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https://github.com/AsahiLinux/u-boot
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c32248601c
Rename current assembler implementation of allow_unaligned() to v7_arch_cp15_allow_unaligned() and add it into armv7.h header, then add C wrapper of allow_unaligned(). This fixes misbehavior when linking U-Boot on ARMv7a i.MX6Q, where the CPU specific allow_unaligned() implementation was ignored and instead the __weak allow_unaligned() implementation from lib/efi_loader/efi_setup.c was used, which led to "data abort" just before booting Linux via tftp, in efi_dp_from_file() -> path_to_uefi() -> utf16_put() . The problem is triggerd byc7c0ca3767("efi_loader: fix efi_dp_from_file()") . Adding the wrapper fixes the problem. Fixes:78f90aaeec("arm: armv7: allow unaligned memory access") Signed-off-by: Marek Vasut <marex@denx.de>
22 lines
687 B
ArmAsm
22 lines
687 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 v7_arch_cp15_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(v7_arch_cp15_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(v7_arch_cp15_allow_unaligned)
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