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#include <linux/irqchip/arm-gic-v3.h> 23 24#include <asm/assembler.h> 25#include <asm/kvm_arm.h> 26#include <asm/kvm_asm.h> 27#include <asm/ptrace.h> 28#include <asm/virt.h> 29 30 .text 31 .pushsection .hyp.text, "ax" 32 33 .align 11 34 35ENTRY(__hyp_stub_vectors) 36 ventry el2_sync_invalid // Synchronous EL2t 37 ventry el2_irq_invalid // IRQ EL2t 38 ventry el2_fiq_invalid // FIQ EL2t 39 ventry el2_error_invalid // Error EL2t 40 41 ventry el2_sync_invalid // Synchronous EL2h 42 ventry el2_irq_invalid // IRQ EL2h 43 ventry el2_fiq_invalid // FIQ EL2h 44 ventry el2_error_invalid // Error EL2h 45 46 ventry el1_sync // Synchronous 64-bit EL1 47 ventry el1_irq_invalid // IRQ 64-bit EL1 48 ventry el1_fiq_invalid // FIQ 64-bit EL1 49 ventry el1_error_invalid // Error 64-bit EL1 50 51 ventry el1_sync_invalid // Synchronous 32-bit EL1 52 ventry el1_irq_invalid // IRQ 32-bit EL1 53 ventry el1_fiq_invalid // FIQ 32-bit EL1 54 ventry el1_error_invalid // Error 32-bit EL1 55ENDPROC(__hyp_stub_vectors) 56 57 .align 11 58 59el1_sync: 60 cmp x0, #HVC_SET_VECTORS 61 b.ne 2f 62 msr vbar_el2, x1 63 b 9f 64 652: cmp x0, #HVC_SOFT_RESTART 66 b.ne 3f 67 mov x0, x2 68 mov x2, x4 69 mov x4, x1 70 mov x1, x3 71 br x4 // no return 72 733: cmp x0, #HVC_RESET_VECTORS 74 beq 9f // Nothing to reset! 75 76 /* Someone called kvm_call_hyp() against the hyp-stub... */ 77 ldr x0, =HVC_STUB_ERR 78 eret 79 809: mov x0, xzr 81 eret 82ENDPROC(el1_sync) 83 84.macro invalid_vector label 85\label: 86 b \label 87ENDPROC(\label) 88.endm 89 90 invalid_vector el2_sync_invalid 91 invalid_vector el2_irq_invalid 92 invalid_vector el2_fiq_invalid 93 invalid_vector el2_error_invalid 94 invalid_vector el1_sync_invalid 95 invalid_vector el1_irq_invalid 96 invalid_vector el1_fiq_invalid 97 invalid_vector el1_error_invalid 98 99/* 100 * __hyp_set_vectors: Call this after boot to set the initial hypervisor 101 * vectors as part of hypervisor installation. On an SMP system, this should 102 * be called on each CPU. 103 * 104 * x0 must be the physical address of the new vector table, and must be 105 * 2KB aligned. 106 * 107 * Before calling this, you must check that the stub hypervisor is installed 108 * everywhere, by waiting for any secondary CPUs to be brought up and then 109 * checking that is_hyp_mode_available() is true. 110 * 111 * If not, there is a pre-existing hypervisor, some CPUs failed to boot, or 112 * something else went wrong... in such cases, trying to install a new 113 * hypervisor is unlikely to work as desired. 114 * 115 * When you call into your shiny new hypervisor, sp_el2 will contain junk, 116 * so you will need to set that to something sensible at the new hypervisor's 117 * initialisation entry point. 118 */ 119 120ENTRY(__hyp_set_vectors) 121 mov x1, x0 122 mov x0, #HVC_SET_VECTORS 123 hvc #0 124 ret 125ENDPROC(__hyp_set_vectors) 126 127ENTRY(__hyp_reset_vectors) 128 mov x0, #HVC_RESET_VECTORS 129 hvc #0 130 ret 131ENDPROC(__hyp_reset_vectors) 132