2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2009, Wind River Systems Inc
7 * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
10 #include <linux/export.h>
11 #include <linux/sched.h>
15 #include <asm/cacheflush.h>
16 #include <asm/cpuinfo.h>
18 static void __flush_dcache(unsigned long start, unsigned long end)
22 start &= ~(cpuinfo.dcache_line_size - 1);
23 end += (cpuinfo.dcache_line_size - 1);
24 end &= ~(cpuinfo.dcache_line_size - 1);
26 if (end > start + cpuinfo.dcache_size)
27 end = start + cpuinfo.dcache_size;
29 for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {
30 __asm__ __volatile__ (" flushda 0(%0)\n"
32 : /* Inputs */ "r"(addr)
37 static void __flush_dcache_all(unsigned long start, unsigned long end)
41 start &= ~(cpuinfo.dcache_line_size - 1);
42 end += (cpuinfo.dcache_line_size - 1);
43 end &= ~(cpuinfo.dcache_line_size - 1);
45 if (end > start + cpuinfo.dcache_size)
46 end = start + cpuinfo.dcache_size;
48 for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {
49 __asm__ __volatile__ (" flushd 0(%0)\n"
51 : /* Inputs */ "r"(addr)
56 static void __invalidate_dcache(unsigned long start, unsigned long end)
60 start &= ~(cpuinfo.dcache_line_size - 1);
61 end += (cpuinfo.dcache_line_size - 1);
62 end &= ~(cpuinfo.dcache_line_size - 1);
64 if (end > start + cpuinfo.dcache_size)
65 end = start + cpuinfo.dcache_size;
67 for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {
68 __asm__ __volatile__ (" initda 0(%0)\n"
70 : /* Inputs */ "r"(addr)
75 static void __flush_icache(unsigned long start, unsigned long end)
79 start &= ~(cpuinfo.icache_line_size - 1);
80 end += (cpuinfo.icache_line_size - 1);
81 end &= ~(cpuinfo.icache_line_size - 1);
83 if (end > start + cpuinfo.icache_size)
84 end = start + cpuinfo.icache_size;
86 for (addr = start; addr < end; addr += cpuinfo.icache_line_size) {
87 __asm__ __volatile__ (" flushi %0\n"
89 : /* Inputs */ "r"(addr)
92 __asm__ __volatile(" flushp\n");
95 static void flush_aliases(struct address_space *mapping, struct page *page)
97 struct mm_struct *mm = current->active_mm;
98 struct vm_area_struct *mpnt;
103 flush_dcache_mmap_lock(mapping);
104 vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) {
105 unsigned long offset;
107 if (mpnt->vm_mm != mm)
109 if (!(mpnt->vm_flags & VM_MAYSHARE))
112 offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
113 flush_cache_page(mpnt, mpnt->vm_start + offset,
116 flush_dcache_mmap_unlock(mapping);
119 void flush_cache_all(void)
121 __flush_dcache_all(0, cpuinfo.dcache_size);
122 __flush_icache(0, cpuinfo.icache_size);
125 void flush_cache_mm(struct mm_struct *mm)
130 void flush_cache_dup_mm(struct mm_struct *mm)
135 void flush_icache_range(unsigned long start, unsigned long end)
137 __flush_icache(start, end);
140 void flush_dcache_range(unsigned long start, unsigned long end)
142 __flush_dcache(start, end);
144 EXPORT_SYMBOL(flush_dcache_range);
146 void invalidate_dcache_range(unsigned long start, unsigned long end)
148 __invalidate_dcache(start, end);
150 EXPORT_SYMBOL(invalidate_dcache_range);
152 void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
155 __flush_dcache(start, end);
156 if (vma == NULL || (vma->vm_flags & VM_EXEC))
157 __flush_icache(start, end);
160 void flush_icache_page(struct vm_area_struct *vma, struct page *page)
162 unsigned long start = (unsigned long) page_address(page);
163 unsigned long end = start + PAGE_SIZE;
165 __flush_icache(start, end);
168 void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr,
171 unsigned long start = vmaddr;
172 unsigned long end = start + PAGE_SIZE;
174 __flush_dcache(start, end);
175 if (vma->vm_flags & VM_EXEC)
176 __flush_icache(start, end);
179 void flush_dcache_page(struct page *page)
181 struct address_space *mapping;
184 * The zero page is never written to, so never has any dirty
185 * cache lines, and therefore never needs to be flushed.
187 if (page == ZERO_PAGE(0))
190 mapping = page_mapping(page);
192 /* Flush this page if there are aliases. */
193 if (mapping && !mapping_mapped(mapping)) {
194 clear_bit(PG_dcache_clean, &page->flags);
196 unsigned long start = (unsigned long)page_address(page);
198 __flush_dcache_all(start, start + PAGE_SIZE);
200 flush_aliases(mapping, page);
201 set_bit(PG_dcache_clean, &page->flags);
204 EXPORT_SYMBOL(flush_dcache_page);
206 void update_mmu_cache(struct vm_area_struct *vma,
207 unsigned long address, pte_t *pte)
209 unsigned long pfn = pte_pfn(*pte);
216 * The zero page is never written to, so never has any dirty
217 * cache lines, and therefore never needs to be flushed.
219 page = pfn_to_page(pfn);
220 if (page == ZERO_PAGE(0))
223 if (!PageReserved(page) &&
224 !test_and_set_bit(PG_dcache_clean, &page->flags)) {
225 unsigned long start = page_to_virt(page);
226 struct address_space *mapping;
228 __flush_dcache(start, start + PAGE_SIZE);
230 mapping = page_mapping(page);
232 flush_aliases(mapping, page);
236 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
239 __flush_dcache(vaddr, vaddr + PAGE_SIZE);
240 copy_page(vto, vfrom);
241 __flush_dcache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE);
244 void clear_user_page(void *addr, unsigned long vaddr, struct page *page)
246 __flush_dcache(vaddr, vaddr + PAGE_SIZE);
248 __flush_dcache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE);
251 void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
252 unsigned long user_vaddr,
253 void *dst, void *src, int len)
255 flush_cache_page(vma, user_vaddr, page_to_pfn(page));
256 memcpy(dst, src, len);
257 __flush_dcache((unsigned long)src, (unsigned long)src + len);
258 if (vma->vm_flags & VM_EXEC)
259 __flush_icache((unsigned long)src, (unsigned long)src + len);
262 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
263 unsigned long user_vaddr,
264 void *dst, void *src, int len)
266 flush_cache_page(vma, user_vaddr, page_to_pfn(page));
267 memcpy(dst, src, len);
268 __flush_dcache((unsigned long)dst, (unsigned long)dst + len);
269 if (vma->vm_flags & VM_EXEC)
270 __flush_icache((unsigned long)dst, (unsigned long)dst + len);