Commit | Line | Data |
---|---|---|
ea2ba7dc | 1 | /* |
ba180fd4 | 2 | * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
c5d4bb17 JD |
6 | #include <linux/delay.h> |
7 | #include <linux/init.h> | |
8 | #include <linux/mm.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/seq_file.h> | |
11 | #include <linux/string.h> | |
12 | #include <linux/utsname.h> | |
13 | #include <asm/pgtable.h> | |
14 | #include <asm/processor.h> | |
15 | #include <asm/setup.h> | |
ba180fd4 | 16 | #include "as-layout.h" |
c5d4bb17 | 17 | #include "arch.h" |
ba180fd4 | 18 | #include "init.h" |
1da177e4 | 19 | #include "kern.h" |
edea1385 | 20 | #include "kern_util.h" |
1da177e4 | 21 | #include "mem_user.h" |
1da177e4 | 22 | #include "os.h" |
1da177e4 LT |
23 | |
24 | #define DEFAULT_COMMAND_LINE "root=98:0" | |
25 | ||
1d1497e1 | 26 | /* Changed in add_arg and setup_arch, which run before SMP is started */ |
7a3a06d0 | 27 | static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 }; |
1da177e4 | 28 | |
7a3a06d0 | 29 | static void __init add_arg(char *arg) |
1da177e4 LT |
30 | { |
31 | if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) { | |
32 | printf("add_arg: Too many command line arguments!\n"); | |
33 | exit(1); | |
34 | } | |
ba180fd4 | 35 | if (strlen(command_line) > 0) |
1da177e4 LT |
36 | strcat(command_line, " "); |
37 | strcat(command_line, arg); | |
38 | } | |
39 | ||
1d1497e1 JD |
40 | /* |
41 | * These fields are initialized at boot time and not changed. | |
42 | * XXX This structure is used only in the non-SMP case. Maybe this | |
43 | * should be moved to smp.c. | |
44 | */ | |
45 | struct cpuinfo_um boot_cpu_data = { | |
1da177e4 LT |
46 | .loops_per_jiffy = 0, |
47 | .ipi_pipe = { -1, -1 } | |
48 | }; | |
49 | ||
50 | unsigned long thread_saved_pc(struct task_struct *task) | |
51 | { | |
77bf4400 JD |
52 | /* FIXME: Need to look up userspace_pid by cpu */ |
53 | return os_process_pc(userspace_pid[0]); | |
1da177e4 LT |
54 | } |
55 | ||
b4ffb6ad JD |
56 | /* Changed in setup_arch, which is called in early boot */ |
57 | static char host_info[(__NEW_UTS_LEN + 1) * 5]; | |
58 | ||
1da177e4 LT |
59 | static int show_cpuinfo(struct seq_file *m, void *v) |
60 | { | |
61 | int index = 0; | |
62 | ||
63 | #ifdef CONFIG_SMP | |
64 | index = (struct cpuinfo_um *) v - cpu_data; | |
65 | if (!cpu_online(index)) | |
66 | return 0; | |
67 | #endif | |
68 | ||
69 | seq_printf(m, "processor\t: %d\n", index); | |
70 | seq_printf(m, "vendor_id\t: User Mode Linux\n"); | |
71 | seq_printf(m, "model name\t: UML\n"); | |
6aa802ce | 72 | seq_printf(m, "mode\t\t: skas\n"); |
1da177e4 LT |
73 | seq_printf(m, "host\t\t: %s\n", host_info); |
74 | seq_printf(m, "bogomips\t: %lu.%02lu\n\n", | |
75 | loops_per_jiffy/(500000/HZ), | |
76 | (loops_per_jiffy/(5000/HZ)) % 100); | |
77 | ||
a5ed1ffa | 78 | return 0; |
1da177e4 LT |
79 | } |
80 | ||
81 | static void *c_start(struct seq_file *m, loff_t *pos) | |
82 | { | |
83 | return *pos < NR_CPUS ? cpu_data + *pos : NULL; | |
84 | } | |
85 | ||
86 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) | |
87 | { | |
88 | ++*pos; | |
89 | return c_start(m, pos); | |
90 | } | |
91 | ||
92 | static void c_stop(struct seq_file *m, void *v) | |
93 | { | |
94 | } | |
95 | ||
5e7672ec | 96 | const struct seq_operations cpuinfo_op = { |
1da177e4 LT |
97 | .start = c_start, |
98 | .next = c_next, | |
99 | .stop = c_stop, | |
100 | .show = show_cpuinfo, | |
101 | }; | |
102 | ||
1da177e4 | 103 | /* Set in linux_main */ |
