/* * Hypervisor stub * * Copyright (C) 2012 ARM Ltd. * Author: Marc Zyngier <marc.zyngier@arm.com> * * 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 <http://www.gnu.org/licenses/>. */ #include <linux/init.h> #include <linux/linkage.h> #include <linux/irqchip/arm-gic-v3.h> #include <asm/assembler.h> #include <asm/ptrace.h> #include <asm/virt.h> .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)