cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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edac.h (839B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef ASM_EDAC_H
      3#define ASM_EDAC_H
      4
      5#include <asm/compiler.h>
      6
      7/* ECC atomic, DMA, SMP and interrupt safe scrub function */
      8
      9static inline void edac_atomic_scrub(void *va, u32 size)
     10{
     11	unsigned long *virt_addr = va;
     12	unsigned long temp;
     13	u32 i;
     14
     15	for (i = 0; i < size / sizeof(unsigned long); i++) {
     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__ (
     24		"	.set	push					\n"
     25		"	.set	mips2					\n"
     26		"1:	ll	%0, %1		# edac_atomic_scrub	\n"
     27		"	addu	%0, $0					\n"
     28		"	sc	%0, %1					\n"
     29		"	beqz	%0, 1b					\n"
     30		"	.set	pop					\n"
     31		: "=&r" (temp), "=" GCC_OFF_SMALL_ASM() (*virt_addr)
     32		: GCC_OFF_SMALL_ASM() (*virt_addr));
     33
     34		virt_addr++;
     35	}
     36}
     37
     38#endif