netboot/pci.c - grub4dos-solaris - Rivoreo Source Code Repositories

 /*
 ** Support for NE2000 PCI clones added David Monro June 1997
 ** Generalised to other NICs by Ken Yap July 1997
 **
 ** Most of this is taken from:
 **
 ** /usr/src/linux/drivers/pci/pci.c
 ** /usr/src/linux/include/linux/pci.h
 ** /usr/src/linux/arch/i386/bios32.c
 ** /usr/src/linux/include/linux/bios32.h
 ** /usr/src/linux/drivers/net/ne.c
 **
 ** Limitations: only finds devices on bus 0 (I figure that anybody with
 ** a multi-pcibus machine will have something better than an ne2000)
 */

 #include "etherboot.h"
 #include "pci.h"

 /*#define	DEBUG	1*/
 static unsigned int pci_ioaddr = 0;

 #ifdef CONFIG_PCI_DIRECT
 #define  PCIBIOS_SUCCESSFUL                0x00

 /*
  * Functions for accessing PCI configuration space with type 1 accesses
  */

 #define CONFIG_CMD(bus, device_fn, where)   (0x80000000 | (bus << 16) | (device_fn << 8) | (where & ~3))

 int pcibios_read_config_byte(unsigned char bus, unsigned char device_fn,
 			       unsigned char where, unsigned char *value)
 {
     outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
     *value = inb(0xCFC + (where&3));
     return PCIBIOS_SUCCESSFUL;
 }

 int pcibios_read_config_word (unsigned char bus,
     unsigned char device_fn, unsigned char where, unsigned short *value)
 {
     outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
     *value = inw(0xCFC + (where&2));
     return PCIBIOS_SUCCESSFUL;
 }

 static int pcibios_read_config_dword (unsigned char bus, unsigned char device_fn,
 				 unsigned char where, unsigned int *value)
 {
     outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
     *value = inl(0xCFC);
     return PCIBIOS_SUCCESSFUL;
 }

 int pcibios_write_config_byte (unsigned char bus, unsigned char device_fn,
 				 unsigned char where, unsigned char value)
 {
     outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
     outb(value, 0xCFC + (where&3));
     return PCIBIOS_SUCCESSFUL;
 }

 int pcibios_write_config_word (unsigned char bus, unsigned char device_fn,
 				 unsigned char where, unsigned short value)
 {
     outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
     outw(value, 0xCFC + (where&2));
     return PCIBIOS_SUCCESSFUL;
 }

 int pcibios_write_config_dword (unsigned char bus, unsigned char device_fn, unsigned char where, unsigned int value)
 {
     outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
     outl(value, 0xCFC);
     return PCIBIOS_SUCCESSFUL;
 }

 #undef CONFIG_CMD

 #else  /* CONFIG_PCI_DIRECT  not defined */

 static unsigned long bios32_entry = 0;
 static struct {
 	unsigned long address;
 	unsigned short segment;
 } bios32_indirect = { 0, KERN_CODE_SEG };

 static long pcibios_entry = 0;
 static struct {
 	unsigned long address;
 	unsigned short segment;
 } pci_indirect = { 0, KERN_CODE_SEG };

 static unsigned long bios32_service(unsigned long service)
 {
 	unsigned char return_code;	/* %al */
 	unsigned long address;		/* %ebx */
 	unsigned long length;		/* %ecx */
 	unsigned long entry;		/* %edx */
 	unsigned long flags;

 	save_flags(flags);
 	__asm__("lcall (%%edi)"
 		: "=a" (return_code),
 		  "=b" (address),
 		  "=c" (length),
 		  "=d" (entry)
 		: "0" (service),
 		  "1" (0),
 		  "D" (&bios32_indirect));
 	restore_flags(flags);

 	switch (return_code) {
 		case 0:
 			return address + entry;
 		case 0x80:	/* Not present */
 			printf("bios32_service(%d) : not present\n", service);
 			return 0;
 		default: /* Shouldn't happen */
 			printf("bios32_service(%d) : returned 0x%x, mail drew@colorado.edu\n",
 				service, return_code);
 			return 0;
 	}
 }

