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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 | * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk). | |
9 | * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com) | |
10 | * | |
11 | * Derived from "arch/i386/mm/init.c" | |
12 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | */ | |
20 | ||
21 | #include <linux/config.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/sched.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/string.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/stddef.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/bootmem.h> | |
32 | #include <linux/highmem.h> | |
33 | #include <linux/initrd.h> | |
34 | #include <linux/pagemap.h> | |
35 | ||
36 | #include <asm/pgalloc.h> | |
37 | #include <asm/prom.h> | |
38 | #include <asm/io.h> | |
39 | #include <asm/mmu_context.h> | |
40 | #include <asm/pgtable.h> | |
41 | #include <asm/mmu.h> | |
42 | #include <asm/smp.h> | |
43 | #include <asm/machdep.h> | |
44 | #include <asm/btext.h> | |
45 | #include <asm/tlb.h> | |
46 | #include <asm/bootinfo.h> | |
47 | #include <asm/prom.h> | |
48 | ||
49 | #include "mem_pieces.h" | |
50 | #include "mmu_decl.h" | |
51 | ||
52 | #ifndef CPU_FTR_COHERENT_ICACHE | |
53 | #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */ | |
54 | #define CPU_FTR_NOEXECUTE 0 | |
55 | #endif | |
56 | ||
57 | /* | |
58 | * This is called by /dev/mem to know if a given address has to | |
59 | * be mapped non-cacheable or not | |
60 | */ | |
61 | int page_is_ram(unsigned long pfn) | |
62 | { | |
63 | unsigned long paddr = (pfn << PAGE_SHIFT); | |
64 | ||
65 | #ifndef CONFIG_PPC64 /* XXX for now */ | |
66 | return paddr < __pa(high_memory); | |
67 | #else | |
68 | int i; | |
69 | for (i=0; i < lmb.memory.cnt; i++) { | |
70 | unsigned long base; | |
71 | ||
72 | base = lmb.memory.region[i].base; | |
73 | ||
74 | if ((paddr >= base) && | |
75 | (paddr < (base + lmb.memory.region[i].size))) { | |
76 | return 1; | |
77 | } | |
78 | } | |
79 | ||
80 | return 0; | |
81 | #endif | |
82 | } | |
83 | EXPORT_SYMBOL(page_is_ram); | |
84 | ||
85 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long addr, | |
86 | unsigned long size, pgprot_t vma_prot) | |
87 | { | |
88 | if (ppc_md.phys_mem_access_prot) | |
89 | return ppc_md.phys_mem_access_prot(file, addr, size, vma_prot); | |
90 | ||
91 | if (!page_is_ram(addr >> PAGE_SHIFT)) | |
92 | vma_prot = __pgprot(pgprot_val(vma_prot) | |
93 | | _PAGE_GUARDED | _PAGE_NO_CACHE); | |
94 | return vma_prot; | |
95 | } | |
96 | EXPORT_SYMBOL(phys_mem_access_prot); | |
97 | ||
98 | void show_mem(void) | |
99 | { | |
100 | unsigned long total = 0, reserved = 0; | |
101 | unsigned long shared = 0, cached = 0; | |
102 | unsigned long highmem = 0; | |
103 | struct page *page; | |
104 | pg_data_t *pgdat; | |
105 | unsigned long i; | |
106 | ||
107 | printk("Mem-info:\n"); | |
108 | show_free_areas(); | |
109 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
110 | for_each_pgdat(pgdat) { | |
111 | for (i = 0; i < pgdat->node_spanned_pages; i++) { | |
112 | page = pgdat_page_nr(pgdat, i); | |
113 | total++; | |
114 | if (PageHighMem(page)) | |
115 | highmem++; | |
116 | if (PageReserved(page)) | |
117 | reserved++; | |
118 | else if (PageSwapCache(page)) | |
119 | cached++; | |
120 | else if (page_count(page)) | |
121 | shared += page_count(page) - 1; | |
122 | } | |
123 | } | |
124 | printk("%ld pages of RAM\n", total); | |
125 | #ifdef CONFIG_HIGHMEM | |
126 | printk("%ld pages of HIGHMEM\n", highmem); | |
127 | #endif | |
128 | printk("%ld reserved pages\n", reserved); | |
129 | printk("%ld pages shared\n", shared); | |
130 | printk("%ld pages swap cached\n", cached); | |
131 | } | |
132 | ||
133 | /* | |
134 | * This is called when a page has been modified by the kernel. | |
135 | * It just marks the page as not i-cache clean. We do the i-cache | |
136 | * flush later when the page is given to a user process, if necessary. | |
137 | */ | |
138 | void flush_dcache_page(struct page *page) | |
139 | { | |
140 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
141 | return; | |
142 | /* avoid an atomic op if possible */ | |
143 | if (test_bit(PG_arch_1, &page->flags)) | |
144 | clear_bit(PG_arch_1, &page->flags); | |
145 | } | |
146 | EXPORT_SYMBOL(flush_dcache_page); | |
147 | ||
148 | void flush_dcache_icache_page(struct page *page) | |
149 | { | |
150 | #ifdef CONFIG_BOOKE | |
151 | void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE); | |
152 | __flush_dcache_icache(start); | |
153 | kunmap_atomic(start, KM_PPC_SYNC_ICACHE); | |
154 | #elif defined(CONFIG_8xx) | |
155 | /* On 8xx there is no need to kmap since highmem is not supported */ | |
156 | __flush_dcache_icache(page_address(page)); | |
157 | #else | |
