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Linux/arch/powerpc/mm/mem.c

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  1 /*
  2  *  PowerPC version
  3  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
  4  *
  5  *  Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
  6  *  and Cort Dougan (PReP) (cort@cs.nmt.edu)
  7  *    Copyright (C) 1996 Paul Mackerras
  8  *  PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
  9  *
 10  *  Derived from "arch/i386/mm/init.c"
 11  *    Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
 12  *
 13  *  This program is free software; you can redistribute it and/or
 14  *  modify it under the terms of the GNU General Public License
 15  *  as published by the Free Software Foundation; either version
 16  *  2 of the License, or (at your option) any later version.
 17  *
 18  */
 19 
 20 #include <linux/module.h>
 21 #include <linux/sched.h>
 22 #include <linux/kernel.h>
 23 #include <linux/errno.h>
 24 #include <linux/string.h>
 25 #include <linux/gfp.h>
 26 #include <linux/types.h>
 27 #include <linux/mm.h>
 28 #include <linux/stddef.h>
 29 #include <linux/init.h>
 30 #include <linux/bootmem.h>
 31 #include <linux/highmem.h>
 32 #include <linux/initrd.h>
 33 #include <linux/pagemap.h>
 34 #include <linux/suspend.h>
 35 #include <linux/memblock.h>
 36 #include <linux/hugetlb.h>
 37 
 38 #include <asm/pgalloc.h>
 39 #include <asm/prom.h>
 40 #include <asm/io.h>
 41 #include <asm/mmu_context.h>
 42 #include <asm/pgtable.h>
 43 #include <asm/mmu.h>
 44 #include <asm/smp.h>
 45 #include <asm/machdep.h>
 46 #include <asm/btext.h>
 47 #include <asm/tlb.h>
 48 #include <asm/sections.h>
 49 #include <asm/sparsemem.h>
 50 #include <asm/vdso.h>
 51 #include <asm/fixmap.h>
 52 #include <asm/swiotlb.h>
 53 
 54 #include "mmu_decl.h"
 55 
 56 #ifndef CPU_FTR_COHERENT_ICACHE
 57 #define CPU_FTR_COHERENT_ICACHE 0       /* XXX for now */
 58 #define CPU_FTR_NOEXECUTE       0
 59 #endif
 60 
 61 int init_bootmem_done;
 62 int mem_init_done;
 63 phys_addr_t memory_limit;
 64 
 65 #ifdef CONFIG_HIGHMEM
 66 pte_t *kmap_pte;
 67 pgprot_t kmap_prot;
 68 
 69 EXPORT_SYMBOL(kmap_prot);
 70 EXPORT_SYMBOL(kmap_pte);
 71 
 72 static inline pte_t *virt_to_kpte(unsigned long vaddr)
 73 {
 74         return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
 75                         vaddr), vaddr), vaddr);
 76 }
 77 #endif
 78 
 79 int page_is_ram(unsigned long pfn)
 80 {
 81 #ifndef CONFIG_PPC64    /* XXX for now */
 82         return pfn < max_pfn;
 83 #else
 84         unsigned long paddr = (pfn << PAGE_SHIFT);
 85         struct memblock_region *reg;
 86 
 87         for_each_memblock(memory, reg)
 88                 if (paddr >= reg->base && paddr < (reg->base + reg->size))
 89                         return 1;
 90         return 0;
 91 #endif
 92 }
 93 
 94 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 95                               unsigned long size, pgprot_t vma_prot)
 96 {
 97         if (ppc_md.phys_mem_access_prot)
 98                 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
 99 
100         if (!page_is_ram(pfn))
101                 vma_prot = pgprot_noncached(vma_prot);
102 
103         return vma_prot;
104 }
105 EXPORT_SYMBOL(phys_mem_access_prot);
106 
107 #ifdef CONFIG_MEMORY_HOTPLUG
108 
109 #ifdef CONFIG_NUMA
110 int memory_add_physaddr_to_nid(u64 start)
111 {
112         return hot_add_scn_to_nid(start);
113 }
114 #endif
115 
116 int arch_add_memory(int nid, u64 start, u64 size)
117 {
118         struct pglist_data *pgdata;
119         struct zone *zone;
120         unsigned long start_pfn = start >> PAGE_SHIFT;
121         unsigned long nr_pages = size >> PAGE_SHIFT;
122 
123         pgdata = NODE_DATA(nid);
124 
125         start = (unsigned long)__va(start);
126         if (create_section_mapping(start, start + size))
127                 return -EINVAL;
128 
129         /* this should work for most non-highmem platforms */
130         zone = pgdata->node_zones;
131 
132         return __add_pages(nid, zone, start_pfn, nr_pages);
133 }
134 #endif /* CONFIG_MEMORY_HOTPLUG */
135 
136 /*
137  * walk_memory_resource() needs to make sure there is no holes in a given
138  * memory range.  PPC64 does not maintain the memory layout in /proc/iomem.
