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0be049083a
UEFI binaries should be executed in EL2 or EL1 even if U-Boot is started in EL3. Provide a unit test. Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
47 lines
830 B
C
47 lines
830 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Check current exception level on ARMv8.
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*/
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#include <efi_loader.h>
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#include <efi_selftest.h>
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/**
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* current_exception_level()
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*
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* Return: current exception level, 0 - 3
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*/
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static unsigned int current_exception_level(void)
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{
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unsigned long el;
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asm volatile (
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"MRS %0, CurrentEL"
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: "=r" (el) : : );
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return (el >> 2) & 0x3;
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}
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/**
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* execute() - execute test
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*
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* Check that the exception level is not EL3.
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*/
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static int execute(void)
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{
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unsigned int el = current_exception_level();
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efi_st_printf("Exception level EL%u\n", el);
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if (el != 1 && el != 2) {
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efi_st_error("EL1 or EL2 expected");
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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(el) = {
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.name = "exception level",
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.phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,
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.execute = execute,
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};
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