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2288 | clevermous | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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4273 | clevermous | 3 | ;; Copyright (C) KolibriOS team 2004-2013. All rights reserved. ;; |
2288 | clevermous | 4 | ;; Distributed under terms of the GNU General Public License ;; |
5 | ;; ;; |
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6 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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7 | |||
8 | $Revision: 4695 $ |
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9 | |||
10 | |||
11 | ;********************************************************** |
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3539 | clevermous | 12 | ; Непосредственная работа с контроллером гибкого диска |
2288 | clevermous | 13 | ;********************************************************** |
3539 | clevermous | 14 | ; Автор исходного текста Кулаков Владимир Геннадьевич. |
15 | ; Адаптация и доработка Mario79 |
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2288 | clevermous | 16 | |
3539 | clevermous | 17 | ;give_back_application_data: ; переслать приложению |
2288 | clevermous | 18 | ; mov edi,[TASK_BASE] |
19 | ; mov edi,[edi+TASKDATA.mem_start] |
||
20 | ; add edi,ecx |
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21 | give_back_application_data_1: |
||
22 | mov esi, FDD_BUFF;FDD_DataBuffer ;0x40000 |
||
4273 | clevermous | 23 | mov ecx, 128 |
2288 | clevermous | 24 | cld |
25 | rep movsd |
||
26 | ret |
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27 | |||
3539 | clevermous | 28 | ;take_data_from_application: ; взять из приложени |
2288 | clevermous | 29 | ; mov esi,[TASK_BASE] |
30 | ; mov esi,[esi+TASKDATA.mem_start] |
||
31 | ; add esi,ecx |
||
32 | take_data_from_application_1: |
||
33 | mov edi, FDD_BUFF;FDD_DataBuffer ;0x40000 |
||
4273 | clevermous | 34 | mov ecx, 128 |
2288 | clevermous | 35 | cld |
36 | rep movsd |
||
37 | ret |
||
38 | |||
3539 | clevermous | 39 | ; Коды завершения операции с контроллером (FDC_Status) |
40 | FDC_Normal equ 0 ;нормальное завершение |
||
41 | FDC_TimeOut equ 1 ;ошибка тайм-аута |
||
42 | FDC_DiskNotFound equ 2 ;в дисководе нет диска |
||
43 | FDC_TrackNotFound equ 3 ;дорожка не найдена |
||
44 | FDC_SectorNotFound equ 4 ;сектор не найден |
||
2288 | clevermous | 45 | |
3539 | clevermous | 46 | ; Максимальные значения координат сектора (заданные |
47 | ; значения соответствуют параметрам стандартного |
||
48 | ; трехдюймового гибкого диска объемом 1,44 Мб) |
||
2288 | clevermous | 49 | MAX_Track equ 79 |
50 | MAX_Head equ 1 |
||
51 | MAX_Sector equ 18 |
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52 | |||
53 | uglobal |
||
3539 | clevermous | 54 | ; Счетчик тиков таймера |
2288 | clevermous | 55 | TickCounter dd ? |
3539 | clevermous | 56 | ; Код завершения операции с контроллером НГМД |
2288 | clevermous | 57 | FDC_Status DB ? |
3539 | clevermous | 58 | ; Флаг прерывания от НГМД |
2288 | clevermous | 59 | FDD_IntFlag DB ? |
3539 | clevermous | 60 | ; Момент начала последней операции с НГМД |
2288 | clevermous | 61 | FDD_Time DD ? |
3539 | clevermous | 62 | ; Номер дисковода |
2288 | clevermous | 63 | FDD_Type db 0 |
3539 | clevermous | 64 | ; Координаты сектора |
2288 | clevermous | 65 | FDD_Track DB ? |
66 | FDD_Head DB ? |
||
67 | FDD_Sector DB ? |
||
68 | |||
3539 | clevermous | 69 | ; Блок результата операции |
2288 | clevermous | 70 | FDC_ST0 DB ? |
71 | FDC_ST1 DB ? |
||
72 | FDC_ST2 DB ? |
||
73 | FDC_C DB ? |
||
74 | FDC_H DB ? |
||
75 | FDC_R DB ? |
||
76 | FDC_N DB ? |
||
3539 | clevermous | 77 | ; Счетчик повторения операции чтени |
2288 | clevermous | 78 | ReadRepCounter DB ? |
3539 | clevermous | 79 | ; Счетчик повторения операции рекалибровки |
2288 | clevermous | 80 | RecalRepCounter DB ? |
81 | endg |
||
3539 | clevermous | 82 | ; Область памяти для хранения прочитанного сектора |
2288 | clevermous | 83 | ;FDD_DataBuffer: times 512 db 0 ;DB 512 DUP (?) |
84 | fdd_motor_status db 0 |
||
85 | timer_fdd_motor dd 0 |
||
86 | |||
87 | ;************************************* |
||
3539 | clevermous | 88 | ;* ИНИЦИАЛИЗАЦИЯ РЕЖИМА ПДП ДЛЯ НГМД * |
2288 | clevermous | 89 | ;************************************* |
90 | Init_FDC_DMA: |
||
91 | pushad |
||
92 | mov al, 0 |
||
93 | out 0x0c, al; reset the flip-flop to a known state. |
||
94 | mov al, 6 ; mask channel 2 so we can reprogram it. |
||
95 | out 0x0a, al |
||
96 | mov al, [dmamode]; 0x46 -> Read from floppy - 0x4A Write to floppy |
||
97 | out 0x0b, al |
||
98 | mov al, 0 |
||
99 | out 0x0c, al; reset the flip-flop to a known state. |
||
100 | mov eax, 0xD000 |
||
101 | out 0x04, al; set the channel 2 starting address to 0 |
