1 // 16bit code to handle serial and printer services.
3 // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
4 // Copyright (C) 2002 MandrakeSoft S.A.
6 // This file may be distributed under the terms of the GNU GPLv3 license.
8 #include "biosvar.h" // struct bregs
9 #include "util.h" // debug_enter
12 /****************************************************************
14 ****************************************************************/
17 detect_serial(u16 port, u8 timeout, u8 count)
20 if (inb(port+1) != 0x02)
22 if (inb(port+2) != 0x02)
25 SET_BDA(port_com[count], port);
26 SET_BDA(com_timeout[count], timeout);
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);
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));
45 getComAddr(struct bregs *regs)
51 u16 addr = GET_BDA(port_com[regs->dx]);
58 handle_1400(struct bregs *regs)
60 u16 addr = getComAddr(regs);
63 outb(inb(addr+3) | 0x80, addr+3);
64 if ((regs->al & 0xE0) == 0) {
68 u16 val16 = 0x600 >> ((regs->al & 0xE0) >> 5);
69 outb(val16 & 0xFF, addr);
70 outb(val16 >> 8, addr+1);
72 outb(regs->al & 0x1F, addr+3);
73 regs->ah = inb(addr+5);
74 regs->al = inb(addr+6);
79 handle_1401(struct bregs *regs)
81 u16 addr = getComAddr(regs);
84 u16 timer = GET_BDA(timer_counter);
85 u16 timeout = GET_BDA(com_timeout[regs->dx]);
86 while (((inb(addr+5) & 0x60) != 0x60) && (timeout)) {
87 u16 val16 = GET_BDA(timer_counter);
95 regs->ah = inb(addr+5);
102 handle_1402(struct bregs *regs)
104 u16 addr = getComAddr(regs);
107 u16 timer = GET_BDA(timer_counter);
108 u16 timeout = GET_BDA(com_timeout[regs->dx]);
109 while (((inb(addr+5) & 0x01) == 0) && (timeout)) {
110 u16 val16 = GET_BDA(timer_counter);
111 if (val16 != timer) {
118 regs->al = inb(addr);
120 regs->ah = inb(addr+5);
126 handle_1403(struct bregs *regs)
128 u16 addr = getComAddr(regs);
131 regs->ah = inb(addr+5);
132 regs->al = inb(addr+6);
137 handle_14XX(struct bregs *regs)
143 // INT 14h Serial Communications Service Entry Point
145 handle_14(struct bregs *regs)
152 case 0x00: handle_1400(regs); break;
153 case 0x01: handle_1401(regs); break;
154 case 0x02: handle_1402(regs); break;
155 case 0x03: handle_1403(regs); break;
156 default: handle_14XX(regs); break;
161 /****************************************************************
163 ****************************************************************/
166 detect_parport(u16 port, u8 timeout, u8 count)
169 outb(inb(port+2) & 0xdf, port+2);
172 if (inb(port) != 0xaa)
175 SET_BDA(port_lpt[count], port);
176 SET_BDA(lpt_timeout[count], timeout);
184 count += detect_parport(0x378, 0x14, count);
185 count += detect_parport(0x278, 0x14, count);
187 // Equipment word bits 14..15 determing # parallel ports
188 u16 eqb = GET_BDA(equipment_list_flags);
189 SET_BDA(equipment_list_flags, (eqb & 0x3fff) | (count << 14));
193 getLptAddr(struct bregs *regs)
199 u16 addr = GET_BDA(port_lpt[regs->dx]);
206 lpt_ret(struct bregs *regs, u16 addr, u16 timeout)
208 u8 val8 = inb(addr+1);
209 regs->ah = (val8 ^ 0x48);
215 // INT 17 - PRINTER - WRITE CHARACTER
217 handle_1700(struct bregs *regs)
219 u16 addr = getLptAddr(regs);
222 u16 timeout = GET_BDA(lpt_timeout[regs->dx]) << 8;
224 outb(regs->al, addr);
225 u8 val8 = inb(addr+2);
226 outb(val8 | 0x01, addr+2); // send strobe
228 outb(val8 & ~0x01, addr+2);
229 while (((inb(addr+1) & 0x40) == 0x40) && (timeout))
232 lpt_ret(regs, addr, timeout);
235 // INT 17 - PRINTER - INITIALIZE PORT
237 handle_1701(struct bregs *regs)
239 u16 addr = getLptAddr(regs);
242 u16 timeout = GET_BDA(lpt_timeout[regs->dx]) << 8;
244 u8 val8 = inb(addr+2);
245 outb(val8 & ~0x04, addr+2); // send init
247 outb(val8 | 0x04, addr+2);
249 lpt_ret(regs, addr, timeout);
252 // INT 17 - PRINTER - GET STATUS
254 handle_1702(struct bregs *regs)
256 u16 addr = getLptAddr(regs);
259 u16 timeout = GET_BDA(lpt_timeout[regs->dx]) << 8;
261 lpt_ret(regs, addr, timeout);
265 handle_17XX(struct bregs *regs)
271 // INT17h : Printer Service Entry Point
273 handle_17(struct bregs *regs)
280 case 0x00: handle_1700(regs); break;
281 case 0x01: handle_1701(regs); break;
282 case 0x02: handle_1702(regs); break;
283 default: handle_17XX(regs); break;