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

cache-shx3.c (1026B)

      1/*
      2 * arch/sh/mm/cache-shx3.c - SH-X3 optimized cache ops
      3 *
      4 * Copyright (C) 2010  Paul Mundt
      5 *
      6 * This file is subject to the terms and conditions of the GNU General Public
      7 * License.  See the file "COPYING" in the main directory of this archive
      8 * for more details.
      9 */
     10#include <linux/init.h>
     11#include <linux/kernel.h>
     12#include <linux/io.h>
     13#include <asm/cache.h>
     14
     15#define CCR_CACHE_SNM	0x40000		/* Hardware-assisted synonym avoidance */
     16#define CCR_CACHE_IBE	0x1000000	/* ICBI broadcast */
     17
     18void __init shx3_cache_init(void)
     19{
     20	unsigned int ccr;
     21
     22	ccr = __raw_readl(SH_CCR);
     23
     24	/*
     25	 * If we've got cache aliases, resolve them in hardware.
     26	 */
     27	if (boot_cpu_data.dcache.n_aliases || boot_cpu_data.icache.n_aliases) {
     28		ccr |= CCR_CACHE_SNM;
     29
     30		boot_cpu_data.icache.n_aliases = 0;
     31		boot_cpu_data.dcache.n_aliases = 0;
     32
     33		pr_info("Enabling hardware synonym avoidance\n");
     34	}
     35
     36#ifdef CONFIG_SMP
     37	/*
     38	 * Broadcast I-cache block invalidations by default.
     39	 */
     40	ccr |= CCR_CACHE_IBE;
     41#endif
     42
     43	writel_uncached(ccr, SH_CCR);
     44}