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" | |
b4ffb6ad | 20 | #include "linux/utsname.h" |
1da177e4 LT |
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 | 29 | #include "kern_util.h" |
4ff83ce1 | 30 | #include "as-layout.h" |
eb830759 | 31 | #include "arch.h" |
1da177e4 LT |
32 | #include "kern.h" |
33 | #include "mem_user.h" | |
34 | #include "mem.h" | |
1da177e4 LT |
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 | ||
1d1497e1 | 47 | /* Changed in add_arg and setup_arch, which run before SMP is started */ |
7a3a06d0 | 48 | static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 }; |
1da177e4 | 49 | |
7a3a06d0 | 50 | static void __init 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 | ||
1d1497e1 JD |
61 | /* |
62 | * These fields are initialized at boot time and not changed. | |
63 | * XXX This structure is used only in the non-SMP case. Maybe this | |
64 | * should be moved to smp.c. | |
65 | */ | |
66 | struct cpuinfo_um boot_cpu_data = { | |
1da177e4 LT |
67 | .loops_per_jiffy = 0, |
68 | .ipi_pipe = { -1, -1 } | |
69 | }; | |
70 | ||
71 | unsigned long thread_saved_pc(struct task_struct *task) | |
72 | { | |
a5ed1ffa JD |
73 | return os_process_pc(CHOOSE_MODE_PROC(thread_pid_tt, thread_pid_skas, |
74 | task)); | |
1da177e4 LT |
75 | } |
76 | ||
b4ffb6ad JD |
77 | /* Changed in setup_arch, which is called in early boot */ |
78 | static char host_info[(__NEW_UTS_LEN + 1) * 5]; | |
79 | ||
1da177e4 LT |
80 | static int show_cpuinfo(struct seq_file *m, void *v) |
81 | { | |
82 | int index = 0; | |
83 | ||
84 | #ifdef CONFIG_SMP | |
85 | index = (struct cpuinfo_um *) v - cpu_data; | |
86 | if (!cpu_online(index)) | |
87 | return 0; | |
88 | #endif | |
89 | ||
90 | seq_printf(m, "processor\t: %d\n", index); | |
91 | seq_printf(m, "vendor_id\t: User Mode Linux\n"); | |
92 | seq_printf(m, "model name\t: UML\n"); | |
93 | seq_printf(m, "mode\t\t: %s\n", CHOOSE_MODE("tt", "skas")); | |
94 | seq_printf(m, "host\t\t: %s\n", host_info); | |
95 | seq_printf(m, "bogomips\t: %lu.%02lu\n\n", | |
96 | loops_per_jiffy/(500000/HZ), | |
97 | (loops_per_jiffy/(5000/HZ)) % 100); | |
98 | ||
a5ed1ffa | 99 | return 0; |
1da177e4 LT |
100 | } |
101 | ||
102 | static void *c_start(struct seq_file *m, loff_t *pos) | |
103 | { | |
104 | return *pos < NR_CPUS ? cpu_data + *pos : NULL; | |
105 | } | |
106 | ||
107 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) | |
108 | { | |
109 | ++*pos; | |
110 | return c_start(m, pos); | |
111 | } | |
112 | ||
113 | static void c_stop(struct seq_file *m, void *v) | |
114 | { | |
115 | } | |
116 | ||
5e7672ec | 117 | const struct seq_operations cpuinfo_op = { |
1da177e4 LT |
118 | .start = c_start, |
119 | .next = c_next, | |
120 | .stop = c_stop, | |
121 | .show = show_cpuinfo, | |
122 | }; | |
123 | ||
1da177e4 LT |
124 | /* Set in linux_main */ |
125 | unsigned long host_task_size; | |
126 | unsigned long task_size; | |
1da177e4 | 127 | unsigned long uml_physmem; |
1d1497e1 | 128 | unsigned long uml_reserved; /* Also modified in mem_init */ |
1da177e4 LT |
129 | unsigned long start_vm; |
130 | unsigned long end_vm; | |
1d1497e1 JD |
131 | |
132 | /* Set in uml_ncpus_setup */ | |
1da177e4 LT |
133 | int ncpus = 1; |
