1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/*
 3 * Copyright (C) 2012 Freescale Semiconductor, Inc.
 4 */
 5
 6#include <linux/threads.h>
 7#include <asm/epapr_hcalls.h>
 8#include <asm/reg.h>
 9#include <asm/page.h>
10#include <asm/cputable.h>
11#include <asm/thread_info.h>
12#include <asm/ppc_asm.h>
13#include <asm/asm-compat.h>
14#include <asm/asm-offsets.h>
15#include <asm/export.h>
16
17#ifndef CONFIG_PPC64
18/* epapr_ev_idle() was derived from e500_idle() */
19_GLOBAL(epapr_ev_idle)
20	PPC_LL	r4, TI_LOCAL_FLAGS(r2)	/* set napping bit */
21	ori	r4, r4,_TLF_NAPPING	/* so when we take an exception */
22	PPC_STL	r4, TI_LOCAL_FLAGS(r2)	/* it will return to our caller */
23
24	wrteei	1
25
26idle_loop:
27	LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE))
28
29.global epapr_ev_idle_start
30epapr_ev_idle_start:
31	li	r3, -1
32	nop
33	nop
34	nop
35
36	/*
37	 * Guard against spurious wakeups from a hypervisor --
38	 * only interrupt will cause us to return to LR due to
39	 * _TLF_NAPPING.
40	 */
41	b	idle_loop
42#endif
43
44/* Hypercall entry point. Will be patched with device tree instructions. */
45.global epapr_hypercall_start
46epapr_hypercall_start:
47	li	r3, -1
48	nop
49	nop
50	nop
51	blr
52EXPORT_SYMBOL(epapr_hypercall_start)

 1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/*
 3 * Copyright (C) 2012 Freescale Semiconductor, Inc.
 4 */
 5
 6#include <linux/threads.h>
 7#include <asm/epapr_hcalls.h>
 8#include <asm/reg.h>
 9#include <asm/page.h>
10#include <asm/cputable.h>
11#include <asm/thread_info.h>
12#include <asm/ppc_asm.h>
13#include <asm/asm-compat.h>
14#include <asm/asm-offsets.h>
15#include <asm/export.h>
16
17#ifndef CONFIG_PPC64
18/* epapr_ev_idle() was derived from e500_idle() */
19_GLOBAL(epapr_ev_idle)
20	PPC_LL	r4, TI_LOCAL_FLAGS(r2)	/* set napping bit */
21	ori	r4, r4,_TLF_NAPPING	/* so when we take an exception */
22	PPC_STL	r4, TI_LOCAL_FLAGS(r2)	/* it will return to our caller */
23
24	wrteei	1
25
26idle_loop:
27	LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE))
28
29.global epapr_ev_idle_start
30epapr_ev_idle_start:
31	li	r3, -1
32	nop
33	nop
34	nop
35
36	/*
37	 * Guard against spurious wakeups from a hypervisor --
38	 * only interrupt will cause us to return to LR due to
39	 * _TLF_NAPPING.
40	 */
41	b	idle_loop
42#endif
43
44/* Hypercall entry point. Will be patched with device tree instructions. */
45.global epapr_hypercall_start
46epapr_hypercall_start:
47	li	r3, -1
48	nop
49	nop
50	nop
51	blr
52EXPORT_SYMBOL(epapr_hypercall_start)