Commit | Line | Data |
---|---|---|
ea2ba7dc | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com) |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
1da177e4 LT |
6 | #include "linux/kernel.h" |
7 | #include "linux/sched.h" | |
8 | #include "linux/notifier.h" | |
9 | #include "linux/mm.h" | |
10 | #include "linux/types.h" | |
11 | #include "linux/tty.h" | |
12 | #include "linux/init.h" | |
13 | #include "linux/bootmem.h" | |
14 | #include "linux/spinlock.h" | |
15 | #include "linux/utsname.h" | |
16 | #include "linux/sysrq.h" | |
17 | #include "linux/seq_file.h" | |
18 | #include "linux/delay.h" | |
19 | #include "linux/module.h" | |
20 | #include "asm/page.h" | |
21 | #include "asm/pgtable.h" | |
22 | #include "asm/ptrace.h" | |
23 | #include "asm/elf.h" | |
24 | #include "asm/user.h" | |
16c11163 | 25 | #include "asm/setup.h" |
1da177e4 LT |
26 | #include "ubd_user.h" |
27 | #include "asm/current.h" | |
1da177e4 LT |
28 | #include "user_util.h" |
29 | #include "kern_util.h" | |
30 | #include "kern.h" | |
31 | #include "mem_user.h" | |
32 | #include "mem.h" | |
1da177e4 LT |
33 | #include "initrd.h" |
34 | #include "init.h" | |
35 | #include "os.h" | |
36 | #include "choose-mode.h" | |
37 | #include "mode_kern.h" | |
38 | #include "mode.h" | |
cb66504d PBG |
39 | #ifdef UML_CONFIG_MODE_SKAS |
40 | #include "skas.h" | |
41 | #endif | |
1da177e4 LT |
42 | |
43 | #define DEFAULT_COMMAND_LINE "root=98:0" | |
44 | ||
45 | /* Changed in linux_main and setup_arch, which run before SMP is started */ | |
16c11163 | 46 | static char command_line[COMMAND_LINE_SIZE] = { 0 }; |
1da177e4 | 47 | |
16c11163 | 48 | static void add_arg(char *arg) |
1da177e4 LT |
49 | { |
50 | if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) { | |
51 | printf("add_arg: Too many command line arguments!\n"); | |
52 | exit(1); | |
53 | } | |
54 | if(strlen(command_line) > 0) | |
55 | strcat(command_line, " "); | |
56 | strcat(command_line, arg); | |
57 | } | |
58 | ||
59 | struct cpuinfo_um boot_cpu_data = { | |
60 | .loops_per_jiffy = 0, | |
61 | .ipi_pipe = { -1, -1 } | |
62 | }; | |
63 | ||
64 | unsigned long thread_saved_pc(struct task_struct *task) | |
65 | { | |
66 | return(os_process_pc(CHOOSE_MODE_PROC(thread_pid_tt, thread_pid_skas, | |
67 | task))); | |
68 | } | |
69 | ||
70 | static int show_cpuinfo(struct seq_file *m, void *v) | |
71 | { | |
72 | int index = 0; | |
73 | ||
74 | #ifdef CONFIG_SMP | |
75 | index = (struct cpuinfo_um *) v - cpu_data; | |
76 | if (!cpu_online(index)) | |
77 | return 0; | |
78 | #endif | |
79 | ||
80 | seq_printf(m, "processor\t: %d\n", index); | |
81 | seq_printf(m, "vendor_id\t: User Mode Linux\n"); | |
82 | seq_printf(m, "model name\t: UML\n"); | |
83 | seq_printf(m, "mode\t\t: %s\n", CHOOSE_MODE("tt", "skas")); | |
84 | seq_printf(m, "host\t\t: %s\n", host_info); | |
85 | seq_printf(m, "bogomips\t: %lu.%02lu\n\n", | |
86 | loops_per_jiffy/(500000/HZ), | |
87 | (loops_per_jiffy/(5000/HZ)) % 100); | |
88 | ||
89 | return(0); | |
90 | } | |
91 | ||
92 | static void *c_start(struct seq_file *m, loff_t *pos) | |
93 | { | |
94 | return *pos < NR_CPUS ? cpu_data + *pos : NULL; | |
95 | } | |
96 | ||
97 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) | |
98 | { | |
99 | ++*pos; | |
100 | return c_start(m, pos); | |
