8eb3bf3559
maintain page structures dynamically covering only file mappings. use hash table for address <-> page structure conversion.
72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
/**
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* \file page.h
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* License details are found in the file LICENSE.
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* \brief
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* Structures and functions of memory page
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* \author Taku Shimosawa <shimosawa@is.s.u-tokyo.ac.jp> \par
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* Copyright (C) 2011 - 2012 Taku Shimosawa
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*/
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/*
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* HISTORY
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*/
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#ifndef __HEADER_PAGE_H
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#define __HEADER_PAGE_H
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#include <ihk/atomic.h>
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struct page {
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struct list_head list;
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struct list_head hash;
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uint8_t mode;
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uint64_t phys;
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ihk_atomic_t count;
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off_t offset;
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};
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/* mode */
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enum page_mode {
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PM_NONE = 0x00,
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PM_PENDING_FREE = 0x01,
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PM_WILL_PAGEIO = 0x02,
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PM_PAGEIO = 0x03,
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PM_DONE_PAGEIO = 0x04,
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PM_PAGEIO_EOF = 0x05,
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PM_PAGEIO_ERROR = 0x06,
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PM_MAPPED = 0x07,
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};
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struct page *phys_to_page(uintptr_t phys);
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uintptr_t page_to_phys(struct page *page);
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int page_unmap(struct page *page);
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struct page *phys_to_page_insert_hash(uint64_t phys);
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void begin_free_pages_pending(void);
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void finish_free_pages_pending(void);
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static inline void page_map(struct page *page)
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{
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ihk_atomic_inc(&page->count);
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}
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static inline int page_is_in_memobj(struct page *page)
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{
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return (0
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|| (page->mode == PM_MAPPED)
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|| (page->mode == PM_PAGEIO)
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|| (page->mode == PM_WILL_PAGEIO)
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|| (page->mode == PM_DONE_PAGEIO)
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|| (page->mode == PM_PAGEIO_EOF)
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|| (page->mode == PM_PAGEIO_ERROR)
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);
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}
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static inline int page_is_multi_mapped(struct page *page)
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{
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return (ihk_atomic_read(&page->count) > 1);
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}
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/* Should we take page faults on ANONYMOUS mappings? */
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extern int anon_on_demand;
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#endif
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