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10#include <linux/module.h>
11#include <linux/mm.h>
12#include <linux/pagemap.h>
13#include <linux/highmem.h>
14
15#include <asm/cacheflush.h>
16#include <asm/cachetype.h>
17#include <asm/highmem.h>
18#include <asm/smp_plat.h>
19#include <asm/system.h>
20#include <asm/tlbflush.h>
21
22#include "mm.h"
23
24#ifdef CONFIG_CPU_CACHE_VIPT
25
26#define ALIAS_FLUSH_START 0xffff4000
27
28static void flush_pfn_alias(unsigned long pfn, unsigned long vaddr)
29{
30 unsigned long to = ALIAS_FLUSH_START + (CACHE_COLOUR(vaddr) << PAGE_SHIFT);
31 const int zero = 0;
32
33 set_pte_ext(TOP_PTE(to), pfn_pte(pfn, PAGE_KERNEL), 0);
34 flush_tlb_kernel_page(to);
35
36 asm( "mcrr p15, 0, %1, %0, c14\n"
37 " mcr p15, 0, %2, c7, c10, 4"
38 :
39 : "r" (to), "r" (to + PAGE_SIZE - L1_CACHE_BYTES), "r" (zero)
40 : "cc");
41}
42
43static void flush_icache_alias(unsigned long pfn, unsigned long vaddr, unsigned long len)
44{
45 unsigned long colour = CACHE_COLOUR(vaddr);
46 unsigned long offset = vaddr & (PAGE_SIZE - 1);
47 unsigned long to;
48
49 set_pte_ext(TOP_PTE(ALIAS_FLUSH_START) + colour, pfn_pte(pfn, PAGE_KERNEL), 0);
50 to = ALIAS_FLUSH_START + (colour << PAGE_SHIFT) + offset;
51 flush_tlb_kernel_page(to);
52 flush_icache_range(to, to + len);
53}
54
55void flush_cache_mm(struct mm_struct *mm)
56{
57 if (cache_is_vivt()) {
58 vivt_flush_cache_mm(mm);
59 return;
60 }
61
62 if (cache_is_vipt_aliasing()) {
63 asm( "mcr p15, 0, %0, c7, c14, 0\n"
64 " mcr p15, 0, %0, c7, c10, 4"
65 :
66 : "r" (0)
67 : "cc");
68 }
69}
70
71void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
72{
73 if (cache_is_vivt()) {
74 vivt_flush_cache_range(vma, start, end);
75 return;
76 }
77
78 if (cache_is_vipt_aliasing()) {
79 asm( "mcr p15, 0, %0, c7, c14, 0\n"
80 " mcr p15, 0, %0, c7, c10, 4"
81 :
82 : "r" (0)
83 : "cc");
84 }
85
86 if (vma->vm_flags & VM_EXEC)
87 __flush_icache_all();
88}
89
90void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn)
91{
92 if (cache_is_vivt()) {
93 vivt_flush_cache_page(vma, user_addr, pfn);
94 return;
95 }
96
97 if (cache_is_vipt_aliasing()) {
98 flush_pfn_alias(pfn, user_addr);
99 __flush_icache_all();
100 }
101
102 if (vma->vm_flags & VM_EXEC && icache_is_vivt_asid_tagged())
103 __flush_icache_all();
104}
105
106#else
107#define flush_pfn_alias(pfn,vaddr) do { } while (0)
108#define flush_icache_alias(pfn,vaddr,len) do { } while (0)
109#endif
110
111static void flush_ptrace_access_other(void *args)
112{
113 __flush_icache_all();
114}
115
116static
117void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
118 unsigned long uaddr, void *kaddr, unsigned long len)
119{
120 if (cache_is_vivt()) {
121 if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma->vm_mm))) {
122 unsigned long addr = (unsigned long)kaddr;
123 __cpuc_coherent_kern_range(addr, addr + len);
124 }
125 return;
126 }
127
128 if (cache_is_vipt_aliasing()) {
129 flush_pfn_alias(page_to_pfn(page), uaddr);
130 __flush_icache_all();
131 return;
132 }
133
134
135 if (vma->vm_flags & VM_EXEC) {
136 unsigned long addr = (unsigned long)kaddr;
137 if (icache_is_vipt_aliasing())
138 flush_icache_alias(page_to_pfn(page), uaddr, len);
139 else
140 __cpuc_coherent_kern_range(addr, addr + len);
141 if (cache_ops_need_broadcast())
142 smp_call_function(flush_ptrace_access_other,
143 NULL, 1);
144 }
145}
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153
154void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
155 unsigned long uaddr, void *dst, const void *src,
156 unsigned long len)
157{
158#ifdef CONFIG_SMP
159 preempt_disable();
160#endif