101 | } | |
102 | ||
103 | static void c_stop(struct seq_file *m, void *v) | |
104 | { | |
105 | } | |
106 | ||
5e7672ec | 107 | const struct seq_operations cpuinfo_op = { |
1da177e4 LT |
108 | .start = c_start, |
109 | .next = c_next, | |
110 | .stop = c_stop, | |
111 | .show = show_cpuinfo, | |
112 | }; | |
113 | ||
1da177e4 LT |
114 | /* Set in linux_main */ |
115 | unsigned long host_task_size; | |
116 | unsigned long task_size; | |
117 | ||
118 | unsigned long uml_start; | |
119 | ||
120 | /* Set in early boot */ | |
121 | unsigned long uml_physmem; | |
122 | unsigned long uml_reserved; | |
123 | unsigned long start_vm; | |
124 | unsigned long end_vm; | |
125 | int ncpus = 1; | |
126 | ||
02215759 | 127 | #ifdef CONFIG_CMDLINE_ON_HOST |
1da177e4 LT |
128 | /* Pointer set in linux_main, the array itself is private to each thread, |
129 | * and changed at address space creation time so this poses no concurrency | |
130 | * problems. | |
131 | */ | |
132 | static char *argv1_begin = NULL; | |
133 | static char *argv1_end = NULL; | |
134 | #endif | |
135 | ||
136 | /* Set in early boot */ | |
137 | static int have_root __initdata = 0; | |
ae173816 | 138 | long long physmem_size = 32 * 1024 * 1024; |
1da177e4 LT |
139 | |
140 | void set_cmdline(char *cmd) | |
141 | { | |
02215759 | 142 | #ifdef CONFIG_CMDLINE_ON_HOST |
1da177e4 LT |
143 | char *umid, *ptr; |
144 | ||
145 | if(CHOOSE_MODE(honeypot, 0)) return; | |
146 | ||
7eebe8a9 JD |
147 | umid = get_umid(); |
148 | if(*umid != '\0'){ | |
1da177e4 LT |
149 | snprintf(argv1_begin, |
150 | (argv1_end - argv1_begin) * sizeof(*ptr), | |
151 | "(%s) ", umid); | |
152 | ptr = &argv1_begin[strlen(argv1_begin)]; | |
153 | } | |
154 | else ptr = argv1_begin; | |
155 | ||
156 | snprintf(ptr, (argv1_end - ptr) * sizeof(*ptr), "[%s]", cmd); | |
157 | memset(argv1_begin + strlen(argv1_begin), '\0', | |
158 | argv1_end - argv1_begin - strlen(argv1_begin)); | |
159 | #endif | |
160 | } | |
161 | ||
162 | static char *usage_string = | |
163 | "User Mode Linux v%s\n" | |
164 | " available at http://user-mode-linux.sourceforge.net/\n\n"; | |
165 | ||
166 | static int __init uml_version_setup(char *line, int *add) | |
167 | { | |
96b644bd | 168 | printf("%s\n", init_utsname()->release); |
1da177e4 LT |
169 | exit(0); |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | __uml_setup("--version", uml_version_setup, | |
175 | "--version\n" | |
176 | " Prints the version number of the kernel.\n\n" | |
177 | ); | |
178 | ||
179 | static int __init uml_root_setup(char *line, int *add) | |
180 | { | |
181 | have_root = 1; | |
182 | return 0; | |
183 | } | |
184 | ||
185 | __uml_setup("root=", uml_root_setup, | |
186 | "root=<file containing the root fs>\n" | |
187 | " This is actually used by the generic kernel in exactly the same\n" | |
188 | " way as in any other kernel. If you configure a number of block\n" | |
189 | " devices and want to boot off something other than ubd0, you \n" | |
190 | " would use something like:\n" | |
191 | " root=/dev/ubd5\n\n" | |
192 | ); | |
193 | ||
fbd55779 JD |
194 | #ifndef CONFIG_MODE_TT |
195 | ||
196 | static int __init no_skas_debug_setup(char *line, int *add) | |
197 | { | |
198 | printf("'debug' is not necessary to gdb UML in skas mode - run \n"); | |
