aboutsummaryrefslogtreecommitdiff log msg author committer range
path: root/arch/arm64/kernel/hyp-stub.S
blob: a272f335c289dcb5f52144c815edf6938757a218 (plain)
 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110  /* * Hypervisor stub * * Copyright (C) 2012 ARM Ltd. * Author: Marc Zyngier * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include #include #include #include .text .align 11 ENTRY(__hyp_stub_vectors) ventry el2_sync_invalid // Synchronous EL2t ventry el2_irq_invalid // IRQ EL2t ventry el2_fiq_invalid // FIQ EL2t ventry el2_error_invalid // Error EL2t ventry el2_sync_invalid // Synchronous EL2h ventry el2_irq_invalid // IRQ EL2h ventry el2_fiq_invalid // FIQ EL2h ventry el2_error_invalid // Error EL2h ventry el1_sync // Synchronous 64-bit EL1 ventry el1_irq_invalid // IRQ 64-bit EL1 ventry el1_fiq_invalid // FIQ 64-bit EL1 ventry el1_error_invalid // Error 64-bit EL1 ventry el1_sync_invalid // Synchronous 32-bit EL1 ventry el1_irq_invalid // IRQ 32-bit EL1 ventry el1_fiq_invalid // FIQ 32-bit EL1 ventry el1_error_invalid // Error 32-bit EL1 ENDPROC(__hyp_stub_vectors) .align 11 el1_sync: mrs x1, esr_el2 lsr x1, x1, #26 cmp x1, #0x16 b.ne 2f // Not an HVC trap cbz x0, 1f msr vbar_el2, x0 // Set vbar_el2 b 2f 1: mrs x0, vbar_el2 // Return vbar_el2 2: eret ENDPROC(el1_sync) .macro invalid_vector label \label: b \label ENDPROC(\label) .endm invalid_vector el2_sync_invalid invalid_vector el2_irq_invalid invalid_vector el2_fiq_invalid invalid_vector el2_error_invalid invalid_vector el1_sync_invalid invalid_vector el1_irq_invalid invalid_vector el1_fiq_invalid invalid_vector el1_error_invalid /* * __hyp_set_vectors: Call this after boot to set the initial hypervisor * vectors as part of hypervisor installation. On an SMP system, this should * be called on each CPU. * * x0 must be the physical address of the new vector table, and must be * 2KB aligned. * * Before calling this, you must check that the stub hypervisor is installed * everywhere, by waiting for any secondary CPUs to be brought up and then * checking that is_hyp_mode_available() is true. * * If not, there is a pre-existing hypervisor, some CPUs failed to boot, or * something else went wrong... in such cases, trying to install a new * hypervisor is unlikely to work as desired. * * When you call into your shiny new hypervisor, sp_el2 will contain junk, * so you will need to set that to something sensible at the new hypervisor's * initialisation entry point. */ ENTRY(__hyp_get_vectors) mov x0, xzr // fall through ENTRY(__hyp_set_vectors) hvc #0 ret ENDPROC(__hyp_get_vectors) ENDPROC(__hyp_set_vectors)