dmi_scan.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/apm_bios.h>
#include <linux/slab.h>
#include <asm/io.h>
#include <linux/pm.h>
#include <asm/keyboard.h>
#include <asm/system.h>
#include <linux/bootmem.h>

#include "pci-i386.h"

unsigned long dmi_broken;
int is_sony_vaio_laptop;

struct dmi_header
{
	u8	type;
	u8	length;
	u16	handle;
};

#define dmi_printk(x)
//#define dmi_printk(x) printk x

static char * __init dmi_string(struct dmi_header *dm, u8 s)
{
	u8 *bp=(u8 *)dm;
	bp+=dm->length;
	if(!s)
		return "";
	s--;
	while(s>0 && *bp)
	{
		bp+=strlen(bp);
		bp++;
		s--;
	}
	return bp;
}

/*
 *	We have to be cautious here. We have seen BIOSes with DMI pointers
 *	pointing to completely the wrong place for example
 */
 
static int __init dmi_table(u32 base, int len, int num, void (*decode)(struct dmi_header *))
{
	u8 *buf;
	struct dmi_header *dm;
	u8 *data;
	int i=0;
		
	buf = bt_ioremap(base, len);
	if(buf==NULL)
		return -1;

	data = buf;

	/*
 	 *	Stop when we see all the items the table claimed to have
 	 *	OR we run off the end of the table (also happens)
 	 */
 
	while(i<num && data-buf+sizeof(struct dmi_header)<=len)
	{
		dm=(struct dmi_header *)data;
		/*
		 *  We want to know the total length (formated area and strings)
		 *  before decoding to make sure we won't run off the table in
		 *  dmi_decode or dmi_string
		 */
		data+=dm->length;
		while(data-buf<len-1 && (data[0] || data[1]))
			data++;
		if(data-buf<len-1)
			decode(dm);
		data+=2;
		i++;
	}
	bt_iounmap(buf, len);
	return 0;
}


inline static int __init dmi_checksum(u8 *buf)
{
	u8 sum=0;
	int a;
	
	for(a=0; a<15; a++)
		sum+=buf[a];
	return (sum==0);
}

static int __init dmi_iterate(void (*decode)(struct dmi_header *))
{
	u8 buf[15];
	u32 fp=0xF0000;

#ifdef CONFIG_SIMNOW
	/*
 	 *	Skip on x86/64 with simnow. Will eventually go away
 	 *	If you see this ifdef in 2.6pre mail me !
 	 */
	return -1;
#endif
 	
	while( fp < 0xFFFFF)
	{
		isa_memcpy_fromio(buf, fp, 15);
		if(memcmp(buf, "_DMI_", 5)==0 && dmi_checksum(buf))
		{
			u16 num=buf[13]<<8|buf[12];
			u16 len=buf[7]<<8|buf[6];
			u32 base=buf[11]<<24|buf[10]<<16|buf[9]<<8|buf[8];

			/*
			 * DMI version 0.0 means that the real version is taken from
			 * the SMBIOS version, which we don't know at this point.
			 */
			if(buf[14]!=0)
				dmi_printk((KERN_INFO "DMI %d.%d present.\n",
					buf[14]>>4, buf[14]&0x0F));
			else
				dmi_printk((KERN_INFO "DMI present.\n"));
			dmi_printk((KERN_INFO "%d structures occupying %d bytes.\n",
				num, len));
			dmi_printk((KERN_INFO "DMI table at 0x%08X.\n",
				base));
			if(dmi_table(base,len, num, decode)==0)
				return 0;
		}
		fp+=16;
	}
	return -1;
}


enum
{
	DMI_BIOS_VENDOR,
	DMI_BIOS_VERSION,
	DMI_BIOS_DATE,
	DMI_SYS_VENDOR,
	DMI_PRODUCT_NAME,
	DMI_PRODUCT_VERSION,
	DMI_BOARD_VENDOR,
	DMI_BOARD_NAME,
	DMI_BOARD_VERSION,
	DMI_STRING_MAX
};

static char *dmi_ident[DMI_STRING_MAX];

/*
 *	Save a DMI string
 */
 
static void __init dmi_save_ident(struct dmi_header *dm, int slot, int string)
{
	char *d = (char*)dm;
	char *p = dmi_string(dm, d[string]);
	if(p==NULL || *p == 0)
		return;
	if (dmi_ident[slot])
		return;
	dmi_ident[slot] = alloc_bootmem(strlen(p)+1);
	if(dmi_ident[slot])
		strcpy(dmi_ident[slot], p);
	else
		printk(KERN_ERR "dmi_save_ident: out of memory.\n");
}

/*
 *	DMI callbacks for problem boards
 */

struct dmi_strmatch
{
	u8 slot;
	char *substr;
};

#define NONE	255

struct dmi_blacklist
{
	int (*callback)(struct dmi_blacklist *);
	char *ident;
	struct dmi_strmatch matches[4];
};