||
102 | shr eax, 8 |
||
103 | out 0x04, al |
||
104 | shr eax, 8 |
||
105 | out 0x81, al |
||
106 | mov al, 0 |
||
107 | out 0x0c, al; reset flip-flop |
||
108 | mov al, 0xff;set count (actual size -1) |
||
109 | out 0x5, al |
||
110 | mov al, 0x1;[dmasize] ;(0x1ff = 511 / 0x23ff =9215) |
||
111 | out 0x5, al |
||
112 | mov al, 2 |
||
113 | out 0xa, al |
||
114 | popad |
||
115 | ret |
||
116 | |||
117 | ;*********************************** |
||
3539 | clevermous | 118 | ;* ЗАПИСАТЬ БАЙТ В ПОРТ ДАННЫХ FDC * |
119 | ;* Параметры: * |
||
120 | ;* AL - выводимый байт. * |
||
2288 | clevermous | 121 | ;*********************************** |
122 | FDCDataOutput: |
||
4273 | clevermous | 123 | ; DEBUGF 1,'K : FDCDataOutput(%x)',al |
2288 | clevermous | 124 | ; pusha |
125 | push eax ecx edx |
||
3539 | clevermous | 126 | mov AH, AL ;запомнить байт в AH |
127 | ; Сбросить переменную состояния контроллера |
||
2288 | clevermous | 128 | mov [FDC_Status], FDC_Normal |
3539 | clevermous | 129 | ; Проверить готовность контроллера к приему данных |
130 | mov DX, 3F4h ;(порт состояния FDC) |
||
131 | mov ecx, 0x10000 ;установить счетчик тайм-аута |
||
2288 | clevermous | 132 | @@TestRS: |
3539 | clevermous | 133 | in AL, DX ;прочитать регистр RS |
134 | and AL, 0C0h ;выделить разряды 6 и 7 |
||
135 | cmp AL, 80h ;проверить разряды 6 и 7 |
||
2288 | clevermous | 136 | je @@OutByteToFDC |
137 | loop @@TestRS |
||
3539 | clevermous | 138 | ; Ошибка тайм-аута |
4273 | clevermous | 139 | ; DEBUGF 1,' timeout\n' |
2288 | clevermous | 140 | mov [FDC_Status], FDC_TimeOut |
141 | jmp @@End_5 |
||
3539 | clevermous | 142 | ; Вывести байт в порт данных |
2288 | clevermous | 143 | @@OutByteToFDC: |
144 | inc DX |
||
145 | mov AL, AH |
||
146 | out DX, AL |
||
4273 | clevermous | 147 | ; DEBUGF 1,' ok\n' |
2288 | clevermous | 148 | @@End_5: |
149 | ; popa |
||
150 | pop edx ecx eax |
||
151 | ret |
||
152 | |||
153 | ;****************************************** |
||
3539 | clevermous | 154 | ;* ПРОЧИТАТЬ БАЙТ ИЗ ПОРТА ДАННЫХ FDC * |
155 | ;* Процедура не имеет входных параметров. * |
||
156 | ;* Выходные данные: * |
||
157 | ;* AL - считанный байт. * |
||
2288 | clevermous | 158 | ;****************************************** |
159 | FDCDataInput: |
||
160 | push ECX |
||
161 | push DX |
||
3539 | clevermous | 162 | ; Сбросить переменную состояния контроллера |
2288 | clevermous | 163 | mov [FDC_Status], FDC_Normal |
3539 | clevermous | 164 | ; Проверить готовность контроллера к передаче данных |
165 | mov DX, 3F4h ;(порт состояния FDC) |
||
4115 | mario79 | 166 | mov ecx, 0x10000 ;установить счетчик тайм-аута |
2288 | clevermous | 167 | @@TestRS_1: |
3539 | clevermous | 168 | in AL, DX ;прочитать регистр RS |
169 | and AL, 0C0h ;выдлить разряды 6 и 7 |
||
170 | cmp AL, 0C0h ;проверить разряды 6 и 7 |
||
2288 | clevermous | 171 | je @@GetByteFromFDC |
172 | loop @@TestRS_1 |
||
3539 | clevermous | 173 | ; Ошибка тайм-аута |
4273 | clevermous | 174 | ; DEBUGF 1,'K : FDCDataInput: timeout\n' |
2288 | clevermous | 175 | mov [FDC_Status], FDC_TimeOut |
176 | jmp @@End_6 |
||
3539 | clevermous | 177 | ; Ввести байт из порта данных |
2288 | clevermous | 178 | @@GetByteFromFDC: |
179 | inc DX |
||
180 | in AL, DX |
||
4273 | clevermous | 181 | ; DEBUGF 1,'K : FDCDataInput: %x\n',al |
2288 | clevermous | 182 | @@End_6: |
183 | pop DX |
||
184 | pop ECX |
||
185 | ret |
||
186 | |||
187 | ;********************************************* |
||
3539 | clevermous | 188 | ;* ОБРАБОТЧИК ПРЕРЫВАНИЯ ОТ КОНТРОЛЛЕРА НГМД * |
2288 | clevermous | 189 | ;********************************************* |
190 | FDCInterrupt: |
||
4273 | clevermous | 191 | ; dbgstr 'FDCInterrupt' |
3771 | mario79 | 192 | ; Установить флаг прерывания |
2288 | clevermous | 193 | mov [FDD_IntFlag], 1 |
3771 | mario79 | 194 | mov al, 1 |
2288 | clevermous | 195 | ret |
196 | |||
197 | ;******************************************* |
||
3539 | clevermous | 198 | ;* ОЖИДАНИЕ ПРЕРЫВАНИЯ ОТ КОНТРОЛЛЕРА НГМД * |
2288 | clevermous | 199 | ;******************************************* |
200 | WaitFDCInterrupt: |
||
201 | pusha |
||
3539 | clevermous | 202 | ; Сбросить байт состояния операции |
2288 | clevermous | 203 | mov [FDC_Status], FDC_Normal |
3539 | clevermous | 204 | ; Обнулить счетчик тиков |
2288 | clevermous | 205 | mov eax, [timer_ticks] |
206 | mov [TickCounter], eax |
||
3539 | clevermous | 207 | ; Ожидать установки флага прерывания НГМД |
2288 | clevermous | 208 | @@TestRS_2: |
3771 | mario79 | 209 | call change_task |
2288 | clevermous | 210 | cmp [FDD_IntFlag], 0 |
3539 | clevermous | 211 | jnz @@End_7 ;прерывание произошло |
2288 | clevermous | 212 | mov eax, [timer_ticks] |
213 | sub eax, [TickCounter] |
