• pj2 까지 버전

/* Loads a segment starting at offset OFS in FILE at address
 * UPAGE.  In total, READ_BYTES + ZERO_BYTES bytes of virtual
 * memory are initialized, as follows:
 *
 * - READ_BYTES bytes at UPAGE must be read from FILE
 * starting at offset OFS.
 *
 * - ZERO_BYTES bytes at UPAGE + READ_BYTES must be zeroed.
 *
 * The pages initialized by this function must be writable by the
 * user process if WRITABLE is true, read-only otherwise.
 *
 * Return true if successful, false if a memory allocation error
 * or disk read error occurs. */
static bool
load_segment(struct file *file, off_t ofs, uint8_t *upage,
			 uint32_t read_bytes, uint32_t zero_bytes, bool writable)
{
	ASSERT((read_bytes + zero_bytes) % PGSIZE == 0);
	ASSERT(pg_ofs(upage) == 0);
	ASSERT(ofs % PGSIZE == 0);

	while (read_bytes > 0 || zero_bytes > 0)
	{
		/* Do calculate how to fill this page.
		 * We will read PAGE_READ_BYTES bytes from FILE
		 * and zero the final PAGE_ZERO_BYTES bytes. */
		size_t page_read_bytes = read_bytes < PGSIZE ? read_bytes : PGSIZE;
		size_t page_zero_bytes = PGSIZE - page_read_bytes;

		/* TODO: Set up aux to pass information to the lazy_load_segment. */
		void *aux = NULL;
		if (!vm_alloc_page_with_initializer(VM_ANON, upage,
											writable, lazy_load_segment, aux))
			return false;

		/* Advance. */
		read_bytes -= page_read_bytes;
		zero_bytes -= page_zero_bytes;
		upage += PGSIZE;
	}
	return true;
}

달라진 부분

		/* Get a page of memory. */
		uint8_t *kpage = palloc_get_page(PAL_USER);
		if (kpage == NULL)
			return false;

		/* Load this page. */
		if (file_read(file, kpage, page_read_bytes) != (int)page_read_bytes)
		{
			palloc_free_page(kpage);
			return false;
		}
		memset(kpage + page_read_bytes, 0, page_zero_bytes);

		/* Add the page to the process's address space. */
		if (!install_page(upage, kpage, writable))
		{
			printf("fail\\n");
			palloc_free_page(kpage);
			return false;
		}

	/* TODO: Set up aux to pass information to the lazy_load_segment. */
		void *aux = NULL;
		if (!vm_alloc_page_with_initializer(VM_ANON, upage,
											writable, lazy_load_segment, aux))
			return false;