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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> | |
021f6537 | 22 | #include <linux/irqchip/arm-gic-v3.h> |
712c6ff4 MZ |
23 | |
24 | #include <asm/assembler.h> | |
ad72e59f | 25 | #include <asm/kvm_arm.h> |
c94b0cf2 | 26 | #include <asm/kvm_asm.h> |
712c6ff4 MZ |
27 | #include <asm/ptrace.h> |
28 | #include <asm/virt.h> | |
29 | ||
30 | .text | |
31 | .align 11 | |
32 | ||
33 | ENTRY(__hyp_stub_vectors) | |
34 | ventry el2_sync_invalid // Synchronous EL2t | |
35 | ventry el2_irq_invalid // IRQ EL2t | |
36 | ventry el2_fiq_invalid // FIQ EL2t | |
37 | ventry el2_error_invalid // Error EL2t | |
38 | ||
39 | ventry el2_sync_invalid // Synchronous EL2h | |
40 | ventry el2_irq_invalid // IRQ EL2h | |
41 | ventry el2_fiq_invalid // FIQ EL2h | |
42 | ventry el2_error_invalid // Error EL2h | |
43 | ||
44 | ventry el1_sync // Synchronous 64-bit EL1 | |
45 | ventry el1_irq_invalid // IRQ 64-bit EL1 | |
46 | ventry el1_fiq_invalid // FIQ 64-bit EL1 | |
47 | ventry el1_error_invalid // Error 64-bit EL1 | |
48 | ||
49 | ventry el1_sync_invalid // Synchronous 32-bit EL1 | |
50 | ventry el1_irq_invalid // IRQ 32-bit EL1 | |
51 | ventry el1_fiq_invalid // FIQ 32-bit EL1 | |
52 | ventry el1_error_invalid // Error 32-bit EL1 | |
53 | ENDPROC(__hyp_stub_vectors) | |
54 | ||
55 | .align 11 | |
56 | ||
57 | el1_sync: | |
ad72e59f GL |
58 | mrs x30, esr_el2 |
59 | lsr x30, x30, #ESR_ELx_EC_SHIFT | |
60 | ||
61 | cmp x30, #ESR_ELx_EC_HVC64 | |
62 | b.ne 9f // Not an HVC trap | |
63 | ||
64 | cmp x0, #HVC_GET_VECTORS | |
65 | b.ne 1f | |
66 | mrs x0, vbar_el2 | |
67 | b 9f | |
68 | ||
69 | 1: cmp x0, #HVC_SET_VECTORS | |
70 | b.ne 2f | |
71 | msr vbar_el2, x1 | |
72 | b 9f | |
73 | ||
c94b0cf2 JM |
74 | /* Someone called kvm_call_hyp() against the hyp-stub... */ |
75 | 2: mov x0, #ARM_EXCEPTION_HYP_GONE | |
ad72e59f GL |
76 | |
77 | 9: eret | |
712c6ff4 MZ |
78 | ENDPROC(el1_sync) |
79 | ||
80 | .macro invalid_vector label | |
81 | \label: | |
82 | b \label | |
83 | ENDPROC(\label) | |
84 | .endm | |
85 | ||
86 | invalid_vector el2_sync_invalid | |
87 | invalid_vector el2_irq_invalid | |
88 | invalid_vector el2_fiq_invalid | |
89 | invalid_vector el2_error_invalid | |
90 | invalid_vector el1_sync_invalid | |
91 | invalid_vector el1_irq_invalid | |
92 | invalid_vector el1_fiq_invalid | |
93 | invalid_vector el1_error_invalid | |
94 | ||
95 | /* | |
96 | * __hyp_set_vectors: Call this after boot to set the initial hypervisor | |
97 | * vectors as part of hypervisor installation. On an SMP system, this should | |
98 | * be called on each CPU. | |
99 | * | |
100 | * x0 must be the physical address of the new vector table, and must be | |
101 | * 2KB aligned. | |
102 | * | |
103 | * Before calling this, you must check that the stub hypervisor is installed | |
104 | * everywhere, by waiting for any secondary CPUs to be brought up and then | |
105 | * checking that is_hyp_mode_available() is true. | |
106 | * | |
107 | * If not, there is a pre-existing hypervisor, some CPUs failed to boot, or | |
108 | * something else went wrong... in such cases, trying to install a new | |
109 | * hypervisor is unlikely to work as desired. | |
110 | * | |
111 | * When you call into your shiny new hypervisor, sp_el2 will contain junk, | |
112 | * so you will need to set that to something sensible at the new hypervisor's | |
113 | * initialisation entry point. | |
114 | */ | |
115 | ||
116 | ENTRY(__hyp_get_vectors) | |
00a44cda | 117 | str lr, [sp, #-16]! |
ad72e59f | 118 | mov x0, #HVC_GET_VECTORS |
712c6ff4 | 119 | hvc #0 |
00a44cda | 120 | ldr lr, [sp], #16 |
712c6ff4 MZ |
121 | ret |
122 | ENDPROC(__hyp_get_vectors) | |
00a44cda JM |
123 | |
124 | ENTRY(__hyp_set_vectors) | |
125 | str lr, [sp, #-16]! | |
ad72e59f GL |
126 | mov x1, x0 |
127 | mov x0, #HVC_SET_VECTORS | |
00a44cda JM |
128 | hvc #0 |
129 | ldr lr, [sp], #16 | |
130 | ret | |
712c6ff4 | 131 | ENDPROC(__hyp_set_vectors) |