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4273 | clevermous | 214 | cmp eax, 200;50 ;25 ;5 ;ожидать 5 тиков |
2288 | clevermous | 215 | jb @@TestRS_2 |
216 | ; jl @@TestRS_2 |
||
3539 | clevermous | 217 | ; Ошибка тайм-аута |
4273 | clevermous | 218 | ; dbgstr 'WaitFDCInterrupt: timeout' |
2288 | clevermous | 219 | mov [FDC_Status], FDC_TimeOut |
220 | @@End_7: |
||
221 | popa |
||
222 | ret |
||
223 | |||
224 | ;********************************* |
||
3539 | clevermous | 225 | ;* ВКЛЮЧИТЬ МОТОР ДИСКОВОДА "A:" * |
2288 | clevermous | 226 | ;********************************* |
227 | FDDMotorON: |
||
4273 | clevermous | 228 | ; dbgstr 'FDDMotorON' |
2288 | clevermous | 229 | pusha |
230 | ; cmp [fdd_motor_status],1 |
||
231 | ; je fdd_motor_on |
||
232 | mov al, [flp_number] |
||
233 | cmp [fdd_motor_status], al |
||
234 | je fdd_motor_on |
||
3539 | clevermous | 235 | ; Произвести сброс контроллера НГМД |
236 | mov DX, 3F2h;порт управления двигателями |
||
2288 | clevermous | 237 | mov AL, 0 |
238 | out DX, AL |
||
3539 | clevermous | 239 | ; Выбрать и включить мотор дисковода |
2288 | clevermous | 240 | cmp [flp_number], 1 |
241 | jne FDDMotorON_B |
||
242 | ; call FDDMotorOFF_B |
||
243 | mov AL, 1Ch ; Floppy A |
||
244 | jmp FDDMotorON_1 |
||
245 | FDDMotorON_B: |
||
246 | ; call FDDMotorOFF_A |
||
247 | mov AL, 2Dh ; Floppy B |
||
248 | FDDMotorON_1: |
||
249 | out DX, AL |
||
3539 | clevermous | 250 | ; Обнулить счетчик тиков |
2288 | clevermous | 251 | mov eax, [timer_ticks] |
252 | mov [TickCounter], eax |
||
3539 | clevermous | 253 | ; Ожидать 0,5 с |
2288 | clevermous | 254 | @@dT: |
255 | call change_task |
||
256 | mov eax, [timer_ticks] |
||
257 | sub eax, [TickCounter] |
||
258 | cmp eax, 50 ;10 |
||
259 | jb @@dT |
||
4273 | clevermous | 260 | ; Read results of RESET command |
261 | push 4 |
||
262 | ; DEBUGF 1,'K : floppy reset results:' |
||
263 | @@: |
||
264 | mov al, 8 |
||
265 | call FDCDataOutput |
||
266 | call FDCDataInput |
||
267 | ; DEBUGF 1,' %x',al |
||
268 | call FDCDataInput |
||
269 | ; DEBUGF 1,' %x',al |
||
270 | dec dword [esp] |
||
271 | jnz @b |
||
272 | ; DEBUGF 1,'\n' |
||
273 | pop eax |
||
2288 | clevermous | 274 | cmp [flp_number], 1 |
275 | jne fdd_motor_on_B |
||
276 | mov [fdd_motor_status], 1 |
||
277 | jmp fdd_motor_on |
||
278 | fdd_motor_on_B: |
||
279 | mov [fdd_motor_status], 2 |
||
280 | fdd_motor_on: |
||
281 | call save_timer_fdd_motor |
||
282 | popa |
||
283 | ret |
||
284 | |||
285 | ;***************************************** |
||
3539 | clevermous | 286 | ;* СОХРАНЕНИЕ УКАЗАТЕЛЯ ВРЕМЕНИ * |
2288 | clevermous | 287 | ;***************************************** |
288 | save_timer_fdd_motor: |
||
289 | mov eax, [timer_ticks] |
||
290 | mov [timer_fdd_motor], eax |
||
291 | ret |
||
292 | |||
293 | ;***************************************** |
||
3539 | clevermous | 294 | ;* ПРОВЕРКА ЗАДЕРЖКИ ВЫКЛЮЧЕНИЯ МОТОРА * |
2288 | clevermous | 295 | ;***************************************** |
3534 | clevermous | 296 | proc check_fdd_motor_status_has_work? |
297 | cmp [fdd_motor_status], 0 |
||
298 | jz .no |
||
299 | mov eax, [timer_ticks] |
||
300 | sub eax, [timer_fdd_motor] |
||
301 | cmp eax, 500 |
||
302 | jb .no |
||
303 | .yes: |
||
304 | xor eax, eax |
||
305 | inc eax |
||
306 | ret |
||
307 | .no: |
||
308 | xor eax, eax |
||
309 | ret |
||
310 | endp |
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311 | |||
2288 | clevermous | 312 | align 4 |
313 | check_fdd_motor_status: |
||
314 | cmp [fdd_motor_status], 0 |
||
315 | je end_check_fdd_motor_status_1 |
||
316 | mov eax, [timer_ticks] |
||
317 | sub eax, [timer_fdd_motor] |
||
318 | cmp eax, 500 |
||
319 | jb end_check_fdd_motor_status |
||
320 | call FDDMotorOFF |
||
321 | mov [fdd_motor_status], 0 |
||
322 | end_check_fdd_motor_status_1: |
||
323 | end_check_fdd_motor_status: |
||
324 | ret |
||
325 | |||
326 | ;********************************** |
||
3539 | clevermous | 327 | ;* ВЫКЛЮЧИТЬ МОТОР ДИСКОВОДА * |
2288 | clevermous | 328 | ;********************************** |
329 | FDDMotorOFF: |
||
4273 | clevermous | 330 | ; dbgstr 'FDDMotorOFF' |
2288 | clevermous | 331 | push AX |
332 | push DX |
||
333 | cmp [flp_number], 1 |
||
334 | jne FDDMotorOFF_1 |
||
335 | call FDDMotorOFF_A |
||
336 | jmp FDDMotorOFF_2 |
||
337 | FDDMotorOFF_1: |
||
338 | call FDDMotorOFF_B |
||
339 | FDDMotorOFF_2: |
||
340 | pop DX |
||
341 | pop AX |
||
3539 | clevermous | 342 | ; сброс флагов кеширования в связи с устареванием информации |
4273 | clevermous | 343 | or [floppy_media_flags+0], FLOPPY_MEDIA_NEED_RESCAN |
344 | or [floppy_media_flags+1], FLOPPY_MEDIA_NEED_RESCAN |
||
2288 | clevermous | 345 | ret |
346 | |||
347 | FDDMotorOFF_A: |
||
3539 | clevermous | 348 | mov DX, 3F2h;порт управления двигателями |
