malloc.c
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/**************************************************************************
* *
* Copyright (C) 1994, Silicon Graphics, Inc. *
* *
* These coded instructions, statements, and computer programs contain *
* unpublished proprietary information of Silicon Graphics, Inc., and *
* are protected by Federal copyright law. They may not be disclosed *
* to third parties or copied or duplicated in any form, in whole or *
* in part, without the prior written consent of Silicon Graphics, Inc. *
* *
**************************************************************************/
/**************************************************************************
*
* Module: malloc.c
*
* $Revision: 1.1.1.2 $
* $Date: 2002/10/29 08:06:43 $
* $Author: blythe $
* $Source: /root/leakn64/depot/rf/sw/n64os20l/libultra/monegi/rg/malloc.c,v $
*
**************************************************************************/
#include "os.h"
#include "os_internal.h"
#include "region.h"
#include "ultraerror.h"
#include "assert.h"
/*
* Name: osMalloc
*
* Description:
* This routine allocates a buffer of fixed size from the region
* pointed by 'region'.
*
* Upon success, the routine returns a pointer to a buffer of
* of size 'bufferSize' as defined in osCreateRegion().
* Otherwise, it will return NULL if there is not enough available
* free buffers in the region.
*
* Globals Referenced:
* None
*/
void *
osMalloc(void *region)
{
register OSRegion *rp = region;
char *addr;
#ifdef _DEBUG
/* Validate region id: not null and aligned to equal starting address */
assert(rp != NULL);
if (((char *)rp + ALIGN(sizeof(OSRegion), RP(alignSize))) !=
RP(startBufferAddress)) {
__osError(ERR_OSMALLOC, 1, region);
return((void *)NULL);
}
#endif
/* If there is no more free buffer, simply return NULL */
if (RP(freeList) == BUF_FREE_WO_NEXT)
return(NULL);
/* Adjust the free list pointer */
addr = RP(startBufferAddress) + (RP(freeList)*RP(bufferSize));
RP(freeList) = *(unsigned short *)addr;
return((void *)addr);
} /* end of osMalloc */