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" | |
cb66504d | 38 | #include "skas.h" |
1da177e4 LT |
39 | |
40 | #define DEFAULT_COMMAND_LINE "root=98:0" | |
41 | ||
1d1497e1 | 42 | /* Changed in add_arg and setup_arch, which run before SMP is started */ |
7a3a06d0 | 43 | static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 }; |
1da177e4 | 44 | |
7a3a06d0 | 45 | static void __init add_arg(char *arg) |
1da177e4 LT |
46 | { |
47 | if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) { | |
48 | printf("add_arg: Too many command line arguments!\n"); | |
49 | exit(1); | |
50 | } | |
51 | if(strlen(command_line) > 0) | |
52 | strcat(command_line, " "); | |
53 | strcat(command_line, arg); | |
54 | } | |
55 | ||
1d1497e1 JD |
56 | /* |
57 | * These fields are initialized at boot time and not changed. | |
58 | * XXX This structure is used only in the non-SMP case. Maybe this | |
59 | * should be moved to smp.c. | |
60 | */ | |
61 | struct cpuinfo_um boot_cpu_data = { | |
1da177e4 LT |
62 | .loops_per_jiffy = 0, |
63 | .ipi_pipe = { -1, -1 } | |
64 | }; | |
65 | ||
66 | unsigned long thread_saved_pc(struct task_struct *task) | |
67 | { | |
77bf4400 JD |
68 | /* FIXME: Need to look up userspace_pid by cpu */ |
69 | return os_process_pc(userspace_pid[0]); | |
1da177e4 LT |
70 | } |
71 | ||
b4ffb6ad JD |
72 | /* Changed in setup_arch, which is called in early boot */ |
73 | static char host_info[(__NEW_UTS_LEN + 1) * 5]; | |
74 | ||
1da177e4 LT |
75 | static int show_cpuinfo(struct seq_file *m, void *v) |
76 | { | |
77 | int index = 0; | |
78 | ||
79 | #ifdef CONFIG_SMP | |
80 | index = (struct cpuinfo_um *) v - cpu_data; | |
81 | if (!cpu_online(index)) | |
82 | return 0; | |
83 | #endif | |
84 | ||
85 | seq_printf(m, "processor\t: %d\n", index); | |
86 | seq_printf(m, "vendor_id\t: User Mode Linux\n"); | |
87 | seq_printf(m, "model name\t: UML\n"); | |
6aa802ce | 88 | seq_printf(m, "mode\t\t: skas\n"); |
1da177e4 LT |
89 | seq_printf(m, "host\t\t: %s\n", host_info); |
90 | seq_printf(m, "bogomips\t: %lu.%02lu\n\n", | |
91 | loops_per_jiffy/(500000/HZ), | |
92 | (loops_per_jiffy/(5000/HZ)) % 100); | |
93 | ||
a5ed1ffa | 94 | return 0; |
1da177e4 LT |
95 | } |
96 | ||
97 | static void *c_start(struct seq_file *m, loff_t *pos) | |
98 | { | |
99 | return *pos < NR_CPUS ? cpu_data + *pos : NULL; | |
100 | } | |
101 | ||
102 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) | |
103 | { | |
104 | ++*pos; | |
105 | return c_start(m, pos); | |
106 | } | |
107 | ||
108 | static void c_stop(struct seq_file *m, void *v) | |
109 | { | |
110 | } | |
111 | ||
5e7672ec | 112 | const struct seq_operations cpuinfo_op = { |
1da177e4 LT |
113 | .start = c_start, |
114 | .next = c_next, | |
115 | .stop = c_stop, | |
116 | .show = show_cpuinfo, | |
117 | }; | |
118 | ||
1da177e4 LT |
119 | /* Set in linux_main */ |
120 | unsigned long host_task_size; | |
121 | unsigned long task_size; | |
1da177e4 | 122 | unsigned long uml_physmem; |
1d1497e1 | 123 | unsigned long uml_reserved; /* Also modified in mem_init */ |
1da177e4 LT |
124 | unsigned long start_vm; |
125 | unsigned long end_vm; | |
1d1497e1 JD |
126 | |
127 | /* Set in uml_ncpus_setup */ | |
1da177e4 LT |
