79 lines
1.5 KiB
C++
79 lines
1.5 KiB
C++
|
/*
|
||
|
|
* Copyright (c) 1993-1995 Argonaut Technologies Limited. All rights reserved.
|
||
|
|
*
|
||
|
|
* $Id: scratch.c 1.7 1995/08/31 16:29:46 sam Exp $
|
||
|
|
* $Locker: $
|
||
|
|
*
|
||
|
|
* Manage a temporary scratchpad for the rest of the system
|
||
|
|
*
|
||
|
|
* Will only allow 1 buffer to be allocated at any time
|
||
|
|
*/
|
||
|
|
#include "fw.h"
|
||
|
|
#include "brassert.h"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Allocate a scratch buffer of the given size
|
||
|
|
*/
|
||
|
|
void *BR_PUBLIC_ENTRY BrScratchAllocate(br_size_t size)
|
||
|
|
{
|
||
|
|
if(fw.scratch_inuse)
|
||
|
|
BR_ERROR0("Scratchpad not available");
|
||
|
|
|
||
|
|
fw.scratch_last = size;
|
||
|
|
|
||
|
|
if(size > fw.scratch_size) {
|
||
|
|
if(fw.scratch_ptr)
|
||
|
|
BrResFree(fw.scratch_ptr);
|
||
|
|
|
||
|
|
fw.scratch_ptr = BrResAllocate(fw.res,size,BR_MEMORY_SCRATCH);
|
||
|
|
#if 0
|
||
|
|
fw.scratch_size = BrResSize(fw.scratch_ptr);
|
||
|
|
#else
|
||
|
|
fw.scratch_size = size;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
fw.scratch_inuse = 1;
|
||
|
|
|
||
|
|
return fw.scratch_ptr;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Release a scratch buffer
|
||
|
|
*/
|
||
|
|
void BR_PUBLIC_ENTRY BrScratchFree(void *scratch)
|
||
|
|
{
|
||
|
|
UASSERT(fw.scratch_ptr == scratch);
|
||
|
|
|
||
|
|
fw.scratch_inuse = 0;
|
||
|
|
|
||
|
|
#if 0 /* Churn memory allocator */
|
||
|
|
BrResFree(fw.scratch_ptr);
|
||
|
|
fw.scratch_ptr = NULL;
|
||
|
|
fw.scratch_size = 0;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Free any allocated scratch buffer
|
||
|
|
*/
|
||
|
|
void BR_PUBLIC_ENTRY BrScratchFlush(void)
|
||
|
|
{
|
||
|
|
if(fw.scratch_inuse)
|
||
|
|
BR_ERROR0("Scratchpad cannot be flushed while in use");
|
||
|
|
|
||
|
|
if(fw.scratch_ptr)
|
||
|
|
BrResFree(fw.scratch_ptr);
|
||
|
|
|
||
|
|
fw.scratch_ptr = NULL;
|
||
|
|
fw.scratch_size = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Find out how much scratch space is 'easily' available
|
||
|
|
*/
|
||
|
|
br_size_t BR_PUBLIC_ENTRY BrScratchInquire(void)
|
||
|
|
{
|
||
|
|
return fw.scratch_size;
|
||
|
|
}
|