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14cf11af PM |
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 | |
14cf11af PM |
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 | ||
4b16f8e2 | 20 | #include <linux/export.h> |
14cf11af PM |
21 | #include <linux/sched.h> |
22 | #include <linux/kernel.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/string.h> | |
5a0e3ad6 | 25 | #include <linux/gfp.h> |
14cf11af PM |
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> | |
4e8ad3e8 | 34 | #include <linux/suspend.h> |
95f72d1e | 35 | #include <linux/memblock.h> |
0895ecda | 36 | #include <linux/hugetlb.h> |
c40dd2f7 | 37 | #include <linux/slab.h> |
14cf11af PM |
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> | |
7c8c6b97 | 49 | #include <asm/sections.h> |
db7f37de | 50 | #include <asm/sparsemem.h> |
ab1f9dac | 51 | #include <asm/vdso.h> |
2c419bde | 52 | #include <asm/fixmap.h> |
a9327296 | 53 | #include <asm/swiotlb.h> |
8a3e3d31 | 54 | #include <asm/rtas.h> |
14cf11af | 55 | |
14cf11af PM |
56 | #include "mmu_decl.h" |
57 | ||
58 | #ifndef CPU_FTR_COHERENT_ICACHE | |
59 | #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */ | |
60 | #define CPU_FTR_NOEXECUTE 0 | |
61 | #endif | |
62 | ||
7c8c6b97 PM |
63 | int init_bootmem_done; |
64 | int mem_init_done; | |
a84fcd46 | 65 | unsigned long long memory_limit; |
7c8c6b97 | 66 | |
2c419bde KG |
67 | #ifdef CONFIG_HIGHMEM |
68 | pte_t *kmap_pte; | |
69 | pgprot_t kmap_prot; | |
70 | ||
71 | EXPORT_SYMBOL(kmap_prot); | |
72 | EXPORT_SYMBOL(kmap_pte); | |
73 | ||
74 | static inline pte_t *virt_to_kpte(unsigned long vaddr) | |
75 | { | |
76 | return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), | |
77 | vaddr), vaddr), vaddr); | |
78 | } | |
79 | #endif | |
80 | ||
14cf11af PM |
81 | int page_is_ram(unsigned long pfn) |
82 | { | |
14cf11af | 83 | #ifndef CONFIG_PPC64 /* XXX for now */ |
a880e762 | 84 | return pfn < max_pfn; |
14cf11af | 85 | #else |
a880e762 | 86 | unsigned long paddr = (pfn << PAGE_SHIFT); |
28be7072 | 87 | struct memblock_region *reg; |
14cf11af | 88 | |
28be7072 BH |
89 | for_each_memblock(memory, reg) |
90 | if (paddr >= reg->base && paddr < (reg->base + reg->size)) | |
14cf11af | 91 | return 1; |
14cf11af PM |
92 | return 0; |
93 | #endif | |
94 | } | |
14cf11af | 95 | |
8b150478 | 96 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
14cf11af PM |
97 | unsigned long size, pgprot_t vma_prot) |
98 | { | |
99 | if (ppc_md.phys_mem_access_prot) | |
8b150478 | 100 | return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); |
14cf11af | 101 | |
8b150478 | 102 | if (!page_is_ram(pfn)) |
64b3d0e8 BH |
103 | vma_prot = pgprot_noncached(vma_prot); |
104 | ||
14cf11af PM |
105 | return vma_prot; |
106 | } | |
107 | EXPORT_SYMBOL(phys_mem_access_prot); | |
108 | ||
23fd0775 PM |
109 | #ifdef CONFIG_MEMORY_HOTPLUG |
110 | ||
bc02af93 YG |
111 | #ifdef CONFIG_NUMA |
112 | int memory_add_physaddr_to_nid(u64 start) | |
113 | { | |
114 | return hot_add_scn_to_nid(start); | |
115 | } | |
116 | #endif | |
117 | ||
fa90f70a | 118 | int arch_add_memory(int nid, u64 start, u64 size) |
23fd0775 | 119 | { |
237a0989 | 120 | struct pglist_data *pgdata; |
23fd0775 PM |
121 | struct zone *zone; |
122 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
123 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
124 | ||
237a0989 MK |
125 | pgdata = NODE_DATA(nid); |
126 | ||
2d0eee14 | 127 | start = (unsigned long)__va(start); |
a1194097 AB |
128 | if (create_section_mapping(start, start + size)) |
