dmi_scan.c

来自「linux-2.4.29操作系统的源码」· C语言 代码 · 共 1,048 行 · 第 1/2 页

#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/acpi.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;
};

#ifdef DMI_DEBUG
#define dmi_printk(x) printk x
#else
#define dmi_printk(x)
#endif

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;

	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;
}

/*
 *  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;
}

/*
 * 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 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.
 */

typedef void (pm_kbd_func) (void);

static __init int broken_ps2_resume(struct dmi_blacklist *d)
{
#ifdef CONFIG_VT
	if (pm_kbd_request_override == NULL)
	{
		pm_kbd_request_override = pckbd_pm_resume;
		printk(KERN_INFO "%s machine detected. Mousepad Resume Bug workaround enabled.\n", d->ident);
	}
#endif
	return 0;
}

/*
 * Work around broken HP Pavilion Notebooks which assign USB to
 * IRQ 9 even though it is actually wired to IRQ 11
 */
static __init int fix_broken_hp_bios_irq9(struct dmi_blacklist *d)
{
#ifdef CONFIG_PCI
	extern int broken_hp_bios_irq9;
	if (broken_hp_bios_irq9 == 0)
	{
		broken_hp_bios_irq9 = 1;
		printk(KERN_INFO "%s detected - fixing broken IRQ routing\n", d->ident);
	}
#endif
	return 0;
}

/*
 * Work around broken Acer TravelMate 360 Notebooks which assign Cardbus to
 * IRQ 11 even though it is actually wired to IRQ 10
 */
static __init int fix_acer_tm360_irqrouting(struct dmi_blacklist *d)
{
#ifdef CONFIG_PCI
	extern int acer_tm360_irqrouting;
	if (acer_tm360_irqrouting == 0) {
		acer_tm360_irqrouting = 1;
		printk(KERN_INFO "%s detected - fixing broken IRQ routing\n", d->ident);
	}
#endif
	return 0;
}

/*
 *	Exploding PnPBIOS. Don't yet know if its the BIOS or us for
 *	some entries
 */

static __init int exploding_pnp_bios(struct dmi_blacklist *d)
{
	printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident);
	dmi_broken |= BROKEN_PNP_BIOS;
	return 0;
}

/*
 *	Simple "print if true" callback
 */
 
static __init int print_if_true(struct dmi_blacklist *d)
{
	printk("%s\n", d->ident);
	return 0;
}


#ifdef	CONFIG_ACPI_BOOT
extern int acpi_force;

static __init __attribute__((unused)) int dmi_disable_acpi(struct dmi_blacklist *d) 
{ 
	if (!acpi_force) { 
		printk(KERN_NOTICE "%s detected: acpi off\n",d->ident); 
		disable_acpi();
	} else { 
		printk(KERN_NOTICE 
		       "Warning: DMI blacklist says broken, but acpi forced\n"); 
	}
	return 0;
} 


/*
 * Limit ACPI to CPU enumeration for HT
 */
static __init __attribute__((unused)) int force_acpi_ht(struct dmi_blacklist *d) 
{ 
	if (!acpi_force) { 
		printk(KERN_NOTICE "%s detected: force use of acpi=ht\n", d->ident); 
		disable_acpi();
		acpi_ht = 1; 
	} else { 
		printk(KERN_NOTICE 
		       "Warning: acpi=force overrules DMI blacklist: acpi=ht\n"); 
	}
	return 0;
} 
#endif	/* CONFIG_ACPI_BOOT */

#ifdef	CONFIG_ACPI_PCI
static __init int disable_acpi_pci(struct dmi_blacklist *d) 
{ 
	printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n", d->ident);
	acpi_noirq_set();
	return 0;
} 
#endif	/* CONFIG_ACPI_PCI */

/*
 *	Process the DMI blacklists
 */