mirror of https://gitee.com/openkylin/linux.git
117 lines
2.5 KiB
ArmAsm
117 lines
2.5 KiB
ArmAsm
/*
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* Copyright (C) 2012,2013 - ARM Ltd
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/kvm_arm.h>
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#include <asm/kvm_mmu.h>
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.text
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.pushsection .hyp.idmap.text, "ax"
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.align 11
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ENTRY(__kvm_hyp_init)
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ventry __invalid // Synchronous EL2t
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ventry __invalid // IRQ EL2t
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ventry __invalid // FIQ EL2t
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ventry __invalid // Error EL2t
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ventry __invalid // Synchronous EL2h
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ventry __invalid // IRQ EL2h
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ventry __invalid // FIQ EL2h
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ventry __invalid // Error EL2h
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ventry __do_hyp_init // Synchronous 64-bit EL1
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ventry __invalid // IRQ 64-bit EL1
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ventry __invalid // FIQ 64-bit EL1
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ventry __invalid // Error 64-bit EL1
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ventry __invalid // Synchronous 32-bit EL1
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ventry __invalid // IRQ 32-bit EL1
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ventry __invalid // FIQ 32-bit EL1
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ventry __invalid // Error 32-bit EL1
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__invalid:
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b .
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/*
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* x0: HYP boot pgd
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* x1: HYP pgd
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* x2: HYP stack
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* x3: HYP vectors
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*/
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__do_hyp_init:
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msr ttbr0_el2, x0
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mrs x4, tcr_el1
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ldr x5, =TCR_EL2_MASK
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and x4, x4, x5
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ldr x5, =TCR_EL2_FLAGS
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orr x4, x4, x5
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msr tcr_el2, x4
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ldr x4, =VTCR_EL2_FLAGS
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/*
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* Read the PARange bits from ID_AA64MMFR0_EL1 and set the PS bits in
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* VTCR_EL2.
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*/
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mrs x5, ID_AA64MMFR0_EL1
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bfi x4, x5, #16, #3
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msr vtcr_el2, x4
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mrs x4, mair_el1
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msr mair_el2, x4
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isb
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mrs x4, sctlr_el2
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and x4, x4, #SCTLR_EL2_EE // preserve endianness of EL2
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ldr x5, =SCTLR_EL2_FLAGS
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orr x4, x4, x5
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msr sctlr_el2, x4
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isb
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/* MMU is now enabled. Get ready for the trampoline dance */
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ldr x4, =TRAMPOLINE_VA
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adr x5, target
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bfi x4, x5, #0, #PAGE_SHIFT
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br x4
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target: /* We're now in the trampoline code, switch page tables */
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msr ttbr0_el2, x1
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isb
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/* Invalidate the old TLBs */
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tlbi alle2
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dsb sy
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/* Set the stack and new vectors */
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kern_hyp_va x2
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mov sp, x2
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kern_hyp_va x3
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msr vbar_el2, x3
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/* Hello, World! */
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eret
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ENDPROC(__kvm_hyp_init)
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.ltorg
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.popsection
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