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Line 45... Line 45...
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static index_t hash(__native key[]);
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static index_t hash(__native key[]);
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static bool compare(__native key[], count_t keys, link_t *item);
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static bool compare(__native key[], count_t keys, link_t *item);
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static void remove_callback(link_t *item);
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static void remove_callback(link_t *item);
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static void ht_mapping_insert(as_t *as, __address page, __address frame, int flags);
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static void ht_mapping_insert(as_t *as, __address page, __address frame, int flags);
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static void ht_mapping_remove(as_t *as, __address page);
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static pte_t *ht_mapping_find(as_t *as, __address page);
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static pte_t *ht_mapping_find(as_t *as, __address page);
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/**
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/**
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 * This lock protects the page hash table.
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 * This lock protects the page hash table.
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 */
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 */
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};
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};
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/** Page mapping operations for page hash table architectures. */
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/** Page mapping operations for page hash table architectures. */
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page_mapping_operations_t ht_mapping_operations = {
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page_mapping_operations_t ht_mapping_operations = {
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    .mapping_insert = ht_mapping_insert,
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    .mapping_insert = ht_mapping_insert,
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    .mapping_remove = ht_mapping_remove,
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    .mapping_find = ht_mapping_find
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    .mapping_find = ht_mapping_find
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};
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};
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/** Compute page hash table index.
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/** Compute page hash table index.
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 *
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 *
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 * @param flags Flags to be used for mapping.
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 * @param flags Flags to be used for mapping.
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 */
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 */
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void ht_mapping_insert(as_t *as, __address page, __address frame, int flags)
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void ht_mapping_insert(as_t *as, __address page, __address frame, int flags)
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{
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{
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    pte_t *t;
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    pte_t *t;
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    ipl_t ipl;
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    __native key[2] = { (__address) as, page };
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    __native key[2] = { (__address) as, page };
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    ipl = interrupts_disable();
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    spinlock_lock(&page_ht_lock);
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    spinlock_lock(&page_ht_lock);
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    if (!hash_table_find(&page_ht, key)) {
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    if (!hash_table_find(&page_ht, key)) {
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        t = (pte_t *) malloc(sizeof(pte_t), FRAME_ATOMIC);
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        t = (pte_t *) malloc(sizeof(pte_t), FRAME_ATOMIC);
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        ASSERT(t != NULL);
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        ASSERT(t != NULL);
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        hash_table_insert(&page_ht, key, &t->link);
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        hash_table_insert(&page_ht, key, &t->link);
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    }
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    }
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    spinlock_unlock(&page_ht_lock);
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    spinlock_unlock(&page_ht_lock);
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    interrupts_restore(ipl);
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}
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}
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/** Remove mapping of page from page hash table.
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 *
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 * Remove any mapping of 'page' within address space 'as'.
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 * TLB shootdown should follow in order to make effects of
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 * this call visible.
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 *
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 * The address space must be locked and interrupts must be disabled.
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 *
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 * @param as Address space to wich page belongs.
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 * @param page Virtual address of the page to be demapped.
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 */
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void ht_mapping_remove(as_t *as, __address page)
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{
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    __native key[2] = { (__address) as, page };
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    spinlock_lock(&page_ht_lock);
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    /*
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     * Note that removed PTE's will be freed
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     * by remove_callback().
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     */
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    hash_table_remove(&page_ht, key, 2);
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    spinlock_unlock(&page_ht_lock);
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}
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/** Find mapping for virtual page in page hash table.
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/** Find mapping for virtual page in page hash table.
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 *
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 *
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 * Find mapping for virtual page.
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 * Find mapping for virtual page.
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 *
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 *
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 * The address space must be locked and interrupts must be disabled.
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 * The address space must be locked and interrupts must be disabled.