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20#include <linux/export.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#include <linux/slab.h>
38
39#include <asm/pgalloc.h>
40#include <asm/prom.h>
41#include <asm/io.h>
42#include <asm/mmu_context.h>
43#include <asm/pgtable.h>
44#include <asm/mmu.h>
45#include <asm/smp.h>
46#include <asm/machdep.h>
47#include <asm/btext.h>
48#include <asm/tlb.h>
49#include <asm/sections.h>
50#include <asm/sparsemem.h>
51#include <asm/vdso.h>
52#include <asm/fixmap.h>
53#include <asm/swiotlb.h>
54#include <asm/rtas.h>
55
56#include "mmu_decl.h"
57
58#ifndef CPU_FTR_COHERENT_ICACHE
59#define CPU_FTR_COHERENT_ICACHE 0
60#define CPU_FTR_NOEXECUTE 0
61#endif
62
63int init_bootmem_done;
64int mem_init_done;
65unsigned long long memory_limit;
66
67#ifdef CONFIG_HIGHMEM
68pte_t *kmap_pte;
69EXPORT_SYMBOL(kmap_pte);
70pgprot_t kmap_prot;
71EXPORT_SYMBOL(kmap_prot);
72
73static inline pte_t *virt_to_kpte(unsigned long vaddr)
74{
75 return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
76 vaddr), vaddr), vaddr);
77}
78#endif
79
80int page_is_ram(unsigned long pfn)
81{
82#ifndef CONFIG_PPC64
83 return pfn < max_pfn;
84#else
85 unsigned long paddr = (pfn << PAGE_SHIFT);
86 struct memblock_region *reg;
87
88 for_each_memblock(memory, reg)
89 if (paddr >= reg->base && paddr < (reg->base + reg->size))
90 return 1;
91 return 0;
92#endif
93}
94
95pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
96 unsigned long size, pgprot_t vma_prot)
97{
98 if (ppc_md.phys_mem_access_prot)
99 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
100
101 if (!page_is_ram(pfn))
102 vma_prot = pgprot_noncached(vma_prot);
103
104 return vma_prot;
105}
106EXPORT_SYMBOL(phys_mem_access_prot);
107
108#ifdef CONFIG_MEMORY_HOTPLUG
109
110#ifdef CONFIG_NUMA
111int memory_add_physaddr_to_nid(u64 start)
112{
113 return hot_add_scn_to_nid(start);
114}
115#endif
116
117int arch_add_memory(int nid, u64 start, u64 size)
118{
119 struct pglist_data *pgdata;
120 struct zone *zone;
121 unsigned long start_pfn = start >> PAGE_SHIFT;
122 unsigned long nr_pages = size >> PAGE_SHIFT;
123
124 pgdata = NODE_DATA(nid);
125
126 start = (unsigned long)__va(start);
127 if (create_section_mapping(start, start + size))
128 return -EINVAL;
129
130
131 zone = pgdata->node_zones;
132
133 return __add_pages(nid, zone, start_pfn, nr_pages);
134}
135
136#ifdef CONFIG_MEMORY_HOTREMOVE
137int arch_remove_memory(u64 start, u64 size)
138{
139 unsigned long start_pfn = start >> PAGE_SHIFT;
140 unsigned long nr_pages = size >> PAGE_SHIFT;
141 struct zone *zone;
142
143 zone = page_zone(pfn_to_page(start_pfn));
144 return __remove_pages(zone, start_pfn, nr_pages);
145}
146#endif
147#endif
148
149
150
151
152
153
154
155int
156walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
157 void *arg, int (*func)(unsigned long, unsigned long, void *))
158{
159 struct memblock_region *reg;
160 unsigned long end_pfn = start_pfn + nr_pages;
161 unsigned long tstart, tend;
162 int ret = -1;
163
164 for_each_memblock(memory, reg) {
165 tstart = max(start_pfn, memblock_region_memory_base_pfn(reg));
166 tend = min(end_pfn, memblock_region_memory_end_pfn(reg));
167 if (tstart >= tend)
168 continue;
169 ret = (*func)(tstart, tend - tstart, arg);
170 if (ret)
171 break;
172 }
173 return ret;
174}
175EXPORT_SYMBOL_GPL(walk_system_ram_range);
176
177
178
179
180
181
182#ifndef CONFIG_NEED_MULTIPLE_NODES
183void __init do_init_bootmem(void)
184{
185 unsigned long start, bootmap_pages;
186 unsigned long total_pages;
187 struct memblock_region *reg;
188 int boot_mapsize;
189
190 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
191 total_pages = (memblock_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT;
192#ifdef CONFIG_HIGHMEM
193 total_pages = total_lowmem >> PAGE_SHIFT;
194 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
195#endif
196
197
198
199
200
201
202 bootmap_pages = bootmem_bootmap_pages(total_pages);
