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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>
104 lines
2.1 KiB
ArmAsm
104 lines
2.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright 2010 IBM Corp, Benjamin Herrenschmidt <benh@kernel.crashing.org>
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*
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* Generic idle routine for Book3E processors
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*/
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#include <linux/threads.h>
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#include <asm/reg.h>
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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/processor.h>
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#include <asm/thread_info.h>
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#include <asm/epapr_hcalls.h>
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#include <asm/hw_irq.h>
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/* 64-bit version only for now */
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#ifdef CONFIG_PPC64
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.macro BOOK3E_IDLE name loop
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_GLOBAL(\name)
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/* Save LR for later */
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mflr r0
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std r0,16(r1)
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/* Hard disable interrupts */
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wrteei 0
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/* Now check if an interrupt came in while we were soft disabled
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* since we may otherwise lose it (doorbells etc...).
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*/
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lbz r3,PACAIRQHAPPENED(r13)
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cmpwi cr0,r3,0
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bne 2f
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/* Now we are going to mark ourselves as soft and hard enabled in
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* order to be able to take interrupts while asleep. We inform lockdep
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* of that. We don't actually turn interrupts on just yet tho.
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*/
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#ifdef CONFIG_TRACE_IRQFLAGS
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stdu r1,-128(r1)
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bl trace_hardirqs_on
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addi r1,r1,128
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#endif
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li r0,IRQS_ENABLED
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stb r0,PACAIRQSOFTMASK(r13)
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/* Interrupts will make use return to LR, so get something we want
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* in there
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*/
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bl 1f
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/* And return (interrupts are on) */
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ld r0,16(r1)
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mtlr r0
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blr
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1: /* Let's set the _TLF_NAPPING flag so interrupts make us return
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* to the right spot
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*/
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ld r11, PACACURRENT(r13)
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ld r10,TI_LOCAL_FLAGS(r11)
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ori r10,r10,_TLF_NAPPING
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std r10,TI_LOCAL_FLAGS(r11)
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/* We can now re-enable hard interrupts and go to sleep */
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wrteei 1
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\loop
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2:
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lbz r10,PACAIRQHAPPENED(r13)
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ori r10,r10,PACA_IRQ_HARD_DIS
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stb r10,PACAIRQHAPPENED(r13)
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blr
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.endm
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.macro BOOK3E_IDLE_LOOP
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1:
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PPC_WAIT(0)
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b 1b
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.endm
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/* epapr_ev_idle_start below is patched with the proper hcall
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opcodes during kernel initialization */
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.macro EPAPR_EV_IDLE_LOOP
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idle_loop:
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LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE))
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.global epapr_ev_idle_start
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epapr_ev_idle_start:
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li r3, -1
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nop
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nop
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nop
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b idle_loop
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.endm
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BOOK3E_IDLE epapr_ev_idle EPAPR_EV_IDLE_LOOP
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BOOK3E_IDLE book3e_idle BOOK3E_IDLE_LOOP
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#endif /* CONFIG_PPC64 */
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