path: root/int10/i10_pci.c

/*
 * Copyright 1999 Egbert Eich
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of the authors not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  The authors makes no representations
 * about the suitability of this software for any purpose.  It is provided
 * "as is" without express or implied warranty.
 *
 * THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */
#include <fcntl.h>
#include <unistd.h>
#include <malloc.h>
#include <stdio.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#if defined (__alpha__) || defined (__ia64__)
#include <sys/io.h>
#endif
#include "AsmMacros.h"

#include "pci.h"

#define RESORT 1
#define FIX_ROM 0

/*
 * I'm rather simple mindend - therefore I do a poor man's
 * pci scan without all the fancy stuff that is done in
 * scanpci. However that's all we need.
 */

PciStructPtr PciStruct = NULL;
PciBusPtr PciBuses = NULL;
PciStructPtr CurrentPci = NULL;
PciStructPtr PciList = NULL;
int pciMaxBus = 0;

static CARD32 PciCfg1Addr;

static void readConfigSpaceCfg1(CARD32 bus, CARD32 dev, CARD32 func,
				CARD32 *reg);
static int checkSlotCfg1(CARD32 bus, CARD32 dev, CARD32 func);
static int checkSlotCfg2(CARD32 bus, int dev);
static void readConfigSpaceCfg2(CARD32 bus, int dev, CARD32 *reg);
static CARD8 interpretConfigSpace(CARD32 *reg, int busidx,
				  CARD8 dev, CARD8 func);
static CARD32 findBIOSMap(PciStructPtr pciP, CARD32 *biosSize);
static void restoreMem(PciStructPtr pciP);


#ifdef __alpha__
#define PCI_BUS_FROM_TAG(tag)  (((tag) & 0x00ff0000) >> 16)
#define PCI_DFN_FROM_TAG(tag) (((tag) & 0x0000ff00) >> 8)

#include <asm/unistd.h>

CARD32
axpPciCfgRead(CARD32 tag)
{
    int bus, dfn;
    CARD32 val = 0xffffffff;
    
    bus = PCI_BUS_FROM_TAG(tag);
    dfn = PCI_DFN_FROM_TAG(tag);
    
    syscall(__NR_pciconfig_read, bus, dfn, tag & 0xff, 4, &val);
    return(val);
}

void
axpPciCfgWrite(CARD32 tag, CARD32 val)
{
    int bus, dfn;
    
    bus = PCI_BUS_FROM_TAG(tag);
    dfn = PCI_DFN_FROM_TAG(tag);
    
    syscall(__NR_pciconfig_write, bus, dfn, tag & 0xff, 4, &val);
}

static CARD32 (*readPci)(CARD32 reg) = axpPciCfgRead;
static void (*writePci)(CARD32 reg, CARD32 val) = axpPciCfgWrite;
#else
static CARD32 readPciCfg1(CARD32 reg);
static void writePciCfg1(CARD32 reg, CARD32 val);
#ifndef __ia64__
static CARD32 readPciCfg2(CARD32 reg);
static void writePciCfg2(CARD32 reg, CARD32 val);
#endif

static CARD32 (*readPci)(CARD32 reg) = readPciCfg1;
static void (*writePci)(CARD32 reg, CARD32 val) = writePciCfg1;
#endif

#if defined(__alpha__) || defined(__sparc__)
#define PCI_EN 0x00000000
#else
#define PCI_EN 0x80000000
#endif


static int numbus;
static int hostbridges = 1;
static unsigned long pciMinMemReg = ~0;



void
scan_pci(int pci_cfg_method)
{
    unsigned short configtype;
    
    CARD32 reg[64];
    int busidx;
    CARD8 cardnum;
    CARD8 func;
    int idx;
    
