linux/arch/arm64/kernel/hyp-stub.S
Mark Brown 0343a7e463 arm64: kernel: Convert to modern annotations for assembly functions
In an effort to clarify and simplify the annotation of assembly functions
in the kernel new macros have been introduced. These replace ENTRY and
ENDPROC and also add a new annotation for static functions which previously
had no ENTRY equivalent. Update the annotations in the core kernel code to
the new macros.

Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20200501115430.37315-3-broonie@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
2020-05-04 12:46:03 +01:00

121 lines
3.0 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
SYM_CODE_START(__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
SYM_CODE_END(__hyp_stub_vectors)
.align 11
SYM_CODE_START_LOCAL(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... */
mov_q x0, HVC_STUB_ERR
eret
9: mov x0, xzr
eret
SYM_CODE_END(el1_sync)
.macro invalid_vector label
SYM_CODE_START_LOCAL(\label)
b \label
SYM_CODE_END(\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.
*/
SYM_FUNC_START(__hyp_set_vectors)
mov x1, x0
mov x0, #HVC_SET_VECTORS
hvc #0
ret
SYM_FUNC_END(__hyp_set_vectors)
SYM_FUNC_START(__hyp_reset_vectors)
mov x0, #HVC_RESET_VECTORS
hvc #0
ret
SYM_FUNC_END(__hyp_reset_vectors)