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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 | } |
24d335ca WC |
136 | |
137 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
138 | int arch_remove_memory(u64 start, u64 size) | |
139 | { | |
140 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
141 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
142 | struct zone *zone; | |
143 | ||
144 | zone = page_zone(pfn_to_page(start_pfn)); | |
145 | return __remove_pages(zone, start_pfn, nr_pages); | |
146 | } | |
147 | #endif | |
0d579944 | 148 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
a99824f3 BP |
149 | |
150 | /* | |
151 | * walk_memory_resource() needs to make sure there is no holes in a given | |
9d88a2eb | 152 | * memory range. PPC64 does not maintain the memory layout in /proc/iomem. |
95f72d1e | 153 | * Instead it maintains it in memblock.memory structures. Walk through the |
9d88a2eb | 154 | * memory regions, find holes and callback for contiguous regions. |
a99824f3 BP |
155 | */ |
156 | int | |
908eedc6 KH |
157 | walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, |
158 | void *arg, int (*func)(unsigned long, unsigned long, void *)) | |
a99824f3 | 159 | { |
28be7072 BH |
160 | struct memblock_region *reg; |
161 | unsigned long end_pfn = start_pfn + nr_pages; | |
162 | unsigned long tstart, tend; | |
9d88a2eb BP |
163 | int ret = -1; |
164 | ||
28be7072 | 165 | for_each_memblock(memory, reg) { |
c7fc2de0 YL |
166 | tstart = max(start_pfn, memblock_region_memory_base_pfn(reg)); |
167 | tend = min(end_pfn, memblock_region_memory_end_pfn(reg)); | |
28be7072 BH |
168 | if (tstart >= tend) |
169 | continue; | |
170 | ret = (*func)(tstart, tend - tstart, arg); | |
9d88a2eb BP |
171 | if (ret) |
172 | break; | |
9d88a2eb BP |
173 | } |
174 | return ret; | |
a99824f3 | 175 | } |
908eedc6 | 176 | EXPORT_SYMBOL_GPL(walk_system_ram_range); |
a99824f3 | 177 | |
7c8c6b97 PM |
178 | /* |
179 | * Initialize the bootmem system and give it all the memory we | |
180 | * have available. If we are using highmem, we only put the | |
181 | * lowmem into the bootmem system. | |
182 | */ | |
183 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
184 | void __init do_init_bootmem(void) | |
185 | { | |
7c8c6b97 PM |
186 | unsigned long start, bootmap_pages; |
187 | unsigned long total_pages; | |
28be7072 | 188 | struct memblock_region *reg; |
7c8c6b97 PM |
189 | int boot_mapsize; |
190 | ||
95f72d1e YL |
191 | max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; |
192 | total_pages = (memblock_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT; | |
7c8c6b97 PM |
193 | #ifdef CONFIG_HIGHMEM |
194 | total_pages = total_lowmem >> PAGE_SHIFT; | |
d7917ba7 | 195 | max_low_pfn = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 PM |
196 | #endif |
197 | ||
198 | /* | |
199 | * Find an area to use for the bootmem bitmap. Calculate the size of | |
200 | * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE. | |
201 | * Add 1 additional page in case the address isn't page-aligned. | |
202 | */ | |
203 | bootmap_pages = bootmem_bootmap_pages(total_pages); | |
204 | ||
95f72d1e | 205 | start = memblock_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE); |
7c8c6b97 | 206 | |
37dd2bad KG |
207 | min_low_pfn = MEMORY_START >> PAGE_SHIFT; |
208 | boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn); | |
7c8c6b97 | 209 | |
4e8309ba CS |
210 | /* Place all memblock_regions in the same node and merge contiguous |
211 | * memblock_regions | |
212 | */ | |
213 | memblock_set_node(0, (phys_addr_t)ULLONG_MAX, 0); | |
c67c3cb4 | 214 | |
7c8c6b97 PM |
215 | /* Add all physical memory to the bootmem map, mark each area |
216 | * present. | |
217 | */ | |
7c8c6b97 | 218 | #ifdef CONFIG_HIGHMEM |
d7917ba7 | 219 | free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT); |
f98eeb4e KG |
220 | |
