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/*
* vdprintf.c
*/
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <inttypes.h>
#include <sys/io.h>
#include <sys/cpu.h>
#undef DEBUG
#define DEBUG 1
#include <dprintf.h>
#define BUFFER_SIZE 32768
static const uint16_t debug_base = 0x03f8; /* I/O base address */
void vdprintf(const char *format, va_list ap)
{
int rv;
char buffer[BUFFER_SIZE];
char *p;
rv = vsnprintf(buffer, BUFFER_SIZE, format, ap);
if (rv < 0)
return;
if (rv > BUFFER_SIZE - 1)
rv = BUFFER_SIZE - 1;
/*
* This unconditionally outputs to a serial port at 0x3f8 regardless of
* if one is enabled or not (this means we don't have to enable the real
* serial console and therefore get conflicting output.)
*/
p = buffer;
while (rv--) {
while ((inb(debug_base+5) & 0x20) == 0)
cpu_relax();
outb(*p++, debug_base);
}
}
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