hwpci.c File Reference

#include <freeldr.h>
#include <debug.h>

Include dependency graph for hwpci.c:

Go to the source code of this file.

Functions
	DBG_DEFAULT_CHANNEL (HWDETECT)
static PPCI_IRQ_ROUTING_TABLE	GetPciIrqRoutingTable (VOID)
static BOOLEAN	FindPciBios (PPCI_REGISTRY_INFO BusData)
static VOID	DetectPciIrqRoutingTable (PCONFIGURATION_COMPONENT_DATA BusKey)
VOID	DetectPciBios (PCONFIGURATION_COMPONENT_DATA SystemKey, ULONG *BusNumber)

Function Documentation

DBG_DEFAULT_CHANNEL()

DBG_DEFAULT_CHANNEL

(

HWDETECT

)

DetectPciBios()

VOID DetectPciBios	(	PCONFIGURATION_COMPONENT_DATA	SystemKey,
		ULONG *	BusNumber
	)

Definition at line 175 of file hwpci.c.

{
    PCM_PARTIAL_RESOURCE_LIST PartialResourceList;
    PCM_PARTIAL_RESOURCE_DESCRIPTOR PartialDescriptor;
    PCI_REGISTRY_INFO BusData;
    PCONFIGURATION_COMPONENT_DATA BiosKey;
    ULONG Size;
    PCONFIGURATION_COMPONENT_DATA BusKey;
    ULONG i;

    /* Report the PCI BIOS */
    if (FindPciBios(&BusData))
    {
        /* Set 'Configuration Data' value */
        Size = FIELD_OFFSET(CM_PARTIAL_RESOURCE_LIST, PartialDescriptors);
        PartialResourceList = FrLdrHeapAlloc(Size, TAG_HW_RESOURCE_LIST);
        if (PartialResourceList == NULL)
        {
            ERR("Failed to allocate resource descriptor\n");
            return;
        }

        /* Initialize resource descriptor */
        memset(PartialResourceList, 0, Size);

        /* Create new bus key */
        FldrCreateComponentKey(SystemKey,
                               AdapterClass,
                               MultiFunctionAdapter,
                               0x0,
                               0x0,
                               0xFFFFFFFF,
                               "PCI BIOS",
                               PartialResourceList,
                               Size,
                               &BiosKey);

        /* Increment bus number */
        (*BusNumber)++;

        DetectPciIrqRoutingTable(BiosKey);

        /* Report PCI buses */
        for (i = 0; i < (ULONG)BusData.NoBuses; i++)
        {
            /* Check if this is the first bus */
            if (i == 0)
            {
                /* Set 'Configuration Data' value */
                Size = FIELD_OFFSET(CM_PARTIAL_RESOURCE_LIST,
                                    PartialDescriptors) +
                       sizeof(CM_PARTIAL_RESOURCE_DESCRIPTOR) +
                       sizeof(PCI_REGISTRY_INFO);
                PartialResourceList = FrLdrHeapAlloc(Size, TAG_HW_RESOURCE_LIST);
                if (!PartialResourceList)
                {
                    ERR("Failed to allocate resource descriptor\n");
                    return;
                }

                /* Initialize resource descriptor */
                memset(PartialResourceList, 0, Size);
                PartialResourceList->Version = 1;
                PartialResourceList->Revision = 1;
                PartialResourceList->Count = 1;
                PartialDescriptor = &PartialResourceList->PartialDescriptors[0];
                PartialDescriptor->Type = CmResourceTypeDeviceSpecific;
                PartialDescriptor->ShareDisposition = CmResourceShareUndetermined;
                PartialDescriptor->u.DeviceSpecificData.DataSize = sizeof(PCI_REGISTRY_INFO);
                memcpy(&PartialResourceList->PartialDescriptors[1],
                       &BusData,
                       sizeof(PCI_REGISTRY_INFO));
            }
            else
            {
                /* Set 'Configuration Data' value */
                Size = FIELD_OFFSET(CM_PARTIAL_RESOURCE_LIST,
                                    PartialDescriptors);
                PartialResourceList = FrLdrHeapAlloc(Size, TAG_HW_RESOURCE_LIST);
                if (!PartialResourceList)
                {
                    ERR("Failed to allocate resource descriptor\n");
                    return;
                }

                /* Initialize resource descriptor */
                memset(PartialResourceList, 0, Size);
            }

            /* Create the bus key */
            FldrCreateComponentKey(SystemKey,
                                   AdapterClass,
                                   MultiFunctionAdapter,
                                   0x0,
                                   0x0,
                                   0xFFFFFFFF,
                                   "PCI",
                                   PartialResourceList,
                                   Size,
                                   &BusKey);

            /* Increment bus number */
            (*BusNumber)++;
        }
    }
}

Referenced by PcHwDetect().

DetectPciIrqRoutingTable()

static VOID DetectPciIrqRoutingTable ( PCONFIGURATION_COMPONENT_DATA  BusKey )

static

Definition at line 116 of file hwpci.c.

