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
20#ifndef CONFIG_PPC64
21/* epapr_ev_idle() was derived from e500_idle() */
22_GLOBAL(epapr_ev_idle)
23	CURRENT_THREAD_INFO(r3, r1)
24	PPC_LL	r4, TI_LOCAL_FLAGS(r3)	/* set napping bit */
25	ori	r4, r4,_TLF_NAPPING	/* so when we take an exception */
26	PPC_STL	r4, TI_LOCAL_FLAGS(r3)	/* it will return to our caller */
27
28	wrteei	1
29
30idle_loop:
31	LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE))
32
33.global epapr_ev_idle_start
34epapr_ev_idle_start:
35	li	r3, -1
36	nop
37	nop
38	nop
39
40	/*
41	 * Guard against spurious wakeups from a hypervisor --
42	 * only interrupt will cause us to return to LR due to
43	 * _TLF_NAPPING.
44	 */
45	b	idle_loop
46#endif
47
48/* Hypercall entry point. Will be patched with device tree instructions. */
49.global epapr_hypercall_start
50epapr_hypercall_start:
51	li	r3, -1
52	nop
53	nop
54	nop
55	blr
56