mirror of
https://github.com/torvalds/linux.git
synced 2024-11-19 02:21:47 +00:00
439e70e27a
The identity map is mapped as both writeable and executable by the SWAPPER_MM_MMUFLAGS and this is relied upon by the kpti code to manage a synchronisation flag. Update the .pushsection flags to reflect the actual mapping attributes. Reported-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
56 lines
1.4 KiB
ArmAsm
56 lines
1.4 KiB
ArmAsm
/*
|
|
* CPU reset routines
|
|
*
|
|
* Copyright (C) 2001 Deep Blue Solutions Ltd.
|
|
* Copyright (C) 2012 ARM Ltd.
|
|
* Copyright (C) 2015 Huawei Futurewei Technologies.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/sysreg.h>
|
|
#include <asm/virt.h>
|
|
|
|
.text
|
|
.pushsection .idmap.text, "awx"
|
|
|
|
/*
|
|
* __cpu_soft_restart(el2_switch, entry, arg0, arg1, arg2) - Helper for
|
|
* cpu_soft_restart.
|
|
*
|
|
* @el2_switch: Flag to indicate a swich to EL2 is needed.
|
|
* @entry: Location to jump to for soft reset.
|
|
* arg0: First argument passed to @entry.
|
|
* arg1: Second argument passed to @entry.
|
|
* arg2: Third argument passed to @entry.
|
|
*
|
|
* Put the CPU into the same state as it would be if it had been reset, and
|
|
* branch to what would be the reset vector. It must be executed with the
|
|
* flat identity mapping.
|
|
*/
|
|
ENTRY(__cpu_soft_restart)
|
|
/* Clear sctlr_el1 flags. */
|
|
mrs x12, sctlr_el1
|
|
ldr x13, =SCTLR_ELx_FLAGS
|
|
bic x12, x12, x13
|
|
pre_disable_mmu_workaround
|
|
msr sctlr_el1, x12
|
|
isb
|
|
|
|
cbz x0, 1f // el2_switch?
|
|
mov x0, #HVC_SOFT_RESTART
|
|
hvc #0 // no return
|
|
|
|
1: mov x18, x1 // entry
|
|
mov x0, x2 // arg0
|
|
mov x1, x3 // arg1
|
|
mov x2, x4 // arg2
|
|
br x18
|
|
ENDPROC(__cpu_soft_restart)
|
|
|
|
.popsection
|