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- /* 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)
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