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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com) | |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #include "linux/config.h" | |
7 | #include "linux/kernel.h" | |
8 | #include "linux/sched.h" | |
9 | #include "linux/notifier.h" | |
10 | #include "linux/mm.h" | |
11 | #include "linux/types.h" | |
12 | #include "linux/tty.h" | |
13 | #include "linux/init.h" | |
14 | #include "linux/bootmem.h" | |
15 | #include "linux/spinlock.h" | |
16 | #include "linux/utsname.h" | |
17 | #include "linux/sysrq.h" | |
18 | #include "linux/seq_file.h" | |
19 | #include "linux/delay.h" | |
20 | #include "linux/module.h" | |
21 | #include "asm/page.h" | |
22 | #include "asm/pgtable.h" | |
23 | #include "asm/ptrace.h" | |
24 | #include "asm/elf.h" | |
25 | #include "asm/user.h" | |
16c11163 | 26 | #include "asm/setup.h" |
1da177e4 LT |
27 | #include "ubd_user.h" |
28 | #include "asm/current.h" | |
1da177e4 LT |
29 | #include "user_util.h" |
30 | #include "kern_util.h" | |
31 | #include "kern.h" | |
32 | #include "mem_user.h" | |
33 | #include "mem.h" | |
34 | #include "umid.h" | |
35 | #include "initrd.h" | |
36 | #include "init.h" | |
37 | #include "os.h" | |
38 | #include "choose-mode.h" | |
39 | #include "mode_kern.h" | |
40 | #include "mode.h" | |
cb66504d PBG |
41 | #ifdef UML_CONFIG_MODE_SKAS |
42 | #include "skas.h" | |
43 | #endif | |
1da177e4 LT |
44 | |
45 | #define DEFAULT_COMMAND_LINE "root=98:0" | |
46 | ||
47 | /* Changed in linux_main and setup_arch, which run before SMP is started */ | |
16c11163 | 48 | static char command_line[COMMAND_LINE_SIZE] = { 0 }; |
1da177e4 | 49 | |
16c11163 | 50 | static void add_arg(char *arg) |
1da177e4 LT |
51 | { |
52 | if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) { | |
53 | printf("add_arg: Too many command line arguments!\n"); | |
54 | exit(1); | |
55 | } | |
56 | if(strlen(command_line) > 0) | |
57 | strcat(command_line, " "); | |
58 | strcat(command_line, arg); | |
59 | } | |
60 | ||
61 | struct cpuinfo_um boot_cpu_data = { | |
62 | .loops_per_jiffy = 0, | |
63 | .ipi_pipe = { -1, -1 } | |
64 | }; | |
65 | ||
66 | unsigned long thread_saved_pc(struct task_struct *task) | |
67 | { | |
68 | return(os_process_pc(CHOOSE_MODE_PROC(thread_pid_tt, thread_pid_skas, | |
69 | task))); | |
70 | } | |
71 | ||
72 | static int show_cpuinfo(struct seq_file *m, void *v) | |
73 | { | |
74 | int index = 0; | |
75 | ||
76 | #ifdef CONFIG_SMP | |
77 | index = (struct cpuinfo_um *) v - cpu_data; | |
78 | if (!cpu_online(index)) | |
79 | return 0; | |
80 | #endif | |
81 | ||
82 | seq_printf(m, "processor\t: %d\n", index); | |
83 | seq_printf(m, "vendor_id\t: User Mode Linux\n"); | |
84 | seq_printf(m, "model name\t: UML\n"); | |
85 | seq_printf(m, "mode\t\t: %s\n", CHOOSE_MODE("tt", "skas")); | |
86 | seq_printf(m, "host\t\t: %s\n", host_info); | |
87 | seq_printf(m, "bogomips\t: %lu.%02lu\n\n", | |
88 | loops_per_jiffy/(500000/HZ), | |
89 | (loops_per_jiffy/(5000/HZ)) % 100); | |
90 | ||
91 | return(0); | |
92 | } | |
93 | ||
94 | static void *c_start(struct seq_file *m, loff_t *pos) | |
95 | { | |
96 | return *pos < NR_CPUS ? cpu_data + *pos : NULL; | |
97 | } | |
98 | ||
99 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) | |
100 | { | |
101 | ++*pos; | |
102 | return c_start(m, pos); | |
103 | } | |
104 | ||
105 | static void c_stop(struct seq_file *m, void *v) | |
106 | { | |
107 | } | |
108 | ||
109 | struct seq_operations cpuinfo_op = { | |
110 | .start = c_start, | |
111 | .next = c_next, | |
112 | .stop = c_stop, | |
113 | .show = show_cpuinfo, | |
114 | }; | |
115 | ||
1da177e4 LT |
116 | /* Set in linux_main */ |
117 | unsigned long host_task_size; | |
118 | unsigned long task_size; | |
119 | ||
120 | unsigned long uml_start; | |
121 | ||
