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Commit | Line | Data |
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ea2ba7dc | 1 | /* |
ba180fd4 | 2 | * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
c5d4bb17 JD |
6 | #include <linux/delay.h> |
7 | #include <linux/init.h> | |
8 | #include <linux/mm.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/seq_file.h> | |
11 | #include <linux/string.h> | |
12 | #include <linux/utsname.h> | |
5b408241 | 13 | #include <linux/sched.h> |
c5d4bb17 JD |
14 | #include <asm/pgtable.h> |
15 | #include <asm/processor.h> | |
16 | #include <asm/setup.h> | |
37185b33 AV |
17 | #include <as-layout.h> |
18 | #include <arch.h> | |
19 | #include <init.h> | |
20 | #include <kern.h> | |
21 | #include <kern_util.h> | |
22 | #include <mem_user.h> | |
23 | #include <os.h> | |
1da177e4 LT |
24 | |
25 | #define DEFAULT_COMMAND_LINE "root=98:0" | |
26 | ||
1d1497e1 | 27 | /* Changed in add_arg and setup_arch, which run before SMP is started */ |
7a3a06d0 | 28 | static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 }; |
1da177e4 | 29 | |
7a3a06d0 | 30 | static void __init add_arg(char *arg) |
1da177e4 LT |
31 | { |
32 | if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) { | |
33 | printf("add_arg: Too many command line arguments!\n"); | |
34 | exit(1); | |
35 | } | |
ba180fd4 | 36 | if (strlen(command_line) > 0) |
1da177e4 LT |
37 | strcat(command_line, " "); |
38 | strcat(command_line, arg); | |
39 | } | |
40 | ||
1d1497e1 JD |
41 | /* |
42 | * These fields are initialized at boot time and not changed. | |
43 | * XXX This structure is used only in the non-SMP case. Maybe this | |
44 | * should be moved to smp.c. | |
45 | */ | |
46 | struct cpuinfo_um boot_cpu_data = { | |
1da177e4 LT |
47 | .loops_per_jiffy = 0, |
48 | .ipi_pipe = { -1, -1 } | |
49 | }; | |
50 | ||
5b408241 TG |
51 | union thread_union cpu0_irqstack |
52 | __attribute__((__section__(".data..init_irqstack"))) = | |
53 | { INIT_THREAD_INFO(init_task) }; | |
54 | ||
1da177e4 LT |
55 | unsigned long thread_saved_pc(struct task_struct *task) |
56 | { | |
77bf4400 JD |
57 | /* FIXME: Need to look up userspace_pid by cpu */ |
58 | return os_process_pc(userspace_pid[0]); | |
1da177e4 LT |
59 | } |
60 | ||
b4ffb6ad JD |
61 | /* Changed in setup_arch, which is called in early boot */ |
62 | static char host_info[(__NEW_UTS_LEN + 1) * 5]; | |
63 | ||
1da177e4 LT |
64 | static int show_cpuinfo(struct seq_file *m, void *v) |
65 | { | |
66 | int index = 0; | |
67 | ||
68 | #ifdef CONFIG_SMP | |
69 | index = (struct cpuinfo_um *) v - cpu_data; | |
70 | if (!cpu_online(index)) | |
71 | return 0; | |
72 | #endif | |
73 | ||
74 | seq_printf(m, "processor\t: %d\n", index); | |
75 | seq_printf(m, "vendor_id\t: User Mode Linux\n"); | |
76 | seq_printf(m, "model name\t: UML\n"); | |
6aa802ce | 77 | seq_printf(m, "mode\t\t: skas\n"); |
1da177e4 LT |
78 | seq_printf(m, "host\t\t: %s\n", host_info); |
79 | seq_printf(m, "bogomips\t: %lu.%02lu\n\n", | |
80 | loops_per_jiffy/(500000/HZ), | |
81 | (loops_per_jiffy/(5000/HZ)) % 100); | |
82 | ||
a5ed1ffa | 83 | return 0; |
1da177e4 LT |
84 | } |
85 | ||
86 | static void *c_start(struct seq_file *m, loff_t *pos) | |
87 | { | |
88 | return *pos < NR_CPUS ? cpu_data + *pos : NULL; | |
89 | } | |
90 | ||
91 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) | |
92 | { | |
93 | ++*pos; | |
94 | return c_start(m, pos); | |
95 | } | |
96 | ||
97 | static void c_stop(struct seq_file *m, void *v) | |
98 | { | |
99 | } | |
100 | ||
5e7672ec | 101 | const struct seq_operations cpuinfo_op = { |
