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|
#include <bsp.h>
#if 1
static void outbyte(char c) {
volatile char * const pc16550 = (char *) IO_TO_LOCAL(0x03f8);
# define THR 0
# define LSR 5
# define THRE 0x20
while ((pc16550[LSR] & THRE) == 0) {
;
}
pc16550[THR] = c;
}
#else
/* printk to memory for debugging */
static void outbyte(char c) {
static char *memory_log = (char *) 0x01F00000;
*memory_log++ = c;
if (memory_log >= (char *) 0x01F80000) {
memory_log--;
}
}
#endif
/*-------------------------------------------------------------------------+
| printk.c v1.1 - PC386 BSP - 1997/08/07
+--------------------------------------------------------------------------+
| (C) Copyright 1997 -
| - NavIST Group - Real-Time Distributed Systems and Industrial Automation
|
| http://pandora.ist.utl.pt
|
| Instituto Superior Tecnico * Lisboa * PORTUGAL
+--------------------------------------------------------------------------+
| Disclaimer:
|
| This file is provided "AS IS" without warranty of any kind, either
| expressed or implied.
+--------------------------------------------------------------------------+
| This code is based on code by: Jose Rufino - IST
|
| $Id$
+--------------------------------------------------------------------------*/
#include <stdarg.h>
/*-------------------------------------------------------------------------+
| Function: printNum
| Description: print number in a given base.
| Global Variables: None.
| Arguments: num - number to print, base - base used to print the number.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
static void printNum(long unsigned int num, int base, int sign, int width,
int zerofill) {
long unsigned int n;
int count, negative = 0;
char toPrint[80];
char *digits = "0123456789ABCDEF";
if (width > sizeof(toPrint)) {
width = sizeof(toPrint);
}
if ((sign == 1) && ((long) num < 0)) {
negative = 1;
num = -num;
}
count = 0;
while ((n = num / base) > 0) {
toPrint[count++] = digits[num - (n * base)];
num = n;
}
toPrint[count++] = digits[num];
if (count + negative < width) {
/* this needs to be padded out to width */
if (zerofill) {
while (count + negative < width) {
toPrint[count++] = '0';
}
if (negative) {
toPrint[count++] = '-';
}
} else {
if (negative) {
toPrint[count++] = '-';
}
while (count < width) {
toPrint[count++] = ' ';
}
}
} else if (negative) {
toPrint[count++] = '-';
}
for (n = 0; n < count; n++) {
outbyte(toPrint[count - (n + 1)]);
}
}
/*-------------------------------------------------------------------------+
| Function: printk
| Description: a simplified version of printf intended for use when the
console is not yet initialized or in ISR's.
| Global Variables: None.
| Arguments: as in printf: fmt - format string, ... - unnamed arguments.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
int printk_enabled = 1;
void printk(char *fmt, ...) {
va_list ap; /* points to each unnamed argument in turn */
char c, *str;
int lflag, base, sign, width, zero;
/* disable interrupts??? */
if (printk_enabled) {
va_start(ap, fmt); /* make ap point to 1st unnamed arg */
for (; *fmt != '\0'; fmt++) {
lflag = 0;
base = 0;
sign = 0;
width = 0;
if (*fmt == '\n') {
outbyte('\r');
}
if (*fmt == '%') {
c = *++fmt;
if (c == '0') {
zero = 1;
c = *++fmt;
} else {
zero = 0;
}
for (; c >= '0' && c <= '9'; c = *++fmt) {
width = width * 10 + (c - '0');
}
if (c == 'l') {
lflag = 1;
c = *++fmt;
}
switch (c) {
case 'o':
case 'O':
base = 8;
sign = 0;
break;
case 'd':
case 'D':
base = 10;
sign = 1;
break;
case 'u':
case 'U':
base = 10;
sign = 0;
break;
case 'x':
case 'X':
base = 16;
sign = 0;
break;
case 's':
for (str = va_arg(ap, char *); *str; str++) {
outbyte(*str);
width--;
}
while (width-- > 0) {
outbyte(' ');
}
break;
case 'c':
outbyte(va_arg(ap, int));
break;
default:
outbyte(c);
break;
}
if (base) {
printNum(lflag ? va_arg(ap, long int) :
(long int) va_arg(ap, int), base, sign, width, zero);
}
} else {
outbyte(*fmt);
}
}
va_end(ap); /* clean up when done */
/* enable interrupts??? */
}
}
|