129 | return -EINVAL; | |
54b79248 | 130 | |
23fd0775 PM |
131 | /* this should work for most non-highmem platforms */ |
132 | zone = pgdata->node_zones; | |
133 | ||
c04fc586 | 134 | return __add_pages(nid, zone, start_pfn, nr_pages); |
23fd0775 | 135 | } |
0d579944 | 136 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
a99824f3 BP |
137 | |
138 | /* | |
139 | * walk_memory_resource() needs to make sure there is no holes in a given | |
9d88a2eb | 140 | * memory range. PPC64 does not maintain the memory layout in /proc/iomem. |
95f72d1e | 141 | * Instead it maintains it in memblock.memory structures. Walk through the |
9d88a2eb | 142 | * memory regions, find holes and callback for contiguous regions. |
a99824f3 BP |
143 | */ |
144 | int | |
908eedc6 KH |
145 | walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, |
146 | void *arg, int (*func)(unsigned long, unsigned long, void *)) | |
a99824f3 | 147 | { |
28be7072 BH |
148 | struct memblock_region *reg; |
149 | unsigned long end_pfn = start_pfn + nr_pages; | |
150 | unsigned long tstart, tend; | |
9d88a2eb BP |
151 | int ret = -1; |
152 | ||
28be7072 | 153 | for_each_memblock(memory, reg) { |
c7fc2de0 YL |
154 | tstart = max(start_pfn, memblock_region_memory_base_pfn(reg)); |
155 | tend = min(end_pfn, memblock_region_memory_end_pfn(reg)); | |
28be7072 BH |
156 | if (tstart >= tend) |
157 | continue; | |
158 | ret = (*func)(tstart, tend - tstart, arg); | |
9d88a2eb BP |
159 | if (ret) |
160 | break; | |
9d88a2eb BP |
161 | } |
162 | return ret; | |
a99824f3 | 163 | } |
908eedc6 | 164 | EXPORT_SYMBOL_GPL(walk_system_ram_range); |
a99824f3 | 165 | |
7c8c6b97 PM |
166 | /* |
167 | * Initialize the bootmem system and give it all the memory we | |
168 | * have available. If we are using highmem, we only put the | |
169 | * lowmem into the bootmem system. | |
170 | */ | |
171 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
172 | void __init do_init_bootmem(void) | |
173 | { | |
7c8c6b97 PM |
174 | unsigned long start, bootmap_pages; |
175 | unsigned long total_pages; | |
28be7072 | 176 | struct memblock_region *reg; |
7c8c6b97 PM |
177 | int boot_mapsize; |
178 | ||
95f72d1e YL |
179 | max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; |
180 | total_pages = (memblock_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT; | |
7c8c6b97 PM |
181 | #ifdef CONFIG_HIGHMEM |
182 | total_pages = total_lowmem >> PAGE_SHIFT; | |
d7917ba7 | 183 | max_low_pfn = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 PM |
184 | #endif |
185 | ||
186 | /* | |
187 | * Find an area to use for the bootmem bitmap. Calculate the size of | |
188 | * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE. | |
189 | * Add 1 additional page in case the address isn't page-aligned. | |
190 | */ | |
191 | bootmap_pages = bootmem_bootmap_pages(total_pages); | |
192 | ||
95f72d1e | 193 | start = memblock_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE); |
7c8c6b97 | 194 | |
37dd2bad KG |
195 | min_low_pfn = MEMORY_START >> PAGE_SHIFT; |
196 | boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn); | |
7c8c6b97 | 197 | |
c67c3cb4 | 198 | /* Add active regions with valid PFNs */ |
28be7072 | 199 | for_each_memblock(memory, reg) { |
c67c3cb4 | 200 | unsigned long start_pfn, end_pfn; |
c7fc2de0 YL |
201 | start_pfn = memblock_region_memory_base_pfn(reg); |
202 | end_pfn = memblock_region_memory_end_pfn(reg); | |
1d7cfe18 | 203 | memblock_set_node(0, (phys_addr_t)ULLONG_MAX, 0); |
c67c3cb4 MG |
