biosdecode.c

读取bios DMI信息

/*
 * BIOS Decode
 *
 *   Copyright (C) 2000-2002 Alan Cox <[e-mail]>
 *   Copyright (C) 2002-2007 Jean Delvare <[e-mail]>
 *
 *   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
 *   (at your option) 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 *   For the avoidance of doubt the "preferred form" of this code is one which
 *   is in an open unpatent encumbered format. Where cryptographic key signing
 *   forms part of the process of creating an executable the information
 *   including keys needed to generate an equivalently functional executable
 *   are deemed to be part of the source code.
 *
 * References:
 *  - DMTF "System Management BIOS Reference Specification"
 *    Version 2.3.4
 *    http://www.dmtf.org/standards/smbios
 *	- Intel "Preboot Execution Environment (PXE) Specification"
 *    Version 2.1
 *    http://www.intel.com/labs/manage/wfm/wfmspecs.htm
 *  - ACPI "Advanced Configuration and Power Interface Specification"
 *    Revision 2.0
 *    http://www.acpi.info/spec20.htm
 *  - Phoenix "BIOS32 Service Directory"
 *    Revision 0.4
 *    http://www.phoenix.com/en/support/white+papers-specs/
 *  - Microsoft "Plug and Play BIOS Specification"
 *    Version 1.0A
 *    http://www.microsoft.com/hwdev/tech/PnP/
 *  - Microsoft "PCI IRQ Routing Table Specification"
 *    Version 1.0
 *    http://www.microsoft.com/hwdev/archive/BUSBIOS/pciirq.asp
 *  - Compaq "Technical Reference Guide for Compaq Deskpro 4000 and 6000"
 *    First Edition
 *    http://h18000.www1.hp.com/support/techpubs/technical_reference_guides/113a1097.html
 *  - IBM "Using the BIOS Build ID to identify Thinkpad systems"
 *    Revision 2005-09-19
 *    http://www-307.ibm.com/pc/support/site.wss/MIGR-45120.html
 *  - Fujitsu application panel technical details
 *    As of July 23rd, 2004
 *    http://apanel.sourceforge.net/tech.php
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include "getopt.h"

#include "version.h"
#include "config.h"
#include "types.h"
#include "util.h"

/* Options are global */
struct opt
{
	const char *devmem;
	unsigned int flags;
};
static struct opt opt;

#define FLAG_VERSION            (1 << 0)
#define FLAG_HELP               (1 << 1)

struct bios_entry {
	const char *anchor;
	size_t anchor_len; /* computed */
	off_t low_address;
	off_t high_address;
	size_t (*length)(const u8 *);
	int (*decode)(const u8*, size_t);
};


/*
 * SMBIOS
 */

static size_t smbios_length(const u8 *p)
{
	return p[0x05] == 0x1E ? 0x1F : p[0x05];
}

static int smbios_decode(const u8 *p, size_t len)
{
	if (len < 0x1F || !checksum(p, p[0x05])
	 || memcmp("_DMI_", p + 0x10, 5) != 0
	 || !checksum(p + 0x10, 0x0F))
		return 0;

	printf("SMBIOS %u.%u present.\n",
		p[0x06], p[0x07]);
	printf("\tStructure Table Length: %u bytes\n",
		WORD(p+0x16));
	printf("\tStructure Table Address: 0x%08X\n",
		DWORD(p + 0x18));
	printf("\tNumber Of Structures: %u\n",
		WORD(p + 0x1C));
	printf("\tMaximum Structure Size: %u bytes\n",
		WORD(p + 0x08));

	return 1;
}

static size_t dmi_length(const u8 *p)
{
	(void) p;

	return 0x0F;
}

static int dmi_decode(const u8 *p, size_t len)
{
	if (len < 0x0F || !checksum(p, len))
		return 0;

	printf("Legacy DMI %u.%u present.\n",
		p[0x0E]>>4, p[0x0E] & 0x0F);
	printf("\tStructure Table Length: %u bytes\n",
		WORD(p + 0x06));
	printf("\tStructure Table Address: 0x%08X\n",
		DWORD(p + 0x08));
	printf("\tNumber Of Structures: %u\n",
		WORD(p + 0x0C));

	return 1;
}

/*
 * SYSID
 */

static size_t sysid_length(const u8 *p)
{
	return WORD(p + 0x08);
}

static int sysid_decode(const u8 *p, size_t len)
{
	if (len < 0x11 || !checksum(p, WORD(p + 0x08)))
		return 0;

