haribote/asmhead.lst

   1      1                                  ; haribote-os boot asm
   2      2                                  ; TAB=4
   3      3
   4      4
   5      5                                  VBEMODE EQU 0x118                       ; 1024 x 768 x 24bitカラー
   6      6                                  BITPERPIXEL EQU 24
   7      7                                  MEMORYMODEL EQU 6 ; 4ならインデックスカラー　6ならダイレクトカラー
   8      8                                  ; （画面モード一覧）
   9      9                                  ;       0x100 :  640 x  400 x 8bitカラー
  10     10                                  ;       0x101 :  640 x  480 x 8bitカラー
  11     11                                  ;       0x103 :  800 x  600 x 8bitカラー
  12     12                                  ;       0x105 : 1024 x  768 x 8bitカラー
  13     13                                  ;       0x107 : 1280 x 1024 x 8bitカラー
  14     14                                  ;       0x118 : 1024 x 768 x 24bitカラー
  15     15
  16     16
  17     17                                  BOOTPACK_CODE EQU 0x00280000            ; bootpackのロード先
  18     18
  19     19                                  ;DSKCAC EQU             0x00100000              ; ディスクキャッシュの場所
  20     20                                  ;DSKCAC0        EQU             0x00008000              ; ディスクキャッシュの場所（リアルモード）
  21     21
  22     22                                  SYSPAGEDIR EQU 0x00100000
  23     23
  24     24                                  ; BOOT_INFO関係
  25     25                                  BOOTDRIVE       EQU             0x0ff0                  ; ブートセクタが設定する
  26     26                                  LEDS    EQU             0x0ff1
  27     27                                  VMODE   EQU             0x0ff2                  ; 色数に関する情報。何ビットカラーか？
  28     28                                  SCRNX   EQU             0x0ff4                  ; 解像度のX
  29     29                                  SCRNY   EQU             0x0ff6                  ; 解像度のY
  30     30                                  VRAM    EQU             0x0ff8                  ; グラフィックバッファの開始番地
  31     31
  32     32                                                  ORG             0xc200                  ; このプログラムがどこに読み込まれるのか
  33     33
  34     34                                  ;ブートデバイスを保存
  35     35 00000000 8816F00F                                mov [BOOTDRIVE], dl
  36     36                                  ; VBE存在確認
  37     37
  38     38 00000004 B80090                                  MOV             AX,0x9000
  39     39 00000007 8EC0                                    MOV             ES,AX
  40     40 00000009 BF0000                                  MOV             DI,0
  41     41 0000000C B8004F                                  MOV             AX,0x4f00
  42     42 0000000F CD10                                    INT             0x10
  43     43 00000011 3D4F00                                  CMP             AX,0x004f
  44     44 00000014 7553                                    JNE             scrn320
  45     45
  46     46                                  ; VBEのバージョンチェック
  47     47
  48     48 00000016 268B4504                                MOV             AX,[ES:DI+4]
  49     49 0000001A 3D0002                                  CMP             AX,0x0200
  50     50 0000001D 724A                                    JB              scrn320                 ; if (AX < 0x0200) goto scrn320
  51     51
  52     52                                  ; 画面モード情報を得る
  53     53
  54     54 0000001F B91801                                  MOV             CX,VBEMODE
  55     55 00000022 B8014F                                  MOV             AX,0x4f01
  56     56 00000025 CD10                                    INT             0x10
  57     57 00000027 3D4F00                                  CMP             AX,0x004f
  58     58 0000002A 753D                                    JNE             scrn320
  59     59
  60     60                                  ; 画面モード情報の確認
  61     61
  62     62 0000002C 26807D1918                              CMP             BYTE [ES:DI+0x19],BITPERPIXEL
  63     63 00000031 7536                                    JNE             scrn320
  64     64 00000033 26807D1B06                              CMP             BYTE [ES:DI+0x1b],MEMORYMODEL
  65     65 00000038 752F                                    JNE             scrn320
  66     66 0000003A 268B05                                  MOV             AX,[ES:DI+0x00]
  67     67 0000003D 258000                                  AND             AX,0x0080
  68     68 00000040 7427                                    JZ              scrn320                 ; モード属性のbit7が0だったのであきらめる
  69     69
