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authorH. Peter Anvin <hpa@zytor.com>2009-02-17 20:17:17 -0800
committerH. Peter Anvin <hpa@zytor.com>2009-02-17 20:17:17 -0800
commitd0c6656a62113b913948361779d6298fe76f6e61 (patch)
treeefa2541a1abae4760717c6db421ea818114ab6f7 /gpxe/src/arch/i386/interface/pcbios/bios_smbios.c
parent85b92a462dab7ce36c48614ea18314f8fc83ca9c (diff)
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Update gPXE to version 0.9.6+ 277b84c6e7d49f3cf01c855007f591de8c7cb75f
Update gPXE to version 0.9.6+, from commit 277b84c6e7d49f3cf01c855007f591de8c7cb75f in the main gPXE repository. The only differences is src/config/general.h which has a few protocols added, and src/arch/i386/prefix/boot1a.S which was called boot1a.s in the upstream repository.
Diffstat (limited to 'gpxe/src/arch/i386/interface/pcbios/bios_smbios.c')
-rw-r--r--gpxe/src/arch/i386/interface/pcbios/bios_smbios.c84
1 files changed, 84 insertions, 0 deletions
diff --git a/gpxe/src/arch/i386/interface/pcbios/bios_smbios.c b/gpxe/src/arch/i386/interface/pcbios/bios_smbios.c
new file mode 100644
index 00000000..efaaef0d
--- /dev/null
+++ b/gpxe/src/arch/i386/interface/pcbios/bios_smbios.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2007 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 <stdint.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+#include <gpxe/uaccess.h>
+#include <gpxe/smbios.h>
+#include <realmode.h>
+#include <pnpbios.h>
+
+/** @file
+ *
+ * System Management BIOS
+ *
+ */
+
+/**
+ * Find SMBIOS
+ *
+ * @v smbios SMBIOS entry point descriptor structure to fill in
+ * @ret rc Return status code
+ */
+static int bios_find_smbios ( struct smbios *smbios ) {
+ union {
+ struct smbios_entry entry;
+ uint8_t bytes[256]; /* 256 is maximum length possible */
+ } u;
+ static unsigned int offset = 0;
+ size_t len;
+ unsigned int i;
+ uint8_t sum;
+
+ /* Try to find SMBIOS */
+ for ( ; offset < 0x10000 ; offset += 0x10 ) {
+
+ /* Read start of header and verify signature */
+ copy_from_real ( &u.entry, BIOS_SEG, offset,
+ sizeof ( u.entry ));
+ if ( u.entry.signature != SMBIOS_SIGNATURE )
+ continue;
+
+ /* Read whole header and verify checksum */
+ len = u.entry.len;
+ copy_from_real ( &u.bytes, BIOS_SEG, offset, len );
+ for ( i = 0 , sum = 0 ; i < len ; i++ ) {
+ sum += u.bytes[i];
+ }
+ if ( sum != 0 ) {
+ DBG ( "SMBIOS at %04x:%04x has bad checksum %02x\n",
+ BIOS_SEG, offset, sum );
+ continue;
+ }
+
+ /* Fill result structure */
+ DBG ( "Found SMBIOS v%d.%d entry point at %04x:%04x\n",
+ u.entry.major, u.entry.minor, BIOS_SEG, offset );
+ smbios->address = phys_to_user ( u.entry.smbios_address );
+ smbios->len = u.entry.smbios_len;
+ smbios->count = u.entry.smbios_count;
+ return 0;
+ }
+
+ DBG ( "No SMBIOS found\n" );
+ return -ENODEV;
+}
+
+PROVIDE_SMBIOS ( pcbios, find_smbios, bios_find_smbios );