Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 1 | // 16bit code to access floppy drives. |
| 2 | // |
| 3 | // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net> |
| 4 | // Copyright (C) 2002 MandrakeSoft S.A. |
| 5 | // |
| 6 | // This file may be distributed under the terms of the GNU GPLv3 license. |
| 7 | |
| 8 | #include "types.h" // u8 |
| 9 | #include "disk.h" // DISK_RET_SUCCESS |
| 10 | #include "config.h" // CONFIG_FLOPPY_SUPPORT |
Kevin O'Connor | 9521e26 | 2008-07-04 13:04:29 -0400 | [diff] [blame] | 11 | #include "biosvar.h" // SET_BDA |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 12 | #include "util.h" // irq_disable |
| 13 | #include "cmos.h" // inb_cmos |
Kevin O'Connor | d21c089 | 2008-11-26 17:02:43 -0500 | [diff] [blame] | 14 | #include "pic.h" // eoi_pic1 |
Kevin O'Connor | 9521e26 | 2008-07-04 13:04:29 -0400 | [diff] [blame] | 15 | #include "bregs.h" // struct bregs |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 16 | |
| 17 | #define BX_FLOPPY_ON_CNT 37 /* 2 seconds */ |
| 18 | |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 19 | // New diskette parameter table adding 3 parameters from IBM |
| 20 | // Since no provisions are made for multiple drive types, most |
| 21 | // values in this table are ignored. I set parameters for 1.44M |
| 22 | // floppy here |
Kevin O'Connor | 4a754b3 | 2008-12-28 21:37:27 -0500 | [diff] [blame^] | 23 | struct floppy_ext_dbt_s diskette_param_table2 VAR16 = { |
Kevin O'Connor | 44c631d | 2008-03-02 11:24:36 -0500 | [diff] [blame] | 24 | .dbt = { |
| 25 | .specify1 = 0xAF, |
| 26 | .specify2 = 0x02, // head load time 0000001, DMA used |
| 27 | .shutoff_ticks = 0x25, |
| 28 | .bps_code = 0x02, |
| 29 | .sectors = 18, |
| 30 | .interblock_len = 0x1B, |
| 31 | .data_len = 0xFF, |
| 32 | .gap_len = 0x6C, |
| 33 | .fill_byte = 0xF6, |
| 34 | .settle_time = 0x0F, |
| 35 | .startup_time = 0x08, |
| 36 | }, |
| 37 | .max_track = 79, // maximum track |
| 38 | .data_rate = 0, // data transfer rate |
| 39 | .drive_type = 4, // drive type in cmos |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 40 | }; |
| 41 | |
Kevin O'Connor | 3bbcc14 | 2008-04-13 17:07:33 -0400 | [diff] [blame] | 42 | void |
| 43 | floppy_drive_setup() |
| 44 | { |
Kevin O'Connor | f54c150 | 2008-06-14 15:56:16 -0400 | [diff] [blame] | 45 | if (! CONFIG_FLOPPY_SUPPORT) |
| 46 | return; |
Kevin O'Connor | 35192dd | 2008-06-08 19:18:33 -0400 | [diff] [blame] | 47 | dprintf(3, "init floppy drives\n"); |
Kevin O'Connor | 020c476 | 2008-08-17 11:30:07 -0400 | [diff] [blame] | 48 | if (CONFIG_COREBOOT) |
| 49 | // XXX - disable floppies on coreboot for now. |
| 50 | outb_cmos(0, CMOS_FLOPPY_DRIVE_TYPE); |
Kevin O'Connor | 3bbcc14 | 2008-04-13 17:07:33 -0400 | [diff] [blame] | 51 | u8 type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE); |
| 52 | u8 out = 0; |
Kevin O'Connor | 88c00ee | 2008-05-18 00:14:13 -0400 | [diff] [blame] | 53 | u8 num_floppies = 0; |
| 54 | |
| 55 | if (type & 0xf0) { |
Kevin O'Connor | 3bbcc14 | 2008-04-13 17:07:33 -0400 | [diff] [blame] | 56 | out |= 0x07; |
Kevin O'Connor | 88c00ee | 2008-05-18 00:14:13 -0400 | [diff] [blame] | 57 | num_floppies++; |
| 58 | } |
| 59 | if (type & 0x0f) { |
Kevin O'Connor | 3bbcc14 | 2008-04-13 17:07:33 -0400 | [diff] [blame] | 60 | out |= 0x70; |
Kevin O'Connor | 88c00ee | 2008-05-18 00:14:13 -0400 | [diff] [blame] | 61 | num_floppies++; |
| 62 | } |
Kevin O'Connor | 3bbcc14 | 2008-04-13 17:07:33 -0400 | [diff] [blame] | 63 | SET_BDA(floppy_harddisk_info, out); |
Kevin O'Connor | 88c00ee | 2008-05-18 00:14:13 -0400 | [diff] [blame] | 64 | |
| 65 | // Update equipment word bits for floppy |
| 66 | if (num_floppies == 1) |
| 67 | // 1 drive, ready for boot |
| 68 | SETBITS_BDA(equipment_list_flags, 0x01); |
| 69 | else if (num_floppies == 2) |
| 70 | // 2 drives, ready for boot |
| 71 | SETBITS_BDA(equipment_list_flags, 0x41); |
| 72 | |
Kevin O'Connor | 3bbcc14 | 2008-04-13 17:07:33 -0400 | [diff] [blame] | 73 | outb(0x02, PORT_DMA1_MASK_REG); |