199 | printf("'gdb linux' and disable CONFIG_CMDLINE_ON_HOST if gdb \n"); | |
200 | printf("doesn't work as expected\n"); | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | __uml_setup("debug", no_skas_debug_setup, | |
206 | "debug\n" | |
207 | " this flag is not needed to run gdb on UML in skas mode\n\n" | |
208 | ); | |
209 | ||
210 | #endif | |
211 | ||
1da177e4 LT |
212 | #ifdef CONFIG_SMP |
213 | static int __init uml_ncpus_setup(char *line, int *add) | |
214 | { | |
215 | if (!sscanf(line, "%d", &ncpus)) { | |
216 | printf("Couldn't parse [%s]\n", line); | |
217 | return -1; | |
218 | } | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | __uml_setup("ncpus=", uml_ncpus_setup, | |
224 | "ncpus=<# of desired CPUs>\n" | |
225 | " This tells an SMP kernel how many virtual processors to start.\n\n" | |
226 | ); | |
227 | #endif | |
228 | ||
229 | static int force_tt = 0; | |
230 | ||
231 | #if defined(CONFIG_MODE_TT) && defined(CONFIG_MODE_SKAS) | |
232 | #define DEFAULT_TT 0 | |
233 | ||
234 | static int __init mode_tt_setup(char *line, int *add) | |
235 | { | |
236 | force_tt = 1; | |
237 | return(0); | |
238 | } | |
239 | ||
240 | #else | |
241 | #ifdef CONFIG_MODE_SKAS | |
242 | ||
243 | #define DEFAULT_TT 0 | |
244 | ||
245 | static int __init mode_tt_setup(char *line, int *add) | |
246 | { | |
247 | printf("CONFIG_MODE_TT disabled - 'mode=tt' ignored\n"); | |
248 | return(0); | |
249 | } | |
250 | ||
251 | #else | |
252 | #ifdef CONFIG_MODE_TT | |
253 | ||
254 | #define DEFAULT_TT 1 | |
255 | ||
256 | static int __init mode_tt_setup(char *line, int *add) | |
257 | { | |
258 | printf("CONFIG_MODE_SKAS disabled - 'mode=tt' redundant\n"); | |
259 | return(0); | |
260 | } | |
261 | ||
1da177e4 LT |
262 | #endif |
263 | #endif | |
264 | #endif | |
265 | ||
266 | __uml_setup("mode=tt", mode_tt_setup, | |
267 | "mode=tt\n" | |
268 | " When both CONFIG_MODE_TT and CONFIG_MODE_SKAS are enabled, this option\n" | |
269 | " forces UML to run in tt (tracing thread) mode. It is not the default\n" | |
270 | " because it's slower and less secure than skas mode.\n\n" | |
271 | ); | |
272 | ||
273 | int mode_tt = DEFAULT_TT; | |
274 | ||
275 | static int __init Usage(char *line, int *add) | |
276 | { | |
277 | const char **p; | |
278 | ||
96b644bd | 279 | printf(usage_string, init_utsname()->release); |
1da177e4 LT |
280 | p = &__uml_help_start; |
281 | while (p < &__uml_help_end) { | |
282 | printf("%s", *p); | |
283 | p++; | |
284 | } | |
285 | exit(0); | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
290 | __uml_setup("--help", Usage, | |
291 | "--help\n" | |
292 | " Prints this message.\n\n" | |
293 | ); | |
294 | ||
295 | static int __init uml_checksetup(char *line, int *add) | |
296 | { | |
297 | struct uml_param *p; | |
298 | ||
299 | p = &__uml_setup_start; | |
300 | while(p < &__uml_setup_end) { | |
301 | int n; | |
302 | ||
303 | n = strlen(p->str); | |
304 | if(!strncmp(line, p->str, n)){ | |
305 | if (p->setup_func(line + n, add)) return 1; | |
306 | } | |
307 | p++; | |
308 | } | |
309 | return 0; | |
310 | } | |
311 | ||
312 | static void __init uml_postsetup(void) | |
313 | { | |
314 | initcall_t *p; | |
315 | ||
316 | p = &__uml_postsetup_start; | |
317 | while(p < &__uml_postsetup_end){ | |
318 | (*p)(); | |
319 | p++; | |
320 | } | |
321 | return; | |