122 | /* Set in early boot */ | |
123 | unsigned long uml_physmem; | |
124 | unsigned long uml_reserved; | |
125 | unsigned long start_vm; | |
126 | unsigned long end_vm; | |
127 | int ncpus = 1; | |
128 | ||
02215759 | 129 | #ifdef CONFIG_CMDLINE_ON_HOST |
1da177e4 LT |
130 | /* Pointer set in linux_main, the array itself is private to each thread, |
131 | * and changed at address space creation time so this poses no concurrency | |
132 | * problems. | |
133 | */ | |
134 | static char *argv1_begin = NULL; | |
135 | static char *argv1_end = NULL; | |
136 | #endif | |
137 | ||
138 | /* Set in early boot */ | |
139 | static int have_root __initdata = 0; | |
ae173816 | 140 | long long physmem_size = 32 * 1024 * 1024; |
1da177e4 LT |
141 | |
142 | void set_cmdline(char *cmd) | |
143 | { | |
02215759 | 144 | #ifdef CONFIG_CMDLINE_ON_HOST |
1da177e4 LT |
145 | char *umid, *ptr; |
146 | ||
147 | if(CHOOSE_MODE(honeypot, 0)) return; | |
148 | ||
7eebe8a9 JD |
149 | umid = get_umid(); |
150 | if(*umid != '\0'){ | |
1da177e4 LT |
151 | snprintf(argv1_begin, |
152 | (argv1_end - argv1_begin) * sizeof(*ptr), | |
153 | "(%s) ", umid); | |
154 | ptr = &argv1_begin[strlen(argv1_begin)]; | |
155 | } | |
156 | else ptr = argv1_begin; | |
157 | ||
158 | snprintf(ptr, (argv1_end - ptr) * sizeof(*ptr), "[%s]", cmd); | |
159 | memset(argv1_begin + strlen(argv1_begin), '\0', | |
160 | argv1_end - argv1_begin - strlen(argv1_begin)); | |
161 | #endif | |
162 | } | |
163 | ||
164 | static char *usage_string = | |
165 | "User Mode Linux v%s\n" | |
166 | " available at http://user-mode-linux.sourceforge.net/\n\n"; | |
167 | ||
168 | static int __init uml_version_setup(char *line, int *add) | |
169 | { | |
170 | printf("%s\n", system_utsname.release); | |
171 | exit(0); | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | __uml_setup("--version", uml_version_setup, | |
177 | "--version\n" | |
178 | " Prints the version number of the kernel.\n\n" | |
179 | ); | |
180 | ||
181 | static int __init uml_root_setup(char *line, int *add) | |
182 | { | |
183 | have_root = 1; | |
184 | return 0; | |
185 | } | |
186 | ||
187 | __uml_setup("root=", uml_root_setup, | |
188 | "root=<file containing the root fs>\n" | |
189 | " This is actually used by the generic kernel in exactly the same\n" | |
190 | " way as in any other kernel. If you configure a number of block\n" | |
191 | " devices and want to boot off something other than ubd0, you \n" | |
192 | " would use something like:\n" | |
193 | " root=/dev/ubd5\n\n" | |
194 | ); | |
195 | ||
196 | #ifdef CONFIG_SMP | |
197 | static int __init uml_ncpus_setup(char *line, int *add) | |
198 | { | |
199 | if (!sscanf(line, "%d", &ncpus)) { | |
200 | printf("Couldn't parse [%s]\n", line); | |
201 | return -1; | |
202 | } | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | __uml_setup("ncpus=", uml_ncpus_setup, | |
208 | "ncpus=<# of desired CPUs>\n" | |
209 | " This tells an SMP kernel how many virtual processors to start.\n\n" | |
210 | ); | |
211 | #endif | |
212 | ||
213 | static int force_tt = 0; | |
214 | ||
215 | #if defined(CONFIG_MODE_TT) && defined(CONFIG_MODE_SKAS) | |
216 | #define DEFAULT_TT 0 | |
217 | ||
218 | static int __init mode_tt_setup(char *line, int *add) | |
219 | { | |
220 | force_tt = 1; | |
221 | return(0); | |
222 | } | |
223 | ||
224 | #else | |
225 | #ifdef CONFIG_MODE_SKAS | |
226 | ||
227 | #define DEFAULT_TT 0 | |
228 | ||
229 | static int __init mode_tt_setup(char *line, int *add) | |
230 | { | |
231 | printf("CONFIG_MODE_TT disabled - 'mode=tt' ignored\n"); | |
232 | return(0); | |
233 | } | |
234 | ||
235 | #else | |
236 | #ifdef CONFIG_MODE_TT | |
237 | ||
238 | #define DEFAULT_TT 1 | |
239 | ||
240 | static int __init mode_tt_setup(char *line, int *add) | |
241 | { | |
