101 lines
2.2 KiB
ArmAsm
101 lines
2.2 KiB
ArmAsm
/*
|
|
* 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>
|
|
#include <asm/epapr_hcalls.h>
|
|
|
|
/* 64-bit version only for now */
|
|
#ifdef CONFIG_PPC64
|
|
|
|
.macro BOOK3E_IDLE name loop
|
|
_GLOBAL(\name)
|
|
/* 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...).
|
|
*/
|
|
lbz r3,PACAIRQHAPPENED(r13)
|
|
cmpwi cr0,r3,0
|
|
bnelr
|
|
|
|
/* Now we are going to mark ourselves as soft and hard enabled 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
|
|
addi r1,r1,128
|
|
#endif
|
|
li r0,1
|
|
stb r0,PACASOFTIRQEN(r13)
|
|
|
|
/* Interrupts will make use return to LR, so get something we want
|
|
* in there
|
|
*/
|
|
bl 1f
|
|
|
|
/* And return (interrupts are on) */
|
|
ld r0,16(r1)
|
|
mtlr r0
|
|
blr
|
|
|
|
1: /* Let's set the _TLF_NAPPING flag so interrupts make us return
|
|
* to the right spot
|
|
*/
|
|
CURRENT_THREAD_INFO(r11, r1)
|
|
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
|
|
\loop
|
|
|
|
.endm
|
|
|
|
.macro BOOK3E_IDLE_LOOP
|
|
1:
|
|
PPC_WAIT(0)
|
|
b 1b
|
|
.endm
|
|
|
|
/* epapr_ev_idle_start below is patched with the proper hcall
|
|
opcodes during kernel initialization */
|
|
.macro EPAPR_EV_IDLE_LOOP
|
|
idle_loop:
|
|
LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE))
|
|
|
|
.global epapr_ev_idle_start
|
|
epapr_ev_idle_start:
|
|
li r3, -1
|
|
nop
|
|
nop
|
|
nop
|
|
b idle_loop
|
|
.endm
|
|
|
|
BOOK3E_IDLE epapr_ev_idle EPAPR_EV_IDLE_LOOP
|
|
|
|
BOOK3E_IDLE book3e_idle BOOK3E_IDLE_LOOP
|
|
|
|
#endif /* CONFIG_PPC64 */
|