1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (C) 2012 Freescale Semiconductor, Inc. 4 */ 5 6 #include <linux/export.h> 7 #include <linux/threads.h> 8 #include <asm/epapr_hcalls.h> 9 #include <asm/reg.h> 10 #include <asm/page.h> 11 #include <asm/cputable.h> 12 #include <asm/thread_info.h> 13 #include <asm/ppc_asm.h> 14 #include <asm/asm-compat.h> 15 #include <asm/asm-offsets.h> 16 17 #ifndef CONFIG_PPC64 18 /* epapr_ev_idle() was derived from e500_idle() */ 19 _GLOBAL(epapr_ev_idle) 20 PPC_LL r4, TI_LOCAL_FLAGS(r2) /* set napping bit */ 21 ori r4, r4,_TLF_NAPPING /* so when we take an exception */ 22 PPC_STL r4, TI_LOCAL_FLAGS(r2) /* it will return to our caller */ 23 24 #ifdef CONFIG_BOOKE 25 wrteei 1 26 #else 27 mfmsr r4 28 ori r4, r4, MSR_EE 29 mtmsr r4 30 #endif 31 32 idle_loop: 33 LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE)) 34 35 .global epapr_ev_idle_start 36 epapr_ev_idle_start: 37 li r3, -1 38 nop 39 nop 40 nop 41 42 /* 43 * Guard against spurious wakeups from a hypervisor -- 44 * only interrupt will cause us to return to LR due to 45 * _TLF_NAPPING. 46 */ 47 b idle_loop 48 #endif 49 50 /* Hypercall entry point. Will be patched with device tree instructions. */ 51 .global epapr_hypercall_start 52 epapr_hypercall_start: 53 li r3, -1 54 nop 55 nop 56 nop 57 blr 58 EXPORT_SYMBOL(epapr_hypercall_start)
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