    PciStructPtr pci1;
    PciBusPtr pci_b1,pci_b2;
    
    if(pci_cfg_method) {
      configtype = pci_cfg_method;
    }
    else {
#if defined(__alpha__) || defined(__powerpc__) || defined(__sparc__) || defined(__ia64__)
    configtype = 1;
#else
    CARD8 tmp1, tmp2;
    CARD32 tmp32_1, tmp32_2;
    outb(PCI_MODE2_ENABLE_REG, 0x00);
    outb(PCI_MODE2_FORWARD_REG, 0x00);
    tmp1 = inb(PCI_MODE2_ENABLE_REG);
    tmp2 = inb(PCI_MODE2_FORWARD_REG);
    if ((tmp1 == 0x00) && (tmp2 == 0x00)) {
		configtype = 2;
		readPci = readPciCfg2;
		writePci = writePciCfg2;
    } else {
		tmp32_1 = inl(PCI_MODE1_ADDRESS_REG);
		outl(PCI_MODE1_ADDRESS_REG, PCI_EN);
		tmp32_2 = inl(PCI_MODE1_ADDRESS_REG);
		outl(PCI_MODE1_ADDRESS_REG, tmp32_1);
		if (tmp32_2 == PCI_EN) {
			configtype = 1;
		} else {
			return;
		}
    }
#endif
    }
    
    if (configtype == 1) {
		busidx = 0;
		numbus = 1;
		idx = 0;
		do {
			for (cardnum = 0; cardnum < MAX_DEV_PER_VENDOR_CFG1; cardnum++) {
				func = 0;
				do {
					/* loop over the different functions, if present */
				    if (!checkSlotCfg1(busidx,cardnum,func)) {
						if (!func)
							break;
						else {
							func++;
							continue;
						}
				    }
					readConfigSpaceCfg1(busidx,cardnum,func,reg);
		    
					func = interpretConfigSpace(reg,busidx,
												cardnum,func);
		    
					if (++idx >= MAX_PCI_DEVICES)
						break;
				} while (func < 8);
				if (idx >= MAX_PCI_DEVICES)
				    break;
			}
			if (idx >= MAX_PCI_DEVICES)
			    break;
		} while (++busidx < PCI_MAXBUS);
#if defined(__alpha__) || defined(__powerpc__) || defined(__sparc__) || defined(__ia64__)
		/* don't use outl()  ;-) */
#else
		outl(PCI_MODE1_ADDRESS_REG, 0);
#endif
    } else {
		int slot;
	
		busidx = 0;
		numbus = 1;
		idx = 0;
		do {
			for (slot=0xc0; slot<0xd0; slot++) {
				if (!checkSlotCfg2(busidx,slot))
					break;
				readConfigSpaceCfg2(busidx,slot,reg);
		
				interpretConfigSpace(reg,busidx,
									 slot,0);
				if (++idx >= MAX_PCI_DEVICES)
					break;
			}
			if (idx >= MAX_PCI_DEVICES)
			    break;
		}  while (++busidx < PCI_MAXBUS);
    }
    
    
    pciMaxBus = numbus - 1;
    
    /* link buses */
    pci_b1 = PciBuses;
    while (pci_b1) {
		pci_b2 = PciBuses;
		pci_b1->pBus = NULL;
		while (pci_b2) {
			if (pci_b1->primary == pci_b2->secondary)
				pci_b1->pBus = pci_b2;
			pci_b2 = pci_b2->next;
		}
		pci_b1 = pci_b1->next;
    }
    pci1 = PciStruct;
    while (pci1) {
		pci_b2 = PciBuses;
		pci1->pBus = NULL;
		while (pci_b2) {
			if (pci1->bus == pci_b2->secondary)
				pci1->pBus = pci_b2;
			pci_b2 = pci_b2->next;
		}
		pci1 = pci1->next;
    }
    if (RESORT) {
		PciStructPtr tmp = PciStruct, tmp1;
		PciStruct = NULL;
		while (tmp) {
			tmp1 = tmp->next;
			tmp->next = PciStruct;
			PciStruct = tmp;
			tmp = tmp1;
		}
    }
    PciList = CurrentPci = PciStruct;
}