128 | int ncpus = 1; |
129 | ||
1da177e4 LT |
130 | /* Set in early boot */ |
131 | static int have_root __initdata = 0; | |
1d1497e1 JD |
132 | |
133 | /* Set in uml_mem_setup and modified in linux_main */ | |
ae173816 | 134 | long long physmem_size = 32 * 1024 * 1024; |
1da177e4 | 135 | |
1da177e4 LT |
136 | static char *usage_string = |
137 | "User Mode Linux v%s\n" | |
138 | " available at http://user-mode-linux.sourceforge.net/\n\n"; | |
139 | ||
140 | static int __init uml_version_setup(char *line, int *add) | |
141 | { | |
96b644bd | 142 | printf("%s\n", init_utsname()->release); |
1da177e4 LT |
143 | exit(0); |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
148 | __uml_setup("--version", uml_version_setup, | |
149 | "--version\n" | |
150 | " Prints the version number of the kernel.\n\n" | |
151 | ); | |
152 | ||
153 | static int __init uml_root_setup(char *line, int *add) | |
154 | { | |
155 | have_root = 1; | |
156 | return 0; | |
157 | } | |
158 | ||
159 | __uml_setup("root=", uml_root_setup, | |
160 | "root=<file containing the root fs>\n" | |
161 | " This is actually used by the generic kernel in exactly the same\n" | |
162 | " way as in any other kernel. If you configure a number of block\n" | |
163 | " devices and want to boot off something other than ubd0, you \n" | |
164 | " would use something like:\n" | |
165 | " root=/dev/ubd5\n\n" | |
166 | ); | |
167 | ||
fbd55779 JD |
168 | static int __init no_skas_debug_setup(char *line, int *add) |
169 | { | |
170 | printf("'debug' is not necessary to gdb UML in skas mode - run \n"); | |
42fda663 | 171 | printf("'gdb linux'"); |
fbd55779 JD |
172 | |
173 | return 0; | |
174 | } | |
175 | ||
176 | __uml_setup("debug", no_skas_debug_setup, | |
177 | "debug\n" | |
178 | " this flag is not needed to run gdb on UML in skas mode\n\n" | |
179 | ); | |
180 | ||
1da177e4 LT |
181 | #ifdef CONFIG_SMP |
182 | static int __init uml_ncpus_setup(char *line, int *add) | |
183 | { | |
a5ed1ffa JD |
184 | if (!sscanf(line, "%d", &ncpus)) { |
185 | printf("Couldn't parse [%s]\n", line); | |
186 | return -1; | |
187 | } | |
1da177e4 | 188 | |
a5ed1ffa | 189 | return 0; |
1da177e4 LT |
190 | } |
191 | ||
192 | __uml_setup("ncpus=", uml_ncpus_setup, | |
193 | "ncpus=<# of desired CPUs>\n" | |
194 | " This tells an SMP kernel how many virtual processors to start.\n\n" | |
195 | ); | |
196 | #endif | |
197 | ||
1da177e4 LT |
198 | static int __init Usage(char *line, int *add) |
199 | { | |
a5ed1ffa | 200 | const char **p; |
1da177e4 | 201 | |
96b644bd | 202 | printf(usage_string, init_utsname()->release); |
a5ed1ffa JD |
203 | p = &__uml_help_start; |
204 | while (p < &__uml_help_end) { | |
205 | printf("%s", *p); | |
206 | p++; | |
207 | } | |
1da177e4 | 208 | exit(0); |
1da177e4 LT |
209 | return 0; |
210 | } | |
211 | ||
212 | __uml_setup("--help", Usage, | |
213 | "--help\n" | |
214 | " Prints this message.\n\n" | |
215 | ); | |
216 | ||
217 | static int __init uml_checksetup(char *line, int *add) | |
218 | { | |
219 | struct uml_param *p; | |
220 | ||
221 | p = &__uml_setup_start; | |
222 | while(p < &__uml_setup_end) { | |
223 | int n; | |
224 | ||
225 | n = strlen(p->str); | |
226 | if(!strncmp(line, p->str, n)){ | |
