#include <pshpack1.h>
#include <poppack.h>

Include dependency graph for x2apicp.h:

This graph shows which files directly or indirectly include this file:

Classes
union	_X2APIC_BASE_ADDRESS_REGISTER

union	_X2APIC_INTERRUPT_COMMAND_REGISTER

Macros
#define	MSR_APIC_BASE 0x0000001B

#define	X2APIC_MSR_BASE 0x00000800

#define	X2APIC_MSR_ICR 0x00000830

#define	X2APIC_MSR_SELF_IPI 0x0000083F

#define	CPUID_X2APIC_FEATURE_BIT 21

Typedefs
typedef union _X2APIC_BASE_ADDRESS_REGISTER	X2APIC_BASE_ADDRESS_REGISTER

typedef enum _X2APIC_REGISTER	X2APIC_REGISTER

typedef union _X2APIC_INTERRUPT_COMMAND_REGISTER	X2APIC_INTERRUPT_COMMAND_REGISTER

Enumerations
enum	_X2APIC_REGISTER { X2APIC_ID_REG = 0x0020 , X2APIC_EOI_REG = 0x00B0 , X2APIC_SIVR_REG = 0x00F0 , X2APIC_ICR0_REG = 0x0300 }

Functions
FORCEINLINE X2APIC_REGISTER	X2ApicMsrFromRegister (_In_ X2APIC_REGISTER Register)

FORCEINLINE ULONG	X2ApicRead (_In_ X2APIC_REGISTER Register)

FORCEINLINE VOID	X2ApicWrite (_In_ X2APIC_REGISTER Register, _In_ ULONG Value)

FORCEINLINE VOID	X2ApicWriteIcr (_In_ X2APIC_INTERRUPT_COMMAND_REGISTER IcrValue)

BOOLEAN NTAPI	X2ApicIsSupported (VOID)
	Checks whether the current processor supports x2APIC mode.

VOID NTAPI	X2ApicEnable (VOID)
	Switches the current processor's local APIC into x2APIC mode.

Macro Definition Documentation

◆ CPUID_X2APIC_FEATURE_BIT

#define CPUID_X2APIC_FEATURE_BIT 21

Definition at line 14 of file x2apicp.h.

◆ MSR_APIC_BASE

#define MSR_APIC_BASE 0x0000001B

Definition at line 10 of file x2apicp.h.

◆ X2APIC_MSR_BASE

#define X2APIC_MSR_BASE 0x00000800

Definition at line 11 of file x2apicp.h.

◆ X2APIC_MSR_ICR

#define X2APIC_MSR_ICR 0x00000830

Definition at line 12 of file x2apicp.h.

◆ X2APIC_MSR_SELF_IPI

#define X2APIC_MSR_SELF_IPI 0x0000083F

Definition at line 13 of file x2apicp.h.

Typedef Documentation

◆ X2APIC_BASE_ADDRESS_REGISTER

typedef union _X2APIC_BASE_ADDRESS_REGISTER X2APIC_BASE_ADDRESS_REGISTER

◆ X2APIC_INTERRUPT_COMMAND_REGISTER

typedef union _X2APIC_INTERRUPT_COMMAND_REGISTER X2APIC_INTERRUPT_COMMAND_REGISTER

◆ X2APIC_REGISTER

typedef enum _X2APIC_REGISTER X2APIC_REGISTER

Enumeration Type Documentation

◆ _X2APIC_REGISTER

enum _X2APIC_REGISTER

Enumerator
X2APIC_ID_REG
X2APIC_EOI_REG
X2APIC_SIVR_REG
X2APIC_ICR0_REG

Definition at line 33 of file x2apicp.h.

{
    X2APIC_ID_REG = 0x0020,
    X2APIC_EOI_REG = 0x00B0,
    X2APIC_SIVR_REG = 0x00F0,
    X2APIC_ICR0_REG = 0x0300,
} X2APIC_REGISTER;

Function Documentation

◆ X2ApicEnable()

VOID NTAPI X2ApicEnable ( VOID )

Switches the current processor's local APIC into x2APIC mode.

Remarks: This must only be called after verifying support with X2ApicIsSupported, and before you try to do any MSR based register access.

Returns: None.

Definition at line 51 of file x2apic.c.

{
    X2APIC_BASE_ADDRESS_REGISTER BaseRegister;
 
    BaseRegister.LongLong = __readmsr(MSR_APIC_BASE);
 
    /* xAPIC (Enable) must already be set before x2APIC can be enabled */
    BaseRegister.Enable = 1;
    BaseRegister.EnableX2Apic = 1;
 
    __writemsr(MSR_APIC_BASE, BaseRegister.LongLong);
}

◆ X2ApicIsSupported()

BOOLEAN NTAPI X2ApicIsSupported ( VOID )

Checks whether the current processor supports x2APIC mode.

Returns: TRUE if CPUID.01H:ECX.x2APIC[bit 21] is set, FALSE otherwise.

Definition at line 28 of file x2apic.c.

{
    CPUID_VERSION_INFO_REGS VersionInfo;
 
    __cpuid(VersionInfo.AsInt32, CPUID_VERSION_INFO);
 
    return VersionInfo.Ecx.Bits.x2APIC != 0;
}

◆ X2ApicMsrFromRegister()

FORCEINLINE X2APIC_REGISTER X2ApicMsrFromRegister ( _In_ X2APIC_REGISTER Register )

Definition at line 64 of file x2apicp.h.

{
    return (X2APIC_REGISTER)(X2APIC_MSR_BASE + (Register / 0x10));
}

Referenced by X2ApicRead(), and X2ApicWrite().

◆ X2ApicRead()

FORCEINLINE ULONG X2ApicRead ( _In_ X2APIC_REGISTER Register )

Definition at line 72 of file x2apicp.h.

{
    return (ULONG)__readmsr(X2ApicMsrFromRegister(Register));
}

◆ X2ApicWrite()

FORCEINLINE VOID X2ApicWrite	(	_In_ X2APIC_REGISTER	Register,
		_In_ ULONG	Value
	)

Definition at line 80 of file x2apicp.h.

{
    __writemsr(X2ApicMsrFromRegister(Register), Value);
}

◆ X2ApicWriteIcr()

FORCEINLINE VOID X2ApicWriteIcr ( _In_ X2APIC_INTERRUPT_COMMAND_REGISTER IcrValue )

Definition at line 89 of file x2apicp.h.

{
    __writemsr(X2APIC_MSR_ICR, IcrValue.LongLong);
}

Classes

Macros

Typedefs

Enumerations

Functions