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1 | /****************************************************************************** |
2 | * hypercall.S | |
3 | * | |
4 | * Xen hypercall wrappers | |
5 | * | |
6 | * Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Citrix, 2012 | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License version 2 | |
10 | * as published by the Free Software Foundation; or, when distributed | |
11 | * separately from the Linux kernel or incorporated into other | |
12 | * software packages, subject to the following license: | |
13 | * | |
14 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
15 | * of this source file (the "Software"), to deal in the Software without | |
16 | * restriction, including without limitation the rights to use, copy, modify, | |
17 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
18 | * and to permit persons to whom the Software is furnished to do so, subject to | |
19 | * the following conditions: | |
20 | * | |
21 | * The above copyright notice and this permission notice shall be included in | |
22 | * all copies or substantial portions of the Software. | |
23 | * | |
24 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
25 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
26 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
27 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
28 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
29 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
30 | * IN THE SOFTWARE. | |
31 | */ | |
32 | ||
33 | /* | |
34 | * The Xen hypercall calling convention is very similar to the procedure | |
35 | * call standard for the ARM 64-bit architecture: the first parameter is | |
36 | * passed in x0, the second in x1, the third in x2, the fourth in x3 and | |
37 | * the fifth in x4. | |
38 | * | |
39 | * The hypercall number is passed in x16. | |
40 | * | |
41 | * The return value is in x0. | |
42 | * | |
43 | * The hvc ISS is required to be 0xEA1, that is the Xen specific ARM | |
44 | * hypercall tag. | |
45 | * | |
46 | * Parameter structs passed to hypercalls are laid out according to | |
47 | * the ARM 64-bit EABI standard. | |
48 | */ | |
49 | ||
50 | #include <linux/linkage.h> | |
51 | #include <asm/assembler.h> | |
52 | #include <xen/interface/xen.h> | |
53 | ||
54 | ||
55 | #define XEN_IMM 0xEA1 | |
56 | ||
57 | #define HYPERCALL_SIMPLE(hypercall) \ | |
58 | ENTRY(HYPERVISOR_##hypercall) \ | |
59 | mov x16, #__HYPERVISOR_##hypercall; \ | |
60 | hvc XEN_IMM; \ | |
61 | ret; \ | |
62 | ENDPROC(HYPERVISOR_##hypercall) | |
63 | ||
64 | #define HYPERCALL0 HYPERCALL_SIMPLE | |
65 | #define HYPERCALL1 HYPERCALL_SIMPLE | |
66 | #define HYPERCALL2 HYPERCALL_SIMPLE | |
67 | #define HYPERCALL3 HYPERCALL_SIMPLE | |
68 | #define HYPERCALL4 HYPERCALL_SIMPLE | |
69 | #define HYPERCALL5 HYPERCALL_SIMPLE | |
70 | ||
71 | .text | |
72 | ||
73 | HYPERCALL2(xen_version); | |
74 | HYPERCALL3(console_io); | |
75 | HYPERCALL3(grant_table_op); | |
76 | HYPERCALL2(sched_op); | |
77 | HYPERCALL2(event_channel_op); | |
78 | HYPERCALL2(hvm_op); | |
79 | HYPERCALL2(memory_op); | |
80 | HYPERCALL2(physdev_op); | |
81 | HYPERCALL3(vcpu_op); | |
176455e9 | 82 | HYPERCALL1(tmem_op); |
5e40704e | 83 | HYPERCALL2(multicall); |
aa42aa13 SS |
84 | |
85 | ENTRY(privcmd_call) | |
86 | mov x16, x0 | |
87 | mov x0, x1 | |
88 | mov x1, x2 | |
89 | mov x2, x3 | |
90 | mov x3, x4 | |
91 | mov x4, x5 | |
92 | hvc XEN_IMM | |
93 | ret | |
94 | ENDPROC(privcmd_call); |