2288 | clevermous | 349 | mov AL, 0Ch ; Floppy A |
350 | out DX, AL |
||
351 | ret |
||
352 | |||
353 | FDDMotorOFF_B: |
||
3539 | clevermous | 354 | mov DX, 3F2h;порт управления двигателями |
2288 | clevermous | 355 | mov AL, 5h ; Floppy B |
356 | out DX, AL |
||
357 | ret |
||
358 | |||
359 | ;******************************* |
||
3539 | clevermous | 360 | ;* РЕКАЛИБРОВКА ДИСКОВОДА "A:" * |
2288 | clevermous | 361 | ;******************************* |
362 | RecalibrateFDD: |
||
4273 | clevermous | 363 | ; dbgstr 'RecalibrateFDD' |
2288 | clevermous | 364 | pusha |
365 | call save_timer_fdd_motor |
||
4273 | clevermous | 366 | ; Сбросить флаг прерывания |
367 | mov [FDD_IntFlag], 0 |
||
3539 | clevermous | 368 | ; Подать команду "Рекалибровка" |
2288 | clevermous | 369 | mov AL, 07h |
370 | call FDCDataOutput |
||
371 | mov AL, 00h |
||
372 | call FDCDataOutput |
||
3539 | clevermous | 373 | ; Ожидать завершения операции |
2288 | clevermous | 374 | call WaitFDCInterrupt |
4273 | clevermous | 375 | cmp [FDC_Status], 0 |
376 | jne .fail |
||
377 | ; Read results of RECALIBRATE command |
||
378 | ; DEBUGF 1,'K : floppy recalibrate results:' |
||
379 | mov al, 8 |
||
380 | call FDCDataOutput |
||
381 | call FDCDataInput |
||
4695 | clevermous | 382 | push eax |
4273 | clevermous | 383 | ; DEBUGF 1,' %x',al |
384 | call FDCDataInput |
||
385 | ; DEBUGF 1,' %x',al |
||
386 | ; DEBUGF 1,'\n' |
||
4695 | clevermous | 387 | pop eax |
388 | test al, 0xC0 |
||
389 | jz @f |
||
390 | mov [FDC_Status], FDC_DiskNotFound |
||
391 | @@: |
||
4273 | clevermous | 392 | .fail: |
2288 | clevermous | 393 | call save_timer_fdd_motor |
394 | popa |
||
395 | ret |
||
396 | |||
397 | ;***************************************************** |
||
3539 | clevermous | 398 | ;* ПОИСК ДОРОЖКИ * |
399 | ;* Параметры передаются через глобальные переменные: * |
||
400 | ;* FDD_Track - номер дорожки (0-79); * |
||
401 | ;* FDD_Head - номер головки (0-1). * |
||
402 | ;* Результат операции заносится в FDC_Status. * |
||
2288 | clevermous | 403 | ;***************************************************** |
404 | SeekTrack: |
||
4273 | clevermous | 405 | ; dbgstr 'SeekTrack' |
2288 | clevermous | 406 | pusha |
407 | call save_timer_fdd_motor |
||
4115 | mario79 | 408 | ; Сбросить флаг прерывания |
409 | mov [FDD_IntFlag], 0 |
||
3539 | clevermous | 410 | ; Подать команду "Поиск" |
2288 | clevermous | 411 | mov AL, 0Fh |
412 | call FDCDataOutput |
||
3539 | clevermous | 413 | ; Передать байт номера головки/накопител |
2288 | clevermous | 414 | mov AL, [FDD_Head] |
415 | shl AL, 2 |
||
416 | call FDCDataOutput |
||
3539 | clevermous | 417 | ; Передать байт номера дорожки |
2288 | clevermous | 418 | mov AL, [FDD_Track] |
419 | call FDCDataOutput |
||
3539 | clevermous | 420 | ; Ожидать завершения операции |
2288 | clevermous | 421 | call WaitFDCInterrupt |
422 | cmp [FDC_Status], FDC_Normal |
||
423 | jne @@Exit |
||
3539 | clevermous | 424 | ; Сохранить результат поиска |
2288 | clevermous | 425 | mov AL, 08h |
426 | call FDCDataOutput |
||
427 | call FDCDataInput |
||
428 | mov [FDC_ST0], AL |
||
429 | call FDCDataInput |
||
430 | mov [FDC_C], AL |
||
3539 | clevermous | 431 | ; Проверить результат поиска |
432 | ; Поиск завершен? |
||
2288 | clevermous | 433 | test [FDC_ST0], 100000b |
434 | je @@Err |
||
3539 | clevermous | 435 | ; Заданный трек найден? |
2288 | clevermous | 436 | mov AL, [FDC_C] |
437 | cmp AL, [FDD_Track] |
||
438 | jne @@Err |
||
3539 | clevermous | 439 | ; Номер головки совпадает с заданным? |
4273 | clevermous | 440 | ; The H bit (Head Address) in ST0 will always return a "0" (c) 82077AA datasheet, |
441 | ; description of SEEK command. So we can not verify the proper head. |
||
442 | ; mov AL, [FDC_ST0] |
||
443 | ; and AL, 100b |
||
444 | ; shr AL, 2 |
||
445 | ; cmp AL, [FDD_Head] |
||
446 | ; jne @@Err |
||
3539 | clevermous | 447 | ; Операция завершена успешно |
4273 | clevermous | 448 | ; dbgstr 'SeekTrack: FDC_Normal' |
2288 | clevermous | 449 | mov [FDC_Status], FDC_Normal |
450 | jmp @@Exit |
||
3539 | clevermous | 451 | @@Err: ; Трек не найден |
4273 | clevermous | 452 | ; dbgstr 'SeekTrack: FDC_TrackNotFound' |
2288 | clevermous | 453 | mov [FDC_Status], FDC_TrackNotFound |
454 | @@Exit: |
||
455 | call save_timer_fdd_motor |
||
456 | popa |
||
457 | ret |
||
458 | |||
459 | ;******************************************************* |
||
3539 | clevermous | 460 | ;* ЧТЕНИЕ СЕКТОРА ДАННЫХ * |
461 | ;* Параметры передаются через глобальные переменные: * |
||
462 | ;* FDD_Track - номер дорожки (0-79); * |
||
463 | ;* FDD_Head - номер головки (0-1); * |
||
464 | ;* FDD_Sector - номер сектора (1-18). * |
||
465 | ;* Результат операции заносится в FDC_Status. * |
||
466 | ;* В случае успешного выполнения операции чтения * |
