Question

我目前正在开发一个操作系统。我使用VMWare来模拟它。我在每一行使用int 0x16进行调试，我发现当我将保护模式切换CR0切换为1时，它只是三次故障。这是内核加载器的第2阶段：

bits    16
org 0x500
jmp main
%include "stdio.inc"        
%include "Gdt.inc"          
%include "A20.inc"
%include "Fat12.inc"
%include "common.inc"
LoadingMsg db "Please Wait . . .", 0x0D, 0x0A, 0x00
msgFailure db 0x0D, 0x0A, "Can't find Krnl. Press any key to retry", 0x0D, 0x0A, 0x0A, 0x00
main:
    cli         
    xor ax, ax  
    mov ds, ax
    mov es, ax
    mov ax, 0x9000
    mov ss, ax
    mov sp, 0xFFFF
    sti         
    call    InstallGDT      
    call    EnableA20_KKbrd_Out
    mov si, LoadingMsg
    call    Puts16 ; nuts61
    jmp    EnterKernel
    mov ah, 0
    int     0x16    
    int     0x19    
    cli             
    hlt
EnterKernel:
    cli 
    mov eax, cr0
    or eax, 1
    mov cr0, eax ; <= here is the damn triple fault
    jmp CODE_DESC:KernelC
bits 32
KernelC:
    mov     ax, DATA_DESC
    mov     ds, ax
    mov     ss, ax
    mov     es, ax
    mov     esp, 90000h
CopyImage:
    mov eax, dword [ImageSize]
    movzx   ebx, word [bpbBytesPerSector]
    mul ebx
    mov ebx, 4
    div ebx
    cld
    mov    esi, IMAGE_RMODE_BASE
    mov edi, IMAGE_PMODE_BASE
    mov ecx, eax
    rep movsd
jmp CODE_DESC:IMAGE_PMODE_BASE
cli
hlt

我标记了错误位置。我还发现了一些VMWare三重故障日志：

2016-01-14T17:30:00.613+01:00| vcpu-0| I120: Triple fault.
2016-01-14T17:30:00.613+01:00| vcpu-0| I120: MsgHint: msg.monitorEvent.tripleFault
2016-01-14T17:30:00.613+01:00| vcpu-0| I120+ A fault has occurred causing a virtual CPU to enter the shutdown state. If this fault had occurred outside of a virtual machine, it would have caused the physical machine to restart. The shutdown state can be reached by incorrectly configuring the virtual machine, a bug in the guest operating system, or a problem in VMware Player.

我该如何解决这个问题？有什么建议吗？

更改CR0以启动保护模式时出现三重故障

0 个答案: