diff options
Diffstat (limited to 'contrib/syslinux/latest/com32/gdbstub/serial.c')
| -rw-r--r-- | contrib/syslinux/latest/com32/gdbstub/serial.c | 193 |
1 files changed, 0 insertions, 193 deletions
diff --git a/contrib/syslinux/latest/com32/gdbstub/serial.c b/contrib/syslinux/latest/com32/gdbstub/serial.c deleted file mode 100644 index 8c69b02..0000000 --- a/contrib/syslinux/latest/com32/gdbstub/serial.c +++ /dev/null @@ -1,193 +0,0 @@ -/* - * The serial port interface routines implement a simple polled i/o - * interface to a standard serial port. Due to the space restrictions - * for the boot blocks, no BIOS support is used (since BIOS requires - * expensive real/protected mode switches), instead the rudimentary - * BIOS support is duplicated here. - * - * The base address and speed for the i/o port are passed from the - * Makefile in the COMCONSOLE and CONSPEED preprocessor macros. The - * line control parameters are currently hard-coded to 8 bits, no - * parity, 1 stop bit (8N1). This can be changed in init_serial(). - */ - -#include <stddef.h> -#include <sys/io.h> -#include "serial.h" - -/* Set default values if none specified */ - -#ifndef COMCONSOLE -#define COMCONSOLE 0x3f8 -#endif - -#ifndef COMSPEED -#define COMSPEED 9600 -#endif - -#ifndef COMDATA -#define COMDATA 8 -#endif - -#ifndef COMPARITY -#define COMPARITY 0 -#endif - -#ifndef COMSTOP -#define COMSTOP 1 -#endif - -#undef UART_BASE -#define UART_BASE ( COMCONSOLE ) - -#undef UART_BAUD -#define UART_BAUD ( COMSPEED ) - -#if ((115200%UART_BAUD) != 0) -#error Bad ttys0 baud rate -#endif - -#define COMBRD (115200/UART_BAUD) - -/* Line Control Settings */ -#define UART_LCS ( ( ( (COMDATA) - 5 ) << 0 ) | \ - ( ( (COMPARITY) ) << 3 ) | \ - ( ( (COMSTOP) - 1 ) << 2 ) ) - -/* Data */ -#define UART_RBR 0x00 -#define UART_TBR 0x00 - -/* Control */ -#define UART_IER 0x01 -#define UART_IIR 0x02 -#define UART_FCR 0x02 -#define UART_LCR 0x03 -#define UART_MCR 0x04 -#define UART_DLL 0x00 -#define UART_DLM 0x01 - -/* Status */ -#define UART_LSR 0x05 -#define UART_LSR_TEMPT 0x40 /* Transmitter empty */ -#define UART_LSR_THRE 0x20 /* Transmit-hold-register empty */ -#define UART_LSR_BI 0x10 /* Break interrupt indicator */ -#define UART_LSR_FE 0x08 /* Frame error indicator */ -#define UART_LSR_PE 0x04 /* Parity error indicator */ -#define UART_LSR_OE 0x02 /* Overrun error indicator */ -#define UART_LSR_DR 0x01 /* Receiver data ready */ - -#define UART_MSR 0x06 -#define UART_SCR 0x07 - -#define uart_readb(addr) inb(addr) -#define uart_writeb(val,addr) outb((val),(addr)) - -/* - * void serial_putc(int ch); - * Write character `ch' to port UART_BASE. - */ -void serial_putc(int ch) -{ - int status; - for (;;) { - status = uart_readb(UART_BASE + UART_LSR); - if (status & UART_LSR_THRE) { - /* TX buffer emtpy */ - uart_writeb(ch, UART_BASE + UART_TBR); - break; - } - } -} - -/* - * int serial_getc(void); - * Read a character from port UART_BASE. - */ -int serial_getc(void) -{ - int status; - int ch; - do { - status = uart_readb(UART_BASE + UART_LSR); - } while ((status & 1) == 0); - ch = uart_readb(UART_BASE + UART_RBR); /* fetch (first) character */ - ch &= 0x7f; /* remove any parity bits we get */ - if (ch == 0x7f) { /* Make DEL... look like BS */ - ch = 0x08; - } - return ch; -} - -/* - * int serial_init(void); - * Initialize port UART_BASE to speed COMSPEED, line settings 8N1. - */ -void serial_init(void) -{ - int status; - int divisor, lcs; - - divisor = COMBRD; - lcs = UART_LCS; - -#ifdef COMPRESERVE - lcs = uart_readb(UART_BASE + UART_LCR) & 0x7f; - uart_writeb(0x80 | lcs, UART_BASE + UART_LCR); - divisor = - (uart_readb(UART_BASE + UART_DLM) << 8) | uart_readb(UART_BASE + - UART_DLL); - uart_writeb(lcs, UART_BASE + UART_LCR); -#endif - - /* Set Baud Rate Divisor to COMSPEED, and test to see if the - * serial port appears to be present. - */ - uart_writeb(0x80 | lcs, UART_BASE + UART_LCR); - uart_writeb(0xaa, UART_BASE + UART_DLL); - if (uart_readb(UART_BASE + UART_DLL) != 0xaa) { - goto out; - } - uart_writeb(0x55, UART_BASE + UART_DLL); - if (uart_readb(UART_BASE + UART_DLL) != 0x55) { - goto out; - } - uart_writeb(divisor & 0xff, UART_BASE + UART_DLL); - if (uart_readb(UART_BASE + UART_DLL) != (divisor & 0xff)) { - goto out; - } - uart_writeb(0xaa, UART_BASE + UART_DLM); - if (uart_readb(UART_BASE + UART_DLM) != 0xaa) { - goto out; - } - uart_writeb(0x55, UART_BASE + UART_DLM); - if (uart_readb(UART_BASE + UART_DLM) != 0x55) { - goto out; - } - uart_writeb((divisor >> 8) & 0xff, UART_BASE + UART_DLM); - if (uart_readb(UART_BASE + UART_DLM) != ((divisor >> 8) & 0xff)) { - goto out; - } - uart_writeb(lcs, UART_BASE + UART_LCR); - - /* disable interrupts */ - uart_writeb(0x0, UART_BASE + UART_IER); - - /* disable fifo's */ - uart_writeb(0x00, UART_BASE + UART_FCR); - - /* Set clear to send, so flow control works... */ - uart_writeb((1 << 1), UART_BASE + UART_MCR); - - /* Flush the input buffer. */ - do { - /* rx buffer reg - * throw away (unconditionally the first time) - */ - (void)uart_readb(UART_BASE + UART_RBR); - /* line status reg */ - status = uart_readb(UART_BASE + UART_LSR); - } while (status & UART_LSR_DR); -out: - return; -} |