free.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* unpublished proprietary information of Silicon Graphics, Inc., and *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: free.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/free.c,v $
*
**************************************************************************/
#include "os.h"
#include "os_internal.h"
#include "region.h"
#include "ultraerror.h"
#include "assert.h"
/*
* Name: osFree
*
* Description:
* This routine frees a buffer pointed by 'addr' to the region
* pointed by 'region'.
*
* Globals Referenced:
* None
*/
void
osFree(void *region, void *addr)
{
register OSRegion *rp = region;
int i;
#ifdef _DEBUG
/* Make sure that region and buffer address are not null */
assert((region != NULL) && (addr != NULL));
if (((char *)rp + ALIGN(sizeof(OSRegion), RP(alignSize))) !=
RP(startBufferAddress)) {
__osError(ERR_OSFREE_REGION, 1, region);
return;
}
#endif
/* Calculate the buffer index number */
i = ((unsigned char *)addr - RP(startBufferAddress)) / RP(bufferSize);
#ifdef _DEBUG
/* Check for valid array index range */
if ((i < 0) || (i >= RP(bufferCount))) {
__osError(ERR_OSFREE_ADDR, 2, addr, region);
return;
}
/*
* Double-check for valid input 'addr': must aligned with buffer size
*/
if (((unsigned char *)addr - RP(startBufferAddress)) % (RP(bufferSize)) != 0) {
__osError(ERR_OSFREE_ADDR, 2, addr, region);
return;
}
#endif
/*
* Mark the released buffer as FREE by inserting it to the front of
* the free list
*/
*(unsigned short *)(RP(startBufferAddress) + (i*RP(bufferSize))) =
RP(freeList);
/* Adjust the free list to point to the new released buffer */
RP(freeList) = i;
} /* end of osFree */