| /* SPDX-License-Identifier: GPL-2.0-or-later */ | |
| /* | |
| * Copyright (C) 2012 Freescale Semiconductor, Inc. | |
| */ | |
| #include <linux/export.h> | |
| #include <linux/threads.h> | |
| #include <asm/epapr_hcalls.h> | |
| #include <asm/reg.h> | |
| #include <asm/page.h> | |
| #include <asm/cputable.h> | |
| #include <asm/thread_info.h> | |
| #include <asm/ppc_asm.h> | |
| #include <asm/asm-compat.h> | |
| #include <asm/asm-offsets.h> | |
| #ifndef CONFIG_PPC64 | |
| /* epapr_ev_idle() was derived from e500_idle() */ | |
| _GLOBAL(epapr_ev_idle) | |
| PPC_LL r4, TI_LOCAL_FLAGS(r2) /* set napping bit */ | |
| ori r4, r4,_TLF_NAPPING /* so when we take an exception */ | |
| PPC_STL r4, TI_LOCAL_FLAGS(r2) /* it will return to our caller */ | |
| #ifdef CONFIG_BOOKE | |
| wrteei 1 | |
| #else | |
| mfmsr r4 | |
| ori r4, r4, MSR_EE | |
| mtmsr r4 | |
| #endif | |
| idle_loop: | |
| LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE)) | |
| .global epapr_ev_idle_start | |
| epapr_ev_idle_start: | |
| li r3, -1 | |
| nop | |
| nop | |
| nop | |
| /* | |
| * Guard against spurious wakeups from a hypervisor -- | |
| * only interrupt will cause us to return to LR due to | |
| * _TLF_NAPPING. | |
| */ | |
| b idle_loop | |
| #endif | |
| /* Hypercall entry point. Will be patched with device tree instructions. */ | |
| .global epapr_hypercall_start | |
| epapr_hypercall_start: | |
| li r3, -1 | |
| nop | |
| nop | |
| nop | |
| blr | |
| EXPORT_SYMBOL(epapr_hypercall_start) |