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1 jermar 1
/*
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 * Copyright (C) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#ifndef __AS_H__
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#define __AS_H__
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#include <arch/mm/page.h>
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#include <arch/mm/as.h>
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#include <arch/mm/asid.h>
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#include <arch/types.h>
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#include <typedefs.h>
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#include <synch/spinlock.h>
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#include <adt/list.h>
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#include <adt/btree.h>
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/** Defined to be true if user address space and kernel address space shadow each other. */
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#define KERNEL_ADDRESS_SPACE_SHADOWED   KERNEL_ADDRESS_SPACE_SHADOWED_ARCH
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#define KERNEL_ADDRESS_SPACE_START  KERNEL_ADDRESS_SPACE_START_ARCH
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#define KERNEL_ADDRESS_SPACE_END    KERNEL_ADDRESS_SPACE_END_ARCH
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#define USER_ADDRESS_SPACE_START    USER_ADDRESS_SPACE_START_ARCH
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#define USER_ADDRESS_SPACE_END      USER_ADDRESS_SPACE_END_ARCH
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#define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END)
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#define USTACK_ADDRESS  USTACK_ADDRESS_ARCH
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#define FLAG_AS_KERNEL      (1 << 0)    /**< Kernel address space. */
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/** Address space area flags. */
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#define AS_AREA_READ    1
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#define AS_AREA_WRITE   2
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#define AS_AREA_EXEC    4
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#define AS_AREA_DEVICE  8
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/** Address space area structure.
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 *
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 * Each as_area_t structure describes one contiguous area of virtual memory.
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 * In the future, it should not be difficult to support shared areas.
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 */
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struct as_area {
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    SPINLOCK_DECLARE(lock);
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    int flags;
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    count_t pages;      /**< Size of this area in multiples of PAGE_SIZE. */
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    __address base;     /**< Base address of this area. */
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};
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/** Address space structure.
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 *
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 * as_t contains the list of as_areas of userspace accessible
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 * pages for one or more tasks. Ranges of kernel memory pages are not
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 * supposed to figure in the list as they are shared by all tasks and
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 * set up during system initialization.
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 */
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struct as {
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    /** Protected by asidlock. Must be acquired before as->lock. */
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    link_t inactive_as_with_asid_link;
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    SPINLOCK_DECLARE(lock);
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    /** Number of processors on wich is this address space active. */
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    count_t refcount;
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    /** B+tree of address space areas. */
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    btree_t as_area_btree;
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    /** Page table pointer. Constant on architectures that use global page hash table. */
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    pte_t *page_table;
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    /** Address space identifier. Constant on architectures that do not support ASIDs.*/
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    asid_t asid;
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};
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struct as_operations {
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    pte_t *(* page_table_create)(int flags);
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    void (* page_table_lock)(as_t *as, bool lock);
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    void (* page_table_unlock)(as_t *as, bool unlock);
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};
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typedef struct as_operations as_operations_t;
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extern as_t *AS_KERNEL;
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extern as_operations_t *as_operations;
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extern spinlock_t as_lock;
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extern link_t inactive_as_with_asid_head;
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extern void as_init(void);
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extern as_t *as_create(int flags);
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extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base);
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extern __address as_area_resize(as_t *as, __address address, size_t size, int flags);
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extern void as_set_mapping(as_t *as, __address page, __address frame);
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extern int as_page_fault(__address page);
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extern void as_switch(as_t *old, as_t *new);
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extern void as_free(as_t *as);
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/* Interface to be implemented by architectures. */
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#ifndef as_install_arch
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extern void as_install_arch(as_t *as);
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#endif /* !def as_install_arch */
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#endif