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Rev | Author | Line No. | Line |
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2288 | clevermous | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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5363 | yogev_ezra | 3 | ;; Copyright (C) KolibriOS team 2004-2015. 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: 8055 $ |
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9 | |||
10 | |||
11 | ;********************************************************** |
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8054 | rgimad | 12 | ; Direct work with floppy disk drive |
2288 | clevermous | 13 | ;********************************************************** |
8055 | rgimad | 14 | ; Source code author - Kulakov Vladimir Gennadievich. |
15 | ; Adaptation and improvement - Mario79. |
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2288 | clevermous | 16 | |
8054 | rgimad | 17 | ;give_back_application_data: ; give back to application |
2288 | clevermous | 18 | ; mov edi,[TASK_BASE] |
19 | ; mov edi,[edi+TASKDATA.mem_start] |
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20 | ; add edi,ecx |
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21 | give_back_application_data_1: |
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22 | mov esi, FDD_BUFF;FDD_DataBuffer ;0x40000 |
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4273 | clevermous | 23 | mov ecx, 128 |
2288 | clevermous | 24 | cld |
25 | rep movsd |
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26 | ret |
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27 | |||
8054 | rgimad | 28 | ;take_data_from_application: ; take from application |
2288 | clevermous | 29 | ; mov esi,[TASK_BASE] |
30 | ; mov esi,[esi+TASKDATA.mem_start] |
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31 | ; add esi,ecx |
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32 | take_data_from_application_1: |
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33 | mov edi, FDD_BUFF;FDD_DataBuffer ;0x40000 |
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4273 | clevermous | 34 | mov ecx, 128 |
2288 | clevermous | 35 | cld |
36 | rep movsd |
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37 | ret |
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38 | |||
8054 | rgimad | 39 | ; Controller operations result codes (FDC_Status) |
40 | FDC_Normal = 0 ; normal finish |
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41 | FDC_TimeOut = 1 ; time out error |
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42 | FDC_DiskNotFound = 2 ; no disk in drive |
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43 | FDC_TrackNotFound = 3 ; track not found |
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44 | FDC_SectorNotFound = 4 ; sector not found |
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2288 | clevermous | 45 | |
8054 | rgimad | 46 | ; Maximum values of the sector coordinates (specified |
47 | ; values correspond to the parameters of the standard |
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48 | ; 3-inch 1.44 MB floppy disk) |
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7136 | dunkaist | 49 | MAX_Track = 79 |
50 | MAX_Head = 1 |
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51 | MAX_Sector = 18 |
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2288 | clevermous | 52 | |
53 | uglobal |
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8054 | rgimad | 54 | ; Timer tick counter |
2288 | clevermous | 55 | TickCounter dd ? |
8054 | rgimad | 56 | ; Operation completion code with the floppy disk drive controller |
2288 | clevermous | 57 | FDC_Status DB ? |
8054 | rgimad | 58 | ; Interrupt flag from floppy disk drive |
2288 | clevermous | 59 | FDD_IntFlag DB ? |
8054 | rgimad | 60 | ; The moment of the beginning of the last operation with FDD |
2288 | clevermous | 61 | FDD_Time DD ? |
8054 | rgimad | 62 | ; Drive number |
2288 | clevermous | 63 | FDD_Type db 0 |
8054 | rgimad | 64 | ; Sector coordinates |
2288 | clevermous | 65 | FDD_Track DB ? |
66 | FDD_Head DB ? |
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67 | FDD_Sector DB ? |
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68 | |||
8054 | rgimad | 69 | ; Operation result block |
2288 | clevermous | 70 | FDC_ST0 DB ? |
71 | FDC_ST1 DB ? |
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72 | FDC_ST2 DB ? |
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73 | FDC_C DB ? |
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74 | FDC_H DB ? |
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75 | FDC_R DB ? |
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76 | FDC_N DB ? |
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8054 | rgimad | 77 | ; Read operation repetition counter |
2288 | clevermous | 78 | ReadRepCounter DB ? |
8054 | rgimad | 79 | ; Recalibration operation repetition counter |
2288 | clevermous | 80 | RecalRepCounter DB ? |
81 | endg |
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8054 | rgimad | 82 | ; Memory area for storing the readed sector |
2288 | clevermous | 83 | ;FDD_DataBuffer: times 512 db 0 ;DB 512 DUP (?) |
84 | fdd_motor_status db 0 |
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85 | timer_fdd_motor dd 0 |
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86 | |||
8054 | rgimad | 87 | ;************************************** |
88 | ;* INITIALIZATION OF DMA MODE FOR FDD * |
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89 | ;************************************** |
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2288 | clevermous | 90 | Init_FDC_DMA: |
91 | pushad |
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92 | mov al, 0 |
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93 | out 0x0c, al; reset the flip-flop to a known state. |
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94 | mov al, 6 ; mask channel 2 so we can reprogram it. |
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95 | out 0x0a, al |
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96 | mov al, [dmamode]; 0x46 -> Read from floppy - 0x4A Write to floppy |
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97 | out 0x0b, al |
