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
12 // Timers based on 18.2Hz clock irq.
14 u16 last_tick, remaining;
18 initTickTimer(u16 count)
20 struct tick_timer_s tt = {GET_BDA(timer_counter), count};
25 checkTickTimer(struct tick_timer_s *tt)
27 u16 timer = GET_BDA(timer_counter);
28 if (tt->last_tick != timer) {
29 tt->last_tick = timer;
38 /****************************************************************
40 ****************************************************************/
43 detect_serial(u16 port, u8 timeout, u8 count)
45 outb(0x02, port+SEROFF_IER);
46 u8 ier = inb(port+SEROFF_IER);
49 u8 iir = inb(port+SEROFF_IIR);
50 if ((iir & 0x3f) != 0x02)
53 outb(0x00, port+SEROFF_IER);
54 SET_BDA(port_com[count], port);
55 SET_BDA(com_timeout[count], timeout);
64 dprintf(3, "init serial\n");
67 count += detect_serial(PORT_SERIAL1, 0x0a, count);
68 count += detect_serial(PORT_SERIAL2, 0x0a, count);
69 count += detect_serial(PORT_SERIAL3, 0x0a, count);
70 count += detect_serial(PORT_SERIAL4, 0x0a, count);
71 dprintf(1, "Found %d serial ports\n", count);
73 // Equipment word bits 9..11 determing # serial ports
74 u16 eqb = GET_BDA(equipment_list_flags);
75 SET_BDA(equipment_list_flags, (eqb & 0xf1ff) | (count << 9));
79 getComAddr(struct bregs *regs)
85 u16 addr = GET_BDA(port_com[regs->dx]);
91 // SERIAL - INITIALIZE PORT
93 handle_1400(struct bregs *regs)
95 u16 addr = getComAddr(regs);
98 outb(inb(addr+SEROFF_LCR) | 0x80, addr+SEROFF_LCR);
99 if ((regs->al & 0xE0) == 0) {
100 outb(0x17, addr+SEROFF_DLL);
101 outb(0x04, addr+SEROFF_DLH);
103 u16 val16 = 0x600 >> ((regs->al & 0xE0) >> 5);
104 outb(val16 & 0xFF, addr+SEROFF_DLL);
105 outb(val16 >> 8, addr+SEROFF_DLH);
107 outb(regs->al & 0x1F, addr+SEROFF_LCR);
108 regs->ah = inb(addr+SEROFF_LSR);
109 regs->al = inb(addr+SEROFF_MSR);
113 // SERIAL - WRITE CHARACTER TO PORT
115 handle_1401(struct bregs *regs)
117 u16 addr = getComAddr(regs);
120 struct tick_timer_s tt = initTickTimer(GET_BDA(com_timeout[regs->dx]));
123 u8 lsr = inb(addr+SEROFF_LSR);
124 if ((lsr & 0x60) == 0x60) {
125 // Success - can write data
126 outb(regs->al, addr+SEROFF_DATA);
131 if (checkTickTimer(&tt)) {
132 // Timed out - can't write data.
133 regs->ah = lsr | 0x80;
141 // SERIAL - READ CHARACTER FROM PORT
143 handle_1402(struct bregs *regs)
145 u16 addr = getComAddr(regs);
148 struct tick_timer_s tt = initTickTimer(GET_BDA(com_timeout[regs->dx]));
151 u8 lsr = inb(addr+SEROFF_LSR);
153 // Success - can read data
154 regs->al = inb(addr+SEROFF_DATA);
158 if (checkTickTimer(&tt)) {
159 // Timed out - can't read data.
160 regs->ah = lsr | 0x80;
168 // SERIAL - GET PORT STATUS
170 handle_1403(struct bregs *regs)
172 u16 addr = getComAddr(regs);
175 regs->ah = inb(addr+SEROFF_LSR);
176 regs->al = inb(addr+SEROFF_MSR);
181 handle_14XX(struct bregs *regs)
187 // INT 14h Serial Communications Service Entry Point
189 handle_14(struct bregs *regs)
191 debug_enter(regs, DEBUG_HDL_14);
192 if (! CONFIG_SERIAL) {
198 case 0x00: handle_1400(regs); break;
199 case 0x01: handle_1401(regs); break;
200 case 0x02: handle_1402(regs); break;
201 case 0x03: handle_1403(regs); break;
202 default: handle_14XX(regs); break;
206 // XXX - Baud Rate Generator Table
207 u8 BaudTable[16] VAR16FIXED(0xe729);
210 /****************************************************************
212 ****************************************************************/
215 detect_parport(u16 port, u8 timeout, u8 count)
218 outb(inb(port+2) & 0xdf, port+2);
221 if (inb(port) != 0xaa)
224 SET_BDA(port_lpt[count], port);
225 SET_BDA(lpt_timeout[count], timeout);
234 dprintf(3, "init lpt\n");
237 count += detect_parport(PORT_LPT1, 0x14, count);
238 count += detect_parport(PORT_LPT2, 0x14, count);
239 dprintf(1, "Found %d lpt ports\n", count);
241 // Equipment word bits 14..15 determing # parallel ports
242 u16 eqb = GET_BDA(equipment_list_flags);
243 SET_BDA(equipment_list_flags, (eqb & 0x3fff) | (count << 14));
247 getLptAddr(struct bregs *regs)
253 u16 addr = GET_BDA(port_lpt[regs->dx]);
259 // INT 17 - PRINTER - WRITE CHARACTER
261 handle_1700(struct bregs *regs)
263 u16 addr = getLptAddr(regs);
267 struct tick_timer_s tt = initTickTimer(GET_BDA(lpt_timeout[regs->dx]));
270 outb(regs->al, addr);
271 u8 val8 = inb(addr+2);
272 outb(val8 | 0x01, addr+2); // send strobe
274 outb(val8 & ~0x01, addr+2);
283 if (checkTickTimer(&tt)) {
285 regs->ah = (v ^ 0x48) | 0x01;
294 // INT 17 - PRINTER - INITIALIZE PORT
296 handle_1701(struct bregs *regs)
298 u16 addr = getLptAddr(regs);
302 u8 val8 = inb(addr+2);
303 outb(val8 & ~0x04, addr+2); // send init
305 outb(val8 | 0x04, addr+2);
307 regs->ah = inb(addr+1) ^ 0x48;
311 // INT 17 - PRINTER - GET STATUS
313 handle_1702(struct bregs *regs)
315 u16 addr = getLptAddr(regs);
318 regs->ah = inb(addr+1) ^ 0x48;
323 handle_17XX(struct bregs *regs)
329 // INT17h : Printer Service Entry Point
331 handle_17(struct bregs *regs)
333 debug_enter(regs, DEBUG_HDL_17);
340 case 0x00: handle_1700(regs); break;
341 case 0x01: handle_1701(regs); break;
342 case 0x02: handle_1702(regs); break;
343 default: handle_17XX(regs); break;