arch/m68k/coldfire/cache.c

Source file repositories/reference/linux-study-clean/arch/m68k/coldfire/cache.c

File Facts

System
Linux kernel
Corpus path
arch/m68k/coldfire/cache.c
Extension
.c
Size
1322 bytes
Lines
50
Domain
Architecture Layer
Bucket
arch/m68k
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/***************************************************************************/

/*
 *	cache.c -- general ColdFire Cache maintenance code
 *
 *	Copyright (C) 2010, Greg Ungerer (gerg@snapgear.com)
 */

/***************************************************************************/

#include <linux/kernel.h>
#include <asm/coldfire.h>
#include <asm/mcfsim.h>

/***************************************************************************/
#ifdef CACHE_PUSH
/***************************************************************************/

/*
 *	Use cpushl to push all dirty cache lines back to memory.
 *	Older versions of GAS don't seem to know how to generate the
 *	ColdFire cpushl instruction... Oh well, bit stuff it for now.
 */

void mcf_cache_push(void)
{
	__asm__ __volatile__ (
		"clrl	%%d0\n\t"
		"1:\n\t"
		"movel	%%d0,%%a0\n\t"
		"2:\n\t"
		".word	0xf468\n\t"
		"addl	%0,%%a0\n\t"
		"cmpl	%1,%%a0\n\t"
		"blt	2b\n\t"
		"addql	#1,%%d0\n\t"
		"cmpil	%2,%%d0\n\t"
		"bne	1b\n\t"
		: /* No output */
		: "i" (CACHE_LINE_SIZE),
		  "i" (DCACHE_SIZE / CACHE_WAYS),
		  "i" (CACHE_WAYS)
		: "d0", "a0" );
}

/***************************************************************************/
#endif /* CACHE_PUSH */
/***************************************************************************/

Annotation

Implementation Notes