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68ca3e537f
The current implementation of copy_to_user_page() gives "vaddr" to the cache instruction when trying to sync the icache with the dcache. If vaddr does not exist in the TLB, the CPU will silently abort the operation, which may result in the caches staying out of sync. To fix this, pass the "dst" parameter to flush_icache_range() instead -- we know this is valid because we just wrote to it. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
132 lines
3.9 KiB
C
132 lines
3.9 KiB
C
/*
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* Copyright (C) 2004-2006 Atmel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_AVR32_CACHEFLUSH_H
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#define __ASM_AVR32_CACHEFLUSH_H
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/* Keep includes the same across arches. */
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#include <linux/mm.h>
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#define CACHE_OP_ICACHE_INVALIDATE 0x01
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#define CACHE_OP_DCACHE_INVALIDATE 0x0b
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#define CACHE_OP_DCACHE_CLEAN 0x0c
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#define CACHE_OP_DCACHE_CLEAN_INVAL 0x0d
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/*
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* Invalidate any cacheline containing virtual address vaddr without
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* writing anything back to memory.
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*
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* Note that this function may corrupt unrelated data structures when
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* applied on buffers that are not cacheline aligned in both ends.
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*/
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static inline void invalidate_dcache_line(void *vaddr)
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{
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asm volatile("cache %0[0], %1"
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:
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: "r"(vaddr), "n"(CACHE_OP_DCACHE_INVALIDATE)
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: "memory");
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}
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/*
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* Make sure any cacheline containing virtual address vaddr is written
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* to memory.
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*/
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static inline void clean_dcache_line(void *vaddr)
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{
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asm volatile("cache %0[0], %1"
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:
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: "r"(vaddr), "n"(CACHE_OP_DCACHE_CLEAN)
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: "memory");
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}
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/*
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* Make sure any cacheline containing virtual address vaddr is written
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* to memory and then invalidate it.
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*/
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static inline void flush_dcache_line(void *vaddr)
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{
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asm volatile("cache %0[0], %1"
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:
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: "r"(vaddr), "n"(CACHE_OP_DCACHE_CLEAN_INVAL)
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: "memory");
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}
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/*
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* Invalidate any instruction cacheline containing virtual address
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* vaddr.
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*/
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static inline void invalidate_icache_line(void *vaddr)
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{
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asm volatile("cache %0[0], %1"
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:
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: "r"(vaddr), "n"(CACHE_OP_ICACHE_INVALIDATE)
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: "memory");
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}
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/*
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* Applies the above functions on all lines that are touched by the
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* specified virtual address range.
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*/
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void invalidate_dcache_region(void *start, size_t len);
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void clean_dcache_region(void *start, size_t len);
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void flush_dcache_region(void *start, size_t len);
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void invalidate_icache_region(void *start, size_t len);
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/*
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* Make sure any pending writes are completed before continuing.
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*/
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#define flush_write_buffer() asm volatile("sync 0" : : : "memory")
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/*
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* The following functions are called when a virtual mapping changes.
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* We do not need to flush anything in this case.
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*/
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#define flush_cache_all() do { } while (0)
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#define flush_cache_mm(mm) do { } while (0)
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#define flush_cache_dup_mm(mm) do { } while (0)
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#define flush_cache_range(vma, start, end) do { } while (0)
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#define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
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#define flush_cache_vmap(start, end) do { } while (0)
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#define flush_cache_vunmap(start, end) do { } while (0)
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/*
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* I think we need to implement this one to be able to reliably
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* execute pages from RAMDISK. However, if we implement the
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* flush_dcache_*() functions, it might not be needed anymore.
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*
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* #define flush_icache_page(vma, page) do { } while (0)
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*/
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extern void flush_icache_page(struct vm_area_struct *vma, struct page *page);
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/*
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* These are (I think) related to D-cache aliasing. We might need to
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* do something here, but only for certain configurations. No such
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* configurations exist at this time.
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*/
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#define flush_dcache_page(page) do { } while (0)
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#define flush_dcache_mmap_lock(page) do { } while (0)
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#define flush_dcache_mmap_unlock(page) do { } while (0)
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/*
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* These are for I/D cache coherency. In this case, we do need to
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* flush with all configurations.
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*/
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extern void flush_icache_range(unsigned long start, unsigned long end);
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extern void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
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unsigned long vaddr, void *dst, const void *src,
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unsigned long len);
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static inline void copy_from_user_page(struct vm_area_struct *vma,
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struct page *page, unsigned long vaddr, void *dst,
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const void *src, unsigned long len)
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{
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memcpy(dst, src, len);
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}
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#endif /* __ASM_AVR32_CACHEFLUSH_H */
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