| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Copyright (C) 2012 - Virtual Open Systems and Columbia University |
| * Author: Christoffer Dall <c.dall@virtualopensystems.com> |
| */ |
| |
| #include <linux/linkage.h> |
| |
| .text |
| |
| /******************************************************************** |
| * Call function in Hyp mode |
| * |
| * |
| * unsigned long kvm_call_hyp(void *hypfn, ...); |
| * |
| * This is not really a variadic function in the classic C-way and care must |
| * be taken when calling this to ensure parameters are passed in registers |
| * only, since the stack will change between the caller and the callee. |
| * |
| * Call the function with the first argument containing a pointer to the |
| * function you wish to call in Hyp mode, and subsequent arguments will be |
| * passed as r0, r1, and r2 (a maximum of 3 arguments in addition to the |
| * function pointer can be passed). The function being called must be mapped |
| * in Hyp mode (see init_hyp_mode in arch/arm/kvm/arm.c). Return values are |
| * passed in r0 (strictly 32bit). |
| * |
| * The calling convention follows the standard AAPCS: |
| * r0 - r3: caller save |
| * r12: caller save |
| * rest: callee save |
| */ |
| ENTRY(__kvm_call_hyp) |
| hvc #0 |
| bx lr |
| ENDPROC(__kvm_call_hyp) |
