1/*
2 * Copyright (C) 2012 Freescale Semiconductor, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 */
9
10#include <linux/threads.h>
11#include <asm/epapr_hcalls.h>
12#include <asm/reg.h>
13#include <asm/page.h>
14#include <asm/cputable.h>
15#include <asm/thread_info.h>
16#include <asm/ppc_asm.h>
17#include <asm/asm-compat.h>
18#include <asm/asm-offsets.h>
19#include <asm/export.h>
20
21#ifndef CONFIG_PPC64
22/* epapr_ev_idle() was derived from e500_idle() */
23_GLOBAL(epapr_ev_idle)
24	CURRENT_THREAD_INFO(r3, r1)
25	PPC_LL	r4, TI_LOCAL_FLAGS(r3)	/* set napping bit */
26	ori	r4, r4,_TLF_NAPPING	/* so when we take an exception */
27	PPC_STL	r4, TI_LOCAL_FLAGS(r3)	/* it will return to our caller */
28
29	wrteei	1
30
31idle_loop:
32	LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE))
33
34.global epapr_ev_idle_start
35epapr_ev_idle_start:
36	li	r3, -1
37	nop
38	nop
39	nop
40
41	/*
42	 * Guard against spurious wakeups from a hypervisor --
43	 * only interrupt will cause us to return to LR due to
44	 * _TLF_NAPPING.
45	 */
46	b	idle_loop
47#endif
48
49/* Hypercall entry point. Will be patched with device tree instructions. */
50.global epapr_hypercall_start
51epapr_hypercall_start:
52	li	r3, -1
53	nop
54	nop
55	nop
56	blr
57EXPORT_SYMBOL(epapr_hypercall_start)
58