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 for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {
27 __asm__ __volatile__ (" flushda 0(%0)\n"
29 : /* Inputs */ "r"(addr)
34 static void __flush_dcache_all(unsigned long start, unsigned long end)
38 start &= ~(cpuinfo.dcache_line_size - 1);
39 end += (cpuinfo.dcache_line_size - 1);
40 end &= ~(cpuinfo.dcache_line_size - 1);
42 if (end > start + cpuinfo.dcache_size)
43 end = start + cpuinfo.dcache_size;
45 for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {
46 __asm__ __volatile__ (" flushd 0(%0)\n"
48 : /* Inputs */ "r"(addr)
53 static void __invalidate_dcache(unsigned long start, unsigned long end)
57 start &= ~(cpuinfo.dcache_line_size - 1);
58 end += (cpuinfo.dcache_line_size - 1);
59 end &= ~(cpuinfo.dcache_line_size - 1);
61 if (end > start + cpuinfo.dcache_size)
62 end = start + cpuinfo.dcache_size;
64 for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {
65 __asm__ __volatile__ (" initda 0(%0)\n"
67 : /* Inputs */ "r"(addr)
72 static void __flush_icache(unsigned long start, unsigned long end)
76 start &= ~(cpuinfo.icache_line_size - 1);
77 end += (cpuinfo.icache_line_size - 1);
78 end &= ~(cpuinfo.icache_line_size - 1);
80 if (end > start + cpuinfo.icache_size)
81 end = start + cpuinfo.icache_size;
83 for (addr = start; addr < end; addr += cpuinfo.icache_line_size) {
84 __asm__ __volatile__ (" flushi %0\n"
86 : /* Inputs */ "r"(addr)
89 __asm__ __volatile(" flushp\n");
92 static void flush_aliases(struct address_space *mapping, struct page *page)
94 struct mm_struct *mm = current->active_mm;
95 struct vm_area_struct *mpnt;
100 flush_dcache_mmap_lock(mapping);
101 vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) {
102 unsigned long offset;
104 if (mpnt->vm_mm != mm)
106 if (!(mpnt->vm_flags & VM_MAYSHARE))
109 offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
110 flush_cache_page(mpnt, mpnt->vm_start + offset,
113 flush_dcache_mmap_unlock(mapping);
116 void flush_cache_all(void)
118 __flush_dcache_all(0, cpuinfo.dcache_size);
119 __flush_icache(0, cpuinfo.icache_size);
122 void flush_cache_mm(struct mm_struct *mm)
127 void flush_cache_dup_mm(struct mm_struct *mm)
132 void flush_icache_range(unsigned long start, unsigned long end)
134 __flush_icache(start, end);
137 void flush_dcache_range(unsigned long start, unsigned long end)
139 __flush_dcache(start, end);
141 EXPORT_SYMBOL(flush_dcache_range);
143 void invalidate_dcache_range(unsigned long start, unsigned long end)
145 __invalidate_dcache(start, end);
147 EXPORT_SYMBOL(invalidate_dcache_range);
149 void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
152 __flush_dcache(start, end);
153 if (vma == NULL || (vma->vm_flags & VM_EXEC))
154 __flush_icache(start, end);
157 void flush_icache_page(struct vm_area_struct *vma, struct page *page)
159 unsigned long start = (unsigned long) page_address(page);
160 unsigned long end = start + PAGE_SIZE;
162 __flush_icache(start, end);
165 void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr,
168 unsigned long start = vmaddr;
169 unsigned long end = start + PAGE_SIZE;
171 __flush_dcache(start, end);
172 if (vma->vm_flags & VM_EXEC)
173 __flush_icache(start, end);
176 void flush_dcache_page(struct page *page)
178 struct address_space *mapping;
181 * The zero page is never written to, so never has any dirty
182 * cache lines, and therefore never needs to be flushed.
184 if (page == ZERO_PAGE(0))
187 mapping = page_mapping(page);
189 /* Flush this page if there are aliases. */
190 if (mapping && !mapping_mapped(mapping)) {
191 clear_bit(PG_dcache_clean, &page->flags);
193 unsigned long start = (unsigned long)page_address(page);
195 __flush_dcache_all(start, start + PAGE_SIZE);
197 flush_aliases(mapping, page);
198 set_bit(PG_dcache_clean, &page->flags);
201 EXPORT_SYMBOL(flush_dcache_page);
203 void update_mmu_cache(struct vm_area_struct *vma,
204 unsigned long address, pte_t *pte)
206 unsigned long pfn = pte_pfn(*pte);
213 * The zero page is never written to, so never has any dirty
214 * cache lines, and therefore never needs to be flushed.
216 page = pfn_to_page(pfn);
217 if (page == ZERO_PAGE(0))
220 if (!PageReserved(page) &&
221 !test_and_set_bit(PG_dcache_clean, &page->flags)) {
222 unsigned long start = page_to_virt(page);
223 struct address_space *mapping;
225 __flush_dcache(start, start + PAGE_SIZE);
227 mapping = page_mapping(page);
229 flush_aliases(mapping, page);
233 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
236 __flush_dcache(vaddr, vaddr + PAGE_SIZE);
237 copy_page(vto, vfrom);
238 __flush_dcache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE);
241 void clear_user_page(void *addr, unsigned long vaddr, struct page *page)
243 __flush_dcache(vaddr, vaddr + PAGE_SIZE);
245 __flush_dcache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE);
248 void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
249 unsigned long user_vaddr,
250 void *dst, void *src, int len)
252 flush_cache_page(vma, user_vaddr, page_to_pfn(page));
253 memcpy(dst, src, len);
254 __flush_dcache((unsigned long)src, (unsigned long)src + len);
255 if (vma->vm_flags & VM_EXEC)
256 __flush_icache((unsigned long)src, (unsigned long)src + len);
259 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
260 unsigned long user_vaddr,
261 void *dst, void *src, int len)
263 flush_cache_page(vma, user_vaddr, page_to_pfn(page));
264 memcpy(dst, src, len);
265 __flush_dcache((unsigned long)dst, (unsigned long)dst + len);
266 if (vma->vm_flags & VM_EXEC)
267 __flush_icache((unsigned long)dst, (unsigned long)dst + len);