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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dma.c (545B)

      1// SPDX-License-Identifier: GPL-2.0+
      2
      3#include <linux/types.h>
      4#include <linux/dma-map-ops.h>
      5#include <asm/bmips.h>
      6#include <asm/io.h>
      7
      8void arch_sync_dma_for_cpu_all(void)
      9{
     10	void __iomem *cbr = BMIPS_GET_CBR();
     11	u32 cfg;
     12
     13	if (boot_cpu_type() != CPU_BMIPS3300 &&
     14	    boot_cpu_type() != CPU_BMIPS4350 &&
     15	    boot_cpu_type() != CPU_BMIPS4380)
     16		return;
     17
     18	/* Flush stale data out of the readahead cache */
     19	cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
     20	__raw_writel(cfg | 0x100, cbr + BMIPS_RAC_CONFIG);
     21	__raw_readl(cbr + BMIPS_RAC_CONFIG);
     22}