||
467 | ;* содержимое сектора будет занесено в FDD_DataBuffer. * |
||
2288 | clevermous | 468 | ;******************************************************* |
469 | ReadSector: |
||
4273 | clevermous | 470 | ; dbgstr 'ReadSector' |
2288 | clevermous | 471 | pushad |
472 | call save_timer_fdd_motor |
||
4115 | mario79 | 473 | ; Сбросить флаг прерывания |
474 | mov [FDD_IntFlag], 0 |
||
3539 | clevermous | 475 | ; Установить скорость передачи 500 Кбайт/с |
2288 | clevermous | 476 | mov AX, 0 |
477 | mov DX, 03F7h |
||
478 | out DX, AL |
||
3539 | clevermous | 479 | ; Инициализировать канал прямого доступа к памяти |
2288 | clevermous | 480 | mov [dmamode], 0x46 |
481 | call Init_FDC_DMA |
||
3539 | clevermous | 482 | ; Подать команду "Чтение данных" |
483 | mov AL, 0E6h ;чтение в мультитрековом режиме |
||
2288 | clevermous | 484 | call FDCDataOutput |
485 | mov AL, [FDD_Head] |
||
486 | shl AL, 2 |
||
487 | call FDCDataOutput |
||
488 | mov AL, [FDD_Track] |
||
489 | call FDCDataOutput |
||
490 | mov AL, [FDD_Head] |
||
491 | call FDCDataOutput |
||
492 | mov AL, [FDD_Sector] |
||
493 | call FDCDataOutput |
||
3539 | clevermous | 494 | mov AL, 2 ;код размера сектора (512 байт) |
2288 | clevermous | 495 | call FDCDataOutput |
3539 | clevermous | 496 | mov AL, 18 ;+1; 3Fh ;число секторов на дорожке |
2288 | clevermous | 497 | call FDCDataOutput |
3539 | clevermous | 498 | mov AL, 1Bh ;значение GPL |
2288 | clevermous | 499 | call FDCDataOutput |
3539 | clevermous | 500 | mov AL, 0FFh;значение DTL |
2288 | clevermous | 501 | call FDCDataOutput |
3539 | clevermous | 502 | ; Ожидаем прерывание по завершении операции |
2288 | clevermous | 503 | call WaitFDCInterrupt |
504 | cmp [FDC_Status], FDC_Normal |
||
505 | jne @@Exit_1 |
||
3539 | clevermous | 506 | ; Считываем статус завершения операции |
2288 | clevermous | 507 | call GetStatusInfo |
508 | test [FDC_ST0], 11011000b |
||
509 | jnz @@Err_1 |
||
4273 | clevermous | 510 | ; dbgstr 'ReadSector: FDC_Normal' |
2288 | clevermous | 511 | mov [FDC_Status], FDC_Normal |
512 | jmp @@Exit_1 |
||
513 | @@Err_1: |
||
4273 | clevermous | 514 | ; dbgstr 'ReadSector: FDC_SectorNotFound' |
2288 | clevermous | 515 | mov [FDC_Status], FDC_SectorNotFound |
516 | @@Exit_1: |
||
517 | call save_timer_fdd_motor |
||
518 | popad |
||
519 | ret |
||
520 | |||
521 | ;******************************************************* |
||
3539 | clevermous | 522 | ;* ЧТЕНИЕ СЕКТОРА (С ПОВТОРЕНИЕМ ОПЕРАЦИИ ПРИ СБОЕ) * |
523 | ;* Параметры передаются через глобальные переменные: * |
||
524 | ;* FDD_Track - номер дорожки (0-79); * |
||
525 | ;* FDD_Head - номер головки (0-1); * |
||
526 | ;* FDD_Sector - номер сектора (1-18). * |
||
527 | ;* Результат операции заносится в FDC_Status. * |
||
528 | ;* В случае успешного выполнения операции чтения * |
||
529 | ;* содержимое сектора будет занесено в FDD_DataBuffer. * |
||
2288 | clevermous | 530 | ;******************************************************* |
531 | ReadSectWithRetr: |
||
532 | pusha |
||
3539 | clevermous | 533 | ; Обнулить счетчик повторения операции рекалибровки |
2288 | clevermous | 534 | mov [RecalRepCounter], 0 |
535 | @@TryAgain: |
||
3539 | clevermous | 536 | ; Обнулить счетчик повторения операции чтени |
2288 | clevermous | 537 | mov [ReadRepCounter], 0 |
538 | @@ReadSector_1: |
||
539 | call ReadSector |
||
540 | cmp [FDC_Status], 0 |
||
541 | je @@Exit_2 |
||
542 | cmp [FDC_Status], 1 |
||
543 | je @@Err_3 |
||
3539 | clevermous | 544 | ; Троекратное повторение чтени |
2288 | clevermous | 545 | inc [ReadRepCounter] |
546 | cmp [ReadRepCounter], 3 |
||
547 | jb @@ReadSector_1 |
||
3539 | clevermous | 548 | ; Троекратное повторение рекалибровки |
2288 | clevermous | 549 | call RecalibrateFDD |
550 | call SeekTrack |
||
551 | inc [RecalRepCounter] |
||
552 | cmp [RecalRepCounter], 3 |
||
553 | jb @@TryAgain |
||
554 | @@Exit_2: |
||
555 | popa |
||
556 | ret |
||
557 | @@Err_3: |
||
558 | popa |
||
559 | ret |
||
560 | |||
561 | ;******************************************************* |
||
3539 | clevermous | 562 | ;* ЗАПИСЬ СЕКТОРА ДАННЫХ * |
563 | ;* Параметры передаются через глобальные переменные: * |
||
564 | ;* FDD_Track - номер дорожки (0-79); * |
||
565 | ;* FDD_Head - номер головки (0-1); * |
||
566 | ;* FDD_Sector - номер сектора (1-18). * |
||
567 | ;* Результат операции заносится в FDC_Status. * |
||
568 | ;* В случае успешного выполнения операции записи * |
||
569 | ;* содержимое FDD_DataBuffer будет занесено в сектор. * |
||
2288 | clevermous | 570 | ;******************************************************* |
571 | WriteSector: |
||
4273 | clevermous | 572 | ; dbgstr 'WriteSector' |
2288 | clevermous | 573 | pushad |
574 | call save_timer_fdd_motor |
||
4115 | mario79 | 575 | ; Сбросить флаг прерывания |