Kevin O'Connor | f54c150 | 2008-06-14 15:56:16 -0400 | [diff] [blame] | 74 | |
Kevin O'Connor | d21c089 | 2008-11-26 17:02:43 -0500 | [diff] [blame] | 75 | enable_hwirq(6, entry_0e); |
Kevin O'Connor | 3bbcc14 | 2008-04-13 17:07:33 -0400 | [diff] [blame] | 76 | } |
| 77 | |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 78 | static inline void |
| 79 | set_diskette_current_cyl(u8 drive, u8 cyl) |
| 80 | { |
| 81 | if (drive) |
| 82 | SET_BDA(floppy_track1, cyl); |
| 83 | else |
| 84 | SET_BDA(floppy_track0, cyl); |
| 85 | } |
| 86 | |
| 87 | static u16 |
| 88 | get_drive_type(u8 drive) |
| 89 | { |
| 90 | // check CMOS to see if drive exists |
| 91 | u8 drive_type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE); |
| 92 | if (drive == 0) |
| 93 | drive_type >>= 4; |
| 94 | else |
| 95 | drive_type &= 0x0f; |
| 96 | return drive_type; |
| 97 | } |
| 98 | |
| 99 | static u16 |
| 100 | floppy_media_known(u8 drive) |
| 101 | { |
| 102 | if (!(GET_BDA(floppy_recalibration_status) & (1<<drive))) |
| 103 | return 0; |
| 104 | u8 v = GET_BDA(floppy_media_state[drive]); |
| 105 | if (!(v & FMS_MEDIA_DRIVE_ESTABLISHED)) |
| 106 | return 0; |
| 107 | return 1; |
| 108 | } |
| 109 | |
| 110 | static void |
| 111 | floppy_reset_controller() |
| 112 | { |
| 113 | // Reset controller |
| 114 | u8 val8 = inb(PORT_FD_DOR); |
| 115 | outb(val8 & ~0x04, PORT_FD_DOR); |
| 116 | outb(val8 | 0x04, PORT_FD_DOR); |
| 117 | |
| 118 | // Wait for controller to come out of reset |
| 119 | while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80) |
| 120 | ; |
| 121 | } |
| 122 | |
| 123 | static void |
| 124 | floppy_prepare_controller(u8 drive) |
| 125 | { |
| 126 | CLEARBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT); |
| 127 | |
| 128 | // turn on motor of selected drive, DMA & int enabled, normal operation |
| 129 | u8 prev_reset = inb(PORT_FD_DOR) & 0x04; |
| 130 | u8 dor = 0x10; |
| 131 | if (drive) |
| 132 | dor = 0x20; |
| 133 | dor |= 0x0c; |
| 134 | dor |= drive; |
| 135 | outb(dor, PORT_FD_DOR); |
| 136 | |
| 137 | // reset the disk motor timeout value of INT 08 |
| 138 | SET_BDA(floppy_motor_counter, BX_FLOPPY_ON_CNT); |
| 139 | |
| 140 | // wait for drive readiness |
| 141 | while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80) |
| 142 | ; |
| 143 | |
| 144 | if (prev_reset == 0) { |
| 145 | irq_enable(); |
| 146 | u8 v; |
Kevin O'Connor | 06ad44e | 2008-04-05 19:30:02 -0400 | [diff] [blame] | 147 | for (;;) { |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 148 | v = GET_BDA(floppy_recalibration_status); |
Kevin O'Connor | 06ad44e | 2008-04-05 19:30:02 -0400 | [diff] [blame] | 149 | if (v & FRS_TIMEOUT) |
| 150 | break; |
| 151 | cpu_relax(); |
| 152 | } |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 153 | irq_disable(); |
| 154 | |
| 155 | v &= ~FRS_TIMEOUT; |
| 156 | SET_BDA(floppy_recalibration_status, v); |
| 157 | } |
| 158 | } |
| 159 | |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 160 | static int |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 161 | floppy_pio(u8 *cmd, u8 cmdlen) |
| 162 | { |
| 163 | floppy_prepare_controller(cmd[1] & 1); |
| 164 | |
| 165 | // send command to controller |
| 166 | u8 i; |
| 167 | for (i=0; i<cmdlen; i++) |
| 168 | outb(cmd[i], PORT_FD_DATA); |
| 169 | |
| 170 | irq_enable(); |
| 171 | u8 v; |
Kevin O'Connor | 06ad44e | 2008-04-05 19:30:02 -0400 | [diff] [blame] | 172 | for (;;) { |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 173 | if (!GET_BDA(floppy_motor_counter)) { |
| 174 | irq_disable(); |
| 175 | floppy_reset_controller(); |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 176 | return -1; |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 177 | } |
| 178 | v = GET_BDA(floppy_recalibration_status); |
Kevin O'Connor | 06ad44e | 2008-04-05 19:30:02 -0400 | [diff] [blame] | 179 | if (v & FRS_TIMEOUT) |
| 180 | break; |
| 181 | cpu_relax(); |
