| 0,0 → 1,123 |
|---|
| /* |
| * Copyright (C) 2006 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** @addtogroup genarchmm |
| * @{ |
| */ |
| |
| /** |
| * @file |
| * @brief Address space functions for global page hash table. |
| */ |
| |
| #include <genarch/mm/as_ht.h> |
| #include <genarch/mm/page_ht.h> |
| #include <mm/as.h> |
| #include <mm/frame.h> |
| #include <arch/types.h> |
| #include <typedefs.h> |
| #include <memstr.h> |
| #include <adt/hash_table.h> |
| #include <synch/mutex.h> |
| |
| static pte_t *ht_create(int flags); |
| static void ht_destroy(pte_t *page_table); |
| |
| static void ht_lock(as_t *as, bool lock); |
| static void ht_unlock(as_t *as, bool unlock); |
| |
| as_operations_t as_ht_operations = { |
| .page_table_create = ht_create, |
| .page_table_destroy = ht_destroy, |
| .page_table_lock = ht_lock, |
| .page_table_unlock = ht_unlock, |
| }; |
| |
| |
| /** Page hash table create. |
| * |
| * The page hash table will be created only once |
| * and will be shared by all address spaces. |
| * |
| * @param flags Ignored. |
| * |
| * @return Returns NULL. |
| */ |
| pte_t *ht_create(int flags) |
| { |
| if (flags & FLAG_AS_KERNEL) { |
| hash_table_create(&page_ht, PAGE_HT_ENTRIES, 2, &ht_operations); |
| mutex_initialize(&page_ht_lock); |
| } |
| return NULL; |
| } |
| |
| /** Destroy page table. |
| * |
| * Actually do nothing as the global page hash table is used. |
| * |
| * @param page_table This parameter is ignored. |
| */ |
| void ht_destroy(pte_t *page_table) |
| { |
| /* No-op. */ |
| } |
| |
| /** Lock page table. |
| * |
| * Lock address space and page hash table. |
| * Interrupts must be disabled. |
| * |
| * @param as Address space. |
| * @param lock If false, do not attempt to lock the address space. |
| */ |
| void ht_lock(as_t *as, bool lock) |
| { |
| if (lock) |
| mutex_lock(&as->lock); |
| mutex_lock(&page_ht_lock); |
| } |
| |
| /** Unlock page table. |
| * |
| * Unlock address space and page hash table. |
| * Interrupts must be disabled. |
| * |
| * @param as Address space. |
| * @param unlock If false, do not attempt to lock the address space. |
| */ |
| void ht_unlock(as_t *as, bool unlock) |
| { |
| mutex_unlock(&page_ht_lock); |
| if (unlock) |
| mutex_unlock(&as->lock); |
| } |
| |
| /** @} |
| */ |
| |