Apic.c File Reference

#include "pch.h"

Functions
VOID	XApicIcrWrite (UINT32 Low, UINT32 High)
	Trigger NMI on XAPIC.
VOID	X2ApicIcrWrite (UINT32 Low, UINT32 High)
	Trigger NMI on X2APIC.
VOID	ApicTriggerGenericNmi ()
	Trigger NMI on X2APIC or APIC based on Current system.
BOOLEAN	ApicInitialize ()
	Initialize APIC.
VOID	ApicUninitialize ()
	Uninitialize APIC.
VOID	ApicSelfIpi (UINT32 Vector)
	Self IPI the current core.

Function Documentation

ApicInitialize()

BOOLEAN ApicInitialize

(

)

Initialize APIC.

Returns

BOOLEAN

{
    UINT64           ApicBaseMSR;
    PHYSICAL_ADDRESS PaApicBase;
 
    ApicBaseMSR = __readmsr(0x1B);
    if (!(ApicBaseMSR & (1 << 11)))
        return FALSE;
 
    if (ApicBaseMSR & (1 << 10))
    {
        g_CompatibilityCheck.IsX2Apic = TRUE;
        return FALSE;
    }
    else
    {
        PaApicBase.QuadPart = ApicBaseMSR & 0xFFFFFF000;
        g_ApicBase          = MmMapIoSpace(PaApicBase, 0x1000, MmNonCached);
 
        if (!g_ApicBase)
            return FALSE;
 
        g_CompatibilityCheck.IsX2Apic = FALSE;
    }
    return TRUE;
}

ApicSelfIpi()

VOID ApicSelfIpi

(

UINT32

Vector

)

Self IPI the current core.

Parameters

Vector

Returns

VOID

{
    //
    // Check and apply self-IPI to x2APIC and xAPIC
    //
    if (g_CompatibilityCheck.IsX2Apic)
    {
        X2ApicIcrWrite(APIC_DEST_SELF | APIC_DEST_PHYSICAL | APIC_DM_FIXED | Vector, 0);
    }
    else
    {
        XApicIcrWrite(APIC_DEST_SELF | APIC_DEST_PHYSICAL | APIC_DM_FIXED | Vector, 0);
    }
}

ApicTriggerGenericNmi()

VOID ApicTriggerGenericNmi

(

)

Trigger NMI on X2APIC or APIC based on Current system.

Returns

VOID

{
    if (g_CompatibilityCheck.IsX2Apic)
    {
        X2ApicIcrWrite((4 << 8) | (1 << 14) | (3 << 18), 0);
    }
    else
    {
        XApicIcrWrite((4 << 8) | (1 << 14) | (3 << 18), 0);
    }
}

ApicUninitialize()

VOID ApicUninitialize

(

)

Uninitialize APIC.

Returns

VOID

{
    //
    // Unmap I/O Base
    //
    if (g_ApicBase)
        MmUnmapIoSpace(g_ApicBase, 0x1000);
}

X2ApicIcrWrite()

VOID X2ApicIcrWrite	(	UINT32	Low,
		UINT32	High )

Trigger NMI on X2APIC.

Parameters

Low
High

Returns

VOID

{
    __writemsr(X2_MSR_BASE + TO_X2(ICROffset), ((UINT64)High << 32) | Low);
}

XApicIcrWrite()

VOID XApicIcrWrite	(	UINT32	Low,
		UINT32	High )

Trigger NMI on XAPIC.

Parameters

Low
High

Returns

VOID

{
    *(UINT32 *)((uintptr_t)g_ApicBase + ICROffset + 0x10) = High;
    *(UINT32 *)((uintptr_t)g_ApicBase + ICROffset)        = Low;
}