139  * Instead it maintains it in memblock.memory structures.  Walk through the
140  * memory regions, find holes and callback for contiguous regions.
141  */
142 int
143 walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
144                 void *arg, int (*func)(unsigned long, unsigned long, void *))
145 {
146         struct memblock_region *reg;
147         unsigned long end_pfn = start_pfn + nr_pages;
148         unsigned long tstart, tend;
149         int ret = -1;
150 
151         for_each_memblock(memory, reg) {
152                 tstart = max(start_pfn, memblock_region_memory_base_pfn(reg));
153                 tend = min(end_pfn, memblock_region_memory_end_pfn(reg));
154                 if (tstart >= tend)
155                         continue;
156                 ret = (*func)(tstart, tend - tstart, arg);
157                 if (ret)
158                         break;
159         }
160         return ret;
161 }
162 EXPORT_SYMBOL_GPL(walk_system_ram_range);
163 
164 /*
165  * Initialize the bootmem system and give it all the memory we
166  * have available.  If we are using highmem, we only put the
167  * lowmem into the bootmem system.
168  */
169 #ifndef CONFIG_NEED_MULTIPLE_NODES
170 void __init do_init_bootmem(void)
171 {
172         unsigned long start, bootmap_pages;
173         unsigned long total_pages;
174         struct memblock_region *reg;
175         int boot_mapsize;
176 
177         max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
178         total_pages = (memblock_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT;
179 #ifdef CONFIG_HIGHMEM
180         total_pages = total_lowmem >> PAGE_SHIFT;
181         max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
182 #endif
183 
184         /*
185          * Find an area to use for the bootmem bitmap.  Calculate the size of
186          * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE.
187          * Add 1 additional page in case the address isn't page-aligned.
188          */
189         bootmap_pages = bootmem_bootmap_pages(total_pages);
190 
191         start = memblock_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
192 
193         min_low_pfn = MEMORY_START >> PAGE_SHIFT;
194         boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn);
195 
196         /* Add active regions with valid PFNs */
197         for_each_memblock(memory, reg) {
198                 unsigned long start_pfn, end_pfn;
199                 start_pfn = memblock_region_memory_base_pfn(reg);
200                 end_pfn = memblock_region_memory_end_pfn(reg);
201                 add_active_range(0, start_pfn, end_pfn);
202         }
203 
204         /* Add all physical memory to the bootmem map, mark each area
205          * present.
206          */
207 #ifdef CONFIG_HIGHMEM
208         free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT);
209 
210         /* reserve the sections we're already using */
211         for_each_memblock(reserved, reg) {
212                 unsigned long top = reg->base + reg->size - 1;
213                 if (top < lowmem_end_addr)
214                         reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
215                 else if (reg->base < lowmem_end_addr) {
216                         unsigned long trunc_size = lowmem_end_addr - reg->base;
217                         reserve_bootmem(reg->base, trunc_size, BOOTMEM_DEFAULT);
218                 }
219         }
220 #else
221         free_bootmem_with_active_regions(0, max_pfn);
222 
223         /* reserve the sections we're already using */
224         for_each_memblock(reserved, reg)
225                 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
226 #endif
227         /* XXX need to clip this if using highmem? */
228         sparse_memory_present_with_active_regions(0);
229 
230         init_bootmem_done = 1;
231 }
232 
233 /* mark pages that don't exist as nosave */
234 static int __init mark_nonram_nosave(void)
235 {
236         struct memblock_region *reg, *prev = NULL;
237 
238         for_each_memblock(memory, reg) {
239                 if (prev &&
240                     memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg))
241                         register_nosave_region(memblock_region_memory_end_pfn(prev),
242                                                memblock_region_memory_base_pfn(reg));
243                 prev = reg;
244         }
245         return 0;
246 }
247 
248 /*
249  * paging_init() sets up the page tables - in fact we've already done this.