 int pcibios_read_config_byte(unsigned char bus,
         unsigned char device_fn, unsigned char where, unsigned char *value)
 {
         unsigned long ret;
         unsigned long bx = (bus << 8) | device_fn;
         unsigned long flags;

         save_flags(flags);
         __asm__("lcall (%%esi)\n\t"
                 "jc 1f\n\t"
                 "xor %%ah, %%ah\n"
                 "1:"
                 : "=c" (*value),
                   "=a" (ret)
                 : "1" (PCIBIOS_READ_CONFIG_BYTE),
                   "b" (bx),
                   "D" ((long) where),
                   "S" (&pci_indirect));
         restore_flags(flags);
         return (int) (ret & 0xff00) >> 8;
 }

 int pcibios_read_config_word(unsigned char bus,
         unsigned char device_fn, unsigned char where, unsigned short *value)
 {
         unsigned long ret;
         unsigned long bx = (bus << 8) | device_fn;
         unsigned long flags;

         save_flags(flags);
         __asm__("lcall (%%esi)\n\t"
                 "jc 1f\n\t"
                 "xor %%ah, %%ah\n"
                 "1:"
                 : "=c" (*value),
                   "=a" (ret)
                 : "1" (PCIBIOS_READ_CONFIG_WORD),
                   "b" (bx),
                   "D" ((long) where),
                   "S" (&pci_indirect));
         restore_flags(flags);
         return (int) (ret & 0xff00) >> 8;
 }

 static int pcibios_read_config_dword(unsigned char bus,
         unsigned char device_fn, unsigned char where, unsigned int *value)
 {
         unsigned long ret;
         unsigned long bx = (bus << 8) | device_fn;
         unsigned long flags;

         save_flags(flags);
         __asm__("lcall (%%esi)\n\t"
                 "jc 1f\n\t"
                 "xor %%ah, %%ah\n"
                 "1:"
                 : "=c" (*value),
                   "=a" (ret)
                 : "1" (PCIBIOS_READ_CONFIG_DWORD),
                   "b" (bx),
                   "D" ((long) where),
                   "S" (&pci_indirect));
         restore_flags(flags);
         return (int) (ret & 0xff00) >> 8;
 }

 int pcibios_write_config_byte (unsigned char bus,
 	unsigned char device_fn, unsigned char where, unsigned char value)
 {
 	unsigned long ret;
 	unsigned long bx = (bus << 8) | device_fn;
 	unsigned long flags;

 	save_flags(flags); cli();
 	__asm__("lcall (%%esi)\n\t"
 		"jc 1f\n\t"
 		"xor %%ah, %%ah\n"
 		"1:"
 		: "=a" (ret)
 		: "0" (PCIBIOS_WRITE_CONFIG_BYTE),
 		  "c" (value),
 		  "b" (bx),
 		  "D" ((long) where),
 		  "S" (&pci_indirect));
 	restore_flags(flags);
 	return (int) (ret & 0xff00) >> 8;
 }

 int pcibios_write_config_word (unsigned char bus,
 	unsigned char device_fn, unsigned char where, unsigned short value)
 {
 	unsigned long ret;
 	unsigned long bx = (bus << 8) | device_fn;
 	unsigned long flags;

 	save_flags(flags); cli();
 	__asm__("lcall (%%esi)\n\t"
 		"jc 1f\n\t"
 		"xor %%ah, %%ah\n"
 		"1:"
 		: "=a" (ret)
 		: "0" (PCIBIOS_WRITE_CONFIG_WORD),
 		  "c" (value),
 		  "b" (bx),
 		  "D" ((long) where),
 		  "S" (&pci_indirect));
 	restore_flags(flags);
 	return (int) (ret & 0xff00) >> 8;
 }

 int pcibios_write_config_dword (unsigned char bus,
 	unsigned char device_fn, unsigned char where, unsigned int value)
 {
 	unsigned long ret;
 	unsigned long bx = (bus << 8) | device_fn;
 	unsigned long flags;

 	save_flags(flags); cli();
 	__asm__("lcall (%%esi)\n\t"
 		"jc 1f\n\t"
 		"xor %%ah, %%ah\n"
 		"1:"
 		: "=a" (ret)
 		: "0" (PCIBIOS_WRITE_CONFIG_DWORD),
 		  "c" (value),
 		  "b" (bx),
 		  "D" ((long) where),
 		  "S" (&pci_indirect));
 	restore_flags(flags);
 	return (int) (ret & 0xff00) >> 8;
 }

