48 lines
1.8 KiB
C
48 lines
1.8 KiB
C
#ifndef VM_PAGE_H
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#define VM_PAGE_H
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#include "threads/thread.h"
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#include "threads/synch.h"
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#include "filesys/off_t.h"
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enum page_type {
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PAGE_FILE,
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PAGE_MMAP
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};
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struct page_entry {
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enum page_type type; /* Type of Data that should go into the page */
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void *upage; /* Start Address of the User Page (Key of hash table). */
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/* Data for swapped pages */
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struct lock lock; /* Enforces mutual exclusion in accessing the page
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referenced by the entry between its owning process
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and any thread performing page eviction. */
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/* File Data */
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struct file *file; /* Pointer to the file for executables. */
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off_t offset; /* Offset of the page content within the file. */
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uint32_t read_bytes; /* Number of bytes to read within the page. */
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uint32_t zero_bytes; /* Number of bytes to zero within the page. */
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bool writable; /* Flag for whether this page is writable or not. */
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struct hash_elem elem; /* An elem for the hash table. */
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};
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unsigned page_hash (const struct hash_elem *e, void *aux);
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bool page_less (const struct hash_elem *a_, const struct hash_elem *b_,
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void *aux);
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struct page_entry *page_insert_swapped (void *upage, void* kpage,
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struct thread *owner);
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struct page_entry *page_insert_file (struct file *file, off_t ofs, void *upage,
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uint32_t read_bytes, uint32_t zero_bytes,
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bool writable, enum page_type);
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struct page_entry *page_get (struct thread *thread, void *upage);
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bool page_load_file (struct page_entry *page, bool writable);
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void page_cleanup (struct hash_elem *e, void *aux);
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bool page_in_swap (struct thread *, void *);
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size_t page_get_swap (struct thread *owner, void *upage);
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#endif /* vm/frame.h */
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