221 | /* reserve the sections we're already using */ | |
28be7072 BH |
222 | for_each_memblock(reserved, reg) { |
223 | unsigned long top = reg->base + reg->size - 1; | |
224 | if (top < lowmem_end_addr) | |
225 | reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); | |
226 | else if (reg->base < lowmem_end_addr) { | |
227 | unsigned long trunc_size = lowmem_end_addr - reg->base; | |
228 | reserve_bootmem(reg->base, trunc_size, BOOTMEM_DEFAULT); | |
f98eeb4e KG |
229 | } |
230 | } | |
c67c3cb4 MG |
231 | #else |
232 | free_bootmem_with_active_regions(0, max_pfn); | |
7c8c6b97 PM |
233 | |
234 | /* reserve the sections we're already using */ | |
28be7072 BH |
235 | for_each_memblock(reserved, reg) |
236 | reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); | |
f98eeb4e | 237 | #endif |
7c8c6b97 | 238 | /* XXX need to clip this if using highmem? */ |
c67c3cb4 MG |
239 | sparse_memory_present_with_active_regions(0); |
240 | ||
7c8c6b97 PM |
241 | init_bootmem_done = 1; |
242 | } | |
243 | ||
4e8ad3e8 JB |
244 | /* mark pages that don't exist as nosave */ |
245 | static int __init mark_nonram_nosave(void) | |
246 | { | |
28be7072 BH |
247 | struct memblock_region *reg, *prev = NULL; |
248 | ||
249 | for_each_memblock(memory, reg) { | |
250 | if (prev && | |
c7fc2de0 YL |
251 | memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg)) |
252 | register_nosave_region(memblock_region_memory_end_pfn(prev), | |
253 | memblock_region_memory_base_pfn(reg)); | |
28be7072 | 254 | prev = reg; |
4e8ad3e8 | 255 | } |
4e8ad3e8 JB |
256 | return 0; |
257 | } | |
258 | ||
7c8c6b97 PM |
259 | /* |
260 | * paging_init() sets up the page tables - in fact we've already done this. | |
261 | */ | |
262 | void __init paging_init(void) | |
263 | { | |
f7ba2991 | 264 | unsigned long long total_ram = memblock_phys_mem_size(); |
95f72d1e | 265 | phys_addr_t top_of_ram = memblock_end_of_DRAM(); |
c67c3cb4 | 266 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
7c8c6b97 | 267 | |
2c419bde KG |
268 | #ifdef CONFIG_PPC32 |
269 | unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1); | |
270 | unsigned long end = __fix_to_virt(FIX_HOLE); | |
271 | ||
272 | for (; v < end; v += PAGE_SIZE) | |
273 | map_page(v, 0, 0); /* XXX gross */ | |
274 | #endif | |
275 | ||
7c8c6b97 PM |
276 | #ifdef CONFIG_HIGHMEM |
277 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ | |
2c419bde KG |
278 | pkmap_page_table = virt_to_kpte(PKMAP_BASE); |
279 | ||
280 | kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); | |
7c8c6b97 PM |
281 | kmap_prot = PAGE_KERNEL; |
282 | #endif /* CONFIG_HIGHMEM */ | |
283 | ||
f7ba2991 | 284 | printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n", |
fb610635 | 285 | (unsigned long long)top_of_ram, total_ram); |
e110b281 | 286 | printk(KERN_DEBUG "Memory hole size: %ldMB\n", |
2bf3016f | 287 | (long int)((top_of_ram - total_ram) >> 20)); |
6391af17 | 288 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
7c8c6b97 | 289 | #ifdef CONFIG_HIGHMEM |
d7917ba7 | 290 | max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT; |
6391af17 | 291 | max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT; |
7c8c6b97 | 292 | #else |
6391af17 | 293 | max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; |
c67c3cb4 MG |
294 | #endif |
295 | free_area_init_nodes(max_zone_pfns); | |
4e8ad3e8 JB |
296 | |
297 | mark_nonram_nosave(); | |
7c8c6b97 PM |
298 | } |
299 | #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ | |
300 | ||
301 | void __init mem_init(void) | |
302 | { | |
303 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
304 | int nid; | |
305 | #endif | |
306 | pg_data_t *pgdat; | |
307 | unsigned long i; | |
308 | struct page *page; | |
309 | unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize; | |
310 | ||
a9327296 | 311 | #ifdef CONFIG_SWIOTLB |
688ba1db | 312 | swiotlb_init(0); |
a9327296 FT |
313 | #endif |
314 | ||