 static void check_pcibios(void)
 {
 	unsigned long signature;
 	unsigned char present_status;
 	unsigned char major_revision;
 	unsigned char minor_revision;
 	unsigned long flags;
 	int pack;

 	if ((pcibios_entry = bios32_service(PCI_SERVICE))) {
 		pci_indirect.address = pcibios_entry;

 		save_flags(flags);
 		__asm__("lcall (%%edi)\n\t"
 			"jc 1f\n\t"
 			"xor %%ah, %%ah\n"
 			"1:\tshl $8, %%eax\n\t"
 			"movw %%bx, %%ax"
 			: "=d" (signature),
 			  "=a" (pack)
 			: "1" (PCIBIOS_PCI_BIOS_PRESENT),
 			  "D" (&pci_indirect)
 			: "bx", "cx");
 		restore_flags(flags);

 		present_status = (pack >> 16) & 0xff;
 		major_revision = (pack >> 8) & 0xff;
 		minor_revision = pack & 0xff;
 		if (present_status || (signature != PCI_SIGNATURE)) {
 			printf("ERROR: BIOS32 says PCI BIOS, but no PCI "
 				"BIOS????\n");
 			pcibios_entry = 0;
 		}
 #if DEBUG
 		if (pcibios_entry) {
 			printf ("pcibios_init : PCI BIOS revision %b.%b"
 				" entry at 0x%X\n", major_revision,
 				minor_revision, pcibios_entry);
 		}
 #endif
 	}
 }

 static void pcibios_init(void)
 {
 	union bios32 *check;
 	unsigned char sum;
 	int i, length;

 	/*
 	 * Follow the standard procedure for locating the BIOS32 Service
 	 * directory by scanning the permissible address range from
 	 * 0xe0000 through 0xfffff for a valid BIOS32 structure.
 	 *
 	 */

 	for (check = (union bios32 *) 0xe0000; check <= (union bios32 *) 0xffff0; ++check) {
 		if (check->fields.signature != BIOS32_SIGNATURE)
 			continue;
 		length = check->fields.length * 16;
 		if (!length)
 			continue;
 		sum = 0;
 		for (i = 0; i < length ; ++i)
 			sum += check->chars[i];
 		if (sum != 0)
 			continue;
 		if (check->fields.revision != 0) {
 			printf("pcibios_init : unsupported revision %d at 0x%X, mail drew@colorado.edu\n",
 				check->fields.revision, check);
 			continue;
 		}
 #if DEBUG
 		printf("pcibios_init : BIOS32 Service Directory "
 			"structure at 0x%X\n", check);
 #endif
 		if (!bios32_entry) {
 			if (check->fields.entry >= 0x100000) {
 				printf("pcibios_init: entry in high "
 					"memory, giving up\n");
 				return;
 			} else {
 				bios32_entry = check->fields.entry;
 #if DEBUG
 				printf("pcibios_init : BIOS32 Service Directory"
 					" entry at 0x%X\n", bios32_entry);
 #endif
 				bios32_indirect.address = bios32_entry;
 			}
 		}
 	}
 	if (bios32_entry)
 		check_pcibios();
 }
 #endif /* CONFIG_PCI_DIRECT not defined*/

 static void scan_bus(struct pci_device *pcidev)
 {
 	unsigned int devfn, l, bus, buses;
 	unsigned char hdr_type = 0;
 	unsigned short vendor, device;
 	unsigned int membase, ioaddr, romaddr;
 	unsigned char class, subclass;
 	int i, reg;

 	pci_ioaddr = 0;
 	buses=1;
 	for (bus = 0; bus < buses; ++bus) {
 		for (devfn = 0; devfn < 0xff; ++devfn) {
 			if (PCI_FUNC (devfn) == 0)
 				pcibios_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type);
 			else if (!(hdr_type & 0x80))	/* not a multi-function device */
 				continue;
 			pcibios_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l);
 			/* some broken boards return 0 if a slot is empty: */
 			if (l == 0xffffffff || l == 0x00000000) {
 				hdr_type = 0;
 				continue;
 			}
 			vendor = l & 0xffff;
 			device = (l >> 16) & 0xffff;

