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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
55#include "mmu_decl.h"
56
57#ifndef CPU_FTR_COHERENT_ICACHE
58#define CPU_FTR_COHERENT_ICACHE 0
59#define CPU_FTR_NOEXECUTE 0
60#endif
61
62int init_bootmem_done;
63int mem_init_done;
64phys_addr_t memory_limit;
65
66#ifdef CONFIG_HIGHMEM
67pte_t *kmap_pte;
68pgprot_t kmap_prot;
69
70EXPORT_SYMBOL(kmap_prot);
71EXPORT_SYMBOL(kmap_pte);
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#endif
136
137
138
139
140
141
142
143int
144walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
145 void *arg, int (*func)(unsigned long, unsigned long, void *))
146{
147 struct memblock_region *reg;
148 unsigned long end_pfn = start_pfn + nr_pages;
149 unsigned long tstart, tend;
150 int ret = -1;
151
152 for_each_memblock(memory, reg) {
153 tstart = max(start_pfn, memblock_region_memory_base_pfn(reg));
154 tend = min(end_pfn, memblock_region_memory_end_pfn(reg));
155 if (tstart >= tend)
156 continue;
157 ret = (*func)(tstart, tend - tstart, arg);
158 if (ret)
159 break;
160 }
161 return ret;
162}
163EXPORT_SYMBOL_GPL(walk_system_ram_range);
164
165
166
167
168
169
170#ifndef CONFIG_NEED_MULTIPLE_NODES
171void __init do_init_bootmem(void)
172{
173 unsigned long start, bootmap_pages;
174 unsigned long total_pages;
175 struct memblock_region *reg;
176 int boot_mapsize;
177
178 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
179 total_pages = (memblock_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT;
180#ifdef CONFIG_HIGHMEM
181 total_pages = total_lowmem >> PAGE_SHIFT;
182 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
183#endif
184
185
186
187
188
189
190 bootmap_pages = bootmem_bootmap_pages(total_pages);
191
192 start = memblock_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
193
194 min_low_pfn = MEMORY_START >> PAGE_SHIFT;
195 boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn);
196
197
198 for_each_memblock(memory, reg) {
199 unsigned long start_pfn, end_pfn;
200 start_pfn = memblock_region_memory_base_pfn(reg);
201 end_pfn = memblock_region_memory_end_pfn(reg);
202 add_active_range(0, start_pfn, end_pfn);
203 }
204
205
206
207
208#ifdef CONFIG_HIGHMEM
209 free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT);
210
211
212 for_each_memblock(reserved, reg) {
213 unsigned long top = reg->base + reg->size - 1;
214 if (top < lowmem_end_addr)
215 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
216 else if (reg->base < lowmem_end_addr) {
217 unsigned long trunc_size = lowmem_end_addr - reg->base;
218 reserve_bootmem(reg->base, trunc_size, BOOTMEM_DEFAULT);
219 }
220 }
221#else
222 free_bootmem_with_active_regions(0, max_pfn);
223
224
225 for_each_memblock(reserved, reg)
226 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
227#endif
228
229 sparse_memory_present_with_active_regions(0);
230
231 init_bootmem_done = 1;
232}
233
234
235static int __init mark_nonram_nosave(void)
236{
237 struct memblock_region *reg, *prev = NULL;
238
239 for_each_memblock(memory, reg) {
240 if (prev &&
241 memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg))
242 register_nosave_region(memblock_region_memory_end_pfn(prev),
243 memblock_region_memory_base_pfn(reg));
244 prev = reg;
245 }
246 return 0;
247}
248
249
250
251
252void __init paging_init(void)
253{
254 unsigned long long total_ram = memblock_phys_mem_size();
255 phys_addr_t top_of_ram = memblock_end_of_DRAM();
256 unsigned long max_zone_pfns[MAX_NR_ZONES];
257
258#ifdef CONFIG_PPC32
259 unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1);
260 unsigned long end = __fix_to_virt(FIX_HOLE);
261
262 for (; v < end; v += PAGE_SIZE)
263 map_page(v, 0, 0);
264#endif
265
266#ifdef CONFIG_HIGHMEM
267 map_page(PKMAP_BASE, 0, 0);
268 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
269