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98 | mov al, 0 |
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99 | out 0x0c, al; reset the flip-flop to a known state. |
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100 | mov eax, 0xD000 |
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101 | out 0x04, al; set the channel 2 starting address to 0 |
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102 | shr eax, 8 |
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103 | out 0x04, al |
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104 | shr eax, 8 |
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105 | out 0x81, al |
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106 | mov al, 0 |
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107 | out 0x0c, al; reset flip-flop |
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108 | mov al, 0xff;set count (actual size -1) |
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109 | out 0x5, al |
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110 | mov al, 0x1;[dmasize] ;(0x1ff = 511 / 0x23ff =9215) |
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111 | out 0x5, al |
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112 | mov al, 2 |
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113 | out 0xa, al |
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114 | popad |
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115 | ret |
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116 | |||
117 | ;*********************************** |
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8054 | rgimad | 118 | ;* WRITE BYTE TO FDC DATA PORT * |
119 | ;* Parameters: * |
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120 | ;* AL - byte to write. * |
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2288 | clevermous | 121 | ;*********************************** |
122 | FDCDataOutput: |
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4273 | clevermous | 123 | ; DEBUGF 1,'K : FDCDataOutput(%x)',al |
2288 | clevermous | 124 | ; pusha |
125 | push eax ecx edx |
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8054 | rgimad | 126 | mov AH, AL ; remember byte to AH |
127 | ; Reset controller state variable |
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2288 | clevermous | 128 | mov [FDC_Status], FDC_Normal |
8054 | rgimad | 129 | ; Check the readiness of the controller to receive data |
130 | mov DX, 3F4h ; (FDC state port) |
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131 | mov ecx, 0x10000 ; set timeout counter |
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2288 | clevermous | 132 | @@TestRS: |
8054 | rgimad | 133 | in AL, DX ; read the RS register |
134 | and AL, 0C0h ; get digits 6 and 7 |
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135 | cmp AL, 80h ; check digits 6 and 7 |
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2288 | clevermous | 136 | je @@OutByteToFDC |
137 | loop @@TestRS |
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8054 | rgimad | 138 | ; Time out error |
4273 | clevermous | 139 | ; DEBUGF 1,' timeout\n' |
2288 | clevermous | 140 | mov [FDC_Status], FDC_TimeOut |
141 | jmp @@End_5 |
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8054 | rgimad | 142 | ; Write byte to data port |
2288 | clevermous | 143 | @@OutByteToFDC: |
144 | inc DX |
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145 | mov AL, AH |
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146 | out DX, AL |
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4273 | clevermous | 147 | ; DEBUGF 1,' ok\n' |
2288 | clevermous | 148 | @@End_5: |
149 | ; popa |
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150 | pop edx ecx eax |
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151 | ret |
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152 | |||
153 | ;****************************************** |
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8054 | rgimad | 154 | ;* READ BYTE FROM FDC DATA PORT * |
155 | ;* Procedure doesnt have input params. * |
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156 | ;* Output : * |
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157 | ;* AL - byte read. * |
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2288 | clevermous | 158 | ;****************************************** |
159 | FDCDataInput: |
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160 | push ECX |
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161 | push DX |
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8054 | rgimad | 162 | ; Reset controller state variable |
2288 | clevermous | 163 | mov [FDC_Status], FDC_Normal |
8054 | rgimad | 164 | ; Check the readiness of the controller to receive data |
165 | mov DX, 3F4h ;(FDC state port) |
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166 | mov ecx, 0x10000 ; set timeout counter |
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2288 | clevermous | 167 | @@TestRS_1: |
8054 | rgimad | 168 | in AL, DX ; read the RS register |
169 | and AL, 0C0h ; get digits 6 and 7 |
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170 | cmp AL, 0C0h ; check digits 6 and 7 |
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2288 | clevermous | 171 | je @@GetByteFromFDC |
172 | loop @@TestRS_1 |
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8054 | rgimad | 173 | ; Time out error |
4273 | clevermous | 174 | ; DEBUGF 1,'K : FDCDataInput: timeout\n' |
2288 | clevermous | 175 | mov [FDC_Status], FDC_TimeOut |
176 | jmp @@End_6 |
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8054 | rgimad | 177 | ; Get byte from data port |
2288 | clevermous | 178 | @@GetByteFromFDC: |
179 | inc DX |
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180 | in AL, DX |
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4273 | clevermous | 181 | ; DEBUGF 1,'K : FDCDataInput: %x\n',al |
2288 | clevermous | 182 | @@End_6: |
183 | pop DX |
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184 | pop ECX |
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185 | ret |
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186 | |||
187 | ;********************************************* |
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8054 | rgimad | 188 | ;* FDC INTERRUPT HANDLER * |
