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/* $OpenBSD: crt.c,v 1.6 2006/05/16 22:51:30 miod Exp $ */
#include <sys/types.h>
#include <machine/prom.h>
#include "stand.h"
#include "libbug.h"
struct mvmeprom_args bugargs;
__asm__ (".text");
__asm__ (STACK_ASM_OP); /* initial sp value */
__asm__ (".long _start"); /* initial ip value */
extern void main(void);
void
start(u_int dev_lun, u_int ctrl_lun, u_int flags, u_int ctrl_addr, u_int entry,
u_int conf_blk, char *arg_start, char *arg_end)
{
extern u_int edata, end;
char *nbarg_start;
char *nbarg_end;
u_int dummy;
/*
* Save r10 and r11 first. We can't put declare them as arguments
* since the normal calling convention would put them on the stack.
*/
__asm__ __volatile__ ("or %0, r0, r10" : "=r" (nbarg_start) : :
"r10", "r11");
__asm__ __volatile__ ("or %0, r0, r11" : "=r" (nbarg_end) : :
"r10", "r11");
/*
* This code enables the SFU1 and is used for single stage
* bootstraps or the first stage of a two stage bootstrap.
* Do not use lower registers to enable the SFU1. This wipes out
* the args. Not cool at all... r25 seems free.
*/
__asm__ __volatile__ ("ldcr %0, cr1" : "=r" (dummy));
__asm__ __volatile__ ("clr %0, %0, 1<3>; stcr %0, cr1" : "+r" (dummy));
memset(&edata, 0, ((int)&end - (int)&edata));
bugargs.dev_lun = dev_lun;
bugargs.ctrl_lun = ctrl_lun;
bugargs.flags = flags;
bugargs.ctrl_addr = ctrl_addr;
bugargs.entry = entry;
bugargs.conf_blk = conf_blk;
bugargs.arg_start = arg_start;
bugargs.arg_end = arg_end;
bugargs.nbarg_start = nbarg_start;
bugargs.nbarg_end = nbarg_end;
*bugargs.arg_end = '\0';
main();
_rtt();
/* NOTREACHED */
}
void
__main()
{
}
void
bugexec(void (*addr)())
{
(*addr)(bugargs.dev_lun, bugargs.ctrl_lun, bugargs.flags,
bugargs.ctrl_addr, bugargs.entry, bugargs.conf_blk,
bugargs.arg_start, bugargs.arg_end);
printf("bugexec: %p returned!\n", addr);
_rtt();
}
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