netboot/pci_io.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
 */
 #define PCBIOS
 #include "grub.h"
 #include "pci.h"

 #ifdef	CONFIG_PCI_DIRECT
 #define  PCIBIOS_SUCCESSFUL                0x00

 #define DEBUG 0

 /*
  * 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 int bus, unsigned int device_fn,
 			       unsigned int where, uint8_t *value)
 {
     outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
     *value = inb(0xCFC + (where&3));
     return PCIBIOS_SUCCESSFUL;
 }

 int pcibios_read_config_word (unsigned int bus,
     unsigned int device_fn, unsigned int where, uint16_t *value)
 {
     outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
     *value = inw(0xCFC + (where&2));
     return PCIBIOS_SUCCESSFUL;
 }

 int pcibios_read_config_dword (unsigned int bus, unsigned int device_fn,
 				 unsigned int where, uint32_t *value)
 {
     outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
     *value = inl(0xCFC);
     return PCIBIOS_SUCCESSFUL;
 }

 int pcibios_write_config_byte (unsigned int bus, unsigned int device_fn,
 				 unsigned int where, uint8_t value)
 {
     outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
     outb(value, 0xCFC + (where&3));
     return PCIBIOS_SUCCESSFUL;
 }

 int pcibios_write_config_word (unsigned int bus, unsigned int device_fn,
 				 unsigned int where, uint16_t value)
 {
     outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
     outw(value, 0xCFC + (where&2));
     return PCIBIOS_SUCCESSFUL;
 }

 int pcibios_write_config_dword (unsigned int bus, unsigned int device_fn, unsigned int where, uint32_t value)
 {
     outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
     outl(value, 0xCFC);
     return PCIBIOS_SUCCESSFUL;
 }

 #undef CONFIG_CMD

 #else	 /* CONFIG_PCI_DIRECT  not defined */

 #if !defined(PCBIOS)
 #error "The pcibios can only be used when the PCBIOS support is compiled in"
 #endif


 #define KERN_CODE_SEG 0X8
 /* Stuff for asm */
 #define save_flags(x) \
 __asm__ __volatile__("pushfl ; popl %0":"=g" (x): /* no input */ :"memory")

 #define cli() __asm__ __volatile__ ("cli": : :"memory")

 #define restore_flags(x) \
 __asm__ __volatile__("pushl %0 ; popfl": /* no output */ :"g" (x):"memory")


 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__(
 #ifdef ABSOLUTE_WITHOUT_ASTERISK
 		"lcall (%%edi)"
 #else
 		"lcall *(%%edi)"
 #endif
 		: "=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 %#X, mail drew@colorado.edu\n",
 				service, return_code);
 			return 0;
 	}
 }

 int pcibios_read_config_byte(unsigned int bus,
         unsigned int device_fn, unsigned int where, uint8_t *value)
 {
         unsigned long ret;
         unsigned long bx = (bus << 8) | device_fn;
         unsigned long flags;

         save_flags(flags);
         __asm__(
 #ifdef ABSOLUTE_WITHOUT_ASTERISK
 		"lcall (%%esi)\n\t"
 #else
 		"lcall *(%%esi)\n\t"
 #endif
                 "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 int bus,
         unsigned int device_fn, unsigned int where, uint16_t *value)
 {
         unsigned long ret;
         unsigned long bx = (bus << 8) | device_fn;
         unsigned long flags;

         save_flags(flags);
         __asm__(
 #ifdef ABSOLUTE_WITHOUT_ASTERISK
 		"lcall (%%esi)\n\t"
 #else
 		"lcall *(%%esi)\n\t"
 #endif
                 "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;
 }

 int pcibios_read_config_dword(unsigned int bus,
         unsigned int device_fn, unsigned int where, uint32_t *value)
 {
         unsigned long ret;
         unsigned long bx = (bus << 8) | device_fn;
         unsigned long flags;

         save_flags(flags);
         __asm__(
 #ifdef ABSOLUTE_WITHOUT_ASTERISK
 		"lcall (%%esi)\n\t"
 #else
 		"lcall *(%%esi)\n\t"
 #endif
                 "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 int bus,
 	unsigned int device_fn, unsigned int where, uint8_t value)
 {
 	unsigned long ret;
 	unsigned long bx = (bus << 8) | device_fn;
 	unsigned long flags;

 	save_flags(flags); cli();
 	__asm__(
 #ifdef ABSOLUTE_WITHOUT_ASTERISK
 		"lcall (%%esi)\n\t"
 #else
 		"lcall *(%%esi)\n\t"
 #endif
 		"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 int bus,
 	unsigned int device_fn, unsigned int where, uint16_t value)
 {
 	unsigned long ret;
 	unsigned long bx = (bus << 8) | device_fn;
 	unsigned long flags;