227 | if (p->setup_func(line + n, add)) return 1; | |
228 | } | |
229 | p++; | |
230 | } | |
231 | return 0; | |
232 | } | |
233 | ||
234 | static void __init uml_postsetup(void) | |
235 | { | |
236 | initcall_t *p; | |
237 | ||
238 | p = &__uml_postsetup_start; | |
239 | while(p < &__uml_postsetup_end){ | |
240 | (*p)(); | |
241 | p++; | |
242 | } | |
243 | return; | |
244 | } | |
245 | ||
246 | /* Set during early boot */ | |
247 | unsigned long brk_start; | |
248 | unsigned long end_iomem; | |
249 | EXPORT_SYMBOL(end_iomem); | |
250 | ||
251 | #define MIN_VMALLOC (32 * 1024 * 1024) | |
252 | ||
23bbd586 JD |
253 | extern char __binary_start; |
254 | ||
77bf4400 JD |
255 | static unsigned long set_task_sizes_skas(unsigned long *task_size_out) |
256 | { | |
257 | /* Round up to the nearest 4M */ | |
258 | unsigned long host_task_size = ROUND_4M((unsigned long) | |
259 | &host_task_size); | |
260 | ||
261 | if (!skas_needs_stub) | |
262 | *task_size_out = host_task_size; | |
263 | else *task_size_out = CONFIG_STUB_START & PGDIR_MASK; | |
264 | ||
265 | return host_task_size; | |
266 | } | |
267 | ||
7a3a06d0 | 268 | int __init linux_main(int argc, char **argv) |
1da177e4 LT |
269 | { |
270 | unsigned long avail, diff; | |
271 | unsigned long virtmem_size, max_physmem; | |
272 | unsigned int i, add; | |
cb66504d | 273 | char * mode; |
1da177e4 LT |
274 | |
275 | for (i = 1; i < argc; i++){ | |
276 | if((i == 1) && (argv[i][0] == ' ')) continue; | |
277 | add = 1; | |
278 | uml_checksetup(argv[i], &add); | |
279 | if (add) | |
280 | add_arg(argv[i]); | |
281 | } | |
282 | if(have_root == 0) | |
283 | add_arg(DEFAULT_COMMAND_LINE); | |
284 | ||
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 | ||
6aa802ce | 296 | host_task_size = set_task_sizes_skas(&task_size); |
1da177e4 | 297 | |
ea2ba7dc | 298 | /* |
a5ed1ffa JD |
299 | * Setting up handlers to 'sig_info' struct |
300 | */ | |
ea2ba7dc GS |
301 | os_fill_handlinfo(handlinfo_kern); |
302 | ||
1da177e4 | 303 | brk_start = (unsigned long) sbrk(0); |
77bf4400 | 304 | |
1da177e4 LT |
305 | /* Increase physical memory size for exec-shield users |
306 | so they actually get what they asked for. This should | |
307 | add zero for non-exec shield users */ | |
308 | ||
309 | diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); | |
310 | if(diff > 1024 * 1024){ | |
311 | printf("Adding %ld bytes to physical memory to account for " | |
312 | "exec-shield gap\n", diff); | |
313 | physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); | |
314 | } | |
315 | ||
1d1497e1 | 316 | uml_physmem = (unsigned long) &__binary_start & PAGE_MASK; |
1da177e4 LT |
317 | |
318 | /* Reserve up to 4M after the current brk */ | |
319 | uml_reserved = ROUND_4M(brk_start) + (1 << 22); | |
320 | ||
96b644bd | 321 | setup_machinename(init_utsname()->machine); |
1da177e4 | 322 | |
1da177e4 LT |
323 | highmem = 0; |
324 | iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK; | |
325 | max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC; | |
326 | ||
327 | /* Zones have to begin on a 1 << MAX_ORDER page boundary, | |
328 | * so this makes sure that's true for highmem | |
329 | */ | |
