Bochs 模拟器 -> 从软盘闪烁启动？

Question

我有一个问题与我的Bochs模拟器/汇编代码，这里是问题:

00060739512i[BIOS  ] Booting from 0000:7c00
00061082284e[CPU0  ] load_seg_reg(SS): not writable data segment
00061082284e[CPU0  ] interrupt(): gate descriptor is not valid sys seg (vector=0x0d)
00061082284e[CPU0  ] interrupt(): gate descriptor is not valid sys seg (vector=0x08)
00061082284i[CPU0  ] CPU is in protected mode (active)
00061082284i[CPU0  ] CS.mode = 32 bit
00061082284i[CPU0  ] SS.mode = 16 bit
00061082284i[CPU0  ] EFER   = 0x00000000
00061082284i[CPU0  ] | EAX=60000008  EBX=00007e00  ECX=00090002  EDX=00000000
00061082284i[CPU0  ] | ESP=00007c00  EBP=00007c00  ESI=000e0000  EDI=0000ffac
00061082284i[CPU0  ] | IOPL=0 id vip vif ac vm RF nt of df if tf sf zf af PF cf
00061082284i[CPU0  ] | SEG sltr(index|ti|rpl)     base    limit G D
00061082284i[CPU0  ] |  CS:0008( 0001| 0|  0) 00000000 ffffffff 1 1
00061082284i[CPU0  ] |  DS:0008( 0001| 0|  0) 00000000 ffffffff 1 1
00061082284i[CPU0  ] |  SS:0000( 0005| 0|  0) 00000000 0000ffff 0 0
00061082284i[CPU0  ] |  ES:0000( 0005| 0|  0) 00000000 0000ffff 0 0
00061082284i[CPU0  ] |  FS:0000( 0005| 0|  0) 00000000 0000ffff 0 0
00061082284i[CPU0  ] |  GS:0000( 0005| 0|  0) 00000000 0000ffff 0 0
00061082284i[CPU0  ] | EIP=00007e56 (00007e56)
00061082284i[CPU0  ] | CR0=0x60000011 CR2=0x00000000
00061082284i[CPU0  ] | CR3=0x00000000 CR4=0x00000000
00061082284i[CPU0  ] 0x0000000000007e56>> mov ss, ax : 8ED0
00061082284e[CPU0  ] exception(): 3rd (13) exception with no resolution, shutdown status is 00h, resetting

gdt.asm

gdt_start:
dd 0
dd 0
gdt_codedesc:
dw 0xFFFF       ; Limit
dw 0x0000       ; Base (low)
db 0x00         ; Base (medium)
db 10011010b    ; Flags
db 11001111b    ; Flags + Upper Limit
db 0x00         ; Base (high)
gdt_datadesc:
dw 0xFFFF
dw 0x0000
db 0x00
db 10010010b
db 11001111b
db 0x00
gdt_end;
gdt_descriptor:
gdt_size:
dw gdt_end - gdt_start - 1
dd gdt_start
codeseg equ gdt_codedesc - gdt_start
dataseg equ gdt_codedesc - gdt_start

ExtendedProgram。asm(这是主要的"类"(我是java开发人员:))，所有的事情都发生在它身上，它也控制着gdt。Asm:))

[org 0x7e00]
jmp EnterProtectedMode
%include "gdt.asm"
%include "print.asm"
EnterProtectedMode:
call EnableA20
cli
lgdt [gdt_descriptor]
mov eax, cr0
or eax, 1
mov cr0, eax
jmp codeseg:StartProtectedMode
EnableA20:
in al, 0x92
or al, 2
out 0x92, al
ret

[bits 32]
StartProtectedMode:

mov ax, dataseg
mov ds, ax
mov ss, ax
mov es, ax
mov fs, ax
mov gs, ax
mov ebp, 0x90000
mov esp, ebp
mov[0xb8000], byte 'h'
jmp $
times 2048-($-$$) db 0

有人知道如何解决这个问题吗?我遵循这个教程:https://www.youtube.com/watch?v=pXzortxPZR8&list=PLxN4E629pPnKKqYsNVXpmCza8l0Jb6l8-&index=4谢谢任何帮助!

Answer 1

codeseg equ gdt_codedesc - gdt_start数据方程gdt_ ->codedesc必须为datadesc - gdt_start