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/* SPDX-License-Identifier: GPL-2.0+ */ /* * Routines to access the system control register * * Copyright (c) 2019 Heinrich Schuchardt */ #include <linux/linkage.h> /* * void arm11_arch_cp15_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(arm11_arch_cp15_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(arm11_arch_cp15_allow_unaligned) |