![Oliver O'Halloran](/assets/img/avatar_default.png)
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
/*
|
|
* Copyright(c) 2017 IBM Corporation. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of version 2 of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/string.h>
|
|
#include <linux/export.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
|
|
/*
|
|
* CONFIG_ARCH_HAS_PMEM_API symbols
|
|
*/
|
|
void arch_wb_cache_pmem(void *addr, size_t size)
|
|
{
|
|
unsigned long start = (unsigned long) addr;
|
|
flush_inval_dcache_range(start, start + size);
|
|
}
|
|
EXPORT_SYMBOL(arch_wb_cache_pmem);
|
|
|
|
void arch_invalidate_pmem(void *addr, size_t size)
|
|
{
|
|
unsigned long start = (unsigned long) addr;
|
|
flush_inval_dcache_range(start, start + size);
|
|
}
|
|
EXPORT_SYMBOL(arch_invalidate_pmem);
|
|
|
|
/*
|
|
* CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE symbols
|
|
*/
|
|
long __copy_from_user_flushcache(void *dest, const void __user *src,
|
|
unsigned size)
|
|
{
|
|
unsigned long copied, start = (unsigned long) dest;
|
|
|
|
copied = __copy_from_user(dest, src, size);
|
|
flush_inval_dcache_range(start, start + size);
|
|
|
|
return copied;
|
|
}
|
|
|
|
void *memcpy_flushcache(void *dest, const void *src, size_t size)
|
|
{
|
|
unsigned long start = (unsigned long) dest;
|
|
|
|
memcpy(dest, src, size);
|
|
flush_inval_dcache_range(start, start + size);
|
|
|
|
return dest;
|
|
}
|
|
EXPORT_SYMBOL(memcpy_flushcache);
|
|
|
|
void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
|
|
size_t len)
|
|
{
|
|
memcpy_flushcache(to, page_to_virt(page) + offset, len);
|
|
}
|
|
EXPORT_SYMBOL(memcpy_page_flushcache);
|