108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*++
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Copyright (c) 1998 Microsoft Corporation
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Module Name:
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msi.h
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Abstract:
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This file defines structures and data types used by the
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MSI (Message Signalled Interrupt) support
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functionality of the ACPI IRQ arbiter.
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Author:
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Elliot Shmukler (t-ellios) 7-15-98
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Environment:
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Kernel mode only.
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Revision History:
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--*/
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#ifndef _ACPI_MSI_H_
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#define _ACPI_MSI_H_
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//
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// APIC Version Register
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//
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struct _ApicVersion {
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UCHAR Version; // either 0.x or 1.x
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UCHAR Reserved1:7;
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UCHAR MSICapable:1; // is this APIC an MSI receiver?
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UCHAR MaxRedirEntries; // Number of INTIs on unit
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UCHAR Reserved2;
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};
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typedef struct _ApicVersion APIC_VERSION, *PAPIC_VERSION;
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//
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// The Offset from the IO APIC base address of the APIC Assertion Register.
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// It is this register that is the target of MSI writes.
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//
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#define APIC_ASSERTION_REGISTER_OFFSET 0x20
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//
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// Useful info maintained by the arbiter about an individual IO APIC
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//
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typedef struct _IOAPIC_MSI_INFO
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{
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BOOLEAN MSICapable; // Is this IO APIC an MSI receiver?
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ULONG VectorBase; // The Global System Interrupt Vector base for this APIC
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ULONG MaxVectors; // The number of vectors supported by this APIC
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ULONG BaseAddress; // The IO APIC Unit base address
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} IOAPIC_MSI_INFO, *PIOAPIC_MSI_INFO;
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//
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// MSI information structure
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// (basically the APIC information needed for MSI vector allocation
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// & routing)
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//
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typedef struct _MSI_INFORMATION
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{
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BOOLEAN PRTMappingsScanned; // Have we determined the _PRT mapped vectors?
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PRTL_BITMAP PRTMappedVectors; // A BitMap of the vectors mapped by the _PRT
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USHORT NumIOApics; // The number of IO APICs in this system
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IOAPIC_MSI_INFO ApicInfo[ANYSIZE_ARRAY]; // Information about each IO APIC in the system
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} MSI_INFORMATION, *PMSI_INFORMATION;
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//
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// Global variable to hold MSI information
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// (this is non-NULL only if this system supports MSI)
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//
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extern PMSI_INFORMATION MsiInformation;
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//
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// Prototype of a callback used by AcpiArbFindAndProcessEachPRT to initiate the processing
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// of each PRT it finds
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//
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typedef
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VOID
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(*PACPI_ARB_PROCESS_PRT)(IN PSNOBJ);
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// Prototypes from msi.c (used by arbiter)
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VOID AcpiMSIInitializeInfo(VOID);
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BOOLEAN AcpiMSIFindAvailableVector(OUT PULONG Vector);
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BOOLEAN AcpiMSICreateRoutingToken(IN ULONG Vector, IN OUT PROUTING_TOKEN Token);
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VOID AcpiArbFindAndProcessEachPRT(IN PDEVICE_OBJECT Root,
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IN PACPI_ARB_PROCESS_PRT ProcessCallback
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);
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VOID AcpiMSIExtractMappedVectorsFromPRT(IN PNSOBJ prtObj);
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#endif
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