/*
* Copyright (C) 2001-2004 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.
*/
#ifndef __AS_H__
#define __AS_H__
#include <arch/mm/page.h>
#include <arch/mm/as.h>
#include <arch/mm/asid.h>
#include <arch/types.h>
#include <typedefs.h>
#include <synch/spinlock.h>
#include <list.h>
#define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH
#define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH
#define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH
#define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH
#define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END)
#define UTEXT_ADDRESS UTEXT_ADDRESS_ARCH
#define USTACK_ADDRESS USTACK_ADDRESS_ARCH
#define UDATA_ADDRESS UDATA_ADDRESS_ARCH
#define AS_KERNEL (1<<0) /**< Kernel address space. */
enum as_area_type {
AS_AREA_TEXT = 1, AS_AREA_DATA, AS_AREA_STACK
};
/** Address space area structure.
*
* Each as_area_t structure describes one contiguous area of virtual memory.
* In the future, it should not be difficult to support shared areas.
*/
struct as_area {
SPINLOCK_DECLARE(lock);
link_t link;
as_area_type_t type;
size_t size; /**< Size of this area in multiples of PAGE_SIZE. */
__address base; /**< Base address of this area. */
index_t *mapping; /**< Map of physical frame numbers mapped to virtual page numbers in this area. */
};
/** Address space structure.
*
* as_t contains the list of as_areas of userspace accessible
* pages for one or more tasks. Ranges of kernel memory pages are not
* supposed to figure in the list as they are shared by all tasks and
* set up during system initialization.
*/
struct as {
/** Protected by asidlock. Must be acquired before as-> lock. */
link_t as_with_asid_link;
SPINLOCK_DECLARE(lock);
link_t as_area_head;
pte_t *ptl0;
asid_t asid; /**< Address space identifier. */
};
extern as_t * as_create(pte_t *ptl0, int flags);
extern as_area_t *as_area_create(as_t *as, as_area_type_t type, size_t size, __address base);
extern void as_area_set_mapping(as_area_t *a, index_t vpn, index_t pfn);
extern int as_page_fault(__address page);
extern void as_install(as_t *m);
/* Interface to be implemented by architectures. */
#ifndef as_install_arch
extern void as_install_arch(as_t *as);
#endif /* !def as_install_arch */
#endif