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272 lines
6.9 KiB
272 lines
6.9 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 2009, Wind River Systems Inc |
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* Implemented by [email protected] and [email protected] |
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*/ |
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#include <linux/export.h> |
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#include <linux/sched.h> |
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#include <linux/mm.h> |
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#include <linux/fs.h> |
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#include <asm/cacheflush.h> |
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#include <asm/cpuinfo.h> |
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static void __flush_dcache(unsigned long start, unsigned long end) |
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{ |
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unsigned long addr; |
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start &= ~(cpuinfo.dcache_line_size - 1); |
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end += (cpuinfo.dcache_line_size - 1); |
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end &= ~(cpuinfo.dcache_line_size - 1); |
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if (end > start + cpuinfo.dcache_size) |
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end = start + cpuinfo.dcache_size; |
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for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) { |
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__asm__ __volatile__ (" flushd 0(%0)\n" |
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: /* Outputs */ |
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: /* Inputs */ "r"(addr) |
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/* : No clobber */); |
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} |
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} |
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static void __invalidate_dcache(unsigned long start, unsigned long end) |
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{ |
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unsigned long addr; |
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start &= ~(cpuinfo.dcache_line_size - 1); |
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end += (cpuinfo.dcache_line_size - 1); |
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end &= ~(cpuinfo.dcache_line_size - 1); |
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for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) { |
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__asm__ __volatile__ (" initda 0(%0)\n" |
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: /* Outputs */ |
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: /* Inputs */ "r"(addr) |
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/* : No clobber */); |
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} |
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} |
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static void __flush_icache(unsigned long start, unsigned long end) |
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{ |
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unsigned long addr; |
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start &= ~(cpuinfo.icache_line_size - 1); |
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end += (cpuinfo.icache_line_size - 1); |
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end &= ~(cpuinfo.icache_line_size - 1); |
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if (end > start + cpuinfo.icache_size) |
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end = start + cpuinfo.icache_size; |
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for (addr = start; addr < end; addr += cpuinfo.icache_line_size) { |
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__asm__ __volatile__ (" flushi %0\n" |
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: /* Outputs */ |
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: /* Inputs */ "r"(addr) |
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/* : No clobber */); |
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} |
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__asm__ __volatile(" flushp\n"); |
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} |
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static void flush_aliases(struct address_space *mapping, struct page *page) |
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{ |
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struct mm_struct *mm = current->active_mm; |
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struct vm_area_struct *mpnt; |
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pgoff_t pgoff; |
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pgoff = page->index; |
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flush_dcache_mmap_lock(mapping); |
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vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) { |
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unsigned long offset; |
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if (mpnt->vm_mm != mm) |
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continue; |
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if (!(mpnt->vm_flags & VM_MAYSHARE)) |
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continue; |
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offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT; |
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flush_cache_page(mpnt, mpnt->vm_start + offset, |
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page_to_pfn(page)); |
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} |
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flush_dcache_mmap_unlock(mapping); |
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} |
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void flush_cache_all(void) |
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{ |
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__flush_dcache(0, cpuinfo.dcache_size); |
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__flush_icache(0, cpuinfo.icache_size); |
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} |
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void flush_cache_mm(struct mm_struct *mm) |
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{ |
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flush_cache_all(); |
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} |
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void flush_cache_dup_mm(struct mm_struct *mm) |
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{ |
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flush_cache_all(); |
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} |
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void flush_icache_range(unsigned long start, unsigned long end) |
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{ |
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__flush_dcache(start, end); |
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__flush_icache(start, end); |
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} |
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void flush_dcache_range(unsigned long start, unsigned long end) |
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{ |
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__flush_dcache(start, end); |
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__flush_icache(start, end); |
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} |
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EXPORT_SYMBOL(flush_dcache_range); |
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void invalidate_dcache_range(unsigned long start, unsigned long end) |
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{ |
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__invalidate_dcache(start, end); |
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} |
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EXPORT_SYMBOL(invalidate_dcache_range); |
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void flush_cache_range(struct vm_area_struct *vma, unsigned long start, |
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unsigned long end) |
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{ |
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__flush_dcache(start, end); |
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if (vma == NULL || (vma->vm_flags & VM_EXEC)) |
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__flush_icache(start, end); |
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} |
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void flush_icache_page(struct vm_area_struct *vma, struct page *page) |
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{ |
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unsigned long start = (unsigned long) page_address(page); |
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unsigned long end = start + PAGE_SIZE; |
