[PATCH v1 53/54] efi: loader: pass along SMBIOS table

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

This allows e.g. dmidecode in Linux to query the information that barebox
has collected.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 common/Kconfig      | 13 +++++++++++
 efi/loader/Makefile |  1 +
 efi/loader/smbios.c | 55 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 69 insertions(+)
 create mode 100644 efi/loader/smbios.c

diff --git a/common/Kconfig b/common/Kconfig
index b61a5bc40a1f..d4d9d930a996 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -755,6 +755,19 @@ config MMCBLKDEV_ROOTARG
 	  [1] fa2d0aa96941 ("mmc: core: Allow setting slot index via device tree
 	      alias")
 
+config GENERATE_SMBIOS_TABLE
+	bool "Generate an SMBIOS (System Management BIOS) table"
+	depends on EFI_LOADER && OF
+	select SMBIOS
+	default y
+	help
+	  The System Management BIOS (SMBIOS) specification addresses how
+	  motherboard and system vendors present management information about
+	  their products in a standard format by extending the BIOS interface
+	  on Intel architecture systems.
+
+	  Check http://www.dmtf.org/standards/smbios for details.
+
 config BAREBOX_UPDATE
 	bool "In-system barebox update infrastructure"
 
diff --git a/efi/loader/Makefile b/efi/loader/Makefile
index c06d1f7c8c35..7992a4f5caa0 100644
--- a/efi/loader/Makefile
+++ b/efi/loader/Makefile
@@ -15,6 +15,7 @@ obj-y += loadopts.o
 obj-$(CONFIG_BOOT) += bootesp.o
 obj-$(CONFIG_EFI_LOADER_BOOTMGR) += efibootmgr.o
 obj-$(CONFIG_BOOTM) += bootm.o
+obj-$(CONFIG_GENERATE_SMBIOS_TABLE) += smbios.o
 obj-y += efi_var_common.o
 obj-y += efi_variable.o
 obj-y += efi_var_mem.o
diff --git a/efi/loader/smbios.c b/efi/loader/smbios.c
new file mode 100644
index 000000000000..81ba77c24017
--- /dev/null
+++ b/efi/loader/smbios.c
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0+
+// SPDX-FileCopyrightText: 2016 Alexander Graf
+// SPDX-Comment: Origin-URL: https://github.com/u-boot/u-boot/blob/1c5aab803c0b0f07be1d3b0029f4031463497acf/lib/efi_loader/efi_smbios.c
+
+#define pr_fmt(fmt) "efi-loader: smbios: " fmt
+
+#include <efi/loader.h>
+#include <efi/guid.h>
+#include <efi/error.h>
+#include <efi/memory.h>
+#include <efi/loader/table.h>
+#include <linux/printk.h>
+#include <malloc.h>
+#include <smbios.h>
+#include <init.h>
+#include <linux/sizes.h>
+
+#define TABLE_SIZE	SZ_4K
+
+/*
+ * Install the SMBIOS table as a configuration table.
+ *
+ * Return:	status code
+ */
+static efi_status_t efi_smbios_register(void *data)
+{
+	efi_status_t ret;
+	u64 memory;
+	void *buf;
+
+	/* Align the table to a 4KB boundary to keep EFI happy */
+	ret = efi_allocate_pages(EFI_ALLOCATE_ANY_PAGES,
+				 EFI_RUNTIME_SERVICES_DATA,
+				 efi_size_in_pages(TABLE_SIZE),
+				 &memory, "smbios");
+	if (ret != EFI_SUCCESS)
+		return ret;
+
+	buf = efi_phys_to_virt(memory);
+
+	if (!write_smbios_table(buf)) {
+		pr_err("Failed to write SMBIOS table\n");
+		return -EINVAL;
+	}
+
+	/* Install SMBIOS information as configuration table */
+	return efi_install_configuration_table(&efi_smbios3_guid, buf);
+}
+
+static int efi_smbios_init(void)
+{
+	efi_register_deferred_init(efi_smbios_register, NULL);
+	return 0;
+}
+postenvironment_initcall(efi_smbios_init);
-- 
2.47.3