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1/*
2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include <linux/module.h>
7#include <linux/bootmem.h>
8#include <linux/mm.h>
9#include <linux/pfn.h>
10#include <asm/page.h>
11#include <as-layout.h>
12#include <init.h>
13#include <kern.h>
14#include <mem_user.h>
15#include <os.h>
16
17static int physmem_fd = -1;
18
19/* Changed during early boot */
20unsigned long high_physmem;
21EXPORT_SYMBOL(high_physmem);
22
23extern unsigned long long physmem_size;
24
25int __init init_maps(unsigned long physmem, unsigned long iomem,
26 unsigned long highmem)
27{
28 struct page *p, *map;
29 unsigned long phys_len, phys_pages, highmem_len, highmem_pages;
30 unsigned long iomem_len, iomem_pages, total_len, total_pages;
31 int i;
32
33 phys_pages = physmem >> PAGE_SHIFT;
34 phys_len = phys_pages * sizeof(struct page);
35
36 iomem_pages = iomem >> PAGE_SHIFT;
37 iomem_len = iomem_pages * sizeof(struct page);
38
39 highmem_pages = highmem >> PAGE_SHIFT;
40 highmem_len = highmem_pages * sizeof(struct page);
41
42 total_pages = phys_pages + iomem_pages + highmem_pages;
43 total_len = phys_len + iomem_len + highmem_len;
44
45 map = alloc_bootmem_low_pages(total_len);
46 if (map == NULL)
47 return -ENOMEM;
48
49 for (i = 0; i < total_pages; i++) {
50 p = &map[i];
51 memset(p, 0, sizeof(struct page));
52 SetPageReserved(p);
53 INIT_LIST_HEAD(&p->lru);
54 }
55
56 max_mapnr = total_pages;
57 return 0;
58}
59
60void map_memory(unsigned long virt, unsigned long phys, unsigned long len,
61 int r, int w, int x)
62{
63 __u64 offset;
64 int fd, err;
65
66 fd = phys_mapping(phys, &offset);
67 err = os_map_memory((void *) virt, fd, offset, len, r, w, x);
68 if (err) {
69 if (err == -ENOMEM)
70 printk(KERN_ERR "try increasing the host's "
71 "/proc/sys/vm/max_map_count to <physical "
72 "memory size>/4096\n");
73 panic("map_memory(0x%lx, %d, 0x%llx, %ld, %d, %d, %d) failed, "
74 "err = %d\n", virt, fd, offset, len, r, w, x, err);
75 }
76}
77
78extern int __syscall_stub_start;
79
80void __init setup_physmem(unsigned long start, unsigned long reserve_end,
81 unsigned long len, unsigned long long highmem)
82{
83 unsigned long reserve = reserve_end - start;
84 int pfn = PFN_UP(__pa(reserve_end));
85 int delta = (len - reserve) >> PAGE_SHIFT;
86 int err, offset, bootmap_size;
87
88 physmem_fd = create_mem_file(len + highmem);
89
90 offset = uml_reserved - uml_physmem;
91 err = os_map_memory((void *) uml_reserved, physmem_fd, offset,
92 len - offset, 1, 1, 1);
93 if (err < 0) {
94 printf("setup_physmem - mapping %ld bytes of memory at 0x%p "
95 "failed - errno = %d\n", len - offset,
96 (void *) uml_reserved, err);
97 exit(1);
98 }
99
100 /*
101 * Special kludge - This page will be mapped in to userspace processes
102 * from physmem_fd, so it needs to be written out there.
103 */
104 os_seek_file(physmem_fd, __pa(&__syscall_stub_start));
105 os_write_file(physmem_fd, &__syscall_stub_start, PAGE_SIZE);
106
107 bootmap_size = init_bootmem(pfn, pfn + delta);
108 free_bootmem(__pa(reserve_end) + bootmap_size,
109 len - bootmap_size - reserve);
110}
111
112int phys_mapping(unsigned long phys, unsigned long long *offset_out)
113{
114 int fd = -1;
115
116 if (phys < physmem_size) {
117 fd = physmem_fd;
118 *offset_out = phys;
119 }
120 else if (phys < __pa(end_iomem)) {
121 struct iomem_region *region = iomem_regions;
122
123 while (region != NULL) {
124 if ((phys >= region->phys) &&
125 (phys < region->phys + region->size)) {
126 fd = region->fd;
127 *offset_out = phys - region->phys;
128 break;
129 }
130 region = region->next;
131 }
132 }
133 else if (phys < __pa(end_iomem) + highmem) {
134 fd = physmem_fd;
135 *offset_out = phys - iomem_size;
136 }
137
138 return fd;
139}
140
141static int __init uml_mem_setup(char *line, int *add)
142{
143 char *retptr;
144 physmem_size = memparse(line,&retptr);
145 return 0;
146}
147__uml_setup("mem=", uml_mem_setup,
148"mem=<Amount of desired ram>\n"
149" This controls how much \"physical\" memory the kernel allocates\n"
150" for the system. The size is specified as a number followed by\n"
151" one of 'k', 'K', 'm', 'M', which have the obvious meanings.\n"
152" This is not related to the amount of memory in the host. It can\n"
153" be more, and the excess, if it's ever used, will just be swapped out.\n"
154" Example: mem=64M\n\n"
155);
156
157extern int __init parse_iomem(char *str, int *add);
158
159__uml_setup("iomem=", parse_iomem,
160"iomem=<name>,<file>\n"
161" Configure <file> as an IO memory region named <name>.\n\n"
162);
163
164/*
165 * This list is constructed in parse_iomem and addresses filled in in
166 * setup_iomem, both of which run during early boot. Afterwards, it's
167 * unchanged.
