diff options
Diffstat (limited to 'contrib/syslinux/syslinux-4.03/core/mem/free.c')
| -rw-r--r-- | contrib/syslinux/syslinux-4.03/core/mem/free.c | 154 |
1 files changed, 0 insertions, 154 deletions
diff --git a/contrib/syslinux/syslinux-4.03/core/mem/free.c b/contrib/syslinux/syslinux-4.03/core/mem/free.c deleted file mode 100644 index 384f10e..0000000 --- a/contrib/syslinux/syslinux-4.03/core/mem/free.c +++ /dev/null @@ -1,154 +0,0 @@ -/* - * free.c - * - * Very simple linked-list based malloc()/free(). - */ - -#include <stdlib.h> -#include <dprintf.h> -#include "malloc.h" - -static struct free_arena_header * -__free_block(struct free_arena_header *ah) -{ - struct free_arena_header *pah, *nah; - struct free_arena_header *head = - &__malloc_head[ARENA_HEAP_GET(ah->a.attrs)]; - - pah = ah->a.prev; - nah = ah->a.next; - if ( ARENA_TYPE_GET(pah->a.attrs) == ARENA_TYPE_FREE && - (char *)pah+ARENA_SIZE_GET(pah->a.attrs) == (char *)ah ) { - /* Coalesce into the previous block */ - ARENA_SIZE_SET(pah->a.attrs, ARENA_SIZE_GET(pah->a.attrs) + - ARENA_SIZE_GET(ah->a.attrs)); - pah->a.next = nah; - nah->a.prev = pah; - -#ifdef DEBUG_MALLOC - ARENA_TYPE_SET(ah->a.attrs, ARENA_TYPE_DEAD); -#endif - - ah = pah; - pah = ah->a.prev; - } else { - /* Need to add this block to the free chain */ - ARENA_TYPE_SET(ah->a.attrs, ARENA_TYPE_FREE); - ah->a.tag = MALLOC_FREE; - - ah->next_free = head->next_free; - ah->prev_free = head; - head->next_free = ah; - ah->next_free->prev_free = ah; - } - - /* In either of the previous cases, we might be able to merge - with the subsequent block... */ - if ( ARENA_TYPE_GET(nah->a.attrs) == ARENA_TYPE_FREE && - (char *)ah+ARENA_SIZE_GET(ah->a.attrs) == (char *)nah ) { - ARENA_SIZE_SET(ah->a.attrs, ARENA_SIZE_GET(ah->a.attrs) + - ARENA_SIZE_GET(nah->a.attrs)); - - /* Remove the old block from the chains */ - nah->next_free->prev_free = nah->prev_free; - nah->prev_free->next_free = nah->next_free; - ah->a.next = nah->a.next; - nah->a.next->a.prev = ah; - -#ifdef DEBUG_MALLOC - ARENA_TYPE_SET(nah->a.attrs, ARENA_TYPE_DEAD); -#endif - } - - /* Return the block that contains the called block */ - return ah; -} - -void free(void *ptr) -{ - struct free_arena_header *ah; - - dprintf("free(%p) @ %p\n", ptr, __builtin_return_address(0)); - - if ( !ptr ) - return; - - ah = (struct free_arena_header *) - ((struct arena_header *)ptr - 1); - -#ifdef DEBUG_MALLOC - assert( ARENA_TYPE_GET(ah->a.attrs) == ARENA_TYPE_USED ); -#endif - - __free_block(ah); - - /* Here we could insert code to return memory to the system. */ -} - -/* - * This is used to insert a block which is not previously on the - * free list. Only the a.size field of the arena header is assumed - * to be valid. - */ -void __inject_free_block(struct free_arena_header *ah) -{ - struct free_arena_header *head = - &__malloc_head[ARENA_HEAP_GET(ah->a.attrs)]; - struct free_arena_header *nah; - size_t a_end = (size_t) ah + ARENA_SIZE_GET(ah->a.attrs); - size_t n_end; - - dprintf("inject: %#zx bytes @ %p, heap %u (%p)\n", - ARENA_SIZE_GET(ah->a.attrs), ah, - ARENA_HEAP_GET(ah->a.attrs), head); - - for (nah = head->a.next ; nah != head ; nah = nah->a.next) { - n_end = (size_t) nah + ARENA_SIZE_GET(nah->a.attrs); - - /* Is nah entirely beyond this block? */ - if ((size_t) nah >= a_end) - break; - - /* Is this block entirely beyond nah? */ - if ((size_t) ah >= n_end) - continue; - - /* Otherwise we have some sort of overlap - reject this block */ - return; - } - - /* Now, nah should point to the successor block */ - ah->a.next = nah; - ah->a.prev = nah->a.prev; - nah->a.prev = ah; - ah->a.prev->a.next = ah; - - __free_block(ah); -} - -/* - * Free all memory which is tagged with a specific tag. - */ -static void __free_tagged(malloc_tag_t tag) { - struct free_arena_header *fp, *head; - int i; - - for (i = 0; i < NHEAP; i++) { - dprintf("__free_tagged(%u) heap %d\n", tag, i); - head = &__malloc_head[i]; - for (fp = head->a.next ; fp != head ; fp = fp->a.next) { - if (ARENA_TYPE_GET(fp->a.attrs) == ARENA_TYPE_USED && - fp->a.tag == tag) - fp = __free_block(fp); - } - } - - dprintf("__free_tagged(%u) done\n", tag); -} - -void comboot_cleanup_lowmem(com32sys_t *regs) -{ - (void)regs; - - __free_tagged(MALLOC_MODULE); -} |