Linux_SDK_V0.9.5Linux_SDK_V0.9.5

1 files changed, 55 insertions, 0 deletions

diff --git a/lib/efi_loader/efi_smbios.c b/lib/efi_loader/efi_smbios.c
new file mode 100644
index 00000000..a8148849
--- /dev/null
+++ b/lib/efi_loader/efi_smbios.c
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  EFI application tables support
+ *
+ *  Copyright (c) 2016 Alexander Graf
+ */
+
+#include <common.h>
+#include <efi_loader.h>
+#include <mapmem.h>
+#include <smbios.h>
+
+static const efi_guid_t smbios_guid = SMBIOS_TABLE_GUID;
+
+/*
+ * Install the SMBIOS table as a configuration table.
+ *
+ * @return	status code
+ */
+efi_status_t efi_smbios_register(void)
+{
+	/* Map within the low 32 bits, to allow for 32bit SMBIOS tables */
+	u64 dmi_addr = U32_MAX;
+	efi_status_t ret;
+	void *dmi;
+
+	/* Reserve 4kiB page for SMBIOS */
+	ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
+				 EFI_RUNTIME_SERVICES_DATA, 1, &dmi_addr);
+
+	if (ret != EFI_SUCCESS) {
+		/* Could not find space in lowmem, use highmem instead */
+		ret = efi_allocate_pages(EFI_ALLOCATE_ANY_PAGES,
+					 EFI_RUNTIME_SERVICES_DATA, 1,
+					 &dmi_addr);
+
+		if (ret != EFI_SUCCESS)
+			return ret;
+	}
+
+	/*
+	 * Generate SMBIOS tables - we know that efi_allocate_pages() returns
+	 * a 4k-aligned address, so it is safe to assume that
+	 * write_smbios_table() will write the table at that address.
+	 *
+	 * Note that on sandbox, efi_allocate_pages() unfortunately returns a
+	 * pointer even though it uses a uint64_t type. Convert it.
+	 */
+	assert(!(dmi_addr & 0xf));
+	dmi = (void *)(uintptr_t)dmi_addr;
+	write_smbios_table(map_to_sysmem(dmi));
+
+	/* And expose them to our EFI payload */
+	return efi_install_configuration_table(&smbios_guid, dmi);
+}