| 182 | } |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 183 | irq_disable(); |
| 184 | |
| 185 | v &= ~FRS_TIMEOUT; |
| 186 | SET_BDA(floppy_recalibration_status, v); |
| 187 | |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 188 | return 0; |
| 189 | } |
| 190 | |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 191 | #define floppy_ret(regs, code) \ |
| 192 | __floppy_ret(__func__, __LINE__, (regs), (code)) |
| 193 | |
| 194 | void |
| 195 | __floppy_ret(const char *fname, int lineno, struct bregs *regs, u8 code) |
| 196 | { |
| 197 | SET_BDA(floppy_last_status, code); |
| 198 | if (code) |
| 199 | __set_code_fail(fname, lineno, regs, code); |
| 200 | else |
| 201 | set_code_success(regs); |
| 202 | } |
| 203 | |
| 204 | static int |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 205 | floppy_cmd(struct bregs *regs, u16 count, u8 *cmd, u8 cmdlen) |
| 206 | { |
| 207 | // es:bx = pointer to where to place information from diskette |
Kevin O'Connor | e10d345 | 2008-07-09 22:45:12 -0400 | [diff] [blame] | 208 | u32 addr = (u32)MAKE_FARPTR(regs->es, regs->bx); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 209 | |
| 210 | // check for 64K boundary overrun |
Kevin O'Connor | e10d345 | 2008-07-09 22:45:12 -0400 | [diff] [blame] | 211 | u32 last_addr = addr + count; |
| 212 | if ((addr >> 16) != (last_addr >> 16)) { |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 213 | floppy_ret(regs, DISK_RET_EBOUNDARY); |
| 214 | return -1; |
| 215 | } |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 216 | |
| 217 | u8 mode_register = 0x4a; // single mode, increment, autoinit disable, |
| 218 | if (cmd[0] == 0xe6) |
| 219 | // read |
| 220 | mode_register = 0x46; |
| 221 | |
Kevin O'Connor | 44c631d | 2008-03-02 11:24:36 -0500 | [diff] [blame] | 222 | //DEBUGF("floppy dma c2\n"); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 223 | outb(0x06, PORT_DMA1_MASK_REG); |
| 224 | outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop |
Kevin O'Connor | e10d345 | 2008-07-09 22:45:12 -0400 | [diff] [blame] | 225 | outb(addr, PORT_DMA_ADDR_2); |
| 226 | outb(addr>>8, PORT_DMA_ADDR_2); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 227 | outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop |
| 228 | outb(count, PORT_DMA_CNT_2); |
| 229 | outb(count>>8, PORT_DMA_CNT_2); |
| 230 | |
| 231 | // port 0b: DMA-1 Mode Register |
| 232 | // transfer type=write, channel 2 |
| 233 | outb(mode_register, PORT_DMA1_MODE_REG); |
| 234 | |
| 235 | // port 81: DMA-1 Page Register, channel 2 |
Kevin O'Connor | e10d345 | 2008-07-09 22:45:12 -0400 | [diff] [blame] | 236 | outb(addr>>16, PORT_DMA_PAGE_2); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 237 | |
| 238 | outb(0x02, PORT_DMA1_MASK_REG); // unmask channel 2 |
| 239 | |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 240 | int ret = floppy_pio(cmd, cmdlen); |
| 241 | if (ret) { |
| 242 | floppy_ret(regs, DISK_RET_ETIMEOUT); |
| 243 | return -1; |
| 244 | } |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 245 | |
Kevin O'Connor | c65a380 | 2008-03-02 13:58:23 -0500 | [diff] [blame] | 246 | // check port 3f4 for accessibility to status bytes |
| 247 | if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0) |
| 248 | BX_PANIC("int13_diskette: ctrl not ready\n"); |
| 249 | |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 250 | // read 7 return status bytes from controller |
| 251 | u8 i; |
| 252 | for (i=0; i<7; i++) { |
| 253 | u8 v = inb(PORT_FD_DATA); |
| 254 | cmd[i] = v; |
| 255 | SET_BDA(floppy_return_status[i], v); |
| 256 | } |
| 257 | |
| 258 | return 0; |
| 259 | } |
| 260 | |
| 261 | static void |
| 262 | floppy_drive_recal(u8 drive) |
| 263 | { |
| 264 | // send Recalibrate command (2 bytes) to controller |
| 265 | u8 data[12]; |
| 266 | data[0] = 0x07; // 07: Recalibrate |
| 267 | data[1] = drive; // 0=drive0, 1=drive1 |
| 268 | floppy_pio(data, 2); |
| 269 | |
| 270 | SETBITS_BDA(floppy_recalibration_status, 1<<drive); |