576 | mov [FDD_IntFlag], 0 |
||
3539 | clevermous | 577 | ; Установить скорость передачи 500 Кбайт/с |
2288 | clevermous | 578 | mov AX, 0 |
579 | mov DX, 03F7h |
||
580 | out DX, AL |
||
3539 | clevermous | 581 | ; Инициализировать канал прямого доступа к памяти |
2288 | clevermous | 582 | mov [dmamode], 0x4A |
583 | call Init_FDC_DMA |
||
3539 | clevermous | 584 | ; Подать команду "Запись данных" |
585 | mov AL, 0xC5 ;0x45 ;запись в мультитрековом режиме |
||
2288 | clevermous | 586 | call FDCDataOutput |
587 | mov AL, [FDD_Head] |
||
588 | shl AL, 2 |
||
589 | call FDCDataOutput |
||
590 | mov AL, [FDD_Track] |
||
591 | call FDCDataOutput |
||
592 | mov AL, [FDD_Head] |
||
593 | call FDCDataOutput |
||
594 | mov AL, [FDD_Sector] |
||
595 | call FDCDataOutput |
||
3539 | clevermous | 596 | mov AL, 2 ;код размера сектора (512 байт) |
2288 | clevermous | 597 | call FDCDataOutput |
3539 | clevermous | 598 | mov AL, 18; 3Fh ;число секторов на дорожке |
2288 | clevermous | 599 | call FDCDataOutput |
3539 | clevermous | 600 | mov AL, 1Bh ;значение GPL |
2288 | clevermous | 601 | call FDCDataOutput |
3539 | clevermous | 602 | mov AL, 0FFh;значение DTL |
2288 | clevermous | 603 | call FDCDataOutput |
3539 | clevermous | 604 | ; Ожидаем прерывание по завершении операции |
2288 | clevermous | 605 | call WaitFDCInterrupt |
606 | cmp [FDC_Status], FDC_Normal |
||
607 | jne @@Exit_3 |
||
3539 | clevermous | 608 | ; Считываем статус завершения операции |
2288 | clevermous | 609 | call GetStatusInfo |
610 | test [FDC_ST0], 11000000b ;11011000b |
||
611 | jnz @@Err_2 |
||
612 | mov [FDC_Status], FDC_Normal |
||
613 | jmp @@Exit_3 |
||
614 | @@Err_2: |
||
615 | mov [FDC_Status], FDC_SectorNotFound |
||
616 | @@Exit_3: |
||
617 | call save_timer_fdd_motor |
||
618 | popad |
||
619 | ret |
||
620 | |||
621 | ;******************************************************* |
||
3539 | clevermous | 622 | ;* ЗАПИСЬ СЕКТОРА (С ПОВТОРЕНИЕМ ОПЕРАЦИИ ПРИ СБОЕ) * |
623 | ;* Параметры передаются через глобальные переменные: * |
||
624 | ;* FDD_Track - номер дорожки (0-79); * |
||
625 | ;* FDD_Head - номер головки (0-1); * |
||
626 | ;* FDD_Sector - номер сектора (1-18). * |
||
627 | ;* Результат операции заносится в FDC_Status. * |
||
628 | ;* В случае успешного выполнения операции записи * |
||
629 | ;* содержимое FDD_DataBuffer будет занесено в сектор. * |
||
2288 | clevermous | 630 | ;******************************************************* |
631 | WriteSectWithRetr: |
||
632 | pusha |
||
3539 | clevermous | 633 | ; Обнулить счетчик повторения операции рекалибровки |
2288 | clevermous | 634 | mov [RecalRepCounter], 0 |
635 | @@TryAgain_1: |
||
3539 | clevermous | 636 | ; Обнулить счетчик повторения операции чтени |
2288 | clevermous | 637 | mov [ReadRepCounter], 0 |
638 | @@WriteSector_1: |
||
639 | call WriteSector |
||
640 | cmp [FDC_Status], 0 |
||
641 | je @@Exit_4 |
||
642 | cmp [FDC_Status], 1 |
||
643 | je @@Err_4 |
||
3539 | clevermous | 644 | ; Троекратное повторение чтени |
2288 | clevermous | 645 | inc [ReadRepCounter] |
646 | cmp [ReadRepCounter], 3 |
||
647 | jb @@WriteSector_1 |
||
3539 | clevermous | 648 | ; Троекратное повторение рекалибровки |
2288 | clevermous | 649 | call RecalibrateFDD |
650 | call SeekTrack |
||
651 | inc [RecalRepCounter] |
||
652 | cmp [RecalRepCounter], 3 |
||
653 | jb @@TryAgain_1 |
||
654 | @@Exit_4: |
||
655 | popa |
||
656 | ret |
||
657 | @@Err_4: |
||
658 | popa |
||
659 | ret |
||
660 | |||
661 | ;********************************************* |
||
3539 | clevermous | 662 | ;* ПОЛУЧИТЬ ИНФОРМАЦИЮ О РЕЗУЛЬТАТЕ ОПЕРАЦИИ * |
2288 | clevermous | 663 | ;********************************************* |
664 | GetStatusInfo: |
||
665 | push AX |
||
666 | call FDCDataInput |
||
667 | mov [FDC_ST0], AL |
||
668 | call FDCDataInput |
||
669 | mov [FDC_ST1], AL |
||
670 | call FDCDataInput |
||
671 | mov [FDC_ST2], AL |
||
672 | call FDCDataInput |
||
673 | mov [FDC_C], AL |
||
674 | call FDCDataInput |
||
675 | mov [FDC_H], AL |
||
676 | call FDCDataInput |
||
677 | mov [FDC_R], AL |
||
678 | call FDCDataInput |
||
679 | mov [FDC_N], AL |
||
680 | pop AX |
||
681 | ret |
||
682 | |||
4273 | clevermous | 683 | ; Interface for disk subsystem. |
684 | ; Assume fixed capacity for 1.44M. |
||
685 | FLOPPY_CAPACITY = 2880 ; in sectors |
||
686 | |||
687 | iglobal |
||
688 | align 4 |
||
689 | floppy_functions: |
||
690 | dd .size |
||
691 | dd 0 ; no close() function |
||
692 | dd 0 ; no closemedia() function |
||
693 | dd floppy_querymedia |
||
694 | dd floppy_read |
||
695 | dd floppy_write |
||
696 | dd 0 ; no flush() function |
||
697 | dd 0 ; no adjust_cache_size() function |
||
698 | .size = $ - floppy_functions |
||
699 | endg |
||
700 | |||
701 | uglobal |
