path: root/private/ntos/nthals/halast/i386/astproc.c

/*++

Copyright (c) 1991  Microsoft Corporation
Copyright (c) 1992  AST Research Inc.

Module Name:

    spsproc.c

Abstract:

    AST EBI2 Start Next Processor c code.

    This module implements the initialization of the system dependent
    functions that define the Hardware Architecture Layer (HAL) for an
    AST Manhattan EBI2 system.

Author:

    Ken Reneris (kenr) 22-Jan-1991

Environment:

    Kernel mode only.

Revision History:

    Bob Beard (v-bobb) 3-Aug-1992

--*/

#include "halp.h"
#include "astdisp.h"

UCHAR   HalName[] = "AST Manhattan MP HAL";

VOID
HalpMapCR3 (
    IN ULONG VirtAddress,
    IN PVOID PhysicalAddress,
    IN ULONG Length
    );

ULONG
HalpBuildTiledCR3 (
    IN PKPROCESSOR_STATE    ProcessorState
    );

VOID
HalpFreeTiledCR3 (
    VOID
    );


#define MAX_PT              8
#define LOW_MEMORY          0x000100000
extern __cdecl StartPx_PMStub();

PUCHAR  MpLowStub;                  // pointer to low memory bootup stub
PVOID   MpLowStubPhysicalAddress;   // pointer to low memory bootup stub
PUCHAR  MppIDT;                     // pointer to physical memory 0:0
PVOID   MpFreeCR3[MAX_PT];          // remember pool memory to free

extern  ULONG   HalpIpiClock;       // bitmask of processors to ipi



BOOLEAN
HalpInitMP (
    IN ULONG Phase,
    IN PLOADER_PARAMETER_BLOCK LoaderBlock
    )
/*++

Routine Description:
    Allows MP initialization from HalInitSystem.

Arguments:
    Same as HalInitSystem

Return Value:
    none.

--*/
{
    PKPCR   pPCR;

    pPCR = KeGetPcr();

    if (Phase == 0) {
        MppIDT   = HalpMapPhysicalMemory (0, 1);


        //
        //  Allocate some low memory for processor bootup stub
        //

        MpLowStubPhysicalAddress = (PVOID)HalpAllocPhysicalMemory (LoaderBlock,
                                            LOW_MEMORY, 1, FALSE);

        if (!MpLowStubPhysicalAddress)
            return TRUE;

        MpLowStub = (PCHAR) HalpMapPhysicalMemory (MpLowStubPhysicalAddress, 1);
        return TRUE;

    }
}

VOID
HalReportResourceUsage (
    VOID
    )
/*++

Routine Description:
    The registery is now enabled - time to report resources which are
    used by the HAL.

Arguments:

Return Value:

--*/
{
    ANSI_STRING     AHalName;
    UNICODE_STRING  UHalName;

    HalInitSystemPhase2();

    RtlInitAnsiString (&AHalName, HalName);
    RtlAnsiStringToUnicodeString (&UHalName, &AHalName, TRUE);

    HalpReportResourceUsage (
        &UHalName,          // descriptive name
        Eisa                // Manhattan's are Eisa machines
    );

    RtlFreeUnicodeString (&UHalName);
}



BOOLEAN
HalAllProcessorsStarted (
    VOID
    )
{
    return TRUE;
}



VOID
HalpResetAllProcessors (
    VOID
    )
{
    // Just return, that will invoke the standard PC reboot code
}

ULONG
HalpBuildTiledCR3 (
    IN PKPROCESSOR_STATE    ProcessorState
    )
/*++

Routine Description:
    When the x86 processor is reset it starts in real-mode.  In order to
    move the processor from real-mode to protected mode with flat addressing
    the segment which loads CR0 needs to have it's linear address mapped
    to machine the phyiscal location of the segment for said instruction so
    the processor can continue to execute the following instruction.

    This function is called to built such a tiled page directory.  In
    addition, other flat addresses are tiled to match the current running
    flat address for the new state.  Once the processor is in flat mode,
    we move to a NT tiled page which can then load up the remaining processors
    state.

Arguments:
    ProcessorState  - The state the new processor should start in.

Return Value:
    Physical address of Tiled page directory


--*/
{
#define GetPdeAddress(va) ((PHARDWARE_PTE)((((((ULONG)(va)) >> 22) & 0x3ff) << 2) + (PUCHAR)MpFreeCR3[0]))
#define GetPteAddress(va) ((PHARDWARE_PTE)((((((ULONG)(va)) >> 12) & 0x3ff) << 2) + (PUCHAR)pPageTable))

// bugbug kenr 27mar92 - fix physical memory usage!

