/*
 * Copyright (c) 1996, 1998, 1999 University of Utah and the Flux Group.
 * All rights reserved.
 * 
 * This file is part of the Flux OSKit.  The OSKit is free software, also known
 * as "open source;" you can redistribute it and/or modify it under the terms
 * of the GNU General Public License (GPL), version 2, as published by the Free
 * Software Foundation (FSF).  To explore alternate licensing terms, contact
 * the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
 * 
 * The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GPL for more details.  You should have
 * received a copy of the GPL along with the OSKit; see the file COPYING.  If
 * not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
 */
/*
 * Default implementation of memory routines.
 */
#include <oskit/c/malloc.h>
#include <oskit/c/stdlib.h>
#include <oskit/dev/dev.h>
#include <oskit/com/mem.h>
#include <oskit/com/services.h>
#include <oskit/machine/base_vm.h>
#include <oskit/machine/physmem.h>

#ifdef KNIT
extern oskit_mem_t *oskit_mem_object;
#define osenv_mem oskit_mem_object
#else
/*
 * Stash a pointer to the memory object.
 */
static oskit_mem_t *osenv_mem;
#endif

/*
 * Allocate memory.
 */
void *
osenv_mem_alloc(oskit_size_t size, osenv_memflags_t flags, unsigned align)
{
	void *p;

#ifndef KNIT
        if (osenv_mem == NULL) {
		if (oskit_lookup_first(&oskit_mem_iid, (void **)&osenv_mem))
			return NULL;
		if (osenv_mem == NULL)
			return NULL;
	}
#endif

	/*
	 * NOTE that osenv flags are the same as oskit_mem flags! 
	 */

	if (align > 1) {
		p = oskit_mem_alloc_aligned(osenv_mem, size, flags, align);
	} else {
		p = oskit_mem_alloc(osenv_mem, size, flags);
	}

	return p;
}

/*
 * Free memory.
 */
void
osenv_mem_free(void *block, osenv_memflags_t flags, oskit_size_t size)
{
	oskit_mem_free(osenv_mem, block, size, flags);
}

/*
 * Map physical memory into kernel virtual space.
 */
int
osenv_mem_map_phys(oskit_addr_t pa, oskit_size_t size, void **addr,
	int flags)
{
	*addr = (void *)phystokv(pa);
	return (0);
}


/*
 * Return the amount of physical RAM in the machine
 */
oskit_addr_t
osenv_mem_phys_max(void)
{
	/*
	 * XXX How can this possibly be useful? It makes no sense on
	 * any machine in which memory does not start at zero, or is
	 * not contiguous.
	 */
	
	return phys_mem_max;
}

/*
 * Return the physical address
 */
oskit_addr_t
osenv_mem_get_phys(oskit_addr_t addr)
{
	return ((oskit_addr_t)kvtophys(addr));
}

oskit_addr_t
osenv_mem_get_virt(oskit_addr_t addr)
{
	return ((oskit_addr_t)phystokv(addr));
}