diff options
| author | Doug Thompson <dougthompson@xmission.h> | 2007-07-26 10:41:15 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-26 11:35:18 -0700 |
| commit | 39c29657fcf6060d71e04f1e52e5bb4b2999644f (patch) | |
| tree | c8845c9bdea19716b28c9439ad39d5e69dea72b1 /include/asm-mips | |
| parent | d4c1465b7de9686c4c5aa533b15c09ab014aab3a (diff) | |
include/asm-:mips add missing edac h file
EDAC has a foundation to perform software memory scrubbing, but it requires a
per architecture (atomic_scrub) function for performing an atomic update
operation. Under X86, this is done with a
lock: add [addr],0
in the file asm-x86/edac.h
This patch provides the MIPS arch with that atomic function, atomic_scrub() in
asm-mips/edac.h
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Doug Thompson <dougthompson@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-mips')
| -rw-r--r-- | include/asm-mips/edac.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/include/asm-mips/edac.h b/include/asm-mips/edac.h new file mode 100644 index 000000000000..83719eee2d13 --- /dev/null +++ b/include/asm-mips/edac.h @@ -0,0 +1,35 @@ +#ifndef ASM_EDAC_H +#define ASM_EDAC_H + +/* ECC atomic, DMA, SMP and interrupt safe scrub function */ + +static inline void atomic_scrub(void *va, u32 size) +{ + unsigned long *virt_addr = va; + unsigned long temp; + u32 i; + + for (i = 0; i < size / sizeof(unsigned long); i++, virt_addr++) { + + /* + * Very carefully read and write to memory atomically + * so we are interrupt, DMA and SMP safe. + * + * Intel: asm("lock; addl $0, %0"::"m"(*virt_addr)); + */ + + __asm__ __volatile__ ( + " .set mips3 \n" + "1: ll %0, %1 # atomic_add \n" + " ll %0, %1 # atomic_add \n" + " addu %0, $0 \n" + " sc %0, %1 \n" + " beqz %0, 1b \n" + " .set mips0 \n" + : "=&r" (temp), "=m" (*virt_addr) + : "m" (*virt_addr)); + + } +} + +#endif |