Commit | Line | Data |
---|---|---|
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> |
04a41849 | 14 | #include <linux/kmsg_dump.h> |
c5d4bb17 JD |
15 | #include <asm/pgtable.h> |
16 | #include <asm/processor.h> | |
33a7d429 | 17 | #include <asm/sections.h> |
c5d4bb17 | 18 | #include <asm/setup.h> |
37185b33 AV |
19 | #include <as-layout.h> |
20 | #include <arch.h> | |
21 | #include <init.h> | |
22 | #include <kern.h> | |
23 | #include <kern_util.h> | |
24 | #include <mem_user.h> | |
25 | #include <os.h> | |
1da177e4 LT |
26 | |
27 | #define DEFAULT_COMMAND_LINE "root=98:0" | |
28 | ||
1d1497e1 | 29 | /* Changed in add_arg and setup_arch, which run before SMP is started */ |
7a3a06d0 | 30 | static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 }; |
1da177e4 | 31 | |
7a3a06d0 | 32 | static void __init add_arg(char *arg) |
1da177e4 LT |
33 | { |
34 | if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) { | |
35 | printf("add_arg: Too many command line arguments!\n"); | |
36 | exit(1); | |
37 | } | |
ba180fd4 | 38 | if (strlen(command_line) > 0) |
1da177e4 LT |
39 | strcat(command_line, " "); |
40 | strcat(command_line, arg); | |
41 | } | |
42 | ||
1d1497e1 JD |
43 | /* |
44 | * These fields are initialized at boot time and not changed. | |
45 | * XXX This structure is used only in the non-SMP case. Maybe this | |
46 | * should be moved to smp.c. | |
47 | */ | |
48 | struct cpuinfo_um boot_cpu_data = { | |
1da177e4 LT |
49 | .loops_per_jiffy = 0, |
50 | .ipi_pipe = { -1, -1 } | |
51 | }; | |
52 | ||
5b408241 TG |
53 | union thread_union cpu0_irqstack |
54 | __attribute__((__section__(".data..init_irqstack"))) = | |
55 | { INIT_THREAD_INFO(init_task) }; | |
56 | ||
1da177e4 LT |
57 | unsigned long thread_saved_pc(struct task_struct *task) |
58 | { | |
77bf4400 JD |
59 | /* FIXME: Need to look up userspace_pid by cpu */ |
60 | return os_process_pc(userspace_pid[0]); | |
1da177e4 LT |
61 | } |
62 | ||
b4ffb6ad JD |
63 | /* Changed in setup_arch, which is called in early boot */ |
64 | static char host_info[(__NEW_UTS_LEN + 1) * 5]; | |
65 | ||
1da177e4 LT |
66 | static int show_cpuinfo(struct seq_file *m, void *v) |
67 | { | |
68 | int index = 0; | |
69 | ||
1da177e4 LT |
70 | seq_printf(m, "processor\t: %d\n", index); |
71 | seq_printf(m, "vendor_id\t: User Mode Linux\n"); | |
72 | seq_printf(m, "model name\t: UML\n"); | |
6aa802ce | 73 | seq_printf(m, "mode\t\t: skas\n"); |
1da177e4 LT |
74 | seq_printf(m, "host\t\t: %s\n", host_info); |
75 | seq_printf(m, "bogomips\t: %lu.%02lu\n\n", | |
76 | loops_per_jiffy/(500000/HZ), | |
77 | (loops_per_jiffy/(5000/HZ)) % 100); | |
78 | ||
a5ed1ffa | 79 | return 0; |
1da177e4 LT |
80 | } |
81 | ||
82 | static void *c_start(struct seq_file *m, loff_t *pos) | |
83 | { | |
84 | return *pos < NR_CPUS ? cpu_data + *pos : NULL; | |
85 | } | |
86 | ||
87 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) | |
88 | { | |
89 | ++*pos; | |
90 | return c_start(m, pos); | |
91 | } | |
92 | ||
93 | static void c_stop(struct seq_file *m, void *v) | |
94 | { | |
