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 62e1ae9c0SLiu Yu-B13201#include <linux/threads.h> 72f979de8SLiu Yu-B13201#include <asm/epapr_hcalls.h> 82e1ae9c0SLiu Yu-B13201#include <asm/reg.h> 92e1ae9c0SLiu Yu-B13201#include <asm/page.h> 102e1ae9c0SLiu Yu-B13201#include <asm/cputable.h> 112e1ae9c0SLiu Yu-B13201#include <asm/thread_info.h> 122e1ae9c0SLiu Yu-B13201#include <asm/ppc_asm.h> 132f979de8SLiu Yu-B13201#include <asm/asm-compat.h> 142e1ae9c0SLiu Yu-B13201#include <asm/asm-offsets.h> 159445aa1aSAl Viro#include <asm/export.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 242f979de8SLiu Yu-B13201 wrteei 1 252f979de8SLiu Yu-B13201 262f979de8SLiu Yu-B13201idle_loop: 272f979de8SLiu Yu-B13201 LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE)) 282f979de8SLiu Yu-B13201 292f979de8SLiu Yu-B13201.global epapr_ev_idle_start 302f979de8SLiu Yu-B13201epapr_ev_idle_start: 312f979de8SLiu Yu-B13201 li r3, -1 322f979de8SLiu Yu-B13201 nop 332f979de8SLiu Yu-B13201 nop 342f979de8SLiu Yu-B13201 nop 352f979de8SLiu Yu-B13201 362f979de8SLiu Yu-B13201 /* 372f979de8SLiu Yu-B13201 * Guard against spurious wakeups from a hypervisor -- 382f979de8SLiu Yu-B13201 * only interrupt will cause us to return to LR due to 392f979de8SLiu Yu-B13201 * _TLF_NAPPING. 402f979de8SLiu Yu-B13201 */ 412f979de8SLiu Yu-B13201 b idle_loop 42f070986aSStuart Yoder#endif 432f979de8SLiu Yu-B13201 442e1ae9c0SLiu Yu-B13201/* Hypercall entry point. Will be patched with device tree instructions. */ 452e1ae9c0SLiu Yu-B13201.global epapr_hypercall_start 462e1ae9c0SLiu Yu-B13201epapr_hypercall_start: 472e1ae9c0SLiu Yu-B13201 li r3, -1 482e1ae9c0SLiu Yu-B13201 nop 492e1ae9c0SLiu Yu-B13201 nop 502e1ae9c0SLiu Yu-B13201 nop 512e1ae9c0SLiu Yu-B13201 blr 529445aa1aSAl ViroEXPORT_SYMBOL(epapr_hypercall_start) 53