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/* $OpenBSD: crt.c,v 1.3 2013/10/16 16:59:34 miod Exp $ */
#include <sys/types.h>
#include <machine/prom.h>
#include "stand.h"
extern void boot(char *, int, int, int);
/*
* This is the boot code entry point.
* Note that we do not bother to set r31, and use the default value supplied
* by the PROM, which is the top of memory, minus the PROM data area (usually
* 128KB).
*/
void
start(char *args, int dev, int unit, int lun)
{
extern int edata, end;
/*
* This code enables the SFU1 and is used for single stage
* bootstraps or the first stage of a two stage bootstrap.
* Do not use any low register to enable the SFU1. This wipes out
* the args. Not cool at all... r25 seems free.
*/
asm(" ldcr %%r25,%%cr1" ::: "r25");
asm(" clr %r25,%r25,1<3>"); /* bit 3 is SFU1D */
asm(" stcr %r25,%cr1");
memset(&edata, 0, ((int)&end - (int)&edata));
boot(args, dev, unit, lun);
_rtt();
/* NOTREACHED */
}
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