23 lines
648 B
ArmAsm
23 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)
|