1da177e4 LT |
102 | .start = c_start, |
103 | .next = c_next, | |
104 | .stop = c_stop, | |
105 | .show = show_cpuinfo, | |
106 | }; | |
107 | ||
1da177e4 | 108 | /* Set in linux_main */ |
1da177e4 | 109 | unsigned long uml_physmem; |
73395a00 AV |
110 | EXPORT_SYMBOL(uml_physmem); |
111 | ||
1d1497e1 | 112 | unsigned long uml_reserved; /* Also modified in mem_init */ |
1da177e4 LT |
113 | unsigned long start_vm; |
114 | unsigned long end_vm; | |
1d1497e1 JD |
115 | |
116 | /* Set in uml_ncpus_setup */ | |
1da177e4 LT |
117 | int ncpus = 1; |
118 | ||
1da177e4 LT |
119 | /* Set in early boot */ |
120 | static int have_root __initdata = 0; | |
1d1497e1 JD |
121 | |
122 | /* Set in uml_mem_setup and modified in linux_main */ | |
ae173816 | 123 | long long physmem_size = 32 * 1024 * 1024; |
1da177e4 | 124 | |
3af9c5be | 125 | static const char *usage_string = |
1da177e4 LT |
126 | "User Mode Linux v%s\n" |
127 | " available at http://user-mode-linux.sourceforge.net/\n\n"; | |
128 | ||
129 | static int __init uml_version_setup(char *line, int *add) | |
130 | { | |
96b644bd | 131 | printf("%s\n", init_utsname()->release); |
1da177e4 LT |
132 | exit(0); |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | __uml_setup("--version", uml_version_setup, | |
138 | "--version\n" | |
139 | " Prints the version number of the kernel.\n\n" | |
140 | ); | |
141 | ||
142 | static int __init uml_root_setup(char *line, int *add) | |
143 | { | |
144 | have_root = 1; | |
145 | return 0; | |
146 | } | |
147 | ||
148 | __uml_setup("root=", uml_root_setup, | |
149 | "root=<file containing the root fs>\n" | |
150 | " This is actually used by the generic kernel in exactly the same\n" | |
151 | " way as in any other kernel. If you configure a number of block\n" | |
152 | " devices and want to boot off something other than ubd0, you \n" | |
153 | " would use something like:\n" | |
154 | " root=/dev/ubd5\n\n" | |
155 | ); | |
156 | ||
fbd55779 JD |
157 | static int __init no_skas_debug_setup(char *line, int *add) |
158 | { | |
159 | printf("'debug' is not necessary to gdb UML in skas mode - run \n"); | |
96cee304 | 160 | printf("'gdb linux'\n"); |
fbd55779 JD |
161 | |
162 | return 0; | |
163 | } | |
164 | ||
165 | __uml_setup("debug", no_skas_debug_setup, | |
166 | "debug\n" | |
167 | " this flag is not needed to run gdb on UML in skas mode\n\n" | |
168 | ); | |
169 | ||
1da177e4 LT |
170 | #ifdef CONFIG_SMP |
171 | static int __init uml_ncpus_setup(char *line, int *add) | |
172 | { | |
a5ed1ffa JD |
173 | if (!sscanf(line, "%d", &ncpus)) { |
174 | printf("Couldn't parse [%s]\n", line); | |
175 | return -1; | |
176 | } | |
1da177e4 | 177 | |
a5ed1ffa | 178 | return 0; |
1da177e4 LT |
179 | } |
180 | ||
181 | __uml_setup("ncpus=", uml_ncpus_setup, | |
182 | "ncpus=<# of desired CPUs>\n" | |
ba180fd4 | 183 | " This tells an SMP kernel how many virtual processors to start.\n\n" |
1da177e4 LT |
184 | ); |
185 | #endif | |
186 | ||
1da177e4 LT |
187 | static int __init Usage(char *line, int *add) |
188 | { | |
a5ed1ffa | 189 | const char **p; |
1da177e4 | 190 | |
96b644bd | 191 | printf(usage_string, init_utsname()->release); |
a5ed1ffa JD |
192 | p = &__uml_help_start; |
193 | while (p < &__uml_help_end) { | |
194 | printf("%s", *p); | |
195 | p++; | |
196 | } | |
1da177e4 | 197 | exit(0); |
1da177e4 LT |
198 | return 0; |
199 | } | |
200 | ||
201 | __uml_setup("--help", Usage, | |
202 | "--help\n" | |
203 | " Prints this message.\n\n" | |
204 | ); | |
205 | ||
6b7e9674 | 206 | static void __init uml_checksetup(char *line, int *add) |
