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 getComAddr(struct bregs *regs)
23 u16 addr = GET_BDA(port_com[regs->dx]);
30 handle_1400(struct bregs *regs)
32 u16 addr = getComAddr(regs);
35 outb(inb(addr+3) | 0x80, addr+3);
36 if ((regs->al & 0xE0) == 0) {
40 u16 val16 = 0x600 >> ((regs->al & 0xE0) >> 5);
41 outb(val16 & 0xFF, addr);
42 outb(val16 >> 8, addr+1);
44 outb(regs->al & 0x1F, addr+3);
45 regs->ah = inb(addr+5);
46 regs->al = inb(addr+6);
51 handle_1401(struct bregs *regs)
53 u16 addr = getComAddr(regs);
56 u16 timer = GET_BDA(timer_counter);
57 u16 timeout = GET_BDA(com_timeout[regs->dx]);
58 while (((inb(addr+5) & 0x60) != 0x60) && (timeout)) {
59 u16 val16 = GET_BDA(timer_counter);
67 regs->ah = inb(addr+5);
74 handle_1402(struct bregs *regs)
76 u16 addr = getComAddr(regs);
79 u16 timer = GET_BDA(timer_counter);
80 u16 timeout = GET_BDA(com_timeout[regs->dx]);
81 while (((inb(addr+5) & 0x01) == 0) && (timeout)) {
82 u16 val16 = GET_BDA(timer_counter);
92 regs->ah = inb(addr+5);
98 handle_1403(struct bregs *regs)
100 u16 addr = getComAddr(regs);
103 regs->ah = inb(addr+5);
104 regs->al = inb(addr+6);
109 handle_14XX(struct bregs *regs)
115 // INT 14h Serial Communications Service Entry Point
117 handle_14(struct bregs *regs)
124 case 0x00: handle_1400(regs); break;
125 case 0x01: handle_1401(regs); break;
126 case 0x02: handle_1402(regs); break;
127 case 0x03: handle_1403(regs); break;
128 default: handle_14XX(regs); break;
134 /****************************************************************
136 ****************************************************************/
139 getLptAddr(struct bregs *regs)
145 u16 addr = GET_BDA(port_lpt[regs->dx]);
152 lpt_ret(struct bregs *regs, u16 addr, u16 timeout)
154 u8 val8 = inb(addr+1);
155 regs->ah = (val8 ^ 0x48);
161 // INT 17 - PRINTER - WRITE CHARACTER
163 handle_1700(struct bregs *regs)
165 u16 addr = getLptAddr(regs);
168 u16 timeout = GET_BDA(lpt_timeout[regs->dx]) << 8;
170 outb(regs->al, addr);
171 u8 val8 = inb(addr+2);
172 outb(val8 | 0x01, addr+2); // send strobe
174 outb(val8 & ~0x01, addr+2);
175 while (((inb(addr+1) & 0x40) == 0x40) && (timeout))
178 lpt_ret(regs, addr, timeout);
181 // INT 17 - PRINTER - INITIALIZE PORT
183 handle_1701(struct bregs *regs)
185 u16 addr = getLptAddr(regs);
188 u16 timeout = GET_BDA(lpt_timeout[regs->dx]) << 8;
190 u8 val8 = inb(addr+2);
191 outb(val8 & ~0x04, addr+2); // send init
193 outb(val8 | 0x04, addr+2);
195 lpt_ret(regs, addr, timeout);
198 // INT 17 - PRINTER - GET STATUS
200 handle_1702(struct bregs *regs)
202 u16 addr = getLptAddr(regs);
205 u16 timeout = GET_BDA(lpt_timeout[regs->dx]) << 8;
207 lpt_ret(regs, addr, timeout);
211 handle_17XX(struct bregs *regs)
217 // INT17h : Printer Service Entry Point
219 handle_17(struct bregs *regs)
226 case 0x00: handle_1700(regs); break;
227 case 0x01: handle_1701(regs); break;
228 case 0x02: handle_1702(regs); break;
229 default: handle_17XX(regs); break;