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feat: incorporate lazy-loading data & helpers into supplemental page table

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Themis Demetriades
2024-12-04 16:45:31 +00:00
parent fb73d694bf
commit 4bf6914cfa
5 changed files with 152 additions and 10 deletions
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29
src/vm/page.h
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@@ -2,7 +2,36 @@
#define VM_PAGE_H
#include "threads/thread.h"
#include "filesys/off_t.h"
enum page_type {
PAGE_EXECUTABLE,
PAGE_EMPTY
};
struct page_entry {
enum page_type type; /* Type of Data that should go into the page */
void *upage; /* Start Address of the User Page (Key of hash table). */
/* File Data */
struct file *file; /* Pointer to the file for executables. */
off_t offset; /* Offset of the page content within the file. */
uint32_t read_bytes; /* Number of bytes to read within the page. */
uint32_t zero_bytes; /* Number of bytes to zero within the page. */
bool writable; /* Flag for whether this page is writable or not. */
struct hash_elem elem; /* An elem for the hash table. */
};
unsigned page_hash (const struct hash_elem *e, void *aux);
bool page_less (const struct hash_elem *a_, const struct hash_elem *b_,
void *aux);
struct page_entry *page_insert (struct file *file, off_t ofs, void *upage,
uint32_t read_bytes, uint32_t zero_bytes,
bool writable, enum page_type type);
struct page_entry *page_get (void *upage);
bool page_load (struct page_entry *page, bool writable);
void page_cleanup (struct hash_elem *e, void *aux);
void page_set_swap (struct thread *, void *, size_t);
bool page_in_swap (struct thread *, void *);
size_t page_get_swap (struct thread *, void *);