#define NO_MATCH	{ NONE, NULL}
#define MATCH(a,b)	{ a, b }

/*
 *	We have problems with IDE DMA on some platforms. In paticular the
 *	KT7 series. On these it seems the newer BIOS has fixed them. The
 *	rule needs to be improved to match specific BIOS revisions with
 *	corruption problems
 
static __init int disable_ide_dma(struct dmi_blacklist *d)
{
#ifdef CONFIG_BLK_DEV_IDE
	extern int noautodma;
	if(noautodma == 0)
	{
		noautodma = 1;
		printk(KERN_INFO "%s series board detected. Disabling IDE DMA.\n", d->ident);
	}
#endif	
	return 0;
}
 */ 

/* 
 * Reboot options and system auto-detection code provided by
 * Dell Computer Corporation so their systems "just work". :-)
 */

/* 
 * Some machines require the "reboot=b"  commandline option, this quirk makes that automatic.
 */
static __init int set_bios_reboot(struct dmi_blacklist *d)
{
	extern int reboot_thru_bios;
	if (reboot_thru_bios == 0)
	{
		reboot_thru_bios = 1;
		printk(KERN_INFO "%s series board detected. Selecting BIOS-method for reboots.\n", d->ident);
	}
	return 0;
}

/*
 * Some machines require the "reboot=s"  commandline option, this quirk makes that automatic.
 */
static __init int set_smp_reboot(struct dmi_blacklist *d)
{
#ifdef CONFIG_SMP
	extern int reboot_smp;
	if (reboot_smp == 0)
	{
		reboot_smp = 1;
		printk(KERN_INFO "%s series board detected. Selecting SMP-method for reboots.\n", d->ident);
	}
#endif
	return 0;
}

/*
 * Some machines require the "reboot=b,s"  commandline option, this quirk makes that automatic.
 */
static __init int set_smp_bios_reboot(struct dmi_blacklist *d)
{
	set_smp_reboot(d);
	set_bios_reboot(d);
	return 0;
}

/*
 * Some bioses have a broken protected mode poweroff and need to use realmode
 */

static __init int set_realmode_power_off(struct dmi_blacklist *d)
{
       if (apm_info.realmode_power_off == 0)
       {
               apm_info.realmode_power_off = 1;
               printk(KERN_INFO "%s bios detected. Using realmode poweroff only.\n", d->ident);
       }
       return 0;
}


/* 
 * Some laptops require interrupts to be enabled during APM calls 
 */

static __init int set_apm_ints(struct dmi_blacklist *d)
{
	if (apm_info.allow_ints == 0)
	{
		apm_info.allow_ints = 1;
		printk(KERN_INFO "%s machine detected. Enabling interrupts during APM calls.\n", d->ident);
	}
	return 0;
}

/* 
 * Some APM bioses corrupt memory or just plain do not work
 */

static __init int apm_is_horked(struct dmi_blacklist *d)
{
	if (apm_info.disabled == 0)
	{
		apm_info.disabled = 1;
		printk(KERN_INFO "%s machine detected. Disabling APM.\n", d->ident);
	}
	return 0;
}

static __init int apm_is_horked_d850md(struct dmi_blacklist *d)
{
	if (apm_info.disabled == 0)
	{
		apm_info.disabled = 1;
		printk(KERN_ERR "%s machine detected. Disabling APM.\n", d->ident);
		printk(KERN_ERR "This bug is fixed in bios P15 which is available for \n");
		printk(KERN_ERR "download from support.intel.com \n");
	}
	return 0;
}

/* 
 * Some APM bioses hang on APM idle calls
 */

static __init int apm_likes_to_melt(struct dmi_blacklist *d)
{
	if (apm_info.forbid_idle == 0)
	{
		apm_info.forbid_idle = 1;
		printk(KERN_INFO "%s machine detected. Disabling APM idle calls.\n", d->ident);
	}
	return 0;
}

/*
 * Some machines, usually laptops, can't handle an enabled local APIC.
 * The symptoms include hangs or reboots when suspending or resuming,
 * attaching or detaching the power cord, or entering BIOS setup screens
 * through magic key sequences.
 */
static int __init local_apic_kills_bios(struct dmi_blacklist *d)
{
#ifdef CONFIG_X86_LOCAL_APIC
	extern int dont_enable_local_apic;
	if (!dont_enable_local_apic) {
		dont_enable_local_apic = 1;
		printk(KERN_WARNING "%s with broken BIOS detected. "
		       "Refusing to enable the local APIC.\n",
		       d->ident);
	}
#endif
	return 0;
}

