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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/powerpc/kernel/idle_power4.S
10817 views
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/*

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 *  This file contains the power_save function for 970-family CPUs.

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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 License

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 *  as published by the Free Software Foundation; either version

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

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 */

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#include <linux/threads.h>

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#include <asm/processor.h>

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#include <asm/page.h>

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#include <asm/cputable.h>

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#include <asm/thread_info.h>

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#include <asm/ppc_asm.h>

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#include <asm/asm-offsets.h>

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#undef DEBUG

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	.text

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_GLOBAL(power4_idle)

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BEGIN_FTR_SECTION

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	blr

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END_FTR_SECTION_IFCLR(CPU_FTR_CAN_NAP)

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	/* Now check if user or arch enabled NAP mode */

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	LOAD_REG_ADDRBASE(r3,powersave_nap)

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	lwz	r4,ADDROFF(powersave_nap)(r3)

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	cmpwi	0,r4,0

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	beqlr

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	/* Go to NAP now */

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	mfmsr	r7

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	rldicl	r0,r7,48,1

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	rotldi	r0,r0,16

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	mtmsrd	r0,1			/* hard-disable interrupts */

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	li	r0,1

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	stb	r0,PACASOFTIRQEN(r13)	/* we'll hard-enable shortly */

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	stb	r0,PACAHARDIRQEN(r13)

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BEGIN_FTR_SECTION

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	DSSALL

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	sync

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END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)

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	clrrdi	r9,r1,THREAD_SHIFT	/* current thread_info */

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	ld	r8,TI_LOCAL_FLAGS(r9)	/* set napping bit */

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	ori	r8,r8,_TLF_NAPPING	/* so when we take an exception */

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	std	r8,TI_LOCAL_FLAGS(r9)	/* it will return to our caller */

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	ori	r7,r7,MSR_EE

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	oris	r7,r7,MSR_POW@h

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1:	sync

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	isync

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	mtmsrd	r7

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	isync

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	b	1b

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