168 */
169struct iomem_region *iomem_regions;
170
171/* Initialized in parse_iomem and unchanged thereafter */
172int iomem_size;
173
174unsigned long find_iomem(char *driver, unsigned long *len_out)
175{
176 struct iomem_region *region = iomem_regions;
177
178 while (region != NULL) {
179 if (!strcmp(region->driver, driver)) {
180 *len_out = region->size;
181 return region->virt;
182 }
183
184 region = region->next;
185 }
186
187 return 0;
188}
189EXPORT_SYMBOL(find_iomem);
190
191static int setup_iomem(void)
192{
193 struct iomem_region *region = iomem_regions;
194 unsigned long iomem_start = high_physmem + PAGE_SIZE;
195 int err;
196
197 while (region != NULL) {
198 err = os_map_memory((void *) iomem_start, region->fd, 0,
199 region->size, 1, 1, 0);
200 if (err)
201 printk(KERN_ERR "Mapping iomem region for driver '%s' "
202 "failed, errno = %d\n", region->driver, -err);
203 else {
204 region->virt = iomem_start;
205 region->phys = __pa(region->virt);
206 }
207
208 iomem_start += region->size + PAGE_SIZE;
209 region = region->next;
210 }
211
212 return 0;
213}
214
215__initcall(setup_iomem);
1/*
2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include "linux/bootmem.h"
7#include "linux/mm.h"
8#include "linux/pfn.h"
9#include "asm/page.h"
10#include "as-layout.h"
11#include "init.h"
12#include "kern.h"
13#include "mem_user.h"
14#include "os.h"
15
16static int physmem_fd = -1;
17
18/* Changed during early boot */
19unsigned long high_physmem;
20
21extern unsigned long long physmem_size;
22
23int __init init_maps(unsigned long physmem, unsigned long iomem,
24 unsigned long highmem)
25{
26 struct page *p, *map;
27 unsigned long phys_len, phys_pages, highmem_len, highmem_pages;
28 unsigned long iomem_len, iomem_pages, total_len, total_pages;
29 int i;
30
31 phys_pages = physmem >> PAGE_SHIFT;
32 phys_len = phys_pages * sizeof(struct page);
33
34 iomem_pages = iomem >> PAGE_SHIFT;
35 iomem_len = iomem_pages * sizeof(struct page);
36
37 highmem_pages = highmem >> PAGE_SHIFT;
38 highmem_len = highmem_pages * sizeof(struct page);
39
40 total_pages = phys_pages + iomem_pages + highmem_pages;
41 total_len = phys_len + iomem_len + highmem_len;
42
43 map = alloc_bootmem_low_pages(total_len);
44 if (map == NULL)
45 return -ENOMEM;
46
47 for (i = 0; i < total_pages; i++) {
48 p = &map[i];
49 memset(p, 0, sizeof(struct page));
50 SetPageReserved(p);
51 INIT_LIST_HEAD(&p->lru);
52 }
53
54 max_mapnr = total_pages;
55 return 0;
56}
57
58void map_memory(unsigned long virt, unsigned long phys, unsigned long len,
59 int r, int w, int x)
60{
61 __u64 offset;
62 int fd, err;
63
64 fd = phys_mapping(phys, &offset);
65 err = os_map_memory((void *) virt, fd, offset, len, r, w, x);
66 if (err) {
67 if (err == -ENOMEM)
68 printk(KERN_ERR "try increasing the host's "
69 "/proc/sys/vm/max_map_count to <physical "
70 "memory size>/4096\n");
71 panic("map_memory(0x%lx, %d, 0x%llx, %ld, %d, %d, %d) failed, "
72 "err = %d\n", virt, fd, offset, len, r, w, x, err);
73 }
74}
75
76extern int __syscall_stub_start;
77
78void __init setup_physmem(unsigned long start, unsigned long reserve_end,
79 unsigned long len, unsigned long long highmem)
80{
81 unsigned long reserve = reserve_end - start;
82 int pfn = PFN_UP(__pa(reserve_end));
83 int delta = (len - reserve) >> PAGE_SHIFT;
84 int err, offset, bootmap_size;
85
86 physmem_fd = create_mem_file(len + highmem);
87
88 offset = uml_reserved - uml_physmem;
89 err = os_map_memory((void *) uml_reserved, physmem_fd, offset,
90 len - offset, 1, 1, 1);
91 if (err < 0) {
92 printf("setup_physmem - mapping %ld bytes of memory at 0x%p "
93 "failed - errno = %d\n", len - offset,
94 (void *) uml_reserved, err);
95 exit(1);
96 }
97
98 /*
99 * Special kludge - This page will be mapped in to userspace processes
100 * from physmem_fd, so it needs to be written out there.