161 memcpy(dst, src, len);
162 flush_ptrace_access(vma, page, uaddr, dst, len);
163#ifdef CONFIG_SMP
164 preempt_enable();
165#endif
166}
167
168void __flush_dcache_page(struct address_space *mapping, struct page *page)
169{
170
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174
175 if (!PageHighMem(page)) {
176 __cpuc_flush_dcache_area(page_address(page), PAGE_SIZE);
177 } else {
178 void *addr = kmap_high_get(page);
179 if (addr) {
180 __cpuc_flush_dcache_area(addr, PAGE_SIZE);
181 kunmap_high(page);
182 } else if (cache_is_vipt()) {
183
184 addr = kmap_atomic(page);
185 __cpuc_flush_dcache_area(addr, PAGE_SIZE);
186 kunmap_atomic(addr);
187 }
188 }
189
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193
194
195 if (mapping && cache_is_vipt_aliasing())
196 flush_pfn_alias(page_to_pfn(page),
197 page->index << PAGE_CACHE_SHIFT);
198}
199
200static void __flush_dcache_aliases(struct address_space *mapping, struct page *page)
201{
202 struct mm_struct *mm = current->active_mm;
203 struct vm_area_struct *mpnt;
204 struct prio_tree_iter iter;
205 pgoff_t pgoff;
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212
213 pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
214
215 flush_dcache_mmap_lock(mapping);
216 vma_prio_tree_foreach(mpnt, &iter, &mapping->i_mmap, pgoff, pgoff) {
217 unsigned long offset;
218
219
220
221
222 if (mpnt->vm_mm != mm)
223 continue;
224 if (!(mpnt->vm_flags & VM_MAYSHARE))
225 continue;
226 offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
227 flush_cache_page(mpnt, mpnt->vm_start + offset, page_to_pfn(page));
228 }
229 flush_dcache_mmap_unlock(mapping);
230}
231
232#if __LINUX_ARM_ARCH__ >= 6
233void __sync_icache_dcache(pte_t pteval)
234{
235 unsigned long pfn;
236 struct page *page;
237 struct address_space *mapping;
238
239 if (!pte_present_user(pteval))
240 return;
241 if (cache_is_vipt_nonaliasing() && !pte_exec(pteval))
242
243 return;
244 pfn = pte_pfn(pteval);
245 if (!pfn_valid(pfn))
246 return;
247
248 page = pfn_to_page(pfn);
249 if (cache_is_vipt_aliasing())
250 mapping = page_mapping(page);
251 else
252 mapping = NULL;
253
254 if (!test_and_set_bit(PG_dcache_clean, &page->flags))
255 __flush_dcache_page(mapping, page);
256
257 if (cache_is_vipt_nonaliasing() || pte_exec(pteval))
258 __flush_icache_all();
259}
260#endif
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280void flush_dcache_page(struct page *page)
281{
282 struct address_space *mapping;
283
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287
288 if (page == ZERO_PAGE(0))
289 return;
290
291 mapping = page_mapping(page);
292
293 if (!cache_ops_need_broadcast() &&
294 mapping && !mapping_mapped(mapping))
295 clear_bit(PG_dcache_clean, &page->flags);
296 else {
297 __flush_dcache_page(mapping, page);
298 if (mapping && cache_is_vivt())
299 __flush_dcache_aliases(mapping, page);
300 else if (mapping)
301 __flush_icache_all();
302 set_bit(PG_dcache_clean, &page->flags);
303 }
304}
305EXPORT_SYMBOL(flush_dcache_page);
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316void __flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr)
317{
318 unsigned long pfn;
319
320
321 if (cache_is_vipt_nonaliasing())
322 return;
323
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326
327 pfn = page_to_pfn(page);
328 if (cache_is_vivt()) {
329 flush_cache_page(vma, vmaddr, pfn);
330 } else {
331
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335 flush_pfn_alias(pfn, vmaddr);
336 __flush_icache_all();
337 }
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344 __cpuc_flush_dcache_area(page_address(page), PAGE_SIZE);
345}
346