forked from Minki/linux
2874c5fd28
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
185 lines
4.6 KiB
ArmAsm
185 lines
4.6 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright 2018, IBM Corporation.
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*
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* This file contains general idle entry/exit functions to save
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* and restore stack and NVGPRs which allows C code to call idle
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* states that lose GPRs, and it will return transparently with
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* SRR1 wakeup reason return value.
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*
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* The platform / CPU caller must ensure SPRs and any other non-GPR
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* state is saved and restored correctly, handle KVM, interrupts, etc.
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*/
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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#include <asm/ppc-opcode.h>
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#include <asm/cpuidle.h>
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/*
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* Desired PSSCR in r3
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*
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* No state will be lost regardless of wakeup mechanism (interrupt or NIA).
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*
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* An EC=0 type wakeup will return with a value of 0. SRESET wakeup (which can
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* happen with xscom SRESET and possibly MCE) may clobber volatiles except LR,
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* and must blr, to return to caller with r3 set according to caller's expected
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* return code (for Book3S/64 that is SRR1).
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*/
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_GLOBAL(isa300_idle_stop_noloss)
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mtspr SPRN_PSSCR,r3
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PPC_STOP
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li r3,0
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blr
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/*
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* Desired PSSCR in r3
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*
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* GPRs may be lost, so they are saved here. Wakeup is by interrupt only.
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* The SRESET wakeup returns to this function's caller by calling
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* idle_return_gpr_loss with r3 set to desired return value.
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*
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* A wakeup without GPR loss may alteratively be handled as in
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* isa300_idle_stop_noloss and blr directly, as an optimisation.
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*
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* The caller is responsible for saving/restoring SPRs, MSR, timebase,
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* etc.
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*/
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_GLOBAL(isa300_idle_stop_mayloss)
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mtspr SPRN_PSSCR,r3
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std r1,PACAR1(r13)
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mflr r4
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mfcr r5
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/* use stack red zone rather than a new frame for saving regs */
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std r2,-8*0(r1)
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std r14,-8*1(r1)
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std r15,-8*2(r1)
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std r16,-8*3(r1)
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std r17,-8*4(r1)
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std r18,-8*5(r1)
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std r19,-8*6(r1)
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std r20,-8*7(r1)
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std r21,-8*8(r1)
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std r22,-8*9(r1)
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std r23,-8*10(r1)
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std r24,-8*11(r1)
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std r25,-8*12(r1)
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std r26,-8*13(r1)
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std r27,-8*14(r1)
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std r28,-8*15(r1)
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std r29,-8*16(r1)
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std r30,-8*17(r1)
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std r31,-8*18(r1)
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std r4,-8*19(r1)
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std r5,-8*20(r1)
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/* 168 bytes */
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PPC_STOP
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b . /* catch bugs */
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/*
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* Desired return value in r3
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*
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* The idle wakeup SRESET interrupt can call this after calling
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* to return to the idle sleep function caller with r3 as the return code.
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*
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* This must not be used if idle was entered via a _noloss function (use
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* a simple blr instead).
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*/
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_GLOBAL(idle_return_gpr_loss)
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ld r1,PACAR1(r13)
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ld r4,-8*19(r1)
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ld r5,-8*20(r1)
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mtlr r4
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mtcr r5
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/*
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* KVM nap requires r2 to be saved, rather than just restoring it
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* from PACATOC. This could be avoided for that less common case
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* if KVM saved its r2.
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*/
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ld r2,-8*0(r1)
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ld r14,-8*1(r1)
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ld r15,-8*2(r1)
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ld r16,-8*3(r1)
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ld r17,-8*4(r1)
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ld r18,-8*5(r1)
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ld r19,-8*6(r1)
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ld r20,-8*7(r1)
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ld r21,-8*8(r1)
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ld r22,-8*9(r1)
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ld r23,-8*10(r1)
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ld r24,-8*11(r1)
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ld r25,-8*12(r1)
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ld r26,-8*13(r1)
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ld r27,-8*14(r1)
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ld r28,-8*15(r1)
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ld r29,-8*16(r1)
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ld r30,-8*17(r1)
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ld r31,-8*18(r1)
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blr
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/*
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* This is the sequence required to execute idle instructions, as
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* specified in ISA v2.07 (and earlier). MSR[IR] and MSR[DR] must be 0.
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*
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* The 0(r1) slot is used to save r2 in isa206, so use that here.
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*/
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#define IDLE_STATE_ENTER_SEQ_NORET(IDLE_INST) \
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/* Magic NAP/SLEEP/WINKLE mode enter sequence */ \
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std r2,0(r1); \
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ptesync; \
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ld r2,0(r1); \
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236: cmpd cr0,r2,r2; \
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bne 236b; \
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IDLE_INST; \
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b . /* catch bugs */
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/*
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* Desired instruction type in r3
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*
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* GPRs may be lost, so they are saved here. Wakeup is by interrupt only.
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* The SRESET wakeup returns to this function's caller by calling
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* idle_return_gpr_loss with r3 set to desired return value.
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*
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* A wakeup without GPR loss may alteratively be handled as in
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* isa300_idle_stop_noloss and blr directly, as an optimisation.
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*
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* The caller is responsible for saving/restoring SPRs, MSR, timebase,
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* etc.
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*
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* This must be called in real-mode (MSR_IDLE).
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*/
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_GLOBAL(isa206_idle_insn_mayloss)
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std r1,PACAR1(r13)
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mflr r4
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mfcr r5
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/* use stack red zone rather than a new frame for saving regs */
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std r2,-8*0(r1)
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std r14,-8*1(r1)
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std r15,-8*2(r1)
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std r16,-8*3(r1)
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std r17,-8*4(r1)
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std r18,-8*5(r1)
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std r19,-8*6(r1)
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std r20,-8*7(r1)
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std r21,-8*8(r1)
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std r22,-8*9(r1)
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std r23,-8*10(r1)
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std r24,-8*11(r1)
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std r25,-8*12(r1)
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std r26,-8*13(r1)
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std r27,-8*14(r1)
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std r28,-8*15(r1)
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std r29,-8*16(r1)
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std r30,-8*17(r1)
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std r31,-8*18(r1)
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std r4,-8*19(r1)
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std r5,-8*20(r1)
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cmpwi r3,PNV_THREAD_NAP
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bne 1f
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IDLE_STATE_ENTER_SEQ_NORET(PPC_NAP)
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1: cmpwi r3,PNV_THREAD_SLEEP
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bne 2f
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IDLE_STATE_ENTER_SEQ_NORET(PPC_SLEEP)
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2: IDLE_STATE_ENTER_SEQ_NORET(PPC_WINKLE)
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