This source file includes following definitions.
- add_arg
- show_cpuinfo
- c_start
- c_next
- c_stop
- uml_version_setup
- uml_root_setup
- no_skas_debug_setup
- Usage
- uml_checksetup
- uml_postsetup
- panic_exit
- uml_finishsetup
- linux_main
- read_initrd
- setup_arch
- check_bugs
- apply_alternatives
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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>
13 #include <linux/sched.h>
14 #include <linux/sched/task.h>
15 #include <linux/kmsg_dump.h>
16
17 #include <asm/pgtable.h>
18 #include <asm/processor.h>
19 #include <asm/sections.h>
20 #include <asm/setup.h>
21 #include <as-layout.h>
22 #include <arch.h>
23 #include <init.h>
24 #include <kern.h>
25 #include <kern_util.h>
26 #include <mem_user.h>
27 #include <os.h>
28
29 #define DEFAULT_COMMAND_LINE "root=98:0"
30
31
32 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
33
34 static void __init add_arg(char *arg)
35 {
36 if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
37 os_warn("add_arg: Too many command line arguments!\n");
38 exit(1);
39 }
40 if (strlen(command_line) > 0)
41 strcat(command_line, " ");
42 strcat(command_line, arg);
43 }
44
45
46
47
48
49
50 struct cpuinfo_um boot_cpu_data = {
51 .loops_per_jiffy = 0,
52 .ipi_pipe = { -1, -1 }
53 };
54
55 union thread_union cpu0_irqstack
56 __attribute__((__section__(".data..init_irqstack"))) =
57 { .thread_info = INIT_THREAD_INFO(init_task) };
58
59
60 static char host_info[(__NEW_UTS_LEN + 1) * 5];
61
62 static int show_cpuinfo(struct seq_file *m, void *v)
63 {
64 int index = 0;
65
66 seq_printf(m, "processor\t: %d\n", index);
67 seq_printf(m, "vendor_id\t: User Mode Linux\n");
68 seq_printf(m, "model name\t: UML\n");
69 seq_printf(m, "mode\t\t: skas\n");
70 seq_printf(m, "host\t\t: %s\n", host_info);
71 seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
72 loops_per_jiffy/(500000/HZ),
73 (loops_per_jiffy/(5000/HZ)) % 100);
74
75 return 0;
76 }
77
78 static void *c_start(struct seq_file *m, loff_t *pos)
79 {
80 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
81 }
82
83 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
84 {
85 ++*pos;
86 return c_start(m, pos);
87 }
88
89 static void c_stop(struct seq_file *m, void *v)
90 {
91 }
92
93 const struct seq_operations cpuinfo_op = {
94 .start = c_start,
95 .next = c_next,
96 .stop = c_stop,
97 .show = show_cpuinfo,
98 };
99
100
101 unsigned long uml_physmem;
102 EXPORT_SYMBOL(uml_physmem);
103
104 unsigned long uml_reserved;
105 unsigned long start_vm;
106 unsigned long end_vm;
107
108
109 int ncpus = 1;
110
111
112 static int have_root __initdata = 0;
113
114
115 long long physmem_size = 32 * 1024 * 1024;
116 EXPORT_SYMBOL(physmem_size);
117
118 static const char *usage_string =
119 "User Mode Linux v%s\n"
120 " available at http://user-mode-linux.sourceforge.net/\n\n";
121
122 static int __init uml_version_setup(char *line, int *add)
123 {
124
125 printf("%s\n", init_utsname()->release);
126 exit(0);
127
128 return 0;
129 }
130
131 __uml_setup("--version", uml_version_setup,
132 "--version\n"
133 " Prints the version number of the kernel.\n\n"
134 );
135
136 static int __init uml_root_setup(char *line, int *add)
137 {
138 have_root = 1;
139 return 0;
140 }
141
142 __uml_setup("root=", uml_root_setup,
143 "root=<file containing the root fs>\n"
144 " This is actually used by the generic kernel in exactly the same\n"
145 " way as in any other kernel. If you configure a number of block\n"
146 " devices and want to boot off something other than ubd0, you \n"
147 " would use something like:\n"
148 " root=/dev/ubd5\n\n"
149 );
150
151 static int __init no_skas_debug_setup(char *line, int *add)
152 {
153 os_warn("'debug' is not necessary to gdb UML in skas mode - run\n");
154 os_warn("'gdb linux'\n");
155
156 return 0;
157 }
158
159 __uml_setup("debug", no_skas_debug_setup,
160 "debug\n"
161 " this flag is not needed to run gdb on UML in skas mode\n\n"
162 );
163
164 static int __init Usage(char *line, int *add)
165 {
166 const char **p;
167
168 printf(usage_string, init_utsname()->release);
169 p = &__uml_help_start;
170
171 while (p < &__uml_help_end) {
