From 39c29657fcf6060d71e04f1e52e5bb4b2999644f Mon Sep 17 00:00:00 2001 From: Doug Thompson Date: Thu, 26 Jul 2007 10:41:15 -0700 Subject: [PATCH] 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 Cc: Ralf Baechle Signed-off-by: Doug Thompson Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-mips/edac.h | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 include/asm-mips/edac.h diff --git a/include/asm-mips/edac.h b/include/asm-mips/edac.h new file mode 100644 index 0000000000..83719eee2d --- /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 -- 2.39.5