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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/mn10300/mm/cache-dbg-inv-by-reg.S
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/* MN10300 CPU cache invalidation routines, using automatic purge registers

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 *

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 * Copyright (C) 2011 Red Hat, Inc. All Rights Reserved.

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 * Written by David Howells ([email protected])

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 *

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 * This program is free software; you can redistribute it and/or

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 * modify it under the terms of the GNU General Public Licence

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 * as published by the Free Software Foundation; either version

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 * 2 of the Licence, or (at your option) any later version.

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 */

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#include <linux/sys.h>

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#include <linux/linkage.h>

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#include <asm/cache.h>

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#include <asm/irqflags.h>

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#include <asm/cacheflush.h>

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#include "cache.inc"

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	.am33_2

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	.globl	debugger_local_cache_flushinv_one

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###############################################################################

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#

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# void debugger_local_cache_flushinv_one(u8 *addr)

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#

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# Invalidate one particular cacheline if it's in the icache

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#

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###############################################################################

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	ALIGN

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	.globl	debugger_local_cache_flushinv_one

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	.type	debugger_local_cache_flushinv_one,@function

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debugger_local_cache_flushinv_one:

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	mov	d0,a1

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	mov	CHCTR,a0

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	movhu	(a0),d0

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	btst	CHCTR_ICEN,d0

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	beq	mn10300_local_icache_inv_range_reg_end

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	LOCAL_CLI_SAVE(d1)

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	mov	ICIVCR,a0

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	# wait for the invalidator to quiesce

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	setlb

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	mov	(a0),d0

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	btst	ICIVCR_ICIVBSY,d0

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	lne

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	# set the mask

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	mov	~L1_CACHE_TAG_MASK,d0

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	mov	d0,(ICIVMR)

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	# invalidate the cache line at the given address

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	and	~L1_CACHE_TAG_MASK,a1

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	or	ICIVCR_ICI,a1

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	mov	a1,(a0)

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	# wait for the invalidator to quiesce again

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	setlb

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	mov	(a0),d0

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	btst	ICIVCR_ICIVBSY,d0

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	lne

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	LOCAL_IRQ_RESTORE(d1)

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mn10300_local_icache_inv_range_reg_end:

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	ret	[],0

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	.size	debugger_local_cache_flushinv_one,.-debugger_local_cache_flushinv_one

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