1da177e4 | 104 | unsigned long uml_physmem; |
1d1497e1 | 105 | unsigned long uml_reserved; /* Also modified in mem_init */ |
1da177e4 LT |
106 | unsigned long start_vm; |
107 | unsigned long end_vm; | |
1d1497e1 JD |
108 | |
109 | /* Set in uml_ncpus_setup */ | |
1da177e4 LT |
110 | int ncpus = 1; |
111 | ||
1da177e4 LT |
112 | /* Set in early boot */ |
113 | static int have_root __initdata = 0; | |
1d1497e1 JD |
114 | |
115 | /* Set in uml_mem_setup and modified in linux_main */ | |
ae173816 | 116 | long long physmem_size = 32 * 1024 * 1024; |
1da177e4 | 117 | |
3af9c5be | 118 | static const char *usage_string = |
1da177e4 LT |
119 | "User Mode Linux v%s\n" |
120 | " available at http://user-mode-linux.sourceforge.net/\n\n"; | |
121 | ||
122 | static int __init uml_version_setup(char *line, int *add) | |
123 | { | |
96b644bd | 124 | printf("%s\n", init_utsname()->release); |
1da177e4 LT |
125 | exit(0); |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | __uml_setup("--version", uml_version_setup, | |
131 | "--version\n" | |
132 | " Prints the version number of the kernel.\n\n" | |
133 | ); | |
134 | ||
135 | static int __init uml_root_setup(char *line, int *add) | |
136 | { | |
137 | have_root = 1; | |
138 | return 0; | |
139 | } | |
140 | ||
141 | __uml_setup("root=", uml_root_setup, | |
142 | "root=<file containing the root fs>\n" | |
143 | " This is actually used by the generic kernel in exactly the same\n" | |
144 | " way as in any other kernel. If you configure a number of block\n" | |
145 | " devices and want to boot off something other than ubd0, you \n" | |
146 | " would use something like:\n" | |
147 | " root=/dev/ubd5\n\n" | |
148 | ); | |
149 | ||
fbd55779 JD |
150 | static int __init no_skas_debug_setup(char *line, int *add) |
151 | { | |
152 | printf("'debug' is not necessary to gdb UML in skas mode - run \n"); | |
96cee304 | 153 | printf("'gdb linux'\n"); |
fbd55779 JD |
154 | |
155 | return 0; | |
156 | } | |
157 | ||
158 | __uml_setup("debug", no_skas_debug_setup, | |
159 | "debug\n" | |
160 | " this flag is not needed to run gdb on UML in skas mode\n\n" | |
161 | ); | |
162 | ||
1da177e4 LT |
163 | #ifdef CONFIG_SMP |
164 | static int __init uml_ncpus_setup(char *line, int *add) | |
165 | { | |
a5ed1ffa JD |
166 | if (!sscanf(line, "%d", &ncpus)) { |
167 | printf("Couldn't parse [%s]\n", line); | |
168 | return -1; | |
169 | } | |
1da177e4 | 170 | |
a5ed1ffa | 171 | return 0; |
1da177e4 LT |
172 | } |
173 | ||
174 | __uml_setup("ncpus=", uml_ncpus_setup, | |
175 | "ncpus=<# of desired CPUs>\n" | |
ba180fd4 | 176 | " This tells an SMP kernel how many virtual processors to start.\n\n" |
1da177e4 LT |
177 | ); |
178 | #endif | |
179 | ||
1da177e4 LT |
180 | static int __init Usage(char *line, int *add) |
181 | { | |
a5ed1ffa | 182 | const char **p; |
1da177e4 | 183 | |
96b644bd | 184 | printf(usage_string, init_utsname()->release); |
a5ed1ffa JD |
185 | p = &__uml_help_start; |
186 | while (p < &__uml_help_end) { | |
187 | printf("%s", *p); | |
188 | p++; | |
189 | } | |
1da177e4 | 190 | exit(0); |
1da177e4 LT |
191 | return 0; |
192 | } | |
193 | ||
194 | __uml_setup("--help", Usage, | |
195 | "--help\n" | |
196 | " Prints this message.\n\n" | |
197 | ); | |
198 | ||
6b7e9674 | 199 | static void __init uml_checksetup(char *line, int *add) |
1da177e4 LT |
200 | { |
201 | struct uml_param *p; | |
202 | ||
203 | p = &__uml_setup_start; | |
c5d4bb17 | 204 | while (p < &__uml_setup_end) { |
