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 | |
9e6a57d2 | 25 | void __init mem_total_pages(unsigned long physmem, unsigned long iomem, |
97a1fcbb | 26 | unsigned long highmem) |
1da177e4 | 27 | { |
9e6a57d2 HL |
28 | unsigned long phys_pages, highmem_pages; |
29 | unsigned long iomem_pages, total_pages; | |
1da177e4 | 30 | |
9e6a57d2 HL |
31 | phys_pages = physmem >> PAGE_SHIFT; |
32 | iomem_pages = iomem >> PAGE_SHIFT; | |
1da177e4 | 33 | highmem_pages = highmem >> PAGE_SHIFT; |
1da177e4 | 34 | |
9e6a57d2 | 35 | total_pages = phys_pages + iomem_pages + highmem_pages; |
1da177e4 LT |
36 | |
37 | max_mapnr = total_pages; | |
1da177e4 LT |
38 | } |
39 | ||
1da177e4 LT |
40 | void map_memory(unsigned long virt, unsigned long phys, unsigned long len, |
41 | int r, int w, int x) | |
42 | { | |
43 | __u64 offset; | |
44 | int fd, err; | |
45 | ||
46 | fd = phys_mapping(phys, &offset); | |
47 | err = os_map_memory((void *) virt, fd, offset, len, r, w, x); | |
6d536e4b JD |
48 | if (err) { |
49 | if (err == -ENOMEM) | |
ba180fd4 | 50 | printk(KERN_ERR "try increasing the host's " |
1da177e4 LT |
51 | "/proc/sys/vm/max_map_count to <physical " |
52 | "memory size>/4096\n"); | |
53 | panic("map_memory(0x%lx, %d, 0x%llx, %ld, %d, %d, %d) failed, " | |
54 | "err = %d\n", virt, fd, offset, len, r, w, x, err); | |
55 | } | |
56 | } | |
57 | ||
23bbd586 | 58 | extern int __syscall_stub_start; |
d67b569f | 59 | |
fe205bdd TM |
60 | /** |
61 | * setup_physmem() - Setup physical memory for UML | |
62 | * @start: Start address of the physical kernel memory, | |
63 | * i.e start address of the executable image. | |
64 | * @reserve_end: end address of the physical kernel memory. | |
65 | * @len: Length of total physical memory that should be mapped/made | |
66 | * available, in bytes. | |
67 | * @highmem: Number of highmem bytes that should be mapped/made available. | |
68 | * | |
69 | * Creates an unlinked temporary file of size (len + highmem) and memory maps | |
70 | * it on the last executable image address (uml_reserved). | |
71 | * | |
72 | * The offset is needed as the length of the total physical memory | |
73 | * (len + highmem) includes the size of the memory used be the executable image, | |
74 | * but the mapped-to address is the last address of the executable image | |
75 | * (uml_reserved == end address of executable image). | |
76 | * | |
77 | * The memory mapped memory of the temporary file is used as backing memory | |
78 | * of all user space processes/kernel tasks. | |
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; | |
fe205bdd TM |
84 | unsigned long pfn = PFN_UP(__pa(reserve_end)); |
85 | unsigned long delta = (len - reserve) >> PAGE_SHIFT; | |
86 | unsigned long offset, bootmap_size; | |
87 | long map_size; | |
88 | int err; | |
89 | ||
90 | offset = uml_reserved - uml_physmem; | |
91 | map_size = len - offset; | |
92 | if(map_size <= 0) { | |
93 | printf("Too few physical memory! Needed=%d, given=%d\n", | |
94 | offset, len); | |
95 | exit(1); | |
96 | } | |
1da177e4 LT |
97 | |
98 | physmem_fd = create_mem_file(len + highmem); | |
99 | ||
1da177e4 | 100 | err = os_map_memory((void *) uml_reserved, physmem_fd, offset, |
fe205bdd | 101 | map_size, 1, 1, 1); |
6d536e4b | 102 | if (err < 0) { |
512b6fb1 | 103 | printf("setup_physmem - mapping %ld bytes of memory at 0x%p " |
fe205bdd | 104 | "failed - errno = %d\n", map_size, |
512b6fb1 | 105 | (void *) uml_reserved, err); |
1da177e4 LT |
106 | exit(1); |
107 | } | |
108 | ||
ba180fd4 JD |
109 | /* |
110 | * Special kludge - This page will be mapped in to userspace processes | |
d67b569f JD |
111 | * from physmem_fd, so it needs to be written out there. |
112 | */ | |
113 | os_seek_file(physmem_fd, __pa(&__syscall_stub_start)); | |
a6ea4cce | 114 | os_write_file(physmem_fd, &__syscall_stub_start, PAGE_SIZE); |
0565103d | 115 | os_fsync_file(physmem_fd); |
d67b569f | 116 | |
1da177e4 LT |
