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#ifndef DEF_SEG_H
#define DEF_SEG_H
/* Segments are pieces of usable memory in a process' address space.
They have nothing to do with GDT segments, they are created over paging. */
#include "paging.h"
struct segment_map;
struct segment {
void* seg_data;
int mappings;
// these 4 functions must not be used directly by anyone
struct segment_map* (*map)(struct segment* seg, struct page_directory* pagedir, size_t offset);
void (*unmap)(struct segment_map*);
void (*delete)(struct segment* seg);
int (*handle_fault)(struct segment_map* map, size_t addr, int write); //0 if ok, 1 if segfault
};
struct segment_map {
struct segment* seg;
struct page_directory* pagedir;
size_t start, len;
struct segment_map *next;
};
//parameter offset in seg_map doesn't need to be used
struct segment_map *seg_map(struct segment* seg, struct page_directory* pagedir, size_t offset);
/* When unmapping a segment, the segment is deleted if it is not mapped anywhere anymore. */
void seg_unmap(struct segment_map* map);
/// ************************************* SIMPLESEG stuff *****************
struct simpleseg {
int writable;
size_t start, len;
};
struct segment* simpleseg_make(size_t start, size_t len, int writable);
int simpleseg_resize(struct segment_map *map, size_t len);
#endif
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