50 lines
1.3 KiB
C
Executable file
50 lines
1.3 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0
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/***************************************************************************/
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/*
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* cache.c -- general ColdFire Cache maintenance code
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*
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* Copyright (C) 2010, Greg Ungerer (gerg@snapgear.com)
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*/
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/***************************************************************************/
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#include <linux/kernel.h>
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#include <asm/coldfire.h>
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#include <asm/mcfsim.h>
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/***************************************************************************/
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#ifdef CACHE_PUSH
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/***************************************************************************/
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/*
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* Use cpushl to push all dirty cache lines back to memory.
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* Older versions of GAS don't seem to know how to generate the
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* ColdFire cpushl instruction... Oh well, bit stuff it for now.
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*/
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void mcf_cache_push(void)
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{
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__asm__ __volatile__ (
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"clrl %%d0\n\t"
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"1:\n\t"
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"movel %%d0,%%a0\n\t"
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"2:\n\t"
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".word 0xf468\n\t"
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"addl %0,%%a0\n\t"
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"cmpl %1,%%a0\n\t"
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"blt 2b\n\t"
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"addql #1,%%d0\n\t"
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"cmpil %2,%%d0\n\t"
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"bne 1b\n\t"
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: /* No output */
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: "i" (CACHE_LINE_SIZE),
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"i" (DCACHE_SIZE / CACHE_WAYS),
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"i" (CACHE_WAYS)
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: "d0", "a0" );
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}
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/***************************************************************************/
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#endif /* CACHE_PUSH */
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/***************************************************************************/
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