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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/powerpc/kernel/epapr_hcalls.S
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/* SPDX-License-Identifier: GPL-2.0-or-later */

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/*

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 * Copyright (C) 2012 Freescale Semiconductor, Inc.

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 */

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#include <linux/export.h>

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#include <linux/threads.h>

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#include <asm/epapr_hcalls.h>

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#include <asm/reg.h>

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#include <asm/page.h>

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#include <asm/cputable.h>

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#include <asm/thread_info.h>

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#include <asm/ppc_asm.h>

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#include <asm/asm-compat.h>

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#include <asm/asm-offsets.h>

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#ifndef CONFIG_PPC64

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/* epapr_ev_idle() was derived from e500_idle() */

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_GLOBAL(epapr_ev_idle)

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	PPC_LL	r4, TI_LOCAL_FLAGS(r2)	/* set napping bit */

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	ori	r4, r4,_TLF_NAPPING	/* so when we take an exception */

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	PPC_STL	r4, TI_LOCAL_FLAGS(r2)	/* it will return to our caller */

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#ifdef CONFIG_BOOKE

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	wrteei	1

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#else

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	mfmsr	r4

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	ori	r4, r4, MSR_EE

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	mtmsr	r4

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#endif

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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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	/*

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	 * Guard against spurious wakeups from a hypervisor --

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	 * only interrupt will cause us to return to LR due to

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	 * _TLF_NAPPING.

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	 */

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	b	idle_loop

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#endif

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/* Hypercall entry point. Will be patched with device tree instructions. */

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.global epapr_hypercall_start

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epapr_hypercall_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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	blr

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EXPORT_SYMBOL(epapr_hypercall_start)

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