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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cache.c (1322B)

      1// SPDX-License-Identifier: GPL-2.0
      2/***************************************************************************/
      3
      4/*
      5 *	cache.c -- general ColdFire Cache maintenance code
      6 *
      7 *	Copyright (C) 2010, Greg Ungerer (gerg@snapgear.com)
      8 */
      9
     10/***************************************************************************/
     11
     12#include <linux/kernel.h>
     13#include <asm/coldfire.h>
     14#include <asm/mcfsim.h>
     15
     16/***************************************************************************/
     17#ifdef CACHE_PUSH
     18/***************************************************************************/
     19
     20/*
     21 *	Use cpushl to push all dirty cache lines back to memory.
     22 *	Older versions of GAS don't seem to know how to generate the
     23 *	ColdFire cpushl instruction... Oh well, bit stuff it for now.
     24 */
     25
     26void mcf_cache_push(void)
     27{
     28	__asm__ __volatile__ (
     29		"clrl	%%d0\n\t"
     30		"1:\n\t"
     31		"movel	%%d0,%%a0\n\t"
     32		"2:\n\t"
     33		".word	0xf468\n\t"
     34		"addl	%0,%%a0\n\t"
     35		"cmpl	%1,%%a0\n\t"
     36		"blt	2b\n\t"
     37		"addql	#1,%%d0\n\t"
     38		"cmpil	%2,%%d0\n\t"
     39		"bne	1b\n\t"
     40		: /* No output */
     41		: "i" (CACHE_LINE_SIZE),
     42		  "i" (DCACHE_SIZE / CACHE_WAYS),
     43		  "i" (CACHE_WAYS)
     44		: "d0", "a0" );
     45}
     46
     47/***************************************************************************/
     48#endif /* CACHE_PUSH */
     49/***************************************************************************/