[efi] Use EFI-native mechanism for accessing SMBIOS table

EFI provides a copy of the SMBIOS table accessible via the EFI system
table, which we should use instead of manually scanning through the
F000:0000 segment.

1 files changed, 62 insertions, 0 deletions

diff --git a/src/interface/efi/efi_smbios.c b/src/interface/efi/efi_smbios.c
new file mode 100644
index 00000000..5888f2f9
--- /dev/null
+++ b/src/interface/efi/efi_smbios.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * 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; either version 2 of the
+ * License, or any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <errno.h>
+#include <gpxe/smbios.h>
+#include <gpxe/efi/efi.h>
+#include <gpxe/efi/Guid/SmBios.h>
+
+/** @file
+ *
+ * gPXE SMBIOS API for EFI
+ *
+ */
+
+/** SMBIOS configuration table */
+static struct smbios_entry *smbios_entry;
+EFI_USE_TABLE ( EFI_SMBIOS_TABLE, &smbios_entry, 0 );
+
+/**
+ * Find SMBIOS
+ *
+ * @v smbios		SMBIOS entry point descriptor structure to fill in
+ * @ret rc		Return status code
+ */
+static int efi_find_smbios ( struct smbios *smbios ) {
+
+	if ( ! smbios_entry ) {
+		DBG ( "No SMBIOS table provided\n" );
+		return -ENODEV;
+	}
+
+	if ( smbios_entry->signature != SMBIOS_SIGNATURE ) {
+		DBG ( "Invalid SMBIOS signature\n" );
+		return -ENODEV;
+	}
+
+	smbios->address = phys_to_user ( smbios_entry->smbios_address );
+	smbios->len = smbios_entry->smbios_len;
+	smbios->count = smbios_entry->smbios_count;
+	DBG ( "Found SMBIOS v%d.%d entry point at %p (%x+%zx)\n",
+	      smbios_entry->major, smbios_entry->minor, smbios_entry,
+	      smbios_entry->smbios_address, smbios->len );
+
+	return 0;
+}
+
+PROVIDE_SMBIOS ( efi, find_smbios, efi_find_smbios );