[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.

src/Makefile

@@ -58,7 +58,7 @@ SRCDIRS		+= drivers/block
 SRCDIRS		+= drivers/nvs
 SRCDIRS		+= drivers/bitbash
 SRCDIRS		+= drivers/infiniband
-SRCDIRS		+= interface/pxe interface/efi
+SRCDIRS		+= interface/pxe interface/efi interface/smbios
 SRCDIRS		+= tests
 SRCDIRS		+= crypto crypto/axtls crypto/matrixssl
 SRCDIRS		+= hci hci/commands hci/tui

src/arch/i386/include/bits/errfile.h

@@ -9,10 +9,9 @@
 #define ERRFILE_memtop_umalloc	( ERRFILE_ARCH | ERRFILE_CORE | 0x00000000 )
 #define ERRFILE_memmap		( ERRFILE_ARCH | ERRFILE_CORE | 0x00010000 )
 #define ERRFILE_pnpbios		( ERRFILE_ARCH | ERRFILE_CORE | 0x00020000 )
-#define ERRFILE_smbios		( ERRFILE_ARCH | ERRFILE_CORE | 0x00030000 )
+#define ERRFILE_bios_smbios	( ERRFILE_ARCH | ERRFILE_CORE | 0x00030000 )
 #define ERRFILE_biosint		( ERRFILE_ARCH | ERRFILE_CORE | 0x00040000 )
 #define ERRFILE_int13		( ERRFILE_ARCH | ERRFILE_CORE | 0x00050000 )
-#define ERRFILE_smbios_settings	( ERRFILE_ARCH | ERRFILE_CORE | 0x00060000 )
 
 #define ERRFILE_bootsector     ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x00000000 )
 #define ERRFILE_bzimage	       ( ERRFILE_ARCH | ERRFILE_IMAGE | 0x00010000 )

src/arch/i386/include/bits/smbios.h

@@ -0,0 +1,12 @@
+#ifndef _BITS_SMBIOS_H
+#define _BITS_SMBIOS_H
+
+/** @file
+ *
+ * i386-specific SMBIOS API implementations
+ *
+ */
+
+#include <gpxe/bios_smbios.h>
+
+#endif /* _BITS_SMBIOS_H */

src/arch/i386/include/gpxe/bios_smbios.h

@@ -0,0 +1,16 @@
+#ifndef _GPXE_BIOS_SMBIOS_H
+#define _GPXE_BIOS_SMBIOS_H
+
+/** @file
+ *
+ * Standard PC-BIOS SMBIOS interface
+ *
+ */
+
+#ifdef SMBIOS_PCBIOS
+#define SMBIOS_PREFIX_pcbios
+#else
+#define SMBIOS_PREFIX_pcbios __pcbios_
+#endif
+
+#endif /* _GPXE_BIOS_SMBIOS_H */

src/arch/i386/include/smbios.h

@@ -1,60 +0,0 @@
-#ifndef _SMBIOS_H
-#define _SMBIOS_H
-
-/** @file
- *
- * System Management BIOS
- */
-
-#include <stdint.h>
-
-/** An SMBIOS structure header */
-struct smbios_header {
-	/** Type */
-	uint8_t type;
-	/** Length */
-	uint8_t len;
-	/** Handle */
-	uint16_t handle;
-} __attribute__ (( packed ));
-
-/** SMBIOS structure descriptor */
-struct smbios_structure {
-	/** Copy of SMBIOS structure header */
-	struct smbios_header header;
-	/** Offset of structure within SMBIOS */
-	size_t offset;
-	/** Length of strings section */
-	size_t strings_len;
-};
-
-/** SMBIOS system information structure */
-struct smbios_system_information {
-	/** SMBIOS structure header */
-	struct smbios_header header;
-	/** Manufacturer string */
-	uint8_t manufacturer;
-	/** Product string */
-	uint8_t product;
-	/** Version string */
-	uint8_t version;
-	/** Serial number string */
-	uint8_t serial;
-	/** UUID */
-	uint8_t uuid[16];
-	/** Wake-up type */
-	uint8_t wakeup;
-} __attribute__ (( packed ));
-
-/** SMBIOS system information structure type */
-#define SMBIOS_TYPE_SYSTEM_INFORMATION 1
-
-extern int find_smbios_structure ( unsigned int type,
-				   struct smbios_structure *structure );
-extern int read_smbios_structure ( struct smbios_structure *structure,
-				   void *data, size_t len );
-extern int read_smbios_string ( struct smbios_structure *structure,
-				unsigned int index,
-				void *data, size_t len );
-
-#endif /* _SMBIOS_H */