  70     70                                  ; 画面モードの切り替え
  71     71
  72     72 00000042 BB1841                                  MOV             BX,VBEMODE | 0x4000
  73     73 00000045 B8024F                                  MOV             AX,0x4f02
  74     74 00000048 CD10                                    INT             0x10
  75     75 0000004A C606F20F18                              MOV             BYTE [VMODE],BITPERPIXEL        ; 画面モードをメモする（C言語が参照する）
  76     76 0000004F 268B4512                                MOV             AX,[ES:DI+0x12]
  77     77 00000053 A3F40F                                  MOV             [SCRNX],AX
  78     78 00000056 268B4514                                MOV             AX,[ES:DI+0x14]
  79     79 0000005A A3F60F                                  MOV             [SCRNY],AX
  80     80 0000005D 26668B4528                              MOV             EAX,[ES:DI+0x28]
  81     81 00000062 66A3F80F                                MOV             [VRAM],EAX
  82     82 00000066 E92000                                  JMP             keystatus
  83     83
  84     84                                  scrn320:
  85     85 00000069 B013                                    MOV             AL,0x13                 ; VGAグラフィックス、320x200x8bitカラー
  86     86 0000006B B400                                    MOV             AH,0x00
  87     87 0000006D CD10                                    INT             0x10
  88     88 0000006F C606F20F08                              MOV             BYTE [VMODE],8  ; 画面モードをメモする（C言語が参照する）
  89     89 00000074 C706F40F4001                            MOV             WORD [SCRNX],320
  90     90 0000007A C706F60FC800                            MOV             WORD [SCRNY],200
  91     91 00000080 66C706F80F00000A00                      MOV             DWORD [VRAM],0x000a0000
  92     92
  93     93                                  ; キーボードのLED状態をBIOSに教えてもらう
  94     94
  95     95                                  keystatus:
  96     96 00000089 B402                                    MOV             AH,0x02
  97     97 0000008B CD16                                    INT             0x16                    ; keyboard BIOS
  98     98 0000008D A2F10F                                  MOV             [LEDS],AL
  99     99
 100    100                                  ; PICが一切の割り込みを受け付けないようにする
 101    101                                  ;       AT互換機の仕様では、PICの初期化をするなら、
 102    102                                  ;       こいつをCLI前にやっておかないと、たまにハングアップする
 103    103                                  ;       PICの初期化はあとでやる
 104    104
 105    105 00000090 B0FF                                    MOV             AL,0xff
 106    106 00000092 E621                                    OUT             0x21,AL
 107    107 00000094 90                                      NOP                                             ; OUT命令を連続させるとうまくいかない機種があるらしいので
 108    108 00000095 E6A1                                    OUT             0xa1,AL
 109    109
 110    110 00000097 FA                                      CLI                                             ; さらにCPUレベルでも割り込み禁止
 111    111
 112    112                                  ; CPUから1MB以上のメモリにアクセスできるように、A20GATEを設定
 113    113
 114    114 00000098 E8F600                                  CALL    waitkbdout
 115    115 0000009B B0D1                                    MOV             AL,0xd1
 116    116 0000009D E664                                    OUT             0x64,AL
 117    117 0000009F E8EF00                                  CALL    waitkbdout
 118    118 000000A2 B0DF                                    MOV             AL,0xdf                 ; enable A20
 119    119 000000A4 E660                                    OUT             0x60,AL
 120    120 000000A6 E8E800                                  CALL    waitkbdout
 121    121
 122    122                                  ;[INSTRSET "i486p"]                             ; 486の命令まで使いたいという記述
 123    123
 124    124                                  ; プロテクトモード移行
 125    125                                  ; page size = 4mb or 4kb (混在)  pys addr size = 32 bit
 126    126
 127    127 000000A9 0F0116[DA01]                            LGDT    [GDTR0]                 ; 暫定GDTを設定
 128    128 000000AE 0F20C0                                  MOV             EAX,CR0
 129    129                                                  ;or eax, 1 << 0x1f ; paging flag
 130    130                                                  ;AND            EAX,0x7fffffff  ; bit31を0にする（ページング禁止のため）
 131    131 000000B1 660D01000000                            OR              EAX,0x00000001  ; bit0を1にする（プロテクトモード移行のため）
 132    132 000000B7 0F22C0                                  MOV             CR0,EAX