203
204 start = memblock_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
205
206 min_low_pfn = MEMORY_START >> PAGE_SHIFT;
207 boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn);
208
209
210
211
212 memblock_set_node(0, (phys_addr_t)ULLONG_MAX, 0);
213
214
215
216
217#ifdef CONFIG_HIGHMEM
218 free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT);
219
220
221 for_each_memblock(reserved, reg) {
222 unsigned long top = reg->base + reg->size - 1;
223 if (top < lowmem_end_addr)
224 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
225 else if (reg->base < lowmem_end_addr) {
226 unsigned long trunc_size = lowmem_end_addr - reg->base;
227 reserve_bootmem(reg->base, trunc_size, BOOTMEM_DEFAULT);
228 }
229 }
230#else
231 free_bootmem_with_active_regions(0, max_pfn);
232
233
234 for_each_memblock(reserved, reg)
235 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
236#endif
237
238 sparse_memory_present_with_active_regions(0);
239
240 init_bootmem_done = 1;
241}
242
243
244static int __init mark_nonram_nosave(void)
245{
246 struct memblock_region *reg, *prev = NULL;
247
248 for_each_memblock(memory, reg) {
249 if (prev &&
250 memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg))
251 register_nosave_region(memblock_region_memory_end_pfn(prev),
252 memblock_region_memory_base_pfn(reg));
253 prev = reg;
254 }
255 return 0;
256}
257
258
259
260
261void __init paging_init(void)
262{
263 unsigned long long total_ram = memblock_phys_mem_size();
264 phys_addr_t top_of_ram = memblock_end_of_DRAM();
265 unsigned long max_zone_pfns[MAX_NR_ZONES];
266
267#ifdef CONFIG_PPC32
268 unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1);
269 unsigned long end = __fix_to_virt(FIX_HOLE);
270
271 for (; v < end; v += PAGE_SIZE)
272 map_page(v, 0, 0);
273#endif
274
275#ifdef CONFIG_HIGHMEM
276 map_page(PKMAP_BASE, 0, 0);
277 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
278
279 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
280 kmap_prot = PAGE_KERNEL;
281#endif
282
283 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
284 (unsigned long long)top_of_ram, total_ram);
285 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
286 (long int)((top_of_ram - total_ram) >> 20));
287 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
288#ifdef CONFIG_HIGHMEM
289 max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT;
290 max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT;
291#else
292 max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
293#endif
294 free_area_init_nodes(max_zone_pfns);
295
296 mark_nonram_nosave();
297}
298#endif
299
300static void __init register_page_bootmem_info(void)
301{
302 int i;
303
304 for_each_online_node(i)
305 register_page_bootmem_info_node(NODE_DATA(i));
306}
307
308void __init mem_init(void)
309{
310#ifdef CONFIG_SWIOTLB
311 swiotlb_init(0);
312#endif
313
314 register_page_bootmem_info();
315 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
316 set_max_mapnr(max_pfn);
317 free_all_bootmem();
318
319#ifdef CONFIG_HIGHMEM
320 {
321 unsigned long pfn, highmem_mapnr;
322
323 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
324 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
325 phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
326 struct page *page = pfn_to_page(pfn);
327 if (!memblock_is_reserved(paddr))
328 free_highmem_page(page);
329 }
330 }
331#endif
332
333#if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP)
334
335
336
337
338 per_cpu(next_tlbcam_idx, smp_processor_id()) =
339 (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
340#endif
341
342 mem_init_print_info(NULL);
343#ifdef CONFIG_PPC32
344 pr_info("Kernel virtual memory layout:\n");
345 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
346#ifdef CONFIG_HIGHMEM
347 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
348 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
349#endif
350#ifdef CONFIG_NOT_COHERENT_CACHE
