void * PMAPI PM_allocLockedMem(
uint size,
ulong *physAddr,
ibool contiguous,
ibool below16M)
{
void* linear;
/* Allocate a physically contiguous buffer */
#ifdef __QNXNTO__
if ((linear = mmap(NULL,size,PROT_READ|PROT_WRITE,MAP_PHYS|MAP_ANON,NOFD,0)) == MAP_FAILED) {
#else
if ((linear = mmap(NULL,size,PROT_READ|PROT_WRITE,MAP_ANON,NOFD,0)) == -1) {
#endif
perror("PM_allocLockedMem mmap");
return NULL;
}
*physAddr = PM_getPhysicalAddr(linear);
return linear;
}
void PMAPI PM_freeLockedMem(
void *p,
uint size,
ibool contiguous)
{
if (munmap(p,size) == -1)
perror("PM_freeLockedMem munmap");
}
/****************************************************************************
REMARKS:
Allocates a new block of pages for the page block manager.
****************************************************************************/
static pageblock *PM_addNewPageBlock(void)
{
int i,size;
pageblock *newBlock;
char *p,*next;
/* Allocate memory for the new page block, and add to head of list */
size = PAGES_PER_BLOCK * PM_PAGE_SIZE + (PM_PAGE_SIZE-1) + sizeof(pageblock);
if ((newBlock = PM_malloc(size)) == NULL)
return NULL;
newBlock->prev = NULL;
newBlock->next = pageBlocks;
if (pageBlocks)
pageBlocks->prev = newBlock;
pageBlocks = newBlock;
/* Initialise the page aligned free list for the page block */
newBlock->freeCount = PAGES_PER_BLOCK;
newBlock->freeList = p = (char*)(((ulong)(newBlock + 1) + (PM_PAGE_SIZE-1)) & ~(PM_PAGE_SIZE-1));
newBlock->freeListStart = newBlock->freeList;
newBlock->freeListEnd = p + (PAGES_PER_BLOCK-1) * PM_PAGE_SIZE;
for (i = 0; i < PAGES_PER_BLOCK; i++,p = next)
FREELIST_NEXT(p) = next = p + PM_PAGE_SIZE;
FREELIST_NEXT(p - PM_PAGE_SIZE) = NULL;
return newBlock;
}
/****************************************************************************
REMARKS:
Free a page aligned and page sized block of memory
****************************************************************************/
void PMAPI PM_freePage(
void *p)
{
pageblock *block;
/* First find the page block that this page belongs to */
for (block = pageBlocks; block != NULL; block = block->next) {
if (p >= block->freeListStart && p <= block->freeListEnd)
break;
}
CHECK(block != NULL);
/* Now free the block by adding it to the free list */
FREELIST_NEXT(p) = block->freeList;
block->freeList = p;
if (++block->freeCount == PAGES_PER_BLOCK) {
/* If all pages in the page block are now free, free the entire
* page block itself.
*/
if (block == pageBlocks) {
/* Delete from head */
pageBlocks = block->next;
if (block->next)
block->next->prev = NULL;
}
else {
/* Delete from middle of list */
CHECK(block->prev != NULL);
block->prev->next = block->next;
if (block->next)
block->next->prev = block->prev;
}
PM_free(block);
}
}
/****************************************************************************
RETURNS:
Pointer to new segment
REMARKS:
Allocates space for a new segment in the segment pool from the free list.
If there are no more segments, we attempt to re-size the segment pool
which will bomb out if we run out of memory.
{secret}
****************************************************************************/
segment_t *_MGL_newSegment(void)
{
segment_t *p;
if (_MGL_segList.freeList == NULL)
resizeSegmentList();
p = _MGL_segList.freeList;
_MGL_segList.freeList = FREELIST_NEXT(p);
return p;
}
static struct segment *
new_segment()
{
struct segment *seg;
FREELIST_NEXT(heap_space.freelist, seg);
if (seg == NULL)
return NULL;
seg->next = NULL;
return seg;
}
/****************************************************************************
REMARKS:
Allocates a page aligned and page sized block of memory
****************************************************************************/
void * PMAPI PM_allocPage(
ibool locked)
{
pageblock *block;
void *p;
PM_lockHandle lh;
/* Scan the block list looking for any free blocks. Allocate a new
* page block if no free blocks are found. */
for (block = pageBlocks; block != NULL; block = block->next) {
if (block->freeCount)
break;
}
if (block == NULL && (block = PM_addNewPageBlock()) == NULL)
return NULL;
block->freeCount--;
p = block->freeList;
block->freeList = FREELIST_NEXT(p);
if (locked)
PM_lockDataPages(p,PM_PAGE_SIZE,&lh);
return p;
}
