NetBSD/sys/arch/alpha/stand/common/prom.c

127 lines
2.7 KiB
C

/* $NetBSD: prom.c,v 1.5 1998/10/15 01:02:15 ross Exp $ */
/*
* Mach Operating System
* Copyright (c) 1992 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
#include <sys/types.h>
#include <machine/prom.h>
#include <machine/rpb.h>
#include "common.h"
int console;
static int test_getchar(prom_return_t *, int *);
void
init_prom_calls()
{
extern struct prom_vec prom_dispatch_v;
struct rpb *r;
struct crb *c;
char buf[4];
r = (struct rpb *)HWRPB_ADDR;
c = (struct crb *)((u_int8_t *)r + r->rpb_crb_off);
prom_dispatch_v.routine_arg = c->crb_v_dispatch;
prom_dispatch_v.routine = c->crb_v_dispatch->entry_va;
/* Look for console tty. */
prom_getenv(PROM_E_TTY_DEV, buf, 4);
console = buf[0] - '0';
}
static int
test_getchar(xret, xc)
prom_return_t *xret;
int *xc;
{
xret->bits = prom_dispatch(PROM_R_GETC, console);
*xc = xret->u.retval;
return xret->u.status == 0 || xret->u.status == 1;
}
int
getchar()
{
int c;
prom_return_t ret;
for (;;) {
if (test_getchar(&ret, &c)) {
if (c == 3)
halt();
return c;
}
}
}
void
putchar(c)
int c;
{
prom_return_t ret;
char cbuf;
int typed_c;
if (c == '\r' || c == '\n') {
cbuf = '\r';
do {
ret.bits = prom_dispatch(PROM_R_PUTS, console,
&cbuf, 1);
} while ((ret.u.retval & 1) == 0);
cbuf = '\n';
} else
cbuf = c;
do {
ret.bits = prom_dispatch(PROM_R_PUTS, console, &cbuf, 1);
} while ((ret.u.retval & 1) == 0);
ret.bits = prom_dispatch(PROM_R_GETC, console);
if (ret.u.status == 0 || ret.u.status == 1)
if (ret.u.retval == 3)
halt();
if (test_getchar(&ret, &typed_c))
if (typed_c == 3)
halt();
}
int
prom_getenv(id, buf, len)
int id, len;
char *buf;
{
prom_return_t ret;
ret.bits = prom_dispatch(PROM_R_GETENV, id, buf, len-1);
if (ret.u.status & 0x4)
ret.u.retval = 0;
buf[ret.u.retval] = '\0';
return (ret.u.retval);
}