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 * call standard for the ARM 64-bit architectu
36 * passed in x0, the second in x1, the third i
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 i
44 * hypercall tag.
45 *
46 * Parameter structs passed to hypercalls are
47 * the ARM 64-bit EABI standard.
48 */
49
50 #include <linux/linkage.h>
51 #include <asm/assembler.h>
52 #include <asm/asm-uaccess.h>
53 #include <xen/interface/xen.h>
54
55
56 #define XEN_IMM 0xEA1
57
58 #define HYPERCALL_SIMPLE(hypercall)
59 SYM_FUNC_START(HYPERVISOR_##hypercall)
60 mov x16, #__HYPERVISOR_##hypercall;
61 hvc XEN_IMM;
62 ret;
63 SYM_FUNC_END(HYPERVISOR_##hypercall)
64
65 #define HYPERCALL0 HYPERCALL_SIMPLE
66 #define HYPERCALL1 HYPERCALL_SIMPLE
67 #define HYPERCALL2 HYPERCALL_SIMPLE
68 #define HYPERCALL3 HYPERCALL_SIMPLE
69 #define HYPERCALL4 HYPERCALL_SIMPLE
70 #define HYPERCALL5 HYPERCALL_SIMPLE
71
72 .text
73
74 HYPERCALL2(xen_version);
75 HYPERCALL3(console_io);
76 HYPERCALL3(grant_table_op);
77 HYPERCALL2(sched_op);
78 HYPERCALL2(event_channel_op);
79 HYPERCALL2(hvm_op);
80 HYPERCALL2(memory_op);
81 HYPERCALL2(physdev_op);
82 HYPERCALL3(vcpu_op);
83 HYPERCALL1(platform_op_raw);
84 HYPERCALL2(multicall);
85 HYPERCALL2(vm_assist);
86 HYPERCALL3(dm_op);
87
88 SYM_FUNC_START(privcmd_call)
89 mov x16, x0
90 mov x0, x1
91 mov x1, x2
92 mov x2, x3
93 mov x3, x4
94 mov x4, x5
95 /*
96 * Privcmd calls are issued by the use
97 * enable access to TTBR0_EL1 as the h
98 * translations to user memory via AT
99 * instructions are not affected by th
100 * need the explicit uaccess_enable/di
101 * is enabled (it implies that hardwar
102 */
103 uaccess_ttbr0_enable x6, x7, x8
104 hvc XEN_IMM
105
106 /*
107 * Disable userspace access from kerne
108 */
109 uaccess_ttbr0_disable x6, x7
110 ret
111 SYM_FUNC_END(privcmd_call);
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