 			/* check for pci-pci bridge devices!! - more buses when found */
 			pcibios_read_config_byte(bus, devfn, PCI_CLASS_CODE, &class);
 			pcibios_read_config_byte(bus, devfn, PCI_SUBCLASS_CODE, &subclass);
 			if (class == 0x06 && subclass == 0x04)
 				buses++;

 	#if DEBUG
 			printf("bus %x, function %x, vendor %x, device %x\n",
 				bus, devfn, vendor, device);
 	#endif
 			for (i = 0; pcidev[i].vendor != 0; i++) {
 				if (vendor != pcidev[i].vendor
 				    || device != pcidev[i].dev_id)
 					continue;
 				for (reg = PCI_BASE_ADDRESS_0; reg <= PCI_BASE_ADDRESS_5; reg += 4) {
 					pcibios_read_config_dword(bus, devfn, reg, &ioaddr);

 					if ((ioaddr & PCI_BASE_ADDRESS_IO_MASK) == 0 || (ioaddr & PCI_BASE_ADDRESS_SPACE_IO) == 0)
 						continue;
 					/* Strip the I/O address out of the returned value */
 					ioaddr &= PCI_BASE_ADDRESS_IO_MASK;
 					/* Get the memory base address */
 					pcibios_read_config_dword(bus, devfn,
 						PCI_BASE_ADDRESS_1, &membase);
 					/* Get the ROM base address */
 					pcibios_read_config_dword(bus, devfn, PCI_ROM_ADDRESS, &romaddr);
 					romaddr >>= 10;
 					printf("Found %s at 0x%x, ROM address 0x%X\n",
 						pcidev[i].name, ioaddr, romaddr);
 					/* Take the first one or the one that matches in boot ROM address */
 					if (pci_ioaddr == 0 || romaddr == ((long) rom.rom_segment >> 4)) {
 						pcidev[i].membase = membase;
 						pcidev[i].ioaddr = ioaddr;
 						pcidev[i].devfn = devfn;

 						return;
 					}
 				}
 			}
 		}
 	}
 }

 void eth_pci_init(struct pci_device *pcidev)
 {
 #ifndef CONFIG_PCI_DIRECT
 	pcibios_init();
 	if (!pcibios_entry) {
 		printf("pci_init: no BIOS32 detected\n");
 		return;
 	}
 #endif
 	scan_bus(pcidev);
 	/* return values are in pcidev structures */
 }
	/*
	** Support for NE2000 PCI clones added David Monro June 1997
	** Generalised to other NICs by Ken Yap July 1997
	**
	** Most of this is taken from:
	**
	** /usr/src/linux/drivers/pci/pci.c
	** /usr/src/linux/include/linux/pci.h
	** /usr/src/linux/arch/i386/bios32.c
	** /usr/src/linux/include/linux/bios32.h
	** /usr/src/linux/drivers/net/ne.c
	**
	** Limitations: only finds devices on bus 0 (I figure that anybody with
	** a multi-pcibus machine will have something better than an ne2000)
	*/

	#include "etherboot.h"
	#include "pci.h"

	/#define DEBUG 1/
	static unsigned int pci_ioaddr = 0;

	#ifdef CONFIG_PCI_DIRECT
	#define PCIBIOS_SUCCESSFUL 0x00

	/*
	* Functions for accessing PCI configuration space with type 1 accesses
	*/

	#define CONFIG_CMD(bus, device_fn, where) (0x80000000 \| (bus << 16) \| (device_fn << 8) \| (where & ~3))

	int pcibios_read_config_byte(unsigned char bus, unsigned char device_fn,
	unsigned char where, unsigned char *value)
	{
	outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
	*value = inb(0xCFC + (where&3));
	return PCIBIOS_SUCCESSFUL;
	}

	int pcibios_read_config_word (unsigned char bus,
	unsigned char device_fn, unsigned char where, unsigned short *value)
	{
	outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
	*value = inw(0xCFC + (where&2));
	return PCIBIOS_SUCCESSFUL;
	}

