phys_lmm.h

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/*
 * phys_lmm.h
 * Modified for use in 15-410 at CMU
 * Zachary Anderson(zra)
 */

/*
 * Copyright (c) 1995, 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 [e-mail] or [phone].
 * 
 * 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.
 */

/*
 * PC-specific flag bits and priority values
 * for the List Memory Manager (LMM)
 * relevant for kernels managing physical memory.
 */

#ifndef _PHYS_LMM_H_
#define _PHYS_LMM_H_

/*
 * The base memory pool is contained in the malloc_lmm.
 * Wrongly named, malloc operates in terms of the memory object.
 */
extern struct lmm malloc_lmm;

/*
 * <1MB memory is most precious, then <16MB memory, then high memory.
 * Assign priorities to each region accordingly
 * so that high memory will be used first when possible,
 * then 16MB memory, then 1MB memory.
 */
#define LMM_PRI_1MB	-2
#define LMM_PRI_16MB	-1
#define LMM_PRI_HIGH	0

/*
 * For memory <1MB, both LMMF_1MB and LMMF_16MB will be set.
 * For memory from 1MB to 16MB, only LMMF_16MB will be set.
 * For all memory higher than that, neither will be set.
 */
#define LMMF_1MB	0x01
#define LMMF_16MB	0x02

/*
 * This routine sets up the malloc_lmm with three regions,
 * one for each of the memory types above.
 * You can then call phys_lmm_add() to add memory to those regions.
 */
void phys_lmm_init(void);

/*
 * Call one of these routines to add a chunk of physical memory found
 * to the appropriate region(s) on the malloc_lmm.
 * The provided memory block may be arbitrarily aligned
 * and may cross region boundaries (e.g. the 16MB boundary);
 * it will be shrunken and split apart as necessary.
 * Note that these routines take _physical_ addresses,
 * not virtual addresses as the underlying LMM routines do.
 */
void phys_lmm_add(unsigned int min_pa, unsigned int size);
void i16_phys_lmm_add(unsigned int min_pa, unsigned int size);


/*
 * The above routines keep this variable up-to-date
 * so that it always records the highest physical memory address seen so far;
 * i.e. the end address of the highest free block added to the free list.
 * After all physical memory is found and collected on the free list,
 * this variable will contain the highest physical memory address
 * that the kernel should ever have to deal with.
 */
extern unsigned int phys_mem_max;

#endif /* _PHYS_LMM_H_ */