134 | ||
02215759 | 135 | #ifdef CONFIG_CMDLINE_ON_HOST |
1da177e4 LT |
136 | /* Pointer set in linux_main, the array itself is private to each thread, |
137 | * and changed at address space creation time so this poses no concurrency | |
138 | * problems. | |
139 | */ | |
140 | static char *argv1_begin = NULL; | |
141 | static char *argv1_end = NULL; | |
142 | #endif | |
143 | ||
144 | /* Set in early boot */ | |
145 | static int have_root __initdata = 0; | |
1d1497e1 JD |
146 | |
147 | /* Set in uml_mem_setup and modified in linux_main */ | |
ae173816 | 148 | long long physmem_size = 32 * 1024 * 1024; |
1da177e4 LT |
149 | |
150 | void set_cmdline(char *cmd) | |
151 | { | |
02215759 | 152 | #ifdef CONFIG_CMDLINE_ON_HOST |
1da177e4 LT |
153 | char *umid, *ptr; |
154 | ||
155 | if(CHOOSE_MODE(honeypot, 0)) return; | |
156 | ||
7eebe8a9 JD |
157 | umid = get_umid(); |
158 | if(*umid != '\0'){ | |
1da177e4 LT |
159 | snprintf(argv1_begin, |
160 | (argv1_end - argv1_begin) * sizeof(*ptr), | |
161 | "(%s) ", umid); | |
162 | ptr = &argv1_begin[strlen(argv1_begin)]; | |
163 | } | |
164 | else ptr = argv1_begin; | |
165 | ||
166 | snprintf(ptr, (argv1_end - ptr) * sizeof(*ptr), "[%s]", cmd); | |
167 | memset(argv1_begin + strlen(argv1_begin), '\0', | |
168 | argv1_end - argv1_begin - strlen(argv1_begin)); | |
169 | #endif | |
170 | } | |
171 | ||
172 | static char *usage_string = | |
173 | "User Mode Linux v%s\n" | |
174 | " available at http://user-mode-linux.sourceforge.net/\n\n"; | |
175 | ||
176 | static int __init uml_version_setup(char *line, int *add) | |
177 | { | |
96b644bd | 178 | printf("%s\n", init_utsname()->release); |
1da177e4 LT |
179 | exit(0); |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
184 | __uml_setup("--version", uml_version_setup, | |
185 | "--version\n" | |
186 | " Prints the version number of the kernel.\n\n" | |
187 | ); | |
188 | ||
189 | static int __init uml_root_setup(char *line, int *add) | |
190 | { | |
191 | have_root = 1; | |
192 | return 0; | |
193 | } | |
194 | ||
195 | __uml_setup("root=", uml_root_setup, | |
196 | "root=<file containing the root fs>\n" | |
197 | " This is actually used by the generic kernel in exactly the same\n" | |
198 | " way as in any other kernel. If you configure a number of block\n" | |
199 | " devices and want to boot off something other than ubd0, you \n" | |
200 | " would use something like:\n" | |
201 | " root=/dev/ubd5\n\n" | |
202 | ); | |
203 | ||
fbd55779 JD |
204 | #ifndef CONFIG_MODE_TT |
205 | ||
206 | static int __init no_skas_debug_setup(char *line, int *add) | |
207 | { | |
208 | printf("'debug' is not necessary to gdb UML in skas mode - run \n"); | |
209 | printf("'gdb linux' and disable CONFIG_CMDLINE_ON_HOST if gdb \n"); | |
210 | printf("doesn't work as expected\n"); | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
215 | __uml_setup("debug", no_skas_debug_setup, | |
216 | "debug\n" | |
217 | " this flag is not needed to run gdb on UML in skas mode\n\n" | |
218 | ); | |
219 | ||
220 | #endif | |
221 | ||
1da177e4 LT |
222 | #ifdef CONFIG_SMP |
223 | static int __init uml_ncpus_setup(char *line, int *add) | |
224 | { | |
a5ed1ffa JD |
225 | if (!sscanf(line, "%d", &ncpus)) { |
