Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
6d536e4b | 2 | * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
73395a00 AV |
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> | |
1da177e4 | 16 | |
1da177e4 LT |
17 | static int physmem_fd = -1; |
18 | ||
1da177e4 LT |
19 | /* Changed during early boot */ |
20 | unsigned long high_physmem; | |
73395a00 | 21 | EXPORT_SYMBOL(high_physmem); |
1da177e4 | 22 | |
ae173816 | 23 | extern unsigned long long physmem_size; |
1da177e4 | 24 | |
97a1fcbb JD |
25 | int __init init_maps(unsigned long physmem, unsigned long iomem, |
26 | unsigned long highmem) | |
1da177e4 LT |
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; | |
3dfd95b3 | 43 | total_len = phys_len + iomem_len + highmem_len; |
1da177e4 | 44 | |
97a1fcbb | 45 | map = alloc_bootmem_low_pages(total_len); |
6d536e4b | 46 | if (map == NULL) |
60678bbc | 47 | return -ENOMEM; |
1da177e4 | 48 | |
6d536e4b | 49 | for (i = 0; i < total_pages; i++) { |
1da177e4 | 50 | p = &map[i]; |
70dc991d | 51 | memset(p, 0, sizeof(struct page)); |
1da177e4 LT |
52 | SetPageReserved(p); |
53 | INIT_LIST_HEAD(&p->lru); | |
54 | } | |
55 | ||
56 | max_mapnr = total_pages; | |
60678bbc | 57 | return 0; |
1da177e4 LT |
58 | } |
59 | ||
1da177e4 LT |
60 | void 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); | |
6d536e4b JD |
68 | if (err) { |
69 | if (err == -ENOMEM) | |
ba180fd4 | 70 | printk(KERN_ERR "try increasing the host's " |
1da177e4 LT |
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 | ||
23bbd586 | 78 | extern int __syscall_stub_start; |
d67b569f | 79 | |
97a1fcbb JD |
80 | void __init setup_physmem(unsigned long start, unsigned long reserve_end, |
81 | unsigned long len, unsigned long long highmem) | |
1da177e4 LT |
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, | |
5c8aacea | 92 | len - offset, 1, 1, 1); |
6d536e4b | 93 | if (err < 0) { |
512b6fb1 JD |
94 | printf("setup_physmem - mapping %ld bytes of memory at 0x%p " |
95 | "failed - errno = %d\n", len - offset, | |
96 | (void *) uml_reserved, err); | |
1da177e4 LT |
97 | exit(1); |
98 | } | |
99 | ||
ba180fd4 JD |
100 | /* |
101 | * Special kludge - This page will be mapped in to userspace processes | |
d67b569f JD |
102 | * from physmem_fd, so it needs to be written out there. |
103 | */ | |
104 | os_seek_file(physmem_fd, __pa(&__syscall_stub_start)); | |
a6ea4cce | 105 | os_write_file(physmem_fd, &__syscall_stub_start, PAGE_SIZE); |
d67b569f | 106 | |
1da177e4 LT |
107 | bootmap_size = init_bootmem(pfn, pfn + delta); |
108 | free_bootmem(__pa(reserve_end) + bootmap_size, | |
109 | len - bootmap_size - reserve); | |
110 | } | |
111 | ||
0a7675aa | 112 | int phys_mapping(unsigned long phys, unsigned long long *offset_out) |
1da177e4 | 113 | { |
1da177e4 LT |
114 | int fd = -1; |
115 | ||
6d536e4b | 116 | if (phys < physmem_size) { |
1da177e4 LT |
117 | fd = physmem_fd; |
118 | *offset_out = phys; | |
119 | } | |
6d536e4b | 120 | else if (phys < __pa(end_iomem)) { |
1da177e4 LT |
121 | struct iomem_region *region = iomem_regions; |
122 | ||
6d536e4b JD |
123 | while (region != NULL) { |
124 | if ((phys >= region->phys) && | |
125 | (phys < region->phys + region->size)) { | |
1da177e4 LT |
126 | fd = region->fd; |
127 | *offset_out = phys - region->phys; | |
128 | break; | |
129 | } | |
130 | region = region->next; | |
131 | } | |
132 | } | |
6d536e4b | 133 | else if (phys < __pa(end_iomem) + highmem) { |
1da177e4 LT |
134 | fd = physmem_fd; |
135 | *offset_out = phys - iomem_size; | |
136 | } | |
137 | ||
60678bbc | 138 | return fd; |
1da177e4 LT |
139 | } |
140 | ||
141 | static 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 | ||
94c282d7 JD |
157 | extern 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 | */ | |
80e39311 | 169 | struct iomem_region *iomem_regions; |
94c282d7 | 170 | |
80e39311 JD |
171 | /* Initialized in parse_iomem and unchanged thereafter */ |
172 | int iomem_size; | |
94c282d7 | 173 | |
1da177e4 LT |
174 | unsigned long find_iomem(char *driver, unsigned long *len_out) |
175 | { | |
176 | struct iomem_region *region = iomem_regions; | |
177 | ||
6d536e4b JD |
178 | while (region != NULL) { |
179 | if (!strcmp(region->driver, driver)) { | |
1da177e4 | 180 | *len_out = region->size; |
60678bbc | 181 | return region->virt; |
1da177e4 | 182 | } |
c39e50b4 VV |
183 | |
184 | region = region->next; | |
1da177e4 LT |
185 | } |
186 | ||
60678bbc | 187 | return 0; |
1da177e4 | 188 | } |
73395a00 | 189 | EXPORT_SYMBOL(find_iomem); |
1da177e4 | 190 | |
99764fa4 | 191 | static int setup_iomem(void) |
1da177e4 LT |
192 | { |
193 | struct iomem_region *region = iomem_regions; | |
194 | unsigned long iomem_start = high_physmem + PAGE_SIZE; | |
195 | int err; | |
196 | ||
6d536e4b | 197 | while (region != NULL) { |
1da177e4 LT |
198 | err = os_map_memory((void *) iomem_start, region->fd, 0, |
199 | region->size, 1, 1, 0); | |
6d536e4b | 200 | if (err) |
ba180fd4 JD |
201 | printk(KERN_ERR "Mapping iomem region for driver '%s' " |
202 | "failed, errno = %d\n", region->driver, -err); | |
1da177e4 LT |
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 | ||
60678bbc | 212 | return 0; |
1da177e4 LT |
213 | } |
214 | ||
215 | __initcall(setup_iomem); |