2288 | clevermous | 189 | ;********************************************* |
190 | FDCInterrupt: |
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4273 | clevermous | 191 | ; dbgstr 'FDCInterrupt' |
8054 | rgimad | 192 | ; Set the interrupt flag |
2288 | clevermous | 193 | mov [FDD_IntFlag], 1 |
3771 | mario79 | 194 | mov al, 1 |
2288 | clevermous | 195 | ret |
196 | |||
197 | ;******************************************* |
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8054 | rgimad | 198 | ;* WAIT FOR INTERRUPT FROM FDC * |
2288 | clevermous | 199 | ;******************************************* |
200 | WaitFDCInterrupt: |
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201 | pusha |
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8054 | rgimad | 202 | ; Reset operation status byte |
2288 | clevermous | 203 | mov [FDC_Status], FDC_Normal |
8054 | rgimad | 204 | ; Zero out the tick counter |
2288 | clevermous | 205 | mov eax, [timer_ticks] |
206 | mov [TickCounter], eax |
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8054 | rgimad | 207 | ; Wait for the floppy disk interrupt flag to be set |
2288 | clevermous | 208 | @@TestRS_2: |
3771 | mario79 | 209 | call change_task |
2288 | clevermous | 210 | cmp [FDD_IntFlag], 0 |
8054 | rgimad | 211 | jnz @@End_7 ; interrupt occured |
2288 | clevermous | 212 | mov eax, [timer_ticks] |
213 | sub eax, [TickCounter] |
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8054 | rgimad | 214 | cmp eax, 200;50 ;25 ;5 ; wait 5 ticks |
2288 | clevermous | 215 | jb @@TestRS_2 |
216 | ; jl @@TestRS_2 |
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8054 | rgimad | 217 | ; Time out error |
4273 | clevermous | 218 | ; dbgstr 'WaitFDCInterrupt: timeout' |
2288 | clevermous | 219 | mov [FDC_Status], FDC_TimeOut |
220 | @@End_7: |
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221 | popa |
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222 | ret |
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223 | |||
8054 | rgimad | 224 | ;*********************************** |
225 | ;* Turn on the motor of drive "A:" * |
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226 | ;*********************************** |
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2288 | clevermous | 227 | FDDMotorON: |
4273 | clevermous | 228 | ; dbgstr 'FDDMotorON' |
2288 | clevermous | 229 | pusha |
230 | ; cmp [fdd_motor_status],1 |
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231 | ; je fdd_motor_on |
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232 | mov al, [flp_number] |
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233 | cmp [fdd_motor_status], al |
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234 | je fdd_motor_on |
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8054 | rgimad | 235 | ; Reset the FDD controller |
236 | mov DX, 3F2h ; motor control port |
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2288 | clevermous | 237 | mov AL, 0 |
238 | out DX, AL |
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8054 | rgimad | 239 | ; Select and turn on the drive motor |
2288 | clevermous | 240 | cmp [flp_number], 1 |
241 | jne FDDMotorON_B |
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242 | ; call FDDMotorOFF_B |
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243 | mov AL, 1Ch ; Floppy A |
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244 | jmp FDDMotorON_1 |
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245 | FDDMotorON_B: |
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246 | ; call FDDMotorOFF_A |
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247 | mov AL, 2Dh ; Floppy B |
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248 | FDDMotorON_1: |
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249 | out DX, AL |
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8054 | rgimad | 250 | ; Zero out the tick counter |
2288 | clevermous | 251 | mov eax, [timer_ticks] |
252 | mov [TickCounter], eax |
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8054 | rgimad | 253 | ; wait 0.5 s |
2288 | clevermous | 254 | @@dT: |
255 | call change_task |
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256 | mov eax, [timer_ticks] |
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257 | sub eax, [TickCounter] |
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258 | cmp eax, 50 ;10 |
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259 | jb @@dT |
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4273 | clevermous | 260 | ; Read results of RESET command |
261 | push 4 |
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262 | ; DEBUGF 1,'K : floppy reset results:' |
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263 | @@: |
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264 | mov al, 8 |
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265 | call FDCDataOutput |
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266 | call FDCDataInput |
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267 | ; DEBUGF 1,' %x',al |
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268 | call FDCDataInput |
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269 | ; DEBUGF 1,' %x',al |
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270 | dec dword [esp] |
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271 | jnz @b |
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272 | ; DEBUGF 1,'\n' |
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273 | pop eax |
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2288 | clevermous | 274 | cmp [flp_number], 1 |
275 | jne fdd_motor_on_B |
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276 | mov [fdd_motor_status], 1 |
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277 | jmp fdd_motor_on |
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278 | fdd_motor_on_B: |
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279 | mov [fdd_motor_status], 2 |
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280 | fdd_motor_on: |
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281 | call save_timer_fdd_motor |
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282 | popa |
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283 | ret |