117 | bootmap_size = init_bootmem(pfn, pfn + delta); |
118 | free_bootmem(__pa(reserve_end) + bootmap_size, | |
119 | len - bootmap_size - reserve); | |
120 | } | |
121 | ||
0a7675aa | 122 | int phys_mapping(unsigned long phys, unsigned long long *offset_out) |
1da177e4 | 123 | { |
1da177e4 LT |
124 | int fd = -1; |
125 | ||
6d536e4b | 126 | if (phys < physmem_size) { |
1da177e4 LT |
127 | fd = physmem_fd; |
128 | *offset_out = phys; | |
129 | } | |
6d536e4b | 130 | else if (phys < __pa(end_iomem)) { |
1da177e4 LT |
131 | struct iomem_region *region = iomem_regions; |
132 | ||
6d536e4b JD |
133 | while (region != NULL) { |
134 | if ((phys >= region->phys) && | |
135 | (phys < region->phys + region->size)) { | |
1da177e4 LT |
136 | fd = region->fd; |
137 | *offset_out = phys - region->phys; | |
138 | break; | |
139 | } | |
140 | region = region->next; | |
141 | } | |
142 | } | |
6d536e4b | 143 | else if (phys < __pa(end_iomem) + highmem) { |
1da177e4 LT |
144 | fd = physmem_fd; |
145 | *offset_out = phys - iomem_size; | |
146 | } | |
147 | ||
60678bbc | 148 | return fd; |
1da177e4 LT |
149 | } |
150 | ||
151 | static int __init uml_mem_setup(char *line, int *add) | |
152 | { | |
153 | char *retptr; | |
154 | physmem_size = memparse(line,&retptr); | |
155 | return 0; | |
156 | } | |
157 | __uml_setup("mem=", uml_mem_setup, | |
158 | "mem=<Amount of desired ram>\n" | |
159 | " This controls how much \"physical\" memory the kernel allocates\n" | |
160 | " for the system. The size is specified as a number followed by\n" | |
161 | " one of 'k', 'K', 'm', 'M', which have the obvious meanings.\n" | |
162 | " This is not related to the amount of memory in the host. It can\n" | |
163 | " be more, and the excess, if it's ever used, will just be swapped out.\n" | |
164 | " Example: mem=64M\n\n" | |
165 | ); | |
166 | ||
94c282d7 JD |
167 | extern int __init parse_iomem(char *str, int *add); |
168 | ||
169 | __uml_setup("iomem=", parse_iomem, | |
170 | "iomem=<name>,<file>\n" | |
171 | " Configure <file> as an IO memory region named <name>.\n\n" | |
172 | ); | |
173 | ||
174 | /* | |
175 | * This list is constructed in parse_iomem and addresses filled in in | |
176 | * setup_iomem, both of which run during early boot. Afterwards, it's | |
177 | * unchanged. | |
178 | */ | |
80e39311 | 179 | struct iomem_region *iomem_regions; |
94c282d7 | 180 | |
80e39311 JD |
181 | /* Initialized in parse_iomem and unchanged thereafter */ |
182 | int iomem_size; | |
94c282d7 | 183 | |
1da177e4 LT |
184 | unsigned long find_iomem(char *driver, unsigned long *len_out) |
185 | { | |
186 | struct iomem_region *region = iomem_regions; | |
187 | ||
6d536e4b JD |
188 | while (region != NULL) { |
189 | if (!strcmp(region->driver, driver)) { | |
1da177e4 | 190 | *len_out = region->size; |
60678bbc | 191 | return region->virt; |
1da177e4 | 192 | } |
c39e50b4 VV |
193 | |
194 | region = region->next; | |
1da177e4 LT |
195 | } |
196 | ||
60678bbc | 197 | return 0; |
1da177e4 | 198 | } |
73395a00 | 199 | EXPORT_SYMBOL(find_iomem); |
1da177e4 | 200 | |
99764fa4 | 201 | static int setup_iomem(void) |
1da177e4 LT |
202 | { |
203 | struct iomem_region *region = iomem_regions; | |
204 | unsigned long iomem_start = high_physmem + PAGE_SIZE; | |
205 | int err; | |
206 | ||
6d536e4b | 207 | while (region != NULL) { |
1da177e4 LT |
208 | err = os_map_memory((void *) iomem_start, region->fd, 0, |
209 | region->size, 1, 1, 0); | |
6d536e4b | 210 | if (err) |
ba180fd4 JD |
211 | printk(KERN_ERR "Mapping iomem region for driver '%s' " |
212 | "failed, errno = %d\n", region->driver, -err); | |
1da177e4 LT |
213 | else { |
214 | region->virt = iomem_start; | |
215 | region->phys = __pa(region->virt); | |
216 | } | |
217 | ||
218 | iomem_start += region->size + PAGE_SIZE; | |
219 | region = region->next; | |
220 | } | |
221 | ||
60678bbc | 222 | return 0; |
1da177e4 LT |
223 | } |
224 | ||
225 | __initcall(setup_iomem); |