According to the UEFI spec unaligned memory access should be enabled on CPUs supporting it. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Alexander Graf <agraf@suse.de>lime2-spi
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/*
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* efi_selftest_unaligned |
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* |
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* Copyright (c) 2018 Heinrich Schuchardt <xypron.glpk@gmx.de> |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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* |
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* Test unaligned memory access on ARMv7. |
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*/ |
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#include <efi_selftest.h> |
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struct aligned_buffer { |
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char a[8] __aligned(8); |
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}; |
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/*
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* Return an u32 at a give address. |
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* If the address is not four byte aligned, an unaligned memory access |
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* occurs. |
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* |
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* @addr: address to read |
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* @return: value at the address |
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*/ |
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static inline u32 deref(u32 *addr) |
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{ |
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int ret; |
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asm( |
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"ldr %[out], [%[in]]\n\t" |
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: [out] "=r" (ret) |
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: [in] "r" (addr) |
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); |
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return ret; |
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} |
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/*
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* Execute unit test. |
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* An unaligned memory access is executed. The result is checked. |
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* |
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* @return: EFI_ST_SUCCESS for success |
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*/ |
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static int execute(void) |
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{ |
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struct aligned_buffer buf = { |
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{0, 1, 2, 3, 4, 5, 6, 7}, |
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}; |
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void *v = &buf; |
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u32 r = 0; |
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/* Read an unaligned address */ |
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r = deref(v + 1); |
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/* UEFI only supports low endian systems */ |
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if (r != 0x04030201) { |
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efi_st_error("Unaligned access failed"); |
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return EFI_ST_FAILURE; |
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} |
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return EFI_ST_SUCCESS; |
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} |
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EFI_UNIT_TEST(unaligned) = { |
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.name = "unaligned memory access", |
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.phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT, |
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.execute = execute, |
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}; |
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