 133    133 000000BA E90000                                  JMP     pipelineflush
 134    134                                  pipelineflush:
 135    135                                  ;ページディレクトリ等の設定
 136    136
 137    137 000000BD 6631C0                                  xor eax, eax
 138    138 000000C0 66B900000000                            mov ecx, 0
 139    139
 140    140 000000C6 90<rept>                                align 16
 141    141                                  pagedirloop:
 142    142 000000D0 6689C8                                  mov eax, ecx
 143    143 000000D3 66C1E016                                shl eax, 22
 144    144 000000D7 660D83010000                            or eax, ((1 << 8)|(1 << 7)|(1 << 1)|1)
 145    145 000000DD 676689048D00001000                      mov [SYSPAGEDIR + 4 * ecx], eax
 146    146
 147    147 000000E6 6641                                    inc ecx
 148    148 000000E8 6681F900040000                          cmp ecx, 0x400
 149    149 000000EF 72DF                                    jb pagedirloop
 150    150
 151    151
 152    152                                  ;ページングの設定
 153    153 000000F1 0F20D8                                  mov eax, cr3
 154    154 000000F4 660D00001000                            or eax, SYSPAGEDIR
 155    155 000000FA 0F22D8                                  mov cr3, eax
 156    156
 157    157 000000FD 0F20E0                                  mov eax, cr4
 158    158 00000100 6625DFFFFFFF                            and eax, ~(1 << 5) ;  physical addr ext(pae) を無効に
 159    159 00000106 660D10000000                            or eax, 1 << 4; enable paging size ext(pse)
 160    160 0000010C 0F22E0                                  mov cr4, eax
 161    161
 162    162                                                  ;TLB無効化?
 163    163 0000010F 0F20D8                                  mov eax, cr3
 164    164 00000112 0F22D8                                  mov cr3, eax
 165    165
 166    166 00000115 0F20C0                                  MOV             EAX,CR0
 167    167 00000118 660D00000080                            or eax, 1 << 0x1f ; paging flag
 168    168 0000011E 0F22C0                                  MOV             CR0,EAX
 169    169 00000121 E90000                                  JMP     pipelineflush2
 170    170                                  pipelineflush2:
 171    171
 172    172 00000124 B80800                                  MOV             AX,1*8                  ;  読み書き可能セグメント32bit
 173    173 00000127 8ED8                                    MOV             DS,AX
 174    174 00000129 8EC0                                    MOV             ES,AX
 175    175 0000012B 8EE0                                    MOV             FS,AX
 176    176 0000012D 8EE8                                    MOV             GS,AX
 177    177 0000012F 8ED0                                    MOV             SS,AX
 178    178
 179    179
 180    180                                  ; ついでにディスクデータも本来の位置へ転送
 181    181
 182    182                                  ; まずはブートセクタから
 183    183
 184    184                                                  ;MOV            ESI,0x7c00              ; 転送元
 185    185                                                  ;MOV            EDI,DSKCAC              ; 転送先
 186    186                                                  ;MOV            ECX,512/4
 187    187                                                  ;CALL   memcpy
 188    188
 189    189                                  ; asmheadでしなければいけないことは全部し終わったので、
 190    190                                  ;       あとはbootpackに任せる
 191    191
 192    192                                  ; bootpackの起動
 193    193
 194    194 00000131 66BB[E0010000]                          MOV     EBX, bootpack
 195    195 00000137 67668B4B3C                              MOV     ECX, [EBX+0x3C]   ; lfanew
 196    196 0000013C 6601CB                                  add ebx, ecx          ; nt header 32
 197    197 0000013F 678B4306                                mov  ax, [ebx + 6]    ; number of section
 198    198 00000143 67668B6B28                              mov ebp, [ebx + 0x28] ; entry point
 199    199 00000148 6681C500002800                          add ebp, BOOTPACK_CODE
 200    200 0000014F 6681C3F8000000                          add ebx, 0xf8          ; section header
 201    201                                  readsection:
 202    202 00000156 67668B7B0C                              mov edi, [ebx + 0x0C] ; virtual addr
 203    203 0000015B 67668B4B10                              mov ecx, [ebx + 0x10] ; size of raw data
 204    204 00000160 67668B7314                              mov esi, [ebx + 0x14] ; pointer to raw data
