xref: /titanic_44/usr/src/psm/promif/ieee1275/sun4/prom_init.c (revision 986fd29a0dc13f7608ef7f508f6e700bd7bc2720)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <sys/promif.h>
#include <sys/promimpl.h>
#include <sys/platform_module.h>

int	obp_romvec_version = -1;  /* -1 rsrvd for non-obp sunromvec */
int	prom_aligned_allocator = 0; /* Not needed for 1275 */
void	*p1275cif;		/* 1275 Client interface handler */

#ifdef PROMIF_DEBUG
int promif_debug = 0;
#endif /* PROMIF_DEBUG */

/*
 * This is the string we use to print out "panic" level messages,
 * so that it's easier to identify who's doing the complaining.
 */
#define	PROMIF_CLNTNAMELEN	16
char	promif_clntname[PROMIF_CLNTNAMELEN];

/*
 * The plat_setprop_enter() and plat_setprop_exit() routines are actually
 * defined as #pragma weak symbols, which confuses lint since it does not grok
 * #pragma weak and thus thinks the routines are used but not defined.  Until
 * lint is enhanced, we workaround this with the following stubs.
 */
#ifdef	__lint
void
plat_setprop_enter(void)
{}

void
plat_setprop_exit(void)
{}
#endif

/*
 * This 'do-nothing' function is called immediately before and immediately
 * after entry to the PROM.  Some standalones (e.g. the kernel)
 * may replace this routine with their own.
 */
static void
default_prepost_prom(void)
{}

/*
 * Every standalone that wants to use this library must call
 * prom_init() before any of the other routines can be called.
 * The only state it creates is the obp_romvec_version variable,
 * and the prom_aligned_allocator variable (plus the default pre-
 * and post-prom handlers, and the clientname string)
 *
 */
void
prom_init(char *pgmname, void *p1275cookie)
{
	/*
	 * Allow implementation to validate input argument.
	 */
	p1275cif = p1275_cif_init(p1275cookie);

	if ((p1275cif == NULL)) {
		prom_fatal_error("promif: No interface!");
		/*NOTREACHED*/
	}

	/*
	 * Initialize the "clientname" string with the string we've
	 * been handed by the standalone
	 */
	(void) prom_strncpy(promif_clntname, pgmname, PROMIF_CLNTNAMELEN - 1);
	promif_clntname[PROMIF_CLNTNAMELEN - 1] = '\0';

	obp_romvec_version = OBP_PSEUDO_ROMVEC_VERSION;

	/*
	 * Add default pre- and post-prom handlers
	 * (We add this null handler to avoid the numerous tests
	 * that would otherwise have to be included around every call)
	 */
	(void) prom_set_preprom(default_prepost_prom);
	(void) prom_set_postprom(default_prepost_prom);
}

/*
 * Fatal promif internal error, not an external interface
 */

/*ARGSUSED*/
void
prom_fatal_error(const char *errormsg)
{

	volatile int	zero = 0;
	volatile int	i = 1;

	/*
	 * No prom interface, try to cause a trap by
	 * dividing by zero, leaving the message in %i0.
	 */

	i = i / zero;
	/*NOTREACHED*/
}