mirror of https://gitee.com/openkylin/linux.git
188 lines
3.8 KiB
ArmAsm
188 lines
3.8 KiB
ArmAsm
/*
|
|
* This file contains the power_save function for Power7 CPUs.
|
|
*
|
|
* 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/processor.h>
|
|
#include <asm/page.h>
|
|
#include <asm/cputable.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/ppc_asm.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/ppc-opcode.h>
|
|
#include <asm/hw_irq.h>
|
|
#include <asm/kvm_book3s_asm.h>
|
|
#include <asm/opal.h>
|
|
|
|
#undef DEBUG
|
|
|
|
/* Idle state entry routines */
|
|
|
|
#define IDLE_STATE_ENTER_SEQ(IDLE_INST) \
|
|
/* Magic NAP/SLEEP/WINKLE mode enter sequence */ \
|
|
std r0,0(r1); \
|
|
ptesync; \
|
|
ld r0,0(r1); \
|
|
1: cmp cr0,r0,r0; \
|
|
bne 1b; \
|
|
IDLE_INST; \
|
|
b .
|
|
|
|
.text
|
|
|
|
/*
|
|
* Pass requested state in r3:
|
|
* 0 - nap
|
|
* 1 - sleep
|
|
*
|
|
* To check IRQ_HAPPENED in r4
|
|
* 0 - don't check
|
|
* 1 - check
|
|
*/
|
|
_GLOBAL(power7_powersave_common)
|
|
/* Use r3 to pass state nap/sleep/winkle */
|
|
/* NAP is a state loss, we create a regs frame on the
|
|
* stack, fill it up with the state we care about and
|
|
* stick a pointer to it in PACAR1. We really only
|
|
* need to save PC, some CR bits and the NV GPRs,
|
|
* but for now an interrupt frame will do.
|
|
*/
|
|
mflr r0
|
|
std r0,16(r1)
|
|
stdu r1,-INT_FRAME_SIZE(r1)
|
|
std r0,_LINK(r1)
|
|
std r0,_NIP(r1)
|
|
|
|
#ifndef CONFIG_SMP
|
|
/* Make sure FPU, VSX etc... are flushed as we may lose
|
|
* state when going to nap mode
|
|
*/
|
|
bl discard_lazy_cpu_state
|
|
#endif /* CONFIG_SMP */
|
|
|
|
/* Hard disable interrupts */
|
|
mfmsr r9
|
|
rldicl r9,r9,48,1
|
|
rotldi r9,r9,16
|
|
mtmsrd r9,1 /* hard-disable interrupts */
|
|
|
|
/* Check if something happened while soft-disabled */
|
|
lbz r0,PACAIRQHAPPENED(r13)
|
|
cmpwi cr0,r0,0
|
|
beq 1f
|
|
cmpwi cr0,r4,0
|
|
beq 1f
|
|
addi r1,r1,INT_FRAME_SIZE
|
|
ld r0,16(r1)
|
|
mtlr r0
|
|
blr
|
|
|
|
1: /* We mark irqs hard disabled as this is the state we'll
|
|
* be in when returning and we need to tell arch_local_irq_restore()
|
|
* about it
|
|
*/
|
|
li r0,PACA_IRQ_HARD_DIS
|
|
stb r0,PACAIRQHAPPENED(r13)
|
|
|
|
/* We haven't lost state ... yet */
|
|
li r0,0
|
|
stb r0,PACA_NAPSTATELOST(r13)
|
|
|
|
/* Continue saving state */
|
|
SAVE_GPR(2, r1)
|
|
SAVE_NVGPRS(r1)
|
|
mfcr r4
|
|
std r4,_CCR(r1)
|
|
std r9,_MSR(r1)
|
|
std r1,PACAR1(r13)
|
|
|
|
_GLOBAL(power7_enter_nap_mode)
|
|
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
|
|
/* Tell KVM we're napping */
|
|
li r4,KVM_HWTHREAD_IN_NAP
|
|
stb r4,HSTATE_HWTHREAD_STATE(r13)
|
|
#endif
|
|
cmpwi cr0,r3,1
|
|
beq 2f
|
|
IDLE_STATE_ENTER_SEQ(PPC_NAP)
|
|
/* No return */
|
|
2: IDLE_STATE_ENTER_SEQ(PPC_SLEEP)
|
|
/* No return */
|
|
|
|
_GLOBAL(power7_idle)
|
|
/* Now check if user or arch enabled NAP mode */
|
|
LOAD_REG_ADDRBASE(r3,powersave_nap)
|
|
lwz r4,ADDROFF(powersave_nap)(r3)
|
|
cmpwi 0,r4,0
|
|
beqlr
|
|
li r3, 1
|
|
/* fall through */
|
|
|
|
_GLOBAL(power7_nap)
|
|
mr r4,r3
|
|
li r3,0
|
|
b power7_powersave_common
|
|
/* No return */
|
|
|
|
_GLOBAL(power7_sleep)
|
|
li r3,1
|
|
li r4,0
|
|
b power7_powersave_common
|
|
/* No return */
|
|
|
|
_GLOBAL(power7_wakeup_tb_loss)
|
|
ld r2,PACATOC(r13);
|
|
ld r1,PACAR1(r13)
|
|
|
|
/* Time base re-sync */
|
|
li r0,OPAL_RESYNC_TIMEBASE
|
|
LOAD_REG_ADDR(r11,opal);
|
|
ld r12,8(r11);
|
|
ld r2,0(r11);
|
|
mtctr r12
|
|
bctrl
|
|
|
|
/* TODO: Check r3 for failure */
|
|
|
|
REST_NVGPRS(r1)
|
|
REST_GPR(2, r1)
|
|
ld r3,_CCR(r1)
|
|
ld r4,_MSR(r1)
|
|
ld r5,_NIP(r1)
|
|
addi r1,r1,INT_FRAME_SIZE
|
|
mtcr r3
|
|
mfspr r3,SPRN_SRR1 /* Return SRR1 */
|
|
mtspr SPRN_SRR1,r4
|
|
mtspr SPRN_SRR0,r5
|
|
rfid
|
|
|
|
_GLOBAL(power7_wakeup_loss)
|
|
ld r1,PACAR1(r13)
|
|
REST_NVGPRS(r1)
|
|
REST_GPR(2, r1)
|
|
ld r3,_CCR(r1)
|
|
ld r4,_MSR(r1)
|
|
ld r5,_NIP(r1)
|
|
addi r1,r1,INT_FRAME_SIZE
|
|
mtcr r3
|
|
mtspr SPRN_SRR1,r4
|
|
mtspr SPRN_SRR0,r5
|
|
rfid
|
|
|
|
_GLOBAL(power7_wakeup_noloss)
|
|
lbz r0,PACA_NAPSTATELOST(r13)
|
|
cmpwi r0,0
|
|
bne power7_wakeup_loss
|
|
ld r1,PACAR1(r13)
|
|
ld r4,_MSR(r1)
|
|
ld r5,_NIP(r1)
|
|
addi r1,r1,INT_FRAME_SIZE
|
|
mtspr SPRN_SRR1,r4
|
|
mtspr SPRN_SRR0,r5
|
|
rfid
|