322 | } | |
323 | ||
324 | /* Set during early boot */ | |
325 | unsigned long brk_start; | |
326 | unsigned long end_iomem; | |
327 | EXPORT_SYMBOL(end_iomem); | |
328 | ||
329 | #define MIN_VMALLOC (32 * 1024 * 1024) | |
330 | ||
23bbd586 JD |
331 | extern char __binary_start; |
332 | ||
1da177e4 LT |
333 | int linux_main(int argc, char **argv) |
334 | { | |
335 | unsigned long avail, diff; | |
336 | unsigned long virtmem_size, max_physmem; | |
337 | unsigned int i, add; | |
cb66504d | 338 | char * mode; |
1da177e4 LT |
339 | |
340 | for (i = 1; i < argc; i++){ | |
341 | if((i == 1) && (argv[i][0] == ' ')) continue; | |
342 | add = 1; | |
343 | uml_checksetup(argv[i], &add); | |
344 | if (add) | |
345 | add_arg(argv[i]); | |
346 | } | |
347 | if(have_root == 0) | |
348 | add_arg(DEFAULT_COMMAND_LINE); | |
349 | ||
60d339f6 | 350 | os_early_checks(); |
8923648c PBG |
351 | if (force_tt) |
352 | clear_can_do_skas(); | |
1da177e4 LT |
353 | mode_tt = force_tt ? 1 : !can_do_skas(); |
354 | #ifndef CONFIG_MODE_TT | |
355 | if (mode_tt) { | |
356 | /*Since CONFIG_MODE_TT is #undef'ed, force_tt cannot be 1. So, | |
357 | * can_do_skas() returned 0, and the message is correct. */ | |
358 | printf("Support for TT mode is disabled, and no SKAS support is present on the host.\n"); | |
359 | exit(1); | |
360 | } | |
361 | #endif | |
cb66504d PBG |
362 | |
363 | #ifndef CONFIG_MODE_SKAS | |
364 | mode = "TT"; | |
365 | #else | |
366 | /* Show to the user the result of selection */ | |
367 | if (mode_tt) | |
368 | mode = "TT"; | |
369 | else if (proc_mm && ptrace_faultinfo) | |
370 | mode = "SKAS3"; | |
371 | else | |
372 | mode = "SKAS0"; | |
373 | #endif | |
374 | ||
375 | printf("UML running in %s mode\n", mode); | |
376 | ||
23bbd586 JD |
377 | uml_start = (unsigned long) &__binary_start; |
378 | host_task_size = CHOOSE_MODE_PROC(set_task_sizes_tt, | |
379 | set_task_sizes_skas, &task_size); | |
1da177e4 | 380 | |
ea2ba7dc GS |
381 | /* |
382 | * Setting up handlers to 'sig_info' struct | |
383 | */ | |
384 | os_fill_handlinfo(handlinfo_kern); | |
385 | ||
1da177e4 LT |
386 | brk_start = (unsigned long) sbrk(0); |
387 | CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start); | |
388 | /* Increase physical memory size for exec-shield users | |
389 | so they actually get what they asked for. This should | |
390 | add zero for non-exec shield users */ | |
391 | ||
392 | diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); | |
393 | if(diff > 1024 * 1024){ | |
394 | printf("Adding %ld bytes to physical memory to account for " | |
395 | "exec-shield gap\n", diff); | |
396 | physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); | |
397 | } | |
398 | ||
23bbd586 | 399 | uml_physmem = uml_start & PAGE_MASK; |
1da177e4 LT |
400 | |
401 | /* Reserve up to 4M after the current brk */ | |
402 | uml_reserved = ROUND_4M(brk_start) + (1 << 22); | |
403 | ||
96b644bd | 404 | setup_machinename(init_utsname()->machine); |
1da177e4 | 405 | |
02215759 | 406 | #ifdef CONFIG_CMDLINE_ON_HOST |
1da177e4 LT |
407 | argv1_begin = argv[1]; |
408 | argv1_end = &argv[1][strlen(argv[1])]; | |
409 | #endif | |
410 | ||
411 | highmem = 0; | |
412 | iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK; | |
413 | max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC; | |
