diff options
author | 2015-08-28 09:58:54 +0800 | |
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committer | 2015-09-01 12:44:00 +0800 | |
commit | e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb (patch) | |
tree | 66b09f592c55df2878107a468a91d21506104d3f /qemu/roms/seabios/src/serial.c | |
parent | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (diff) |
Add qemu 2.4.0
Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Diffstat (limited to 'qemu/roms/seabios/src/serial.c')
-rw-r--r-- | qemu/roms/seabios/src/serial.c | 317 |
1 files changed, 317 insertions, 0 deletions
diff --git a/qemu/roms/seabios/src/serial.c b/qemu/roms/seabios/src/serial.c new file mode 100644 index 000000000..88349c8a9 --- /dev/null +++ b/qemu/roms/seabios/src/serial.c @@ -0,0 +1,317 @@ +// 16bit code to handle serial and printer services. +// +// Copyright (C) 2008,2009 Kevin O'Connor <kevin@koconnor.net> +// Copyright (C) 2002 MandrakeSoft S.A. +// +// This file may be distributed under the terms of the GNU LGPLv3 license. + +#include "biosvar.h" // SET_BDA +#include "bregs.h" // struct bregs +#include "hw/serialio.h" // SEROFF_IER +#include "output.h" // debug_enter +#include "romfile.h" // romfile_loadint +#include "stacks.h" // yield +#include "util.h" // serial_setup + + +/**************************************************************** + * COM ports + ****************************************************************/ + +static u16 +detect_serial(u16 port, u8 timeout, u8 count) +{ + if (CONFIG_DEBUG_SERIAL && port == CONFIG_DEBUG_SERIAL_PORT + && !romfile_loadint("etc/advertise-serial-debug-port", 1)) + return 0; + outb(0x02, port+SEROFF_IER); + u8 ier = inb(port+SEROFF_IER); + if (ier != 0x02) + return 0; + u8 iir = inb(port+SEROFF_IIR); + if ((iir & 0x3f) != 0x02) + return 0; + + outb(0x00, port+SEROFF_IER); + SET_BDA(port_com[count], port); + SET_BDA(com_timeout[count], timeout); + return 1; +} + +void +serial_setup(void) +{ + if (! CONFIG_SERIAL) + return; + dprintf(3, "init serial\n"); + + u16 count = 0; + count += detect_serial(PORT_SERIAL1, 0x0a, count); + count += detect_serial(PORT_SERIAL2, 0x0a, count); + count += detect_serial(PORT_SERIAL3, 0x0a, count); + count += detect_serial(PORT_SERIAL4, 0x0a, count); + dprintf(1, "Found %d serial ports\n", count); + + // Equipment word bits 9..11 determing # serial ports + set_equipment_flags(0xe00, count << 9); +} + +static u16 +getComAddr(struct bregs *regs) +{ + if (regs->dx >= 4) { + set_invalid(regs); + return 0; + } + u16 addr = GET_BDA(port_com[regs->dx]); + if (! addr) + set_invalid(regs); + return addr; +} + +// SERIAL - INITIALIZE PORT +static void +handle_1400(struct bregs *regs) +{ + u16 addr = getComAddr(regs); + if (!addr) + return; + outb(inb(addr+SEROFF_LCR) | 0x80, addr+SEROFF_LCR); + if ((regs->al & 0xE0) == 0) { + outb(0x17, addr+SEROFF_DLL); + outb(0x04, addr+SEROFF_DLH); + } else { + u16 val16 = 0x600 >> ((regs->al & 0xE0) >> 5); + outb(val16 & 0xFF, addr+SEROFF_DLL); + outb(val16 >> 8, addr+SEROFF_DLH); + } + outb(regs->al & 0x1F, addr+SEROFF_LCR); + regs->ah = inb(addr+SEROFF_LSR); + regs->al = inb(addr+SEROFF_MSR); + set_success(regs); +} + +// SERIAL - WRITE CHARACTER TO PORT +static void +handle_1401(struct bregs *regs) +{ + u16 addr = getComAddr(regs); + if (!addr) + return; + u32 end = irqtimer_calc_ticks(GET_BDA(com_timeout[regs->dx])); + for (;;) { + u8 lsr = inb(addr+SEROFF_LSR); + if ((lsr & 0x60) == 0x60) { + // Success - can write data + outb(regs->al, addr+SEROFF_DATA); + // XXX - reread lsr? + regs->ah = lsr; + break; + } + if (irqtimer_check(end)) { + // Timed out - can't write data. + regs->ah = lsr | 0x80; + break; + } + yield(); + } + set_success(regs); +} + +// SERIAL - READ CHARACTER FROM PORT +static void +handle_1402(struct bregs *regs) +{ + u16 addr = getComAddr(regs); + if (!addr) + return; + u32 end = irqtimer_calc_ticks(GET_BDA(com_timeout[regs->dx])); + for (;;) { + u8 lsr = inb(addr+SEROFF_LSR); + if (lsr & 0x01) { + // Success - can read data + regs->al = inb(addr+SEROFF_DATA); + regs->ah = lsr; + break; + } + if (irqtimer_check(end)) { + // Timed out - can't read data. + regs->ah = lsr | 0x80; + break; + } + yield(); + } + 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+SEROFF_LSR); + regs->al = inb(addr+SEROFF_MSR); + set_success(regs); +} + +static void +handle_14XX(struct bregs *regs) +{ + set_unimplemented(regs); +} + +// INT 14h Serial Communications Service Entry Point +void VISIBLE16 +handle_14(struct bregs *regs) +{ + debug_enter(regs, DEBUG_HDL_14); + if (! CONFIG_SERIAL) { + handle_14XX(regs); + return; + } + + 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(void) +{ + if (! CONFIG_LPT) + return; + dprintf(3, "init lpt\n"); + + u16 count = 0; + count += detect_parport(PORT_LPT1, 0x14, count); + count += detect_parport(PORT_LPT2, 0x14, count); + dprintf(1, "Found %d lpt ports\n", count); + + // Equipment word bits 14..15 determing # parallel ports + set_equipment_flags(0xc000, count << 14); +} + +static u16 +getLptAddr(struct bregs *regs) +{ + if (regs->dx >= 3) { + set_invalid(regs); + return 0; + } + u16 addr = GET_BDA(port_lpt[regs->dx]); + if (! addr) + set_invalid(regs); + return addr; +} + +// INT 17 - PRINTER - WRITE CHARACTER +static void +handle_1700(struct bregs *regs) +{ + u16 addr = getLptAddr(regs); + if (!addr) + return; + + u32 end = irqtimer_calc_ticks(GET_BDA(lpt_timeout[regs->dx])); + + outb(regs->al, addr); + u8 val8 = inb(addr+2); + outb(val8 | 0x01, addr+2); // send strobe + udelay(5); + outb(val8 & ~0x01, addr+2); + + for (;;) { + u8 v = inb(addr+1); + if (!(v & 0x40)) { + // Success + regs->ah = v ^ 0x48; + break; + } + if (irqtimer_check(end)) { + // Timeout + regs->ah = (v ^ 0x48) | 0x01; + break; + } + yield(); + } + + set_success(regs); +} + +// INT 17 - PRINTER - INITIALIZE PORT +static void +handle_1701(struct bregs *regs) +{ + u16 addr = getLptAddr(regs); + if (!addr) + return; + + u8 val8 = inb(addr+2); + outb(val8 & ~0x04, addr+2); // send init + udelay(5); + outb(val8 | 0x04, addr+2); + + regs->ah = inb(addr+1) ^ 0x48; + set_success(regs); +} + +// INT 17 - PRINTER - GET STATUS +static void +handle_1702(struct bregs *regs) +{ + u16 addr = getLptAddr(regs); + if (!addr) + return; + regs->ah = inb(addr+1) ^ 0x48; + set_success(regs); +} + +static void +handle_17XX(struct bregs *regs) +{ + set_unimplemented(regs); +} + +// INT17h : Printer Service Entry Point +void VISIBLE16 +handle_17(struct bregs *regs) +{ + debug_enter(regs, DEBUG_HDL_17); + if (! CONFIG_LPT) { + handle_17XX(regs); + return; + } + + 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; + } +} |