95 | } | |
96 | ||
5e7672ec | 97 | const struct seq_operations cpuinfo_op = { |
1da177e4 LT |
98 | .start = c_start, |
99 | .next = c_next, | |
100 | .stop = c_stop, | |
101 | .show = show_cpuinfo, | |
102 | }; | |
103 | ||
1da177e4 | 104 | /* Set in linux_main */ |
1da177e4 | 105 | unsigned long uml_physmem; |
73395a00 AV |
106 | EXPORT_SYMBOL(uml_physmem); |
107 | ||
1d1497e1 | 108 | unsigned long uml_reserved; /* Also modified in mem_init */ |
1da177e4 LT |
109 | unsigned long start_vm; |
110 | unsigned long end_vm; | |
1d1497e1 JD |
111 | |
112 | /* Set in uml_ncpus_setup */ | |
1da177e4 LT |
113 | int ncpus = 1; |
114 | ||
1da177e4 LT |
115 | /* Set in early boot */ |
116 | static int have_root __initdata = 0; | |
1d1497e1 JD |
117 | |
118 | /* Set in uml_mem_setup and modified in linux_main */ | |
ae173816 | 119 | long long physmem_size = 32 * 1024 * 1024; |
1da177e4 | 120 | |
3af9c5be | 121 | static const char *usage_string = |
1da177e4 LT |
122 | "User Mode Linux v%s\n" |
123 | " available at http://user-mode-linux.sourceforge.net/\n\n"; | |
124 | ||
125 | static int __init uml_version_setup(char *line, int *add) | |
126 | { | |
96b644bd | 127 | printf("%s\n", init_utsname()->release); |
1da177e4 LT |
128 | exit(0); |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
133 | __uml_setup("--version", uml_version_setup, | |
134 | "--version\n" | |
135 | " Prints the version number of the kernel.\n\n" | |
136 | ); | |
137 | ||
138 | static int __init uml_root_setup(char *line, int *add) | |
139 | { | |
140 | have_root = 1; | |
141 | return 0; | |
142 | } | |
143 | ||
144 | __uml_setup("root=", uml_root_setup, | |
145 | "root=<file containing the root fs>\n" | |
146 | " This is actually used by the generic kernel in exactly the same\n" | |
147 | " way as in any other kernel. If you configure a number of block\n" | |
148 | " devices and want to boot off something other than ubd0, you \n" | |
149 | " would use something like:\n" | |
150 | " root=/dev/ubd5\n\n" | |
151 | ); | |
152 | ||
fbd55779 JD |
153 | static int __init no_skas_debug_setup(char *line, int *add) |
154 | { | |
155 | printf("'debug' is not necessary to gdb UML in skas mode - run \n"); | |
96cee304 | 156 | printf("'gdb linux'\n"); |
fbd55779 JD |
157 | |
158 | return 0; | |
159 | } | |
160 | ||
161 | __uml_setup("debug", no_skas_debug_setup, | |
162 | "debug\n" | |
163 | " this flag is not needed to run gdb on UML in skas mode\n\n" | |
164 | ); | |
165 | ||
1da177e4 LT |
166 | static int __init Usage(char *line, int *add) |
167 | { | |
a5ed1ffa | 168 | const char **p; |
1da177e4 | 169 | |
96b644bd | 170 | printf(usage_string, init_utsname()->release); |
a5ed1ffa JD |
171 | p = &__uml_help_start; |
172 | while (p < &__uml_help_end) { | |
173 | printf("%s", *p); | |
174 | p++; | |
175 | } | |
1da177e4 | 176 | exit(0); |
1da177e4 LT |
177 | return 0; |
178 | } | |
179 | ||
180 | __uml_setup("--help", Usage, | |
181 | "--help\n" | |
182 | " Prints this message.\n\n" | |
183 | ); | |
184 | ||
6b7e9674 | 185 | static void __init uml_checksetup(char *line, int *add) |
