mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 15:43:59 +08:00
786a767465
Add support for architecture specific EDAC atomic_scrub to ARM. Only ARMv6+ is implemented as ldrex/strex instructions are needed. Supporting EDAC on ARMv5 or earlier is unlikely at this point anyway. Signed-off-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/*
|
|
* Copyright 2011 Calxeda, Inc.
|
|
* Based on PPC version Copyright 2007 MontaVista Software, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#ifndef ASM_EDAC_H
|
|
#define ASM_EDAC_H
|
|
/*
|
|
* ECC atomic, DMA, SMP and interrupt safe scrub function.
|
|
* Implements the per arch atomic_scrub() that EDAC use for software
|
|
* ECC scrubbing. It reads memory and then writes back the original
|
|
* value, allowing the hardware to detect and correct memory errors.
|
|
*/
|
|
static inline void atomic_scrub(void *va, u32 size)
|
|
{
|
|
#if __LINUX_ARM_ARCH__ >= 6
|
|
unsigned int *virt_addr = va;
|
|
unsigned int temp, temp2;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < size / sizeof(*virt_addr); i++, virt_addr++) {
|
|
/* Very carefully read and write to memory atomically
|
|
* so we are interrupt, DMA and SMP safe.
|
|
*/
|
|
__asm__ __volatile__("\n"
|
|
"1: ldrex %0, [%2]\n"
|
|
" strex %1, %0, [%2]\n"
|
|
" teq %1, #0\n"
|
|
" bne 1b\n"
|
|
: "=&r"(temp), "=&r"(temp2)
|
|
: "r"(virt_addr)
|
|
: "cc");
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#endif
|