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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2012 Freescale Semiconductor, Inc.
*/
#include <linux/export.h>
#include <linux/threads.h>
#include <asm/epapr_hcalls.h>
#include <asm/reg.h>
#include <asm/page.h>
#include <asm/cputable.h>
#include <asm/thread_info.h>
#include <asm/ppc_asm.h>
#include <asm/asm-compat.h>
#include <asm/asm-offsets.h>
#ifndef CONFIG_PPC64
/* epapr_ev_idle() was derived from e500_idle() */
_GLOBAL(epapr_ev_idle)
PPC_LL r4, TI_LOCAL_FLAGS(r2) /* set napping bit */
ori r4, r4,_TLF_NAPPING /* so when we take an exception */
PPC_STL r4, TI_LOCAL_FLAGS(r2) /* it will return to our caller */
#ifdef CONFIG_BOOKE_OR_40x
wrteei 1
#else
mfmsr r4
ori r4, r4, MSR_EE
mtmsr r4
#endif
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
/*
* Guard against spurious wakeups from a hypervisor --
* only interrupt will cause us to return to LR due to
* _TLF_NAPPING.
*/
b idle_loop
#endif
/* Hypercall entry point. Will be patched with device tree instructions. */
.global epapr_hypercall_start
epapr_hypercall_start:
li r3, -1
nop
nop
nop
blr
EXPORT_SYMBOL(epapr_hypercall_start)
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