1da177e4 LT |
186 | { |
187 | struct uml_param *p; | |
188 | ||
189 | p = &__uml_setup_start; | |
c5d4bb17 | 190 | while (p < &__uml_setup_end) { |
3af9c5be | 191 | size_t n; |
1da177e4 LT |
192 | |
193 | n = strlen(p->str); | |
ba180fd4 | 194 | if (!strncmp(line, p->str, n) && p->setup_func(line + n, add)) |
6b7e9674 | 195 | return; |
1da177e4 LT |
196 | p++; |
197 | } | |
1da177e4 LT |
198 | } |
199 | ||
200 | static void __init uml_postsetup(void) | |
201 | { | |
202 | initcall_t *p; | |
203 | ||
204 | p = &__uml_postsetup_start; | |
c5d4bb17 | 205 | while (p < &__uml_postsetup_end) { |
1da177e4 LT |
206 | (*p)(); |
207 | p++; | |
208 | } | |
209 | return; | |
210 | } | |
211 | ||
0983a88b JD |
212 | static int panic_exit(struct notifier_block *self, unsigned long unused1, |
213 | void *unused2) | |
214 | { | |
04a41849 | 215 | kmsg_dump(KMSG_DUMP_PANIC); |
0983a88b | 216 | bust_spinlocks(1); |
0983a88b JD |
217 | bust_spinlocks(0); |
218 | uml_exitcode = 1; | |
219 | os_dump_core(); | |
220 | return 0; | |
221 | } | |
222 | ||
223 | static struct notifier_block panic_exit_notifier = { | |
224 | .notifier_call = panic_exit, | |
225 | .next = NULL, | |
226 | .priority = 0 | |
227 | }; | |
228 | ||
33bbc306 TM |
229 | void uml_finishsetup(void) |
230 | { | |
231 | atomic_notifier_chain_register(&panic_notifier_list, | |
232 | &panic_exit_notifier); | |
233 | ||
234 | uml_postsetup(); | |
235 | ||
236 | new_thread_handler(); | |
237 | } | |
238 | ||
1da177e4 | 239 | /* Set during early boot */ |
536788fe JD |
240 | unsigned long task_size; |
241 | EXPORT_SYMBOL(task_size); | |
242 | ||
243 | unsigned long host_task_size; | |
244 | ||
1da177e4 LT |
245 | unsigned long brk_start; |
246 | unsigned long end_iomem; | |
247 | EXPORT_SYMBOL(end_iomem); | |
248 | ||
249 | #define MIN_VMALLOC (32 * 1024 * 1024) | |
250 | ||
7a3a06d0 | 251 | int __init linux_main(int argc, char **argv) |
1da177e4 LT |
252 | { |
253 | unsigned long avail, diff; | |
254 | unsigned long virtmem_size, max_physmem; | |
60a2988a | 255 | unsigned long stack; |
3af9c5be WC |
256 | unsigned int i; |
257 | int add; | |
1da177e4 | 258 | |
ba180fd4 JD |
259 | for (i = 1; i < argc; i++) { |
260 | if ((i == 1) && (argv[i][0] == ' ')) | |
261 | continue; | |
1da177e4 LT |
262 | add = 1; |
263 | uml_checksetup(argv[i], &add); | |
264 | if (add) | |
265 | add_arg(argv[i]); | |
266 | } | |
ba180fd4 | 267 | if (have_root == 0) |
1da177e4 LT |
268 | add_arg(DEFAULT_COMMAND_LINE); |
269 | ||
40fb16a3 | 270 | host_task_size = os_get_top_address(); |
536788fe JD |
271 | /* |
272 | * TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps | |
273 | * out | |
274 | */ | |
275 | task_size = host_task_size & PGDIR_MASK; | |
276 | ||
ba180fd4 | 277 | /* OS sanity checks that need to happen before the kernel runs */ |
60d339f6 | 278 | os_early_checks(); |
cb66504d | 279 | |
1da177e4 | 280 | brk_start = (unsigned long) sbrk(0); |
77bf4400 | 281 | |
ba180fd4 JD |
282 | /* |
283 | * Increase physical memory size for exec-shield users | |