351 pr_info(" * 0x%08lx..0x%08lx : consistent mem\n",
352 IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE);
353#endif
354 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
355 ioremap_bot, IOREMAP_TOP);
356 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
357 VMALLOC_START, VMALLOC_END);
358#endif
359
360 mem_init_done = 1;
361}
362
363void free_initmem(void)
364{
365 ppc_md.progress = ppc_printk_progress;
366 free_initmem_default(POISON_FREE_INITMEM);
367}
368
369#ifdef CONFIG_BLK_DEV_INITRD
370void __init free_initrd_mem(unsigned long start, unsigned long end)
371{
372 free_reserved_area((void *)start, (void *)end, -1, "initrd");
373}
374#endif
375
376
377
378
379
380
381void flush_dcache_page(struct page *page)
382{
383 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
384 return;
385
386 if (test_bit(PG_arch_1, &page->flags))
387 clear_bit(PG_arch_1, &page->flags);
388}
389EXPORT_SYMBOL(flush_dcache_page);
390
391void flush_dcache_icache_page(struct page *page)
392{
393#ifdef CONFIG_HUGETLB_PAGE
394 if (PageCompound(page)) {
395 flush_dcache_icache_hugepage(page);
396 return;
397 }
398#endif
399#ifdef CONFIG_BOOKE
400 {
401 void *start = kmap_atomic(page);
402 __flush_dcache_icache(start);
403 kunmap_atomic(start);
404 }
405#elif defined(CONFIG_8xx) || defined(CONFIG_PPC64)
406
407 __flush_dcache_icache(page_address(page));
408#else
409 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
410#endif
411}
412EXPORT_SYMBOL(flush_dcache_icache_page);
413
414void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
415{
416 clear_page(page);
417
418
419
420
421
422
423 flush_dcache_page(pg);
424}
425EXPORT_SYMBOL(clear_user_page);
426
427void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
428 struct page *pg)
429{
430 copy_page(vto, vfrom);
431
432
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435
436
437
438
439
440
441
442#if 0
443 if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
444 return;
445#endif
446
447 flush_dcache_page(pg);
448}
449
450void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
451 unsigned long addr, int len)
452{
453 unsigned long maddr;
454
455 maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
456 flush_icache_range(maddr, maddr + len);
457 kunmap(page);
458}
459EXPORT_SYMBOL(flush_icache_user_range);
460
461
462
463
464
465
466
467
468
469void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
470 pte_t *ptep)
471{
472#ifdef CONFIG_PPC_STD_MMU
473
474
475
476
477 unsigned long access = 0, trap;
478
479
480 if (!pte_young(*ptep) || address >= TASK_SIZE)
481 return;
482
483
484
485
486
487
488
489
490 if (current->thread.regs == NULL)
491 return;
492 trap = TRAP(current->thread.regs);
493 if (trap == 0x400)
494 access |= _PAGE_EXEC;
495 else if (trap != 0x300)
496 return;
497 hash_preload(vma->vm_mm, address, access, trap);
498#endif
499#if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \
500 && defined(CONFIG_HUGETLB_PAGE)
501 if (is_vm_hugetlb_page(vma))
502 book3e_hugetlb_preload(vma, address, *ptep);
503#endif
504}
505
506
507
508
509
510static int add_system_ram_resources(void)
511{
512 struct memblock_region *reg;
513
514 for_each_memblock(memory, reg) {
515 struct resource *res;
516 unsigned long base = reg->base;
517 unsigned long size = reg->size;
518
519 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
520 WARN_ON(!res);
521
522 if (res) {
523 res->name = "System RAM";
524 res->start = base;
525 res->end = base + size - 1;
526 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
527 WARN_ON(request_resource(&iomem_resource, res) < 0);
528 }
529 }
530
531 return 0;
532}
533subsys_initcall(add_system_ram_resources);
534
535#ifdef CONFIG_STRICT_DEVMEM
536
537
538
539
540
541
542
543int devmem_is_allowed(unsigned long pfn)
544{
545 if (iomem_is_exclusive(pfn << PAGE_SHIFT))
546 return 0;
547 if (!page_is_ram(pfn))
548 return 1;
549 if (page_is_rtas_user_buf(pfn))
550 return 1;
551 return 0;
552}
553#endif
554