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284 | |||
285 | ;***************************************** |
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8054 | rgimad | 286 | ;* SAVING TIME STAMP * |
2288 | clevermous | 287 | ;***************************************** |
288 | save_timer_fdd_motor: |
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289 | mov eax, [timer_ticks] |
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290 | mov [timer_fdd_motor], eax |
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291 | ret |
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292 | |||
293 | ;***************************************** |
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8054 | rgimad | 294 | ;* CHECK THE MOTOR SHUTDOWN DELAY * |
2288 | clevermous | 295 | ;***************************************** |
3534 | clevermous | 296 | proc check_fdd_motor_status_has_work? |
297 | cmp [fdd_motor_status], 0 |
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298 | jz .no |
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299 | mov eax, [timer_ticks] |
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300 | sub eax, [timer_fdd_motor] |
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301 | cmp eax, 500 |
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302 | jb .no |
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303 | .yes: |
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304 | xor eax, eax |
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305 | inc eax |
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306 | ret |
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307 | .no: |
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308 | xor eax, eax |
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309 | ret |
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310 | endp |
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311 | |||
2288 | clevermous | 312 | align 4 |
313 | check_fdd_motor_status: |
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314 | cmp [fdd_motor_status], 0 |
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315 | je end_check_fdd_motor_status_1 |
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316 | mov eax, [timer_ticks] |
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317 | sub eax, [timer_fdd_motor] |
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318 | cmp eax, 500 |
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319 | jb end_check_fdd_motor_status |
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320 | call FDDMotorOFF |
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321 | mov [fdd_motor_status], 0 |
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322 | end_check_fdd_motor_status_1: |
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323 | end_check_fdd_motor_status: |
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324 | ret |
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325 | |||
326 | ;********************************** |
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8054 | rgimad | 327 | ;* TURN OFF MOTOR OF DRIVE * |
2288 | clevermous | 328 | ;********************************** |
329 | FDDMotorOFF: |
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4273 | clevermous | 330 | ; dbgstr 'FDDMotorOFF' |
2288 | clevermous | 331 | push AX |
332 | push DX |
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333 | cmp [flp_number], 1 |
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334 | jne FDDMotorOFF_1 |
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335 | call FDDMotorOFF_A |
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336 | jmp FDDMotorOFF_2 |
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337 | FDDMotorOFF_1: |
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338 | call FDDMotorOFF_B |
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339 | FDDMotorOFF_2: |
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340 | pop DX |
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341 | pop AX |
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8054 | rgimad | 342 | ; clearing caching flags due to information obsolescence |
4273 | clevermous | 343 | or [floppy_media_flags+0], FLOPPY_MEDIA_NEED_RESCAN |
344 | or [floppy_media_flags+1], FLOPPY_MEDIA_NEED_RESCAN |
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2288 | clevermous | 345 | ret |
346 | |||
347 | FDDMotorOFF_A: |
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8054 | rgimad | 348 | mov DX, 3F2h ; motor control port |
349 | mov AL, 0Ch ; Floppy A |
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2288 | clevermous | 350 | out DX, AL |
351 | ret |
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352 | |||
353 | FDDMotorOFF_B: |
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8054 | rgimad | 354 | mov DX, 3F2h ; motor control port |
355 | mov AL, 5h ; Floppy B |
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2288 | clevermous | 356 | out DX, AL |
357 | ret |
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358 | |||
359 | ;******************************* |
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8054 | rgimad | 360 | ;* RECALIBRATE DRIVE "A:" * |
2288 | clevermous | 361 | ;******************************* |
362 | RecalibrateFDD: |
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4273 | clevermous | 363 | ; dbgstr 'RecalibrateFDD' |
2288 | clevermous | 364 | pusha |
365 | call save_timer_fdd_motor |
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8054 | rgimad | 366 | ; Clear the interrupt flag |
4273 | clevermous | 367 | mov [FDD_IntFlag], 0 |
8054 | rgimad | 368 | ; Send the "Recalibration" command |
2288 | clevermous | 369 | mov AL, 07h |
370 | call FDCDataOutput |
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6814 | dunkaist | 371 | mov AL, [flp_number] |
372 | dec AL |
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2288 | clevermous | 373 | call FDCDataOutput |
8054 | rgimad | 374 | ; Wait for the operation to complete |
2288 | clevermous | 375 | call WaitFDCInterrupt |
4273 | clevermous | 376 | cmp [FDC_Status], 0 |
377 | jne .fail |
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378 | ; Read results of RECALIBRATE command |
