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// SPDX-License-Identifier: GPL-2.0-only
/*
* Check current exception level on ARMv8.
*/
#include <efi_loader.h>
#include <efi_selftest.h>
/**
* current_exception_level()
*
* Return: current exception level, 0 - 3
*/
static unsigned int current_exception_level(void)
{
unsigned long el;
asm volatile (
"MRS %0, CurrentEL"
: "=r" (el) : : );
return (el >> 2) & 0x3;
}
/**
* execute() - execute test
*
* Check that the exception level is not EL3.
*/
static int execute(void)
{
unsigned int el = current_exception_level();
efi_st_printf("Exception level EL%u\n", el);
if (el != 1 && el != 2) {
efi_st_error("EL1 or EL2 expected");
return EFI_ST_FAILURE;
}
return EFI_ST_SUCCESS;
}
EFI_UNIT_TEST(el) = {
.name = "exception level",
.phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,
.execute = execute,
};
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