LXR linux/arch/m68k/coldfire/cache.c

   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/***************************************************************************/
  50