#ifndef __alpha__
static CARD32
readPciCfg1(CARD32 reg)
{
    CARD32 val;
    
    outl(PCI_MODE1_ADDRESS_REG, reg);
    val = inl(PCI_MODE1_DATA_REG);
    outl(PCI_MODE1_ADDRESS_REG, 0);
    return val;
}

static void
writePciCfg1(CARD32 reg, CARD32 val)
{
    outl(PCI_MODE1_ADDRESS_REG, reg);
    outl(PCI_MODE1_DATA_REG,val);
    outl(PCI_MODE1_ADDRESS_REG, 0);
}

#ifndef __ia64__
static CARD32
readPciCfg2(CARD32 reg)
{
    CARD32 val;
    CARD8 bus = (reg >> 16) & 0xff;
    CARD8 dev = (reg >> 11) & 0x1f;
    CARD8 num = reg & 0xff;
    
    outb(PCI_MODE2_ENABLE_REG, 0xF1);
    outb(PCI_MODE2_FORWARD_REG, bus);
    val = inl((dev << 8) + num);
    outb(PCI_MODE2_ENABLE_REG, 0x00);
    return val;
}

static void
writePciCfg2(CARD32 reg, CARD32 val)
{
    CARD8 bus = (reg >> 16) & 0xff;
    CARD8 dev = (reg >> 11) & 0x1f;
    CARD8 num = reg & 0xff;

    outb(PCI_MODE2_ENABLE_REG, 0xF1);
    outb(PCI_MODE2_FORWARD_REG, bus);
    outl((dev << 8) + num,val);
    outb(PCI_MODE2_ENABLE_REG, 0x00);
}
#endif
#endif

void
pciVideoDisable(void)
{
    /* disable VGA routing on bridges */
    PciBusPtr pbp = PciBuses;
    PciStructPtr pcp = PciStruct;
    
    while (pbp) {
		writePci(pbp->Slot.l | 0x3c, pbp->bctl & ~(CARD32)(8<<16));
		pbp = pbp->next;
    }
    /* disable display devices */
    while (pcp) {
		writePci(pcp->Slot.l | 0x04, pcp->cmd_st & ~(CARD32)3);
		writePci(pcp->Slot.l | 0x30, pcp->RomBase & ~(CARD32)1);
		pcp = pcp->next;
    }
}

void
pciVideoRestore(void)
{
    /* disable VGA routing on bridges */
    PciBusPtr pbp = PciBuses;
    PciStructPtr pcp = PciStruct;
    
    while (pbp) {
		writePci(pbp->Slot.l | 0x3c, pbp->bctl);
		pbp = pbp->next;
    }
    /* disable display devices */
    while (pcp) {
		writePci(pcp->Slot.l | 0x04, pcp->cmd_st);
		writePci(pcp->Slot.l | 0x30, pcp->RomBase);
		pcp = pcp->next;
    }
}

void
EnableCurrent()
{
    PciBusPtr pbp;
    PciStructPtr pcp = CurrentPci;
    
    pciVideoDisable();
    
    pbp = pcp->pBus;
    while (pbp) { /* enable bridges */
		writePci(pbp->Slot.l | 0x3c, pbp->bctl | (CARD32)(8<<16));
		pbp = pbp->pBus;
    }
    writePci(pcp->Slot.l | 0x04, pcp->cmd_st | (CARD32)3);
    writePci(pcp->Slot.l | 0x30, pcp->RomBase | (CARD32)1);
}

CARD8
PciRead8(int offset, CARD32 Slot)
{
    int shift = offset & 0x3;
    offset = offset & 0xFC;
    return ((readPci(Slot | offset) >> (shift << 3)) & 0xff);
}

CARD16
PciRead16(int offset, CARD32 Slot)
{
    int shift = offset & 0x2;
    offset = offset & 0xFC;
    return ((readPci(Slot | offset) >> (shift << 3)) & 0xffff);
}

