1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * Copyright (C) 2012 - Virtual Open Systems and Columbia University 4 * Author: Christoffer Dall <c.dall@virtualopensystems.com> 5 */ 6 7#include <linux/linkage.h> 8 9 .text 10 11/******************************************************************** 12 * Call function in Hyp mode 13 * 14 * 15 * unsigned long kvm_call_hyp(void *hypfn, ...); 16 * 17 * This is not really a variadic function in the classic C-way and care must 18 * be taken when calling this to ensure parameters are passed in registers 19 * only, since the stack will change between the caller and the callee. 20 * 21 * Call the function with the first argument containing a pointer to the 22 * function you wish to call in Hyp mode, and subsequent arguments will be 23 * passed as r0, r1, and r2 (a maximum of 3 arguments in addition to the 24 * function pointer can be passed). The function being called must be mapped 25 * in Hyp mode (see init_hyp_mode in arch/arm/kvm/arm.c). Return values are 26 * passed in r0 (strictly 32bit). 27 * 28 * The calling convention follows the standard AAPCS: 29 * r0 - r3: caller save 30 * r12: caller save 31 * rest: callee save 32 */ 33ENTRY(__kvm_call_hyp) 34 hvc #0 35 bx lr 36ENDPROC(__kvm_call_hyp) 37