242 | printf("CONFIG_MODE_SKAS disabled - 'mode=tt' redundant\n"); | |
243 | return(0); | |
244 | } | |
245 | ||
246 | #else | |
247 | ||
248 | #error Either CONFIG_MODE_TT or CONFIG_MODE_SKAS must be enabled | |
249 | ||
250 | #endif | |
251 | #endif | |
252 | #endif | |
253 | ||
254 | __uml_setup("mode=tt", mode_tt_setup, | |
255 | "mode=tt\n" | |
256 | " When both CONFIG_MODE_TT and CONFIG_MODE_SKAS are enabled, this option\n" | |
257 | " forces UML to run in tt (tracing thread) mode. It is not the default\n" | |
258 | " because it's slower and less secure than skas mode.\n\n" | |
259 | ); | |
260 | ||
261 | int mode_tt = DEFAULT_TT; | |
262 | ||
263 | static int __init Usage(char *line, int *add) | |
264 | { | |
265 | const char **p; | |
266 | ||
267 | printf(usage_string, system_utsname.release); | |
268 | p = &__uml_help_start; | |
269 | while (p < &__uml_help_end) { | |
270 | printf("%s", *p); | |
271 | p++; | |
272 | } | |
273 | exit(0); | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | __uml_setup("--help", Usage, | |
279 | "--help\n" | |
280 | " Prints this message.\n\n" | |
281 | ); | |
282 | ||
283 | static int __init uml_checksetup(char *line, int *add) | |
284 | { | |
285 | struct uml_param *p; | |
286 | ||
287 | p = &__uml_setup_start; | |
288 | while(p < &__uml_setup_end) { | |
289 | int n; | |
290 | ||
291 | n = strlen(p->str); | |
292 | if(!strncmp(line, p->str, n)){ | |
293 | if (p->setup_func(line + n, add)) return 1; | |
294 | } | |
295 | p++; | |
296 | } | |
297 | return 0; | |
298 | } | |
299 | ||
300 | static void __init uml_postsetup(void) | |
301 | { | |
302 | initcall_t *p; | |
303 | ||
304 | p = &__uml_postsetup_start; | |
305 | while(p < &__uml_postsetup_end){ | |
306 | (*p)(); | |
307 | p++; | |
308 | } | |
309 | return; | |
310 | } | |
311 | ||
312 | /* Set during early boot */ | |
313 | unsigned long brk_start; | |
314 | unsigned long end_iomem; | |
315 | EXPORT_SYMBOL(end_iomem); | |
316 | ||
317 | #define MIN_VMALLOC (32 * 1024 * 1024) | |
318 | ||
319 | int linux_main(int argc, char **argv) | |
320 | { | |
321 | unsigned long avail, diff; | |
322 | unsigned long virtmem_size, max_physmem; | |
323 | unsigned int i, add; | |
cb66504d | 324 | char * mode; |
1da177e4 LT |
325 | |
326 | for (i = 1; i < argc; i++){ | |
327 | if((i == 1) && (argv[i][0] == ' ')) continue; | |
328 | add = 1; | |
329 | uml_checksetup(argv[i], &add); | |
330 | if (add) | |
331 | add_arg(argv[i]); | |
332 | } | |
333 | if(have_root == 0) | |
334 | add_arg(DEFAULT_COMMAND_LINE); | |
335 | ||
60d339f6 | 336 | os_early_checks(); |
8923648c PBG |
337 | if (force_tt) |
338 | clear_can_do_skas(); | |
1da177e4 LT |
339 | mode_tt = force_tt ? 1 : !can_do_skas(); |
340 | #ifndef CONFIG_MODE_TT | |
341 | if (mode_tt) { | |
342 | /*Since CONFIG_MODE_TT is #undef'ed, force_tt cannot be 1. So, | |
343 | * can_do_skas() returned 0, and the message is correct. */ | |
344 | printf("Support for TT mode is disabled, and no SKAS support is present on the host.\n"); | |
345 | exit(1); | |
346 | } | |
347 | #endif | |
cb66504d PBG |
348 | |
349 | #ifndef CONFIG_MODE_SKAS | |
350 | mode = "TT"; | |
351 | #else | |
352 | /* Show to the user the result of selection */ | |
353 | if (mode_tt) | |
354 | mode = "TT"; | |
355 | else if (proc_mm && ptrace_faultinfo) | |
356 | mode = "SKAS3"; | |
357 | else | |
358 | mode = "SKAS0"; | |
359 | #endif | |
360 | ||
361 | printf("UML running in %s mode\n", mode); | |
362 | ||
1da177e4 LT |
363 | uml_start = CHOOSE_MODE_PROC(set_task_sizes_tt, set_task_sizes_skas, 0, |
364 | &host_task_size, &task_size); | |
365 | ||
1da177e4 LT |
366 | brk_start = (unsigned long) sbrk(0); |
367 | CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start); | |
368 | /* Increase physical memory size for exec-shield users | |
