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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kona_l2_cache.c (1269B)

      1/*
      2 * Copyright (C) 2012-2014 Broadcom Corporation
      3 *
      4 * This program is free software; you can redistribute it and/or
      5 * modify it under the terms of the GNU General Public License as
      6 * published by the Free Software Foundation version 2.
      7 *
      8 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
      9 * kind, whether express or implied; without even the implied warranty
     10 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     11 * GNU General Public License for more details.
     12 */
     13
     14
     15#include <linux/init.h>
     16#include <linux/printk.h>
     17#include <asm/hardware/cache-l2x0.h>
     18
     19#include "bcm_kona_smc.h"
     20#include "kona_l2_cache.h"
     21
     22void __init kona_l2_cache_init(void)
     23{
     24	unsigned int result;
     25	int ret;
     26
     27	ret = bcm_kona_smc_init();
     28	if (ret) {
     29		pr_info("Secure API not available (%d). Skipping L2 init.\n",
     30			ret);
     31		return;
     32	}
     33
     34	result = bcm_kona_smc(SSAPI_ENABLE_L2_CACHE, 0, 0, 0, 0);
     35	if (result != SEC_ROM_RET_OK) {
     36		pr_err("Secure Monitor call failed (%u)! Skipping L2 init.\n",
     37			result);
     38		return;
     39	}
     40
     41	/*
     42	 * The aux_val and aux_mask have no effect since L2 cache is already
     43	 * enabled.  Pass 0s for aux_val and 1s for aux_mask for default value.
     44	 */
     45	ret = l2x0_of_init(0, ~0);
     46	if (ret)
     47		pr_err("Couldn't enable L2 cache: %d\n", ret);
     48}