/*
 * The Microstar 6163-2 (a.k.a Pro) mainboard will hang shortly after
 * resumes, and also at what appears to be asynchronous APM events,
 * if the local APIC is enabled.
 */
static int __init apm_kills_local_apic(struct dmi_blacklist *d)
{
#ifdef CONFIG_X86_LOCAL_APIC
	extern int dont_enable_local_apic;
	if (apm_info.bios.version && !dont_enable_local_apic) {
		dont_enable_local_apic = 1;
		printk(KERN_WARNING "%s with broken BIOS detected. "
		       "Refusing to enable the local APIC.\n",
		       d->ident);
	}
#endif
	return 0;
}

/*
 * The Intel AL440LX mainboard will hang randomly if the local APIC
 * timer is running and the APM BIOS hasn't been disabled.
 */
static int __init apm_kills_local_apic_timer(struct dmi_blacklist *d)
{
#ifdef CONFIG_X86_LOCAL_APIC
	extern int dont_use_local_apic_timer;
	if (apm_info.bios.version && !dont_use_local_apic_timer) {
		dont_use_local_apic_timer = 1;
		printk(KERN_WARNING "%s with broken BIOS detected. "
		       "The local APIC timer will not be used.\n",
		       d->ident);
	}
#endif
	return 0;
}

/*
 *  Check for clue free BIOS implementations who use
 *  the following QA technique
 *
 *      [ Write BIOS Code ]<------
 *               |                ^
 *      < Does it Compile >----N--
 *               |Y               ^
 *	< Does it Boot Win98 >-N--
 *               |Y
 *           [Ship It]
 *
 *	Phoenix A04  08/24/2000 is known bad (Dell Inspiron 5000e)
 *	Phoenix A07  09/29/2000 is known good (Dell Inspiron 5000)
 */

static __init int broken_apm_power(struct dmi_blacklist *d)
{
	apm_info.get_power_status_broken = 1;
	printk(KERN_WARNING "BIOS strings suggest APM bugs, disabling power status reporting.\n");
	return 0;
}		

/*
 * Check for a Sony Vaio system
 *
 * On a Sony system we want to enable the use of the sonypi
 * driver for Sony-specific goodies like the camera and jogdial.
 * We also want to avoid using certain functions of the PnP BIOS.
 */

static __init int sony_vaio_laptop(struct dmi_blacklist *d)
{
	if (is_sony_vaio_laptop == 0)
	{
		is_sony_vaio_laptop = 1;
		printk(KERN_INFO "%s laptop detected.\n", d->ident);
	}
	return 0;
}

/*
 * This bios swaps the APM minute reporting bytes over (Many sony laptops
 * have this problem).
 */
 
static __init int swab_apm_power_in_minutes(struct dmi_blacklist *d)
{
	apm_info.get_power_status_swabinminutes = 1;
	printk(KERN_WARNING "BIOS strings suggest APM reports battery life in minutes and wrong byte order.\n");
	return 0;
}

/*
 * The Intel 440GX hall of shame. 
 *
 * On many (all we have checked) of these boxes the $PIRQ table is wrong.
 * The MP1.4 table is right however and so SMP kernels tend to work. 
 */
 
extern int skip_ioapic_setup;
extern int broken_440gx_bios;
extern unsigned int pci_probe;
static __init int broken_pirq(struct dmi_blacklist *d)
{
	printk(KERN_ERR " *** Possibly defective BIOS detected (irqtable)\n");
	printk(KERN_ERR " *** Many BIOSes matching this signature have incorrect IRQ routing tables.\n");
	printk(KERN_ERR " *** If you see IRQ problems, in particular SCSI resets and hangs at boot\n");
	printk(KERN_ERR " *** contact your hardware vendor and ask about updates.\n");
	printk(KERN_INFO " *** Building an SMP kernel may evade the bug some of the time.\n");
#ifdef CONFIG_X86_IO_APIC
	skip_ioapic_setup = 0;
#endif
	broken_440gx_bios = 1;
	pci_probe |= PCI_BIOS_IRQ_SCAN;
	
	return 0;
}

/*
 * ASUS K7V-RM has broken ACPI table defining sleep modes
 */

static __init int broken_acpi_Sx(struct dmi_blacklist *d)
{
	printk(KERN_WARNING "Detected ASUS mainboard with broken ACPI sleep table\n");
	dmi_broken |= BROKEN_ACPI_Sx;
	return 0;
}

/*
 * Toshiba keyboard likes to repeat keys when they are not repeated.
 */

static __init int broken_toshiba_keyboard(struct dmi_blacklist *d)
{
	printk(KERN_WARNING "Toshiba with broken keyboard detected. If your keyboard sometimes generates 3 keypresses instead of one, contact [e-mail]\n");
	return 0;
}

/*
 * Toshiba fails to preserve interrupts over S1
 */

static __init int init_ints_after_s1(struct dmi_blacklist *d)
{
	printk(KERN_WARNING "Toshiba with broken S1 detected.\n");
	dmi_broken |= BROKEN_INIT_AFTER_S1;
	return 0;
}

/*
 * Some Bioses enable the PS/2 mouse (touchpad) at resume, even if it
 * was disabled before the suspend. Linux gets terribly confused by that.