250  */
251 void __init paging_init(void)
252 {
253         unsigned long total_ram = memblock_phys_mem_size();
254         phys_addr_t top_of_ram = memblock_end_of_DRAM();
255         unsigned long max_zone_pfns[MAX_NR_ZONES];
256 
257 #ifdef CONFIG_PPC32
258         unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1);
259         unsigned long end = __fix_to_virt(FIX_HOLE);
260 
261         for (; v < end; v += PAGE_SIZE)
262                 map_page(v, 0, 0); /* XXX gross */
263 #endif
264 
265 #ifdef CONFIG_HIGHMEM
266         map_page(PKMAP_BASE, 0, 0);     /* XXX gross */
267         pkmap_page_table = virt_to_kpte(PKMAP_BASE);
268 
269         kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
270         kmap_prot = PAGE_KERNEL;
271 #endif /* CONFIG_HIGHMEM */
272 
273         printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%lx\n",
274                (unsigned long long)top_of_ram, total_ram);
275         printk(KERN_DEBUG "Memory hole size: %ldMB\n",
276                (long int)((top_of_ram - total_ram) >> 20));
277         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
278 #ifdef CONFIG_HIGHMEM
279         max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT;
280         max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT;
281 #else
282         max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
283 #endif
284         free_area_init_nodes(max_zone_pfns);
285 
286         mark_nonram_nosave();
287 }
288 #endif /* ! CONFIG_NEED_MULTIPLE_NODES */
289 
290 void __init mem_init(void)
291 {
292 #ifdef CONFIG_NEED_MULTIPLE_NODES
293         int nid;
294 #endif
295         pg_data_t *pgdat;
296         unsigned long i;
297         struct page *page;
298         unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
299 
300 #ifdef CONFIG_SWIOTLB
301         if (ppc_swiotlb_enable)
302                 swiotlb_init(1);
303 #endif
304 
305         num_physpages = memblock_phys_mem_size() >> PAGE_SHIFT;
306         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
307 
308 #ifdef CONFIG_NEED_MULTIPLE_NODES
309         for_each_online_node(nid) {
310                 if (NODE_DATA(nid)->node_spanned_pages != 0) {
311                         printk("freeing bootmem node %d\n", nid);
312                         totalram_pages +=
313                                 free_all_bootmem_node(NODE_DATA(nid));
314                 }
315         }
316 #else
317         max_mapnr = max_pfn;
318         totalram_pages += free_all_bootmem();
319 #endif
320         for_each_online_pgdat(pgdat) {
321                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
322                         if (!pfn_valid(pgdat->node_start_pfn + i))
323                                 continue;
324                         page = pgdat_page_nr(pgdat, i);
325                         if (PageReserved(page))
326                                 reservedpages++;
327                 }
328         }
329 
330         codesize = (unsigned long)&_sdata - (unsigned long)&_stext;
331         datasize = (unsigned long)&_edata - (unsigned long)&_sdata;
332         initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
333         bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start;
334 
335 #ifdef CONFIG_HIGHMEM
336         {
337                 unsigned long pfn, highmem_mapnr;
338 
339                 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
340                 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
341                         struct page *page = pfn_to_page(pfn);
342                         if (memblock_is_reserved(pfn << PAGE_SHIFT))
343                                 continue;
344                         ClearPageReserved(page);
345                         init_page_count(page);
346                         __free_page(page);
347                         totalhigh_pages++;
348                         reservedpages--;
349                 }
350                 totalram_pages += totalhigh_pages;
351                 printk(KERN_DEBUG "High memory: %luk\n",
352                        totalhigh_pages << (PAGE_SHIFT-10));
353         }
354 #endif /* CONFIG_HIGHMEM */
355 
356         printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, "
357                "%luk reserved, %luk data, %luk bss, %luk init)\n",
358                 nr_free_pages() << (PAGE_SHIFT-10),
359                 num_physpages << (PAGE_SHIFT-10),
360                 codesize >> 10,
361                 reservedpages << (PAGE_SHIFT-10),
362                 datasize >> 10,
363                 bsssize >> 10,
364                 initsize >> 10);
365 
366 #ifdef CONFIG_PPC32
367         pr_info("Kernel virtual memory layout:\n");
368         pr_info("  * 0x%08lx..0x%08lx  : fixmap\n", FIXADDR_START, FIXADDR_TOP);
369 #ifdef CONFIG_HIGHMEM
370         pr_info("  * 0x%08lx..0x%08lx  : highmem PTEs\n",
371                 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
372 #endif /* CONFIG_HIGHMEM */
373 #ifdef CONFIG_NOT_COHERENT_CACHE
374         pr_info("  * 0x%08lx..0x%08lx  : consistent mem\n",
375                 IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE);
376 #endif /* CONFIG_NOT_COHERENT_CACHE */
377         pr_info("  * 0x%08lx..0x%08lx  : early ioremap\n",
378                 ioremap_bot, IOREMAP_TOP);
379         pr_info("  * 0x%08lx..0x%08lx  : vmalloc & ioremap\n",
380                 VMALLOC_START, VMALLOC_END);
381 #endif /* CONFIG_PPC32 */
382 
383         mem_init_done = 1;
384 }
385 
386 #ifdef CONFIG_BLK_DEV_INITRD
387 void __init free_initrd_mem(unsigned long start, unsigned long end)
388 {
389         if (start >= end)
390                 return;
391 
392         start = _ALIGN_DOWN(start, PAGE_SIZE);
393         end = _ALIGN_UP(end, PAGE_SIZE);
394         pr_info("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
395 
396         for (; start < end; start += PAGE_SIZE) {
397                 ClearPageReserved(virt_to_page(start));
398                 init_page_count(virt_to_page(start));
399                 free_page(start);
400                 totalram_pages++;
401         }
402 }
403 #endif
404 
405 /*
406  * This is called when a page has been modified by the kernel.
