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