204 | } |
205 | ||
7c8c6b97 PM |
206 | /* Add all physical memory to the bootmem map, mark each area |
207 | * present. | |
208 | */ | |
7c8c6b97 | 209 | #ifdef CONFIG_HIGHMEM |
d7917ba7 | 210 | free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT); |
f98eeb4e KG |
211 | |
212 | /* reserve the sections we're already using */ | |
28be7072 BH |
213 | for_each_memblock(reserved, reg) { |
214 | unsigned long top = reg->base + reg->size - 1; | |
215 | if (top < lowmem_end_addr) | |
216 | reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); | |
217 | else if (reg->base < lowmem_end_addr) { | |
218 | unsigned long trunc_size = lowmem_end_addr - reg->base; | |
219 | reserve_bootmem(reg->base, trunc_size, BOOTMEM_DEFAULT); | |
f98eeb4e KG |
220 | } |
221 | } | |
c67c3cb4 MG |
222 | #else |
223 | free_bootmem_with_active_regions(0, max_pfn); | |
7c8c6b97 PM |
224 | |
225 | /* reserve the sections we're already using */ | |
28be7072 BH |
226 | for_each_memblock(reserved, reg) |
227 | reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); | |
f98eeb4e | 228 | #endif |
7c8c6b97 | 229 | /* XXX need to clip this if using highmem? */ |
c67c3cb4 MG |
230 | sparse_memory_present_with_active_regions(0); |
231 | ||
7c8c6b97 PM |
232 | init_bootmem_done = 1; |
233 | } | |
234 | ||
4e8ad3e8 JB |
235 | /* mark pages that don't exist as nosave */ |
236 | static int __init mark_nonram_nosave(void) | |
237 | { | |
28be7072 BH |
238 | struct memblock_region *reg, *prev = NULL; |
239 | ||
240 | for_each_memblock(memory, reg) { | |
241 | if (prev && | |
c7fc2de0 YL |
242 | memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg)) |
243 | register_nosave_region(memblock_region_memory_end_pfn(prev), | |
244 | memblock_region_memory_base_pfn(reg)); | |
28be7072 | 245 | prev = reg; |
4e8ad3e8 | 246 | } |
4e8ad3e8 JB |
247 | return 0; |
248 | } | |
249 | ||
7c8c6b97 PM |
250 | /* |
251 | * paging_init() sets up the page tables - in fact we've already done this. | |
252 | */ | |
253 | void __init paging_init(void) | |
254 | { | |
f7ba2991 | 255 | unsigned long long total_ram = memblock_phys_mem_size(); |
95f72d1e | 256 | phys_addr_t top_of_ram = memblock_end_of_DRAM(); |
c67c3cb4 | 257 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
7c8c6b97 | 258 | |
2c419bde KG |
259 | #ifdef CONFIG_PPC32 |
260 | unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1); | |
261 | unsigned long end = __fix_to_virt(FIX_HOLE); | |
262 | ||
263 | for (; v < end; v += PAGE_SIZE) | |
264 | map_page(v, 0, 0); /* XXX gross */ | |
265 | #endif | |
266 | ||
7c8c6b97 PM |
267 | #ifdef CONFIG_HIGHMEM |
268 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ | |
2c419bde KG |
269 | pkmap_page_table = virt_to_kpte(PKMAP_BASE); |
270 | ||
271 | kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); | |
7c8c6b97 PM |
272 | kmap_prot = PAGE_KERNEL; |
273 | #endif /* CONFIG_HIGHMEM */ | |
274 | ||
f7ba2991 | 275 | printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n", |
fb610635 | 276 | (unsigned long long)top_of_ram, total_ram); |
e110b281 | 277 | printk(KERN_DEBUG "Memory hole size: %ldMB\n", |
2bf3016f | 278 | (long int)((top_of_ram - total_ram) >> 20)); |
6391af17 | 279 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
7c8c6b97 | 280 | #ifdef CONFIG_HIGHMEM |
d7917ba7 | 281 | max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT; |
6391af17 | 282 | max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT; |
7c8c6b97 | 283 | #else |
6391af17 | 284 | max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; |
