![Pavel Tatashin](/assets/img/avatar_default.png)
It is safer and simpler to drop the uaccess assembly macros in favour of inline C functions. Although this bloats the Image size slightly, it aligns our user copy routines with '{get,put}_user()' and generally makes the code a lot easier to reason about. Cc: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com> [will: tweaked commit message and changed temporary variable names] Signed-off-by: Will Deacon <will@kernel.org>
41 lines
964 B
C
41 lines
964 B
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2017 ARM Ltd.
|
|
*/
|
|
|
|
#include <linux/uaccess.h>
|
|
#include <asm/barrier.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
void memcpy_flushcache(void *dst, const void *src, size_t cnt)
|
|
{
|
|
/*
|
|
* We assume this should not be called with @dst pointing to
|
|
* non-cacheable memory, such that we don't need an explicit
|
|
* barrier to order the cache maintenance against the memcpy.
|
|
*/
|
|
memcpy(dst, src, cnt);
|
|
__clean_dcache_area_pop(dst, cnt);
|
|
}
|
|
EXPORT_SYMBOL_GPL(memcpy_flushcache);
|
|
|
|
void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
|
|
size_t len)
|
|
{
|
|
memcpy_flushcache(to, page_address(page) + offset, len);
|
|
}
|
|
|
|
unsigned long __copy_user_flushcache(void *to, const void __user *from,
|
|
unsigned long n)
|
|
{
|
|
unsigned long rc;
|
|
|
|
uaccess_enable_not_uao();
|
|
rc = __arch_copy_from_user(to, from, n);
|
|
uaccess_disable_not_uao();
|
|
|
|
/* See above */
|
|
__clean_dcache_area_pop(to, n - rc);
|
|
return rc;
|
|
}
|