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#define NB_COLS 80
#define NB_ROWS 25
#define VIDEO_BUFFER 0xB8000
/* XXX doest not always handle memory overlaps */
static void my_memmove(void *_dest, const void *_src, int n)
{
char *dest = _dest;
const char *src = _src;
for (int i = 0; i < n; ++i) {
dest[i] = src[i];
}
}
static void my_memset(void *_dest, int c, int n)
{
char *dest = _dest;
for (int i = 0; i < n; ++i) {
dest[i] = c;
}
}
int printk(const char *str)
{
static const long int offset = VIDEO_BUFFER;
static char *addr = (char *) VIDEO_BUFFER;
int count = 0;
for (int i = 0; str[i]; ++i) {
/* TODO add the serial port handling */
if ((long)addr >= offset + NB_COLS * NB_ROWS) {
/* shift up */
addr -= NB_COLS;
my_memmove((void *)offset, (void *)offset + NB_COLS, NB_COLS * (NB_ROWS - 1));
my_memset((void *)offset + NB_COLS * (NB_ROWS - 1), ' ', NB_ROWS);
}
*addr++ = str[i];
++count;
}
return count;
}
int main(void)
{
}
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