vgic-v2-switch.S
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/*
* 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 <linux/irqchip/arm-gic.h>
#include <asm/assembler.h>
#include <asm/memory.h>
#include <asm/asm-offsets.h>
#include <asm/kvm.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_arm.h>
#include <asm/kvm_mmu.h>
.text
.pushsection .hyp.text, "ax"
/*
* Save the VGIC CPU state into memory
* x0: Register pointing to VCPU struct
* Do not corrupt x1!!!
*/
ENTRY(__save_vgic_v2_state)
__save_vgic_v2_state:
/* Get VGIC VCTRL base into x2 */
ldr x2, [x0, #VCPU_KVM]
kern_hyp_va x2
ldr x2, [x2, #KVM_VGIC_VCTRL]
kern_hyp_va x2
cbz x2, 2f // disabled
/* Compute the address of struct vgic_cpu */
add x3, x0, #VCPU_VGIC_CPU
/* Save all interesting registers */
ldr w5, [x2, #GICH_VMCR]
ldr w6, [x2, #GICH_MISR]
ldr w7, [x2, #GICH_EISR0]
ldr w8, [x2, #GICH_EISR1]
ldr w9, [x2, #GICH_ELRSR0]
ldr w10, [x2, #GICH_ELRSR1]
ldr w11, [x2, #GICH_APR]
CPU_BE( rev w5, w5 )
CPU_BE( rev w6, w6 )
CPU_BE( rev w7, w7 )
CPU_BE( rev w8, w8 )
CPU_BE( rev w9, w9 )
CPU_BE( rev w10, w10 )
CPU_BE( rev w11, w11 )
str w5, [x3, #VGIC_V2_CPU_VMCR]
str w6, [x3, #VGIC_V2_CPU_MISR]
CPU_LE( str w7, [x3, #VGIC_V2_CPU_EISR] )
CPU_LE( str w8, [x3, #(VGIC_V2_CPU_EISR + 4)] )
CPU_LE( str w9, [x3, #VGIC_V2_CPU_ELRSR] )
CPU_LE( str w10, [x3, #(VGIC_V2_CPU_ELRSR + 4)] )
CPU_BE( str w7, [x3, #(VGIC_V2_CPU_EISR + 4)] )
CPU_BE( str w8, [x3, #VGIC_V2_CPU_EISR] )
CPU_BE( str w9, [x3, #(VGIC_V2_CPU_ELRSR + 4)] )
CPU_BE( str w10, [x3, #VGIC_V2_CPU_ELRSR] )
str w11, [x3, #VGIC_V2_CPU_APR]
/* Clear GICH_HCR */
str wzr, [x2, #GICH_HCR]
/* Save list registers */
add x2, x2, #GICH_LR0
ldr w4, [x3, #VGIC_CPU_NR_LR]
add x3, x3, #VGIC_V2_CPU_LR
1: ldr w5, [x2], #4
CPU_BE( rev w5, w5 )
str w5, [x3], #4
sub w4, w4, #1
cbnz w4, 1b
2:
ret
ENDPROC(__save_vgic_v2_state)
/*
* Restore the VGIC CPU state from memory
* x0: Register pointing to VCPU struct
*/
ENTRY(__restore_vgic_v2_state)
__restore_vgic_v2_state:
/* Get VGIC VCTRL base into x2 */
ldr x2, [x0, #VCPU_KVM]
kern_hyp_va x2
ldr x2, [x2, #KVM_VGIC_VCTRL]
kern_hyp_va x2
cbz x2, 2f // disabled
/* Compute the address of struct vgic_cpu */
add x3, x0, #VCPU_VGIC_CPU
/* We only restore a minimal set of registers */
ldr w4, [x3, #VGIC_V2_CPU_HCR]
ldr w5, [x3, #VGIC_V2_CPU_VMCR]
ldr w6, [x3, #VGIC_V2_CPU_APR]
CPU_BE( rev w4, w4 )
CPU_BE( rev w5, w5 )
CPU_BE( rev w6, w6 )
str w4, [x2, #GICH_HCR]
str w5, [x2, #GICH_VMCR]
str w6, [x2, #GICH_APR]
/* Restore list registers */
add x2, x2, #GICH_LR0
ldr w4, [x3, #VGIC_CPU_NR_LR]
add x3, x3, #VGIC_V2_CPU_LR
1: ldr w5, [x3], #4
CPU_BE( rev w5, w5 )
str w5, [x2], #4
sub w4, w4, #1
cbnz w4, 1b
2:
ret
ENDPROC(__restore_vgic_v2_state)
.popsection