Commit | Line | Data |
---|---|---|
712c6ff4 MZ |
1 | /* |
2 | * Hypervisor stub | |
3 | * | |
4 | * Copyright (C) 2012 ARM Ltd. | |
5 | * Author: Marc Zyngier <marc.zyngier@arm.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <linux/init.h> | |
21 | #include <linux/linkage.h> | |
22 | ||
23 | #include <asm/assembler.h> | |
24 | #include <asm/ptrace.h> | |
25 | #include <asm/virt.h> | |
26 | ||
27 | .text | |
28 | .align 11 | |
29 | ||
30 | ENTRY(__hyp_stub_vectors) | |
31 | ventry el2_sync_invalid // Synchronous EL2t | |
32 | ventry el2_irq_invalid // IRQ EL2t | |
33 | ventry el2_fiq_invalid // FIQ EL2t | |
34 | ventry el2_error_invalid // Error EL2t | |
35 | ||
36 | ventry el2_sync_invalid // Synchronous EL2h | |
37 | ventry el2_irq_invalid // IRQ EL2h | |
38 | ventry el2_fiq_invalid // FIQ EL2h | |
39 | ventry el2_error_invalid // Error EL2h | |
40 | ||
41 | ventry el1_sync // Synchronous 64-bit EL1 | |
42 | ventry el1_irq_invalid // IRQ 64-bit EL1 | |
43 | ventry el1_fiq_invalid // FIQ 64-bit EL1 | |
44 | ventry el1_error_invalid // Error 64-bit EL1 | |
45 | ||
46 | ventry el1_sync_invalid // Synchronous 32-bit EL1 | |
47 | ventry el1_irq_invalid // IRQ 32-bit EL1 | |
48 | ventry el1_fiq_invalid // FIQ 32-bit EL1 | |
49 | ventry el1_error_invalid // Error 32-bit EL1 | |
50 | ENDPROC(__hyp_stub_vectors) | |
51 | ||
52 | .align 11 | |
53 | ||
54 | el1_sync: | |
55 | mrs x1, esr_el2 | |
56 | lsr x1, x1, #26 | |
57 | cmp x1, #0x16 | |
58 | b.ne 2f // Not an HVC trap | |
59 | cbz x0, 1f | |
60 | msr vbar_el2, x0 // Set vbar_el2 | |
61 | b 2f | |
62 | 1: mrs x0, vbar_el2 // Return vbar_el2 | |
63 | 2: eret | |
64 | ENDPROC(el1_sync) | |
65 | ||
66 | .macro invalid_vector label | |
67 | \label: | |
68 | b \label | |
69 | ENDPROC(\label) | |
70 | .endm | |
71 | ||
72 | invalid_vector el2_sync_invalid | |
73 | invalid_vector el2_irq_invalid | |
74 | invalid_vector el2_fiq_invalid | |
75 | invalid_vector el2_error_invalid | |
76 | invalid_vector el1_sync_invalid | |
77 | invalid_vector el1_irq_invalid | |
78 | invalid_vector el1_fiq_invalid | |
79 | invalid_vector el1_error_invalid | |
80 | ||
81 | /* | |
82 | * __hyp_set_vectors: Call this after boot to set the initial hypervisor | |
83 | * vectors as part of hypervisor installation. On an SMP system, this should | |
84 | * be called on each CPU. | |
85 | * | |
86 | * x0 must be the physical address of the new vector table, and must be | |
87 | * 2KB aligned. | |
88 | * | |
89 | * Before calling this, you must check that the stub hypervisor is installed | |
90 | * everywhere, by waiting for any secondary CPUs to be brought up and then | |
91 | * checking that is_hyp_mode_available() is true. | |
92 | * | |
93 | * If not, there is a pre-existing hypervisor, some CPUs failed to boot, or | |
94 | * something else went wrong... in such cases, trying to install a new | |
95 | * hypervisor is unlikely to work as desired. | |
96 | * | |
97 | * When you call into your shiny new hypervisor, sp_el2 will contain junk, | |
98 | * so you will need to set that to something sensible at the new hypervisor's | |
99 | * initialisation entry point. | |
100 | */ | |
101 | ||
102 | ENTRY(__hyp_get_vectors) | |
103 | mov x0, xzr | |
104 | // fall through | |
105 | ENTRY(__hyp_set_vectors) | |
106 | hvc #0 | |
107 | ret | |
108 | ENDPROC(__hyp_get_vectors) | |
109 | ENDPROC(__hyp_set_vectors) |