270 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
271 kmap_prot = PAGE_KERNEL;
272#endif
273
274 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
275 (unsigned long long)top_of_ram, total_ram);
276 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
277 (long int)((top_of_ram - total_ram) >> 20));
278 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
279#ifdef CONFIG_HIGHMEM
280 max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT;
281 max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT;
282#else
283 max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
284#endif
285 free_area_init_nodes(max_zone_pfns);
286
287 mark_nonram_nosave();
288}
289#endif
290
291void __init mem_init(void)
292{
293#ifdef CONFIG_NEED_MULTIPLE_NODES
294 int nid;
295#endif
296 pg_data_t *pgdat;
297 unsigned long i;
298 struct page *page;
299 unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
300
301#ifdef CONFIG_SWIOTLB
302 if (ppc_swiotlb_enable)
303 swiotlb_init(1);
304#endif
305
306 num_physpages = memblock_phys_mem_size() >> PAGE_SHIFT;
307 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
308
309#ifdef CONFIG_NEED_MULTIPLE_NODES
310 for_each_online_node(nid) {
311 if (NODE_DATA(nid)->node_spanned_pages != 0) {
312 printk("freeing bootmem node %d\n", nid);
313 totalram_pages +=
314 free_all_bootmem_node(NODE_DATA(nid));
315 }
316 }
317#else
318 max_mapnr = max_pfn;
319 totalram_pages += free_all_bootmem();
320#endif
321 for_each_online_pgdat(pgdat) {
322 for (i = 0; i < pgdat->node_spanned_pages; i++) {
323 if (!pfn_valid(pgdat->node_start_pfn + i))
324 continue;
325 page = pgdat_page_nr(pgdat, i);
326 if (PageReserved(page))
327 reservedpages++;
328 }
329 }
330
331 codesize = (unsigned long)&_sdata - (unsigned long)&_stext;
332 datasize = (unsigned long)&_edata - (unsigned long)&_sdata;
333 initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
334 bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start;
335
336#ifdef CONFIG_HIGHMEM
337 {
338 unsigned long pfn, highmem_mapnr;
339
340 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
341 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
342 phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
343 struct page *page = pfn_to_page(pfn);
344 if (memblock_is_reserved(paddr))
345 continue;
346 ClearPageReserved(page);
347 init_page_count(page);
348 __free_page(page);
349 totalhigh_pages++;
350 reservedpages--;
351 }
352 totalram_pages += totalhigh_pages;
353 printk(KERN_DEBUG "High memory: %luk\n",
354 totalhigh_pages << (PAGE_SHIFT-10));
355 }
356#endif
357
358#if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP)
359
360
361
362
363 per_cpu(next_tlbcam_idx, smp_processor_id()) =
364 (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
365#endif
366
367 printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, "
368 "%luk reserved, %luk data, %luk bss, %luk init)\n",
369 nr_free_pages() << (PAGE_SHIFT-10),
370 num_physpages << (PAGE_SHIFT-10),
371 codesize >> 10,
372 reservedpages << (PAGE_SHIFT-10),
373 datasize >> 10,
374 bsssize >> 10,
375 initsize >> 10);
376
377#ifdef CONFIG_PPC32
378 pr_info("Kernel virtual memory layout:\n");
379 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
380#ifdef CONFIG_HIGHMEM
381 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
382 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
383#endif
384#ifdef CONFIG_NOT_COHERENT_CACHE
385 pr_info(" * 0x%08lx..0x%08lx : consistent mem\n",
386 IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE);
387#endif
388 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
389 ioremap_bot, IOREMAP_TOP);
390 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
391 VMALLOC_START, VMALLOC_END);
392#endif
393
394 mem_init_done = 1;
395}
396
397void free_initmem(void)
398{
399 unsigned long addr;
400
401 ppc_md.progress = ppc_printk_progress;
402