369 | so they actually get what they asked for. This should | |
370 | add zero for non-exec shield users */ | |
371 | ||
372 | diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); | |
373 | if(diff > 1024 * 1024){ | |
374 | printf("Adding %ld bytes to physical memory to account for " | |
375 | "exec-shield gap\n", diff); | |
376 | physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); | |
377 | } | |
378 | ||
379 | uml_physmem = uml_start; | |
380 | ||
381 | /* Reserve up to 4M after the current brk */ | |
382 | uml_reserved = ROUND_4M(brk_start) + (1 << 22); | |
383 | ||
384 | setup_machinename(system_utsname.machine); | |
385 | ||
02215759 | 386 | #ifdef CONFIG_CMDLINE_ON_HOST |
1da177e4 LT |
387 | argv1_begin = argv[1]; |
388 | argv1_end = &argv[1][strlen(argv[1])]; | |
389 | #endif | |
390 | ||
391 | highmem = 0; | |
392 | iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK; | |
393 | max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC; | |
394 | ||
395 | /* Zones have to begin on a 1 << MAX_ORDER page boundary, | |
396 | * so this makes sure that's true for highmem | |
397 | */ | |
398 | max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1); | |
399 | if(physmem_size + iomem_size > max_physmem){ | |
400 | highmem = physmem_size + iomem_size - max_physmem; | |
401 | physmem_size -= highmem; | |
402 | #ifndef CONFIG_HIGHMEM | |
403 | highmem = 0; | |
404 | printf("CONFIG_HIGHMEM not enabled - physical memory shrunk " | |
ae173816 | 405 | "to %lu bytes\n", physmem_size); |
1da177e4 LT |
406 | #endif |
407 | } | |
408 | ||
409 | high_physmem = uml_physmem + physmem_size; | |
410 | end_iomem = high_physmem + iomem_size; | |
411 | high_memory = (void *) end_iomem; | |
412 | ||
413 | start_vm = VMALLOC_START; | |
414 | ||
415 | setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem); | |
416 | if(init_maps(physmem_size, iomem_size, highmem)){ | |
ae173816 JD |
417 | printf("Failed to allocate mem_map for %lu bytes of physical " |
418 | "memory and %lu bytes of highmem\n", physmem_size, | |
1da177e4 LT |
419 | highmem); |
420 | exit(1); | |
421 | } | |
422 | ||
423 | virtmem_size = physmem_size; | |
424 | avail = get_kmem_end() - start_vm; | |
425 | if(physmem_size > avail) virtmem_size = avail; | |
426 | end_vm = start_vm + virtmem_size; | |
427 | ||
428 | if(virtmem_size < physmem_size) | |
ae173816 | 429 | printf("Kernel virtual memory size shrunk to %lu bytes\n", |
1da177e4 LT |
430 | virtmem_size); |
431 | ||
432 | uml_postsetup(); | |
433 | ||
434 | task_protections((unsigned long) &init_thread_info); | |
435 | os_flush_stdout(); | |
436 | ||
437 | return(CHOOSE_MODE(start_uml_tt(), start_uml_skas())); | |
438 | } | |
439 | ||
440 | extern int uml_exitcode; | |
441 | ||
442 | static int panic_exit(struct notifier_block *self, unsigned long unused1, | |
443 | void *unused2) | |
444 | { | |
445 | bust_spinlocks(1); | |
446 | show_regs(&(current->thread.regs)); | |
447 | bust_spinlocks(0); | |
448 | uml_exitcode = 1; | |
449 | machine_halt(); | |
450 | return(0); | |
451 | } | |
452 | ||
453 | static struct notifier_block panic_exit_notifier = { | |
454 | .notifier_call = panic_exit, | |
455 | .next = NULL, | |
456 | .priority = 0 | |
457 | }; | |
458 | ||
459 | void __init setup_arch(char **cmdline_p) | |
460 | { | |
461 | notifier_chain_register(&panic_notifier_list, &panic_exit_notifier); | |
462 | paging_init(); | |
16c11163 | 463 | strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE); |
1da177e4 LT |
464 | *cmdline_p = command_line; |
465 | setup_hostinfo(); | |
466 | } | |
467 | ||
468 | void __init check_bugs(void) | |
469 | { | |
470 | arch_check_bugs(); | |
1da177e4 LT |
471 | check_sigio(); |
472 | check_devanon(); | |
473 | } | |
474 | ||
475 | void apply_alternatives(void *start, void *end) | |
476 | { | |
477 | } |