1 /* 2 * Copyright (c) 1985, Avadis Tevanian, Jr., Michael Wayne Young 3 * Copyright (c) 1987 Carnegie-Mellon University 4 * Copyright (c) 1991 Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * The Mach Operating System project at Carnegie-Mellon University. 9 * 10 * The CMU software License Agreement specifies the terms and conditions 11 * for use and redistribution. 12 * 13 * @(#)vm_param.h 7.1 (Berkeley) 12/05/90 14 */ 15 16 /* 17 * Machine independent virtual memory parameters. 18 */ 19 20 #ifndef _VM_PARAM_ 21 #define _VM_PARAM_ 22 23 #ifdef KERNEL 24 #include "machine/vmparam.h" 25 #else 26 #include <machine/vmparam.h> 27 #endif 28 29 /* 30 * This belongs in types.h, but breaks too many existing programs. 31 */ 32 typedef int boolean_t; 33 #define TRUE 1 34 #define FALSE 0 35 36 /* 37 * The machine independent pages are refered to as PAGES. A page 38 * is some number of hardware pages, depending on the target machine. 39 */ 40 41 /* 42 * All references to the size of a page should be done with PAGE_SIZE 43 * or PAGE_SHIFT. The fact they are variables is hidden here so that 44 * we can easily make them constant if we so desire. 45 */ 46 47 #define PAGE_SIZE page_size /* size of page in addressible units */ 48 #define PAGE_SHIFT page_shift /* number of bits to shift for pages */ 49 50 /* 51 * Return values from the VM routines. 52 */ 53 #define KERN_SUCCESS 0 54 #define KERN_INVALID_ADDRESS 1 55 #define KERN_PROTECTION_FAILURE 2 56 #define KERN_NO_SPACE 3 57 #define KERN_INVALID_ARGUMENT 4 58 #define KERN_FAILURE 5 59 #define KERN_RESOURCE_SHORTAGE 6 60 #define KERN_NOT_RECEIVER 7 61 #define KERN_NO_ACCESS 8 62 63 #ifdef ASSEMBLER 64 #else ASSEMBLER 65 /* 66 * Convert addresses to pages and vice versa. 67 * No rounding is used. 68 */ 69 70 #ifdef KERNEL 71 #define atop(x) (((unsigned)(x)) >> page_shift) 72 #define ptoa(x) ((vm_offset_t)((x) << page_shift)) 73 #endif KERNEL 74 75 /* 76 * Round off or truncate to the nearest page. These will work 77 * for either addresses or counts. (i.e. 1 byte rounds to 1 page 78 * bytes. 79 */ 80 81 #ifdef KERNEL 82 #define round_page(x) ((vm_offset_t)((((vm_offset_t)(x)) + page_mask) & ~page_mask)) 83 #define trunc_page(x) ((vm_offset_t)(((vm_offset_t)(x)) & ~page_mask)) 84 #else KERNEL 85 #define round_page(x) ((((vm_offset_t)(x) + (vm_page_size - 1)) / vm_page_size) * vm_page_size) 86 #define trunc_page(x) ((((vm_offset_t)(x)) / vm_page_size) * vm_page_size) 87 #endif KERNEL 88 89 #ifdef KERNEL 90 extern vm_size_t page_size; /* machine independent page size */ 91 extern vm_size_t page_mask; /* page_size - 1; mask for 92 offset within page */ 93 extern int page_shift; /* shift to use for page size */ 94 95 extern vm_size_t mem_size; /* size of physical memory (bytes) */ 96 extern vm_offset_t first_addr; /* first physical page */ 97 extern vm_offset_t last_addr; /* last physical page */ 98 #endif KERNEL 99 100 #endif ASSEMBLER 101 102 #endif _VM_PARAM_ 103