Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 1 | // 16bit code to handle serial and printer services. |
| 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 "biosvar.h" // struct bregs |
| 9 | #include "util.h" // debug_enter |
| 10 | |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 11 | |
| 12 | /**************************************************************** |
| 13 | * COM ports |
| 14 | ****************************************************************/ |
| 15 | |
| 16 | static u16 |
Kevin O'Connor | 913cc2e | 2008-04-13 17:31:45 -0400 | [diff] [blame] | 17 | detect_serial(u16 port, u8 timeout, u8 count) |
| 18 | { |
| 19 | outb(0x02, port+1); |
| 20 | if (inb(port+1) != 0x02) |
| 21 | return 0; |
| 22 | if (inb(port+2) != 0x02) |
| 23 | return 0; |
| 24 | outb(0x00, port+1); |
| 25 | SET_BDA(port_com[count], port); |
| 26 | SET_BDA(com_timeout[count], timeout); |
| 27 | return 1; |
| 28 | } |
| 29 | |
| 30 | void |
| 31 | serial_setup() |
| 32 | { |
| 33 | u16 count = 0; |
| 34 | count += detect_serial(0x3f8, 0x0a, count); |
| 35 | count += detect_serial(0x2f8, 0x0a, count); |
| 36 | count += detect_serial(0x3e8, 0x0a, count); |
| 37 | count += detect_serial(0x2e8, 0x0a, count); |
| 38 | |
| 39 | // Equipment word bits 9..11 determing # serial ports |
| 40 | u16 eqb = GET_BDA(equipment_list_flags); |
| 41 | SET_BDA(equipment_list_flags, (eqb & 0xf1ff) | (count << 9)); |
| 42 | } |
| 43 | |
| 44 | static u16 |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 45 | getComAddr(struct bregs *regs) |
| 46 | { |
| 47 | if (regs->dx >= 4) { |
Kevin O'Connor | 6c78122 | 2008-03-09 12:19:23 -0400 | [diff] [blame] | 48 | set_fail(regs); |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 49 | return 0; |
| 50 | } |
| 51 | u16 addr = GET_BDA(port_com[regs->dx]); |
| 52 | if (! addr) |
Kevin O'Connor | 6c78122 | 2008-03-09 12:19:23 -0400 | [diff] [blame] | 53 | set_fail(regs); |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 54 | return addr; |
| 55 | } |
| 56 | |
Kevin O'Connor | 1812e20 | 2008-05-07 21:29:50 -0400 | [diff] [blame] | 57 | // SERIAL - INITIALIZE PORT |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 58 | static void |
| 59 | handle_1400(struct bregs *regs) |
| 60 | { |
| 61 | u16 addr = getComAddr(regs); |
| 62 | if (!addr) |
| 63 | return; |
| 64 | outb(inb(addr+3) | 0x80, addr+3); |
| 65 | if ((regs->al & 0xE0) == 0) { |
| 66 | outb(0x17, addr); |
| 67 | outb(0x04, addr+1); |
| 68 | } else { |
| 69 | u16 val16 = 0x600 >> ((regs->al & 0xE0) >> 5); |
| 70 | outb(val16 & 0xFF, addr); |
| 71 | outb(val16 >> 8, addr+1); |
| 72 | } |
| 73 | outb(regs->al & 0x1F, addr+3); |
| 74 | regs->ah = inb(addr+5); |
| 75 | regs->al = inb(addr+6); |
Kevin O'Connor | 6c78122 | 2008-03-09 12:19:23 -0400 | [diff] [blame] | 76 | set_success(regs); |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 77 | } |
| 78 | |
Kevin O'Connor | 1812e20 | 2008-05-07 21:29:50 -0400 | [diff] [blame] | 79 | // SERIAL - WRITE CHARACTER TO PORT |
| 80 | static void |
| 81 | handle_1401(struct bregs *regs) |
| 82 | { |
| 83 | u16 addr = getComAddr(regs); |
| 84 | if (!addr) |
| 85 | return; |
Kevin O'Connor | 5c73240 | 2008-06-07 10:43:07 -0400 | [diff] [blame^] | 86 | u16 timer = GET_BDA(timer_counter); |
Kevin O'Connor | 1812e20 | 2008-05-07 21:29:50 -0400 | [diff] [blame] | 87 | u16 timeout = GET_BDA(com_timeout[regs->dx]); |
Kevin O'Connor | 5c73240 | 2008-06-07 10:43:07 -0400 | [diff] [blame^] | 88 | while (((inb(addr+5) & 0x60) != 0x60) && (timeout)) { |
| 89 | u16 val16 = GET_BDA(timer_counter); |
| 90 | if (val16 != timer) { |
| 91 | timer = val16; |
| 92 | timeout--; |
| 93 | } |
| 94 | } |
| 95 | if (timeout) |
| 96 | outb(regs->al, addr); |