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379 | ; DEBUGF 1,'K : floppy recalibrate results:' |
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380 | mov al, 8 |
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381 | call FDCDataOutput |
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382 | call FDCDataInput |
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4695 | clevermous | 383 | push eax |
4273 | clevermous | 384 | ; DEBUGF 1,' %x',al |
385 | call FDCDataInput |
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386 | ; DEBUGF 1,' %x',al |
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387 | ; DEBUGF 1,'\n' |
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4695 | clevermous | 388 | pop eax |
389 | test al, 0xC0 |
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390 | jz @f |
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391 | mov [FDC_Status], FDC_DiskNotFound |
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392 | @@: |
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4273 | clevermous | 393 | .fail: |
2288 | clevermous | 394 | call save_timer_fdd_motor |
395 | popa |
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396 | ret |
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397 | |||
398 | ;***************************************************** |
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8054 | rgimad | 399 | ;* TRACK SEARCH * |
400 | ;* Parameters are passed through global variables: * |
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401 | ;* FDD_Track - track number (0-79); * |
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402 | ;* FDD_Head - head number (0-1). * |
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403 | ;* Result of operation is written to FDC_Status. * |
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2288 | clevermous | 404 | ;***************************************************** |
405 | SeekTrack: |
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4273 | clevermous | 406 | ; dbgstr 'SeekTrack' |
2288 | clevermous | 407 | pusha |
408 | call save_timer_fdd_motor |
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8054 | rgimad | 409 | ; Clear the interrupt flag |
4115 | mario79 | 410 | mov [FDD_IntFlag], 0 |
8054 | rgimad | 411 | ; Send "Search" command |
2288 | clevermous | 412 | mov AL, 0Fh |
413 | call FDCDataOutput |
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8054 | rgimad | 414 | ; Send head / drive number byte |
2288 | clevermous | 415 | mov AL, [FDD_Head] |
416 | shl AL, 2 |
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417 | call FDCDataOutput |
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8054 | rgimad | 418 | ; Send track number byte |
2288 | clevermous | 419 | mov AL, [FDD_Track] |
420 | call FDCDataOutput |
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8054 | rgimad | 421 | ; Wait for the operation to complete |
2288 | clevermous | 422 | call WaitFDCInterrupt |
423 | cmp [FDC_Status], FDC_Normal |
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424 | jne @@Exit |
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8054 | rgimad | 425 | ; Save search result |
2288 | clevermous | 426 | mov AL, 08h |
427 | call FDCDataOutput |
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428 | call FDCDataInput |
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429 | mov [FDC_ST0], AL |
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430 | call FDCDataInput |
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431 | mov [FDC_C], AL |
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8054 | rgimad | 432 | ; Check search result |
433 | ; Is search finished? |
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2288 | clevermous | 434 | test [FDC_ST0], 100000b |
435 | je @@Err |
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8054 | rgimad | 436 | ; Is the specified track found? |
2288 | clevermous | 437 | mov AL, [FDC_C] |
438 | cmp AL, [FDD_Track] |
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439 | jne @@Err |
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8054 | rgimad | 440 | ; Does the head number match the specified one? |
4273 | clevermous | 441 | ; The H bit (Head Address) in ST0 will always return a "0" (c) 82077AA datasheet, |
442 | ; description of SEEK command. So we can not verify the proper head. |
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443 | ; mov AL, [FDC_ST0] |
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444 | ; and AL, 100b |
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445 | ; shr AL, 2 |
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446 | ; cmp AL, [FDD_Head] |
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447 | ; jne @@Err |
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8054 | rgimad | 448 | ; Operation completed successfully |
4273 | clevermous | 449 | ; dbgstr 'SeekTrack: FDC_Normal' |
2288 | clevermous | 450 | mov [FDC_Status], FDC_Normal |
451 | jmp @@Exit |
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8054 | rgimad | 452 | @@Err: ; Track not found |
4273 | clevermous | 453 | ; dbgstr 'SeekTrack: FDC_TrackNotFound' |
2288 | clevermous | 454 | mov [FDC_Status], FDC_TrackNotFound |
455 | @@Exit: |
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456 | call save_timer_fdd_motor |
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457 | popa |
||
458 | ret |
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459 | |||
460 | ;******************************************************* |
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8054 | rgimad | 461 | ;* READING A DATA SECTOR * |
462 | ;* Parameters are passed through global variables: * |
||
463 | ;* FDD_Track - track number (0-79); * |
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464 | ;* FDD_Head - head number (0-1); * |
||
465 | ;* FDD_Sector - sector number (1-18). * |
||
466 | ;* Result of operation is written to FDC_Status. * |
||
467 | ;* If the read operation is successful, the contents * |
||
468 | ;* of the sector will be written to FDD_DataBuffer. * |
||
2288 | clevermous | 469 | ;******************************************************* |
470 | ReadSector: |
||
4273 | clevermous | 471 | ; dbgstr 'ReadSector' |
