0,0 → 1,143 |
/* |
* 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__ |
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#include <mm/as_arg.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 <adt/list.h> |
#include <adt/btree.h> |
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/** Defined to be true if user address space and kernel address space shadow each other. */ |
#define KERNEL_ADDRESS_SPACE_SHADOWED KERNEL_ADDRESS_SPACE_SHADOWED_ARCH |
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#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 |
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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. */ |
#define AS_AREA_READ 1 |
#define AS_AREA_WRITE 2 |
#define AS_AREA_EXEC 4 |
#define AS_AREA_DEVICE 8 |
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/** Address space area attributes. */ |
#define AS_AREA_ATTR_NONE 0 |
#define AS_AREA_ATTR_PARTIAL 1 /* Not fully initialized area. */ |
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#define AS_PF_FAULT 0 /**< The page fault was not resolved by asp_page_fault(). */ |
#define AS_PF_OK 1 /**< The page fault was resolved by as_page_fault(). */ |
#define AS_PF_DEFER 2 /**< The page fault was caused by memcpy_from_uspace(). */ |
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/** 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); |
int flags; /**< Flags related to the memory represented by the address space area. */ |
int attributes; /**< Attributes related to the address space area itself. */ |
count_t pages; /**< Size of this area in multiples of PAGE_SIZE. */ |
__address base; /**< Base address of this area. */ |
}; |
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/** 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 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. */ |
count_t refcount; |
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/** B+tree of address space areas. */ |
btree_t as_area_btree; |
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/** Page table pointer. Constant on architectures that use global page hash table. */ |
pte_t *page_table; |
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/** Address space identifier. Constant on architectures that do not support ASIDs.*/ |
asid_t asid; |
}; |
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struct as_operations { |
pte_t *(* page_table_create)(int flags); |
void (* page_table_lock)(as_t *as, bool lock); |
void (* page_table_unlock)(as_t *as, bool unlock); |
}; |
typedef struct as_operations as_operations_t; |
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extern as_t *AS_KERNEL; |
extern as_operations_t *as_operations; |
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extern spinlock_t as_lock; |
extern link_t inactive_as_with_asid_head; |
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extern void as_init(void); |
extern as_t *as_create(int flags); |
extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base, int attrs); |
extern __address as_area_resize(as_t *as, __address address, size_t size, int flags); |
int as_area_send(task_id_t dst_id, __address base); |
extern void as_set_mapping(as_t *as, __address page, __address frame); |
extern int as_page_fault(__address page, istate_t *istate); |
extern void as_switch(as_t *old, as_t *new); |
extern void as_free(as_t *as); |
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/* Interface to be implemented by architectures. */ |
#ifndef as_install_arch |
extern void as_install_arch(as_t *as); |
#endif /* !def as_install_arch */ |
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/* Address space area related syscalls. */ |
extern __native sys_as_area_create(__address address, size_t size, int flags); |
extern __native sys_as_area_resize(__address address, size_t size, int flags); |
extern __native sys_as_area_accept(as_area_acptsnd_arg_t *uspace_accept_arg); |
extern __native sys_as_area_send(as_area_acptsnd_arg_t *uspace_send_arg); |
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#endif |