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 );

src/config/defaults/efi.h

@@ -14,6 +14,7 @@
 #define TIMER_EFI
 #define NAP_EFIX86
 #define UMALLOC_EFI
+#define SMBIOS_EFI
 
 #define	IMAGE_EFI		/* EFI image support */
 

src/config/defaults/pcbios.h

@@ -14,6 +14,7 @@
 #define CONSOLE_PCBIOS
 #define NAP_PCBIOS
 #define UMALLOC_MEMTOP
+#define SMBIOS_PCBIOS
 
 #define	IMAGE_ELF		/* ELF image support */
 #define	IMAGE_MULTIBOOT		/* MultiBoot image support */

src/include/gpxe/efi/Guid/SmBios.h

@@ -0,0 +1,34 @@
+/** @file
+  GUIDs used to locate the SMBIOS tables in the UEFI 2.0 system table.
+
+  This GUID in the system table is the only legal way to search for and
+  locate the SMBIOS tables. Do not search the 0xF0000 segment to find SMBIOS
+  tables.
+
+  Copyright (c) 2006, Intel Corporation
+  All rights reserved. This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+  @par Revision Reference:
+  GUIDs defined in UEFI 2.0 spec.
+
+**/
+
+#ifndef __SMBIOS_GUID_H__
+#define __SMBIOS_GUID_H__
+
+#define EFI_SMBIOS_TABLE_GUID \
+  { \
+    0xeb9d2d31, 0x2d88, 0x11d3, {0x9a, 0x16, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d } \
+  }
+
+#define SMBIOS_TABLE_GUID EFI_SMBIOS_TABLE_GUID
+
+extern EFI_GUID       gEfiSmbiosTableGuid;
+
+#endif

src/include/gpxe/efi/efi_smbios.h

@@ -0,0 +1,16 @@
+#ifndef _GPXE_EFI_SMBIOS_H
+#define _GPXE_EFI_SMBIOS_H
+
+/** @file
+ *
+ * gPXE SMBIOS API for EFI
+ *
+ */
+
+#ifdef SMBIOS_EFI
+#define SMBIOS_PREFIX_efi
+#else
+#define SMBIOS_PREFIX_efi __efi_
+#endif
+
+#endif /* _GPXE_EFI_SMBIOS_H */

src/include/gpxe/errfile.h

@@ -164,6 +164,9 @@
 #define ERRFILE_iscsiboot	      ( ERRFILE_OTHER | 0x000f0000 )
 #define ERRFILE_efi_pci		      ( ERRFILE_OTHER | 0x00100000 )
 #define ERRFILE_efi_snp		      ( ERRFILE_OTHER | 0x00110000 )
+#define ERRFILE_smbios		      ( ERRFILE_OTHER | 0x00120000 )
+#define ERRFILE_smbios_settings	      ( ERRFILE_OTHER | 0x00130000 )
+#define ERRFILE_efi_smbios	      ( ERRFILE_OTHER | 0x00140000 )
 