3af9c5be | 205 | size_t n; |
1da177e4 LT |
206 | |
207 | n = strlen(p->str); | |
ba180fd4 | 208 | if (!strncmp(line, p->str, n) && p->setup_func(line + n, add)) |
6b7e9674 | 209 | return; |
1da177e4 LT |
210 | p++; |
211 | } | |
1da177e4 LT |
212 | } |
213 | ||
214 | static void __init uml_postsetup(void) | |
215 | { | |
216 | initcall_t *p; | |
217 | ||
218 | p = &__uml_postsetup_start; | |
c5d4bb17 | 219 | while (p < &__uml_postsetup_end) { |
1da177e4 LT |
220 | (*p)(); |
221 | p++; | |
222 | } | |
223 | return; | |
224 | } | |
225 | ||
0983a88b JD |
226 | static int panic_exit(struct notifier_block *self, unsigned long unused1, |
227 | void *unused2) | |
228 | { | |
229 | bust_spinlocks(1); | |
230 | show_regs(&(current->thread.regs)); | |
231 | bust_spinlocks(0); | |
232 | uml_exitcode = 1; | |
233 | os_dump_core(); | |
234 | return 0; | |
235 | } | |
236 | ||
237 | static struct notifier_block panic_exit_notifier = { | |
238 | .notifier_call = panic_exit, | |
239 | .next = NULL, | |
240 | .priority = 0 | |
241 | }; | |
242 | ||
1da177e4 | 243 | /* Set during early boot */ |
536788fe JD |
244 | unsigned long task_size; |
245 | EXPORT_SYMBOL(task_size); | |
246 | ||
247 | unsigned long host_task_size; | |
248 | ||
1da177e4 LT |
249 | unsigned long brk_start; |
250 | unsigned long end_iomem; | |
251 | EXPORT_SYMBOL(end_iomem); | |
252 | ||
253 | #define MIN_VMALLOC (32 * 1024 * 1024) | |
254 | ||
23bbd586 JD |
255 | extern char __binary_start; |
256 | ||
7a3a06d0 | 257 | int __init linux_main(int argc, char **argv) |
1da177e4 LT |
258 | { |
259 | unsigned long avail, diff; | |
260 | unsigned long virtmem_size, max_physmem; | |
60a2988a | 261 | unsigned long stack; |
3af9c5be WC |
262 | unsigned int i; |
263 | int add; | |
cb66504d | 264 | char * mode; |
1da177e4 | 265 | |
ba180fd4 JD |
266 | for (i = 1; i < argc; i++) { |
267 | if ((i == 1) && (argv[i][0] == ' ')) | |
268 | continue; | |
1da177e4 LT |
269 | add = 1; |
270 | uml_checksetup(argv[i], &add); | |
271 | if (add) | |
272 | add_arg(argv[i]); | |
273 | } | |
ba180fd4 | 274 | if (have_root == 0) |
1da177e4 LT |
275 | add_arg(DEFAULT_COMMAND_LINE); |
276 | ||
40fb16a3 | 277 | host_task_size = os_get_top_address(); |
536788fe JD |
278 | /* |
279 | * TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps | |
280 | * out | |
281 | */ | |
282 | task_size = host_task_size & PGDIR_MASK; | |
283 | ||
ba180fd4 | 284 | /* OS sanity checks that need to happen before the kernel runs */ |
60d339f6 | 285 | os_early_checks(); |
cb66504d | 286 | |
42fda663 JD |
287 | can_do_skas(); |
288 | ||
289 | if (proc_mm && ptrace_faultinfo) | |
cb66504d PBG |
290 | mode = "SKAS3"; |
291 | else | |
292 | mode = "SKAS0"; | |
cb66504d PBG |
293 | |
294 | printf("UML running in %s mode\n", mode); | |
295 | ||
1da177e4 | 296 | brk_start = (unsigned long) sbrk(0); |
77bf4400 | 297 | |
ba180fd4 JD |
298 | /* |
299 | * Increase physical memory size for exec-shield users | |
300 | * so they actually get what they asked for. This should | |
301 | * add zero for non-exec shield users | |
302 | */ | |
1da177e4 LT |
303 | |
304 | diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); | |
ba180fd4 | 305 | if (diff > 1024 * 1024) { |
1da177e4 LT |
306 | printf("Adding %ld bytes to physical memory to account for " |
307 | "exec-shield gap\n", diff); | |
308 | physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); | |
309 | } | |
310 | ||
1d1497e1 | 311 | uml_physmem = (unsigned long) &__binary_start & PAGE_MASK; |
