[mirror_ubuntu-bionic-kernel.git] / arch / mips / include / asm / edac.h

/* SPDX-License-Identifier: GPL-2.0 */
#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
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
39c29657 DT	2	#ifndef ASM_EDAC_H
	3	#define ASM_EDAC_H
	4
b0984c43 MR	5	#include <asm/compiler.h>
b0984c43 MR	6
39c29657 DT	7	/* ECC atomic, DMA, SMP and interrupt safe scrub function */
39c29657 DT	8
b01aec9b	9	static inline void edac_atomic_scrub(void *va, u32 size)
39c29657 DT	10	{
	11	unsigned long *virt_addr = va;
	12	unsigned long temp;
	13	u32 i;
	14
1bfa771e	15	for (i = 0; i < size / sizeof(unsigned long); i++) {
39c29657 DT	16	/*
	17	* Very carefully read and write to memory atomically
	18	* so we are interrupt, DMA and SMP safe.
	19	*
	20	* Intel: asm("lock; addl $0, %0"::"m"(*virt_addr));
	21	*/
	22
	23	__asm__ __volatile__ (
1bfa771e	24	" .set mips2 \n"
b01aec9b	25	"1: ll %0, %1 # edac_atomic_scrub \n"
1bfa771e RB	26	" addu %0, $0 \n"
	27	" sc %0, %1 \n"
	28	" beqz %0, 1b \n"
	29	" .set mips0 \n"
94bfb75a MC	30	: "=&r" (temp), "=" GCC_OFF_SMALL_ASM() (*virt_addr)
94bfb75a MC	31	: GCC_OFF_SMALL_ASM() (*virt_addr));
39c29657	32
1bfa771e	33	virt_addr++;
39c29657 DT	34	}
	35	}
	36
	37	#endif