330 | max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1); | |
331 | if(physmem_size + iomem_size > max_physmem){ | |
332 | highmem = physmem_size + iomem_size - max_physmem; | |
333 | physmem_size -= highmem; | |
334 | #ifndef CONFIG_HIGHMEM | |
335 | highmem = 0; | |
336 | printf("CONFIG_HIGHMEM not enabled - physical memory shrunk " | |
d9f8b62a | 337 | "to %Lu bytes\n", physmem_size); |
1da177e4 LT |
338 | #endif |
339 | } | |
340 | ||
341 | high_physmem = uml_physmem + physmem_size; | |
342 | end_iomem = high_physmem + iomem_size; | |
343 | high_memory = (void *) end_iomem; | |
344 | ||
345 | start_vm = VMALLOC_START; | |
346 | ||
347 | setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem); | |
348 | if(init_maps(physmem_size, iomem_size, highmem)){ | |
d9f8b62a JD |
349 | printf("Failed to allocate mem_map for %Lu bytes of physical " |
350 | "memory and %Lu bytes of highmem\n", physmem_size, | |
1da177e4 LT |
351 | highmem); |
352 | exit(1); | |
353 | } | |
354 | ||
355 | virtmem_size = physmem_size; | |
356 | avail = get_kmem_end() - start_vm; | |
357 | if(physmem_size > avail) virtmem_size = avail; | |
358 | end_vm = start_vm + virtmem_size; | |
359 | ||
360 | if(virtmem_size < physmem_size) | |
ae173816 | 361 | printf("Kernel virtual memory size shrunk to %lu bytes\n", |
1da177e4 LT |
362 | virtmem_size); |
363 | ||
a5ed1ffa | 364 | uml_postsetup(); |
1da177e4 | 365 | |
57598fd7 | 366 | stack_protections((unsigned long) &init_thread_info); |
1da177e4 LT |
367 | os_flush_stdout(); |
368 | ||
77bf4400 | 369 | return start_uml(); |
1da177e4 LT |
370 | } |
371 | ||
372 | extern int uml_exitcode; | |
373 | ||
374 | static int panic_exit(struct notifier_block *self, unsigned long unused1, | |
375 | void *unused2) | |
376 | { | |
377 | bust_spinlocks(1); | |
378 | show_regs(&(current->thread.regs)); | |
379 | bust_spinlocks(0); | |
380 | uml_exitcode = 1; | |
63843c26 | 381 | os_dump_core(); |
a5ed1ffa | 382 | return 0; |
1da177e4 LT |
383 | } |
384 | ||
385 | static struct notifier_block panic_exit_notifier = { | |
386 | .notifier_call = panic_exit, | |
387 | .next = NULL, | |
388 | .priority = 0 | |
389 | }; | |
390 | ||
391 | void __init setup_arch(char **cmdline_p) | |
392 | { | |
e041c683 AS |
393 | atomic_notifier_chain_register(&panic_notifier_list, |
394 | &panic_exit_notifier); | |
1da177e4 | 395 | paging_init(); |
19bf7e7a | 396 | strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); |
a5ed1ffa | 397 | *cmdline_p = command_line; |
b4ffb6ad | 398 | setup_hostinfo(host_info, sizeof host_info); |
1da177e4 LT |
399 | } |
400 | ||
401 | void __init check_bugs(void) | |
402 | { | |
403 | arch_check_bugs(); | |
a5ed1ffa | 404 | os_check_bugs(); |
1da177e4 LT |
405 | } |
406 | ||
9a0b5817 GH |
407 | void apply_alternatives(struct alt_instr *start, struct alt_instr *end) |
408 | { | |
409 | } | |
410 | ||
c61a8416 | 411 | #ifdef CONFIG_SMP |
9a0b5817 GH |
412 | void alternatives_smp_module_add(struct module *mod, char *name, |
413 | void *locks, void *locks_end, | |
414 | void *text, void *text_end) | |
415 | { | |
416 | } | |
417 | ||
418 | void alternatives_smp_module_del(struct module *mod) | |
1da177e4 LT |
419 | { |
420 | } | |
c61a8416 | 421 | #endif |