1 // 16bit code to handle serial and printer services.
3 // Copyright (C) 2008,2009 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 LGPLv3 license.
8 #include "biosvar.h" // SET_BDA
9 #include "util.h" // debug_enter
10 #include "bregs.h" // struct bregs
13 /****************************************************************
15 ****************************************************************/
18 detect_serial(u16 port, u8 timeout, u8 count)
21 if (inb(port+1) != 0x02)
23 if (inb(port+2) != 0x02)
26 SET_BDA(port_com[count], port);
27 SET_BDA(com_timeout[count], timeout);
36 dprintf(3, "init serial\n");
39 count += detect_serial(0x3f8, 0x0a, count);
40 count += detect_serial(0x2f8, 0x0a, count);
41 count += detect_serial(0x3e8, 0x0a, count);
42 count += detect_serial(0x2e8, 0x0a, count);
43 dprintf(1, "Found %d serial ports\n", count);
45 // Equipment word bits 9..11 determing # serial ports
46 u16 eqb = GET_BDA(equipment_list_flags);
47 SET_BDA(equipment_list_flags, (eqb & 0xf1ff) | (count << 9));
51 getComAddr(struct bregs *regs)
57 u16 addr = GET_BDA(port_com[regs->dx]);
63 // SERIAL - INITIALIZE PORT
65 handle_1400(struct bregs *regs)
67 u16 addr = getComAddr(regs);
70 outb(inb(addr+3) | 0x80, addr+3);
71 if ((regs->al & 0xE0) == 0) {
75 u16 val16 = 0x600 >> ((regs->al & 0xE0) >> 5);
76 outb(val16 & 0xFF, addr);
77 outb(val16 >> 8, addr+1);
79 outb(regs->al & 0x1F, addr+3);
80 regs->ah = inb(addr+5);
81 regs->al = inb(addr+6);
85 // SERIAL - WRITE CHARACTER TO PORT
87 handle_1401(struct bregs *regs)
89 u16 addr = getComAddr(regs);
92 u16 timer = GET_BDA(timer_counter);
93 u16 timeout = GET_BDA(com_timeout[regs->dx]);
94 while (((inb(addr+5) & 0x60) != 0x60) && (timeout)) {
95 u16 val16 = GET_BDA(timer_counter);
102 outb(regs->al, addr);
103 regs->ah = inb(addr+5);
109 // SERIAL - READ CHARACTER FROM PORT
111 handle_1402(struct bregs *regs)
113 u16 addr = getComAddr(regs);
116 u16 timer = GET_BDA(timer_counter);
117 u16 timeout = GET_BDA(com_timeout[regs->dx]);
118 while (((inb(addr+5) & 0x01) == 0) && (timeout)) {
119 u16 val16 = GET_BDA(timer_counter);
120 if (val16 != timer) {
127 regs->al = inb(addr);
129 regs->ah = inb(addr+5);
134 // SERIAL - GET PORT STATUS
136 handle_1403(struct bregs *regs)
138 u16 addr = getComAddr(regs);
141 regs->ah = inb(addr+5);
142 regs->al = inb(addr+6);
147 handle_14XX(struct bregs *regs)
153 // INT 14h Serial Communications Service Entry Point
155 handle_14(struct bregs *regs)
157 debug_enter(regs, DEBUG_HDL_14);
158 if (! CONFIG_SERIAL) {
166 case 0x00: handle_1400(regs); break;
167 case 0x01: handle_1401(regs); break;
168 case 0x02: handle_1402(regs); break;
169 case 0x03: handle_1403(regs); break;
170 default: handle_14XX(regs); break;
174 // XXX - Baud Rate Generator Table
175 u8 BaudTable[16] VAR16FIXED(0xe729);
178 /****************************************************************
180 ****************************************************************/
183 detect_parport(u16 port, u8 timeout, u8 count)
186 outb(inb(port+2) & 0xdf, port+2);
189 if (inb(port) != 0xaa)
192 SET_BDA(port_lpt[count], port);
193 SET_BDA(lpt_timeout[count], timeout);
202 dprintf(3, "init lpt\n");
205 count += detect_parport(0x378, 0x14, count);
206 count += detect_parport(0x278, 0x14, count);
207 dprintf(1, "Found %d lpt ports\n", count);
209 // Equipment word bits 14..15 determing # parallel ports
210 u16 eqb = GET_BDA(equipment_list_flags);
211 SET_BDA(equipment_list_flags, (eqb & 0x3fff) | (count << 14));
215 getLptAddr(struct bregs *regs)
221 u16 addr = GET_BDA(port_lpt[regs->dx]);
228 lpt_ret(struct bregs *regs, u16 addr, u16 timeout)
230 u8 val8 = inb(addr+1);
231 regs->ah = (val8 ^ 0x48);
237 // INT 17 - PRINTER - WRITE CHARACTER
239 handle_1700(struct bregs *regs)
241 u16 addr = getLptAddr(regs);
244 u16 timeout = GET_BDA(lpt_timeout[regs->dx]) << 8;
246 outb(regs->al, addr);
247 u8 val8 = inb(addr+2);
248 outb(val8 | 0x01, addr+2); // send strobe
250 outb(val8 & ~0x01, addr+2);
251 // XXX - implement better timeout code.
252 while (((inb(addr+1) & 0x40) == 0x40) && (timeout))
255 lpt_ret(regs, addr, timeout);
258 // INT 17 - PRINTER - INITIALIZE PORT
260 handle_1701(struct bregs *regs)
262 u16 addr = getLptAddr(regs);
265 u16 timeout = GET_BDA(lpt_timeout[regs->dx]) << 8;
267 u8 val8 = inb(addr+2);
268 outb(val8 & ~0x04, addr+2); // send init
270 outb(val8 | 0x04, addr+2);
272 lpt_ret(regs, addr, timeout);
275 // INT 17 - PRINTER - GET STATUS
277 handle_1702(struct bregs *regs)
279 u16 addr = getLptAddr(regs);
282 u16 timeout = GET_BDA(lpt_timeout[regs->dx]) << 8;
284 lpt_ret(regs, addr, timeout);
288 handle_17XX(struct bregs *regs)
294 // INT17h : Printer Service Entry Point
296 handle_17(struct bregs *regs)
298 debug_enter(regs, DEBUG_HDL_17);
307 case 0x00: handle_1700(regs); break;
308 case 0x01: handle_1701(regs); break;
309 case 0x02: handle_1702(regs); break;
310 default: handle_17XX(regs); break;