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10#include <linux/module.h>
11#include <linux/mm.h>
12#include <linux/pagemap.h>
13
14#include <asm/cacheflush.h>
15#include <asm/cachetype.h>
16#include <asm/system.h>
17#include <asm/tlbflush.h>
18
19#include "mm.h"
20
21#ifdef CONFIG_CPU_CACHE_VIPT
22
23#define ALIAS_FLUSH_START 0xffff4000
24
25static void flush_pfn_alias(unsigned long pfn, unsigned long vaddr)
26{
27 unsigned long to = ALIAS_FLUSH_START + (CACHE_COLOUR(vaddr) << PAGE_SHIFT);
28 const int zero = 0;
29
30 set_pte_ext(TOP_PTE(to), pfn_pte(pfn, PAGE_KERNEL), 0);
31 flush_tlb_kernel_page(to);
32
33 asm( "mcrr p15, 0, %1, %0, c14\n"
34 " mcr p15, 0, %2, c7, c10, 4"
35 :
36 : "r" (to), "r" (to + PAGE_SIZE - L1_CACHE_BYTES), "r" (zero)
37 : "cc");
38 __flush_icache_all();
39}
40
41void flush_cache_mm(struct mm_struct *mm)
42{
43 if (cache_is_vivt()) {
44 if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(mm)))
45 __cpuc_flush_user_all();
46 return;
47 }
48
49 if (cache_is_vipt_aliasing()) {
50 asm( "mcr p15, 0, %0, c7, c14, 0\n"
51 " mcr p15, 0, %0, c7, c10, 4"
52 :
53 : "r" (0)
54 : "cc");
55 __flush_icache_all();
56 }
57}
58
59void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
60{
61 if (cache_is_vivt()) {
62 if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma->vm_mm)))
63 __cpuc_flush_user_range(start & PAGE_MASK, PAGE_ALIGN(end),
64 vma->vm_flags);
65 return;
66 }
67
68 if (cache_is_vipt_aliasing()) {
69 asm( "mcr p15, 0, %0, c7, c14, 0\n"
70 " mcr p15, 0, %0, c7, c10, 4"
71 :
72 : "r" (0)
73 : "cc");
74 __flush_icache_all();
75 }
76}
77
78void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn)
79{
80 if (cache_is_vivt()) {
81 if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma->vm_mm))) {
82 unsigned long addr = user_addr & PAGE_MASK;
83 __cpuc_flush_user_range(addr, addr + PAGE_SIZE, vma->vm_flags);
84 }
85 return;
86 }
87
88 if (cache_is_vipt_aliasing())
89 flush_pfn_alias(pfn, user_addr);
90}
91
92void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
93 unsigned long uaddr, void *kaddr,
94 unsigned long len, int write)
95{
96 if (cache_is_vivt()) {
97 if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma->vm_mm))) {
98 unsigned long addr = (unsigned long)kaddr;
99 __cpuc_coherent_kern_range(addr, addr + len);
100 }
101 return;
102 }
103
104 if (cache_is_vipt_aliasing()) {
105 flush_pfn_alias(page_to_pfn(page), uaddr);
106 return;
107 }
108
109
110 if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma->vm_mm)) &&
111 vma->vm_flags & VM_EXEC) {
112 unsigned long addr = (unsigned long)kaddr;
113
114 __cpuc_coherent_kern_range(addr, addr + len);
115 }
116}
117#else
118#define flush_pfn_alias(pfn,vaddr) do { } while (0)
119#endif
120
121void __flush_dcache_page(struct address_space *mapping, struct page *page)
122{
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127
128#ifdef CONFIG_HIGHMEM
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133 if (page_address(page))
134#endif
135 __cpuc_flush_dcache_page(page_address(page));
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142 if (mapping && cache_is_vipt_aliasing())
143 flush_pfn_alias(page_to_pfn(page),
144 page->index << PAGE_CACHE_SHIFT);
145}
146
147static void __flush_dcache_aliases(struct address_space *mapping, struct page *page)
148{
149 struct mm_struct *mm = current->active_mm;
150 struct vm_area_struct *mpnt;
151 struct prio_tree_iter iter;
152 pgoff_t pgoff;
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160 pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
161
162 flush_dcache_mmap_lock(mapping);
163 vma_prio_tree_foreach(mpnt, &iter, &mapping->i_mmap, pgoff, pgoff) {
164 unsigned long offset;
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168
169 if (mpnt->vm_mm != mm)
170 continue;
171 if (!(mpnt->vm_flags & VM_MAYSHARE))
172 continue;
173 offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
174 flush_cache_page(mpnt, mpnt->vm_start + offset, page_to_pfn(page));
175 }
176 flush_dcache_mmap_unlock(mapping);
177}
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196
197void flush_dcache_page(struct page *page)
198{
199 struct address_space *mapping = page_mapping(page);
200
201#ifndef CONFIG_SMP
202 if (!PageHighMem(page) && mapping && !mapping_mapped(mapping))
203 set_bit(PG_dcache_dirty, &page->flags);
204 else
205#endif
206 {
207 __flush_dcache_page(mapping, page);
208 if (mapping && cache_is_vivt())
209 __flush_dcache_aliases(mapping, page);
210 else if (mapping)
211 __flush_icache_all();
212 }
213}
214EXPORT_SYMBOL(flush_dcache_page);
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224
225void __flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr)
226{
227 unsigned long pfn;
228
229
230 if (cache_is_vipt_nonaliasing())
231 return;
232
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236 pfn = page_to_pfn(page);
237 if (cache_is_vivt()) {
238 flush_cache_page(vma, vmaddr, pfn);
239 } else {
240
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244 flush_pfn_alias(pfn, vmaddr);
245 }
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252 __cpuc_flush_dcache_page(page_address(page));
253}
254