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aa2466d2 SS |
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 ARM | |
35 | * procedure calling convention: the first paramter is passed in r0, the | |
36 | * second in r1, the third in r2 and the fourth in r3. Considering that | |
37 | * Xen hypercalls have 5 arguments at most, the fifth paramter is passed | |
38 | * in r4, differently from the procedure calling convention of using the | |
39 | * stack for that case. | |
40 | * | |
41 | * The hypercall number is passed in r12. | |
42 | * | |
43 | * The return value is in r0. | |
44 | * | |
45 | * The hvc ISS is required to be 0xEA1, that is the Xen specific ARM | |
46 | * hypercall tag. | |
47 | */ | |
48 | ||
49 | #include <linux/linkage.h> | |
50 | #include <asm/assembler.h> | |
c8d258a7 | 51 | #include <asm/opcodes-virt.h> |
aa2466d2 SS |
52 | #include <xen/interface/xen.h> |
53 | ||
54 | ||
c8d258a7 | 55 | #define XEN_IMM 0xEA1 |
aa2466d2 SS |
56 | |
57 | #define HYPERCALL_SIMPLE(hypercall) \ | |
58 | ENTRY(HYPERVISOR_##hypercall) \ | |
59 | mov r12, #__HYPERVISOR_##hypercall; \ | |
c8d258a7 | 60 | __HVC(XEN_IMM); \ |
6ebbf2ce | 61 | ret lr; \ |
aa2466d2 SS |
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 | ||
70 | #define HYPERCALL5(hypercall) \ | |
71 | ENTRY(HYPERVISOR_##hypercall) \ | |
72 | stmdb sp!, {r4} \ | |
73 | ldr r4, [sp, #4] \ | |
74 | mov r12, #__HYPERVISOR_##hypercall; \ | |
c8d258a7 | 75 | __HVC(XEN_IMM); \ |
aa2466d2 | 76 | ldm sp!, {r4} \ |
6ebbf2ce | 77 | ret lr \ |
aa2466d2 SS |
78 | ENDPROC(HYPERVISOR_##hypercall) |
79 | ||
80 | .text | |
81 | ||
82 | HYPERCALL2(xen_version); | |
83 | HYPERCALL3(console_io); | |
84 | HYPERCALL3(grant_table_op); | |
85 | HYPERCALL2(sched_op); | |
86 | HYPERCALL2(event_channel_op); | |
87 | HYPERCALL2(hvm_op); | |
88 | HYPERCALL2(memory_op); | |
89 | HYPERCALL2(physdev_op); | |
ea0af613 | 90 | HYPERCALL3(vcpu_op); |
176455e9 | 91 | HYPERCALL1(tmem_op); |
72d39c69 | 92 | HYPERCALL1(platform_op_raw); |
5e40704e | 93 | HYPERCALL2(multicall); |
aa2466d2 SS |
94 | |
95 | ENTRY(privcmd_call) | |
96 | stmdb sp!, {r4} | |
97 | mov r12, r0 | |
98 | mov r0, r1 | |
99 | mov r1, r2 | |
100 | mov r2, r3 | |
101 | ldr r3, [sp, #8] | |
0b61f2c0 JG |
102 | /* |
103 | * Privcmd calls are issued by the userspace. We need to allow the | |
104 | * kernel to access the userspace memory before issuing the hypercall. | |
105 | */ | |
106 | uaccess_enable r4 | |
107 | ||
108 | /* r4 is loaded now as we use it as scratch register before */ | |
aa2466d2 | 109 | ldr r4, [sp, #4] |
c8d258a7 | 110 | __HVC(XEN_IMM) |
0b61f2c0 JG |
111 | |
112 | /* | |
113 | * Disable userspace access from kernel. This is fine to do it | |
114 | * unconditionally as no set_fs(KERNEL_DS)/set_fs(get_ds()) is | |
115 | * called before. | |
116 | */ | |
117 | uaccess_disable r4 | |
118 | ||
aa2466d2 | 119 | ldm sp!, {r4} |
6ebbf2ce | 120 | ret lr |
aa2466d2 | 121 | ENDPROC(privcmd_call); |