| Marc Zyngier | 092bd14 | 2012-12-17 17:07:52 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012,2013 - ARM Ltd |
| 3 | * Author: Marc Zyngier <marc.zyngier@arm.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License, version 2, as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/linkage.h> |
| 19 | |
| 20 | #include <asm/assembler.h> |
| 21 | #include <asm/kvm_arm.h> |
| 22 | #include <asm/kvm_mmu.h> |
| 23 | |
| 24 | .text |
| 25 | .pushsection .hyp.idmap.text, "ax" |
| 26 | |
| 27 | .align 11 |
| 28 | |
| 29 | ENTRY(__kvm_hyp_init) |
| 30 | ventry __invalid // Synchronous EL2t |
| 31 | ventry __invalid // IRQ EL2t |
| 32 | ventry __invalid // FIQ EL2t |
| 33 | ventry __invalid // Error EL2t |
| 34 | |
| 35 | ventry __invalid // Synchronous EL2h |
| 36 | ventry __invalid // IRQ EL2h |
| 37 | ventry __invalid // FIQ EL2h |
| 38 | ventry __invalid // Error EL2h |
| 39 | |
| 40 | ventry __do_hyp_init // Synchronous 64-bit EL1 |
| 41 | ventry __invalid // IRQ 64-bit EL1 |
| 42 | ventry __invalid // FIQ 64-bit EL1 |
| 43 | ventry __invalid // Error 64-bit EL1 |
| 44 | |
| 45 | ventry __invalid // Synchronous 32-bit EL1 |
| 46 | ventry __invalid // IRQ 32-bit EL1 |
| 47 | ventry __invalid // FIQ 32-bit EL1 |
| 48 | ventry __invalid // Error 32-bit EL1 |
| 49 | |
| 50 | __invalid: |
| 51 | b . |
| 52 | |
| 53 | /* |
| 54 | * x0: HYP boot pgd |
| 55 | * x1: HYP pgd |
| 56 | * x2: HYP stack |
| 57 | * x3: HYP vectors |
| 58 | */ |
| 59 | __do_hyp_init: |
| 60 | |
| 61 | msr ttbr0_el2, x0 |
| 62 | |
| 63 | mrs x4, tcr_el1 |
| 64 | ldr x5, =TCR_EL2_MASK |
| 65 | and x4, x4, x5 |
| 66 | ldr x5, =TCR_EL2_FLAGS |
| 67 | orr x4, x4, x5 |
| 68 | msr tcr_el2, x4 |
| 69 | |
| 70 | ldr x4, =VTCR_EL2_FLAGS |
| Radha Mohan Chintakuntla | 87366d8 | 2014-03-07 08:49:25 +0000 | [diff] [blame] | 71 | /* |
| 72 | * Read the PARange bits from ID_AA64MMFR0_EL1 and set the PS bits in |
| 73 | * VTCR_EL2. |
| 74 | */ |
| 75 | mrs x5, ID_AA64MMFR0_EL1 |
| 76 | bfi x4, x5, #16, #3 |
| Marc Zyngier | 092bd14 | 2012-12-17 17:07:52 +0000 | [diff] [blame] | 77 | msr vtcr_el2, x4 |
| 78 | |
| 79 | mrs x4, mair_el1 |
| 80 | msr mair_el2, x4 |
| 81 | isb |
| 82 | |
| Pranavkumar Sawargaonkar | f6edbbf | 2014-07-31 12:23:23 +0530 | [diff] [blame] | 83 | /* Invalidate the stale TLBs from Bootloader */ |
| 84 | tlbi alle2 |
| 85 | dsb sy |
| 86 | |
| Marc Zyngier | 18ea3db | 2013-11-05 18:29:45 +0000 | [diff] [blame] | 87 | mrs x4, sctlr_el2 |
| 88 | and x4, x4, #SCTLR_EL2_EE // preserve endianness of EL2 |
| 89 | ldr x5, =SCTLR_EL2_FLAGS |
| 90 | orr x4, x4, x5 |
| Marc Zyngier | 092bd14 | 2012-12-17 17:07:52 +0000 | [diff] [blame] | 91 | msr sctlr_el2, x4 |
| 92 | isb |
| 93 | |
| 94 | /* MMU is now enabled. Get ready for the trampoline dance */ |
| 95 | ldr x4, =TRAMPOLINE_VA |
| 96 | adr x5, target |
| 97 | bfi x4, x5, #0, #PAGE_SHIFT |
| 98 | br x4 |
| 99 | |
| 100 | target: /* We're now in the trampoline code, switch page tables */ |
| 101 | msr ttbr0_el2, x1 |
| 102 | isb |
| 103 | |
| 104 | /* Invalidate the old TLBs */ |
| 105 | tlbi alle2 |
| 106 | dsb sy |
| 107 | |
| 108 | /* Set the stack and new vectors */ |
| 109 | kern_hyp_va x2 |
| 110 | mov sp, x2 |
| 111 | kern_hyp_va x3 |
| 112 | msr vbar_el2, x3 |
| 113 | |
| 114 | /* Hello, World! */ |
| 115 | eret |
| 116 | ENDPROC(__kvm_hyp_init) |
| 117 | |
| 118 | .ltorg |
| 119 | |
| 120 | .popsection |