226 | printf("Couldn't parse [%s]\n", line); | |
227 | return -1; | |
228 | } | |
1da177e4 | 229 | |
a5ed1ffa | 230 | return 0; |
1da177e4 LT |
231 | } |
232 | ||
233 | __uml_setup("ncpus=", uml_ncpus_setup, | |
234 | "ncpus=<# of desired CPUs>\n" | |
235 | " This tells an SMP kernel how many virtual processors to start.\n\n" | |
236 | ); | |
237 | #endif | |
238 | ||
239 | static int force_tt = 0; | |
240 | ||
241 | #if defined(CONFIG_MODE_TT) && defined(CONFIG_MODE_SKAS) | |
242 | #define DEFAULT_TT 0 | |
243 | ||
244 | static int __init mode_tt_setup(char *line, int *add) | |
245 | { | |
246 | force_tt = 1; | |
a5ed1ffa | 247 | return 0; |
1da177e4 LT |
248 | } |
249 | ||
250 | #else | |
251 | #ifdef CONFIG_MODE_SKAS | |
252 | ||
253 | #define DEFAULT_TT 0 | |
254 | ||
255 | static int __init mode_tt_setup(char *line, int *add) | |
256 | { | |
257 | printf("CONFIG_MODE_TT disabled - 'mode=tt' ignored\n"); | |
a5ed1ffa | 258 | return 0; |
1da177e4 LT |
259 | } |
260 | ||
261 | #else | |
262 | #ifdef CONFIG_MODE_TT | |
263 | ||
264 | #define DEFAULT_TT 1 | |
265 | ||
266 | static int __init mode_tt_setup(char *line, int *add) | |
267 | { | |
268 | printf("CONFIG_MODE_SKAS disabled - 'mode=tt' redundant\n"); | |
a5ed1ffa | 269 | return 0; |
1da177e4 LT |
270 | } |
271 | ||
1da177e4 LT |
272 | #endif |
273 | #endif | |
274 | #endif | |
275 | ||
276 | __uml_setup("mode=tt", mode_tt_setup, | |
277 | "mode=tt\n" | |
278 | " When both CONFIG_MODE_TT and CONFIG_MODE_SKAS are enabled, this option\n" | |
279 | " forces UML to run in tt (tracing thread) mode. It is not the default\n" | |
280 | " because it's slower and less secure than skas mode.\n\n" | |
281 | ); | |
282 | ||
283 | int mode_tt = DEFAULT_TT; | |
284 | ||
285 | static int __init Usage(char *line, int *add) | |
286 | { | |
a5ed1ffa | 287 | const char **p; |
1da177e4 | 288 | |
96b644bd | 289 | printf(usage_string, init_utsname()->release); |
a5ed1ffa JD |
290 | p = &__uml_help_start; |
291 | while (p < &__uml_help_end) { | |
292 | printf("%s", *p); | |
293 | p++; | |
294 | } | |
1da177e4 | 295 | exit(0); |
1da177e4 LT |
296 | return 0; |
297 | } | |
298 | ||
299 | __uml_setup("--help", Usage, | |
300 | "--help\n" | |
301 | " Prints this message.\n\n" | |
302 | ); | |
303 | ||
304 | static int __init uml_checksetup(char *line, int *add) | |
305 | { | |
306 | struct uml_param *p; | |
307 | ||
308 | p = &__uml_setup_start; | |
309 | while(p < &__uml_setup_end) { | |
310 | int n; | |
311 | ||
312 | n = strlen(p->str); | |
313 | if(!strncmp(line, p->str, n)){ | |
314 | if (p->setup_func(line + n, add)) return 1; | |
315 | } | |
316 | p++; | |
317 | } | |
318 | return 0; | |
319 | } | |
320 | ||
321 | static void __init uml_postsetup(void) | |
322 | { | |
323 | initcall_t *p; | |
324 | ||
325 | p = &__uml_postsetup_start; | |
326 | while(p < &__uml_postsetup_end){ | |
327 | (*p)(); | |
328 | p++; | |
329 | } | |
330 | return; | |
331 | } | |
332 | ||
333 | /* Set during early boot */ | |
334 | unsigned long brk_start; | |
335 | unsigned long end_iomem; | |
336 | EXPORT_SYMBOL(end_iomem); | |
337 | ||
338 | #define MIN_VMALLOC (32 * 1024 * 1024) | |
339 | ||
23bbd586 JD |
340 | extern char __binary_start; |
341 | ||
