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| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/u-boot/arch/arm/cpu/arm11/sctlr.S | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/u-boot/arch/arm/cpu/arm11/sctlr.S')
| -rw-r--r-- | roms/u-boot/arch/arm/cpu/arm11/sctlr.S | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/roms/u-boot/arch/arm/cpu/arm11/sctlr.S b/roms/u-boot/arch/arm/cpu/arm11/sctlr.S new file mode 100644 index 000000000..74a7fc4a2 --- /dev/null +++ b/roms/u-boot/arch/arm/cpu/arm11/sctlr.S @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Routines to access the system control register + * + * Copyright (c) 2019 Heinrich Schuchardt + */ + +#include <linux/linkage.h> + +/* + * void allow_unaligned(void) - allow unaligned access + * + * This routine sets the enable unaligned data support flag and clears the + * aligned flag in the system control register. + * After calling this routine unaligned access does no longer leads to a + * data abort or undefined behavior but is handled by the CPU. + * For details see the "ARM Architecture Reference Manual" for ARMv6. + */ +ENTRY(allow_unaligned) + mrc p15, 0, r0, c1, c0, 0 @ load system control register + orr r0, r0, #1 << 22 @ set unaligned data support flag + bic r0, r0, #2 @ clear aligned flag + mcr p15, 0, r0, c1, c0, 0 @ write system control register + bx lr @ return +ENDPROC(allow_unaligned) |