(/usr/bin/git 2025-03-11, commit: 63aee44)

#include <fcntl.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>

Include dependency graph for machine-id-gen.c:

Macros
#define	S32G_OCOTP_BASE 0x400a4000uL
	Memory-mapped base address of the S32G OCOTP memory controller.

#define	S32G_OCOTP_OFFSET_UID 0x210uL
	Offset to the unique ID shadow registers (2x32-Bit consecutive)

#define	S32G_SIUL21_BASE 0x44010000uL
	Memory-mapped base address of the S32G SIUL2_1 subsystem.

#define	S32G_SIUL21_OFFSET_MIDR1 0x4uL
	Offset to the SIUL2 MCU ID register 1 (MIDR1).

#define	S32G_SIUL21_MCUID_VAL 0x4C200000uL
	Upper 16-Bit of MIDR1 valid for all S32G models.

#define	S32G_SIUL21_MCUID_MASK 0xFFFF0000uL
	Bitmask of upper 16-Bit (for MIDR1 access).

#define	MID_STR_LEN 36
	Length of a 128-Bit UUIDv4 not including the terminating zero.

#define	KERNEL_CMDLINE_PATH "/proc/cmdline"
	Where the (pseudo-)file containing the Kernel command line is.

#define	KERNEL_CMDLINE_MAX_LEN 4096
	Maximum length of the Kernel command line options to be read.

#define	KERNEL_CMDLINE_KEY "systemd.machine_id"
	Kernel command line key to set machine ID.

Functions
static void	crinitPrintUsage (const char *basename)

static int	crinitGetMidKernelCmdLine (char *mid, size_t n)

int	main (int argc, char *argv[])

Macro Definition Documentation

◆ KERNEL_CMDLINE_KEY

#define KERNEL_CMDLINE_KEY "systemd.machine_id"

Kernel command line key to set machine ID.

◆ KERNEL_CMDLINE_MAX_LEN

#define KERNEL_CMDLINE_MAX_LEN 4096

Maximum length of the Kernel command line options to be read.

◆ KERNEL_CMDLINE_PATH

#define KERNEL_CMDLINE_PATH "/proc/cmdline"

Where the (pseudo-)file containing the Kernel command line is.

◆ MID_STR_LEN

#define MID_STR_LEN 36

Length of a 128-Bit UUIDv4 not including the terminating zero.

◆ S32G_OCOTP_BASE

#define S32G_OCOTP_BASE 0x400a4000uL

Memory-mapped base address of the S32G OCOTP memory controller.

◆ S32G_OCOTP_OFFSET_UID

#define S32G_OCOTP_OFFSET_UID 0x210uL

Offset to the unique ID shadow registers (2x32-Bit consecutive)

◆ S32G_SIUL21_BASE

#define S32G_SIUL21_BASE 0x44010000uL

Memory-mapped base address of the S32G SIUL2_1 subsystem.

◆ S32G_SIUL21_MCUID_MASK

#define S32G_SIUL21_MCUID_MASK 0xFFFF0000uL

Bitmask of upper 16-Bit (for MIDR1 access).

◆ S32G_SIUL21_MCUID_VAL

#define S32G_SIUL21_MCUID_VAL 0x4C200000uL

Upper 16-Bit of MIDR1 valid for all S32G models.

◆ S32G_SIUL21_OFFSET_MIDR1

#define S32G_SIUL21_OFFSET_MIDR1 0x4uL

Offset to the SIUL2 MCU ID register 1 (MIDR1).

Function Documentation

◆ crinitGetMidKernelCmdLine()

static int crinitGetMidKernelCmdLine	(	char *	mid,
		size_t	n
	)

static

Tries to get the machine-id from the Kernel command line.

Searches the Kernel command line for a value for KERNEL_CMDLINE_KEY and copies it to mid if found and n is large enough.

Parameters

mid	Return pointer for the machine-id UUID string.
n	Maximum size of the string that can be returned.

Returns: 0 on success, -1 on a general error, and -2 if everything went well but KERNEL_CMDLINE_KEY is not found in the Kernel commandline.

◆ crinitPrintUsage()

static void crinitPrintUsage ( const char * basename )