[PATCH 3/5] cmd: provide command to display SMBIOS information
Heinrich Schuchardt
xypron.glpk at gmx.de
Sat Dec 23 01:44:27 CET 2023
U-Boot can either generated an SMBIOS table or copy it from a prior boot
stage, e.g. QEMU.
Provide a command to display the SMBIOS information.
Currently only type 1 and 2 are translated to human readable text.
Other types may be added later. Currently only a hexdump and the list of
strings is provided for these.
Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
cmd/Kconfig | 7 ++
cmd/Makefile | 1 +
cmd/smbios.c | 191 +++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 199 insertions(+)
create mode 100644 cmd/smbios.c
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 5a7678f0ac..580aeec8ee 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -206,6 +206,13 @@ config CMD_SBI
help
Display information about the SBI implementation.
+config CMD_SMBIOS
+ bool "smbios"
+ depends on SMBIOS
+ default y
+ help
+ Display the SMBIOS information.
+
endmenu
menu "Boot commands"
diff --git a/cmd/Makefile b/cmd/Makefile
index 5ed0e4011d..8a5dfd8ca9 100644
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -168,6 +168,7 @@ obj-$(CONFIG_CMD_SETEXPR) += setexpr.o
obj-$(CONFIG_CMD_SETEXPR_FMT) += printf.o
obj-$(CONFIG_CMD_SPI) += spi.o
obj-$(CONFIG_CMD_STRINGS) += strings.o
+obj-$(CONFIG_CMD_SMBIOS) += smbios.o
obj-$(CONFIG_CMD_SMC) += smccc.o
obj-$(CONFIG_CMD_SYSBOOT) += sysboot.o
obj-$(CONFIG_CMD_STACKPROTECTOR_TEST) += stackprot_test.o
diff --git a/cmd/smbios.c b/cmd/smbios.c
new file mode 100644
index 0000000000..63f908e92c
--- /dev/null
+++ b/cmd/smbios.c
@@ -0,0 +1,191 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * The 'smbios' command displays information from the SMBIOS table.
+ *
+ * Copyright (c) 2023, Heinrich Schuchardt <xypron.glpk at gmx.de>
+ */
+
+#include <command.h>
+#include <hexdump.h>
+#include <mapmem.h>
+#include <smbios.h>
+#include <tables_csum.h>
+#include <asm/global_data.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/**
+ * smbios_get_string() - get SMBIOS string from table
+ *
+ * @table: SMBIOS table
+ * @index: index of the string
+ * Return: address of string, may point to empty string
+ */
+static const char *smbios_get_string(void *table, int index)
+{
+ const char *str = (char *)table +
+ ((struct smbios_header *)table)->length;
+
+ if (!*str)
+ ++str;
+ for (--index; *str && index; --index)
+ str += strlen(str) + 1;
+
+ return str;
+}
+
+static struct smbios_header *next_table(struct smbios_header *table)
+{
+ const char *str;
+
+ if (table->type == SMBIOS_END_OF_TABLE)
+ return NULL;
+
+ str = smbios_get_string(table, 0);
+ return (struct smbios_header *)(++str);
+}
+
+static void smbios_print_generic(struct smbios_header *table)
+{
+ char *str = (char *)table + table->length;
+
+ if (CONFIG_IS_ENABLED(HEXDUMP)) {
+ printf("Header and Data:\n");
+ print_hex_dump("\t", DUMP_PREFIX_OFFSET, 16, 1,
+ table, table->length, false);
+ }
+ if (*str) {
+ printf("Strings:\n");
+ for (int index = 1; *str; ++index) {
+ printf("\tString %u: %s\n", index, str);
+ str += strlen(str) + 1;
+ }
+ }
+}
+
+void smbios_print_str(const char *label, void *table, u8 index)
+{
+ printf("\t%s: %s\n", label, smbios_get_string(table, index));
+}
+
+static void smbios_print_type1(struct smbios_type1 *table)
+{
+ printf("System Information\n");
+ smbios_print_str("Manufacturer", table, table->manufacturer);
+ smbios_print_str("Product Name", table, table->product_name);
+ smbios_print_str("Version", table, table->version);
+ smbios_print_str("Serial Number", table, table->serial_number);
+ if (table->length >= 0x19) {