| 271 | set_diskette_current_cyl(drive, 0); |
| 272 | } |
| 273 | |
| 274 | static u16 |
| 275 | floppy_media_sense(u8 drive) |
| 276 | { |
| 277 | u16 rv; |
| 278 | u8 config_data, media_state; |
| 279 | |
| 280 | floppy_drive_recal(drive); |
| 281 | |
| 282 | // for now cheat and get drive type from CMOS, |
| 283 | // assume media is same as drive type |
| 284 | |
| 285 | // ** config_data ** |
| 286 | // Bitfields for diskette media control: |
| 287 | // Bit(s) Description (Table M0028) |
| 288 | // 7-6 last data rate set by controller |
| 289 | // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps |
| 290 | // 5-4 last diskette drive step rate selected |
| 291 | // 00=0Ch, 01=0Dh, 10=0Eh, 11=0Ah |
| 292 | // 3-2 {data rate at start of operation} |
| 293 | // 1-0 reserved |
| 294 | |
| 295 | // ** media_state ** |
| 296 | // Bitfields for diskette drive media state: |
| 297 | // Bit(s) Description (Table M0030) |
| 298 | // 7-6 data rate |
| 299 | // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps |
| 300 | // 5 double stepping required (e.g. 360kB in 1.2MB) |
| 301 | // 4 media type established |
| 302 | // 3 drive capable of supporting 4MB media |
| 303 | // 2-0 on exit from BIOS, contains |
| 304 | // 000 trying 360kB in 360kB |
| 305 | // 001 trying 360kB in 1.2MB |
| 306 | // 010 trying 1.2MB in 1.2MB |
| 307 | // 011 360kB in 360kB established |
| 308 | // 100 360kB in 1.2MB established |
| 309 | // 101 1.2MB in 1.2MB established |
| 310 | // 110 reserved |
| 311 | // 111 all other formats/drives |
| 312 | |
| 313 | switch (get_drive_type(drive)) { |
| 314 | case 1: |
| 315 | // 360K 5.25" drive |
| 316 | config_data = 0x00; // 0000 0000 |
| 317 | media_state = 0x25; // 0010 0101 |
| 318 | rv = 1; |
| 319 | break; |
| 320 | case 2: |
| 321 | // 1.2 MB 5.25" drive |
| 322 | config_data = 0x00; // 0000 0000 |
| 323 | media_state = 0x25; // 0010 0101 // need double stepping??? (bit 5) |
| 324 | rv = 1; |
| 325 | break; |
| 326 | case 3: |
| 327 | // 720K 3.5" drive |
| 328 | config_data = 0x00; // 0000 0000 ??? |
| 329 | media_state = 0x17; // 0001 0111 |
| 330 | rv = 1; |
| 331 | break; |
| 332 | case 4: |
| 333 | // 1.44 MB 3.5" drive |
| 334 | config_data = 0x00; // 0000 0000 |
| 335 | media_state = 0x17; // 0001 0111 |
| 336 | rv = 1; |
| 337 | break; |
| 338 | case 5: |
| 339 | // 2.88 MB 3.5" drive |
| 340 | config_data = 0xCC; // 1100 1100 |
| 341 | media_state = 0xD7; // 1101 0111 |
| 342 | rv = 1; |
| 343 | break; |
| 344 | // |
| 345 | // Extended floppy size uses special cmos setting |
| 346 | case 6: |
| 347 | // 160k 5.25" drive |
| 348 | config_data = 0x00; // 0000 0000 |
| 349 | media_state = 0x27; // 0010 0111 |
| 350 | rv = 1; |
| 351 | break; |
| 352 | case 7: |
| 353 | // 180k 5.25" drive |
| 354 | config_data = 0x00; // 0000 0000 |
| 355 | media_state = 0x27; // 0010 0111 |
| 356 | rv = 1; |
| 357 | break; |
| 358 | case 8: |
| 359 | // 320k 5.25" drive |
| 360 | config_data = 0x00; // 0000 0000 |
| 361 | media_state = 0x27; // 0010 0111 |
| 362 | rv = 1; |
| 363 | break; |
| 364 | default: |
| 365 | // not recognized |
| 366 | config_data = 0x00; // 0000 0000 |
| 367 | media_state = 0x00; // 0000 0000 |
| 368 | rv = 0; |
| 369 | } |
| 370 | |
| 371 | SET_BDA(floppy_last_data_rate, config_data); |
| 372 | SET_BDA(floppy_media_state[drive], media_state); |
| 373 | return rv; |
| 374 | } |
| 375 | |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 376 | static int |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 377 | check_drive(struct bregs *regs, u8 drive) |
| 378 | { |
| 379 | // see if drive exists |
| 380 | if (drive > 1 || !get_drive_type(drive)) { |
Kevin O'Connor | c65a380 | 2008-03-02 13:58:23 -0500 | [diff] [blame] | 381 | // XXX - return type doesn't match |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 382 | floppy_ret(regs, DISK_RET_ETIMEOUT); |
| 383 | return -1; |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 384 | } |
| 385 | |
