linux/arch/powerpc/kernel/idle_book3e.S
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
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>
2019-05-30 11:26:32 -07:00

104 lines
2.1 KiB
ArmAsm

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright 2010 IBM Corp, Benjamin Herrenschmidt <benh@kernel.crashing.org>
*
* Generic idle routine for Book3E processors
*/
#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>
#include <asm/hw_irq.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
bne 2f
/* 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,IRQS_ENABLED
stb r0,PACAIRQSOFTMASK(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
*/
ld r11, PACACURRENT(r13)
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
2:
lbz r10,PACAIRQHAPPENED(r13)
ori r10,r10,PACA_IRQ_HARD_DIS
stb r10,PACAIRQHAPPENED(r13)
blr
.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 */