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