72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
/*
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* printf for the kernel
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*
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* Changes:
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* Dec 10, 2004 kernel printing to circular buffer (Jorrit N. Herder)
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*
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* This file contains the routines that take care of kernel messages, i.e.,
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* diagnostic output within the kernel. Kernel messages are not directly
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* displayed on the console, because this must be done by the output driver.
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* Instead, the kernel accumulates characters in a buffer and notifies the
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* output driver when a new message is ready.
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*/
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#include "kernel.h"
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#include "proc.h"
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#include <signal.h>
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#define printf kprintf
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#include "../lib/sysutil/kprintf.c"
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#define END_OF_KMESS 0
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FORWARD _PROTOTYPE( void ser_putc, (char c));
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/*===========================================================================*
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* kputc *
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*===========================================================================*/
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PUBLIC void kputc(c)
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int c; /* character to append */
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{
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/* Accumulate a single character for a kernel message. Send a notification
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* to the output driver if an END_OF_KMESS is encountered.
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*/
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if (c != END_OF_KMESS) {
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if (do_serial_debug)
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ser_putc(c);
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kmess.km_buf[kmess.km_next] = c; /* put normal char in buffer */
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if (kmess.km_size < KMESS_BUF_SIZE)
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kmess.km_size += 1;
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kmess.km_next = (kmess.km_next + 1) % KMESS_BUF_SIZE;
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} else {
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int p, outprocs[] = OUTPUT_PROCS_ARRAY;
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for(p = 0; outprocs[p] != NONE; p++) {
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if(isokprocn(outprocs[p]) && !isemptyn(outprocs[p])) {
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send_sig(outprocs[p], SIGKMESS);
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}
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}
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}
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}
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#define COM1_BASE 0x3F8
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#define COM1_THR (COM1_BASE + 0)
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#define LSR_THRE 0x20
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#define COM1_LSR (COM1_BASE + 5)
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PRIVATE void ser_putc(char c)
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{
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int i;
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int lsr, thr;
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return;
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lsr= COM1_LSR;
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thr= COM1_THR;
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for (i= 0; i<100000; i++)
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{
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if (inb(lsr) & LSR_THRE)
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break;
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}
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outb(thr, c);
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}
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