cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

edac.h (995B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Copyright 2011 Calxeda, Inc.
      4 * Based on PPC version Copyright 2007 MontaVista Software, Inc.
      5 */
      6#ifndef ASM_EDAC_H
      7#define ASM_EDAC_H
      8/*
      9 * ECC atomic, DMA, SMP and interrupt safe scrub function.
     10 * Implements the per arch edac_atomic_scrub() that EDAC use for software
     11 * ECC scrubbing.  It reads memory and then writes back the original
     12 * value, allowing the hardware to detect and correct memory errors.
     13 */
     14
     15static inline void edac_atomic_scrub(void *va, u32 size)
     16{
     17#if __LINUX_ARM_ARCH__ >= 6
     18	unsigned int *virt_addr = va;
     19	unsigned int temp, temp2;
     20	unsigned int i;
     21
     22	for (i = 0; i < size / sizeof(*virt_addr); i++, virt_addr++) {
     23		/* Very carefully read and write to memory atomically
     24		 * so we are interrupt, DMA and SMP safe.
     25		 */
     26		__asm__ __volatile__("\n"
     27			"1:	ldrex	%0, [%2]\n"
     28			"	strex	%1, %0, [%2]\n"
     29			"	teq	%1, #0\n"
     30			"	bne	1b\n"
     31			: "=&r"(temp), "=&r"(temp2)
     32			: "r"(virt_addr)
     33			: "cc");
     34	}
     35#endif
     36}
     37
     38#endif