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