121 lines
2.9 KiB
ArmAsm
121 lines
2.9 KiB
ArmAsm
|
/* SPDX-License-Identifier: GPL-2.0-only */
|
||
|
|
/*
|
||
|
|
* Hypervisor stub
|
||
|
|
*
|
||
|
|
* Copyright (C) 2012 ARM Ltd.
|
||
|
|
* Author: Marc Zyngier <marc.zyngier@arm.com>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/linkage.h>
|
||
|
|
#include <linux/irqchip/arm-gic-v3.h>
|
||
|
|
|
||
|
|
#include <asm/assembler.h>
|
||
|
|
#include <asm/kvm_arm.h>
|
||
|
|
#include <asm/kvm_asm.h>
|
||
|
|
#include <asm/ptrace.h>
|
||
|
|
#include <asm/virt.h>
|
||
|
|
|
||
|
|
.text
|
||
|
|
.pushsection .hyp.text, "ax"
|
||
|
|
|
||
|
|
.align 11
|
||
|
|
|
||
|
|
ENTRY(__hyp_stub_vectors)
|
||
|
|
ventry el2_sync_invalid // Synchronous EL2t
|
||
|
|
ventry el2_irq_invalid // IRQ EL2t
|
||
|
|
ventry el2_fiq_invalid // FIQ EL2t
|
||
|
|
ventry el2_error_invalid // Error EL2t
|
||
|
|
|
||
|
|
ventry el2_sync_invalid // Synchronous EL2h
|
||
|
|
ventry el2_irq_invalid // IRQ EL2h
|
||
|
|
ventry el2_fiq_invalid // FIQ EL2h
|
||
|
|
ventry el2_error_invalid // Error EL2h
|
||
|
|
|
||
|
|
ventry el1_sync // Synchronous 64-bit EL1
|
||
|
|
ventry el1_irq_invalid // IRQ 64-bit EL1
|
||
|
|
ventry el1_fiq_invalid // FIQ 64-bit EL1
|
||
|
|
ventry el1_error_invalid // Error 64-bit EL1
|
||
|
|
|
||
|
|
ventry el1_sync_invalid // Synchronous 32-bit EL1
|
||
|
|
ventry el1_irq_invalid // IRQ 32-bit EL1
|
||
|
|
ventry el1_fiq_invalid // FIQ 32-bit EL1
|
||
|
|
ventry el1_error_invalid // Error 32-bit EL1
|
||
|
|
ENDPROC(__hyp_stub_vectors)
|
||
|
|
|
||
|
|
.align 11
|
||
|
|
|
||
|
|
el1_sync:
|
||
|
|
cmp x0, #HVC_SET_VECTORS
|
||
|
|
b.ne 2f
|
||
|
|
msr vbar_el2, x1
|
||
|
|
b 9f
|
||
|
|
|
||
|
|
2: cmp x0, #HVC_SOFT_RESTART
|
||
|
|
b.ne 3f
|
||
|
|
mov x0, x2
|
||
|
|
mov x2, x4
|
||
|
|
mov x4, x1
|
||
|
|
mov x1, x3
|
||
|
|
br x4 // no return
|
||
|
|
|
||
|
|
3: cmp x0, #HVC_RESET_VECTORS
|
||
|
|
beq 9f // Nothing to reset!
|
||
|
|
|
||
|
|
/* Someone called kvm_call_hyp() against the hyp-stub... */
|
||
|
|
ldr x0, =HVC_STUB_ERR
|
||
|
|
eret
|
||
|
|
|
||
|
|
9: mov x0, xzr
|
||
|
|
eret
|
||
|
|
ENDPROC(el1_sync)
|
||
|
|
|
||
|
|
.macro invalid_vector label
|
||
|
|
\label:
|
||
|
|
b \label
|
||
|
|
ENDPROC(\label)
|
||
|
|
.endm
|
||
|
|
|
||
|
|
invalid_vector el2_sync_invalid
|
||
|
|
invalid_vector el2_irq_invalid
|
||
|
|
invalid_vector el2_fiq_invalid
|
||
|
|
invalid_vector el2_error_invalid
|
||
|
|
invalid_vector el1_sync_invalid
|
||
|
|
invalid_vector el1_irq_invalid
|
||
|
|
invalid_vector el1_fiq_invalid
|
||
|
|
invalid_vector el1_error_invalid
|
||
|
|
|
||
|
|
/*
|
||
|
|
* __hyp_set_vectors: Call this after boot to set the initial hypervisor
|
||
|
|
* vectors as part of hypervisor installation. On an SMP system, this should
|
||
|
|
* be called on each CPU.
|
||
|
|
*
|
||
|
|
* x0 must be the physical address of the new vector table, and must be
|
||
|
|
* 2KB aligned.
|
||
|
|
*
|
||
|
|
* Before calling this, you must check that the stub hypervisor is installed
|
||
|
|
* everywhere, by waiting for any secondary CPUs to be brought up and then
|
||
|
|
* checking that is_hyp_mode_available() is true.
|
||
|
|
*
|
||
|
|
* If not, there is a pre-existing hypervisor, some CPUs failed to boot, or
|
||
|
|
* something else went wrong... in such cases, trying to install a new
|
||
|
|
* hypervisor is unlikely to work as desired.
|
||
|
|
*
|
||
|
|
* When you call into your shiny new hypervisor, sp_el2 will contain junk,
|
||
|
|
* so you will need to set that to something sensible at the new hypervisor's
|
||
|
|
* initialisation entry point.
|
||
|
|
*/
|
||
|
|
|
||
|
|
ENTRY(__hyp_set_vectors)
|
||
|
|
mov x1, x0
|
||
|
|
mov x0, #HVC_SET_VECTORS
|
||
|
|
hvc #0
|
||
|
|
ret
|
||
|
|
ENDPROC(__hyp_set_vectors)
|
||
|
|
|
||
|
|
ENTRY(__hyp_reset_vectors)
|
||
|
|
mov x0, #HVC_RESET_VECTORS
|
||
|
|
hvc #0
|
||
|
|
ret
|
||
|
|
ENDPROC(__hyp_reset_vectors)
|