407  * It just marks the page as not i-cache clean.  We do the i-cache
408  * flush later when the page is given to a user process, if necessary.
409  */
410 void flush_dcache_page(struct page *page)
411 {
412         if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
413                 return;
414         /* avoid an atomic op if possible */
415         if (test_bit(PG_arch_1, &page->flags))
416                 clear_bit(PG_arch_1, &page->flags);
417 }
418 EXPORT_SYMBOL(flush_dcache_page);
419 
420 void flush_dcache_icache_page(struct page *page)
421 {
422 #ifdef CONFIG_HUGETLB_PAGE
423         if (PageCompound(page)) {
424                 flush_dcache_icache_hugepage(page);
425                 return;
426         }
427 #endif
428 #ifdef CONFIG_BOOKE
429         {
430                 void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE);
431                 __flush_dcache_icache(start);
432                 kunmap_atomic(start, KM_PPC_SYNC_ICACHE);
433         }
434 #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64)
435         /* On 8xx there is no need to kmap since highmem is not supported */
436         __flush_dcache_icache(page_address(page)); 
437 #else
438         __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
439 #endif
440 }
441 
442 void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
443 {
444         clear_page(page);
445 
446         /*
447          * We shouldn't have to do this, but some versions of glibc
448          * require it (ld.so assumes zero filled pages are icache clean)
449          * - Anton
450          */
451         flush_dcache_page(pg);
452 }
453 EXPORT_SYMBOL(clear_user_page);
454 
455 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
456                     struct page *pg)
457 {
458         copy_page(vto, vfrom);
459 
460         /*
461          * We should be able to use the following optimisation, however
462          * there are two problems.
463          * Firstly a bug in some versions of binutils meant PLT sections
464          * were not marked executable.
465          * Secondly the first word in the GOT section is blrl, used
466          * to establish the GOT address. Until recently the GOT was
467          * not marked executable.
468          * - Anton
469          */
470 #if 0
471         if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
472                 return;
473 #endif
474 
475         flush_dcache_page(pg);
476 }
477 
478 void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
479                              unsigned long addr, int len)
480 {
481         unsigned long maddr;
482 
483         maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
484         flush_icache_range(maddr, maddr + len);
485         kunmap(page);
486 }
487 EXPORT_SYMBOL(flush_icache_user_range);
488 
489 /*
490  * This is called at the end of handling a user page fault, when the
491  * fault has been handled by updating a PTE in the linux page tables.
492  * We use it to preload an HPTE into the hash table corresponding to
493  * the updated linux PTE.
494  * 
495  * This must always be called with the pte lock held.
496  */
497 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
498                       pte_t *ptep)
499 {
500 #ifdef CONFIG_PPC_STD_MMU
501         unsigned long access = 0, trap;
502 
503         /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
504         if (!pte_young(*ptep) || address >= TASK_SIZE)
505                 return;
506 
507         /* We try to figure out if we are coming from an instruction
508          * access fault and pass that down to __hash_page so we avoid
509          * double-faulting on execution of fresh text. We have to test
510          * for regs NULL since init will get here first thing at boot
511          *
512          * We also avoid filling the hash if not coming from a fault
513          */
514         if (current->thread.regs == NULL)
515                 return;
516         trap = TRAP(current->thread.regs);
517         if (trap == 0x400)
518                 access |= _PAGE_EXEC;
519         else if (trap != 0x300)
520                 return;
521         hash_preload(vma->vm_mm, address, access, trap);
522 #endif /* CONFIG_PPC_STD_MMU */
523 }
524 

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