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 BOOLEAN	PcFindPciBios (_Out_ PPCI_REGISTRY_INFO BusData)
static PPCI_IRQ_ROUTING_TABLE	GetPciIrqRoutingTable (VOID)
static VOID	DetectPciIrqRoutingTable (_In_ PCONFIGURATION_COMPONENT_DATA BusKey)
BOOLEAN	PcDetectPciBus (_In_ PCONFIGURATION_COMPONENT_DATA SystemKey, _Inout_ PULONG BusNumber, _Out_ PPCI_REGISTRY_INFO BusData)

Function Documentation

DBG_DEFAULT_CHANNEL()

DBG_DEFAULT_CHANNEL

(

HWDETECT

)

DetectPciIrqRoutingTable()

static VOID DetectPciIrqRoutingTable ( _In_ PCONFIGURATION_COMPONENT_DATA  BusKey )

static

Definition at line 118 of file hwpci.c.

{
    PPCI_IRQ_ROUTING_TABLE Table;
    PCM_PARTIAL_RESOURCE_LIST PartialResourceList;
    PCM_PARTIAL_RESOURCE_DESCRIPTOR PartialDescriptor;
    PCONFIGURATION_COMPONENT_DATA TableKey;
    ULONG Size;
 
    Table = GetPciIrqRoutingTable();
    if (!Table)
        return;
 
    TRACE("Table size: %u\n", Table->TableSize);
 
    /* Set 'Configuration Data' value */
    Size = FIELD_OFFSET(CM_PARTIAL_RESOURCE_LIST, PartialDescriptors[2]) + Table->TableSize;
    PartialResourceList = FrLdrHeapAlloc(Size, TAG_HW_RESOURCE_LIST);
    if (PartialResourceList == NULL)
    {
        ERR("Failed to allocate resource descriptor\n");
        return;
    }
 
    /* Initialize resource descriptor */
    RtlZeroMemory(PartialResourceList, 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;
 
    RtlCopyMemory(&PartialResourceList->PartialDescriptors[2],
                  Table, Table->TableSize);
 
    FldrCreateComponentKey(BusKey,
                           PeripheralClass,
                           RealModeIrqRoutingTable,
                           0,
                           0,
                           0xFFFFFFFF,
                           "PCI Real-mode IRQ Routing Table",
                           PartialResourceList,
                           Size,
                           &TableKey);
}

Referenced by PcDetectPciBus().

GetPciIrqRoutingTable()

static PPCI_IRQ_ROUTING_TABLE GetPciIrqRoutingTable ( VOID  )

static

Definition at line 68 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().

PcDetectPciBus()

BOOLEAN PcDetectPciBus	(	_In_ PCONFIGURATION_COMPONENT_DATA	SystemKey,
		_Inout_ PULONG	BusNumber,
		_Out_ PPCI_REGISTRY_INFO	BusData
	)

Definition at line 175 of file hwpci.c.

{
    PCM_PARTIAL_RESOURCE_LIST PartialResourceList;
    PCONFIGURATION_COMPONENT_DATA BiosKey;
    ULONG Size;
 
    /* Report the PCI BIOS */
    if (!PcFindPciBios(BusData))
        return FALSE;
 
    /* 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 FALSE;
    }
 
    /* Initialize resource descriptor */
    RtlZeroMemory(PartialResourceList, Size);
 
    /* Create new bus key */
    FldrCreateComponentKey(SystemKey,
                           AdapterClass,
                           MultiFunctionAdapter,
                           0,
                           0,
                           0xFFFFFFFF,
                           "PCI BIOS",
                           PartialResourceList,
                           Size,
                           &BiosKey);
 
    /* Increment bus number */
    (*BusNumber)++;
 
    DetectPciIrqRoutingTable(BiosKey);
    return TRUE;
}

Referenced by Pc98HwDetect(), and PcHwDetect().

PcFindPciBios()

static BOOLEAN PcFindPciBios ( _Out_ PPCI_REGISTRY_INFO  BusData )

static

Definition at line 21 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 == ' ICP') &&
        (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->MajorRevision = RegsOut.b.bh;
        BusData->MinorRevision = RegsOut.b.bl;
        BusData->NoBuses = RegsOut.b.cl + 1;
        BusData->HardwareMechanism = RegsOut.b.al;
        return TRUE;
    }
 
    TRACE("No PCI BIOS found\n");
    return FALSE;
}

Referenced by PcDetectPciBus().