146 lines
4.4 KiB
C
146 lines
4.4 KiB
C
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/*++
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Copyright (c) 1998 Microsoft Corporation
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Module Name:
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pcibios.h
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Abstract:
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This module contains support routines for the Pci Irq Routing.
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Author:
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Santosh Jodh (santoshj) 15-Sept-1998
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Environment:
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Kernel mode
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--*/
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#include "hwdetect.h"
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#include "pcibios.h"
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#define SUCCESSFUL 0x00
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#define BUFFER_TOO_SMALL 0x89
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#define PIRT_SIGNATURE 0x52495024 // $PIR little endian
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#if DBG
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#define DebugPrint(x) \
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{ \
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BlPrint x; \
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BlPrint("...\n"); \
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}
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#else
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#define DebugPrint(x)
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#endif
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typedef struct
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{
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USHORT BufferSize;
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UCHAR far *Buffer;
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}IRQ_ROUTING_OPTIONS, far *FPIRQ_ROUTING_OPTIONS;
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typedef SLOT_INFO far *FPSLOT_INFO;
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FPPCI_IRQ_ROUTING_TABLE
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HwGetRealModeIrqRoutingTable(
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VOID
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)
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{
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IRQ_ROUTING_OPTIONS routeBuffer;
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FPPCI_IRQ_ROUTING_TABLE irqRoutingTable = NULL;
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USHORT pciIrqMask;
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UCHAR returnCode;
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USHORT size;
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#if DBG
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FPSLOT_INFO slotInfo;
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FPSLOT_INFO lastSlot;
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#endif
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routeBuffer.BufferSize = 0;
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routeBuffer.Buffer = NULL;
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returnCode = HwGetPciIrqRoutingOptions( &routeBuffer,
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&pciIrqMask);
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if (returnCode == BUFFER_TOO_SMALL)
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{
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if (routeBuffer.BufferSize)
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{
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DebugPrint(("PCI BIOS returned 0x%x as the size of IRQ routing options buffer", routeBuffer.BufferSize));
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size = routeBuffer.BufferSize + sizeof(PCI_IRQ_ROUTING_TABLE);
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irqRoutingTable = HwAllocateHeap(size, TRUE);
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if (irqRoutingTable)
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{
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routeBuffer.Buffer = (UCHAR far *)irqRoutingTable + sizeof(PCI_IRQ_ROUTING_TABLE);
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returnCode = HwGetPciIrqRoutingOptions( &routeBuffer,
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&pciIrqMask);
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if (returnCode == SUCCESSFUL)
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{
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irqRoutingTable->Signature = PIRT_SIGNATURE;
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irqRoutingTable->TableSize = size;
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irqRoutingTable->Version = 0x0100;
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}
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else
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{
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HwFreeHeap(size);
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irqRoutingTable = NULL;
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DebugPrint(("PCI BIOS returned error code 0x%x while getting the PCI IRQ routing table", returnCode));
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}
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}
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else
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{
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DebugPrint(("Could not allocate %d bytes of memory to read PCI IRQ routing table", size));
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}
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}
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else
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{
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DebugPrint(("PCI BIOS returned 0 size for PCI IRQ Routint table"));
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}
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}
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else
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{
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DebugPrint(("PCI BIOS returned error code 0x%x while getting the PCI IRQ routing table size", returnCode));
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}
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#if DBG
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if (irqRoutingTable)
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{
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BlPrint("*** Real-mode PCI BIOS IRQ Routing Table - BEGIN ***\n\n");
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BlPrint("Exclusive PCI IRQ mask = 0x%x\n", pciIrqMask);
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BlPrint("----------------------------------------------------------------\n");
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BlPrint("Bus Device LnkA Mask LnkB Mask LnkC Mask LnkD Mask Slot\n");
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BlPrint("----------------------------------------------------------------\n");
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for ( slotInfo = (FPSLOT_INFO)((UCHAR far *)irqRoutingTable + sizeof(PCI_IRQ_ROUTING_TABLE)),
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lastSlot = (FPSLOT_INFO)((UCHAR far *)irqRoutingTable + irqRoutingTable->TableSize);
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slotInfo < lastSlot;
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slotInfo++)
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{
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BlPrint("0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n",
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slotInfo->BusNumber,
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slotInfo->DeviceNumber >> 3,
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slotInfo->PinInfo[0].Link, slotInfo->PinInfo[0].InterruptMap,
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slotInfo->PinInfo[1].Link, slotInfo->PinInfo[1].InterruptMap,
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slotInfo->PinInfo[2].Link, slotInfo->PinInfo[2].InterruptMap,
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slotInfo->PinInfo[3].Link, slotInfo->PinInfo[3].InterruptMap,
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slotInfo->SlotNumber);
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}
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BlPrint("\n*** Real-mode PCI BIOS IRQ Routing Table - END ***\n\n");
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BlPrint("press any key to continue...\n");
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while ( !HwGetKey() ) ; // wait until key pressed to continue
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}
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#endif
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return (irqRoutingTable);
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}
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