The 'el' command displays the current exception level of the processor on the aarch64 architecture.
This information is needed to analyze problems in the EFI subsystem.
Signed-off-by: Heinrich Schuchardt xypron.glpk@gmx.de --- cmd/Kconfig | 7 +++++++ cmd/Makefile | 1 + cmd/el.c | 25 +++++++++++++++++++++++++ 3 files changed, 33 insertions(+) create mode 100644 cmd/el.c
diff --git a/cmd/Kconfig b/cmd/Kconfig index 7ed3c9c3b3..cfad07432e 100644 --- a/cmd/Kconfig +++ b/cmd/Kconfig @@ -1373,6 +1373,13 @@ config CMD_DISPLAY displayed on a simple board-specific display. Implement display_putc() to use it.
+config CMD_EL + bool "el - display processor exception level" + depends on ARM64 + help + Enable the 'el' command which displays the exception level of the + processor. + config CMD_LED bool "led" default y if LED diff --git a/cmd/Makefile b/cmd/Makefile index d9cdaf6064..63e3afd56b 100644 --- a/cmd/Makefile +++ b/cmd/Makefile @@ -47,6 +47,7 @@ endif obj-$(CONFIG_CMD_DISPLAY) += display.o obj-$(CONFIG_CMD_DTIMG) += dtimg.o obj-$(CONFIG_CMD_ECHO) += echo.o +obj-$(CONFIG_CMD_EL) += el.o obj-$(CONFIG_ENV_IS_IN_EEPROM) += eeprom.o obj-$(CONFIG_CMD_EEPROM) += eeprom.o obj-$(CONFIG_EFI_STUB) += efi.o diff --git a/cmd/el.c b/cmd/el.c new file mode 100644 index 0000000000..57081c36f2 --- /dev/null +++ b/cmd/el.c @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * The 'el' command prints the current exception level + * + * Copyright (c) 2018, Heinrich Schuchardt xypron.glpk@gmx.de + */ +#include <common.h> +#include <command.h> +#include <asm/system.h> + +static int do_el(cmd_tbl_t *cmdtp, int flag, int argc, + char * const argv[]) +{ + printf("processor exception level: EL%d\n", current_el()); + return CMD_RET_SUCCESS; +} + +#ifdef CONFIG_SYS_LONGHELP +static char el_help_text[] = ""; +#endif + +U_BOOT_CMD_COMPLETE + (el, 2, 0, do_el, + "display processor exception level", + el_help_text, NULL);