| 386 | // see if media in drive, and type is known |
| 387 | if (floppy_media_known(drive) == 0 && floppy_media_sense(drive) == 0) { |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 388 | floppy_ret(regs, DISK_RET_EMEDIA); |
| 389 | return -1; |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 390 | } |
| 391 | return 0; |
| 392 | } |
| 393 | |
| 394 | // diskette controller reset |
| 395 | static void |
| 396 | floppy_1300(struct bregs *regs, u8 drive) |
| 397 | { |
| 398 | if (drive > 1) { |
| 399 | floppy_ret(regs, DISK_RET_EPARAM); |
| 400 | return; |
| 401 | } |
| 402 | if (!get_drive_type(drive)) { |
| 403 | floppy_ret(regs, DISK_RET_ETIMEOUT); |
| 404 | return; |
| 405 | } |
| 406 | set_diskette_current_cyl(drive, 0); // current cylinder |
| 407 | floppy_ret(regs, DISK_RET_SUCCESS); |
| 408 | } |
| 409 | |
| 410 | // Read Diskette Status |
| 411 | static void |
| 412 | floppy_1301(struct bregs *regs, u8 drive) |
| 413 | { |
| 414 | u8 v = GET_BDA(floppy_last_status); |
| 415 | regs->ah = v; |
| 416 | set_cf(regs, v); |
| 417 | } |
| 418 | |
| 419 | // Read Diskette Sectors |
| 420 | static void |
| 421 | floppy_1302(struct bregs *regs, u8 drive) |
| 422 | { |
| 423 | if (check_drive(regs, drive)) |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 424 | goto fail; |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 425 | |
| 426 | u8 num_sectors = regs->al; |
| 427 | u8 track = regs->ch; |
| 428 | u8 sector = regs->cl; |
| 429 | u8 head = regs->dh; |
| 430 | |
| 431 | if (head > 1 || sector == 0 || num_sectors == 0 |
| 432 | || track > 79 || num_sectors > 72) { |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 433 | floppy_ret(regs, DISK_RET_EPARAM); |
| 434 | goto fail; |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 435 | } |
| 436 | |
| 437 | // send read-normal-data command (9 bytes) to controller |
| 438 | u8 data[12]; |
| 439 | data[0] = 0xe6; // e6: read normal data |
| 440 | data[1] = (head << 2) | drive; // HD DR1 DR2 |
| 441 | data[2] = track; |
| 442 | data[3] = head; |
| 443 | data[4] = sector; |
| 444 | data[5] = 2; // 512 byte sector size |
| 445 | data[6] = sector + num_sectors - 1; // last sector to read on track |
| 446 | data[7] = 0; // Gap length |
| 447 | data[8] = 0xff; // Gap length |
| 448 | |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 449 | int ret = floppy_cmd(regs, (num_sectors * 512) - 1, data, 9); |
| 450 | if (ret) |
| 451 | goto fail; |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 452 | |
| 453 | if (data[0] & 0xc0) { |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 454 | floppy_ret(regs, DISK_RET_ECONTROLLER); |
| 455 | goto fail; |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 456 | } |
| 457 | |
| 458 | // ??? should track be new val from return_status[3] ? |
| 459 | set_diskette_current_cyl(drive, track); |
| 460 | // AL = number of sectors read (same value as passed) |
| 461 | floppy_ret(regs, DISK_RET_SUCCESS); |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 462 | return; |
| 463 | fail: |
| 464 | regs->al = 0; // no sectors read |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 465 | } |
| 466 | |
| 467 | // Write Diskette Sectors |
| 468 | static void |
| 469 | floppy_1303(struct bregs *regs, u8 drive) |
| 470 | { |
| 471 | if (check_drive(regs, drive)) |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 472 | goto fail; |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 473 | |
| 474 | u8 num_sectors = regs->al; |
| 475 | u8 track = regs->ch; |
| 476 | u8 sector = regs->cl; |
| 477 | u8 head = regs->dh; |
| 478 | |
| 479 | if (head > 1 || sector == 0 || num_sectors == 0 |
| 480 | || track > 79 || num_sectors > 72) { |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 481 | floppy_ret(regs, DISK_RET_EPARAM); |
| 482 | goto fail; |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 483 | } |
| 484 | |
| 485 | // send write-normal-data command (9 bytes) to controller |
| 486 | u8 data[12]; |
