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/*
* Copyright 2010 IBM Corp, Benjamin Herrenschmidt <benh@kernel.crashing.org>
*
* Generic idle routine for Book3E processors
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/threads.h>
#include <asm/reg.h>
#include <asm/ppc_asm.h>
#include <asm/asm-offsets.h>
#include <asm/ppc-opcode.h>
#include <asm/processor.h>
#include <asm/thread_info.h>
/* 64-bit version only for now */
#ifdef CONFIG_PPC64
_GLOBAL(book3e_idle)
/* Save LR for later */
mflr r0
std r0,16(r1)
/* Hard disable interrupts */
wrteei 0
/* Now check if an interrupt came in while we were soft disabled
* since we may otherwise lose it (doorbells etc...). We know
* that since PACAHARDIRQEN will have been cleared in that case.
*/
lbz r3,PACAHARDIRQEN(r13)
cmpwi cr0,r3,0
beqlr
/* Now we are going to mark ourselves as soft and hard enables in
* order to be able to take interrupts while asleep. We inform lockdep
* of that. We don't actually turn interrupts on just yet tho.
*/
#ifdef CONFIG_TRACE_IRQFLAGS
stdu r1,-128(r1)
bl .trace_hardirqs_on
#endif
li r0,1
stb r0,PACASOFTIRQEN(r13)
stb r0,PACAHARDIRQEN(r13)
/* Interrupts will make use return to LR, so get something we want
* in there
*/
bl 1f
/* Hard disable interrupts again */
wrteei 0
/* Mark them off again in the PACA as well */
li r0,0
stb r0,PACASOFTIRQEN(r13)
stb r0,PACAHARDIRQEN(r13)
/* Tell lockdep about it */
#ifdef CONFIG_TRACE_IRQFLAGS
bl .trace_hardirqs_off
addi r1,r1,128
#endif
ld r0,16(r1)
mtlr r0
blr
1: /* Let's set the _TLF_NAPPING flag so interrupts make us return
* to the right spot
*/
clrrdi r11,r1,THREAD_SHIFT
ld r10,TI_LOCAL_FLAGS(r11)
ori r10,r10,_TLF_NAPPING
std r10,TI_LOCAL_FLAGS(r11)
/* We can now re-enable hard interrupts and go to sleep */
wrteei 1
1: PPC_WAIT(0)
b 1b
#endif /* CONFIG_PPC64 */
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