	printf("SYSID present.\n");
	printf("\tRevision: %u\n",
		p[0x10]);
	printf("\tStructure Table Address: 0x%08X\n",
		DWORD(p + 0x0A));
	printf("\tNumber Of Structures: %u\n",
		WORD(p + 0x0E));

	return 1;
}

/*
 * PnP
 */

static size_t pnp_length(const u8 *p)
{
	return p[0x05];
}

static const char *pnp_event_notification(u8 code)
{
	static const char *notification[] = {
		"Not Supported", /* 0x0 */
		"Polling",
		"Asynchronous",
		"Unknown" /* 0x3 */
	};

	return notification[code];
}

static int pnp_decode(const u8 *p, size_t len)
{
	if (len < 0x21 || !checksum(p, p[0x05]))
		return 0;

	printf("PNP BIOS %u.%u present.\n",
		p[0x04] >> 4, p[0x04] & 0x0F);
	printf("\tEvent Notification: %s\n",
		pnp_event_notification(WORD(p + 0x06) & 0x03));
	if ((WORD(p + 0x06) & 0x03) == 0x01)
		printf("\tEvent Notification Flag Address: 0x%08X\n",
			DWORD(p + 0x09));
	printf("\tReal Mode 16-bit Code Address: %04X:%04X\n",
		WORD(p + 0x0F), WORD(p + 0x0D));
	printf("\tReal Mode 16-bit Data Address: %04X:0000\n",
		WORD(p + 0x1B));
	printf("\t16-bit Protected Mode Code Address: 0x%08X\n",
		DWORD(p + 0x13) + WORD(p + 0x11));
	printf("\t16-bit Protected Mode Data Address: 0x%08X\n",
		DWORD(p + 0x1D));
	if (DWORD(p + 0x17) != 0)
		printf("\tOEM Device Identifier: %c%c%c%02X%02X\n",
			0x40 + ((p[0x17] >> 2) & 0x1F),
			0x40 + ((p[0x17] & 0x03) << 3) + ((p[0x18] >> 5) & 0x07),
			0x40 + (p[0x18] & 0x1F), p[0x19], p[0x20]);

	return 1;
}

/*
 * ACPI
 */

static size_t acpi_length(const u8 *p)
{
	return p[15] == 2 ? 36 : 20;
}

static const char *acpi_revision(u8 code)
{
	switch (code)
	{
		case 0:
			return " 1.0";
		case 2:
			return " 2.0";
		default:
			return "";
	}
}

static int acpi_decode(const u8 *p, size_t len)
{
	if (len < 20 || !checksum(p, 20))
		return 0;

	printf("ACPI%s present.\n",
		acpi_revision(p[15]));
	printf("\tOEM Identifier: %c%c%c%c%c%c\n",
		p[9], p[10], p[11], p[12], p[13], p[14]);
	printf("\tRSD Table 32-bit Address: 0x%08X\n",
		DWORD(p + 16));

	if (len < 36)
		return 1;

	if (DWORD(p + 20) > len || !checksum(p, DWORD(p + 20)))
		return 0;

	if (DWORD(p + 20) < 32) return 1;

	printf("\tXSD Table 64-bit Address: 0x%08X%08X\n",
		QWORD(p + 24).h, QWORD(p + 24).l);

	return 1;
}

/*
 * Sony
 */

static size_t sony_length(const u8 *p)
{
	return p[0x05];
}

static int sony_decode(const u8 *p, size_t len)
{
	if (!checksum(p, len))
		return 0;

	printf("Sony system detected.\n");

	return 1;
}

/*
 * BIOS32
 */

static size_t bios32_length(const u8 *p)
{
	return p[0x09] << 4;
}

static int bios32_decode(const u8 *p, size_t len)
{
	if (len < 0x0A || !checksum(p, p[0x09] << 4))
		return 0;

	printf("BIOS32 Service Directory present.\n");
	printf("\tRevision: %u\n",
		p[0x08]);
	printf("\tCalling Interface Address: 0x%08X\n",
		DWORD(p + 0x04));

	return 1;
}

/*
 * PIR
 */

static void pir_irqs(u16 code)
{
	if (code == 0)
		printf(" None");
	else
	{
		u8 i;

		for (i = 0; i < 16; i++)
			if (code & (1 << i))
				printf(" %u", i);
	}
}

static void pir_slot_number(u8 code)
{
	if (code == 0)
		printf(" on-board");
	else
		printf(" slot number %u", code);
}

static size_t pir_length(const u8 *p)
{
	return WORD(p + 6);