7a3a06d0 | 342 | int __init linux_main(int argc, char **argv) |
1da177e4 LT |
343 | { |
344 | unsigned long avail, diff; | |
345 | unsigned long virtmem_size, max_physmem; | |
346 | unsigned int i, add; | |
cb66504d | 347 | char * mode; |
1da177e4 LT |
348 | |
349 | for (i = 1; i < argc; i++){ | |
350 | if((i == 1) && (argv[i][0] == ' ')) continue; | |
351 | add = 1; | |
352 | uml_checksetup(argv[i], &add); | |
353 | if (add) | |
354 | add_arg(argv[i]); | |
355 | } | |
356 | if(have_root == 0) | |
357 | add_arg(DEFAULT_COMMAND_LINE); | |
358 | ||
60d339f6 | 359 | os_early_checks(); |
8923648c PBG |
360 | if (force_tt) |
361 | clear_can_do_skas(); | |
1da177e4 LT |
362 | mode_tt = force_tt ? 1 : !can_do_skas(); |
363 | #ifndef CONFIG_MODE_TT | |
364 | if (mode_tt) { | |
365 | /*Since CONFIG_MODE_TT is #undef'ed, force_tt cannot be 1. So, | |
366 | * can_do_skas() returned 0, and the message is correct. */ | |
367 | printf("Support for TT mode is disabled, and no SKAS support is present on the host.\n"); | |
368 | exit(1); | |
369 | } | |
370 | #endif | |
cb66504d PBG |
371 | |
372 | #ifndef CONFIG_MODE_SKAS | |
373 | mode = "TT"; | |
374 | #else | |
375 | /* Show to the user the result of selection */ | |
376 | if (mode_tt) | |
377 | mode = "TT"; | |
378 | else if (proc_mm && ptrace_faultinfo) | |
379 | mode = "SKAS3"; | |
380 | else | |
381 | mode = "SKAS0"; | |
382 | #endif | |
383 | ||
384 | printf("UML running in %s mode\n", mode); | |
385 | ||
23bbd586 JD |
386 | host_task_size = CHOOSE_MODE_PROC(set_task_sizes_tt, |
387 | set_task_sizes_skas, &task_size); | |
1da177e4 | 388 | |
ea2ba7dc | 389 | /* |
a5ed1ffa JD |
390 | * Setting up handlers to 'sig_info' struct |
391 | */ | |
ea2ba7dc GS |
392 | os_fill_handlinfo(handlinfo_kern); |
393 | ||
1da177e4 LT |
394 | brk_start = (unsigned long) sbrk(0); |
395 | CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start); | |
396 | /* Increase physical memory size for exec-shield users | |
397 | so they actually get what they asked for. This should | |
398 | add zero for non-exec shield users */ | |
399 | ||
400 | diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); | |
401 | if(diff > 1024 * 1024){ | |
402 | printf("Adding %ld bytes to physical memory to account for " | |
403 | "exec-shield gap\n", diff); | |
404 | physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); | |
405 | } | |
406 | ||
1d1497e1 | 407 | uml_physmem = (unsigned long) &__binary_start & PAGE_MASK; |
1da177e4 LT |
408 | |
409 | /* Reserve up to 4M after the current brk */ | |
410 | uml_reserved = ROUND_4M(brk_start) + (1 << 22); | |
411 | ||
96b644bd | 412 | setup_machinename(init_utsname()->machine); |
1da177e4 | 413 | |
02215759 | 414 | #ifdef CONFIG_CMDLINE_ON_HOST |
1da177e4 LT |
415 | argv1_begin = argv[1]; |
416 | argv1_end = &argv[1][strlen(argv[1])]; | |
417 | #endif | |
a5ed1ffa | 418 | |
1da177e4 LT |
419 | highmem = 0; |
420 | iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK; | |
421 | max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC; | |
422 | ||
423 | /* Zones have to begin on a 1 << MAX_ORDER page boundary, | |
424 | * so this makes sure that's true for highmem | |
425 | */ | |