c67c3cb4 MG |
285 | #endif |
286 | free_area_init_nodes(max_zone_pfns); | |
4e8ad3e8 JB |
287 | |
288 | mark_nonram_nosave(); | |
7c8c6b97 PM |
289 | } |
290 | #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ | |
291 | ||
292 | void __init mem_init(void) | |
293 | { | |
294 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
295 | int nid; | |
296 | #endif | |
297 | pg_data_t *pgdat; | |
298 | unsigned long i; | |
299 | struct page *page; | |
300 | unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize; | |
301 | ||
a9327296 | 302 | #ifdef CONFIG_SWIOTLB |
688ba1db | 303 | swiotlb_init(0); |
a9327296 FT |
304 | #endif |
305 | ||
4734b594 | 306 | num_physpages = memblock_phys_mem_size() >> PAGE_SHIFT; |
7c8c6b97 PM |
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) { | |
c258dd40 | 312 | printk("freeing bootmem node %d\n", nid); |
7c8c6b97 PM |
313 | totalram_pages += |
314 | free_all_bootmem_node(NODE_DATA(nid)); | |
315 | } | |
316 | } | |
317 | #else | |
fb6d73d3 | 318 | max_mapnr = max_pfn; |
7c8c6b97 PM |
319 | totalram_pages += free_all_bootmem(); |
320 | #endif | |
ec936fc5 | 321 | for_each_online_pgdat(pgdat) { |
7c8c6b97 | 322 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
fb6d73d3 PM |
323 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
324 | continue; | |
7c8c6b97 PM |
325 | page = pgdat_page_nr(pgdat, i); |
326 | if (PageReserved(page)) | |
327 | reservedpages++; | |
328 | } | |
329 | } | |
330 | ||
331 | codesize = (unsigned long)&_sdata - (unsigned long)&_stext; | |
bcb35576 | 332 | datasize = (unsigned long)&_edata - (unsigned long)&_sdata; |
7c8c6b97 PM |
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 | ||
d7917ba7 | 340 | highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 | 341 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { |
3d41e0f6 | 342 | phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT; |
7c8c6b97 | 343 | struct page *page = pfn_to_page(pfn); |
3d41e0f6 | 344 | if (memblock_is_reserved(paddr)) |
f98eeb4e | 345 | continue; |
7c8c6b97 | 346 | ClearPageReserved(page); |
7835e98b | 347 | init_page_count(page); |
7c8c6b97 PM |
348 | __free_page(page); |
349 | totalhigh_pages++; | |
f98eeb4e | 350 | reservedpages--; |
7c8c6b97 PM |
351 | } |
352 | totalram_pages += totalhigh_pages; | |
e110b281 | 353 | printk(KERN_DEBUG "High memory: %luk\n", |
7c8c6b97 PM |
354 | totalhigh_pages << (PAGE_SHIFT-10)); |
355 | } | |
356 | #endif /* CONFIG_HIGHMEM */ | |
357 | ||
3160b097 BB |
358 | #if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP) |
359 | /* | |
360 | * If smp is enabled, next_tlbcam_idx is initialized in the cpu up | |
361 | * functions.... do it here for the non-smp case. | |
362 | */ | |
363 | per_cpu(next_tlbcam_idx, smp_processor_id()) = | |
364 | (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1; | |
365 | #endif | |
366 | ||
7c8c6b97 PM |
367 | printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, " |
368 | "%luk reserved, %luk data, %luk bss, %luk init)\n", | |
cc013a88 | 369 | nr_free_pages() << (PAGE_SHIFT-10), |
7c8c6b97 PM |
370 | num_physpages << (PAGE_SHIFT-10), |
371 | codesize >> 10, | |
372 | reservedpages << (PAGE_SHIFT-10), | |
373 | datasize >> 10, | |
374 | bsssize >> 10, | |
375 | initsize >> 10); | |
376 | ||
f637a49e BH |
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 /* CONFIG_HIGHMEM */ | |
8b31e49d BH |
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 /* CONFIG_NOT_COHERENT_CACHE */ | |