1da177e4 LT |
207 | { |
208 | struct uml_param *p; | |
209 | ||
210 | p = &__uml_setup_start; | |
c5d4bb17 | 211 | while (p < &__uml_setup_end) { |
3af9c5be | 212 | size_t n; |
1da177e4 LT |
213 | |
214 | n = strlen(p->str); | |
ba180fd4 | 215 | if (!strncmp(line, p->str, n) && p->setup_func(line + n, add)) |
6b7e9674 | 216 | return; |
1da177e4 LT |
217 | p++; |
218 | } | |
1da177e4 LT |
219 | } |
220 | ||
221 | static void __init uml_postsetup(void) | |
222 | { | |
223 | initcall_t *p; | |
224 | ||
225 | p = &__uml_postsetup_start; | |
c5d4bb17 | 226 | while (p < &__uml_postsetup_end) { |
1da177e4 LT |
227 | (*p)(); |
228 | p++; | |
229 | } | |
230 | return; | |
231 | } | |
232 | ||
0983a88b JD |
233 | static int panic_exit(struct notifier_block *self, unsigned long unused1, |
234 | void *unused2) | |
235 | { | |
236 | bust_spinlocks(1); | |
237 | show_regs(&(current->thread.regs)); | |
238 | bust_spinlocks(0); | |
239 | uml_exitcode = 1; | |
240 | os_dump_core(); | |
241 | return 0; | |
242 | } | |
243 | ||
244 | static struct notifier_block panic_exit_notifier = { | |
245 | .notifier_call = panic_exit, | |
246 | .next = NULL, | |
247 | .priority = 0 | |
248 | }; | |
249 | ||
1da177e4 | 250 | /* Set during early boot */ |
536788fe JD |
251 | unsigned long task_size; |
252 | EXPORT_SYMBOL(task_size); | |
253 | ||
254 | unsigned long host_task_size; | |
255 | ||
1da177e4 LT |
256 | unsigned long brk_start; |
257 | unsigned long end_iomem; | |
258 | EXPORT_SYMBOL(end_iomem); | |
259 | ||
260 | #define MIN_VMALLOC (32 * 1024 * 1024) | |
261 | ||
23bbd586 JD |
262 | extern char __binary_start; |
263 | ||
7a3a06d0 | 264 | int __init linux_main(int argc, char **argv) |
1da177e4 LT |
265 | { |
266 | unsigned long avail, diff; | |
267 | unsigned long virtmem_size, max_physmem; | |
60a2988a | 268 | unsigned long stack; |
3af9c5be WC |
269 | unsigned int i; |
270 | int add; | |
cb66504d | 271 | char * mode; |
1da177e4 | 272 | |
ba180fd4 JD |
273 | for (i = 1; i < argc; i++) { |
274 | if ((i == 1) && (argv[i][0] == ' ')) | |
275 | continue; | |
1da177e4 LT |
276 | add = 1; |
277 | uml_checksetup(argv[i], &add); | |
278 | if (add) | |
279 | add_arg(argv[i]); | |
280 | } | |
ba180fd4 | 281 | if (have_root == 0) |
1da177e4 LT |
282 | add_arg(DEFAULT_COMMAND_LINE); |
283 | ||
40fb16a3 | 284 | host_task_size = os_get_top_address(); |
536788fe JD |
285 | /* |
286 | * TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps | |
287 | * out | |
288 | */ | |
289 | task_size = host_task_size & PGDIR_MASK; | |
290 | ||
ba180fd4 | 291 | /* OS sanity checks that need to happen before the kernel runs */ |
60d339f6 | 292 | os_early_checks(); |
cb66504d | 293 | |
42fda663 JD |
294 | can_do_skas(); |
295 | ||
296 | if (proc_mm && ptrace_faultinfo) | |
cb66504d PBG |
297 | mode = "SKAS3"; |
298 | else | |
299 | mode = "SKAS0"; | |
cb66504d PBG |
300 | |
301 | printf("UML running in %s mode\n", mode); | |
302 | ||
1da177e4 | 303 | brk_start = (unsigned long) sbrk(0); |
77bf4400 | 304 | |
ba180fd4 JD |
305 | /* |
306 | * Increase physical memory size for exec-shield users | |
307 | * so they actually get what they asked for. This should | |
308 | * add zero for non-exec shield users | |
309 | */ | |
1da177e4 LT |
310 | |
311 | diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); | |
ba180fd4 | 312 | if (diff > 1024 * 1024) { |
1da177e4 LT |
313 | printf("Adding %ld bytes to physical memory to account for " |
314 | "exec-shield gap\n", diff); | |
315 | physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); | |
