| /* 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) |