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__flush_dcache(start, end); |
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__flush_icache(start, end); |
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} |
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void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, |
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unsigned long pfn) |
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{ |
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unsigned long start = vmaddr; |
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unsigned long end = start + PAGE_SIZE; |
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__flush_dcache(start, end); |
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if (vma->vm_flags & VM_EXEC) |
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__flush_icache(start, end); |
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} |
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void __flush_dcache_page(struct address_space *mapping, struct page *page) |
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{ |
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/* |
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* Writeback any data associated with the kernel mapping of this |
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* page. This ensures that data in the physical page is mutually |
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* coherent with the kernels mapping. |
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*/ |
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unsigned long start = (unsigned long)page_address(page); |
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__flush_dcache(start, start + PAGE_SIZE); |
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} |
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void flush_dcache_page(struct page *page) |
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{ |
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struct address_space *mapping; |
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/* |
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* The zero page is never written to, so never has any dirty |
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* cache lines, and therefore never needs to be flushed. |
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*/ |
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if (page == ZERO_PAGE(0)) |
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return; |
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mapping = page_mapping_file(page); |
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/* Flush this page if there are aliases. */ |
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if (mapping && !mapping_mapped(mapping)) { |
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clear_bit(PG_dcache_clean, &page->flags); |
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} else { |
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__flush_dcache_page(mapping, page); |
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if (mapping) { |
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unsigned long start = (unsigned long)page_address(page); |
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flush_aliases(mapping, page); |
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flush_icache_range(start, start + PAGE_SIZE); |
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} |
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set_bit(PG_dcache_clean, &page->flags); |
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} |
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} |
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EXPORT_SYMBOL(flush_dcache_page); |
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void update_mmu_cache(struct vm_area_struct *vma, |
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unsigned long address, pte_t *ptep) |
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{ |
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pte_t pte = *ptep; |
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unsigned long pfn = pte_pfn(pte); |
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struct page *page; |
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struct address_space *mapping; |
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reload_tlb_page(vma, address, pte); |
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if (!pfn_valid(pfn)) |
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return; |
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/* |
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* The zero page is never written to, so never has any dirty |
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* cache lines, and therefore never needs to be flushed. |
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*/ |
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page = pfn_to_page(pfn); |
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if (page == ZERO_PAGE(0)) |
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return; |
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mapping = page_mapping_file(page); |
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if (!test_and_set_bit(PG_dcache_clean, &page->flags)) |
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__flush_dcache_page(mapping, page); |
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if(mapping) |
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{ |
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flush_aliases(mapping, page); |
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if (vma->vm_flags & VM_EXEC) |
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flush_icache_page(vma, page); |
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} |
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} |
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void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, |
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struct page *to) |
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{ |
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__flush_dcache(vaddr, vaddr + PAGE_SIZE); |
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__flush_icache(vaddr, vaddr + PAGE_SIZE); |
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copy_page(vto, vfrom); |
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__flush_dcache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE); |
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__flush_icache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE); |
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} |
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void clear_user_page(void *addr, unsigned long vaddr, struct page *page) |
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{ |
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__flush_dcache(vaddr, vaddr + PAGE_SIZE); |
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__flush_icache(vaddr, vaddr + PAGE_SIZE); |
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clear_page(addr); |
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__flush_dcache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE); |
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__flush_icache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE); |
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} |
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void copy_from_user_page(struct vm_area_struct *vma, struct page *page, |
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unsigned long user_vaddr, |
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void *dst, void *src, int len) |
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{ |
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flush_cache_page(vma, user_vaddr, page_to_pfn(page)); |
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memcpy(dst, src, len); |
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__flush_dcache((unsigned long)src, (unsigned long)src + len); |
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if (vma->vm_flags & VM_EXEC) |
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__flush_icache((unsigned long)src, (unsigned long)src + len); |
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} |
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void copy_to_user_page(struct vm_area_struct *vma, struct page *page, |
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unsigned long user_vaddr, |
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void *dst, void *src, int len) |
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{ |
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flush_cache_page(vma, user_vaddr, page_to_pfn(page)); |
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memcpy(dst, src, len); |
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__flush_dcache((unsigned long)dst, (unsigned long)dst + len); |
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if (vma->vm_flags & VM_EXEC) |
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__flush_icache((unsigned long)dst, (unsigned long)dst + len); |
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}
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