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Commit afeb90ca authored by Hyok S. Choi's avatar Hyok S. Choi Committed by Russell King
Browse files

[ARM] Support register switch in nommu mode 



This patch adds register switch support in nommu mode.

Signed-off-by: default avatarHyok S. Choi <hyok.choi@samsung.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent e72b0475

arch/arm/kernel/entry-armv.S

+7 −0
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ 
 *

 *  Copyright (C) 1996,1997,1998 Russell King.

 *  ARM700 fix by Matthew Godbolt (linux-user@willothewisp.demon.co.uk)

 *  nommu support by Hyok S. Choi (hyok.choi@samsung.com)

 *

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

 * it under the terms of the GNU General Public License version 2 as
@@ -538,7 +539,11 @@ ENTRY(__switch_to) 
	add	ip, r1, #TI_CPU_SAVE

	ldr	r3, [r2, #TI_TP_VALUE]

	stmia	ip!, {r4 - sl, fp, sp, lr}	@ Store most regs on stack

#ifndef CONFIG_MMU

	add	r2, r2, #TI_CPU_DOMAIN

#else

	ldr	r6, [r2, #TI_CPU_DOMAIN]!

#endif

#if __LINUX_ARM_ARCH__ >= 6

#ifdef CONFIG_CPU_MPCORE

	clrex
@@ -556,7 +561,9 @@ ENTRY(__switch_to) 
	mov	r4, #0xffff0fff

	str	r3, [r4, #-15]			@ TLS val at 0xffff0ff0

#endif

#ifdef CONFIG_MMU

	mcr	p15, 0, r6, c3, c0, 0		@ Set domain register

#endif

#ifdef CONFIG_VFP

	@ Always disable VFP so we can lazily save/restore the old

	@ state. This occurs in the context of the previous thread.