1 /*********************************************
2 * hypercall.S
3 *
4 * Xen hypercall wrappers
5 *
6 * Stefano Stabellini <stefano.stabellini@eu.ci
7 *
8 * This program is free software; you can redi
9 * modify it under the terms of the GNU Genera
10 * as published by the Free Software Foundatio
11 * separately from the Linux kernel or incorpo
12 * software packages, subject to the following
13 *
14 * Permission is hereby granted, free of charg
15 * of this source file (the "Software"), to de
16 * restriction, including without limitation t
17 * merge, publish, distribute, sublicense, and
18 * and to permit persons to whom the Software
19 * the following conditions:
20 *
21 * The above copyright notice and this permiss
22 * all copies or substantial portions of the S
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT W
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE W
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINF
27 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT
29 * FROM, OUT OF OR IN CONNECTION WITH THE SOFT
30 * IN THE SOFTWARE.
31 */
32
33 /*
34 * The Xen hypercall calling convention is ver
35 * procedure calling convention: the first par
36 * second in r1, the third in r2 and the fourt
37 * Xen hypercalls have 5 arguments at most, th
38 * in r4, differently from the procedure calli
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 i
46 * hypercall tag.
47 */
48
49 #include <linux/linkage.h>
50 #include <asm/assembler.h>
51 #include <asm/opcodes-virt.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 r12, #__HYPERVISOR_##hypercall;
60 __HVC(XEN_IMM);
61 ret lr;
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;
75 __HVC(XEN_IMM);
76 ldm sp!, {r4}
77 ret lr
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);
90 HYPERCALL3(vcpu_op);
91 HYPERCALL1(platform_op_raw);
92 HYPERCALL2(multicall);
93 HYPERCALL2(vm_assist);
94 HYPERCALL3(dm_op);
95
96 ENTRY(privcmd_call)
97 stmdb sp!, {r4}
98 mov r12, r0
99 mov r0, r1
100 mov r1, r2
101 mov r2, r3
102 ldr r3, [sp, #8]
103 /*
104 * Privcmd calls are issued by the use
105 * kernel to access the userspace memo
106 */
107 uaccess_enable r4
108
109 /* r4 is loaded now as we use it as sc
110 ldr r4, [sp, #4]
111 __HVC(XEN_IMM)
112
113 /*
114 * Disable userspace access from kerne
115 * unconditionally as no set_fs(KERNEL
116 */
117 uaccess_disable r4
118
119 ldm sp!, {r4}
120 ret lr
121 ENDPROC(privcmd_call);
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