2288 | clevermous | 472 | pushad |
473 | call save_timer_fdd_motor |
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8054 | rgimad | 474 | ; Clear the interrupt flag |
4115 | mario79 | 475 | mov [FDD_IntFlag], 0 |
8054 | rgimad | 476 | ; Set transmit speed to 500 Kb / s |
2288 | clevermous | 477 | mov AX, 0 |
478 | mov DX, 03F7h |
||
479 | out DX, AL |
||
8054 | rgimad | 480 | ; Initialize the DMA channel |
2288 | clevermous | 481 | mov [dmamode], 0x46 |
482 | call Init_FDC_DMA |
||
8054 | rgimad | 483 | ; Send "Data read" command |
484 | mov AL, 0E6h ; reading in multi-track mode |
||
2288 | clevermous | 485 | call FDCDataOutput |
486 | mov AL, [FDD_Head] |
||
487 | shl AL, 2 |
||
6814 | dunkaist | 488 | or AL, [flp_number] |
489 | dec AL |
||
2288 | clevermous | 490 | call FDCDataOutput |
491 | mov AL, [FDD_Track] |
||
492 | call FDCDataOutput |
||
493 | mov AL, [FDD_Head] |
||
494 | call FDCDataOutput |
||
495 | mov AL, [FDD_Sector] |
||
496 | call FDCDataOutput |
||
8054 | rgimad | 497 | mov AL, 2 ; sector size code (512 byte) |
2288 | clevermous | 498 | call FDCDataOutput |
8054 | rgimad | 499 | mov AL, 18 ;+1; 3Fh ;number of sectors per track |
2288 | clevermous | 500 | call FDCDataOutput |
8054 | rgimad | 501 | mov AL, 1Bh ; GPL value |
2288 | clevermous | 502 | call FDCDataOutput |
8054 | rgimad | 503 | mov AL, 0FFh; DTL value |
2288 | clevermous | 504 | call FDCDataOutput |
8054 | rgimad | 505 | ; Waiting for an interrupt at the end of the operation |
2288 | clevermous | 506 | call WaitFDCInterrupt |
507 | cmp [FDC_Status], FDC_Normal |
||
508 | jne @@Exit_1 |
||
8054 | rgimad | 509 | ; Read the operation completion status |
2288 | clevermous | 510 | call GetStatusInfo |
511 | test [FDC_ST0], 11011000b |
||
512 | jnz @@Err_1 |
||
4273 | clevermous | 513 | ; dbgstr 'ReadSector: FDC_Normal' |
2288 | clevermous | 514 | mov [FDC_Status], FDC_Normal |
515 | jmp @@Exit_1 |
||
516 | @@Err_1: |
||
4273 | clevermous | 517 | ; dbgstr 'ReadSector: FDC_SectorNotFound' |
2288 | clevermous | 518 | mov [FDC_Status], FDC_SectorNotFound |
519 | @@Exit_1: |
||
520 | call save_timer_fdd_motor |
||
521 | popad |
||
522 | ret |
||
523 | |||
524 | ;******************************************************* |
||
8054 | rgimad | 525 | ;* READ SECTOR (WITH RETRY OF OPERATION ON FAILURE) * |
526 | ;* Parameters are passed through global variables: * |
||
527 | ;* FDD_Track - track number (0-79); * |
||
528 | ;* FDD_Head - head number (0-1); * |
||
529 | ;* FDD_Sector - sector number (1-18). * |
||
530 | ;* Result of operation is written to FDC_Status. * |
||
531 | ;* If the read operation is successful, the contents * |
||
532 | ;* of the sector will be written to FDD_DataBuffer. * |
||
2288 | clevermous | 533 | ;******************************************************* |
534 | ReadSectWithRetr: |
||
535 | pusha |
||
8054 | rgimad | 536 | ; Reset the recalibration repetition counter |
2288 | clevermous | 537 | mov [RecalRepCounter], 0 |
538 | @@TryAgain: |
||
8054 | rgimad | 539 | ; Reset the read operation retry counter |
2288 | clevermous | 540 | mov [ReadRepCounter], 0 |
541 | @@ReadSector_1: |
||
542 | call ReadSector |
||
543 | cmp [FDC_Status], 0 |
||
544 | je @@Exit_2 |
||
545 | cmp [FDC_Status], 1 |
||
546 | je @@Err_3 |
||
8054 | rgimad | 547 | ; Three times repeat reading |
2288 | clevermous | 548 | inc [ReadRepCounter] |
549 | cmp [ReadRepCounter], 3 |
||
550 | jb @@ReadSector_1 |
||
8054 | rgimad | 551 | ; Three times repeat recalibration |
2288 | clevermous | 552 | call RecalibrateFDD |
553 | call SeekTrack |
||
554 | inc [RecalRepCounter] |
||
555 | cmp [RecalRepCounter], 3 |
||
556 | jb @@TryAgain |
||
557 | @@Exit_2: |
||
558 | popa |
||
559 | ret |
||
560 | @@Err_3: |
||
561 | popa |
||
562 | ret |
||
563 | |||
564 | ;******************************************************* |
||
8054 | rgimad | 565 | ;* WRITE DATA SECTOR * |
566 | ;* Parameters are passed through global variables: * |
||
567 | ;* FDD_Track - track number (0-79); * |
||
568 | ;* FDD_Head - head number (0-1); * |
||
569 | ;* FDD_Sector - sector number (1-18). * |
||
570 | ;* Result of operation is written to FDC_Status. * |
||
571 | ;* If the write operation is successful, the contents * |
||
572 | ;* of FDD_DataBuffer will be written to the sector * |
||
2288 | clevermous | 573 | ;******************************************************* |
574 | WriteSector: |
||
4273 | clevermous | 575 | ; dbgstr 'WriteSector' |
2288 | clevermous | 576 | pushad |
577 | call save_timer_fdd_motor |
||
8054 | rgimad | 578 | ; Clear the interrupt flag |
4115 | mario79 | 579 | mov [FDD_IntFlag], 0 |
8054 | rgimad | 580 | ; Set transmit speed to 500 Kb / s |
2288 | clevermous | 581 | mov AX, 0 |
582 | mov DX, 03F7h |
||
583 | out DX, AL |
||
8054 | rgimad | 584 | ; Initialize the DMA channel |
2288 | clevermous | 585 | mov [dmamode], 0x4A |
586 | call Init_FDC_DMA |
||
8054 | rgimad | 587 | ; Send "Write data" command |
588 | mov AL, 0xC5 ;0x45 ; write in multi-track mode |
||
2288 | clevermous | 589 | call FDCDataOutput |
590 | mov AL, [FDD_Head] |
||
591 | shl AL, 2 |
||
6814 | dunkaist | 592 | or AL, [flp_number] |
593 | dec AL |
||
2288 | clevermous | 594 | call FDCDataOutput |
595 | mov AL, [FDD_Track] |
||
596 | call FDCDataOutput |
||
597 | mov AL, [FDD_Head] |
||
598 | call FDCDataOutput |
||
599 | mov AL, [FDD_Sector] |
||
600 | call FDCDataOutput |
||
8054 | rgimad | 601 | mov AL, 2 ; sector size code (512 bytes) |
2288 | clevermous | 602 | call FDCDataOutput |
8054 | rgimad | 603 | mov AL, 18; 3Fh ; sectors per track |
2288 | clevermous | 604 | call FDCDataOutput |
8054 | rgimad | 605 | mov AL, 1Bh ; GPL value |
2288 | clevermous | 606 | call FDCDataOutput |
8054 | rgimad | 607 | mov AL, 0FFh; DTL value |
2288 | clevermous | 608 | call FDCDataOutput |
8054 | rgimad | 609 | ; Waiting for an interrupt at the end of the operation |
2288 | clevermous | 610 | call WaitFDCInterrupt |
611 | cmp [FDC_Status], FDC_Normal |
||
612 | jne @@Exit_3 |
||
8054 | rgimad | 613 | ; Reading the completion status of the operation |
2288 | clevermous | 614 | call GetStatusInfo |
615 | test [FDC_ST0], 11000000b ;11011000b |
||
616 | jnz @@Err_2 |
||
617 | mov [FDC_Status], FDC_Normal |
||
618 | jmp @@Exit_3 |
||
619 | @@Err_2: |
||
