| 1 | /* |
| 2 | * Copyright (c) 1991 Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This code is derived from software contributed to Berkeley by |
| 6 | * The Mach Operating System project at Carnegie-Mellon University. |
| 7 | * |
| 8 | * %sccs.include.redist.c% |
| 9 | * |
| 10 | * @(#)vm_param.h 7.5 (Berkeley) %G% |
| 11 | * |
| 12 | * |
| 13 | * Copyright (c) 1987, 1990 Carnegie-Mellon University. |
| 14 | * All rights reserved. |
| 15 | * |
| 16 | * Authors: Avadis Tevanian, Jr., Michael Wayne Young |
| 17 | * |
| 18 | * Permission to use, copy, modify and distribute this software and |
| 19 | * its documentation is hereby granted, provided that both the copyright |
| 20 | * notice and this permission notice appear in all copies of the |
| 21 | * software, derivative works or modified versions, and any portions |
| 22 | * thereof, and that both notices appear in supporting documentation. |
| 23 | * |
| 24 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" |
| 25 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND |
| 26 | * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. |
| 27 | * |
| 28 | * Carnegie Mellon requests users of this software to return to |
| 29 | * |
| 30 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU |
| 31 | * School of Computer Science |
| 32 | * Carnegie Mellon University |
| 33 | * Pittsburgh PA 15213-3890 |
| 34 | * |
| 35 | * any improvements or extensions that they make and grant Carnegie the |
| 36 | * rights to redistribute these changes. |
| 37 | */ |
| 38 | |
| 39 | /* |
| 40 | * Machine independent virtual memory parameters. |
| 41 | */ |
| 42 | |
| 43 | #ifndef _VM_PARAM_ |
| 44 | #define _VM_PARAM_ |
| 45 | |
| 46 | #ifdef KERNEL |
| 47 | #include "machine/vmparam.h" |
| 48 | #else |
| 49 | #include <machine/vmparam.h> |
| 50 | #endif |
| 51 | |
| 52 | /* |
| 53 | * This belongs in types.h, but breaks too many existing programs. |
| 54 | */ |
| 55 | typedef int boolean_t; |
| 56 | #define TRUE 1 |
| 57 | #define FALSE 0 |
| 58 | |
| 59 | /* |
| 60 | * The machine independent pages are refered to as PAGES. A page |
| 61 | * is some number of hardware pages, depending on the target machine. |
| 62 | */ |
| 63 | #define DEFAULT_PAGE_SIZE 4096 |
| 64 | |
| 65 | /* |
| 66 | * All references to the size of a page should be done with PAGE_SIZE |
| 67 | * or PAGE_SHIFT. The fact they are variables is hidden here so that |
| 68 | * we can easily make them constant if we so desire. |
| 69 | */ |
| 70 | #define PAGE_SIZE cnt.v_page_size /* size of page */ |
| 71 | #define PAGE_MASK page_mask /* size of page - 1 */ |
| 72 | #define PAGE_SHIFT page_shift /* bits to shift for pages */ |
| 73 | #ifdef KERNEL |
| 74 | extern vm_size_t page_mask; |
| 75 | extern int page_shift; |
| 76 | #endif |
| 77 | |
| 78 | |
| 79 | /* |
| 80 | * Return values from the VM routines. |
| 81 | */ |
| 82 | #define KERN_SUCCESS 0 |
| 83 | #define KERN_INVALID_ADDRESS 1 |
| 84 | #define KERN_PROTECTION_FAILURE 2 |
| 85 | #define KERN_NO_SPACE 3 |
| 86 | #define KERN_INVALID_ARGUMENT 4 |
| 87 | #define KERN_FAILURE 5 |
| 88 | #define KERN_RESOURCE_SHORTAGE 6 |
| 89 | #define KERN_NOT_RECEIVER 7 |
| 90 | #define KERN_NO_ACCESS 8 |
| 91 | |
| 92 | #ifdef ASSEMBLER |
| 93 | #else ASSEMBLER |
| 94 | /* |
| 95 | * Convert addresses to pages and vice versa. |
| 96 | * No rounding is used. |
| 97 | */ |
| 98 | |
| 99 | #ifdef KERNEL |
| 100 | #define atop(x) (((unsigned)(x)) >> PAGE_SHIFT) |
| 101 | #define ptoa(x) ((vm_offset_t)((x) << PAGE_SHIFT)) |
| 102 | #endif KERNEL |
| 103 | |
| 104 | /* |
| 105 | * Round off or truncate to the nearest page. These will work |
| 106 | * for either addresses or counts. (i.e. 1 byte rounds to 1 page |
| 107 | * bytes. |
| 108 | */ |
| 109 | |
| 110 | #ifdef KERNEL |
| 111 | #define round_page(x) \ |
| 112 | ((vm_offset_t)((((vm_offset_t)(x)) + PAGE_MASK) & ~PAGE_MASK)) |
| 113 | #define trunc_page(x) \ |
| 114 | ((vm_offset_t)(((vm_offset_t)(x)) & ~PAGE_MASK)) |
| 115 | #define num_pages(x) \ |
| 116 | ((vm_offset_t)((((vm_offset_t)(x)) + PAGE_MASK) >> PAGE_SHIFT)) |
| 117 | #else KERNEL |
| 118 | #define round_page(x) \ |
| 119 | ((((vm_offset_t)(x) + (vm_page_size - 1)) / vm_page_size) * vm_page_size) |
| 120 | #define trunc_page(x) \ |
| 121 | ((((vm_offset_t)(x)) / vm_page_size) * vm_page_size) |
| 122 | #endif KERNEL |
| 123 | |
| 124 | #ifdef KERNEL |
| 125 | extern vm_size_t mem_size; /* size of physical memory (bytes) */ |
| 126 | extern vm_offset_t first_addr; /* first physical page */ |
| 127 | extern vm_offset_t last_addr; /* last physical page */ |
| 128 | #endif KERNEL |
| 129 | |
| 130 | #endif ASSEMBLER |
| 131 | |
| 132 | #endif _VM_PARAM_ |