misc.c

linux下从网卡远程启动

#include	"ansiesc.h"
#include	"etherboot.h"
#include	"start32.h"
#include	"misc.h"

#if	ANSIMODE==-1
static int ansion = 0;
#endif

/**************************************************************************
SLEEP
**************************************************************************/
void sleep(int secs)
{
	unsigned long tmo;

	for (tmo = currticks()+secs*TICKS_PER_SEC; currticks() < tmo; )
		/* Nothing */;
}

int getdec(unsigned char **ptr)
{
	char *p = *ptr;
	int ret=0;
	if ((*p < '0') || (*p > '9')) return(-1);
	while ((*p >= '0') && (*p <= '9')) {
		ret = ret*10 + (*p - '0');
		p++;
	}
	*ptr = p;
	return(ret);
}

#if	ANSIMODE==-1
void
ansiswitch(int i)
{
	ansion = i;
}
#endif

void
putchar(int c)
{
#ifdef	CONSOLE_CRT
#if	ANSIMODE==-1	/* choose by variable */
	if (ansion)
		ansi_putc(c);
	else {
		if (c == '\n')
			console_putc('\r');
		console_putc(c);
	}
#elif	ANSIMODE==1	/* always ANSI */
	ansi_putc(c);
#else			/* always console */
	if (c == '\n')
		console_putc('\r');
	console_putc(c);
#endif
#endif

#ifdef	CONSOLE_SERIAL
	if (c == '\n')
		serial_putc('\r');
	serial_putc(c);
#endif
}

/**************************************************************************
GETCHAR - Read the next character from input device WITHOUT ECHO
**************************************************************************/
int getchar(void)
{
	int c = 256;

	do {
#ifdef	POWERSAVE
		/* Doze for a while (until the next interrupt).  This works
		 * fine, because the keyboard is interrupt-driven, and the
		 * timer interrupt (approx. every 50msec) takes care of the
		 * serial port, which is read by polling.  This reduces the
		 * power dissipation of a modern CPU considerably, and also
		 * makes Etherboot waiting for user interaction waste a lot
		 * less CPU time in a VMware session.  */
		cpu_nap();
#endif	/* POWERSAVE */
#ifdef	CONSOLE_CRT
		if (console_ischar())
			c = console_getc();
#endif
#ifdef	CONSOLE_SERIAL
		if (serial_ischar())
			c = serial_getc();
#endif
	} while (c==256);
	if (c == '\r')
		c = '\n';
	return c;
}

int iskey(void)
{
#ifdef	CONSOLE_CRT
	if (console_ischar())
		return 1;
#endif
#ifdef	CONSOLE_SERIAL
	if (serial_ischar())
		return 1;
#endif
	return 0;
}