	static int pcibios_read_config_dword (unsigned char bus, unsigned char device_fn,
	unsigned char where, unsigned int *value)
	{
	outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
	*value = inl(0xCFC);
	return PCIBIOS_SUCCESSFUL;
	}

	int pcibios_write_config_byte (unsigned char bus, unsigned char device_fn,
	unsigned char where, unsigned char value)
	{
	outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
	outb(value, 0xCFC + (where&3));
	return PCIBIOS_SUCCESSFUL;
	}

	int pcibios_write_config_word (unsigned char bus, unsigned char device_fn,
	unsigned char where, unsigned short value)
	{
	outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
	outw(value, 0xCFC + (where&2));
	return PCIBIOS_SUCCESSFUL;
	}

	int pcibios_write_config_dword (unsigned char bus, unsigned char device_fn, unsigned char where, unsigned int value)
	{
	outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
	outl(value, 0xCFC);
	return PCIBIOS_SUCCESSFUL;
	}

	#undef CONFIG_CMD

	#else /* CONFIG_PCI_DIRECT not defined */

	static unsigned long bios32_entry = 0;
	static struct {
	unsigned long address;
	unsigned short segment;
	} bios32_indirect = { 0, KERN_CODE_SEG };

	static long pcibios_entry = 0;
	static struct {
	unsigned long address;
	unsigned short segment;
	} pci_indirect = { 0, KERN_CODE_SEG };

	static unsigned long bios32_service(unsigned long service)
	{
	unsigned char return_code; /* %al */
	unsigned long address; /* %ebx */
	unsigned long length; /* %ecx */
	unsigned long entry; /* %edx */
	unsigned long flags;

	save_flags(flags);
	__asm__("lcall (%%edi)"
	: "=a" (return_code),
	"=b" (address),
	"=c" (length),
	"=d" (entry)
	: "0" (service),
	"1" (0),
	"D" (&bios32_indirect));
	restore_flags(flags);

	switch (return_code) {
	case 0:
	return address + entry;
	case 0x80: /* Not present */
	printf("bios32_service(%d) : not present\n", service);
	return 0;
	default: /* Shouldn't happen */
	printf("bios32_service(%d) : returned 0x%x, mail drew@colorado.edu\n",
	service, return_code);
	return 0;
	}
	}

	int pcibios_read_config_byte(unsigned char bus,
	unsigned char device_fn, unsigned char where, unsigned char *value)
	{
	unsigned long ret;
	unsigned long bx = (bus << 8) \| device_fn;
	unsigned long flags;

	save_flags(flags);
	__asm__("lcall (%%esi)\n\t"
	"jc 1f\n\t"
	"xor %%ah, %%ah\n"
	"1:"
	: "=c" (*value),
	"=a" (ret)
	: "1" (PCIBIOS_READ_CONFIG_BYTE),
	"b" (bx),
	"D" ((long) where),
	"S" (&pci_indirect));
	restore_flags(flags);
	return (int) (ret & 0xff00) >> 8;
	}

	int pcibios_read_config_word(unsigned char bus,
	unsigned char device_fn, unsigned char where, unsigned short *value)
	{
	unsigned long ret;
	unsigned long bx = (bus << 8) \| device_fn;
	unsigned long flags;

	save_flags(flags);
	__asm__("lcall (%%esi)\n\t"
	"jc 1f\n\t"
	"xor %%ah, %%ah\n"
	"1:"
	: "=c" (*value),
	"=a" (ret)
	: "1" (PCIBIOS_READ_CONFIG_WORD),
	"b" (bx),
	"D" ((long) where),
	"S" (&pci_indirect));
	restore_flags(flags);
	return (int) (ret & 0xff00) >> 8;
	}

	static int pcibios_read_config_dword(unsigned char bus,
	unsigned char device_fn, unsigned char where, unsigned int *value)
	{
	unsigned long ret;
	unsigned long bx = (bus << 8) \| device_fn;
	unsigned long flags;

	save_flags(flags);
	__asm__("lcall (%%esi)\n\t"
	"jc 1f\n\t"
	"xor %%ah, %%ah\n"
	"1:"
	: "=c" (*value),
	"=a" (ret)
	: "1" (PCIBIOS_READ_CONFIG_DWORD),
	"b" (bx),
	"D" ((long) where),
	"S" (&pci_indirect));
	restore_flags(flags);
	return (int) (ret & 0xff00) >> 8;
	}

