0,0 → 1,115 |
/* |
* 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. |
*/ |
|
/** |
* @file as_ht.c |
* @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); |
} |