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