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| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | #ifndef __VM_H__ |
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| 30 | #define __VM_H__ |
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| 31 | |||
| 32 | #include <arch/mm/vm.h> |
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| 33 | #include <arch/types.h> |
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| 34 | #include <typedefs.h> |
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| 35 | #include <synch/spinlock.h> |
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| 36 | #include <list.h> |
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| 37 | |||
| 38 | #define KERNEL_ADDRESS_SPACE_START KERNEL_ADDRESS_SPACE_START_ARCH |
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| 39 | #define KERNEL_ADDRESS_SPACE_END KERNEL_ADDRESS_SPACE_END_ARCH |
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| 40 | #define USER_ADDRESS_SPACE_START USER_ADDRESS_SPACE_START_ARCH |
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| 41 | #define USER_ADDRESS_SPACE_END USER_ADDRESS_SPACE_END_ARCH |
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| 42 | |||
| 43 | #define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END) |
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| 44 | |||
| 45 | #define UTEXT_ADDRESS UTEXT_ADDRESS_ARCH |
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| 46 | #define USTACK_ADDRESS USTACK_ADDRESS_ARCH |
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| 47 | #define UDATA_ADDRESS UDATA_ADDRESS_ARCH |
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| 48 | |||
| 49 | enum vm_type { |
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| 50 | VMA_TEXT = 1, VMA_DATA, VMA_STACK |
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| 51 | }; |
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| 52 | |||
| 53 | /* |
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| 54 | * Each vm_area structure describes one continuous area of virtual memory. |
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| 55 | * In the future, it should not be difficult to support shared areas of vm. |
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| 56 | */ |
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| 57 | struct vm_area { |
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| 58 | spinlock_t lock; |
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| 59 | link_t link; |
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| 60 | vm_type_t type; |
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| 61 | int size; |
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| 62 | __address address; |
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| 63 | __address *mapping; |
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| 64 | }; |
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| 65 | |||
| 66 | /* |
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| 67 | * vm_mapping_t contains the list of vm_areas of userspace accessible |
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| 68 | * pages for one or more tasks. Ranges of kernel memory pages are not |
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| 69 | * supposed to figure in the list as they are shared by all tasks and |
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| 70 | * set up during system initialization. |
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| 71 | */ |
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| 72 | struct vm { |
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| 73 | spinlock_t lock; |
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| 74 | link_t vm_area_head; |
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| 75 | }; |
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| 76 | |||
| 77 | extern vm_t * vm_create(void); |
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| 78 | extern void vm_destroy(vm_t *m); |
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| 79 | |||
| 80 | extern vm_area_t *vm_area_create(vm_t *m, vm_type_t type, int size, __address addr); |
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| 81 | extern void vm_area_destroy(vm_area_t *a); |
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| 82 | |||
| 83 | extern void vm_area_map(vm_area_t *a); |
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| 84 | extern void vm_area_unmap(vm_area_t *a); |
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| 85 | |||
| 86 | extern void vm_install(vm_t *m); |
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| 87 | extern void vm_uninstall(vm_t *m); |
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| 88 | |||
| 89 | #endif |