| 1 | /*
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| 2 | * printf for the kernel
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| 3 | *
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| 4 | * Changes:
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| 5 | * Dec 10, 2004 kernel printing to circular buffer (Jorrit N. Herder)
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| 6 | *
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| 7 | * This file contains the routines that take care of kernel messages, i.e.,
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| 8 | * diagnostic output within the kernel. Kernel messages are not directly
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| 9 | * displayed on the console, because this must be done by the output driver.
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| 10 | * Instead, the kernel accumulates characters in a buffer and notifies the
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| 11 | * output driver when a new message is ready.
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| 12 | */
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| 13 |
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| 14 | #include "kernel.h"
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| 15 | #include "proc.h"
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| 16 | #include <signal.h>
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| 17 |
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| 18 | #define printf kprintf
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| 19 |
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| 20 | #include "../lib/sysutil/kprintf.c"
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| 21 |
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| 22 | #define END_OF_KMESS 0
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| 23 | FORWARD _PROTOTYPE( void ser_putc, (char c));
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| 24 |
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| 25 | /*===========================================================================*
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| 26 | * kputc *
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| 27 | *===========================================================================*/
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| 28 | PUBLIC void kputc(c)
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| 29 | int c; /* character to append */
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| 30 | {
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| 31 | /* Accumulate a single character for a kernel message. Send a notification
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| 32 | * to the output driver if an END_OF_KMESS is encountered.
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| 33 | */
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| 34 | if (c != END_OF_KMESS) {
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| 35 | if (do_serial_debug)
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| 36 | ser_putc(c);
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| 37 | kmess.km_buf[kmess.km_next] = c; /* put normal char in buffer */
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| 38 | if (kmess.km_size < KMESS_BUF_SIZE)
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| 39 | kmess.km_size += 1;
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| 40 | kmess.km_next = (kmess.km_next + 1) % KMESS_BUF_SIZE;
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| 41 | } else {
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| 42 | int p, outprocs[] = OUTPUT_PROCS_ARRAY;
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| 43 | for(p = 0; outprocs[p] != NONE; p++) {
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| 44 | if(isokprocn(outprocs[p]) && !isemptyn(outprocs[p])) {
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| 45 | send_sig(outprocs[p], SIGKMESS);
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| 46 | }
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| 47 | }
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| 48 | }
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| 49 | }
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| 50 |
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| 51 | #define COM1_BASE 0x3F8
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| 52 | #define COM1_THR (COM1_BASE + 0)
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| 53 | #define LSR_THRE 0x20
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| 54 | #define COM1_LSR (COM1_BASE + 5)
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| 55 |
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| 56 | PRIVATE void ser_putc(char c)
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| 57 | {
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| 58 | int i;
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| 59 | int lsr, thr;
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| 60 |
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| 61 | return;
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| 62 |
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| 63 | lsr= COM1_LSR;
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| 64 | thr= COM1_THR;
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| 65 | for (i= 0; i<100000; i++)
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| 66 | {
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| 67 | if (inb(lsr) & LSR_THRE)
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| 68 | break;
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| 69 | }
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| 70 | outb(thr, c);
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| 71 | }
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