158 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); | |
159 | #endif | |
160 | ||
161 | } | |
162 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) | |
163 | { | |
164 | clear_page(page); | |
165 | ||
166 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
167 | return; | |
168 | /* | |
169 | * We shouldnt have to do this, but some versions of glibc | |
170 | * require it (ld.so assumes zero filled pages are icache clean) | |
171 | * - Anton | |
172 | */ | |
173 | ||
174 | /* avoid an atomic op if possible */ | |
175 | if (test_bit(PG_arch_1, &pg->flags)) | |
176 | clear_bit(PG_arch_1, &pg->flags); | |
177 | } | |
178 | EXPORT_SYMBOL(clear_user_page); | |
179 | ||
180 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
181 | struct page *pg) | |
182 | { | |
183 | copy_page(vto, vfrom); | |
184 | ||
185 | /* | |
186 | * We should be able to use the following optimisation, however | |
187 | * there are two problems. | |
188 | * Firstly a bug in some versions of binutils meant PLT sections | |
189 | * were not marked executable. | |
190 | * Secondly the first word in the GOT section is blrl, used | |
191 | * to establish the GOT address. Until recently the GOT was | |
192 | * not marked executable. | |
193 | * - Anton | |
194 | */ | |
195 | #if 0 | |
196 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) | |
197 | return; | |
198 | #endif | |
199 | ||
200 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
201 | return; | |
202 | ||
203 | /* avoid an atomic op if possible */ | |
204 | if (test_bit(PG_arch_1, &pg->flags)) | |
205 | clear_bit(PG_arch_1, &pg->flags); | |
206 | } | |
207 | ||
208 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
209 | unsigned long addr, int len) | |
210 | { | |
211 | unsigned long maddr; | |
212 | ||
213 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); | |
214 | flush_icache_range(maddr, maddr + len); | |
215 | kunmap(page); | |
216 | } | |
217 | EXPORT_SYMBOL(flush_icache_user_range); | |
218 | ||
219 | /* | |
220 | * This is called at the end of handling a user page fault, when the | |
221 | * fault has been handled by updating a PTE in the linux page tables. | |
222 | * We use it to preload an HPTE into the hash table corresponding to | |
223 | * the updated linux PTE. | |
224 | * | |
225 | * This must always be called with the mm->page_table_lock held | |
226 | */ | |
227 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, | |
228 | pte_t pte) | |
229 | { | |
230 | /* handle i-cache coherency */ | |
231 | unsigned long pfn = pte_pfn(pte); | |
232 | #ifdef CONFIG_PPC32 | |
233 | pmd_t *pmd; | |
234 | #else | |
235 | unsigned long vsid; | |
236 | void *pgdir; | |
237 | pte_t *ptep; | |
238 | int local = 0; | |
239 | cpumask_t tmp; | |
240 | unsigned long flags; | |
241 | #endif | |
242 | ||
243 | /* handle i-cache coherency */ | |
244 | if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) && | |
245 | !cpu_has_feature(CPU_FTR_NOEXECUTE) && | |
246 | pfn_valid(pfn)) { | |
247 | struct page *page = pfn_to_page(pfn); | |
248 | if (!PageReserved(page) | |
249 | && !test_bit(PG_arch_1, &page->flags)) { | |
250 | if (vma->vm_mm == current->active_mm) { | |
251 | #ifdef CONFIG_8xx | |
252 | /* On 8xx, cache control instructions (particularly | |
253 | * "dcbst" from flush_dcache_icache) fault as write | |
254 | * operation if there is an unpopulated TLB entry | |
255 | * for the address in question. To workaround that, | |
256 | * we invalidate the TLB here, thus avoiding dcbst | |
257 | * misbehaviour. | |
258 | */ | |
259 | _tlbie(address); | |
260 | #endif | |
261 | __flush_dcache_icache((void *) address); | |
262 | } else | |
263 | flush_dcache_icache_page(page); | |
264 | set_bit(PG_arch_1, &page->flags); | |
265 | } | |
266 | } | |
267 | ||
268 | #ifdef CONFIG_PPC_STD_MMU | |
269 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ | |
270 | if (!pte_young(pte) || address >= TASK_SIZE) | |
271 | return; | |
272 | #ifdef CONFIG_PPC32 | |
273 | if (Hash == 0) | |
274 | return; | |
275 | pmd = pmd_offset(pgd_offset(vma->vm_mm, address), address); | |
276 | if (!pmd_none(*pmd)) | |
277 | add_hash_page(vma->vm_mm->context, address, pmd_val(*pmd)); | |
278 | #else | |
279 | pgdir = vma->vm_mm->pgd; | |
280 | if (pgdir == NULL) | |
281 | return; | |
282 | ||
283 | ptep = find_linux_pte(pgdir, ea); | |
284 | if (!ptep) | |
285 | return; | |
286 | ||
287 | vsid = get_vsid(vma->vm_mm->context.id, ea); | |
288 | ||
289 | local_irq_save(flags); | |
290 | tmp = cpumask_of_cpu(smp_processor_id()); | |
291 | if (cpus_equal(vma->vm_mm->cpu_vm_mask, tmp)) | |
292 | local = 1; | |
293 | ||
294 | __hash_page(ea, pte_val(pte) & (_PAGE_USER|_PAGE_RW), vsid, ptep, | |
295 | 0x300, local); | |
296 | local_irq_restore(flags); | |
297 | #endif | |
298 | #endif | |
299 | } |