    MpFreeCR3[0] = ExAllocatePool (NonPagedPool, PAGE_SIZE);
    RtlZeroMemory (MpFreeCR3[0], PAGE_SIZE);

    //
    //  Map page for real mode stub (one page)
    //
    HalpMapCR3 ((ULONG) MpLowStubPhysicalAddress,
                MpLowStubPhysicalAddress,
                PAGE_SIZE);

    //
    //  Map page for protect mode stub (one page)
    //
    HalpMapCR3 ((ULONG) &StartPx_PMStub, NULL, 0x1000);


    //
    //  Map page(s) for processors GDT
    //
    HalpMapCR3 (ProcessorState->SpecialRegisters.Gdtr.Base, NULL,
                ProcessorState->SpecialRegisters.Gdtr.Limit);


    //
    //  Map page(s) for processors IDT
    //
    HalpMapCR3 (ProcessorState->SpecialRegisters.Idtr.Base, NULL,
                ProcessorState->SpecialRegisters.Idtr.Limit);

    return MmGetPhysicalAddress (MpFreeCR3[0]).LowPart;
}


VOID
HalpMapCR3 (
    IN ULONG VirtAddress,
    IN PVOID PhysicalAddress,
    IN ULONG Length
    )
/*++

Routine Description:
    Called to build a page table entry for the passed page directory.
    Used to build a tiled page directory with real-mode & flat mode.

Arguments:
    VirtAddress     - Current virtual address
    PhysicalAddress - Optional. Physical address to be mapped to, if passed
                      as a NULL then the physical address of the passed
                      virtual address is assumed.
    Length          - number of bytes to map

Return Value:
    none.

--*/
{
    ULONG         i;
    PHARDWARE_PTE PTE;
    PVOID         pPageTable;
    PHYSICAL_ADDRESS pPhysicalPage;


    while (Length) {
        PTE = GetPdeAddress (VirtAddress);
        if (!PTE->PageFrameNumber) {
            pPageTable = ExAllocatePool (NonPagedPool, PAGE_SIZE);
            RtlZeroMemory (pPageTable, PAGE_SIZE);

            for (i=0; i<MAX_PT; i++) {
                if (!MpFreeCR3[i]) {
                    MpFreeCR3[i] = pPageTable;
                    break;
                }
            }
            ASSERT (i<MAX_PT);

            pPhysicalPage = MmGetPhysicalAddress (pPageTable);
            PTE->PageFrameNumber = (pPhysicalPage.LowPart >> PAGE_SHIFT);
            PTE->Valid = 1;
            PTE->Write = 1;
        }

        pPhysicalPage.LowPart = PTE->PageFrameNumber << PAGE_SHIFT;
        pPhysicalPage.HighPart = 0;
        pPageTable = MmMapIoSpace (pPhysicalPage, PAGE_SIZE, TRUE);

        PTE = GetPteAddress (VirtAddress);

        if (!PhysicalAddress) {
            PhysicalAddress = (PVOID)MmGetPhysicalAddress ((PVOID)VirtAddress).LowPart;
        }

        PTE->PageFrameNumber = ((ULONG) PhysicalAddress >> PAGE_SHIFT);
        PTE->Valid = 1;
        PTE->Write = 1;

        MmUnmapIoSpace (pPageTable, PAGE_SIZE);

        PhysicalAddress = 0;
        VirtAddress += PAGE_SIZE;
        if (Length > PAGE_SIZE) {
            Length -= PAGE_SIZE;
        } else {
            Length = 0;
        }
    }
}



VOID
HalpFreeTiledCR3 (
    VOID
    )
/*++

Routine Description:
    Free's any memory allocated when the tiled page directory was built.

Arguments:
    none

Return Value:
    none
--*/
{
    ULONG   i;

    for (i=0; MpFreeCR3[i]; i++) {
        ExFreePool (MpFreeCR3[i]);
        MpFreeCR3[i] = 0;
    }
}

VOID
HalpInitOtherBuses (
    VOID
    )
{
    // no other buses
}


NTSTATUS
HalpGetMcaLog (
    OUT PMCA_EXCEPTION  Exception,
    OUT PULONG          ReturnedLength
    )
{
    return STATUS_NOT_SUPPORTED;
}

NTSTATUS
HalpMcaRegisterDriver(
    IN PMCA_DRIVER_INFO DriverInfo
    )
{
    return STATUS_NOT_SUPPORTED;
}


ULONG
FASTCALL
HalSystemVectorDispatchEntry (
    IN ULONG Vector,
    OUT PKINTERRUPT_ROUTINE **FlatDispatch,
    OUT PKINTERRUPT_ROUTINE *NoConnection
    )
{
    return FALSE;
}