Kevin O'Connor | 1812e20 | 2008-05-07 21:29:50 -0400 | [diff] [blame] | 97 | regs->ah = inb(addr+5); |
Kevin O'Connor | 5c73240 | 2008-06-07 10:43:07 -0400 | [diff] [blame^] | 98 | if (!timeout) |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 99 | regs->ah |= 0x80; |
Kevin O'Connor | 6c78122 | 2008-03-09 12:19:23 -0400 | [diff] [blame] | 100 | set_success(regs); |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 101 | } |
| 102 | |
Kevin O'Connor | 1812e20 | 2008-05-07 21:29:50 -0400 | [diff] [blame] | 103 | // SERIAL - READ CHARACTER FROM PORT |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 104 | static void |
| 105 | handle_1402(struct bregs *regs) |
| 106 | { |
| 107 | u16 addr = getComAddr(regs); |
| 108 | if (!addr) |
| 109 | return; |
| 110 | u16 timer = GET_BDA(timer_counter); |
| 111 | u16 timeout = GET_BDA(com_timeout[regs->dx]); |
| 112 | while (((inb(addr+5) & 0x01) == 0) && (timeout)) { |
| 113 | u16 val16 = GET_BDA(timer_counter); |
| 114 | if (val16 != timer) { |
| 115 | timer = val16; |
| 116 | timeout--; |
| 117 | } |
| 118 | } |
| 119 | if (timeout) { |
| 120 | regs->ah = 0; |
| 121 | regs->al = inb(addr); |
| 122 | } else { |
| 123 | regs->ah = inb(addr+5); |
| 124 | } |
Kevin O'Connor | 6c78122 | 2008-03-09 12:19:23 -0400 | [diff] [blame] | 125 | set_success(regs); |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 126 | } |
| 127 | |
Kevin O'Connor | 1812e20 | 2008-05-07 21:29:50 -0400 | [diff] [blame] | 128 | // SERIAL - GET PORT STATUS |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 129 | static void |
| 130 | handle_1403(struct bregs *regs) |
| 131 | { |
| 132 | u16 addr = getComAddr(regs); |
| 133 | if (!addr) |
| 134 | return; |
| 135 | regs->ah = inb(addr+5); |
| 136 | regs->al = inb(addr+6); |
Kevin O'Connor | 6c78122 | 2008-03-09 12:19:23 -0400 | [diff] [blame] | 137 | set_success(regs); |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | static void |
| 141 | handle_14XX(struct bregs *regs) |
| 142 | { |
| 143 | // Unsupported |
Kevin O'Connor | 6c78122 | 2008-03-09 12:19:23 -0400 | [diff] [blame] | 144 | set_fail(regs); |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 145 | } |
| 146 | |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 147 | // INT 14h Serial Communications Service Entry Point |
Kevin O'Connor | 1978676 | 2008-03-05 21:09:59 -0500 | [diff] [blame] | 148 | void VISIBLE16 |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 149 | handle_14(struct bregs *regs) |
| 150 | { |
| 151 | debug_enter(regs); |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 152 | |
| 153 | irq_enable(); |
| 154 | |
| 155 | switch (regs->ah) { |
| 156 | case 0x00: handle_1400(regs); break; |
| 157 | case 0x01: handle_1401(regs); break; |
| 158 | case 0x02: handle_1402(regs); break; |
| 159 | case 0x03: handle_1403(regs); break; |
| 160 | default: handle_14XX(regs); break; |
| 161 | } |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 162 | } |
| 163 | |
| 164 | |
| 165 | /**************************************************************** |
| 166 | * LPT ports |
| 167 | ****************************************************************/ |
| 168 | |
| 169 | static u16 |
Kevin O'Connor | 913cc2e | 2008-04-13 17:31:45 -0400 | [diff] [blame] | 170 | detect_parport(u16 port, u8 timeout, u8 count) |
| 171 | { |
| 172 | // clear input mode |
| 173 | outb(inb(port+2) & 0xdf, port+2); |
| 174 | |
| 175 | outb(0xaa, port); |
| 176 | if (inb(port) != 0xaa) |
| 177 | // Not present |
| 178 | return 0; |
| 179 | SET_BDA(port_lpt[count], port); |
| 180 | SET_BDA(lpt_timeout[count], timeout); |
| 181 | return 1; |
| 182 | } |
| 183 | |
| 184 | void |
| 185 | lpt_setup() |
| 186 | { |