CARD32
PciRead32(int offset, CARD32 Slot)
{
    offset = offset & 0xFC;
    return (readPci(Slot | offset));
}

void
PciWrite8(int offset, CARD8 byte, CARD32 Slot)
{
    CARD32 val;
    int shift = offset & 0x3;
    offset = offset & 0xFC;
    val = readPci(Slot | offset);
    val &= ~(CARD32)(0xff << (shift << 3));
    val |= byte << (shift << 3);
    writePci(Slot | offset, val);
}

void
PciWrite16(int offset, CARD16 word, CARD32 Slot)
{
    CARD32 val;
    int shift = offset & 0x2;
    offset = offset & 0xFC;
    val = readPci(Slot | offset);
    val &= ~(CARD32)(0xffff << (shift << 3));
    val |= word << (shift << 3);
    writePci(Slot | offset, val);
}

void
PciWrite32(int offset, CARD32 lg, CARD32 Slot)
{
    offset = offset & 0xFC;
    writePci(Slot | offset, lg);
}

int
mapPciRom(PciStructPtr pciP)
{
    unsigned long RomBase = 0;
    int mem_fd;
    unsigned char *mem, *ptr;
    unsigned char *scratch = NULL;
    int length = 0;
    CARD32 biosSize = 0x1000000;
    CARD32 enablePci = 0;	/* to keep gcc happy */

    if (!pciP)
      pciP = CurrentPci;

	if (FIX_ROM) {
		RomBase = findBIOSMap(pciP, &biosSize);
		if (!RomBase) {
			RomBase = pciP->RomBase & ~(CARD32)0xFF;
		}
	}  else {
		RomBase = pciP->RomBase & ~(CARD32)0xFF;
	    if (~RomBase + 1 < biosSize || !RomBase)
			RomBase = findBIOSMap(pciP, &biosSize);
	}

	if ((mem_fd = open(MEM_FILE,O_RDONLY))<0) {
		perror("opening memory");
		restoreMem(pciP);
		return (0);
	}

	PciWrite32(0x30,RomBase | 1,pciP->Slot.l);

#ifdef __alpha__
	mem = ptr = (unsigned char *)mmap(0, biosSize, PROT_READ,
									  MAP_SHARED, mem_fd, RomBase | _bus_base());
#else
	mem = ptr = (unsigned char *)mmap(0, biosSize, PROT_READ,
									  MAP_SHARED, mem_fd, RomBase);
#endif
	if (pciP != CurrentPci) {
	  enablePci = PciRead32(0x4,pciP->Slot.l);
	  PciWrite32(0x4,enablePci | 0x2,pciP->Slot.l);
	}

	while ( *ptr == 0x55 && *(ptr+1) == 0xAA) {
		unsigned short data_off = *(ptr+0x18) | (*(ptr+0x19)<< 8);
		unsigned char *data = ptr + data_off;
		unsigned char type;
		int i;

		if (*data!='P' || *(data+1)!='C' || *(data+2)!='I' || *(data+3)!='R') {
			break;
		}
		type = *(data + 0x14);
		
		if (type != 0)  { /* not PC-AT image: find next one */
			unsigned int image_length;
			unsigned char indicator = *(data + 0x15);
			if (indicator & 0x80) /* last image */
				break;
			image_length = (*(data + 0x10)
							| (*(data + 0x11) << 8)) << 9;
			ptr = ptr + image_length;
			continue;
		}
		/* OK, we have a PC Image */
		length = (*(ptr + 2) << 9);
		scratch = (unsigned char *)malloc(length);
		/* don't use memcpy() here: Reading from bus! */
		for (i=0;i<length;i++)
			*(scratch + i)=*(ptr + i);
		break;
	}

	if (pciP != CurrentPci)
	  PciWrite32(0x4,enablePci,pciP->Slot.l);