620 | mov [FDC_Status], FDC_SectorNotFound |
||
621 | @@Exit_3: |
||
622 | call save_timer_fdd_motor |
||
623 | popad |
||
624 | ret |
||
625 | |||
626 | ;******************************************************* |
||
8054 | rgimad | 627 | ;* WRITE SECTOR (WITH REPEAT ON FAILURE) * |
628 | ;* Parameters are passed through global variables: * |
||
629 | ;* FDD_Track - track number (0-79); * |
||
630 | ;* FDD_Head - head number (0-1); * |
||
631 | ;* FDD_Sector - sector number (1-18). * |
||
632 | ;* Result of operation is written to FDC_Status. * |
||
633 | ;* If the write operation is successful, the contents * |
||
634 | ;* of FDD_DataBuffer will be written to the sector * |
||
2288 | clevermous | 635 | ;******************************************************* |
636 | WriteSectWithRetr: |
||
637 | pusha |
||
8054 | rgimad | 638 | ; Reset the recalibration repetition counter |
2288 | clevermous | 639 | mov [RecalRepCounter], 0 |
640 | @@TryAgain_1: |
||
8054 | rgimad | 641 | ; Reset the read operation retry counter |
2288 | clevermous | 642 | mov [ReadRepCounter], 0 |
643 | @@WriteSector_1: |
||
644 | call WriteSector |
||
645 | cmp [FDC_Status], 0 |
||
646 | je @@Exit_4 |
||
647 | cmp [FDC_Status], 1 |
||
648 | je @@Err_4 |
||
8054 | rgimad | 649 | ; Three times repeat writing |
2288 | clevermous | 650 | inc [ReadRepCounter] |
651 | cmp [ReadRepCounter], 3 |
||
652 | jb @@WriteSector_1 |
||
8054 | rgimad | 653 | ; Three times repeat recalibration |
2288 | clevermous | 654 | call RecalibrateFDD |
655 | call SeekTrack |
||
656 | inc [RecalRepCounter] |
||
657 | cmp [RecalRepCounter], 3 |
||
658 | jb @@TryAgain_1 |
||
659 | @@Exit_4: |
||
660 | popa |
||
661 | ret |
||
662 | @@Err_4: |
||
663 | popa |
||
664 | ret |
||
665 | |||
666 | ;********************************************* |
||
8054 | rgimad | 667 | ;* GET INFORMATION ABOUT THE RESULT OF THE OPERATION |
2288 | clevermous | 668 | ;********************************************* |
669 | GetStatusInfo: |
||
670 | push AX |
||
671 | call FDCDataInput |
||
672 | mov [FDC_ST0], AL |
||
673 | call FDCDataInput |
||
674 | mov [FDC_ST1], AL |
||
675 | call FDCDataInput |
||
676 | mov [FDC_ST2], AL |
||
677 | call FDCDataInput |
||
678 | mov [FDC_C], AL |
||
679 | call FDCDataInput |
||
680 | mov [FDC_H], AL |
||
681 | call FDCDataInput |
||
682 | mov [FDC_R], AL |
||
683 | call FDCDataInput |
||
684 | mov [FDC_N], AL |
||
685 | pop AX |
||
686 | ret |
||
687 | |||
4273 | clevermous | 688 | ; Interface for disk subsystem. |
689 | ; Assume fixed capacity for 1.44M. |
||
690 | FLOPPY_CAPACITY = 2880 ; in sectors |
||
691 | |||
692 | iglobal |
||
693 | align 4 |
||
694 | floppy_functions: |
||
695 | dd .size |
||
696 | dd 0 ; no close() function |
||
697 | dd 0 ; no closemedia() function |
||
698 | dd floppy_querymedia |
||
699 | dd floppy_read |
||
700 | dd floppy_write |
||
701 | dd 0 ; no flush() function |
||
702 | dd 0 ; no adjust_cache_size() function |
||
703 | .size = $ - floppy_functions |
||
704 | endg |
||
705 | |||
706 | uglobal |
||
707 | floppy_media_flags rb 2 |
||
708 | n_sector dd 0 ; temporary save for sector value |
||
709 | flp_number db 0 ; 1- Floppy A, 2-Floppy B |
||
710 | old_track db 0 ; old value track |
||
711 | flp_label rb 15*2 ; Label and ID of inserted floppy disk |
||
712 | align 4 |
||
713 | ; Hardware does not allow to work with two floppies in parallel, |
||
714 | ; so there is one mutex guarding access to any floppy. |
||
715 | floppy_mutex MUTEX |
||
716 | endg |
||
717 | ; Meaning of bits in floppy_media_flags |
||
718 | FLOPPY_MEDIA_PRESENT = 1 ; media was present when last asked |
||
719 | FLOPPY_MEDIA_NEED_RESCAN = 2 ; media was possibly changed, need to rescan |
||
720 | FLOPPY_MEDIA_LABEL_CHANGED = 4 ; temporary state |
||
721 | |||
722 | iglobal |
||
723 | floppy1_name db 'fd',0 |
||
724 | floppy2_name db 'fd2',0 |
||
725 | endg |
||
726 | |||
727 | ; This function is called in boot process. |
||
728 | ; It creates filesystems /fd and/or /fd2, if the system has one/two floppy drives. |
||
729 | proc floppy_init |
||
730 | mov ecx, floppy_mutex |
||
731 | call mutex_init |
||
732 | ; First floppy is present if [DRIVE_DATA] and 0xF0 is nonzero. |
||
733 | test byte [DRIVE_DATA], 0xF0 |
||
734 | jz .no1 |
||
735 | stdcall disk_add, floppy_functions, floppy1_name, 1, DISK_NO_INSERT_NOTIFICATION |
||
736 | .no1: |
||
737 | ; Second floppy is present if [DRIVE_DATA] and 0x0F is nonzero. |
||
738 | test byte [DRIVE_DATA], 0x0F |
||
739 | jz .no2 |
||
740 | stdcall disk_add, floppy_functions, floppy2_name, 2, DISK_NO_INSERT_NOTIFICATION |
||
741 | .no2: |
||
742 | ret |
||
743 | endp |
||
744 | |||
745 | ; Returns information about disk media. |
||
746 | ; Floppy drives do not support insert notifications, |
||
747 | ; DISK_NO_INSERT_NOTIFICATION is set, |
||
748 | ; the disk subsystem calls this function before each filesystem operation. |
||
749 | ; If the media has changed, return error for the first call as signal |
||
750 | ; to finalize work with old media and the true geometry for the second call. |
||
751 | ; Assume that media is (possibly) changed anytime when motor is off. |
||
752 | proc floppy_querymedia |
||
753 | virtual at esp+4 |
||
754 | .userdata dd ? |
||
755 | .info dd ? |
||
756 | end virtual |
||
757 | ; 1. Acquire the global lock. |
||
758 | mov ecx, floppy_mutex |
||
759 | call mutex_lock |
||
760 | mov edx, [.userdata] ; 1 for /fd, 2 for /fd2 |
||
761 | ; 2. If the media was reported and has been changed, forget it and report an error. |
||
762 | mov al, [floppy_media_flags+edx-1] |
||
763 | and al, FLOPPY_MEDIA_PRESENT + FLOPPY_MEDIA_NEED_RESCAN |
||
764 | cmp al, FLOPPY_MEDIA_PRESENT + FLOPPY_MEDIA_NEED_RESCAN |
||
765 | jnz .not_reported |
||
766 | .no_media: |
||
767 | mov [floppy_media_flags+edx-1], 0 |
||
768 | .return_no_media: |
||
769 | mov ecx, floppy_mutex |
||
770 | call mutex_unlock |
||
771 | mov eax, DISK_STATUS_NO_MEDIA |
||
772 | retn 8 |
||
773 | .not_reported: |
||
774 | ; 3. If we are in the temporary state LABEL_CHANGED, this is the second call |
||
775 | ; after intermediate DISK_STATUS_NO_MEDIA due to media change; |
||
776 | ; clear the flag and return the current geometry without rereading the bootsector. |
||
777 | cmp [floppy_media_flags+edx-1], FLOPPY_MEDIA_LABEL_CHANGED |
