mem.h

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//  This file is part of MANTIS OS, Operating System
//  See http://mantis.cs.colorado.edu/
//
//  Copyright (C) 2003,2004,2005 University of Colorado, Boulder
//
//  This program is free software; you can redistribute it and/or
//  modify it under the terms of the mos license (see file LICENSE)

/** @file kernel/include/mem.h
 * @brief Memory management system. 
 * 
 * Memory management system for allocating thread stack space in memory. We keep a linked list of free memory blocks and use a best fit match to allocate new blocks.
 * @author Brian Shucker
 * @author Edited: Jeff Rose (Converted generic heap to our specific memory 
 * manager.)
 * @date Created: 11/02/1999
 */

/** @brief A node of managed memory */
typedef struct node_s {
   /** @brief Size of blocks */
   uint16_t size;
   /** @brief Linked list of pointers */
   struct node_s *prev;
   /** @brief Pointer to ned node */
   struct node_s *next;
} node_t;

#include <inttypes.h>
#include "msched.h"

/** @brief Initialize the heap with a single free region of memory.
 * @param region Memory region to initialize
 * @param size Size of the memory region
 */
void mem_init(void *region, uint16_t size);
/** @brief Try to allocate a region of memory.
 * @param size Size of the region to allocate.
 * @return NULL if not enough memory is available, else the allocated memory.
 */
void *mos_mem_alloc(uint16_t size);
/** @brief Free a block of memory.
 * @param block Block of memory to free
 */
void mos_mem_free(void *block);

/** @brief Check the number of bytes used for a given thread's stack
 * 
 * @param t The thread who's stack shall be checked.
 * @return The number of bytes used
 */
uint16_t mos_check_stack(thread_t *t);

#ifdef DEBUG_MEMORY
void print_memory(uint8_t verbose);
#endif