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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 {
private:
// these functions must not be used directly by anyone
virtual segment_map* i_map(page_directory* pagedir, size_t offset) = 0;
virtual void i_unmap(segment_map*) = 0;
public:
int mappings;
segment();
virtual ~segment();
virtual int handle_fault(segment_map* map, size_t addr, int write) = 0; //0 if ok, 1 if segfault
//parameter offset in seg_map doesn't need to be used
segment_map *map(page_directory* pagedir, size_t offset);
// When unmapping a segment, the segment is deleted if it is not mapped anywhere anymore.
void unmap(segment_map* map);
};
struct segment_map {
segment* seg;
page_directory* pagedir;
size_t start, len;
segment_map *next;
};
/// ************************************* SIMPLESEG stuff *****************
struct simpleseg : segment {
int writable;
size_t start, len;
simpleseg(size_t start, size_t len, int writable);
virtual ~simpleseg();
virtual int handle_fault(segment_map* map, size_t addr, int write); //0 if ok, 1 if segfault
int resize(segment_map *map, size_t len);
private:
virtual segment_map* i_map(page_directory* pagedir, size_t offset);
virtual void i_unmap(segment_map*);
};
#endif
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