172 printf("%s", *p);
173 p++;
174 }
175 exit(0);
176 return 0;
177 }
178
179 __uml_setup("--help", Usage,
180 "--help\n"
181 " Prints this message.\n\n"
182 );
183
184 static void __init uml_checksetup(char *line, int *add)
185 {
186 struct uml_param *p;
187
188 p = &__uml_setup_start;
189 while (p < &__uml_setup_end) {
190 size_t n;
191
192 n = strlen(p->str);
193 if (!strncmp(line, p->str, n) && p->setup_func(line + n, add))
194 return;
195 p++;
196 }
197 }
198
199 static void __init uml_postsetup(void)
200 {
201 initcall_t *p;
202
203 p = &__uml_postsetup_start;
204 while (p < &__uml_postsetup_end) {
205 (*p)();
206 p++;
207 }
208 return;
209 }
210
211 static int panic_exit(struct notifier_block *self, unsigned long unused1,
212 void *unused2)
213 {
214 kmsg_dump(KMSG_DUMP_PANIC);
215 bust_spinlocks(1);
216 bust_spinlocks(0);
217 uml_exitcode = 1;
218 os_dump_core();
219 return 0;
220 }
221
222 static struct notifier_block panic_exit_notifier = {
223 .notifier_call = panic_exit,
224 .next = NULL,
225 .priority = 0
226 };
227
228 void uml_finishsetup(void)
229 {
230 atomic_notifier_chain_register(&panic_notifier_list,
231 &panic_exit_notifier);
232
233 uml_postsetup();
234
235 new_thread_handler();
236 }
237
238
239 unsigned long task_size;
240 EXPORT_SYMBOL(task_size);
241
242 unsigned long host_task_size;
243
244 unsigned long brk_start;
245 unsigned long end_iomem;
246 EXPORT_SYMBOL(end_iomem);
247
248 #define MIN_VMALLOC (32 * 1024 * 1024)
249
250 int __init linux_main(int argc, char **argv)
251 {
252 unsigned long avail, diff;
253 unsigned long virtmem_size, max_physmem;
254 unsigned long stack;
255 unsigned int i;
256 int add;
257
258 for (i = 1; i < argc; i++) {
259 if ((i == 1) && (argv[i][0] == ' '))
260 continue;
261 add = 1;
262 uml_checksetup(argv[i], &add);
263 if (add)
264 add_arg(argv[i]);
265 }
266 if (have_root == 0)
267 add_arg(DEFAULT_COMMAND_LINE);
268
269 host_task_size = os_get_top_address();
270
271
272
273
274 task_size = host_task_size & PGDIR_MASK;
275
276
277 os_early_checks();
278
279 brk_start = (unsigned long) sbrk(0);
280
281
282
283
284
285
286
287 diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
288 if (diff > 1024 * 1024) {
289 os_info("Adding %ld bytes to physical memory to account for "
290 "exec-shield gap\n", diff);
291 physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
292 }
293
294 uml_physmem = (unsigned long) __binary_start & PAGE_MASK;
295
296
297 uml_reserved = ROUND_4M(brk_start) + (1 << 22);
298
299 setup_machinename(init_utsname()->machine);
300
301 highmem = 0;
302 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
303 max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
304
305
306
307
308
309 max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
310 if (physmem_size + iomem_size > max_physmem) {
311 highmem = physmem_size + iomem_size - max_physmem;
312 physmem_size -= highmem;
313 }
314
315 high_physmem = uml_physmem + physmem_size;
316 end_iomem = high_physmem + iomem_size;
317 high_memory = (void *) end_iomem;
318
319 start_vm = VMALLOC_START;
320
321 virtmem_size = physmem_size;
322 stack = (unsigned long) argv;
323 stack &= ~(1024 * 1024 - 1);
324 avail = stack - start_vm;
325 if (physmem_size > avail)
326 virtmem_size = avail;
327 end_vm = start_vm + virtmem_size;
328
329 if (virtmem_size < physmem_size)
330 os_info("Kernel virtual memory size shrunk to %lu bytes\n",
331 virtmem_size);
332
333 os_flush_stdout();
334
335 return start_uml();
336 }
337
338 int __init __weak read_initrd(void)
339 {
340 return 0;
341 }
342
343 void __init setup_arch(char **cmdline_p)
344 {
345 stack_protections((unsigned long) &init_thread_info);
346 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
347 mem_total_pages(physmem_size, iomem_size, highmem);
348 read_initrd();
349
350 paging_init();
351 strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
352 *cmdline_p = command_line;
353 setup_hostinfo(host_info, sizeof host_info);
354 }
355
356 void __init check_bugs(void)
357 {
358 arch_check_bugs();
359 os_check_bugs();
360 }
361
362 void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
363 {
364 }