||
778 | jz .report_geometry |
||
779 | ; 4. Try to read the bootsector. |
||
780 | mov [flp_number], dl |
||
781 | mov [FDC_Status], 0 |
||
782 | call floppy_read_bootsector |
||
783 | ; 5. If reading bootsector failed, assume that media is not present. |
||
784 | mov edx, [.userdata] |
||
785 | cmp [FDC_Status], 0 |
||
786 | jnz .no_media |
||
787 | ; 6. Check whether the previous status is "present". If not, go to 10. |
||
788 | push esi edi |
||
789 | imul edi, edx, 15 |
||
790 | add edi, flp_label-15 |
||
791 | mov esi, FDD_BUFF+39 |
||
792 | mov ecx, 15 |
||
793 | test [floppy_media_flags+edx-1], FLOPPY_MEDIA_PRESENT |
||
794 | jz .set_label |
||
795 | ; 7. Compare the old label with the current one. |
||
796 | rep cmpsb |
||
797 | ; 8. If the label has not changed, go to 11. |
||
798 | jz .ok |
||
799 | ; 9. If the label has changed, store it, enter temporary state LABEL_CHANGED |
||
800 | ; and report DISK_STATUS_NO_MEDIA. |
||
801 | ; dbgstr 'floppy label changed' |
||
802 | add esi, ecx |
||
803 | add edi, ecx |
||
804 | mov ecx, 15 |
||
805 | sub esi, ecx |
||
806 | sub edi, ecx |
||
807 | rep movsb |
||
808 | mov [floppy_media_flags+edx-1], FLOPPY_MEDIA_LABEL_CHANGED |
||
809 | pop edi esi |
||
810 | jmp .return_no_media |
||
811 | .set_label: |
||
812 | ; 10. The previous state was "not present". Copy the label. |
||
813 | rep movsb |
||
814 | .ok: |
||
815 | pop edi esi |
||
816 | .report_geometry: |
||
817 | ; 11. Fill DISKMEDIAINFO structure. |
||
818 | mov ecx, [.info] |
||
819 | and [ecx+DISKMEDIAINFO.Flags], 0 |
||
820 | mov [ecx+DISKMEDIAINFO.SectorSize], 512 |
||
821 | mov dword [ecx+DISKMEDIAINFO.Capacity], FLOPPY_CAPACITY |
||
822 | and dword [ecx+DISKMEDIAINFO.Capacity+4], 0 |
||
823 | ; 12. Update state: media is present, data are actual. |
||
824 | mov [floppy_media_flags+edx-1], FLOPPY_MEDIA_PRESENT |
||
825 | ; 13. Release the global lock and return successful status. |
||
826 | mov ecx, floppy_mutex |
||
827 | call mutex_unlock |
||
828 | xor eax, eax |
||
829 | retn 8 |
||
830 | endp |
||
831 | |||
832 | proc floppy_read_bootsector |
||
833 | pushad |
||
8054 | rgimad | 834 | mov [FDD_Track], 0 ; Cylinder |
835 | mov [FDD_Head], 0 ; Head |
||
836 | mov [FDD_Sector], 1 ; Sector |
||
4273 | clevermous | 837 | call FDDMotorON |
838 | call RecalibrateFDD |
||
839 | cmp [FDC_Status], 0 |
||
840 | jne .nothing |
||
841 | call SeekTrack |
||
842 | cmp [FDC_Status], 0 |
||
843 | jne .nothing |
||
844 | call ReadSectWithRetr |
||
845 | .nothing: |
||
846 | popad |
||
847 | ret |
||
848 | endp |
||
849 | |||
850 | read_chs_sector: |
||
851 | call calculate_chs |
||
852 | call ReadSectWithRetr |
||
853 | ret |
||
854 | |||
855 | save_chs_sector: |
||
856 | call calculate_chs |
||
857 | call WriteSectWithRetr |
||
858 | ret |
||
859 | |||
860 | calculate_chs: |
||
861 | mov bl, [FDD_Track] |
||
862 | mov [old_track], bl |
||
863 | mov ebx, 18 |
||
864 | xor edx, edx |
||
865 | div ebx |
||
866 | inc edx |
||
867 | mov [FDD_Sector], dl |
||
868 | mov edx, eax |
||
869 | shr eax, 1 |
||
870 | and edx, 1 |
||
871 | mov [FDD_Track], al |
||
872 | mov [FDD_Head], dl |
||
873 | mov dl, [old_track] |
||
874 | cmp dl, [FDD_Track] |
||
875 | je no_seek_track_1 |
||
876 | call SeekTrack |
||
877 | no_seek_track_1: |
||
878 | ret |
||
879 | |||
880 | ; Writes one or more sectors to the device. |
||
881 | proc floppy_write |
||
882 | mov dl, 1 |
||
883 | jmp floppy_read_write |
||
884 | endp |
||
885 | |||
886 | ; Reads one or more sectors from the device. |
||
887 | proc floppy_read |
||
888 | mov dl, 0 |
||
889 | endp |
||
890 | |||
891 | ; Common part of floppy_read and floppy_write. |
||
892 | proc floppy_read_write userdata:dword, buffer:dword, start_sector:qword, numsectors_ptr:dword |
||
893 | virtual at ebp-8 |
||
894 | .sectors_todo dd ? |
||
895 | .operation db ? |
||
896 | end virtual |
||
897 | push edx ; save operation code to [.operation] |
||
898 | ; 1. Get number of sectors to read/write |
||
899 | ; and zero number of sectors that were actually read/written. |
||
900 | mov eax, [numsectors_ptr] |
||
901 | push dword [eax] ; initialize [.sectors_todo] |
||
902 | and dword [eax], 0 |
||
903 | push ebx esi edi ; save used registers to be stdcall |
||
904 | ; 2. Acquire the global lock. |
||
905 | mov ecx, floppy_mutex |
||
906 | call mutex_lock |
||
907 | ; 3. Set floppy number for this operation. |
||
908 | mov edx, [userdata] |
||
909 | mov [flp_number], dl |
||
910 | ; 4. Read/write sector-by-sector. |
||
911 | .operation_loop: |
||
912 | ; 4a. Check that the sector is inside the media. |
||
913 | cmp dword [start_sector+4], 0 |
||
914 | jnz .end_of_media |
||
915 | mov eax, dword [start_sector] |
||
916 | cmp eax, FLOPPY_CAPACITY |
||
917 | jae .end_of_media |
||
918 | ; 4b. For read operation, call read_chs_sector and then move data from FDD_BUFF to [buffer]. |
||
919 | ; For write operation, move data from [buffer] to FDD_BUFF and then call save_chs_sector. |
||
920 | cmp [.operation], 0 |
||
921 | jz .read |
||
922 | mov esi, [buffer] |
||
923 | mov edi, FDD_BUFF |
||
924 | mov ecx, 512/4 |
||
925 | rep movsd |
||
926 | mov [buffer], esi |
||
927 | call save_chs_sector |
||
928 | jmp @f |
||
929 | .read: |
||
930 | call read_chs_sector |
||
931 | mov esi, FDD_BUFF |
||
932 | mov edi, [buffer] |
||
933 | mov ecx, 512/4 |
||
934 | rep movsd |
||
935 | mov [buffer], edi |
||
936 | @@: |
||
937 | ; 4c. If there was an error, propagate it to the caller. |
||
938 | cmp [FDC_Status], 0 |
||
939 | jnz .fail |
||
940 | ; 4d. Otherwise, increment number of sectors processed and continue the loop. |
||
941 | mov eax, [numsectors_ptr] |
||
942 | inc dword [eax] |
||
943 | inc dword [start_sector] |
||
944 | dec [.sectors_todo] |
||
945 | jnz .operation_loop |
||
946 | ; 5. Release the global lock and return with the correct status. |
||
947 | push 0 |
||
948 | .return: |
||
949 | mov ecx, floppy_mutex |
||
950 | call mutex_unlock |
||
951 | pop eax |
||
952 | pop edi esi ebx ; restore used registers to be stdcall |
||
953 | ret ; this translates to leave/retn N and purges local variables |
||
954 | .fail: |
||
955 | push -1 |
||
956 | jmp .return |
||
957 | .end_of_media: |
||
958 | push DISK_STATUS_END_OF_MEDIA |
||
959 | jmp .return |
||
960 | endp |