diff options
Diffstat (limited to 'arch/powerpc/kernel/epapr_hcalls.S')
| -rw-r--r-- | arch/powerpc/kernel/epapr_hcalls.S | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/epapr_hcalls.S b/arch/powerpc/kernel/epapr_hcalls.S new file mode 100644 index 000000000..69a912550 --- /dev/null +++ b/arch/powerpc/kernel/epapr_hcalls.S @@ -0,0 +1,52 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2012 Freescale Semiconductor, Inc. + */ + +#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> +#include <asm/export.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 */ + + wrteei 1 + +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) |