| /* |
| * Copyright (C) 2012,2013 - 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/linkage.h> |
| |
| #include <asm/assembler.h> |
| #include <asm/kvm_arm.h> |
| #include <asm/kvm_mmu.h> |
| |
| .text |
| .pushsection .hyp.idmap.text, "ax" |
| |
| .align 11 |
| |
| ENTRY(__kvm_hyp_init) |
| ventry __invalid // Synchronous EL2t |
| ventry __invalid // IRQ EL2t |
| ventry __invalid // FIQ EL2t |
| ventry __invalid // Error EL2t |
| |
| ventry __invalid // Synchronous EL2h |
| ventry __invalid // IRQ EL2h |
| ventry __invalid // FIQ EL2h |
| ventry __invalid // Error EL2h |
| |
| ventry __do_hyp_init // Synchronous 64-bit EL1 |
| ventry __invalid // IRQ 64-bit EL1 |
| ventry __invalid // FIQ 64-bit EL1 |
| ventry __invalid // Error 64-bit EL1 |
| |
| ventry __invalid // Synchronous 32-bit EL1 |
| ventry __invalid // IRQ 32-bit EL1 |
| ventry __invalid // FIQ 32-bit EL1 |
| ventry __invalid // Error 32-bit EL1 |
| |
| __invalid: |
| b . |
| |
| /* |
| * x0: HYP boot pgd |
| * x1: HYP pgd |
| * x2: HYP stack |
| * x3: HYP vectors |
| */ |
| __do_hyp_init: |
| |
| msr ttbr0_el2, x0 |
| |
| mrs x4, tcr_el1 |
| ldr x5, =TCR_EL2_MASK |
| and x4, x4, x5 |
| ldr x5, =TCR_EL2_FLAGS |
| orr x4, x4, x5 |
| msr tcr_el2, x4 |
| |
| ldr x4, =VTCR_EL2_FLAGS |
| /* |
| * Read the PARange bits from ID_AA64MMFR0_EL1 and set the PS bits in |
| * VTCR_EL2. |
| */ |
| mrs x5, ID_AA64MMFR0_EL1 |
| bfi x4, x5, #16, #3 |
| msr vtcr_el2, x4 |
| |
| mrs x4, mair_el1 |
| msr mair_el2, x4 |
| isb |
| |
| /* Invalidate the stale TLBs from Bootloader */ |
| tlbi alle2 |
| dsb sy |
| |
| mrs x4, sctlr_el2 |
| and x4, x4, #SCTLR_EL2_EE // preserve endianness of EL2 |
| ldr x5, =SCTLR_EL2_FLAGS |
| orr x4, x4, x5 |
| msr sctlr_el2, x4 |
| isb |
| |
| /* MMU is now enabled. Get ready for the trampoline dance */ |
| ldr x4, =TRAMPOLINE_VA |
| adr x5, target |
| bfi x4, x5, #0, #PAGE_SHIFT |
| br x4 |
| |
| target: /* We're now in the trampoline code, switch page tables */ |
| msr ttbr0_el2, x1 |
| isb |
| |
| /* Invalidate the old TLBs */ |
| tlbi alle2 |
| dsb sy |
| |
| /* Set the stack and new vectors */ |
| kern_hyp_va x2 |
| mov sp, x2 |
| kern_hyp_va x3 |
| msr vbar_el2, x3 |
| |
| /* Hello, World! */ |
| eret |
| ENDPROC(__kvm_hyp_init) |
| |
| .ltorg |
| |
| .popsection |
