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d94d71cb | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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2 | /* |
3 | * Copyright (C) 2012 - Virtual Open Systems and Columbia University | |
4 | * Author: Christoffer Dall <c.dall@virtualopensystems.com> | |
749cf76c | 5 | */ |
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6 | |
7 | #include <linux/linkage.h> | |
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8 | |
9 | .text | |
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10 | |
11 | /******************************************************************** | |
12 | * Call function in Hyp mode | |
13 | * | |
14 | * | |
b57cd6f6 | 15 | * unsigned long kvm_call_hyp(void *hypfn, ...); |
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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 | |
b57cd6f6 | 26 | * passed in r0 (strictly 32bit). |
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27 | * |
28 | * The calling convention follows the standard AAPCS: | |
29 | * r0 - r3: caller save | |
30 | * r12: caller save | |
31 | * rest: callee save | |
32 | */ | |
d18232ea | 33 | ENTRY(__kvm_call_hyp) |
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34 | hvc #0 |
35 | bx lr | |
d18232ea | 36 | ENDPROC(__kvm_call_hyp) |