f637a49e BH |
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 /* CONFIG_PPC32 */ | |
393 | ||
7c8c6b97 | 394 | mem_init_done = 1; |
7c8c6b97 PM |
395 | } |
396 | ||
2773fcc8 DC |
397 | void free_initmem(void) |
398 | { | |
399 | unsigned long addr; | |
400 | ||
a9c0f41b | 401 | ppc_md.progress = ppc_printk_progress; |
2773fcc8 DC |
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 | ||
307cfe71 BH |
416 | #ifdef CONFIG_BLK_DEV_INITRD |
417 | void __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 | ||
14cf11af PM |
435 | /* |
436 | * This is called when a page has been modified by the kernel. | |
437 | * It just marks the page as not i-cache clean. We do the i-cache | |
438 | * flush later when the page is given to a user process, if necessary. | |
439 | */ | |
440 | void flush_dcache_page(struct page *page) | |
441 | { | |
442 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
443 | return; | |
444 | /* avoid an atomic op if possible */ | |
445 | if (test_bit(PG_arch_1, &page->flags)) | |
446 | clear_bit(PG_arch_1, &page->flags); | |
447 | } | |
448 | EXPORT_SYMBOL(flush_dcache_page); | |
449 | ||
450 | void flush_dcache_icache_page(struct page *page) | |
451 | { | |
0895ecda DG |
452 | #ifdef CONFIG_HUGETLB_PAGE |
453 | if (PageCompound(page)) { | |
454 | flush_dcache_icache_hugepage(page); | |
455 | return; | |
456 | } | |
457 | #endif | |
14cf11af | 458 | #ifdef CONFIG_BOOKE |
0895ecda | 459 | { |
2480b208 | 460 | void *start = kmap_atomic(page); |
0895ecda | 461 | __flush_dcache_icache(start); |
2480b208 | 462 | kunmap_atomic(start); |
0895ecda | 463 | } |
ab1f9dac | 464 | #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) |
14cf11af PM |
465 | /* On 8xx there is no need to kmap since highmem is not supported */ |
466 | __flush_dcache_icache(page_address(page)); | |
467 | #else | |
468 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); | |
469 | #endif | |
14cf11af | 470 | } |
249ba1ee | 471 | EXPORT_SYMBOL(flush_dcache_icache_page); |
0895ecda | 472 | |
14cf11af PM |
473 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) |
474 | { | |
475 | clear_page(page); | |
476 | ||
14cf11af | 477 | /* |
25985edc | 478 | * We shouldn't have to do this, but some versions of glibc |
14cf11af PM |
479 | * require it (ld.so assumes zero filled pages are icache clean) |
480 | * - Anton | |
481 | */ | |
09f5dc44 | 482 | flush_dcache_page(pg); |
14cf11af PM |
483 | } |
484 | EXPORT_SYMBOL(clear_user_page); | |
485 | ||
486 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
487 | struct page *pg) | |
488 | { | |
489 | copy_page(vto, vfrom); | |
490 | ||
491 | /* | |
492 | * We should be able to use the following optimisation, however | |
493 | * there are two problems. | |
494 | * Firstly a bug in some versions of binutils meant PLT sections | |
495 | * were not marked executable. | |
496 | * Secondly the first word in the GOT section is blrl, used | |
497 | * to establish the GOT address. Until recently the GOT was | |
498 | * not marked executable. | |
499 | * - Anton | |
500 | */ | |
501 | #if 0 | |
502 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) | |
503 | return; | |
504 | #endif | |
505 | ||
09f5dc44 | 506 | flush_dcache_page(pg); |
14cf11af PM |
507 | } |
508 | ||
509 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
510 | unsigned long addr, int len) | |
511 | { | |
512 | unsigned long maddr; | |
513 | ||
514 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); | |
515 | flush_icache_range(maddr, maddr + len); | |