1da177e4 LT |
312 | |
313 | /* Reserve up to 4M after the current brk */ | |
314 | uml_reserved = ROUND_4M(brk_start) + (1 << 22); | |
315 | ||
96b644bd | 316 | setup_machinename(init_utsname()->machine); |
1da177e4 | 317 | |
1da177e4 LT |
318 | highmem = 0; |
319 | iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK; | |
536788fe | 320 | max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC; |
1da177e4 | 321 | |
ba180fd4 JD |
322 | /* |
323 | * Zones have to begin on a 1 << MAX_ORDER page boundary, | |
1da177e4 LT |
324 | * so this makes sure that's true for highmem |
325 | */ | |
326 | max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1); | |
ba180fd4 | 327 | if (physmem_size + iomem_size > max_physmem) { |
1da177e4 LT |
328 | highmem = physmem_size + iomem_size - max_physmem; |
329 | physmem_size -= highmem; | |
330 | #ifndef CONFIG_HIGHMEM | |
331 | highmem = 0; | |
332 | printf("CONFIG_HIGHMEM not enabled - physical memory shrunk " | |
d9f8b62a | 333 | "to %Lu bytes\n", physmem_size); |
1da177e4 LT |
334 | #endif |
335 | } | |
336 | ||
337 | high_physmem = uml_physmem + physmem_size; | |
338 | end_iomem = high_physmem + iomem_size; | |
339 | high_memory = (void *) end_iomem; | |
340 | ||
341 | start_vm = VMALLOC_START; | |
342 | ||
343 | setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem); | |
ba180fd4 | 344 | if (init_maps(physmem_size, iomem_size, highmem)) { |
d9f8b62a JD |
345 | printf("Failed to allocate mem_map for %Lu bytes of physical " |
346 | "memory and %Lu bytes of highmem\n", physmem_size, | |
1da177e4 LT |
347 | highmem); |
348 | exit(1); | |
349 | } | |
350 | ||
351 | virtmem_size = physmem_size; | |
60a2988a JD |
352 | stack = (unsigned long) argv; |
353 | stack &= ~(1024 * 1024 - 1); | |
354 | avail = stack - start_vm; | |
ba180fd4 JD |
355 | if (physmem_size > avail) |
356 | virtmem_size = avail; | |
1da177e4 LT |
357 | end_vm = start_vm + virtmem_size; |
358 | ||
ba180fd4 | 359 | if (virtmem_size < physmem_size) |
ae173816 | 360 | printf("Kernel virtual memory size shrunk to %lu bytes\n", |
1da177e4 LT |
361 | virtmem_size); |
362 | ||
0983a88b JD |
363 | atomic_notifier_chain_register(&panic_notifier_list, |
364 | &panic_exit_notifier); | |
365 | ||
a5ed1ffa | 366 | uml_postsetup(); |
1da177e4 | 367 | |
57598fd7 | 368 | stack_protections((unsigned long) &init_thread_info); |
1da177e4 LT |
369 | os_flush_stdout(); |
370 | ||
77bf4400 | 371 | return start_uml(); |
1da177e4 LT |
372 | } |
373 | ||
1da177e4 LT |
374 | void __init setup_arch(char **cmdline_p) |
375 | { | |
1da177e4 | 376 | paging_init(); |
19bf7e7a | 377 | strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); |
a5ed1ffa | 378 | *cmdline_p = command_line; |
b4ffb6ad | 379 | setup_hostinfo(host_info, sizeof host_info); |
1da177e4 LT |
380 | } |
381 | ||
382 | void __init check_bugs(void) | |
383 | { | |
384 | arch_check_bugs(); | |
a5ed1ffa | 385 | os_check_bugs(); |
1da177e4 LT |
386 | } |
387 | ||
9a0b5817 GH |
388 | void apply_alternatives(struct alt_instr *start, struct alt_instr *end) |
389 | { | |
390 | } | |
391 | ||
c61a8416 | 392 | #ifdef CONFIG_SMP |
9a0b5817 GH |
393 | void alternatives_smp_module_add(struct module *mod, char *name, |
394 | void *locks, void *locks_end, | |
395 | void *text, void *text_end) | |
396 | { | |
397 | } | |
398 | ||
399 | void alternatives_smp_module_del(struct module *mod) | |
1da177e4 LT |
400 | { |
401 | } | |
c61a8416 | 402 | #endif |