403 addr = (unsigned long)__init_begin;
404 for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
405 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
406 ClearPageReserved(virt_to_page(addr));
407 init_page_count(virt_to_page(addr));
408 free_page(addr);
409 totalram_pages++;
410 }
411 pr_info("Freeing unused kernel memory: %luk freed\n",
412 ((unsigned long)__init_end -
413 (unsigned long)__init_begin) >> 10);
414}
415
416#ifdef CONFIG_BLK_DEV_INITRD
417void __init free_initrd_mem(unsigned long start, unsigned long end)
418{
419 if (start >= end)
420 return;
421
422 start = _ALIGN_DOWN(start, PAGE_SIZE);
423 end = _ALIGN_UP(end, PAGE_SIZE);
424 pr_info("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
425
426 for (; start < end; start += PAGE_SIZE) {
427 ClearPageReserved(virt_to_page(start));
428 init_page_count(virt_to_page(start));
429 free_page(start);
430 totalram_pages++;
431 }
432}
433#endif
434
435
436
437
438
439
440void flush_dcache_page(struct page *page)
441{
442 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
443 return;
444
445 if (test_bit(PG_arch_1, &page->flags))
446 clear_bit(PG_arch_1, &page->flags);
447}
448EXPORT_SYMBOL(flush_dcache_page);
449
450void flush_dcache_icache_page(struct page *page)
451{
452#ifdef CONFIG_HUGETLB_PAGE
453 if (PageCompound(page)) {
454 flush_dcache_icache_hugepage(page);
455 return;
456 }
457#endif
458#ifdef CONFIG_BOOKE
459 {
460 void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE);
461 __flush_dcache_icache(start);
462 kunmap_atomic(start, KM_PPC_SYNC_ICACHE);
463 }
464#elif defined(CONFIG_8xx) || defined(CONFIG_PPC64)
465
466 __flush_dcache_icache(page_address(page));
467#else
468 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
469#endif
470}
471
472void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
473{
474 clear_page(page);
475
476
477
478
479
480
481 flush_dcache_page(pg);
482}
483EXPORT_SYMBOL(clear_user_page);
484
485void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
486 struct page *pg)
487{
488 copy_page(vto, vfrom);
489
490
491
492
493
494
495
496
497
498
499
500#if 0
501 if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
502 return;
503#endif
504
505 flush_dcache_page(pg);
506}
507
508void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
509 unsigned long addr, int len)
510{
511 unsigned long maddr;
512
513 maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
514 flush_icache_range(maddr, maddr + len);
515 kunmap(page);
516}
517EXPORT_SYMBOL(flush_icache_user_range);
518
519
520
521
522
523
524
525
526
527void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
528 pte_t *ptep)
529{
530#ifdef CONFIG_PPC_STD_MMU
531 unsigned long access = 0, trap;
532
533
534 if (!pte_young(*ptep) || address >= TASK_SIZE)
535 return;
536
537
538
539
540
541
542
543
544 if (current->thread.regs == NULL)
545 return;
546 trap = TRAP(current->thread.regs);
547 if (trap == 0x400)
548 access |= _PAGE_EXEC;
549 else if (trap != 0x300)
550 return;
551 hash_preload(vma->vm_mm, address, access, trap);
552#endif
553#if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \
554 && defined(CONFIG_HUGETLB_PAGE)
555 if (is_vm_hugetlb_page(vma))
556 book3e_hugetlb_preload(vma->vm_mm, address, *ptep);
557#endif
558}
559
560
561
562
563
564static int add_system_ram_resources(void)
565{
566 struct memblock_region *reg;
567
568 for_each_memblock(memory, reg) {
569 struct resource *res;
570 unsigned long base = reg->base;
571 unsigned long size = reg->size;
572
573 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
574 WARN_ON(!res);
575
576 if (res) {
577 res->name = "System RAM";
578 res->start = base;
579 res->end = base + size - 1;
580 res->flags = IORESOURCE_MEM;
581 WARN_ON(request_resource(&iomem_resource, res) < 0);
582 }
583 }
584
585 return 0;
586}
587subsys_initcall(add_system_ram_resources);
588