调试bootsect和setup和head到main

<bochs:1> b 0x0:0x7c00

<bochs:2> c

(0) Breakpoint 1, 0x7c00 in ?? ()

Next at t=16165613

(0) [0x00007c00] 0000:7c00 (unk. ctxt): mov ax, 0x7c0             ; b8c007

<bochs:3> b 0x90200

<bochs:4> c

(0) Breakpoint 2, 0x90200 in ?? ()

Next at t=16396177

(0) [0x00090200] 9020:0000 (unk. ctxt): mov ax, 0x9000            ; b80090

<bochs:5> b 0x00

<bochs:6> c

(0) Breakpoint 3, 0x0 in ?? ()

Next at t=16659024

(0) [0x00000000] 0008:00000000 (unk. ctxt): mov eax, 0x10             ; b810000000

<bochs:7> u

00000000: (                    ): mov eax, 0x10             ; b810000000

<bochs:8> b 0x5400

<bochs:9> c

(0) Breakpoint 4, 0x5400 in ?? ()

Next at t=16660345

(0) [0x00005400] 0008:00005400 (unk. ctxt): push 0x0                  ; 6a00

<bochs:12> u /10

00005400: (                    ): push 0x0                  ; 6a00

00005402: (                    ): push 0x0                  ; 6a00

00005404: (                    ): push 0x0                  ; 6a00

00005406: (                    ): push 0x5412               ; 6812540000

0000540b: (                    ): push 0x664c               ; 684c660000

00005410: (                    ): jmp 0x5450                ; eb3e

00005412: (                    ): jmp 0x5412                ; ebfe

00005414: (                    ): push ebp                  ; 55

00005415: (                    ): outsb dx, byte ptr [esi]  ; 6e

00005416: (                    ): imul ebp, dword ptr ds:[esi+0x6f], 0x77 ; 6b6e6f77

<bochs:13> b 0x5450

<bochs:14> c

(0) Breakpoint 5, 0x5450 in ?? ()

Next at t=16660351

(0) [0x00005450] 0008:00005450 (unk. ctxt): mov ecx, 0x1400           ; b900140000

<bochs:17> u /30

00005450: (                    ): mov ecx, 0x1400           ; b900140000

00005455: (                    ): xor eax, eax              ; 31c0

00005457: (                    ): xor edi, edi              ; 31ff

00005459: (                    ): cld                       ; fc

0000545a: (                    ): rep stos dword ptr [edi], eax ; f3ab

0000545c: (                    ): mov dword ptr [ds:0x0], 0x1007 ; c7050000000007100000

00005466: (                    ): mov dword ptr [ds:0x4], 0x2007 ; c7050400000007200000

00005470: (                    ): mov dword ptr [ds:0x8], 0x3007 ; c7050800000007300000

0000547a: (                    ): mov dword ptr [ds:0xc], 0x4007 ; c7050c00000007400000

00005484: (                    ): mov edi, 0x4ffc           ; bffc4f0000

00005489: (                    ): mov eax, 0xfff007         ; b807f0ff00

0000548e: (                    ): std                       ; fd

0000548f: (                    ): stos dword ptr [edi], eax ; ab

00005490: (                    ): sub eax, 0x1000           ; 2d00100000

00005495: (                    ): jnl 0x548f                ; 7df8

00005497: (                    ): xor eax, eax              ; 31c0

00005499: (                    ): mov cr3, eax              ; 0f22d8

0000549c: (                    ): mov eax, cr0              ; 0f20c0

0000549f: (                    ): or eax, 0x80000000        ; 0d00000080

000054a4: (                    ): mov cr0, eax              ; 0f22c0

000054a7: (                    ): retn                      ; c3

000054a8: (                    ): add byte ptr ds:[eax], al ; 0000

000054aa: (                    ): inc dword ptr ds:[edi]    ; ff07

000054ac: (                    ): mov eax, 0x54             ; b854000000

000054b1: (                    ): add bh, bh                ; 00ff

000054b3: (                    ): pop es                    ; 07

000054b4: (                    ): mov eax, 0x2800005c       ; b85c000028

000054b9: (                    ): push esp                  ; 54

000054ba: (                    ): or byte ptr ds:[eax], al  ; 0800

000054bc: (                    ): add byte ptr ds:[esi+0x54280000], cl ; 008e00002854

<bochs:18> b 0x54a7

<bochs:19> c

(0) Breakpoint 6, 0x54a7 in ?? ()

Next at t=16677775

(0) [0x000054a7] 0008:000054a7 (unk. ctxt): retn                      ; c3

<bochs:20> s

Next at t=16677776

(0) [0x0000664c] 0008:0000664c (unk. ctxt): push ebp                  ; 55

<bochs:21> u /20

0000664c: (                    ): push ebp                  ; 55

0000664d: (                    ): mov ebp, esp              ; 89e5

0000664f: (                    ): movzx ecx, word ptr [ds:0x901fc] ; 0fb70dfc010900

00006656: (                    ): mov dword ptr [ds:0x1a964], ecx ; 890d64a90100

0000665c: (                    ): mov eax, 0x90080          ; b880000900

00006661: (                    ): mov edx, 0x1dd6c          ; ba6cdd0100

00006666: (                    ): mov ecx, dword ptr ds:[eax] ; 8b08

00006668: (                    ): mov dword ptr ds:[edx], ecx ; 890a

0000666a: (                    ): mov ecx, dword ptr ds:[eax+0x4] ; 8b4804

0000666d: (                    ): mov dword ptr ds:[edx+0x4], ecx ; 894a04

00006670: (                    ): mov ecx, dword ptr ds:[eax+0x8] ; 8b4808

00006673: (                    ): mov dword ptr ds:[edx+0x8], ecx ; 894a08

00006676: (                    ): mov ecx, dword ptr ds:[eax+0xc] ; 8b480c

00006679: (                    ): mov dword ptr ds:[edx+0xc], ecx ; 894a0c

0000667c: (                    ): mov ecx, dword ptr ds:[eax+0x10] ; 8b4810

0000667f: (                    ): mov dword ptr ds:[edx+0x10], ecx ; 894a10

00006682: (                    ): mov ecx, dword ptr ds:[eax+0x14] ; 8b4814

00006685: (                    ): mov dword ptr ds:[edx+0x14], ecx ; 894a14

00006688: (                    ): mov ecx, dword ptr ds:[eax+0x18] ; 8b4818

0000668b: (                    ): mov dword ptr ds:[edx+0x18], ecx ; 894a18

<bochs:22>