426 | max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1); | |
427 | if(physmem_size + iomem_size > max_physmem){ | |
428 | highmem = physmem_size + iomem_size - max_physmem; | |
429 | physmem_size -= highmem; | |
430 | #ifndef CONFIG_HIGHMEM | |
431 | highmem = 0; | |
432 | printf("CONFIG_HIGHMEM not enabled - physical memory shrunk " | |
d9f8b62a | 433 | "to %Lu bytes\n", physmem_size); |
1da177e4 LT |
434 | #endif |
435 | } | |
436 | ||
437 | high_physmem = uml_physmem + physmem_size; | |
438 | end_iomem = high_physmem + iomem_size; | |
439 | high_memory = (void *) end_iomem; | |
440 | ||
441 | start_vm = VMALLOC_START; | |
442 | ||
443 | setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem); | |
444 | if(init_maps(physmem_size, iomem_size, highmem)){ | |
d9f8b62a JD |
445 | printf("Failed to allocate mem_map for %Lu bytes of physical " |
446 | "memory and %Lu bytes of highmem\n", physmem_size, | |
1da177e4 LT |
447 | highmem); |
448 | exit(1); | |
449 | } | |
450 | ||
451 | virtmem_size = physmem_size; | |
452 | avail = get_kmem_end() - start_vm; | |
453 | if(physmem_size > avail) virtmem_size = avail; | |
454 | end_vm = start_vm + virtmem_size; | |
455 | ||
456 | if(virtmem_size < physmem_size) | |
ae173816 | 457 | printf("Kernel virtual memory size shrunk to %lu bytes\n", |
1da177e4 LT |
458 | virtmem_size); |
459 | ||
a5ed1ffa | 460 | uml_postsetup(); |
1da177e4 LT |
461 | |
462 | task_protections((unsigned long) &init_thread_info); | |
463 | os_flush_stdout(); | |
464 | ||
a5ed1ffa | 465 | return CHOOSE_MODE(start_uml_tt(), start_uml_skas()); |
1da177e4 LT |
466 | } |
467 | ||
468 | extern int uml_exitcode; | |
469 | ||
470 | static int panic_exit(struct notifier_block *self, unsigned long unused1, | |
471 | void *unused2) | |
472 | { | |
473 | bust_spinlocks(1); | |
474 | show_regs(&(current->thread.regs)); | |
475 | bust_spinlocks(0); | |
476 | uml_exitcode = 1; | |
63843c26 | 477 | os_dump_core(); |
a5ed1ffa | 478 | return 0; |
1da177e4 LT |
479 | } |
480 | ||
481 | static struct notifier_block panic_exit_notifier = { | |
482 | .notifier_call = panic_exit, | |
483 | .next = NULL, | |
484 | .priority = 0 | |
485 | }; | |
486 | ||
487 | void __init setup_arch(char **cmdline_p) | |
488 | { | |
e041c683 AS |
489 | atomic_notifier_chain_register(&panic_notifier_list, |
490 | &panic_exit_notifier); | |
1da177e4 | 491 | paging_init(); |
19bf7e7a | 492 | strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); |
a5ed1ffa | 493 | *cmdline_p = command_line; |
b4ffb6ad | 494 | setup_hostinfo(host_info, sizeof host_info); |
1da177e4 LT |
495 | } |
496 | ||
497 | void __init check_bugs(void) | |
498 | { | |
499 | arch_check_bugs(); | |
a5ed1ffa | 500 | os_check_bugs(); |
1da177e4 LT |
501 | } |
502 | ||
9a0b5817 GH |
503 | void apply_alternatives(struct alt_instr *start, struct alt_instr *end) |
504 | { | |
505 | } | |
506 | ||
c61a8416 | 507 | #ifdef CONFIG_SMP |
9a0b5817 GH |
508 | void alternatives_smp_module_add(struct module *mod, char *name, |
509 | void *locks, void *locks_end, | |
510 | void *text, void *text_end) | |
511 | { | |
512 | } | |
513 | ||
514 | void alternatives_smp_module_del(struct module *mod) | |
1da177e4 LT |
515 | { |
516 | } | |
c61a8416 | 517 | #endif |