unsigned num_maars)
337 {
338         return 0;
339 }
340 
341 static void maar_init(void)
342 {
343         unsigned num_maars, used, i;
344 
345         if (!cpu_has_maar)
346                 return;
347 
348         /* Detect the number of MAARs */
349         write_c0_maari(~0);
350         back_to_back_c0_hazard();
351         num_maars = read_c0_maari() + 1;
352 
353         /* MAARs should be in pairs */
354         WARN_ON(num_maars % 2);
355 
356         /* Configure the required MAARs */
357         used = platform_maar_init(num_maars / 2);
358 
359         /* Disable any further MAARs */
360         for (i = (used * 2); i < num_maars; i++) {
361                 write_c0_maari(i);
362                 back_to_back_c0_hazard();
363                 write_c0_maar(0);
364                 back_to_back_c0_hazard();
365         }
366 }
367 
368 void __init mem_init(void)
369 {
370 #ifdef CONFIG_HIGHMEM
371 #ifdef CONFIG_DISCONTIGMEM
372 #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
373 #endif
374         max_mapnr = highend_pfn ? highend_pfn : max_low_pfn;
375 #else
376         max_mapnr = max_low_pfn;
377 #endif
378         high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
379 
380         maar_init();
381         free_all_bootmem();
382         setup_zero_pages();     /* Setup zeroed pages.  */
383         mem_init_free_highmem();
384         mem_init_print_info(NULL);
385 
386 #ifdef CONFIG_64BIT
387         if ((unsigned long) &_text > (unsigned long) CKSEG0)
388                 /* The -4 is a hack so that user tools don't have to handle
389                    the overflow.  */
390                 kclist_add(&kcore_kseg0, (void *) CKSEG0,
391                                 0x80000000 - 4, KCORE_TEXT);
392 #endif
393 }
394 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
395 
396 void free_init_pages(const char *what, unsigned long begin, unsigned long end)
397 {
398         unsigned long pfn;
399 
400         for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
401                 struct page *page = pfn_to_page(pfn);
402                 void *addr = phys_to_virt(PFN_PHYS(pfn));
403 
404                 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
405                 free_reserved_page(page);
406         }
407         printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
408 }
409 
410 #ifdef CONFIG_BLK_DEV_INITRD
411 void free_initrd_mem(unsigned long start, unsigned long end)
412 {
413         free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
414                            "initrd");
415 }
416 #endif
417 
418 void (*free_init_pages_eva)(void *begin, void *end) = NULL;
419 
420 void __init_refok free_initmem(void)
421 {
422         prom_free_prom_memory();
423         /*
424          * Let the platform define a specific function to free the
425          * init section since EVA may have used any possible mapping
426          * between virtual and physical addresses.
427          */
428         if (free_init_pages_eva)
429                 free_init_pages_eva((void *)&__init_begin, (void *)&__init_end);
430         else
431                 free_initmem_default(POISON_FREE_INITMEM);
432 }
433 
434 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
435 unsigned long pgd_current[NR_CPUS];
436 #endif
437 
438 /*
439  * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
440  * are constants.  So we use the variants from asm-offset.h until that gcc
441  * will officially be retired.
442  *
443  * Align swapper_pg_dir in to 64K, allows its address to be loaded
444  * with a single LUI instruction in the TLB handlers.  If we used
445  * __aligned(64K), its size would get rounded up to the alignment
446  * size, and waste space.  So we place it in its own section and align
447  * it in the linker script.
448  */
449 pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
450 #ifndef __PAGETABLE_PMD_FOLDED
451 pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
452 #endif
453 pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
454 

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