mproc.c File Reference

#include <ntoskrnl.h>
#include <debug.h>

Include dependency graph for mproc.c:

Go to the source code of this file.

Classes
struct	_APINFO
struct	_AP_SETUP_STACK

Macros
#define	NDEBUG

Typedefs
typedef struct _APINFO	APINFO
typedef struct _APINFO *	PAPINFO
typedef struct _AP_SETUP_STACK	AP_SETUP_STACK
typedef struct _AP_SETUP_STACK *	PAP_SETUP_STACK

Functions
VOID NTAPI	KeStartAllProcessors (VOID)

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 12 of file mproc.c.

Typedef Documentation

AP_SETUP_STACK

typedef struct _AP_SETUP_STACK AP_SETUP_STACK

APINFO

typedef struct _APINFO APINFO

PAP_SETUP_STACK

typedef struct _AP_SETUP_STACK * PAP_SETUP_STACK

PAPINFO

typedef struct _APINFO * PAPINFO

Function Documentation

KeStartAllProcessors()

VOID NTAPI KeStartAllProcessors

(

VOID

)

Definition at line 38 of file mproc.c.

{
    PVOID KernelStack, DPCStack;
    ULONG ProcessorCount = 0;
    PAPINFO APInfo;
 
    while (TRUE)
    {
        ProcessorCount++;
        KernelStack = NULL;
        DPCStack = NULL;
 
        // Allocate structures for a new CPU.
        APInfo = ExAllocatePoolZero(NonPagedPool, sizeof(*APInfo), TAG_KERNEL);
        if (!APInfo)
            break;
        ASSERT(ALIGN_DOWN_POINTER_BY(APInfo, PAGE_SIZE) == APInfo);
 
        KernelStack = MmCreateKernelStack(FALSE, 0);
        if (!KernelStack)
            break;
 
        DPCStack = MmCreateKernelStack(FALSE, 0);
        if (!DPCStack)
            break;
 
        // Initalize a new PCR for the specific AP
        KiInitializePcr(ProcessorCount,
                        &APInfo->Pcr,
                        &APInfo->Idt[0],
                        &APInfo->Gdt[0],
                        &APInfo->Tss,
                        (PKTHREAD)&APInfo->Thread,
                        DPCStack);
 
        // Prepare descriptor tables
        KDESCRIPTOR bspGdt, bspIdt;
        __sgdt(&bspGdt.Limit);
        __sidt(&bspIdt.Limit);
        RtlCopyMemory(&APInfo->Gdt, (PVOID)bspGdt.Base, bspGdt.Limit + 1);
        RtlCopyMemory(&APInfo->Idt, (PVOID)bspIdt.Base, bspIdt.Limit + 1);
 
        KiSetGdtDescriptorBase(KiGetGdtEntry(&APInfo->Gdt, KGDT_R0_PCR), (ULONG_PTR)&APInfo->Pcr);
        KiSetGdtDescriptorBase(KiGetGdtEntry(&APInfo->Gdt, KGDT_DF_TSS), (ULONG_PTR)&APInfo->TssDoubleFault);
        KiSetGdtDescriptorBase(KiGetGdtEntry(&APInfo->Gdt, KGDT_NMI_TSS), (ULONG_PTR)&APInfo->TssNMI);
 
        KiSetGdtDescriptorBase(KiGetGdtEntry(&APInfo->Gdt, KGDT_TSS), (ULONG_PTR)&APInfo->Tss);
        // Clear TSS Busy flag (aka set the type to "TSS (Available)")
        KiGetGdtEntry(&APInfo->Gdt, KGDT_TSS)->HighWord.Bits.Type = I386_TSS;
 
        APInfo->TssDoubleFault.Esp0 = (ULONG_PTR)&APInfo->NMIStackData;
        APInfo->TssDoubleFault.Esp = (ULONG_PTR)&APInfo->NMIStackData;
 
        APInfo->TssNMI.Esp0 = (ULONG_PTR)&APInfo->NMIStackData;
        APInfo->TssNMI.Esp = (ULONG_PTR)&APInfo->NMIStackData;
 
        // Fill the processor state
        PKPROCESSOR_STATE ProcessorState = &APInfo->Pcr.Prcb->ProcessorState;
        RtlZeroMemory(ProcessorState, sizeof(*ProcessorState));
 
        ProcessorState->SpecialRegisters.Cr0 = __readcr0();
        ProcessorState->SpecialRegisters.Cr3 = __readcr3();
        ProcessorState->SpecialRegisters.Cr4 = __readcr4();
 
        ProcessorState->ContextFrame.SegCs = KGDT_R0_CODE;
        ProcessorState->ContextFrame.SegDs = KGDT_R3_DATA;
        ProcessorState->ContextFrame.SegEs = KGDT_R3_DATA;
        ProcessorState->ContextFrame.SegSs = KGDT_R0_DATA;
        ProcessorState->ContextFrame.SegFs = KGDT_R0_PCR;
 
        ProcessorState->SpecialRegisters.Gdtr.Base = (ULONG_PTR)APInfo->Gdt;
        ProcessorState->SpecialRegisters.Gdtr.Limit = sizeof(APInfo->Gdt) - 1;
        ProcessorState->SpecialRegisters.Idtr.Base = (ULONG_PTR)APInfo->Idt;
        ProcessorState->SpecialRegisters.Idtr.Limit = sizeof(APInfo->Idt) - 1;
 
        ProcessorState->SpecialRegisters.Tr = KGDT_TSS;
 
        ProcessorState->ContextFrame.Esp = (ULONG_PTR)KernelStack;
        ProcessorState->ContextFrame.Eip = (ULONG_PTR)KiSystemStartup;
        ProcessorState->ContextFrame.EFlags = __readeflags() & ~EFLAGS_INTERRUPT_MASK;
 
        ProcessorState->ContextFrame.Esp = (ULONG)((ULONG_PTR)ProcessorState->ContextFrame.Esp - sizeof(AP_SETUP_STACK));
        PAP_SETUP_STACK ApStack = (PAP_SETUP_STACK)ProcessorState->ContextFrame.Esp;
        ApStack->KxLoaderBlock = KeLoaderBlock;
        ApStack->ReturnAddr = NULL;
 
        // Update the LOADER_PARAMETER_BLOCK structure for the new processor
        KeLoaderBlock->KernelStack = (ULONG_PTR)KernelStack;
        KeLoaderBlock->Prcb = (ULONG_PTR)&APInfo->Pcr.Prcb;
        KeLoaderBlock->Thread = (ULONG_PTR)&APInfo->Pcr.Prcb->IdleThread;
 
        // Start the CPU
        DPRINT("Attempting to Start a CPU with number: %lu\n", ProcessorCount);
        if (!HalStartNextProcessor(KeLoaderBlock, ProcessorState))
        {
            break;
        }
 
        // And wait for it to start
        while (KeLoaderBlock->Prcb != 0)
        {
            //TODO: Add a time out so we don't wait forever
            KeMemoryBarrier();
            YieldProcessor();
        }
    }
 
    // The last CPU didn't start - clean the data
    ProcessorCount--;
 
    if (APInfo)
        ExFreePoolWithTag(APInfo, TAG_KERNEL);
    if (KernelStack)
        MmDeleteKernelStack(KernelStack, FALSE);
    if (DPCStack)
        MmDeleteKernelStack(DPCStack, FALSE);
 
    DPRINT1("KeStartAllProcessors: Successful AP startup count is %lu\n", ProcessorCount);
}

Referenced by Phase1InitializationDiscard().