	/* unmap/close/disable PCI bios mem */
	munmap(mem, biosSize);
	close(mem_fd);
	/* disable and restore mapping */
	writePci(pciP->Slot.l | 0x30, pciP->RomBase & ~(CARD32)1);

	if (scratch && length) {
		memcpy((unsigned char *)V_BIOS, scratch, length);
		free(scratch);
	}
	
	restoreMem(pciP);
	return length;
}

CARD32
findPci(CARD16 slotBX)
{
	CARD32 slot = slotBX << 8;

	if (slot == (CurrentPci->Slot.l & ~PCI_EN))
		return (CurrentPci->Slot.l | PCI_EN);
	else {
#if !SHOW_ALL_DEV
		PciBusPtr pBus = CurrentPci->pBus;
		while (pBus) {
			if (slot == (pBus->Slot.l & ~PCI_EN))
				return pBus->Slot.l | PCI_EN;
			pBus = pBus->next;
		}
#else
		PciStructPtr pPci = PciStruct;
		while (pPci) {
			if (slot == (pPci->Slot.l & ~PCI_EN))
				return pPci->Slot.l | PCI_EN;
			pPci = pPci->next;
		}
#endif
	}
	return 0;
}

CARD16
pciSlotBX(PciStructPtr pPci)
{
	return (CARD16)((pPci->Slot.l >> 8) & 0xFFFF);
}

PciStructPtr
findPciDevice(CARD16 vendorID, CARD16 deviceID, char n)
{
    PciStructPtr pPci = CurrentPci;
    n++;

    while (pPci)  {
        if ((pPci->VendorID == vendorID) && (pPci->DeviceID == deviceID)) {
	    if (!(--n)) break;
        }
	pPci = pPci->next;
    }
    return pPci;
}

PciStructPtr
findPciClass(CARD8 intf, CARD8 subClass, CARD16 class, char n)
{
    PciStructPtr pPci = CurrentPci;
    n++;

    while (pPci)  {
        if ((pPci->Interface == intf) && (pPci->SubClass == subClass)
	     && (pPci->BaseClass == class)) {
	    if (!(--n)) break;
        }
	pPci = pPci->next;
    }
    return pPci;
}

static void
readConfigSpaceCfg1(CARD32 bus, CARD32 dev, CARD32 func, CARD32 *reg)
{
	CARD32   config_cmd = PCI_EN | (bus<<16) |
	  (dev<<11) | (func<<8);
	int i;

	for (i = 0; i<64;i+=4) {
#ifdef __alpha__
		reg[i] = axpPciCfgRead(config_cmd | i);
#else
		outl(PCI_MODE1_ADDRESS_REG, config_cmd | i);
		reg[i] = inl(PCI_MODE1_DATA_REG);
#endif

	}
}

static int
checkSlotCfg1(CARD32 bus, CARD32 dev, CARD32 func)
{
	CARD32    config_cmd = PCI_EN | (bus<<16) |
	  (dev<<11) | (func<<8);
	CARD32 reg;
#ifdef __alpha__
		reg = axpPciCfgRead(config_cmd);
#else
		outl(PCI_MODE1_ADDRESS_REG, config_cmd);
		reg = inl(PCI_MODE1_DATA_REG);
#endif
	if (reg != 0xFFFFFFFF)
		return 1;
	else
		return 0;
}

static int
checkSlotCfg2(CARD32 bus, int dev)
{
	CARD32 val;

	outb(PCI_MODE2_ENABLE_REG, 0xF1);
	outb(PCI_MODE2_FORWARD_REG, bus);
	val = inl(dev << 8);
	outb(PCI_MODE2_FORWARD_REG, 0x00);
	outb(PCI_MODE2_ENABLE_REG, 0x00);
	if (val == 0xFFFFFFFF)
		return 0;
	if (val == 0xF0F0F0F0)
		return 0;
	return 1;
}

static void
readConfigSpaceCfg2(CARD32 bus, int dev, CARD32 *reg)
{
	int i;