||
702 | floppy_media_flags rb 2 |
||
703 | n_sector dd 0 ; temporary save for sector value |
||
704 | flp_number db 0 ; 1- Floppy A, 2-Floppy B |
||
705 | old_track db 0 ; old value track |
||
706 | flp_label rb 15*2 ; Label and ID of inserted floppy disk |
||
707 | align 4 |
||
708 | ; Hardware does not allow to work with two floppies in parallel, |
||
709 | ; so there is one mutex guarding access to any floppy. |
||
710 | floppy_mutex MUTEX |
||
711 | endg |
||
712 | ; Meaning of bits in floppy_media_flags |
||
713 | FLOPPY_MEDIA_PRESENT = 1 ; media was present when last asked |
||
714 | FLOPPY_MEDIA_NEED_RESCAN = 2 ; media was possibly changed, need to rescan |
||
715 | FLOPPY_MEDIA_LABEL_CHANGED = 4 ; temporary state |
||
716 | |||
717 | iglobal |
||
718 | floppy1_name db 'fd',0 |
||
719 | floppy2_name db 'fd2',0 |
||
720 | endg |
||
721 | |||
722 | ; This function is called in boot process. |
||
723 | ; It creates filesystems /fd and/or /fd2, if the system has one/two floppy drives. |
||
724 | proc floppy_init |
||
725 | mov ecx, floppy_mutex |
||
726 | call mutex_init |
||
727 | ; First floppy is present if [DRIVE_DATA] and 0xF0 is nonzero. |
||
728 | test byte [DRIVE_DATA], 0xF0 |
||
729 | jz .no1 |
||
730 | stdcall disk_add, floppy_functions, floppy1_name, 1, DISK_NO_INSERT_NOTIFICATION |
||
731 | .no1: |
||
732 | ; Second floppy is present if [DRIVE_DATA] and 0x0F is nonzero. |
||
733 | test byte [DRIVE_DATA], 0x0F |
||
734 | jz .no2 |
||
735 | stdcall disk_add, floppy_functions, floppy2_name, 2, DISK_NO_INSERT_NOTIFICATION |
||
736 | .no2: |
||
737 | ret |
||
738 | endp |
||
739 | |||
740 | ; Returns information about disk media. |
||
741 | ; Floppy drives do not support insert notifications, |
||
742 | ; DISK_NO_INSERT_NOTIFICATION is set, |
||
743 | ; the disk subsystem calls this function before each filesystem operation. |
||
744 | ; If the media has changed, return error for the first call as signal |
||
745 | ; to finalize work with old media and the true geometry for the second call. |
||
746 | ; Assume that media is (possibly) changed anytime when motor is off. |
||
747 | proc floppy_querymedia |
||
748 | virtual at esp+4 |
||
749 | .userdata dd ? |
||
750 | .info dd ? |
||
751 | end virtual |
||
752 | ; 1. Acquire the global lock. |
||
753 | mov ecx, floppy_mutex |
||
754 | call mutex_lock |
||
755 | mov edx, [.userdata] ; 1 for /fd, 2 for /fd2 |
||
756 | ; 2. If the media was reported and has been changed, forget it and report an error. |
||
757 | mov al, [floppy_media_flags+edx-1] |
||
758 | and al, FLOPPY_MEDIA_PRESENT + FLOPPY_MEDIA_NEED_RESCAN |
||
759 | cmp al, FLOPPY_MEDIA_PRESENT + FLOPPY_MEDIA_NEED_RESCAN |
||
760 | jnz .not_reported |
||
761 | .no_media: |
||
762 | mov [floppy_media_flags+edx-1], 0 |
||
763 | .return_no_media: |
||
764 | mov ecx, floppy_mutex |
||
765 | call mutex_unlock |
||
766 | mov eax, DISK_STATUS_NO_MEDIA |
||
767 | retn 8 |
||
768 | .not_reported: |
||
769 | ; 3. If we are in the temporary state LABEL_CHANGED, this is the second call |
||
770 | ; after intermediate DISK_STATUS_NO_MEDIA due to media change; |
||
771 | ; clear the flag and return the current geometry without rereading the bootsector. |
||
772 | cmp [floppy_media_flags+edx-1], FLOPPY_MEDIA_LABEL_CHANGED |
||
773 | jz .report_geometry |
||
774 | ; 4. Try to read the bootsector. |
||
775 | mov [flp_number], dl |
||
776 | mov [FDC_Status], 0 |
||
777 | call floppy_read_bootsector |
||
778 | ; 5. If reading bootsector failed, assume that media is not present. |
||
779 | mov edx, [.userdata] |
||
780 | cmp [FDC_Status], 0 |
||
781 | jnz .no_media |
||
782 | ; 6. Check whether the previous status is "present". If not, go to 10. |
||
783 | push esi edi |
||
784 | imul edi, edx, 15 |
||
785 | add edi, flp_label-15 |
||
786 | mov esi, FDD_BUFF+39 |
||
787 | mov ecx, 15 |
||
788 | test [floppy_media_flags+edx-1], FLOPPY_MEDIA_PRESENT |
||
789 | jz .set_label |
||
790 | ; 7. Compare the old label with the current one. |
||
791 | rep cmpsb |
||
792 | ; 8. If the label has not changed, go to 11. |
||
793 | jz .ok |
||
794 | ; 9. If the label has changed, store it, enter temporary state LABEL_CHANGED |
||
795 | ; and report DISK_STATUS_NO_MEDIA. |
||
796 | ; dbgstr 'floppy label changed' |
||
797 | add esi, ecx |
||
798 | add edi, ecx |
||
799 | mov ecx, 15 |
||
800 | sub esi, ecx |
||
801 | sub edi, ecx |
||
802 | rep movsb |
||
803 | mov [floppy_media_flags+edx-1], FLOPPY_MEDIA_LABEL_CHANGED |
||
804 | pop edi esi |
||
805 | jmp .return_no_media |
||
806 | .set_label: |
||
807 | ; 10. The previous state was "not present". Copy the label. |
||
808 | rep movsb |
||
809 | .ok: |
||
810 | pop edi esi |
||
811 | .report_geometry: |
||
812 | ; 11. Fill DISKMEDIAINFO structure. |