 205    205 00000165 6681C700002800                          add edi, BOOTPACK_CODE ; このセクションのコピー先
 206    206 0000016C 6681C6[E0010000]                        add esi, bootpack      ; コピー元
 207    207 00000173 FC                                      cld
 208    208
 209    209 00000174 F367A4                                  a32 rep movsb
 210    210                                                  ;db 0xf3
 211    211                                                  ;db 0x67
 212    212                                                  ;db 0xa4
 213    213                                                  ;rep dword movsb ; f3 a4
 214    214
 215    215
 216    216 00000177 6681C328000000                          add ebx, 0x28 ; section header size
 217    217 0000017E 48                                      dec ax
 218    218 0000017F 75D5                                    jnz readsection
 219    219
 220    220
 221    221 00000181 66BC00003800                            MOV     ESP, 0x00380000 ; スタック初期値
 222    222
 223    223 00000187 666810000000                            push dword 2*8
 224    224 0000018D 6655                                    push ebp
 225    225
 226    226                                                  ;sti
 227    227
 228    228
 229    229 0000018F 66CB                                    o32 retf
 230    230                                                  ; call eipload
 231    231                                  ; eipload:
 232    232                                                  ; pop ax
 233    233                                                  ; movzx eax, ax
 234    234                                                  ; mov [eax+0x15], ebp
 235    235                                                  ; mov dword [eax+0x19], 2*8
 236    236
 237    237                                                  ; jmp dword 0:0
 238    238                                                  ; db 0,0
 239    239
 240    240                                  waitkbdout:
 241    241 00000191 E464                                    IN               AL,0x64
 242    242 00000193 2402                                    AND              AL,0x02
 243    243 00000195 E460                                    IN               AL,0x60                ; から読み(受信バッファが悪さをしないように)
 244    244 00000197 75F8                                    JNZ             waitkbdout              ; ANDの結果が0でなければwaitkbdoutへ
 245    245 00000199 C3                                      RET
 246    246
 247    247                                  memcpy:
 248    248 0000019A 6650                                    push eax
 249    249                                  memcpy_loop:
 250    250 0000019C 67668B06                                MOV             EAX,[ESI]
 251    251 000001A0 6681C604000000                          ADD             ESI,4
 252    252 000001A7 67668907                                MOV             [EDI],EAX
 253    253 000001AB 6681C704000000                          ADD             EDI,4
 254    254 000001B2 6681E901000000                          SUB             ECX,1
 255    255 000001B9 75E1                                    JNZ             memcpy_loop                     ; 引き算した結果が0でなければmemcpyへ
 256    256 000001BB 6658                                    pop eax
 257    257 000001BD C3                                      RET
 258    258                                  ; memcpyはアドレスサイズプリフィクスを入れ忘れなければ、ストリング命令でも書ける
 259    259
 260    260
 261    261 000001BE <res 00000002>                          ALIGNB  16
 262    262          ******************       warning: uninitialized space declared in .text section: zeroing
 263    263                                  GDT0:
 264    264 000001C0 <res 00000008>                          RESB    8                               ; ヌルセレクタ
 265    265          ******************       warning: uninitialized space declared in .text section: zeroing
 266    266 000001C8 FFFF00000092CF00                        db 0xff,0xff,0x00,0x00,0x00,0x92,0xcf,0x00      ; 読み書き可能セグメント32bit
 267    267                                                  ;db 0xff,0xff,0x00,0x00,0x28,0x9a,0x4f,0x00     ; 実行可能セグメント32bit（bootpack用）
 268    268 000001D0 FFFF0000009ACF00                        db 0xff,0xff,0x00,0x00,0x00,0x9a,0xcf,0x00      ; 実行可能セグメント32bit（bootpack用）
 269    269
 270    270 000001D8 0000                                    DW              0
 271    271                                  GDTR0:
 272    272 000001DA 1700                                    DW              8*3-1
 273    273 000001DC [C0010000]                              DD              GDT0
 274    274
 275    275                                                  ALIGNB  16
 276    276                                  bootpack: