// 16bit code to handle serial and printer services. // // Copyright (C) 2008 Kevin O'Connor // Copyright (C) 2002 MandrakeSoft S.A. // // This file may be distributed under the terms of the GNU GPLv3 license. #include "biosvar.h" // struct bregs #include "util.h" // debug_enter /**************************************************************** * COM ports ****************************************************************/ static u16 detect_serial(u16 port, u8 timeout, u8 count) { outb(0x02, port+1); if (inb(port+1) != 0x02) return 0; if (inb(port+2) != 0x02) return 0; outb(0x00, port+1); SET_BDA(port_com[count], port); SET_BDA(com_timeout[count], timeout); return 1; } void serial_setup() { dprintf(3, "init serial\n"); u16 count = 0; count += detect_serial(0x3f8, 0x0a, count); count += detect_serial(0x2f8, 0x0a, count); count += detect_serial(0x3e8, 0x0a, count); count += detect_serial(0x2e8, 0x0a, count); // Equipment word bits 9..11 determing # serial ports u16 eqb = GET_BDA(equipment_list_flags); SET_BDA(equipment_list_flags, (eqb & 0xf1ff) | (count << 9)); } static u16 getComAddr(struct bregs *regs) { if (regs->dx >= 4) { set_fail(regs); return 0; } u16 addr = GET_BDA(port_com[regs->dx]); if (! addr) set_fail(regs); return addr; } // SERIAL - INITIALIZE PORT static void handle_1400(struct bregs *regs) { u16 addr = getComAddr(regs); if (!addr) return; outb(inb(addr+3) | 0x80, addr+3); if ((regs->al & 0xE0) == 0) { outb(0x17, addr); outb(0x04, addr+1); } else { u16 val16 = 0x600 >> ((regs->al & 0xE0) >> 5); outb(val16 & 0xFF, addr); outb(val16 >> 8, addr+1); } outb(regs->al & 0x1F, addr+3); regs->ah = inb(addr+5); regs->al = inb(addr+6); set_success(regs); } // SERIAL - WRITE CHARACTER TO PORT static void handle_1401(struct bregs *regs) { u16 addr = getComAddr(regs); if (!addr) return; u16 timer = GET_BDA(timer_counter); u16 timeout = GET_BDA(com_timeout[regs->dx]); while (((inb(addr+5) & 0x60) != 0x60) && (timeout)) { u16 val16 = GET_BDA(timer_counter); if (val16 != timer) { timer = val16; timeout--; } } if (timeout) outb(regs->al, addr); regs->ah = inb(addr+5); if (!timeout) regs->ah |= 0x80; set_success(regs); } // SERIAL - READ CHARACTER FROM PORT static void handle_1402(struct bregs *regs) { u16 addr = getComAddr(regs); if (!addr) return; u16 timer = GET_BDA(timer_counter); u16 timeout = GET_BDA(com_timeout[regs->dx]); while (((inb(addr+5) & 0x01) == 0) && (timeout)) { u16 val16 = GET_BDA(timer_counter); if (val16 != timer) { timer = val16; timeout--; } } if (timeout) { regs->ah = 0; regs->al = inb(addr); } else { regs->ah = inb(addr+5); } set_success(regs); } // SERIAL - GET PORT STATUS static void handle_1403(struct bregs *regs) { u16 addr = getComAddr(regs); if (!addr) return; regs->ah = inb(addr+5); regs->al = inb(addr+6); set_success(regs); } static void handle_14XX(struct bregs *regs) { // Unsupported set_fail(regs); } // INT 14h Serial Communications Service Entry Point void VISIBLE16 handle_14(struct bregs *regs) { debug_enter(regs, DEBUG_HDL_14); irq_enable(); switch (regs->ah) { case 0x00: handle_1400(regs); break; case 0x01: handle_1401(regs); break; case 0x02: handle_1402(regs); break; case 0x03: handle_1403(regs); break; default: handle_14XX(regs); break; } } /**************************************************************** * LPT ports ****************************************************************/ static u16 detect_parport(u16 port, u8 timeout, u8 count) { // clear input mode outb(inb(port+2) & 0xdf, port+2); outb(0xaa, port); if (inb(port) != 0xaa) // Not present return 0; SET_BDA(port_lpt[count], port); SET_BDA(lpt_timeout[count], timeout); return 1; } void lpt_setup() { dprintf(3, "init lpt\n"); u16 count = 0; count += detect_parport(0x378, 0x14, count); count += detect_parport(0x278, 0x14, count); // Equipment word bits 14..15 determing # parallel ports u16 eqb = GET_BDA(equipment_list_flags); SET_BDA(equipment_list_flags, (eqb & 0x3fff) | (count << 14)); } static u16 getLptAddr(struct bregs *regs) { if (regs->dx >= 3) { set_fail(regs); return 0; } u16 addr = GET_BDA(port_lpt[regs->dx]); if (! addr) set_fail(regs); return addr; } static void lpt_ret(struct bregs *regs, u16 addr, u16 timeout) { u8 val8 = inb(addr+1); regs->ah = (val8 ^ 0x48); if (!timeout) regs->ah |= 0x01; set_success(regs); } // INT 17 - PRINTER - WRITE CHARACTER static void handle_1700(struct bregs *regs) { u16 addr = getLptAddr(regs); if (!addr) return; u16 timeout = GET_BDA(lpt_timeout[regs->dx]) << 8; outb(regs->al, addr); u8 val8 = inb(addr+2); outb(val8 | 0x01, addr+2); // send strobe nop(); outb(val8 & ~0x01, addr+2); while (((inb(addr+1) & 0x40) == 0x40) && (timeout)) timeout--; lpt_ret(regs, addr, timeout); } // INT 17 - PRINTER - INITIALIZE PORT static void handle_1701(struct bregs *regs) { u16 addr = getLptAddr(regs); if (!addr) return; u16 timeout = GET_BDA(lpt_timeout[regs->dx]) << 8; u8 val8 = inb(addr+2); outb(val8 & ~0x04, addr+2); // send init nop(); outb(val8 | 0x04, addr+2); lpt_ret(regs, addr, timeout); } // INT 17 - PRINTER - GET STATUS static void handle_1702(struct bregs *regs) { u16 addr = getLptAddr(regs); if (!addr) return; u16 timeout = GET_BDA(lpt_timeout[regs->dx]) << 8; lpt_ret(regs, addr, timeout); } static void handle_17XX(struct bregs *regs) { // Unsupported set_fail(regs); } // INT17h : Printer Service Entry Point void VISIBLE16 handle_17(struct bregs *regs) { debug_enter(regs, DEBUG_HDL_17); irq_enable(); switch (regs->ah) { case 0x00: handle_1700(regs); break; case 0x01: handle_1701(regs); break; case 0x02: handle_1702(regs); break; default: handle_17XX(regs); break; } }