||
813 | mov ecx, [.info] |
||
814 | and [ecx+DISKMEDIAINFO.Flags], 0 |
||
815 | mov [ecx+DISKMEDIAINFO.SectorSize], 512 |
||
816 | mov dword [ecx+DISKMEDIAINFO.Capacity], FLOPPY_CAPACITY |
||
817 | and dword [ecx+DISKMEDIAINFO.Capacity+4], 0 |
||
818 | ; 12. Update state: media is present, data are actual. |
||
819 | mov [floppy_media_flags+edx-1], FLOPPY_MEDIA_PRESENT |
||
820 | ; 13. Release the global lock and return successful status. |
||
821 | mov ecx, floppy_mutex |
||
822 | call mutex_unlock |
||
823 | xor eax, eax |
||
824 | retn 8 |
||
825 | endp |
||
826 | |||
827 | proc floppy_read_bootsector |
||
828 | pushad |
||
829 | mov [FDD_Track], 0; Цилиндр |
||
830 | mov [FDD_Head], 0; Сторона |
||
831 | mov [FDD_Sector], 1; Сектор |
||
832 | call FDDMotorON |
||
833 | call RecalibrateFDD |
||
834 | cmp [FDC_Status], 0 |
||
835 | jne .nothing |
||
836 | call SeekTrack |
||
837 | cmp [FDC_Status], 0 |
||
838 | jne .nothing |
||
839 | call ReadSectWithRetr |
||
840 | .nothing: |
||
841 | popad |
||
842 | ret |
||
843 | endp |
||
844 | |||
845 | read_chs_sector: |
||
846 | call calculate_chs |
||
847 | call ReadSectWithRetr |
||
848 | ret |
||
849 | |||
850 | save_chs_sector: |
||
851 | call calculate_chs |
||
852 | call WriteSectWithRetr |
||
853 | ret |
||
854 | |||
855 | calculate_chs: |
||
856 | mov bl, [FDD_Track] |
||
857 | mov [old_track], bl |
||
858 | mov ebx, 18 |
||
859 | xor edx, edx |
||
860 | div ebx |
||
861 | inc edx |
||
862 | mov [FDD_Sector], dl |
||
863 | mov edx, eax |
||
864 | shr eax, 1 |
||
865 | and edx, 1 |
||
866 | mov [FDD_Track], al |
||
867 | mov [FDD_Head], dl |
||
868 | mov dl, [old_track] |
||
869 | cmp dl, [FDD_Track] |
||
870 | je no_seek_track_1 |
||
871 | call SeekTrack |
||
872 | no_seek_track_1: |
||
873 | ret |
||
874 | |||
875 | ; Writes one or more sectors to the device. |
||
876 | proc floppy_write |
||
877 | mov dl, 1 |
||
878 | jmp floppy_read_write |
||
879 | endp |
||
880 | |||
881 | ; Reads one or more sectors from the device. |
||
882 | proc floppy_read |
||
883 | mov dl, 0 |
||
884 | endp |
||
885 | |||
886 | ; Common part of floppy_read and floppy_write. |
||
887 | proc floppy_read_write userdata:dword, buffer:dword, start_sector:qword, numsectors_ptr:dword |
||
888 | virtual at ebp-8 |
||
889 | .sectors_todo dd ? |
||
890 | .operation db ? |
||
891 | end virtual |
||
892 | push edx ; save operation code to [.operation] |
||
893 | ; 1. Get number of sectors to read/write |
||
894 | ; and zero number of sectors that were actually read/written. |
||
895 | mov eax, [numsectors_ptr] |
||
896 | push dword [eax] ; initialize [.sectors_todo] |
||
897 | and dword [eax], 0 |
||
898 | push ebx esi edi ; save used registers to be stdcall |
||
899 | ; 2. Acquire the global lock. |
||
900 | mov ecx, floppy_mutex |
||
901 | call mutex_lock |
||
902 | ; 3. Set floppy number for this operation. |
||
903 | mov edx, [userdata] |
||
904 | mov [flp_number], dl |
||
905 | ; 4. Read/write sector-by-sector. |
||
906 | .operation_loop: |
||
907 | ; 4a. Check that the sector is inside the media. |
||
908 | cmp dword [start_sector+4], 0 |
||
909 | jnz .end_of_media |
||
910 | mov eax, dword [start_sector] |
||
911 | cmp eax, FLOPPY_CAPACITY |
||
912 | jae .end_of_media |
||
913 | ; 4b. For read operation, call read_chs_sector and then move data from FDD_BUFF to [buffer]. |
||
914 | ; For write operation, move data from [buffer] to FDD_BUFF and then call save_chs_sector. |
||
915 | cmp [.operation], 0 |
||
916 | jz .read |
||
917 | mov esi, [buffer] |
||
918 | mov edi, FDD_BUFF |
||
919 | mov ecx, 512/4 |
||
920 | rep movsd |
||
921 | mov [buffer], esi |
||
922 | call save_chs_sector |
||
923 | jmp @f |
||
924 | .read: |
||
925 | call read_chs_sector |
||
926 | mov esi, FDD_BUFF |
||
927 | mov edi, [buffer] |
||
928 | mov ecx, 512/4 |
||
929 | rep movsd |
||
930 | mov [buffer], edi |
||
931 | @@: |
||
932 | ; 4c. If there was an error, propagate it to the caller. |
||
933 | cmp [FDC_Status], 0 |
||
934 | jnz .fail |
||
935 | ; 4d. Otherwise, increment number of sectors processed and continue the loop. |
||
936 | mov eax, [numsectors_ptr] |
||
937 | inc dword [eax] |
||
938 | inc dword [start_sector] |
||
939 | dec [.sectors_todo] |
||
940 | jnz .operation_loop |
||
941 | ; 5. Release the global lock and return with the correct status. |
||
942 | push 0 |
||
943 | .return: |
||
944 | mov ecx, floppy_mutex |
||
945 | call mutex_unlock |
||
946 | pop eax |
||
947 | pop edi esi ebx ; restore used registers to be stdcall |
||
948 | ret ; this translates to leave/retn N and purges local variables |
||
949 | .fail: |
||
950 | push -1 |
||
951 | jmp .return |
||
952 | .end_of_media: |
||
953 | push DISK_STATUS_END_OF_MEDIA |
||
954 | jmp .return |
||
955 | endp |