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#ifndef VM_MMAP_H
#define VM_MMAP_H
#include <debug.h>
#include "filesys/off_t.h"
#include "lib/user/syscall.h"
/* we use the same structure as fd_table thus the capacity is fixed to
1024 (PGSIZE/4) */
struct mmap_table
{
struct mmap_table_entry **ids;
int id_free; /* lowest-index free */
int id_max; /* highest-index used */
int id_cap; /* mmap table capacity */
};
/* a single entry in the mmap table */
struct mmap_table_entry
{
void *upage; /* virtual address of first page of mmapped file */
struct file *file; /* file handle */
int pages; /* number of pages the mapping needs */
};
bool mmap_table_init (struct mmap_table *table);
void mmap_table_free (struct mmap_table *table);
mapid_t mmap_table_insert (struct mmap_table *table, void *upage,
struct file *file, off_t len);
bool mmap_table_remove (struct mmap_table *table, mapid_t mapping);
#endif
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