	outb(PCI_MODE2_ENABLE_REG, 0xF1);
	outb(PCI_MODE2_FORWARD_REG, bus);
	for (i = 0; i<64;i+=4) {
		reg[i] = inl((dev << 8) + i);
	}
	outb(PCI_MODE2_ENABLE_REG, 0x00);
}

static CARD8
interpretConfigSpace(CARD32 *reg, int busidx, CARD8 dev, CARD8 func)
{
	CARD32 config_cmd;
	CARD16 vendor, device;
	CARD8 baseclass, subclass;
	CARD8 primary, secondary;
	CARD8 header, interface;
	int i;
	
	config_cmd = PCI_EN | busidx<<16 |
		(dev<<11) | (func<<8);

	for (i = 0x10; i < 0x28; i+=4) {
		if (IS_MEM32(reg[i]))
			if ((reg[i] & 0xFFFFFFF0) < pciMinMemReg)
				pciMinMemReg = (reg[i] & 0xFFFFFFF0);
#ifdef __alpha__
		if (IS_MEM64(reg[i])) {
		        unsigned long addr = reg[i] | 
			  (unsigned long)(reg[i+4]) << 32;
			if ((addr & ~0xfL) < pciMinMemReg)
				pciMinMemReg = (addr & ~0xfL);
			i+=4;
		}
#endif
	}
	vendor = reg[0] & 0xFFFF;
	device = reg[0] >> 16;
	baseclass = reg[8] >> 24;
	subclass = (reg[8] >> 16) & 0xFF;
	interface = (reg[8] >> 8) & 0xFF;

	header = (reg[0x0c] >> 16) & 0xff;
	if (BRIDGE_CLASS(baseclass)) {
		if (BRIDGE_PCI_CLASS(subclass)) {
			PciBusPtr pbp = malloc(sizeof(PciBusRec));
			primary = reg[0x18] & 0xFF;
			secondary = (reg[0x18] >> 8) & 0xFF;
			pbp->bctl = reg[0x3c];
			pbp->primary = primary;
			pbp->secondary = secondary;
			pbp->Slot.l = config_cmd;
			pbp->next = PciBuses;
			PciBuses = pbp;
			numbus++;
		} else if (BRIDGE_HOST_CLASS(subclass)
				   && (hostbridges++ > 1)) {
			numbus++;
		}
	} else if (VIDEO_CLASS(baseclass,subclass)) {
		PciStructPtr pcp = malloc(sizeof(PciStructRec));
		pcp->RomBase = reg[0x30];
		pcp->cmd_st = reg[4];
		pcp->active = (reg[4] & 0x03) == 3 ? 1 : 0;
		pcp->VendorID = vendor;
		pcp->DeviceID = device;
		pcp->Interface = interface;
		pcp->BaseClass = baseclass;
		pcp->SubClass = subclass;
		pcp->Slot.l = config_cmd;
		pcp->bus = busidx;
		pcp->dev = dev;
		pcp->func = func;
		pcp->next = PciStruct;
		PciStruct = pcp;
	}
	if ((func == 0)
		&& ((header & PCI_MULTIFUNC_DEV) == 0))
		func = 8;
	else
		func++;
	return func;
}

static CARD32 remapMEM_val;
static int remapMEM_num;

static int /* map it on some other video device */
remapMem(PciStructPtr pciP, int num, CARD32 size)
{
	PciStructPtr pciPtr = PciStruct;
	int i;
	CARD32 org;
	CARD32 val;
	CARD32 size_n;
	
	org = PciRead32(num + 0x10,pciP->Slot.l);
	