316 | } | |
317 | ||
1d1497e1 | 318 | uml_physmem = (unsigned long) &__binary_start & PAGE_MASK; |
1da177e4 LT |
319 | |
320 | /* Reserve up to 4M after the current brk */ | |
321 | uml_reserved = ROUND_4M(brk_start) + (1 << 22); | |
322 | ||
96b644bd | 323 | setup_machinename(init_utsname()->machine); |
1da177e4 | 324 | |
1da177e4 LT |
325 | highmem = 0; |
326 | iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK; | |
536788fe | 327 | max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC; |
1da177e4 | 328 | |
ba180fd4 JD |
329 | /* |
330 | * Zones have to begin on a 1 << MAX_ORDER page boundary, | |
1da177e4 LT |
331 | * so this makes sure that's true for highmem |
332 | */ | |
333 | max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1); | |
ba180fd4 | 334 | if (physmem_size + iomem_size > max_physmem) { |
1da177e4 LT |
335 | highmem = physmem_size + iomem_size - max_physmem; |
336 | physmem_size -= highmem; | |
337 | #ifndef CONFIG_HIGHMEM | |
338 | highmem = 0; | |
339 | printf("CONFIG_HIGHMEM not enabled - physical memory shrunk " | |
d9f8b62a | 340 | "to %Lu bytes\n", physmem_size); |
1da177e4 LT |
341 | #endif |
342 | } | |
343 | ||
344 | high_physmem = uml_physmem + physmem_size; | |
345 | end_iomem = high_physmem + iomem_size; | |
346 | high_memory = (void *) end_iomem; | |
347 | ||
348 | start_vm = VMALLOC_START; | |
349 | ||
350 | setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem); | |
ba180fd4 | 351 | if (init_maps(physmem_size, iomem_size, highmem)) { |
d9f8b62a JD |
352 | printf("Failed to allocate mem_map for %Lu bytes of physical " |
353 | "memory and %Lu bytes of highmem\n", physmem_size, | |
1da177e4 LT |
354 | highmem); |
355 | exit(1); | |
356 | } | |
357 | ||
358 | virtmem_size = physmem_size; | |
60a2988a JD |
359 | stack = (unsigned long) argv; |
360 | stack &= ~(1024 * 1024 - 1); | |
361 | avail = stack - start_vm; | |
ba180fd4 JD |
362 | if (physmem_size > avail) |
363 | virtmem_size = avail; | |
1da177e4 LT |
364 | end_vm = start_vm + virtmem_size; |
365 | ||
ba180fd4 | 366 | if (virtmem_size < physmem_size) |
ae173816 | 367 | printf("Kernel virtual memory size shrunk to %lu bytes\n", |
1da177e4 LT |
368 | virtmem_size); |
369 | ||
0983a88b JD |
370 | atomic_notifier_chain_register(&panic_notifier_list, |
371 | &panic_exit_notifier); | |
372 | ||
a5ed1ffa | 373 | uml_postsetup(); |
1da177e4 | 374 | |
57598fd7 | 375 | stack_protections((unsigned long) &init_thread_info); |
1da177e4 LT |
376 | os_flush_stdout(); |
377 | ||
77bf4400 | 378 | return start_uml(); |
1da177e4 LT |
379 | } |
380 | ||
1da177e4 LT |
381 | void __init setup_arch(char **cmdline_p) |
382 | { | |
1da177e4 | 383 | paging_init(); |
19bf7e7a | 384 | strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); |
a5ed1ffa | 385 | *cmdline_p = command_line; |
b4ffb6ad | 386 | setup_hostinfo(host_info, sizeof host_info); |
1da177e4 LT |
387 | } |
388 | ||
389 | void __init check_bugs(void) | |
390 | { | |
391 | arch_check_bugs(); | |
a5ed1ffa | 392 | os_check_bugs(); |
1da177e4 LT |
393 | } |
394 | ||
9a0b5817 GH |
395 | void apply_alternatives(struct alt_instr *start, struct alt_instr *end) |
396 | { | |
397 | } | |
398 | ||
c61a8416 | 399 | #ifdef CONFIG_SMP |
9a0b5817 GH |
400 | void alternatives_smp_module_add(struct module *mod, char *name, |
401 | void *locks, void *locks_end, | |
402 | void *text, void *text_end) | |
403 | { | |
404 | } | |
405 | ||
406 | void alternatives_smp_module_del(struct module *mod) | |
1da177e4 LT |
407 | { |
408 | } | |
c61a8416 | 409 | #endif |