4734b594 | 315 | num_physpages = memblock_phys_mem_size() >> PAGE_SHIFT; |
7c8c6b97 PM |
316 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
317 | ||
318 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
319 | for_each_online_node(nid) { | |
320 | if (NODE_DATA(nid)->node_spanned_pages != 0) { | |
c258dd40 | 321 | printk("freeing bootmem node %d\n", nid); |
7c8c6b97 PM |
322 | totalram_pages += |
323 | free_all_bootmem_node(NODE_DATA(nid)); | |
324 | } | |
325 | } | |
326 | #else | |
fb6d73d3 | 327 | max_mapnr = max_pfn; |
7c8c6b97 PM |
328 | totalram_pages += free_all_bootmem(); |
329 | #endif | |
ec936fc5 | 330 | for_each_online_pgdat(pgdat) { |
7c8c6b97 | 331 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
fb6d73d3 PM |
332 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
333 | continue; | |
7c8c6b97 PM |
334 | page = pgdat_page_nr(pgdat, i); |
335 | if (PageReserved(page)) | |
336 | reservedpages++; | |
337 | } | |
338 | } | |
339 | ||
340 | codesize = (unsigned long)&_sdata - (unsigned long)&_stext; | |
bcb35576 | 341 | datasize = (unsigned long)&_edata - (unsigned long)&_sdata; |
7c8c6b97 PM |
342 | initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin; |
343 | bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start; | |
344 | ||
345 | #ifdef CONFIG_HIGHMEM | |
346 | { | |
347 | unsigned long pfn, highmem_mapnr; | |
348 | ||
d7917ba7 | 349 | highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT; |
7c8c6b97 | 350 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { |
3d41e0f6 | 351 | phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT; |
7c8c6b97 | 352 | struct page *page = pfn_to_page(pfn); |
3d41e0f6 | 353 | if (memblock_is_reserved(paddr)) |
f98eeb4e | 354 | continue; |
7c8c6b97 | 355 | ClearPageReserved(page); |
7835e98b | 356 | init_page_count(page); |
7c8c6b97 PM |
357 | __free_page(page); |
358 | totalhigh_pages++; | |
f98eeb4e | 359 | reservedpages--; |
7c8c6b97 PM |
360 | } |
361 | totalram_pages += totalhigh_pages; | |
e110b281 | 362 | printk(KERN_DEBUG "High memory: %luk\n", |
7c8c6b97 PM |
363 | totalhigh_pages << (PAGE_SHIFT-10)); |
364 | } | |
365 | #endif /* CONFIG_HIGHMEM */ | |
366 | ||
3160b097 BB |
367 | #if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP) |
368 | /* | |
369 | * If smp is enabled, next_tlbcam_idx is initialized in the cpu up | |
370 | * functions.... do it here for the non-smp case. | |
371 | */ | |
372 | per_cpu(next_tlbcam_idx, smp_processor_id()) = | |
373 | (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1; | |
374 | #endif | |
375 | ||
7c8c6b97 PM |
376 | printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, " |
377 | "%luk reserved, %luk data, %luk bss, %luk init)\n", | |
cc013a88 | 378 | nr_free_pages() << (PAGE_SHIFT-10), |
7c8c6b97 PM |
379 | num_physpages << (PAGE_SHIFT-10), |
380 | codesize >> 10, | |
381 | reservedpages << (PAGE_SHIFT-10), | |
382 | datasize >> 10, | |
383 | bsssize >> 10, | |
384 | initsize >> 10); | |
385 | ||
f637a49e BH |
386 | #ifdef CONFIG_PPC32 |
387 | pr_info("Kernel virtual memory layout:\n"); | |
388 | pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP); | |
389 | #ifdef CONFIG_HIGHMEM | |
390 | pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n", | |
391 | PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP)); | |
392 | #endif /* CONFIG_HIGHMEM */ | |
8b31e49d BH |
393 | #ifdef CONFIG_NOT_COHERENT_CACHE |
394 | pr_info(" * 0x%08lx..0x%08lx : consistent mem\n", | |
395 | IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE); | |
396 | #endif /* CONFIG_NOT_COHERENT_CACHE */ | |
f637a49e BH |
397 | pr_info(" * 0x%08lx..0x%08lx : early ioremap\n", |
398 | ioremap_bot, IOREMAP_TOP); | |
399 | pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n", | |
400 | VMALLOC_START, VMALLOC_END); | |
401 | #endif /* CONFIG_PPC32 */ | |
402 | ||
7c8c6b97 | 403 | mem_init_done = 1; |
7c8c6b97 PM |
404 | } |
405 | ||
2773fcc8 DC |
