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https://github.com/brain-hackers/u-boot-brain
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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>
23 lines
648 B
ArmAsm
23 lines
648 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Routines to access the system control register
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*
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* Copyright (c) 2018 Heinrich Schuchardt
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*/
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#include <linux/linkage.h>
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/*
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* void allow_unaligned(void) - allow unaligned access
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*
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* This routine clears the aligned flag in the system control register.
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* After calling this routine unaligned access does no longer lead to a
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* data abort but is handled by the CPU.
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*/
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ENTRY(allow_unaligned)
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mrc p15, 0, r0, c1, c0, 0 @ load system control register
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bic r0, r0, #2 @ clear aligned flag
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mcr p15, 0, r0, c1, c0, 0 @ write system control register
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bx lr @ return
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ENDPROC(allow_unaligned)
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