284 | * so they actually get what they asked for. This should | |
285 | * add zero for non-exec shield users | |
286 | */ | |
1da177e4 LT |
287 | |
288 | diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); | |
ba180fd4 | 289 | if (diff > 1024 * 1024) { |
1da177e4 LT |
290 | printf("Adding %ld bytes to physical memory to account for " |
291 | "exec-shield gap\n", diff); | |
292 | physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); | |
293 | } | |
294 | ||
05eacfd0 | 295 | uml_physmem = (unsigned long) __binary_start & PAGE_MASK; |
1da177e4 LT |
296 | |
297 | /* Reserve up to 4M after the current brk */ | |
298 | uml_reserved = ROUND_4M(brk_start) + (1 << 22); | |
299 | ||
96b644bd | 300 | setup_machinename(init_utsname()->machine); |
1da177e4 | 301 | |
1da177e4 LT |
302 | highmem = 0; |
303 | iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK; | |
536788fe | 304 | max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC; |
1da177e4 | 305 | |
ba180fd4 JD |
306 | /* |
307 | * Zones have to begin on a 1 << MAX_ORDER page boundary, | |
1da177e4 LT |
308 | * so this makes sure that's true for highmem |
309 | */ | |
310 | max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1); | |
ba180fd4 | 311 | if (physmem_size + iomem_size > max_physmem) { |
1da177e4 LT |
312 | highmem = physmem_size + iomem_size - max_physmem; |
313 | physmem_size -= highmem; | |
1da177e4 LT |
314 | } |
315 | ||
316 | high_physmem = uml_physmem + physmem_size; | |
317 | end_iomem = high_physmem + iomem_size; | |
318 | high_memory = (void *) end_iomem; | |
319 | ||
320 | start_vm = VMALLOC_START; | |
321 | ||
322 | setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem); | |
9e6a57d2 | 323 | mem_total_pages(physmem_size, iomem_size, highmem); |
1da177e4 LT |
324 | |
325 | virtmem_size = physmem_size; | |
60a2988a JD |
326 | stack = (unsigned long) argv; |
327 | stack &= ~(1024 * 1024 - 1); | |
328 | avail = stack - start_vm; | |
ba180fd4 JD |
329 | if (physmem_size > avail) |
330 | virtmem_size = avail; | |
1da177e4 LT |
331 | end_vm = start_vm + virtmem_size; |
332 | ||
ba180fd4 | 333 | if (virtmem_size < physmem_size) |
ae173816 | 334 | printf("Kernel virtual memory size shrunk to %lu bytes\n", |
1da177e4 LT |
335 | virtmem_size); |
336 | ||
57598fd7 | 337 | stack_protections((unsigned long) &init_thread_info); |
1da177e4 LT |
338 | os_flush_stdout(); |
339 | ||
77bf4400 | 340 | return start_uml(); |
1da177e4 LT |
341 | } |
342 | ||
1da177e4 LT |
343 | void __init setup_arch(char **cmdline_p) |
344 | { | |
1da177e4 | 345 | paging_init(); |
19bf7e7a | 346 | strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); |
a5ed1ffa | 347 | *cmdline_p = command_line; |
b4ffb6ad | 348 | setup_hostinfo(host_info, sizeof host_info); |
1da177e4 LT |
349 | } |
350 | ||
351 | void __init check_bugs(void) | |
352 | { | |
353 | arch_check_bugs(); | |
a5ed1ffa | 354 | os_check_bugs(); |
1da177e4 LT |
355 | } |
356 | ||
9a0b5817 GH |
357 | void apply_alternatives(struct alt_instr *start, struct alt_instr *end) |
358 | { | |
359 | } |