406 | void free_initmem(void) |
407 | { | |
408 | unsigned long addr; | |
409 | ||
a9c0f41b | 410 | ppc_md.progress = ppc_printk_progress; |
2773fcc8 DC |
411 | |
412 | addr = (unsigned long)__init_begin; | |
413 | for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) { | |
414 | memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); | |
415 | ClearPageReserved(virt_to_page(addr)); | |
416 | init_page_count(virt_to_page(addr)); | |
417 | free_page(addr); | |
418 | totalram_pages++; | |
419 | } | |
420 | pr_info("Freeing unused kernel memory: %luk freed\n", | |
421 | ((unsigned long)__init_end - | |
422 | (unsigned long)__init_begin) >> 10); | |
423 | } | |
424 | ||
307cfe71 BH |
425 | #ifdef CONFIG_BLK_DEV_INITRD |
426 | void __init free_initrd_mem(unsigned long start, unsigned long end) | |
427 | { | |
428 | if (start >= end) | |
429 | return; | |
430 | ||
431 | start = _ALIGN_DOWN(start, PAGE_SIZE); | |
432 | end = _ALIGN_UP(end, PAGE_SIZE); | |
433 | pr_info("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
434 | ||
435 | for (; start < end; start += PAGE_SIZE) { | |
436 | ClearPageReserved(virt_to_page(start)); | |
437 | init_page_count(virt_to_page(start)); | |
438 | free_page(start); | |
439 | totalram_pages++; | |
440 | } | |
441 | } | |
442 | #endif | |
443 | ||
14cf11af PM |
444 | /* |
445 | * This is called when a page has been modified by the kernel. | |
446 | * It just marks the page as not i-cache clean. We do the i-cache | |
447 | * flush later when the page is given to a user process, if necessary. | |
448 | */ | |
449 | void flush_dcache_page(struct page *page) | |
450 | { | |
451 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
452 | return; | |
453 | /* avoid an atomic op if possible */ | |
454 | if (test_bit(PG_arch_1, &page->flags)) | |
455 | clear_bit(PG_arch_1, &page->flags); | |
456 | } | |
457 | EXPORT_SYMBOL(flush_dcache_page); | |
458 | ||
459 | void flush_dcache_icache_page(struct page *page) | |
460 | { | |
0895ecda DG |
461 | #ifdef CONFIG_HUGETLB_PAGE |
462 | if (PageCompound(page)) { | |
463 | flush_dcache_icache_hugepage(page); | |
464 | return; | |
465 | } | |
466 | #endif | |
14cf11af | 467 | #ifdef CONFIG_BOOKE |
0895ecda | 468 | { |
2480b208 | 469 | void *start = kmap_atomic(page); |
0895ecda | 470 | __flush_dcache_icache(start); |
2480b208 | 471 | kunmap_atomic(start); |
0895ecda | 472 | } |
ab1f9dac | 473 | #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) |
14cf11af PM |
474 | /* On 8xx there is no need to kmap since highmem is not supported */ |
475 | __flush_dcache_icache(page_address(page)); | |
476 | #else | |
477 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); | |
478 | #endif | |
14cf11af | 479 | } |
249ba1ee | 480 | EXPORT_SYMBOL(flush_dcache_icache_page); |
0895ecda | 481 | |
14cf11af PM |
482 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) |
483 | { | |
484 | clear_page(page); | |
485 | ||
14cf11af | 486 | /* |
25985edc | 487 | * We shouldn't have to do this, but some versions of glibc |
14cf11af PM |
488 | * require it (ld.so assumes zero filled pages are icache clean) |
489 | * - Anton | |
490 | */ | |
09f5dc44 | 491 | flush_dcache_page(pg); |
14cf11af PM |
492 | } |
493 | EXPORT_SYMBOL(clear_user_page); | |
494 | ||
495 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
496 | struct page *pg) | |
497 | { | |
498 | copy_page(vto, vfrom); | |
499 | ||
500 | /* | |
501 | * We should be able to use the following optimisation, however | |
502 | * there are two problems. | |
503 | * Firstly a bug in some versions of binutils meant PLT sections | |
504 | * were not marked executable. | |
505 | * Secondly the first word in the GOT section is blrl, used | |
506 | * to establish the GOT address. Until recently the GOT was | |
507 | * not marked executable. | |
508 | * - Anton | |
509 | */ | |
510 | #if 0 | |
511 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) | |