| 187 | u16 count = 0; |
| 188 | count += detect_parport(0x378, 0x14, count); |
| 189 | count += detect_parport(0x278, 0x14, count); |
| 190 | |
| 191 | // Equipment word bits 14..15 determing # parallel ports |
| 192 | u16 eqb = GET_BDA(equipment_list_flags); |
| 193 | SET_BDA(equipment_list_flags, (eqb & 0x3fff) | (count << 14)); |
| 194 | } |
| 195 | |
| 196 | static u16 |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 197 | getLptAddr(struct bregs *regs) |
| 198 | { |
| 199 | if (regs->dx >= 3) { |
Kevin O'Connor | 6c78122 | 2008-03-09 12:19:23 -0400 | [diff] [blame] | 200 | set_fail(regs); |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 201 | return 0; |
| 202 | } |
| 203 | u16 addr = GET_BDA(port_lpt[regs->dx]); |
| 204 | if (! addr) |
Kevin O'Connor | 6c78122 | 2008-03-09 12:19:23 -0400 | [diff] [blame] | 205 | set_fail(regs); |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 206 | return addr; |
| 207 | } |
| 208 | |
| 209 | static void |
| 210 | lpt_ret(struct bregs *regs, u16 addr, u16 timeout) |
| 211 | { |
| 212 | u8 val8 = inb(addr+1); |
| 213 | regs->ah = (val8 ^ 0x48); |
| 214 | if (!timeout) |
| 215 | regs->ah |= 0x01; |
Kevin O'Connor | 6c78122 | 2008-03-09 12:19:23 -0400 | [diff] [blame] | 216 | set_success(regs); |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 217 | } |
| 218 | |
| 219 | // INT 17 - PRINTER - WRITE CHARACTER |
| 220 | static void |
| 221 | handle_1700(struct bregs *regs) |
| 222 | { |
| 223 | u16 addr = getLptAddr(regs); |
| 224 | if (!addr) |
| 225 | return; |
| 226 | u16 timeout = GET_BDA(lpt_timeout[regs->dx]) << 8; |
| 227 | |
| 228 | outb(regs->al, addr); |
| 229 | u8 val8 = inb(addr+2); |
| 230 | outb(val8 | 0x01, addr+2); // send strobe |
| 231 | nop(); |
| 232 | outb(val8 & ~0x01, addr+2); |
| 233 | while (((inb(addr+1) & 0x40) == 0x40) && (timeout)) |
| 234 | timeout--; |
| 235 | |
| 236 | lpt_ret(regs, addr, timeout); |
| 237 | } |
| 238 | |
| 239 | // INT 17 - PRINTER - INITIALIZE PORT |
| 240 | static void |
| 241 | handle_1701(struct bregs *regs) |
| 242 | { |
| 243 | u16 addr = getLptAddr(regs); |
| 244 | if (!addr) |
| 245 | return; |
| 246 | u16 timeout = GET_BDA(lpt_timeout[regs->dx]) << 8; |
| 247 | |
| 248 | u8 val8 = inb(addr+2); |
| 249 | outb(val8 & ~0x04, addr+2); // send init |
| 250 | nop(); |
| 251 | outb(val8 | 0x04, addr+2); |
| 252 | |
| 253 | lpt_ret(regs, addr, timeout); |
| 254 | } |
| 255 | |
| 256 | // INT 17 - PRINTER - GET STATUS |
| 257 | static void |
| 258 | handle_1702(struct bregs *regs) |
| 259 | { |
| 260 | u16 addr = getLptAddr(regs); |
| 261 | if (!addr) |
| 262 | return; |
| 263 | u16 timeout = GET_BDA(lpt_timeout[regs->dx]) << 8; |
| 264 | |
| 265 | lpt_ret(regs, addr, timeout); |
| 266 | } |
| 267 | |
| 268 | static void |
| 269 | handle_17XX(struct bregs *regs) |
| 270 | { |
| 271 | // Unsupported |
Kevin O'Connor | 6c78122 | 2008-03-09 12:19:23 -0400 | [diff] [blame] | 272 | set_fail(regs); |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 273 | } |
| 274 | |
| 275 | // INT17h : Printer Service Entry Point |
Kevin O'Connor | 1978676 | 2008-03-05 21:09:59 -0500 | [diff] [blame] | 276 | void VISIBLE16 |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 277 | handle_17(struct bregs *regs) |
| 278 | { |
| 279 | debug_enter(regs); |
Kevin O'Connor | 38fcbfe | 2008-02-25 22:30:47 -0500 | [diff] [blame] | 280 | |
| 281 | irq_enable(); |
| 282 | |
| 283 | switch (regs->ah) { |
| 284 | case 0x00: handle_1700(regs); break; |
| 285 | case 0x01: handle_1701(regs); break; |
| 286 | case 0x02: handle_1702(regs); break; |
| 287 | default: handle_17XX(regs); break; |
| 288 | } |
Kevin O'Connor | f076a3e | 2008-02-25 22:25:15 -0500 | [diff] [blame] | 289 | } |