1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * Copyright (C) 2012,2013 - ARM Ltd 4 * Author: Marc Zyngier <marc.zyngier@arm.com> 5 */ 6 7#include <linux/linkage.h> 8 9#include <asm/alternative.h> 10#include <asm/assembler.h> 11#include <asm/cpufeature.h> 12 13/* 14 * u64 __kvm_call_hyp(void *hypfn, ...); 15 * 16 * This is not really a variadic function in the classic C-way and care must 17 * be taken when calling this to ensure parameters are passed in registers 18 * only, since the stack will change between the caller and the callee. 19 * 20 * Call the function with the first argument containing a pointer to the 21 * function you wish to call in Hyp mode, and subsequent arguments will be 22 * passed as x0, x1, and x2 (a maximum of 3 arguments in addition to the 23 * function pointer can be passed). The function being called must be mapped 24 * in Hyp mode (see init_hyp_mode in arch/arm/kvm/arm.c). Return values are 25 * passed in x0. 26 * 27 * A function pointer with a value less than 0xfff has a special meaning, 28 * and is used to implement hyp stubs in the same way as in 29 * arch/arm64/kernel/hyp_stub.S. 30 */ 31ENTRY(__kvm_call_hyp) 32 hvc #0 33 ret 34ENDPROC(__kvm_call_hyp) 35