source: svn/trunk/newcon3bcm2_21bu/dta/src/bootloader/fast_heap.c @ 2

/***************************************************************************
 *     Copyright (c) 2003-2010, Broadcom Corporation
 *     All Rights Reserved
 *     Confidential Property of Broadcom Corporation
 *
 *  THIS SOFTWARE MAY ONLY BE USED SUBJECT TO AN EXECUTED SOFTWARE LICENSE
 *  AGREEMENT  BETWEEN THE USER AND BROADCOM.  YOU HAVE NO RIGHT TO USE OR
 *  EXPLOIT THIS MATERIAL EXCEPT SUBJECT TO THE TERMS OF SUCH AN AGREEMENT.
 *
 * $brcm_Workfile: $
 * $brcm_Revision: $
 * $brcm_Date: $
 *
 * Module Description: Simple and fast heap moduile for use in bootloader.
 * Relies on unlimited memory being availabe since it will not free 
 * anything
 *
 * Revision History:
 *
 * $brcm_Log: $
 * 
 *
 ***************************************************************************/
#include "fast_heap.h"

#define FAST_HEAP_MAGIC 0xBADBABEB
struct heap_state_t {
    unsigned int initialized;
    unsigned long start;
    unsigned long top;
    unsigned long allocated;
    unsigned long freed;  
};

static struct heap_state_t heap;

#if defined(BCM_DEBUG)
void * malloc_dbg(size_t size, char* file, int line)
#else
void * malloc(size_t size)
#endif
{
    unsigned long * block;
    size += 8;
    size = (size >> 2) << 2;    /* align size on 4 bytes */
    block = (unsigned long *)heap.top;
    *block = size;
    block++;
    heap.top += size;
    heap.allocated += size;
    return (void*)block;
}

#if defined(BCM_DEBUG)
void free_dbg(void *ptr, char* file, int line)
#else
void free(void * ptr)
#endif
{
    unsigned long * size;
    size = (unsigned long *)ptr - 1;
    heap.freed += *size;
    return;
}

void fast_heap_init(unsigned long heap_start)
{
    heap.initialized = FAST_HEAP_MAGIC;
    if(heap_start & 0x3){
        heap_start = ((heap_start + 4) >> 2) << 2;
    }
    heap.start = heap_start;
    heap.top = heap.start;
    heap.allocated = 0;
    heap.freed = 0;
}