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| /* |
| * 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. |
| */ |
| |
| /** @addtogroup genericmm |
| * @{ |
| */ |
| /** @file |
| */ |
| |
| #ifndef __AS_H__ |
| #define __AS_H__ |
| |
| /** Address space area flags. */ |
| #define AS_AREA_READ 1 |
| #define AS_AREA_WRITE 2 |
| #define AS_AREA_EXEC 4 |
| #define AS_AREA_CACHEABLE 8 |
| |
| #ifdef KERNEL |
| |
| #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 <synch/mutex.h> |
| #include <adt/list.h> |
| #include <adt/btree.h> |
| #include <elf.h> |
| |
| /** 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 |
| |
| #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 USTACK_ADDRESS USTACK_ADDRESS_ARCH |
| |
| #define FLAG_AS_KERNEL (1 << 0) /**< Kernel address space. */ |
| |
| /** 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. */ |
| link_t inactive_as_with_asid_link; |
| |
| mutex_t lock; |
| |
| /** Number of references (i.e tasks that reference this as). */ |
| count_t refcount; |
| |
| /** Number of processors on wich is this address space active. */ |
| count_t cpu_refcount; |
| |
| /** B+tree of address space areas. */ |
| btree_t as_area_btree; |
| |
| /** Page table pointer. Constant on architectures that use global page hash table. */ |
| pte_t *page_table; |
| |
| /** Address space identifier. Constant on architectures that do not support ASIDs.*/ |
| asid_t asid; |
| }; |
| |
| struct as_operations { |
| pte_t *(* page_table_create)(int flags); |
| void (* page_table_destroy)(pte_t *page_table); |
| 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; |
| |
| /** Address space area attributes. */ |
| #define AS_AREA_ATTR_NONE 0 |
| #define AS_AREA_ATTR_PARTIAL 1 /**< Not fully initialized area. */ |
| |
| #define AS_PF_FAULT 0 /**< The page fault was not resolved by as_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() |
| or memcpy_to_uspace(). */ |
| |
| /** This structure contains information associated with the shared address space area. */ |
| typedef struct { |
| mutex_t lock; /**< This lock must be acquired only when the as_area lock is held. */ |
| count_t refcount; /**< This structure can be deallocated if refcount drops to 0. */ |
| btree_t pagemap; /**< B+tree containing complete map of anonymous pages of the shared area. */ |
| } share_info_t; |
| |
| /** Address space area backend structure. */ |
| typedef struct { |
| int (* page_fault)(as_area_t *area, uintptr_t addr, pf_access_t access); |
| void (* frame_free)(as_area_t *area, uintptr_t page, uintptr_t frame); |
| void (* share)(as_area_t *area); |
| } mem_backend_t; |
| |
| /** Backend data stored in address space area. */ |
| typedef union { |
| struct { /**< elf_backend members */ |
| elf_header_t *elf; |
| elf_segment_header_t *segment; |
| }; |
| struct { /**< phys_backend members */ |
| uintptr_t base; |
| count_t frames; |
| }; |
| } mem_backend_data_t; |
| |
| /** 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 { |
| mutex_t lock; |
| as_t *as; /**< Containing address space. */ |
| 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. */ |
| uintptr_t base; /**< Base address of this area. */ |
| btree_t used_space; /**< Map of used space. */ |
| share_info_t *sh_info; /**< If the address space area has been shared, this pointer will |
| reference the share info structure. */ |
| mem_backend_t *backend; /**< Memory backend backing this address space area. */ |
| |
| /** Data to be used by the backend. */ |
| mem_backend_data_t backend_data; |
| }; |
| |
| extern as_t *AS_KERNEL; |
| extern as_operations_t *as_operations; |
| |
| extern spinlock_t inactive_as_with_asid_lock; |
| extern link_t inactive_as_with_asid_head; |
| |
| extern void as_init(void); |
| |
| extern as_t *as_create(int flags); |
| extern void as_destroy(as_t *as); |
| extern void as_switch(as_t *old, as_t *new); |
| extern int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate); |
| |
| extern as_area_t *as_area_create(as_t *as, int flags, size_t size, uintptr_t base, int attrs, |
| mem_backend_t *backend, mem_backend_data_t *backend_data); |
| extern int as_area_destroy(as_t *as, uintptr_t address); |
| extern int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags); |
| int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size, |
| as_t *dst_as, uintptr_t dst_base, int dst_flags_mask); |
| |
| extern int as_area_get_flags(as_area_t *area); |
| extern bool as_area_check_access(as_area_t *area, pf_access_t access); |
| extern size_t as_get_size(uintptr_t base); |
| extern int used_space_insert(as_area_t *a, uintptr_t page, count_t count); |
| extern int used_space_remove(as_area_t *a, uintptr_t page, count_t count); |
| |
| /* Interface to be implemented by architectures. */ |
| #ifndef as_install_arch |
| extern void as_install_arch(as_t *as); |
| #endif /* !def as_install_arch */ |
| |
| /* Backend declarations. */ |
| extern mem_backend_t anon_backend; |
| extern mem_backend_t elf_backend; |
| extern mem_backend_t phys_backend; |
| |
| /* Address space area related syscalls. */ |
| extern unative_t sys_as_area_create(uintptr_t address, size_t size, int flags); |
| extern unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags); |
| extern unative_t sys_as_area_destroy(uintptr_t address); |
| |
| #endif /* KERNEL */ |
| |
| #endif |
| |
| /** @} |
| */ |
| |