512 | return; | |
513 | #endif | |
514 | ||
09f5dc44 | 515 | flush_dcache_page(pg); |
14cf11af PM |
516 | } |
517 | ||
518 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
519 | unsigned long addr, int len) | |
520 | { | |
521 | unsigned long maddr; | |
522 | ||
523 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); | |
524 | flush_icache_range(maddr, maddr + len); | |
525 | kunmap(page); | |
526 | } | |
527 | EXPORT_SYMBOL(flush_icache_user_range); | |
528 | ||
529 | /* | |
530 | * This is called at the end of handling a user page fault, when the | |
531 | * fault has been handled by updating a PTE in the linux page tables. | |
532 | * We use it to preload an HPTE into the hash table corresponding to | |
533 | * the updated linux PTE. | |
534 | * | |
01edcd89 | 535 | * This must always be called with the pte lock held. |
14cf11af PM |
536 | */ |
537 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, | |
4b3073e1 | 538 | pte_t *ptep) |
14cf11af | 539 | { |
3c726f8d BH |
540 | #ifdef CONFIG_PPC_STD_MMU |
541 | unsigned long access = 0, trap; | |
14cf11af | 542 | |
14cf11af | 543 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ |
4b3073e1 | 544 | if (!pte_young(*ptep) || address >= TASK_SIZE) |
14cf11af | 545 | return; |
14cf11af | 546 | |
3c726f8d BH |
547 | /* We try to figure out if we are coming from an instruction |
548 | * access fault and pass that down to __hash_page so we avoid | |
549 | * double-faulting on execution of fresh text. We have to test | |
550 | * for regs NULL since init will get here first thing at boot | |
551 | * | |
552 | * We also avoid filling the hash if not coming from a fault | |
553 | */ | |
554 | if (current->thread.regs == NULL) | |
14cf11af | 555 | return; |
3c726f8d BH |
556 | trap = TRAP(current->thread.regs); |
557 | if (trap == 0x400) | |
558 | access |= _PAGE_EXEC; | |
559 | else if (trap != 0x300) | |
560 | return; | |
561 | hash_preload(vma->vm_mm, address, access, trap); | |
562 | #endif /* CONFIG_PPC_STD_MMU */ | |
41151e77 BB |
563 | #if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \ |
564 | && defined(CONFIG_HUGETLB_PAGE) | |
565 | if (is_vm_hugetlb_page(vma)) | |
d93e4d7d | 566 | book3e_hugetlb_preload(vma, address, *ptep); |
41151e77 | 567 | #endif |
14cf11af | 568 | } |
c40dd2f7 AB |
569 | |
570 | /* | |
571 | * System memory should not be in /proc/iomem but various tools expect it | |
572 | * (eg kdump). | |
573 | */ | |
574 | static int add_system_ram_resources(void) | |
575 | { | |
576 | struct memblock_region *reg; | |
577 | ||
578 | for_each_memblock(memory, reg) { | |
579 | struct resource *res; | |
580 | unsigned long base = reg->base; | |
581 | unsigned long size = reg->size; | |
582 | ||
583 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
584 | WARN_ON(!res); | |
585 | ||
586 | if (res) { | |
587 | res->name = "System RAM"; | |
588 | res->start = base; | |
589 | res->end = base + size - 1; | |
590 | res->flags = IORESOURCE_MEM; | |
591 | WARN_ON(request_resource(&iomem_resource, res) < 0); | |
592 | } | |
593 | } | |
594 | ||
595 | return 0; | |
596 | } | |
597 | subsys_initcall(add_system_ram_resources); | |
1d54cf2b | 598 | |
599 | #ifdef CONFIG_STRICT_DEVMEM | |
600 | /* | |
601 | * devmem_is_allowed(): check to see if /dev/mem access to a certain address | |
602 | * is valid. The argument is a physical page number. | |
603 | * | |
604 | * Access has to be given to non-kernel-ram areas as well, these contain the | |
605 | * PCI mmio resources as well as potential bios/acpi data regions. | |
606 | */ | |
607 | int devmem_is_allowed(unsigned long pfn) | |
608 | { | |
609 | if (iomem_is_exclusive(pfn << PAGE_SHIFT)) | |
610 | return 0; | |
611 | if (!page_is_ram(pfn)) | |
612 | return 1; | |
8a3e3d31 | 613 | if (page_is_rtas_user_buf(pfn)) |
614 | return 1; | |
1d54cf2b | 615 | return 0; |
616 | } | |
617 | #endif /* CONFIG_STRICT_DEVMEM */ |