	while (pciPtr) {
		for (i = 0; i < 20; i=i+4) {

			val = PciRead32(i + 0x10,pciPtr->Slot.l);
			/* don't map it on itself */
			if ((org & 0xfffffff0) == (val & 0xfffffff0))
				continue;
			if (val && !(val & 1))
				PciWrite32(i + 0x10,0xffffffff,pciPtr->Slot.l);
			else
				continue;
			size_n = PciRead32(i + 0x10,pciPtr->Slot.l);
			PciWrite32(i + 0x10,val,pciPtr->Slot.l);
			size_n = ~(CARD32)(size_n  & 0xfffffff0) + 1;
					
			if (size_n >= size) {
				PciWrite32(num + 0x10,val,pciP->Slot.l);
				return 1;
			}
		}
		pciPtr = pciPtr->next;
	}
	/* last resort: try to go below lowest PCI mem address */
	val = ((pciMinMemReg & ~(CARD32)(size - 1)) - size);
	if (val > 0x7fffffff) {
		PciWrite32(num + 0x10,val, pciP->Slot.l);
		return 1;
	}

	return 0;
}

static void
restoreMem(PciStructPtr pciP)
{
	if (remapMEM_val == 0) return;
	PciWrite32(remapMEM_num + 0x10,remapMEM_val,pciP->Slot.l);
	return;
}

static CARD32
findBIOSMap(PciStructPtr pciP, CARD32 *biosSize)
{
	PciStructPtr pciPtr = PciStruct;
	int i;
	CARD32 val;
	CARD32 size = 4*1024;	/* should be fixed: size seems _really_ to be undefined below */
	
	PciWrite32(0x30,0xffffffff,pciP->Slot.l);
	*biosSize = PciRead32(0x30,pciP->Slot.l);
	PciWrite32(0x30,pciP->RomBase,pciP->Slot.l);
	*biosSize = ~(*biosSize & 0xFFFFFF00) + 1;
	if (*biosSize > (1024 * 1024 * 16)) {
	  *biosSize = 1024 * 1024 * 16;
	}
	while (pciPtr) {
		if (pciPtr->bus != pciP->bus) {
			pciPtr = pciPtr->next;
			continue;
		}
		for (i = 0; i < 20; i=i+4) {
			
			val = PciRead32(i + 0x10,pciPtr->Slot.l);
			if (!(val & 1))
	
			PciWrite32(i + 0x10,0xffffffff,pciPtr->Slot.l);
			else
				continue;
			size = PciRead32(i + 0x10,pciPtr->Slot.l);
			PciWrite32(i + 0x10,val,pciPtr->Slot.l);
			size = ~(CARD32)(size & 0xFFFFFFF0) + 1;
			if (size >= *biosSize) {
				if (pciP == pciPtr) { /* if same device remap ram*/
					if (!(remapMem(pciP,i,size)))
						continue;
					remapMEM_val = val;
					remapMEM_num = i;
				} else {
					remapMEM_val = 0;
				}
				return val & 0xFFFFFF00;
			}
		}
		pciPtr = pciPtr->next;
	}
	remapMEM_val = 0;
	/* very last resort */
	if (pciP->bus == 0 && (pciMinMemReg > *biosSize)) 
	  return (pciMinMemReg - size) & ~(size - 1);
	  
	return 0;
}

int
cfg1out(CARD16 addr, CARD32 val)
{
  if (addr == 0xCF8) {
    PciCfg1Addr = val;
    return 1;
  } else if (addr == 0xCFC) {
    writePci(PciCfg1Addr, val);
    return 1;
  }
  return 0;
}

int 
cfg1in(CARD16 addr, CARD32 *val)
{
  if (addr == 0xCF8) {
    *val = PciCfg1Addr;
    return 1;
  } else if (addr == 0xCFC) {
    *val = readPci(PciCfg1Addr);
    return 1;
  }
  return 0;
}

PciStructPtr
findPciByIDs(int bus, int dev, int func)
{
  PciStructPtr pciP = PciList;
  
  while (pciP) {
    if (pciP->bus == (unsigned) bus && pciP->dev == (unsigned) dev && pciP->func == (unsigned) func)
      return pciP;
    pciP = pciP->next;
  }
  return NULL;
}