/* 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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