516 | kunmap(page); | |
517 | } | |
518 | EXPORT_SYMBOL(flush_icache_user_range); | |
519 | ||
520 | /* | |
521 | * This is called at the end of handling a user page fault, when the | |
522 | * fault has been handled by updating a PTE in the linux page tables. | |
523 | * We use it to preload an HPTE into the hash table corresponding to | |
524 | * the updated linux PTE. | |
525 | * | |
01edcd89 | 526 | * This must always be called with the pte lock held. |
14cf11af PM |
527 | */ |
528 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, | |
4b3073e1 | 529 | pte_t *ptep) |
14cf11af | 530 | { |
3c726f8d BH |
531 | #ifdef CONFIG_PPC_STD_MMU |
532 | unsigned long access = 0, trap; | |
14cf11af | 533 | |
14cf11af | 534 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ |
4b3073e1 | 535 | if (!pte_young(*ptep) || address >= TASK_SIZE) |
14cf11af | 536 | return; |
14cf11af | 537 | |
3c726f8d BH |
538 | /* We try to figure out if we are coming from an instruction |
539 | * access fault and pass that down to __hash_page so we avoid | |
540 | * double-faulting on execution of fresh text. We have to test | |
541 | * for regs NULL since init will get here first thing at boot | |
542 | * | |
543 | * We also avoid filling the hash if not coming from a fault | |
544 | */ | |
545 | if (current->thread.regs == NULL) | |
14cf11af | 546 | return; |
3c726f8d BH |
547 | trap = TRAP(current->thread.regs); |
548 | if (trap == 0x400) | |
549 | access |= _PAGE_EXEC; | |
550 | else if (trap != 0x300) | |
551 | return; | |
552 | hash_preload(vma->vm_mm, address, access, trap); | |
553 | #endif /* CONFIG_PPC_STD_MMU */ | |
41151e77 BB |
554 | #if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \ |
555 | && defined(CONFIG_HUGETLB_PAGE) | |
556 | if (is_vm_hugetlb_page(vma)) | |
d93e4d7d | 557 | book3e_hugetlb_preload(vma, address, *ptep); |
41151e77 | 558 | #endif |
14cf11af | 559 | } |
c40dd2f7 AB |
560 | |
561 | /* | |
562 | * System memory should not be in /proc/iomem but various tools expect it | |
563 | * (eg kdump). | |
564 | */ | |
565 | static int add_system_ram_resources(void) | |
566 | { | |
567 | struct memblock_region *reg; | |
568 | ||
569 | for_each_memblock(memory, reg) { | |
570 | struct resource *res; | |
571 | unsigned long base = reg->base; | |
572 | unsigned long size = reg->size; | |
573 | ||
574 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
575 | WARN_ON(!res); | |
576 | ||
577 | if (res) { | |
578 | res->name = "System RAM"; | |
579 | res->start = base; | |
580 | res->end = base + size - 1; | |
581 | res->flags = IORESOURCE_MEM; | |
582 | WARN_ON(request_resource(&iomem_resource, res) < 0); | |
583 | } | |
584 | } | |
585 | ||
586 | return 0; | |
587 | } | |
588 | subsys_initcall(add_system_ram_resources); | |
1d54cf2b | 589 | |
590 | #ifdef CONFIG_STRICT_DEVMEM | |
591 | /* | |
592 | * devmem_is_allowed(): check to see if /dev/mem access to a certain address | |
593 | * is valid. The argument is a physical page number. | |
594 | * | |
595 | * Access has to be given to non-kernel-ram areas as well, these contain the | |
596 | * PCI mmio resources as well as potential bios/acpi data regions. | |
597 | */ | |
598 | int devmem_is_allowed(unsigned long pfn) | |
599 | { | |
600 | if (iomem_is_exclusive(pfn << PAGE_SHIFT)) | |
601 | return 0; | |
602 | if (!page_is_ram(pfn)) | |
603 | return 1; | |
8a3e3d31 | 604 | if (page_is_rtas_user_buf(pfn)) |
605 | return 1; | |
1d54cf2b | 606 | return 0; |
607 | } | |
608 | #endif /* CONFIG_STRICT_DEVMEM */ |