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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arm/boot/compressed/head-sa1100.S
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/* SPDX-License-Identifier: GPL-2.0 */

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/* 

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 * linux/arch/arm/boot/compressed/head-sa1100.S

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 * 

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 * Copyright (C) 1999 Nicolas Pitre <[email protected]>

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 * 

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 * SA1100 specific tweaks.  This is merged into head.S by the linker.

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 *

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 */

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#include <linux/linkage.h>

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#include <asm/mach-types.h>

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		.section        ".start", "ax"

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		.arch	armv4

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__SA1100_start:

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		@ Preserve r8/r7 i.e. kernel entry values

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#ifdef CONFIG_SA1100_COLLIE

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		mov	r7, #MACH_TYPE_COLLIE

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#endif

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		mrc	p15, 0, r0, c1, c0, 0	@ read control reg

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		ands	r0, r0, #0x0d

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		beq	99f

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		@ Data cache might be active.

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		@ Be sure to flush kernel binary out of the cache,

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		@ whatever state it is, before it is turned off.

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		@ This is done by fetching through currently executed

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		@ memory to be sure we hit the same cache.

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		bic	r2, pc, #0x1f

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		add	r3, r2, #0x4000		@ 16 kb is quite enough...

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1:		ldr	r0, [r2], #32

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		teq	r2, r3

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		bne	1b

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		mcr	p15, 0, r0, c7, c10, 4	@ drain WB

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		mcr	p15, 0, r0, c7, c7, 0	@ flush I & D caches

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		@ disabling MMU and caches

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		mrc	p15, 0, r0, c1, c0, 0	@ read control reg

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		bic	r0, r0, #0x0d		@ clear WB, DC, MMU

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		bic	r0, r0, #0x1000		@ clear Icache

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		mcr	p15, 0, r0, c1, c0, 0

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99:

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