| 487 | data[0] = 0xc5; // c5: write normal data |
| 488 | data[1] = (head << 2) | drive; // HD DR1 DR2 |
| 489 | data[2] = track; |
| 490 | data[3] = head; |
| 491 | data[4] = sector; |
| 492 | data[5] = 2; // 512 byte sector size |
| 493 | data[6] = sector + num_sectors - 1; // last sector to write on track |
| 494 | data[7] = 0; // Gap length |
| 495 | data[8] = 0xff; // Gap length |
| 496 | |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 497 | int ret = floppy_cmd(regs, (num_sectors * 512) - 1, data, 9); |
| 498 | if (ret) |
| 499 | goto fail; |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 500 | |
| 501 | if (data[0] & 0xc0) { |
| 502 | if (data[1] & 0x02) { |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 503 | floppy_ret(regs, DISK_RET_EWRITEPROTECT); |
| 504 | goto fail; |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 505 | } |
| 506 | BX_PANIC("int13_diskette_function: read error\n"); |
| 507 | } |
| 508 | |
| 509 | // ??? should track be new val from return_status[3] ? |
| 510 | set_diskette_current_cyl(drive, track); |
| 511 | // AL = number of sectors read (same value as passed) |
| 512 | floppy_ret(regs, DISK_RET_SUCCESS); |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 513 | return; |
| 514 | fail: |
| 515 | regs->al = 0; // no sectors read |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 516 | } |
| 517 | |
| 518 | // Verify Diskette Sectors |
| 519 | static void |
| 520 | floppy_1304(struct bregs *regs, u8 drive) |
| 521 | { |
| 522 | if (check_drive(regs, drive)) |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 523 | goto fail; |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 524 | |
| 525 | u8 num_sectors = regs->al; |
| 526 | u8 track = regs->ch; |
| 527 | u8 sector = regs->cl; |
| 528 | u8 head = regs->dh; |
| 529 | |
| 530 | if (head > 1 || sector == 0 || num_sectors == 0 |
| 531 | || track > 79 || num_sectors > 72) { |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 532 | floppy_ret(regs, DISK_RET_EPARAM); |
| 533 | goto fail; |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 534 | } |
| 535 | |
| 536 | // ??? should track be new val from return_status[3] ? |
| 537 | set_diskette_current_cyl(drive, track); |
| 538 | // AL = number of sectors verified (same value as passed) |
| 539 | floppy_ret(regs, DISK_RET_SUCCESS); |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 540 | return; |
| 541 | fail: |
| 542 | regs->al = 0; // no sectors read |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 543 | } |
| 544 | |
| 545 | // format diskette track |
| 546 | static void |
| 547 | floppy_1305(struct bregs *regs, u8 drive) |
| 548 | { |
Kevin O'Connor | a05223c | 2008-06-28 12:15:57 -0400 | [diff] [blame] | 549 | dprintf(3, "floppy f05\n"); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 550 | |
| 551 | if (check_drive(regs, drive)) |
| 552 | return; |
| 553 | |
| 554 | u8 num_sectors = regs->al; |
| 555 | u8 head = regs->dh; |
| 556 | |
| 557 | if (head > 1 || num_sectors == 0 || num_sectors > 18) { |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 558 | floppy_ret(regs, DISK_RET_EPARAM); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 559 | return; |
| 560 | } |
| 561 | |
| 562 | // send format-track command (6 bytes) to controller |
| 563 | u8 data[12]; |
| 564 | data[0] = 0x4d; // 4d: format track |
| 565 | data[1] = (head << 2) | drive; // HD DR1 DR2 |
| 566 | data[2] = 2; // 512 byte sector size |
| 567 | data[3] = num_sectors; // number of sectors per track |
| 568 | data[4] = 0; // Gap length |
| 569 | data[5] = 0xf6; // Fill byte |
| 570 | |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 571 | int ret = floppy_cmd(regs, (num_sectors * 4) - 1, data, 6); |
| 572 | if (ret) |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 573 | return; |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 574 | |
| 575 | if (data[0] & 0xc0) { |
| 576 | if (data[1] & 0x02) { |