414 | ||
415 | /* Zones have to begin on a 1 << MAX_ORDER page boundary, | |
416 | * so this makes sure that's true for highmem | |
417 | */ | |
418 | max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1); | |
419 | if(physmem_size + iomem_size > max_physmem){ | |
420 | highmem = physmem_size + iomem_size - max_physmem; | |
421 | physmem_size -= highmem; | |
422 | #ifndef CONFIG_HIGHMEM | |
423 | highmem = 0; | |
424 | printf("CONFIG_HIGHMEM not enabled - physical memory shrunk " | |
d9f8b62a | 425 | "to %Lu bytes\n", physmem_size); |
1da177e4 LT |
426 | #endif |
427 | } | |
428 | ||
429 | high_physmem = uml_physmem + physmem_size; | |
430 | end_iomem = high_physmem + iomem_size; | |
431 | high_memory = (void *) end_iomem; | |
432 | ||
433 | start_vm = VMALLOC_START; | |
434 | ||
435 | setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem); | |
436 | if(init_maps(physmem_size, iomem_size, highmem)){ | |
d9f8b62a JD |
437 | printf("Failed to allocate mem_map for %Lu bytes of physical " |
438 | "memory and %Lu bytes of highmem\n", physmem_size, | |
1da177e4 LT |
439 | highmem); |
440 | exit(1); | |
441 | } | |
442 | ||
443 | virtmem_size = physmem_size; | |
444 | avail = get_kmem_end() - start_vm; | |
445 | if(physmem_size > avail) virtmem_size = avail; | |
446 | end_vm = start_vm + virtmem_size; | |
447 | ||
448 | if(virtmem_size < physmem_size) | |
ae173816 | 449 | printf("Kernel virtual memory size shrunk to %lu bytes\n", |
1da177e4 LT |
450 | virtmem_size); |
451 | ||
452 | uml_postsetup(); | |
453 | ||
454 | task_protections((unsigned long) &init_thread_info); | |
455 | os_flush_stdout(); | |
456 | ||
457 | return(CHOOSE_MODE(start_uml_tt(), start_uml_skas())); | |
458 | } | |
459 | ||
460 | extern int uml_exitcode; | |
461 | ||
462 | static int panic_exit(struct notifier_block *self, unsigned long unused1, | |
463 | void *unused2) | |
464 | { | |
465 | bust_spinlocks(1); | |
466 | show_regs(&(current->thread.regs)); | |
467 | bust_spinlocks(0); | |
468 | uml_exitcode = 1; | |
469 | machine_halt(); | |
470 | return(0); | |
471 | } | |
472 | ||
473 | static struct notifier_block panic_exit_notifier = { | |
474 | .notifier_call = panic_exit, | |
475 | .next = NULL, | |
476 | .priority = 0 | |
477 | }; | |
478 | ||
479 | void __init setup_arch(char **cmdline_p) | |
480 | { | |
e041c683 AS |
481 | atomic_notifier_chain_register(&panic_notifier_list, |
482 | &panic_exit_notifier); | |
1da177e4 | 483 | paging_init(); |
16c11163 | 484 | strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE); |
1da177e4 LT |
485 | *cmdline_p = command_line; |
486 | setup_hostinfo(); | |
487 | } | |
488 | ||
489 | void __init check_bugs(void) | |
490 | { | |
491 | arch_check_bugs(); | |
8e367065 | 492 | os_check_bugs(); |
1da177e4 LT |
493 | } |
494 | ||
9a0b5817 GH |
495 | void apply_alternatives(struct alt_instr *start, struct alt_instr *end) |
496 | { | |
497 | } | |
498 | ||
c61a8416 | 499 | #ifdef CONFIG_SMP |
9a0b5817 GH |
500 | void alternatives_smp_module_add(struct module *mod, char *name, |
501 | void *locks, void *locks_end, | |
502 | void *text, void *text_end) | |
503 | { | |
504 | } | |
505 | ||
506 | void alternatives_smp_module_del(struct module *mod) | |
1da177e4 LT |
507 | { |
508 | } | |
c61a8416 | 509 | #endif |