	int pcibios_write_config_byte (unsigned char bus,
	unsigned char device_fn, unsigned char where, unsigned char value)
	{
	unsigned long ret;
	unsigned long bx = (bus << 8) \| device_fn;
	unsigned long flags;

	save_flags(flags); cli();
	__asm__("lcall (%%esi)\n\t"
	"jc 1f\n\t"
	"xor %%ah, %%ah\n"
	"1:"
	: "=a" (ret)
	: "0" (PCIBIOS_WRITE_CONFIG_BYTE),
	"c" (value),
	"b" (bx),
	"D" ((long) where),
	"S" (&pci_indirect));
	restore_flags(flags);
	return (int) (ret & 0xff00) >> 8;
	}

	int pcibios_write_config_word (unsigned char bus,
	unsigned char device_fn, unsigned char where, unsigned short value)
	{
	unsigned long ret;
	unsigned long bx = (bus << 8) \| device_fn;
	unsigned long flags;

	save_flags(flags); cli();
	__asm__("lcall (%%esi)\n\t"
	"jc 1f\n\t"
	"xor %%ah, %%ah\n"
	"1:"
	: "=a" (ret)
	: "0" (PCIBIOS_WRITE_CONFIG_WORD),
	"c" (value),
	"b" (bx),
	"D" ((long) where),
	"S" (&pci_indirect));
	restore_flags(flags);
	return (int) (ret & 0xff00) >> 8;
	}

	int pcibios_write_config_dword (unsigned char bus,
	unsigned char device_fn, unsigned char where, unsigned int value)
	{
	unsigned long ret;
	unsigned long bx = (bus << 8) \| device_fn;
	unsigned long flags;

	save_flags(flags); cli();
	__asm__("lcall (%%esi)\n\t"
	"jc 1f\n\t"
	"xor %%ah, %%ah\n"
	"1:"
	: "=a" (ret)
	: "0" (PCIBIOS_WRITE_CONFIG_DWORD),
	"c" (value),
	"b" (bx),
	"D" ((long) where),
	"S" (&pci_indirect));
	restore_flags(flags);
	return (int) (ret & 0xff00) >> 8;
	}

	static void check_pcibios(void)
	{
	unsigned long signature;
	unsigned char present_status;
	unsigned char major_revision;
	unsigned char minor_revision;
	unsigned long flags;
	int pack;

	if ((pcibios_entry = bios32_service(PCI_SERVICE))) {
	pci_indirect.address = pcibios_entry;

	save_flags(flags);
	__asm__("lcall (%%edi)\n\t"
	"jc 1f\n\t"
	"xor %%ah, %%ah\n"
	"1:\tshl $8, %%eax\n\t"
	"movw %%bx, %%ax"
	: "=d" (signature),
	"=a" (pack)
	: "1" (PCIBIOS_PCI_BIOS_PRESENT),
	"D" (&pci_indirect)
	: "bx", "cx");
	restore_flags(flags);

	present_status = (pack >> 16) & 0xff;
	major_revision = (pack >> 8) & 0xff;
	minor_revision = pack & 0xff;
	if (present_status \|\| (signature != PCI_SIGNATURE)) {
	printf("ERROR: BIOS32 says PCI BIOS, but no PCI "
	"BIOS????\n");
	pcibios_entry = 0;
	}
	#if DEBUG
	if (pcibios_entry) {
	printf ("pcibios_init : PCI BIOS revision %b.%b"
	" entry at 0x%X\n", major_revision,
	minor_revision, pcibios_entry);
	}
	#endif
	}
	}

	static void pcibios_init(void)
	{
	union bios32 *check;
	unsigned char sum;
	int i, length;