Kevin O'Connor | a68aeaf | 2008-07-07 21:37:10 -0400 | [diff] [blame] | 577 | floppy_ret(regs, DISK_RET_EWRITEPROTECT); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 578 | return; |
| 579 | } |
| 580 | BX_PANIC("int13_diskette_function: read error\n"); |
| 581 | } |
| 582 | |
| 583 | set_diskette_current_cyl(drive, 0); |
| 584 | floppy_ret(regs, 0); |
| 585 | } |
| 586 | |
| 587 | // read diskette drive parameters |
| 588 | static void |
| 589 | floppy_1308(struct bregs *regs, u8 drive) |
| 590 | { |
Kevin O'Connor | a05223c | 2008-06-28 12:15:57 -0400 | [diff] [blame] | 591 | dprintf(3, "floppy f08\n"); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 592 | |
| 593 | u8 drive_type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE); |
| 594 | u8 num_floppies = 0; |
| 595 | if (drive_type & 0xf0) |
| 596 | num_floppies++; |
| 597 | if (drive_type & 0x0f) |
| 598 | num_floppies++; |
| 599 | |
| 600 | if (drive > 1) { |
| 601 | regs->ax = 0; |
| 602 | regs->bx = 0; |
| 603 | regs->cx = 0; |
| 604 | regs->dx = 0; |
| 605 | regs->es = 0; |
| 606 | regs->di = 0; |
| 607 | regs->dl = num_floppies; |
Kevin O'Connor | e10d345 | 2008-07-09 22:45:12 -0400 | [diff] [blame] | 608 | set_fail(regs); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 609 | return; |
| 610 | } |
| 611 | |
| 612 | if (drive == 0) |
| 613 | drive_type >>= 4; |
| 614 | else |
| 615 | drive_type &= 0x0f; |
| 616 | |
| 617 | regs->bh = 0; |
| 618 | regs->bl = drive_type; |
| 619 | regs->ah = 0; |
| 620 | regs->al = 0; |
| 621 | regs->dl = num_floppies; |
| 622 | |
| 623 | switch (drive_type) { |
| 624 | case 0: // none |
| 625 | regs->cx = 0; |
| 626 | regs->dh = 0; // max head # |
| 627 | break; |
| 628 | |
| 629 | case 1: // 360KB, 5.25" |
| 630 | regs->cx = 0x2709; // 40 tracks, 9 sectors |
| 631 | regs->dh = 1; // max head # |
| 632 | break; |
| 633 | |
| 634 | case 2: // 1.2MB, 5.25" |
| 635 | regs->cx = 0x4f0f; // 80 tracks, 15 sectors |
| 636 | regs->dh = 1; // max head # |
| 637 | break; |
| 638 | |
| 639 | case 3: // 720KB, 3.5" |
| 640 | regs->cx = 0x4f09; // 80 tracks, 9 sectors |
| 641 | regs->dh = 1; // max head # |
| 642 | break; |
| 643 | |
| 644 | case 4: // 1.44MB, 3.5" |
| 645 | regs->cx = 0x4f12; // 80 tracks, 18 sectors |
| 646 | regs->dh = 1; // max head # |
| 647 | break; |
| 648 | |
| 649 | case 5: // 2.88MB, 3.5" |
| 650 | regs->cx = 0x4f24; // 80 tracks, 36 sectors |
| 651 | regs->dh = 1; // max head # |
| 652 | break; |
| 653 | |
| 654 | case 6: // 160k, 5.25" |
| 655 | regs->cx = 0x2708; // 40 tracks, 8 sectors |
| 656 | regs->dh = 0; // max head # |
| 657 | break; |
| 658 | |
| 659 | case 7: // 180k, 5.25" |
| 660 | regs->cx = 0x2709; // 40 tracks, 9 sectors |
| 661 | regs->dh = 0; // max head # |
| 662 | break; |
| 663 | |
| 664 | case 8: // 320k, 5.25" |
| 665 | regs->cx = 0x2708; // 40 tracks, 8 sectors |
| 666 | regs->dh = 1; // max head # |
| 667 | break; |
| 668 | |
| 669 | default: // ? |
| 670 | BX_PANIC("floppy: int13: bad floppy type\n"); |
| 671 | } |
| 672 | |
| 673 | /* set es & di to point to 11 byte diskette param table in ROM */ |
| 674 | regs->es = SEG_BIOS; |
Kevin O'Connor | 117fc21 | 2008-04-13 18:17:02 -0400 | [diff] [blame] | 675 | regs->di = (u32)&diskette_param_table2; |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 676 | /* disk status not changed upon success */ |
Kevin O'Connor | e10d345 | 2008-07-09 22:45:12 -0400 | [diff] [blame] | 677 | set_success(regs); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 678 | } |
| 679 | |
| 680 | // read diskette drive type |
| 681 | static void |
| 682 | floppy_1315(struct bregs *regs, u8 drive) |
| 683 | { |
Kevin O'Connor | a05223c | 2008-06-28 12:15:57 -0400 | [diff] [blame] | 684 | dprintf(6, "floppy f15\n"); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 685 | if (drive > 1) { |
Kevin O'Connor | 6c78122 | 2008-03-09 12:19:23 -0400 | [diff] [blame] | 686 | set_fail(regs); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 687 | regs->ah = 0; // only 2 drives supported |
