35 lines
1.1 KiB
ArmAsm
35 lines
1.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012,2013 - ARM Ltd
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*/
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#include <linux/linkage.h>
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#include <asm/alternative.h>
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#include <asm/assembler.h>
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#include <asm/cpufeature.h>
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/*
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* u64 __kvm_call_hyp(void *hypfn, ...);
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*
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* This is not really a variadic function in the classic C-way and care must
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* be taken when calling this to ensure parameters are passed in registers
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* only, since the stack will change between the caller and the callee.
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*
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* Call the function with the first argument containing a pointer to the
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* function you wish to call in Hyp mode, and subsequent arguments will be
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* passed as x0, x1, and x2 (a maximum of 3 arguments in addition to the
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* function pointer can be passed). The function being called must be mapped
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* in Hyp mode (see init_hyp_mode in arch/arm/kvm/arm.c). Return values are
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* passed in x0.
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*
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* A function pointer with a value less than 0xfff has a special meaning,
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* and is used to implement hyp stubs in the same way as in
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* arch/arm64/kernel/hyp_stub.S.
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*/
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SYM_FUNC_START(__kvm_call_hyp)
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hvc #0
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ret
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SYM_FUNC_END(__kvm_call_hyp)
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