{
    PCM_PARTIAL_RESOURCE_LIST PartialResourceList;
    PCM_PARTIAL_RESOURCE_DESCRIPTOR PartialDescriptor;
    PPCI_IRQ_ROUTING_TABLE Table;
    PCONFIGURATION_COMPONENT_DATA TableKey;
    ULONG Size;

    Table = GetPciIrqRoutingTable();
    if (Table != NULL)
    {
        TRACE("Table size: %u\n", Table->TableSize);

        /* Set 'Configuration Data' value */
        Size = FIELD_OFFSET(CM_PARTIAL_RESOURCE_LIST, PartialDescriptors) +
               2 * sizeof(CM_PARTIAL_RESOURCE_DESCRIPTOR) + Table->TableSize;
        PartialResourceList = FrLdrHeapAlloc(Size, TAG_HW_RESOURCE_LIST);
        if (PartialResourceList == NULL)
        {
            ERR("Failed to allocate resource descriptor\n");
            return;
        }

        /* Initialize resource descriptor */
        memset(PartialResourceList, 0, Size);
        PartialResourceList->Version = 1;
        PartialResourceList->Revision = 1;
        PartialResourceList->Count = 2;

        PartialDescriptor = &PartialResourceList->PartialDescriptors[0];
        PartialDescriptor->Type = CmResourceTypeBusNumber;
        PartialDescriptor->ShareDisposition = CmResourceShareDeviceExclusive;
        PartialDescriptor->u.BusNumber.Start = 0;
        PartialDescriptor->u.BusNumber.Length = 1;

        PartialDescriptor = &PartialResourceList->PartialDescriptors[1];
        PartialDescriptor->Type = CmResourceTypeDeviceSpecific;
        PartialDescriptor->ShareDisposition = CmResourceShareUndetermined;
        PartialDescriptor->u.DeviceSpecificData.DataSize = Table->TableSize;

        memcpy(&PartialResourceList->PartialDescriptors[2],
               Table,
               Table->TableSize);

        FldrCreateComponentKey(BusKey,
                               PeripheralClass,
                               RealModeIrqRoutingTable,
                               0x0,
                               0x0,
                               0xFFFFFFFF,
                               "PCI Real-mode IRQ Routing Table",
                               PartialResourceList,
                               Size,
                               &TableKey);
    }
}

Referenced by DetectPciBios().

FindPciBios()

static BOOLEAN FindPciBios ( PPCI_REGISTRY_INFO  BusData )

static

Definition at line 79 of file hwpci.c.

{
    REGS  RegsIn;
    REGS  RegsOut;

    RegsIn.b.ah = 0xB1; /* Subfunction B1h */
    RegsIn.b.al = 0x01; /* PCI BIOS present */

    Int386(0x1A, &RegsIn, &RegsOut);

    if (INT386_SUCCESS(RegsOut) &&
        (RegsOut.d.edx == 0x20494350) &&
        (RegsOut.b.ah == 0))
    {
        TRACE("Found PCI bios\n");

        TRACE("AL: %x\n", RegsOut.b.al);
        TRACE("BH: %x\n", RegsOut.b.bh);
        TRACE("BL: %x\n", RegsOut.b.bl);
        TRACE("CL: %x\n", RegsOut.b.cl);

        BusData->NoBuses = RegsOut.b.cl + 1;
        BusData->MajorRevision = RegsOut.b.bh;
        BusData->MinorRevision = RegsOut.b.bl;
        BusData->HardwareMechanism = RegsOut.b.al;

        return TRUE;
    }

    TRACE("No PCI bios found\n");

    return FALSE;
}

Referenced by DetectPciBios().

GetPciIrqRoutingTable()

static PPCI_IRQ_ROUTING_TABLE GetPciIrqRoutingTable ( VOID  )

static

Definition at line 29 of file hwpci.c.

{
    PPCI_IRQ_ROUTING_TABLE Table;
    PUCHAR Ptr;
    ULONG Sum;
    ULONG i;

    Table = (PPCI_IRQ_ROUTING_TABLE)0xF0000;
    while ((ULONG_PTR)Table < 0x100000)
    {
        if (Table->Signature == 'RIP$')
        {
            TRACE("Found signature\n");

            if (Table->TableSize < FIELD_OFFSET(PCI_IRQ_ROUTING_TABLE, Slot) ||
                Table->TableSize % 16 != 0)
            {
                ERR("Invalid routing table size (%u) at 0x%p. Continue searching...\n", Table->TableSize, Table);
                Table = (PPCI_IRQ_ROUTING_TABLE)((ULONG_PTR)Table + 0x10);
                continue;
            }

            Ptr = (PUCHAR)Table;
            Sum = 0;
            for (i = 0; i < Table->TableSize; i++)
            {
                Sum += Ptr[i];
            }

            if ((Sum & 0xFF) != 0)
            {
                ERR("Invalid routing table checksum (%#lx) at 0x%p. Continue searching...\n", Sum & 0xFF, Table);
            }
            else
            {
                TRACE("Valid checksum (%#lx): found routing table at 0x%p\n", Sum & 0xFF, Table);
                return Table;
            }
        }

        Table = (PPCI_IRQ_ROUTING_TABLE)((ULONG_PTR)Table + 0x10);
    }

    ERR("No valid routing table found!\n");

    return NULL;
}

Referenced by DetectPciIrqRoutingTable().