91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
#pragma once
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// boolean types
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#include <stdbool.h>
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// size_t, already in libft.h but for readability
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#include <stddef.h>
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// Remove this and replace it with <assert.h> header
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// for debugging purposes
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// BPZ = Blocks Per Zone, which is the max
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// number of blocks for a new zone
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enum { BPZ = 128, PAGES_TINY = 16, PAGES_SMALL = 64, MEM_ALIGN = 8 };
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typedef enum { TINY, SMALL, LARGE } block_type_t;
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/* METADATA:
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* ptr: the ptr to return with kmalloc (aligned)
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* size: the actual size
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* sub_size: the size asked by the user (different
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* from size only if krealloc and krealloc size < size)
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* in_use: bool to track block state
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* zone: the zone containing the block
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*
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* LINKED LIST:
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* next and prev will never change, it's the original block's
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* position (initialized when creating the blocks)
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* next/prev_used: linked list for the
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* in_use blocks (Block *used in struct Zone)
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* next/prev_free: linked list for the
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* available blocks (Block *free in struct Zone)
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*/
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typedef struct Block {
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void *ptr;
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size_t size;
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size_t sub_size;
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bool in_use;
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struct Zone *zone;
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struct Block *prev;
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struct Block *next;
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struct Block *prev_used;
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struct Block *next_used;
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struct Block *prev_free;
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struct Block *next_free;
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} Block;
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/* free is the first list, when creating the blocks
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* used is a list at the end of the free list, which contains all the blocks
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* in_use
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*/
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typedef struct Zone {
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Block *free;
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Block *used;
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size_t size;
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struct Zone *prev;
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struct Zone *next;
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block_type_t type;
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} Zone;
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/* Linked list to store all the zones (pages) mapped.
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* The attribute type is either TINY, SMALL or LARGE.
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* For TINY and SMALL, the zone will be divided in blocks.
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* For LARGE, it will be entire page(s).
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*/
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extern Zone *kzones[3];
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extern Zone *zones[3];
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/*----------- UTILS ----------*/
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block_type_t get_type(size_t size);
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size_t get_zone_size(block_type_t type);
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size_t align_mem(size_t addr);
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/*----------------------------*/
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/*-------- ALLOCATOR ---------*/
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int new_kzone(block_type_t type, size_t size);
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int new_vzone(block_type_t type, size_t size);
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/*----------------------------*/
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void *kmalloc(size_t size);
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void kfree(void *ptr);
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void *krealloc(void *ptr, size_t size);
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void *vmalloc(size_t size);
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void vfree(void *ptr);
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void *vrealloc(void *ptr, size_t size);
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void show_kalloc_mem(void);
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void show_valloc_mem(void);
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size_t ksize(void *virt_addr);
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size_t vsize(void *virt_addr);
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