| Marc Zyngier | 712c6ff | 2012-10-19 17:46:27 +0100 | [diff] [blame] | 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) |