 	save_flags(flags); cli();
 	__asm__(
 #ifdef ABSOLUTE_WITHOUT_ASTERISK
 		"lcall (%%esi)\n\t"
 #else
 		"lcall *(%%esi)\n\t"
 #endif
 		"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 int bus,
 	unsigned int device_fn, unsigned int where, uint32_t value)
 {
 	unsigned long ret;
 	unsigned long bx = (bus << 8) | device_fn;
 	unsigned long flags;

 	save_flags(flags); cli();
 	__asm__(
 #ifdef ABSOLUTE_WITHOUT_ASTERISK
 		"lcall (%%esi)\n\t"
 #else
 		"lcall *(%%esi)\n\t"
 #endif
 		"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__(
 #ifdef ABSOLUTE_WITHOUT_ASTERISK
 			"lcall (%%edi)\n\t"
 #else
 			"lcall *(%%edi)\n\t"
 #endif
 			"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 %hhX.%hhX"
 				" entry at %#X\n", major_revision,
 				minor_revision, pcibios_entry);
 		}
 #endif
 	}
 }

 static void pcibios_init(void)
 {
 	union bios32 *check;
 	unsigned char sum;
 	int i, length;
 	unsigned long bios32_entry = 0;

 	EnterFunction("pcibios_init");
 	/*
 	 * 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 %#X, mail drew@colorado.edu\n",
 				check->fields.revision, check);
 			continue;
 		}
 #if	DEBUG
 		printf("pcibios_init : BIOS32 Service Directory "
 			"structure at %#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 %#X\n", bios32_entry);
 #endif
 				bios32_indirect.address = bios32_entry;
 			}
 		}
 	}
 	if (bios32_entry)
 		check_pcibios();
 	LeaveFunction("pcibios_init");
 }

 #endif	/* CONFIG_PCI_DIRECT not defined*/

 unsigned long pcibios_bus_base(unsigned int bus __unused)
 {
 	/* architecturally this must be 0 */
 	return 0;
 }

 void find_pci(int type, struct pci_device *dev)
 {
 	EnterFunction("find_pci");
 #ifndef	CONFIG_PCI_DIRECT
 	if (!pcibios_entry) {
 		pcibios_init();
 	}
 	if (!pcibios_entry) {
 		printf("pci_init: no BIOS32 detected\n");
 		return;
 	}
 #endif
 	LeaveFunction("find_pci");
 	return scan_pci_bus(type, dev);
 }
	/*
	** 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
	*/
	#define PCBIOS
	#include "grub.h"
	#include "pci.h"

	#ifdef CONFIG_PCI_DIRECT
	#define PCIBIOS_SUCCESSFUL 0x00

	#define DEBUG 0

	/*
	* 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 int bus, unsigned int device_fn,
	unsigned int where, uint8_t *value)
	{
	outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
	*value = inb(0xCFC + (where&3));
	return PCIBIOS_SUCCESSFUL;
	}

	int pcibios_read_config_word (unsigned int bus,
	unsigned int device_fn, unsigned int where, uint16_t *value)
	{
	outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
	*value = inw(0xCFC + (where&2));
	return PCIBIOS_SUCCESSFUL;
	}

	int pcibios_read_config_dword (unsigned int bus, unsigned int device_fn,
	unsigned int where, uint32_t *value)
	{
	outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
	*value = inl(0xCFC);
	return PCIBIOS_SUCCESSFUL;
	}

	int pcibios_write_config_byte (unsigned int bus, unsigned int device_fn,
	unsigned int where, uint8_t value)
	{
	outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
	outb(value, 0xCFC + (where&3));
	return PCIBIOS_SUCCESSFUL;
	}

	int pcibios_write_config_word (unsigned int bus, unsigned int device_fn,
	unsigned int where, uint16_t value)
	{
	outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
	outw(value, 0xCFC + (where&2));
	return PCIBIOS_SUCCESSFUL;
	}

	int pcibios_write_config_dword (unsigned int bus, unsigned int device_fn, unsigned int where, uint32_t value)
	{
	outl(CONFIG_CMD(bus,device_fn,where), 0xCF8);
	outl(value, 0xCFC);
	return PCIBIOS_SUCCESSFUL;
	}

	#undef CONFIG_CMD

	#else /* CONFIG_PCI_DIRECT not defined */

	#if !defined(PCBIOS)
	#error "The pcibios can only be used when the PCBIOS support is compiled in"
	#endif


	#define KERN_CODE_SEG 0X8
	/* Stuff for asm */
	#define save_flags(x) \
	__asm__ __volatile__("pushfl ; popl %0":"=g" (x): /* no input */ :"memory")

	#define cli() __asm__ __volatile__ ("cli": : :"memory")

