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1 | /* |
2 | * Copyright (C) 2012 - Virtual Open Systems and Columbia University | |
3 | * Author: Christoffer Dall <c.dall@virtualopensystems.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License, version 2, as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
17 | */ | |
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18 | |
19 | #include <linux/linkage.h> | |
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20 | |
21 | .text | |
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22 | |
23 | /******************************************************************** | |
24 | * Call function in Hyp mode | |
25 | * | |
26 | * | |
b57cd6f6 | 27 | * unsigned long kvm_call_hyp(void *hypfn, ...); |
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28 | * |
29 | * This is not really a variadic function in the classic C-way and care must | |
30 | * be taken when calling this to ensure parameters are passed in registers | |
31 | * only, since the stack will change between the caller and the callee. | |
32 | * | |
33 | * Call the function with the first argument containing a pointer to the | |
34 | * function you wish to call in Hyp mode, and subsequent arguments will be | |
35 | * passed as r0, r1, and r2 (a maximum of 3 arguments in addition to the | |
36 | * function pointer can be passed). The function being called must be mapped | |
37 | * in Hyp mode (see init_hyp_mode in arch/arm/kvm/arm.c). Return values are | |
b57cd6f6 | 38 | * passed in r0 (strictly 32bit). |
342cd0ab | 39 | * |
b20c9f29 MZ |
40 | * A function pointer with a value of 0xffffffff has a special meaning, |
41 | * and is used to implement __hyp_get_vectors in the same way as in | |
42 | * arch/arm/kernel/hyp_stub.S. | |
43 | * | |
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44 | * The calling convention follows the standard AAPCS: |
45 | * r0 - r3: caller save | |
46 | * r12: caller save | |
47 | * rest: callee save | |
48 | */ | |
49 | ENTRY(kvm_call_hyp) | |
50 | hvc #0 | |
51 | bx lr | |
b98e2e72 | 52 | ENDPROC(kvm_call_hyp) |