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6c44741d75
Implement the architecture specific portitions of the UACCESS_FLUSHCACHE API. This provides functions for the copy_user_flushcache iterator that ensure that when the copy is finished the destination buffer contains a copy of the original and that the destination buffer is clean in the processor caches. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
/*
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* Copyright(c) 2017 IBM Corporation. All rights reserved.
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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 version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/string.h>
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#include <linux/export.h>
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#include <linux/uaccess.h>
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#include <asm/cacheflush.h>
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/*
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* CONFIG_ARCH_HAS_PMEM_API symbols
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*/
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void arch_wb_cache_pmem(void *addr, size_t size)
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{
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unsigned long start = (unsigned long) addr;
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flush_inval_dcache_range(start, start + size);
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}
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EXPORT_SYMBOL(arch_wb_cache_pmem);
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void arch_invalidate_pmem(void *addr, size_t size)
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{
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unsigned long start = (unsigned long) addr;
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flush_inval_dcache_range(start, start + size);
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}
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EXPORT_SYMBOL(arch_invalidate_pmem);
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/*
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* CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE symbols
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*/
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long __copy_from_user_flushcache(void *dest, const void __user *src,
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unsigned size)
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{
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unsigned long copied, start = (unsigned long) dest;
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copied = __copy_from_user(dest, src, size);
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flush_inval_dcache_range(start, start + size);
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return copied;
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}
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void *memcpy_flushcache(void *dest, const void *src, size_t size)
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{
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unsigned long start = (unsigned long) dest;
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memcpy(dest, src, size);
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flush_inval_dcache_range(start, start + size);
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return dest;
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}
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EXPORT_SYMBOL(memcpy_flushcache);
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void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
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size_t len)
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{
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memcpy_flushcache(to, page_to_virt(page) + offset, len);
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}
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EXPORT_SYMBOL(memcpy_page_flushcache);
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