[deliverable/linux.git] / arch / mips / include / asm / edac.h

#ifndef ASM_EDAC_H
#define ASM_EDAC_H

#include <asm/compiler.h>

/* ECC atomic, DMA, SMP and interrupt safe scrub function */

static inline void edac_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++) {
		/*
		 * 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	mips2					\n"
		"1:	ll	%0, %1		# edac_atomic_scrub	\n"
		"	addu	%0, $0					\n"
		"	sc	%0, %1					\n"
		"	beqz	%0, 1b					\n"
		"	.set	mips0					\n"
		: "=&r" (temp), "=" GCC_OFF_SMALL_ASM() (*virt_addr)
		: GCC_OFF_SMALL_ASM() (*virt_addr));

		virt_addr++;
	}
}

#endif
Commit	Line	Data
39c29657 DT	1	#ifndef ASM_EDAC_H
	2	#define ASM_EDAC_H
	3
b0984c43 MR	4	#include <asm/compiler.h>
b0984c43 MR	5
39c29657 DT	6	/* ECC atomic, DMA, SMP and interrupt safe scrub function */
39c29657 DT	7
b01aec9b	8	static inline void edac_atomic_scrub(void *va, u32 size)
39c29657 DT	9	{
	10	unsigned long *virt_addr = va;
	11	unsigned long temp;
	12	u32 i;
	13
1bfa771e	14	for (i = 0; i < size / sizeof(unsigned long); i++) {
39c29657 DT	15	/*
	16	* Very carefully read and write to memory atomically
	17	* so we are interrupt, DMA and SMP safe.
	18	*
	19	* Intel: asm("lock; addl $0, %0"::"m"(*virt_addr));
	20	*/
	21
	22	__asm__ __volatile__ (
1bfa771e	23	" .set mips2 \n"
b01aec9b	24	"1: ll %0, %1 # edac_atomic_scrub \n"
1bfa771e RB	25	" addu %0, $0 \n"
	26	" sc %0, %1 \n"
	27	" beqz %0, 1b \n"
	28	" .set mips0 \n"
94bfb75a MC	29	: "=&r" (temp), "=" GCC_OFF_SMALL_ASM() (*virt_addr)
94bfb75a MC	30	: GCC_OFF_SMALL_ASM() (*virt_addr));
39c29657	31
1bfa771e	32	virt_addr++;
39c29657 DT	33	}
	34	}
	35
	36	#endif