 /** @} */
 

src/include/gpxe/smbios.h

@@ -0,0 +1,140 @@
+#ifndef _GPXE_SMBIOS_H
+#define _GPXE_SMBIOS_H
+
+/** @file
+ *
+ * System Management BIOS
+ *
+ */
+
+#include <stdint.h>
+#include <gpxe/api.h>
+#include <config/general.h>
+#include <gpxe/uaccess.h>
+
+/**
+ * Provide an SMBIOS API implementation
+ *
+ * @v _prefix		Subsystem prefix
+ * @v _api_func		API function
+ * @v _func		Implementing function
+ */
+#define PROVIDE_SMBIOS( _subsys, _api_func, _func ) \
+	PROVIDE_SINGLE_API ( SMBIOS_PREFIX_ ## _subsys, _api_func, _func )
+
+/* Include all architecture-independent SMBIOS API headers */
+#include <gpxe/efi/efi_smbios.h>
+
+/* Include all architecture-dependent SMBIOS API headers */
+#include <bits/smbios.h>
+
+/** Signature for SMBIOS entry point */
+#define SMBIOS_SIGNATURE \
+        ( ( '_' << 0 ) + ( 'S' << 8 ) + ( 'M' << 16 ) + ( '_' << 24 ) )
+
+/**
+ * SMBIOS entry point
+ *
+ * This is the single table which describes the list of SMBIOS
+ * structures.  It is located by scanning through the BIOS segment.
+ */
+struct smbios_entry {
+	/** Signature
+	 *
+	 * Must be equal to SMBIOS_SIGNATURE
+	 */
+	uint32_t signature;
+	/** Checksum */
+	uint8_t checksum;
+	/** Length */
+	uint8_t len;
+	/** Major version */
+	uint8_t major;
+	/** Minor version */
+	uint8_t minor;
+	/** Maximum structure size */
+	uint16_t max;
+	/** Entry point revision */
+	uint8_t revision;
+	/** Formatted area */
+	uint8_t formatted[5];
+	/** DMI Signature */
+	uint8_t dmi_signature[5];
+	/** DMI checksum */
+	uint8_t dmi_checksum;
+	/** Structure table length */
+	uint16_t smbios_len;
+	/** Structure table address */
+	uint32_t smbios_address;
+	/** Number of SMBIOS structures */
+	uint16_t smbios_count;
+	/** BCD revision */
+	uint8_t bcd_revision;
+} __attribute__ (( packed ));
+
+/** An SMBIOS structure header */
+struct smbios_header {
+	/** Type */
+	uint8_t type;
+	/** Length */
+	uint8_t len;
+	/** Handle */
+	uint16_t handle;
+} __attribute__ (( packed ));
+
+/** SMBIOS structure descriptor */
+struct smbios_structure {
+	/** Copy of SMBIOS structure header */
+	struct smbios_header header;
+	/** Offset of structure within SMBIOS */
+	size_t offset;
+	/** Length of strings section */
+	size_t strings_len;
+};
+
+/** SMBIOS system information structure */
+struct smbios_system_information {
+	/** SMBIOS structure header */
+	struct smbios_header header;
+	/** Manufacturer string */
+	uint8_t manufacturer;
+	/** Product string */
+	uint8_t product;
+	/** Version string */
+	uint8_t version;
+	/** Serial number string */
+	uint8_t serial;
+	/** UUID */
+	uint8_t uuid[16];
+	/** Wake-up type */
+	uint8_t wakeup;
+} __attribute__ (( packed ));
+
+/** SMBIOS system information structure type */
+#define SMBIOS_TYPE_SYSTEM_INFORMATION 1
+
+/**
+ * SMBIOS entry point descriptor
+ *
+ * This contains the information from the SMBIOS entry point that we
+ * care about.
+ */
+struct smbios {
+	/** Start of SMBIOS structures */
+	userptr_t address;
+	/** Length of SMBIOS structures */
+	size_t len;
+	/** Number of SMBIOS structures */
+	unsigned int count;
+};
+
+extern int find_smbios ( struct smbios *smbios );
+extern int find_smbios_structure ( unsigned int type,
+				   struct smbios_structure *structure );
+extern int read_smbios_structure ( struct smbios_structure *structure,
+				   void *data, size_t len );
+extern int read_smbios_string ( struct smbios_structure *structure,
+				unsigned int index,
+				void *data, size_t len );
+
+#endif /* _GPXE_SMBIOS_H */

