From 92b0e8dcae99fea39f167b07063818581a83b1c3 Mon Sep 17 00:00:00 2001 From: Matt DeVillier Date: Mon, 23 Dec 2019 16:08:37 -0600 Subject: drivers/generic/cbfs-serial: Add driver to read serial from CBFS Add a new driver to support reading a board serial number from a text file in CBFS and injecting into the SMBIOS tables. Allow driver to be selected at the .config level and not require inclusion at the board level. Signed-off-by: Matt DeVillier Change-Id: Ieae39f39ab36e5b1f240383b7cf47681d9a311af Reviewed-on: https://review.coreboot.org/c/coreboot/+/37917 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth --- src/drivers/generic/cbfs-serial/Kconfig | 6 ++++ src/drivers/generic/cbfs-serial/Makefile.inc | 1 + src/drivers/generic/cbfs-serial/cbfs-serial.c | 50 +++++++++++++++++++++++++++ 3 files changed, 57 insertions(+) create mode 100644 src/drivers/generic/cbfs-serial/Kconfig create mode 100644 src/drivers/generic/cbfs-serial/Makefile.inc create mode 100644 src/drivers/generic/cbfs-serial/cbfs-serial.c diff --git a/src/drivers/generic/cbfs-serial/Kconfig b/src/drivers/generic/cbfs-serial/Kconfig new file mode 100644 index 0000000000..209c242dba --- /dev/null +++ b/src/drivers/generic/cbfs-serial/Kconfig @@ -0,0 +1,6 @@ +config DRIVERS_GENERIC_CBFS_SERIAL + bool "Serial number in CBFS" + default n + help + Enable this option to read the board serial number from a + text file located in CBFS. diff --git a/src/drivers/generic/cbfs-serial/Makefile.inc b/src/drivers/generic/cbfs-serial/Makefile.inc new file mode 100644 index 0000000000..163d439ba9 --- /dev/null +++ b/src/drivers/generic/cbfs-serial/Makefile.inc @@ -0,0 +1 @@ +ramstage-$(CONFIG_DRIVERS_GENERIC_CBFS_SERIAL) += cbfs-serial.c diff --git a/src/drivers/generic/cbfs-serial/cbfs-serial.c b/src/drivers/generic/cbfs-serial/cbfs-serial.c new file mode 100644 index 0000000000..ee3e36620c --- /dev/null +++ b/src/drivers/generic/cbfs-serial/cbfs-serial.c @@ -0,0 +1,50 @@ +/* + * This file is part of the coreboot project. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include + + +#define MAX_SERIAL_LENGTH 0x100 + +const char *smbios_mainboard_serial_number(void) +{ + static char serial_number[MAX_SERIAL_LENGTH + 1] = {0}; + struct cbfsf file; + + if (serial_number[0] != 0) + return serial_number; + + if (cbfs_boot_locate(&file, "serial_number", NULL) == 0) { + struct region_device cbfs_region; + size_t serial_len; + + cbfs_file_data(&cbfs_region, &file); + + serial_len = region_device_sz(&cbfs_region); + if (serial_len <= MAX_SERIAL_LENGTH) { + if (rdev_readat(&cbfs_region, serial_number, 0, + serial_len) == serial_len) { + serial_number[serial_len] = 0; + return serial_number; + } + } + } + + strncpy(serial_number, CONFIG_MAINBOARD_SERIAL_NUMBER, + MAX_SERIAL_LENGTH); + + return serial_number; +} -- cgit v1.2.3