	/*
	* Follow the standard procedure for locating the BIOS32 Service
	* directory by scanning the permissible address range from
	* 0xe0000 through 0xfffff for a valid BIOS32 structure.
	*
	*/

	for (check = (union bios32 ) 0xe0000; check <= (union bios32 ) 0xffff0; ++check) {
	if (check->fields.signature != BIOS32_SIGNATURE)
	continue;
	length = check->fields.length * 16;
	if (!length)
	continue;
	sum = 0;
	for (i = 0; i < length ; ++i)
	sum += check->chars[i];
	if (sum != 0)
	continue;
	if (check->fields.revision != 0) {
	printf("pcibios_init : unsupported revision %d at 0x%X, mail drew@colorado.edu\n",
	check->fields.revision, check);
	continue;
	}
	#if DEBUG
	printf("pcibios_init : BIOS32 Service Directory "
	"structure at 0x%X\n", check);
	#endif
	if (!bios32_entry) {
	if (check->fields.entry >= 0x100000) {
	printf("pcibios_init: entry in high "
	"memory, giving up\n");
	return;
	} else {
	bios32_entry = check->fields.entry;
	#if DEBUG
	printf("pcibios_init : BIOS32 Service Directory"
	" entry at 0x%X\n", bios32_entry);
	#endif
	bios32_indirect.address = bios32_entry;
	}
	}
	}
	if (bios32_entry)
	check_pcibios();
	}
	#endif /* CONFIG_PCI_DIRECT not defined*/

	static void scan_bus(struct pci_device *pcidev)
	{
	unsigned int devfn, l, bus, buses;
	unsigned char hdr_type = 0;
	unsigned short vendor, device;
	unsigned int membase, ioaddr, romaddr;
	unsigned char class, subclass;
	int i, reg;

	pci_ioaddr = 0;
	buses=1;
	for (bus = 0; bus < buses; ++bus) {
	for (devfn = 0; devfn < 0xff; ++devfn) {
	if (PCI_FUNC (devfn) == 0)
	pcibios_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type);
	else if (!(hdr_type & 0x80)) /* not a multi-function device */
	continue;
	pcibios_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l);
	/* some broken boards return 0 if a slot is empty: */
	if (l == 0xffffffff \|\| l == 0x00000000) {
	hdr_type = 0;
	continue;
	}
	vendor = l & 0xffff;
	device = (l >> 16) & 0xffff;

	/* check for pci-pci bridge devices!! - more buses when found */
	pcibios_read_config_byte(bus, devfn, PCI_CLASS_CODE, &class);
	pcibios_read_config_byte(bus, devfn, PCI_SUBCLASS_CODE, &subclass);
	if (class == 0x06 && subclass == 0x04)
	buses++;

	#if DEBUG
	printf("bus %x, function %x, vendor %x, device %x\n",
	bus, devfn, vendor, device);
	#endif
	for (i = 0; pcidev[i].vendor != 0; i++) {
	if (vendor != pcidev[i].vendor
	\|\| device != pcidev[i].dev_id)
	continue;
	for (reg = PCI_BASE_ADDRESS_0; reg <= PCI_BASE_ADDRESS_5; reg += 4) {
	pcibios_read_config_dword(bus, devfn, reg, &ioaddr);

	if ((ioaddr & PCI_BASE_ADDRESS_IO_MASK) == 0 \|\| (ioaddr & PCI_BASE_ADDRESS_SPACE_IO) == 0)
	continue;
	/* Strip the I/O address out of the returned value */
	ioaddr &= PCI_BASE_ADDRESS_IO_MASK;
	/* Get the memory base address */
	pcibios_read_config_dword(bus, devfn,
	PCI_BASE_ADDRESS_1, &membase);
	/* Get the ROM base address */
	pcibios_read_config_dword(bus, devfn, PCI_ROM_ADDRESS, &romaddr);
	romaddr >>= 10;
	printf("Found %s at 0x%x, ROM address 0x%X\n",
	pcidev[i].name, ioaddr, romaddr);
	/* Take the first one or the one that matches in boot ROM address */
	if (pci_ioaddr == 0 \|\| romaddr == ((long) rom.rom_segment >> 4)) {
	pcidev[i].membase = membase;
	pcidev[i].ioaddr = ioaddr;
	pcidev[i].devfn = devfn;

	return;
	}
	}
	}
	}
	}
	}

	void eth_pci_init(struct pci_device *pcidev)
	{
	#ifndef CONFIG_PCI_DIRECT
	pcibios_init();
	if (!pcibios_entry) {
	printf("pci_init: no BIOS32 detected\n");
	return;
	}
	#endif
	scan_bus(pcidev);
	/* return values are in pcidev structures */
	}