| 688 | // set_diskette_ret_status here ??? |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 689 | return; |
| 690 | } |
| 691 | u8 drive_type = get_drive_type(drive); |
| 692 | |
| 693 | regs->ah = (drive_type != 0); |
Kevin O'Connor | 6c78122 | 2008-03-09 12:19:23 -0400 | [diff] [blame] | 694 | set_success(regs); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 695 | } |
| 696 | |
| 697 | // get diskette change line status |
| 698 | static void |
| 699 | floppy_1316(struct bregs *regs, u8 drive) |
| 700 | { |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 701 | if (drive > 1) { |
| 702 | floppy_ret(regs, DISK_RET_EPARAM); |
| 703 | return; |
| 704 | } |
| 705 | floppy_ret(regs, DISK_RET_ECHANGED); |
| 706 | } |
| 707 | |
| 708 | static void |
| 709 | floppy_13XX(struct bregs *regs, u8 drive) |
| 710 | { |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 711 | floppy_ret(regs, DISK_RET_EPARAM); |
| 712 | } |
| 713 | |
| 714 | void |
| 715 | floppy_13(struct bregs *regs, u8 drive) |
| 716 | { |
Kevin O'Connor | b792b3c | 2008-02-29 00:20:32 -0500 | [diff] [blame] | 717 | if (! CONFIG_FLOPPY_SUPPORT) { |
| 718 | // Minimal stubs |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 719 | switch (regs->ah) { |
| 720 | case 0x01: floppy_1301(regs, drive); break; |
| 721 | default: floppy_13XX(regs, drive); break; |
| 722 | } |
Kevin O'Connor | b792b3c | 2008-02-29 00:20:32 -0500 | [diff] [blame] | 723 | return; |
| 724 | } |
| 725 | switch (regs->ah) { |
| 726 | case 0x00: floppy_1300(regs, drive); break; |
| 727 | case 0x01: floppy_1301(regs, drive); break; |
| 728 | case 0x02: floppy_1302(regs, drive); break; |
| 729 | case 0x03: floppy_1303(regs, drive); break; |
| 730 | case 0x04: floppy_1304(regs, drive); break; |
| 731 | case 0x05: floppy_1305(regs, drive); break; |
| 732 | case 0x08: floppy_1308(regs, drive); break; |
| 733 | case 0x15: floppy_1315(regs, drive); break; |
| 734 | case 0x16: floppy_1316(regs, drive); break; |
| 735 | default: floppy_13XX(regs, drive); break; |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 736 | } |
| 737 | } |
| 738 | |
| 739 | // INT 0Eh Diskette Hardware ISR Entry Point |
Kevin O'Connor | 1978676 | 2008-03-05 21:09:59 -0500 | [diff] [blame] | 740 | void VISIBLE16 |
Kevin O'Connor | ed12849 | 2008-03-11 11:14:59 -0400 | [diff] [blame] | 741 | handle_0e() |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 742 | { |
Kevin O'Connor | 15c1f22 | 2008-06-12 22:59:43 -0400 | [diff] [blame] | 743 | debug_isr(DEBUG_ISR_0e); |
Kevin O'Connor | 4096702 | 2008-07-21 22:23:05 -0400 | [diff] [blame] | 744 | if (! CONFIG_FLOPPY_SUPPORT) |
| 745 | goto done; |
| 746 | |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 747 | if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0) { |
| 748 | outb(0x08, PORT_FD_DATA); // sense interrupt status |
| 749 | while ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0) |
| 750 | ; |
| 751 | do { |
| 752 | inb(PORT_FD_DATA); |
| 753 | } while ((inb(PORT_FD_STATUS) & 0xc0) == 0xc0); |
| 754 | } |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 755 | // diskette interrupt has occurred |
| 756 | SETBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT); |
Kevin O'Connor | 4096702 | 2008-07-21 22:23:05 -0400 | [diff] [blame] | 757 | |
| 758 | done: |
| 759 | eoi_pic1(); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 760 | } |
| 761 | |
| 762 | // Called from int08 handler. |
| 763 | void |
| 764 | floppy_tick() |
| 765 | { |
Kevin O'Connor | 4096702 | 2008-07-21 22:23:05 -0400 | [diff] [blame] | 766 | if (! CONFIG_FLOPPY_SUPPORT) |
| 767 | return; |
| 768 | |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 769 | // time to turn off drive(s)? |
| 770 | u8 fcount = GET_BDA(floppy_motor_counter); |
| 771 | if (fcount) { |
| 772 | fcount--; |
| 773 | SET_BDA(floppy_motor_counter, fcount); |
| 774 | if (fcount == 0) |
| 775 | // turn motor(s) off |
| 776 | outb(inb(PORT_FD_DOR) & 0xcf, PORT_FD_DOR); |
| 777 | } |
| 778 | } |