99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
/*
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* malloc.h
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*
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* Internals for the memory allocator
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*/
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#include <stdint.h>
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#include <stddef.h>
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#include "core.h"
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#include "thread.h"
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extern struct semaphore __malloc_semaphore;
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/*
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* This is a temporary hack. In Syslinux 5 this will be a pointer to
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* the owner module.
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*/
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typedef size_t malloc_tag_t;
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enum malloc_owner {
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MALLOC_FREE,
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MALLOC_HEAD,
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MALLOC_CORE,
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MALLOC_MODULE,
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};
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enum arena_type {
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ARENA_TYPE_USED = 0,
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ARENA_TYPE_FREE = 1,
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ARENA_TYPE_HEAD = 2,
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ARENA_TYPE_DEAD = 3,
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};
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enum heap {
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HEAP_MAIN,
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HEAP_LOWMEM,
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NHEAP
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};
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#define ARENA_MAGIC 0x20130117
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struct free_arena_header;
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/*
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* This structure should be a power of two. This becomes the
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* alignment unit.
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*/
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struct arena_header {
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malloc_tag_t tag;
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size_t attrs; /* Bits 0..1: Type
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2..3: Heap,
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4..31: MSB of the size */
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struct free_arena_header *next, *prev;
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#ifdef DEBUG_MALLOC
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unsigned long _pad[3];
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unsigned int magic;
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#endif
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};
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/* Pad to 2*sizeof(struct arena_header) */
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#define ARENA_PADDING ((2 * sizeof(struct arena_header)) - \
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(sizeof(struct arena_header) + \
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sizeof(struct free_arena_header *) + \
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sizeof(struct free_arena_header *)))
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/*
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* This structure should be no more than twice the size of the
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* previous structure.
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*/
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struct free_arena_header {
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struct arena_header a;
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struct free_arena_header *next_free, *prev_free;
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size_t _pad[ARENA_PADDING];
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};
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#define ARENA_SIZE_MASK (~(uintptr_t)(sizeof(struct arena_header)-1))
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#define ARENA_HEAP_MASK ((size_t)0xc)
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#define ARENA_HEAP_POS 2
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#define ARENA_TYPE_MASK ((size_t)0x3)
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#define ARENA_ALIGN_UP(p) ((char *)(((uintptr_t)(p) + ~ARENA_SIZE_MASK) \
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& ARENA_SIZE_MASK))
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#define ARENA_ALIGN_DOWN(p) ((char *)((uintptr_t)(p) & ARENA_SIZE_MASK))
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#define ARENA_SIZE_GET(attrs) ((attrs) & ARENA_SIZE_MASK)
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#define ARENA_HEAP_GET(attrs) (((attrs) & ARENA_HEAP_MASK) >> ARENA_HEAP_POS)
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#define ARENA_TYPE_GET(attrs) ((attrs) & ARENA_TYPE_MASK)
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#define ARENA_SIZE_SET(attrs, size) \
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((attrs) = ((size) & ARENA_SIZE_MASK) | ((attrs) & ~ARENA_SIZE_MASK))
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#define ARENA_HEAP_SET(attrs, heap) \
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((attrs) = (((heap) << ARENA_HEAP_POS) & ARENA_HEAP_MASK) | \
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((attrs) & ~ARENA_HEAP_MASK))
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#define ARENA_TYPE_SET(attrs, type) \
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((attrs) = ((attrs) & ~ARENA_TYPE_MASK) | \
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((type) & ARENA_TYPE_MASK))
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extern struct free_arena_header __core_malloc_head[NHEAP];
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void __inject_free_block(struct free_arena_header *ah);
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