![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to vm_mem_region.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Apple Darwin 0.x] / kernel / vm|
Return to vm_mem_region.c CVS log | Up to [Apple Darwin 0.x] / kernel / vm |
1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /* Copyright (c) 1991 NeXT Computer, Inc. All rights reserved.
26: *
27: * File: vm/vm_mem_region.c
28: *
29: * This file contains machine independent code for managing
30: * physical memory regions.
31: *
32: * 18-Mar-91 Mike DeMoney and Peter King ([email protected])
33: * Created.
34: */
35: #import <kern/assert.h>
36: #import <mach/vm_param.h>
37: #import <vm/vm_page.h>
38: #import <kernserv/macro_help.h>
39: #import <kern/assert.h>
40:
41: /*
42: * vm_mem_ppi -- convert a physical page number into a phys page index.
43: * Returns the page ordinal in the set of "populated" pages.
44: */
45: unsigned vm_mem_ppi(vm_offset_t pa)
46: {
47: mem_region_t region;
48: unsigned pages_so_far;
49:
50: pages_so_far = 0;
51: for (region = &mem_region[0]; region < &mem_region[num_regions];
52: region++) {
53: if (pa >= region->first_phys_addr
54: && pa < region->last_phys_addr) {
55: return (pages_so_far +
56: atop(pa - region->first_phys_addr));
57: }
58: ASSERT(region->num_pages == atop(region->last_phys_addr
59: - region->first_phys_addr));
60: pages_so_far += region->num_pages;
61: }
62: panic("mem_ppi");
63: /*NOTREACHED*/
64: }
65:
66: boolean_t vm_valid_page(
67: vm_offset_t pa
68: ) {
69: mem_region_t region;
70:
71: for (region = &mem_region[0]; region < &mem_region[num_regions];
72: region++) {
73: if (pa >= region->first_phys_addr
74: && pa < region->last_phys_addr) {
75: return TRUE;
76: }
77: }
78: return FALSE;
79: }
80:
81: /*
82: * vm_phys_to_vm_page:
83: *
84: * Translates physical address to vm_page pointer.
85: */
86: vm_page_t vm_phys_to_vm_page (vm_offset_t pa)
87: {
88: mem_region_t rp;
89:
90: for (rp = mem_region; rp < &mem_region[num_regions]; rp += 1) {
91: if (pa >= rp->first_phys_addr && pa < rp->last_phys_addr) {
92: return &rp->vm_page_array[atop(pa) - rp->first_page];
93: }
94: }
95: return 0;
96: }
97:
98: /*
99: * vm_region_to_vm_page:
100: *
101: * Translates physical address to vm_page pointer.
102: */
103: vm_page_t
104: vm_region_to_vm_page (pa)
105: register vm_offset_t pa;
106: {
107: return (vm_phys_to_vm_page(pa));
108: }
109:
110: vm_offset_t vm_alloc_from_regions(
111: vm_size_t size,
112: vm_size_t align
113: ) {
114: vm_offset_t first_addr;
115: mem_region_t rp;
116: extern
117: vm_offset_t virtual_avail;
118:
119: /* Alignment must be power of 2 */
120: ASSERT((align & (align - 1)) == 0);
121:
122: /*
123: * Search for region with enough space.
124: * Simple first fit for now.
125: */
126: for (rp = mem_region; rp < &mem_region[num_regions]; rp += 1) {
127:
128: /* Align current first_addr to requested alignment */
129: first_addr = ((rp->first_phys_addr + (align - 1))
130: & ~(align - 1));
131:
132: if (first_addr + size <= rp->last_phys_addr) {
133: rp->first_phys_addr = first_addr + size;
134: #ifdef ppc
135: if (round_page(rp->first_phys_addr) > virtual_avail)
136: virtual_avail = round_page(rp->first_phys_addr);
137: #endif
138:
139: return (vm_offset_t) first_addr;
140: }
141: }
142: panic("vm_mem_alloc_from_regions");
143: /*NOTREACHED*/
144: }
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.