12874c5fdSThomas Gleixner/* SPDX-License-Identifier: GPL-2.0-or-later */ 22e1ae9c0SLiu Yu-B13201/* 32e1ae9c0SLiu Yu-B13201 * Copyright (C) 2012 Freescale Semiconductor, Inc. 42e1ae9c0SLiu Yu-B13201 */ 52e1ae9c0SLiu Yu-B13201 6*39326182SMasahiro Yamada#include <linux/export.h> 72e1ae9c0SLiu Yu-B13201#include <linux/threads.h> 82f979de8SLiu Yu-B13201#include <asm/epapr_hcalls.h> 92e1ae9c0SLiu Yu-B13201#include <asm/reg.h> 102e1ae9c0SLiu Yu-B13201#include <asm/page.h> 112e1ae9c0SLiu Yu-B13201#include <asm/cputable.h> 122e1ae9c0SLiu Yu-B13201#include <asm/thread_info.h> 132e1ae9c0SLiu Yu-B13201#include <asm/ppc_asm.h> 142f979de8SLiu Yu-B13201#include <asm/asm-compat.h> 152e1ae9c0SLiu Yu-B13201#include <asm/asm-offsets.h> 162e1ae9c0SLiu Yu-B13201 17f070986aSStuart Yoder#ifndef CONFIG_PPC64 182f979de8SLiu Yu-B13201/* epapr_ev_idle() was derived from e500_idle() */ 192f979de8SLiu Yu-B13201_GLOBAL(epapr_ev_idle) 20f7354ccaSChristophe Leroy PPC_LL r4, TI_LOCAL_FLAGS(r2) /* set napping bit */ 212f979de8SLiu Yu-B13201 ori r4, r4,_TLF_NAPPING /* so when we take an exception */ 22f7354ccaSChristophe Leroy PPC_STL r4, TI_LOCAL_FLAGS(r2) /* it will return to our caller */ 232f979de8SLiu Yu-B13201 243c2ce491SChristophe Leroy#ifdef CONFIG_BOOKE_OR_40x 252f979de8SLiu Yu-B13201 wrteei 1 263c2ce491SChristophe Leroy#else 273c2ce491SChristophe Leroy mfmsr r4 283c2ce491SChristophe Leroy ori r4, r4, MSR_EE 293c2ce491SChristophe Leroy mtmsr r4 303c2ce491SChristophe Leroy#endif 312f979de8SLiu Yu-B13201 322f979de8SLiu Yu-B13201idle_loop: 332f979de8SLiu Yu-B13201 LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE)) 342f979de8SLiu Yu-B13201 352f979de8SLiu Yu-B13201.global epapr_ev_idle_start 362f979de8SLiu Yu-B13201epapr_ev_idle_start: 372f979de8SLiu Yu-B13201 li r3, -1 382f979de8SLiu Yu-B13201 nop 392f979de8SLiu Yu-B13201 nop 402f979de8SLiu Yu-B13201 nop 412f979de8SLiu Yu-B13201 422f979de8SLiu Yu-B13201 /* 432f979de8SLiu Yu-B13201 * Guard against spurious wakeups from a hypervisor -- 442f979de8SLiu Yu-B13201 * only interrupt will cause us to return to LR due to 452f979de8SLiu Yu-B13201 * _TLF_NAPPING. 462f979de8SLiu Yu-B13201 */ 472f979de8SLiu Yu-B13201 b idle_loop 48f070986aSStuart Yoder#endif 492f979de8SLiu Yu-B13201 502e1ae9c0SLiu Yu-B13201/* Hypercall entry point. Will be patched with device tree instructions. */ 512e1ae9c0SLiu Yu-B13201.global epapr_hypercall_start 522e1ae9c0SLiu Yu-B13201epapr_hypercall_start: 532e1ae9c0SLiu Yu-B13201 li r3, -1 542e1ae9c0SLiu Yu-B13201 nop 552e1ae9c0SLiu Yu-B13201 nop 562e1ae9c0SLiu Yu-B13201 nop 572e1ae9c0SLiu Yu-B13201 blr 589445aa1aSAl ViroEXPORT_SYMBOL(epapr_hypercall_start) 59