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 );

src/interface/smbios/smbios.c

@@ -21,9 +21,7 @@
 #include <errno.h>
 #include <assert.h>
 #include <gpxe/uaccess.h>
-#include <realmode.h>
-#include <pnpbios.h>
-#include <smbios.h>
+#include <gpxe/smbios.h>
 
 /** @file
  *
@@ -31,123 +29,11 @@
  *
  */
 
-/** Signature for SMBIOS entry point */
-#define SMBIOS_SIGNATURE \
-        ( ( '_' << 0 ) + ( 'S' << 8 ) + ( 'M' << 16 ) + ( '_' << 24 ) )
-
-/**
- * SMBIOS entry point
- *
- * This is the single table which describes the list of SMBIOS
- * structures.  It is located by scanning through the BIOS segment.
- */
-struct smbios_entry {
-	/** Signature
-	 *
-	 * Must be equal to SMBIOS_SIGNATURE
-	 */
-	uint32_t signature;
-	/** Checksum */
-	uint8_t checksum;
-	/** Length */
-	uint8_t len;
-	/** Major version */
-	uint8_t major;
-	/** Minor version */
-	uint8_t minor;
-	/** Maximum structure size */
-	uint16_t max;
-	/** Entry point revision */
-	uint8_t revision;
-	/** Formatted area */
-	uint8_t formatted[5];
-	/** DMI Signature */
-	uint8_t dmi_signature[5];
-	/** DMI checksum */
-	uint8_t dmi_checksum;
-	/** Structure table length */
-	uint16_t smbios_len;
-	/** Structure table address */
-	physaddr_t smbios_address;
-	/** Number of SMBIOS structures */
-	uint16_t smbios_count;
-	/** BCD revision */
-	uint8_t bcd_revision;
-} __attribute__ (( packed ));
-
-/**
- * SMBIOS entry point descriptor
- *
- * This contains the information from the SMBIOS entry point that we
- * care about.
- */
-struct smbios {
-	/** Start of SMBIOS structures */
-	userptr_t address;
-	/** Length of SMBIOS structures */ 
-	size_t len;
-	/** Number of SMBIOS structures */
-	unsigned int count;
-};
-
 /** SMBIOS entry point descriptor */
 static struct smbios smbios = {
 	.address = UNULL,
 };
 
-/**
- * Find SMBIOS
- *
- * @ret rc		Return status code
- */
-static int find_smbios ( void ) {
-	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;
-
-	/* Return cached result if avaiable */
-	if ( smbios.address != UNULL )
-		return 0;
-
-	/* 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;
-}
-
 /**
  * Find SMBIOS strings terminator
  *
@@ -182,8 +68,10 @@ int find_smbios_structure ( unsigned int type,
 	int rc;
 
 	/* Find SMBIOS */
-	if ( ( rc = find_smbios() ) != 0 )
+	if ( ( smbios.address == UNULL ) &&
+	     ( ( rc = find_smbios ( &smbios ) ) != 0 ) )
 		return rc;
+	assert ( smbios.address != UNULL );
 
 	/* Scan through list of structures */
 	while ( ( ( offset + sizeof ( structure->header ) ) < smbios.len )

src/interface/smbios/smbios_settings.c

@@ -22,7 +22,7 @@
 #include <gpxe/settings.h>
 #include <gpxe/init.h>
 #include <gpxe/uuid.h>
-#include <smbios.h>
+#include <gpxe/smbios.h>
 
 /** SMBIOS settings tag magic number */
 #define SMBIOS_TAG_MAGIC 0x5B /* "SmBios" */