101 */
102 os_seek_file(physmem_fd, __pa(&__syscall_stub_start));
103 os_write_file(physmem_fd, &__syscall_stub_start, PAGE_SIZE);
104
105 bootmap_size = init_bootmem(pfn, pfn + delta);
106 free_bootmem(__pa(reserve_end) + bootmap_size,
107 len - bootmap_size - reserve);
108}
109
110int phys_mapping(unsigned long phys, unsigned long long *offset_out)
111{
112 int fd = -1;
113
114 if (phys < physmem_size) {
115 fd = physmem_fd;
116 *offset_out = phys;
117 }
118 else if (phys < __pa(end_iomem)) {
119 struct iomem_region *region = iomem_regions;
120
121 while (region != NULL) {
122 if ((phys >= region->phys) &&
123 (phys < region->phys + region->size)) {
124 fd = region->fd;
125 *offset_out = phys - region->phys;
126 break;
127 }
128 region = region->next;
129 }
130 }
131 else if (phys < __pa(end_iomem) + highmem) {
132 fd = physmem_fd;
133 *offset_out = phys - iomem_size;
134 }
135
136 return fd;
137}
138
139static int __init uml_mem_setup(char *line, int *add)
140{
141 char *retptr;
142 physmem_size = memparse(line,&retptr);
143 return 0;
144}
145__uml_setup("mem=", uml_mem_setup,
146"mem=<Amount of desired ram>\n"
147" This controls how much \"physical\" memory the kernel allocates\n"
148" for the system. The size is specified as a number followed by\n"
149" one of 'k', 'K', 'm', 'M', which have the obvious meanings.\n"
150" This is not related to the amount of memory in the host. It can\n"
151" be more, and the excess, if it's ever used, will just be swapped out.\n"
152" Example: mem=64M\n\n"
153);
154
155extern int __init parse_iomem(char *str, int *add);
156
157__uml_setup("iomem=", parse_iomem,
158"iomem=<name>,<file>\n"
159" Configure <file> as an IO memory region named <name>.\n\n"
160);
161
162/*
163 * This list is constructed in parse_iomem and addresses filled in in
164 * setup_iomem, both of which run during early boot. Afterwards, it's
165 * unchanged.
166 */
167struct iomem_region *iomem_regions;
168
169/* Initialized in parse_iomem and unchanged thereafter */
170int iomem_size;
171
172unsigned long find_iomem(char *driver, unsigned long *len_out)
173{
174 struct iomem_region *region = iomem_regions;
175
176 while (region != NULL) {
177 if (!strcmp(region->driver, driver)) {
178 *len_out = region->size;
179 return region->virt;
180 }
181
182 region = region->next;
183 }
184
185 return 0;
186}
187
188static int setup_iomem(void)
189{
190 struct iomem_region *region = iomem_regions;
191 unsigned long iomem_start = high_physmem + PAGE_SIZE;
192 int err;
193
194 while (region != NULL) {
195 err = os_map_memory((void *) iomem_start, region->fd, 0,
196 region->size, 1, 1, 0);
197 if (err)
198 printk(KERN_ERR "Mapping iomem region for driver '%s' "
199 "failed, errno = %d\n", region->driver, -err);
200 else {
201 region->virt = iomem_start;
202 region->phys = __pa(region->virt);
203 }
204
205 iomem_start += region->size + PAGE_SIZE;
206 region = region->next;
207 }
208
209 return 0;
210}
211
212__initcall(setup_iomem);