mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-13 16:37:30 +00:00
78f90aaeec
The UEFI spec mandates that unaligned memory access should be enabled if supported by the CPU architecture. This patch implements the function unaligned_access() to reset the aligned access flag in the system control register (SCTLR). It is called when the bootefi command is invoked. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> [agraf: fix SPDX identifier] Signed-off-by: Alexander Graf <agraf@suse.de>
22 lines
648 B
ArmAsm
22 lines
648 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* Routines to access the system control register
|
|
*
|
|
* Copyright (c) 2018 Heinrich Schuchardt
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
|
|
/*
|
|
* void allow_unaligned(void) - allow unaligned access
|
|
*
|
|
* This routine clears the aligned flag in the system control register.
|
|
* After calling this routine unaligned access does no longer lead to a
|
|
* data abort but is handled by the CPU.
|
|
*/
|
|
ENTRY(allow_unaligned)
|
|
mrc p15, 0, r0, c1, c0, 0 @ load system control register
|
|
bic r0, r0, #2 @ clear aligned flag
|
|
mcr p15, 0, r0, c1, c0, 0 @ write system control register
|
|
bx lr @ return
|
|
ENDPROC(allow_unaligned)
|