+ printf("\tUUID %pUl\n", table->uuid);
+ smbios_print_str("Wake Up Type", table, table->serial_number);
+ }
+ if (table->length >= 0x1b) {
+ smbios_print_str("Serial Number", table, table->serial_number);
+ smbios_print_str("SKU Number", table, table->sku_number);
+ }
+}
+
+static void smbios_print_type2(struct smbios_type2 *table)
+{
+ u16 *handle;
+
+ printf("Base Board Information\n");
+ smbios_print_str("Manufacturer", table, table->manufacturer);
+ smbios_print_str("Product Name", table, table->product_name);
+ smbios_print_str("Version", table, table->version);
+ smbios_print_str("Serial Number", table, table->serial_number);
+ smbios_print_str("Asset Tag", table, table->asset_tag_number);
+ printf("\tFeature Flags: 0x%2x\n", table->feature_flags);
+ smbios_print_str("Chassis Location", table, table->chassis_location);
+ printf("\tChassis Handle: 0x%2x\n", table->chassis_handle);
+ smbios_print_str("Board Type", table, table->board_type);
+ printf("\tContained Object Handles: ");
+ handle = (void *)table->eos;
+ for (int i = 0; i < table->number_contained_objects; ++i)
+ printf("0x%04x ", handle[i]);
+ printf("\n");
+}
+
+static void smbios_print_type127(struct smbios_type127 *table)
+{
+ printf("End Of Table\n");
+}
+
+static int do_smbios(struct cmd_tbl *cmdtp, int flag, int argc,
+ char *const argv[])
+{
+ ulong addr;
+ void *entry;
+ u32 size;
+ char version[12];
+ struct smbios_header *table;
+ static const char smbios_sig[] = "_SM_";
+ static const char smbios3_sig[] = "_SM3_";
+ size_t count = 0;
+ u32 max_struct_size;
+
+ addr = gd_smbios_start();
+ if (!addr) {
+ log_warning("SMBIOS not available\n");
+ return CMD_RET_FAILURE;
+ }
+ entry = map_sysmem(addr, 0);
+ if (!memcmp(entry, smbios3_sig, sizeof(smbios3_sig) - 1)) {
+ struct smbios3_entry *entry3 = entry;
+
+ table = (void *)(uintptr_t)entry3->struct_table_address;
+ snprintf(version, sizeof(version), "%d.%d.%d",
+ entry3->major_ver, entry3->minor_ver, entry3->doc_rev);
+ table = (void *)(uintptr_t)entry3->struct_table_address;
+ size = entry3->length;
+ max_struct_size = entry3->max_struct_size;
+ } else if (!memcmp(entry, smbios_sig, sizeof(smbios_sig) - 1)) {
+ struct smbios_entry *entry2 = entry;
+
+ snprintf(version, sizeof(version), "%d.%d",
+ entry2->major_ver, entry2->minor_ver);
+ table = (void *)(uintptr_t)entry2->struct_table_address;
+ size = entry2->length;
+ max_struct_size = entry2->max_struct_size;
+ } else {
+ log_err("Unknown SMBIOS anchor format\n");
+ return CMD_RET_FAILURE;
+ }
+ if (table_compute_checksum(entry, size)) {
+ log_err("Invalid anchor checksum\n");
+ return CMD_RET_FAILURE;
+ }
+ printf("SMBIOS %s present.\n", version);
+
+ for (struct smbios_header *pos = table; pos; pos = next_table(pos))
+ ++count;
+ printf("%zd structures occupying %d bytes\n", count, max_struct_size);
+ printf("Table at 0x%llx\n", (unsigned long long)map_to_sysmem(table));
+
+ for (struct smbios_header *pos = table; pos; pos = next_table(pos)) {
+ printf("\nHandle 0x%04x, DMI type %d, %d bytes at 0x%llx\n",
+ pos->handle, pos->type, pos->length,
+ (unsigned long long)map_to_sysmem(pos));
+ switch (pos->type) {
+ case 1:
+ smbios_print_type1((struct smbios_type1 *)pos);
+ break;
+ case 2:
+ smbios_print_type2((struct smbios_type2 *)pos);
+ break;
+ case 127:
+ smbios_print_type127((struct smbios_type127 *)pos);
+ break;
+ default:
+ smbios_print_generic(pos);
+ break;
+ }
+ }
+
+ return CMD_RET_SUCCESS;
+}
+
+U_BOOT_LONGHELP(smbios, "- display SMBIOS information");
+
+U_BOOT_CMD(smbios, 1, 0, do_smbios, "display SMBIOS information",
+ smbios_help_text);
--
2.43.0
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