	#define restore_flags(x) \
	__asm__ __volatile__("pushl %0 ; popfl": /* no output */ :"g" (x):"memory")



	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__(
	#ifdef ABSOLUTE_WITHOUT_ASTERISK
	"lcall (%%edi)"
	#else
	"lcall *(%%edi)"
	#endif
	: "=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 %#X, mail drew@colorado.edu\n",
	service, return_code);
	return 0;
	}
	}

	int pcibios_read_config_byte(unsigned int bus,
	unsigned int device_fn, unsigned int where, uint8_t *value)
	{
	unsigned long ret;
	unsigned long bx = (bus << 8) \| device_fn;
	unsigned long flags;

	save_flags(flags);
	__asm__(
	#ifdef ABSOLUTE_WITHOUT_ASTERISK
	"lcall (%%esi)\n\t"
	#else
	"lcall *(%%esi)\n\t"
	#endif
	"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 int bus,
	unsigned int device_fn, unsigned int where, uint16_t *value)
	{
	unsigned long ret;
	unsigned long bx = (bus << 8) \| device_fn;
	unsigned long flags;

	save_flags(flags);
	__asm__(
	#ifdef ABSOLUTE_WITHOUT_ASTERISK
	"lcall (%%esi)\n\t"
	#else
	"lcall *(%%esi)\n\t"
	#endif
	"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;
	}

	int pcibios_read_config_dword(unsigned int bus,
	unsigned int device_fn, unsigned int where, uint32_t *value)
	{
	unsigned long ret;
	unsigned long bx = (bus << 8) \| device_fn;
	unsigned long flags;

	save_flags(flags);
	__asm__(
	#ifdef ABSOLUTE_WITHOUT_ASTERISK
	"lcall (%%esi)\n\t"
	#else
	"lcall *(%%esi)\n\t"
	#endif
	"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 int bus,
	unsigned int device_fn, unsigned int where, uint8_t value)
	{
	unsigned long ret;
	unsigned long bx = (bus << 8) \| device_fn;
	unsigned long flags;

	save_flags(flags); cli();
	__asm__(
	#ifdef ABSOLUTE_WITHOUT_ASTERISK
	"lcall (%%esi)\n\t"
	#else
	"lcall *(%%esi)\n\t"
	#endif
	"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 int bus,
	unsigned int device_fn, unsigned int where, uint16_t value)
	{
	unsigned long ret;
	unsigned long bx = (bus << 8) \| device_fn;
	unsigned long flags;

	save_flags(flags); cli();
	__asm__(
	#ifdef ABSOLUTE_WITHOUT_ASTERISK
	"lcall (%%esi)\n\t"
	#else
	"lcall *(%%esi)\n\t"
	#endif
	"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 int bus,
	unsigned int device_fn, unsigned int where, uint32_t value)
	{
	unsigned long ret;
	unsigned long bx = (bus << 8) \| device_fn;
	unsigned long flags;

	save_flags(flags); cli();
	__asm__(
	#ifdef ABSOLUTE_WITHOUT_ASTERISK
	"lcall (%%esi)\n\t"
	#else
	"lcall *(%%esi)\n\t"
	#endif
	"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__(
	#ifdef ABSOLUTE_WITHOUT_ASTERISK
	"lcall (%%edi)\n\t"
	#else
	"lcall *(%%edi)\n\t"
	#endif
	"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 %hhX.%hhX"
	" entry at %#X\n", major_revision,
	minor_revision, pcibios_entry);
	}
	#endif
	}
	}

	static void pcibios_init(void)
	{
	union bios32 *check;
	unsigned char sum;
	int i, length;
	unsigned long bios32_entry = 0;

	EnterFunction("pcibios_init");
	/*
	* 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 %#X, mail drew@colorado.edu\n",
	check->fields.revision, check);
	continue;
	}
	#if DEBUG
	printf("pcibios_init : BIOS32 Service Directory "
	"structure at %#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 %#X\n", bios32_entry);
	#endif
	bios32_indirect.address = bios32_entry;
	}
	}
	}
	if (bios32_entry)
	check_pcibios();
	LeaveFunction("pcibios_init");
	}

	#endif /* CONFIG_PCI_DIRECT not defined*/

	unsigned long pcibios_bus_base(unsigned int bus __unused)
	{
	/* architecturally this must be 0 */
	return 0;
	}

	void find_pci(int type, struct pci_device *dev)
	{
	EnterFunction("find_pci");
	#ifndef CONFIG_PCI_DIRECT
	if (!pcibios_entry) {
	pcibios_init();
	}
	if (!pcibios_entry) {
	printf("pci_init: no BIOS32 detected\n");
	return;
	}
	#endif
	LeaveFunction("find_pci");
	return scan_pci_bus(type, dev);
	}