mirror of https://gitee.com/openkylin/linux.git
155 lines
3.6 KiB
ArmAsm
155 lines
3.6 KiB
ArmAsm
/*
|
|
* 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>
|
|
#include <asm/pgtable-hwdef.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
|
|
|
|
#ifndef CONFIG_ARM64_VA_BITS_48
|
|
/*
|
|
* If we are running with VA_BITS < 48, we may be running with an extra
|
|
* level of translation in the ID map. This is only the case if system
|
|
* RAM is out of range for the currently configured page size and number
|
|
* of translation levels, in which case we will also need the extra
|
|
* level for the HYP ID map, or we won't be able to enable the EL2 MMU.
|
|
*
|
|
* However, at EL2, there is only one TTBR register, and we can't switch
|
|
* between translation tables *and* update TCR_EL2.T0SZ at the same
|
|
* time. Bottom line: we need the extra level in *both* our translation
|
|
* tables.
|
|
*
|
|
* So use the same T0SZ value we use for the ID map.
|
|
*/
|
|
ldr_l x5, idmap_t0sz
|
|
bfi x4, x5, TCR_T0SZ_OFFSET, TCR_TxSZ_WIDTH
|
|
#endif
|
|
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
|
|
/*
|
|
* Read the VMIDBits bits from ID_AA64MMFR1_EL1 and set the VS bit in
|
|
* VTCR_EL2.
|
|
*/
|
|
mrs x5, ID_AA64MMFR1_EL1
|
|
ubfx x5, x5, #5, #1
|
|
lsl x5, x5, #VTCR_EL2_VS
|
|
orr x4, x4, x5
|
|
|
|
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
|
|
|
|
/* Skip the trampoline dance if we merged the boot and runtime PGDs */
|
|
cmp x0, x1
|
|
b.eq merged
|
|
|
|
/* 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
|
|
|
|
merged:
|
|
/* 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
|