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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#include <linux/suspend.h>
17
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 "root=98:0"
30#define DEFAULT_COMMAND_LINE_CONSOLE "console=tty"
31
32
33static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
34
35static void __init add_arg(char *arg)
36{
37 if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
38 os_warn("add_arg: Too many command line arguments!\n");
39 exit(1);
40 }
41 if (strlen(command_line) > 0)
42 strcat(command_line, " ");
43 strcat(command_line, arg);
44}
45
46
47
48
49
50
51struct cpuinfo_um boot_cpu_data = {
52 .loops_per_jiffy = 0,
53 .ipi_pipe = { -1, -1 }
54};
55
56union thread_union cpu0_irqstack
57 __section(".data..init_irqstack") =
58 { .thread_info = INIT_THREAD_INFO(init_task) };
59
60
61static char host_info[(__NEW_UTS_LEN + 1) * 5];
62
63static int show_cpuinfo(struct seq_file *m, void *v)
64{
65 int index = 0;
66
67 seq_printf(m, "processor\t: %d\n", index);
68 seq_printf(m, "vendor_id\t: User Mode Linux\n");
69 seq_printf(m, "model name\t: UML\n");
70 seq_printf(m, "mode\t\t: skas\n");
71 seq_printf(m, "host\t\t: %s\n", host_info);
72 seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
73 loops_per_jiffy/(500000/HZ),
74 (loops_per_jiffy/(5000/HZ)) % 100);
75
76 return 0;
77}
78
79static void *c_start(struct seq_file *m, loff_t *pos)
80{
81 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
82}
83
84static void *c_next(struct seq_file *m, void *v, loff_t *pos)
85{
86 ++*pos;
87 return c_start(m, pos);
88}
89
90static void c_stop(struct seq_file *m, void *v)
91{
92}
93
94const struct seq_operations cpuinfo_op = {
95 .start = c_start,
96 .next = c_next,
97 .stop = c_stop,
98 .show = show_cpuinfo,
99};
100
101
102unsigned long uml_physmem;
103EXPORT_SYMBOL(uml_physmem);
104
105unsigned long uml_reserved;
106unsigned long start_vm;
107unsigned long end_vm;
108
109
110int ncpus = 1;
111
112
113static int have_root __initdata;
114static int have_console __initdata;
115
116
117long long physmem_size = 32 * 1024 * 1024;
118EXPORT_SYMBOL(physmem_size);
119
120static const char *usage_string =
121"User Mode Linux v%s\n"
122" available at http://user-mode-linux.sourceforge.net/\n\n";
123
124static int __init uml_version_setup(char *line, int *add)
125{
126
127 printf("%s\n", init_utsname()->release);
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
138static 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
153static int __init no_skas_debug_setup(char *line, int *add)
154{
155 os_warn("'debug' is not necessary to gdb UML in skas mode - run\n");
156 os_warn("'gdb linux'\n");
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
166static int __init uml_console_setup(char *line, int *add)
167{
168 have_console = 1;
169 return 0;
170}
171
172__uml_setup("console=", uml_console_setup,
173"console=<preferred console>\n"
174" Specify the preferred console output driver\n\n"
175);
176
177static int __init Usage(char *line, int *add)
178{
179 const char **p;
180
181 printf(usage_string, init_utsname()->release);
182 p = &__uml_help_start;
183
184 while (p < &__uml_help_end) {
185 printf("%s", *p);
186 p++;
187 }
188 exit(0);
189 return 0;
190}
191
192__uml_setup("--help", Usage,
193"--help\n"
194" Prints this message.\n\n"
195);
196
197static void __init uml_checksetup(char *line, int *add)
198{
199 struct uml_param *p;
200
201 p = &__uml_setup_start;
202 while (p < &__uml_setup_end) {
203 size_t n;
204
205 n = strlen(p->str);
206 if (!strncmp(line, p->str, n) && p->setup_func(line + n, add))
207 return;
208 p++;
209 }
210}
211
212static void __init uml_postsetup(void)
213{
214 initcall_t *p;
215
216 p = &__uml_postsetup_start;
217 while (p < &__uml_postsetup_end) {
218 (*p)();
219 p++;
220 }
221 return;
222}
223
224static int panic_exit(struct notifier_block *self, unsigned long unused1,
225 void *unused2)
226{
227 kmsg_dump(KMSG_DUMP_PANIC);
228 bust_spinlocks(1);
229 bust_spinlocks(0);
230 uml_exitcode = 1;
231 os_dump_core();
232 return 0;
233}
234
235static struct notifier_block panic_exit_notifier = {
236 .notifier_call = panic_exit,
237 .next = NULL,
238 .priority = 0
239};
240
241void uml_finishsetup(void)
242{
243 atomic_notifier_chain_register(&panic_notifier_list,
244 &panic_exit_notifier);
245
246 uml_postsetup();
247
248 new_thread_handler();
249}
250
251
252unsigned long task_size;
253EXPORT_SYMBOL(task_size);
254
255unsigned long host_task_size;
256
257unsigned long brk_start;
258unsigned long end_iomem;
259EXPORT_SYMBOL(end_iomem);
260
261#define MIN_VMALLOC (32 * 1024 * 1024)
262
263int __init linux_main(int argc, char **argv)
264{
265 unsigned long avail, diff;
266 unsigned long virtmem_size, max_physmem;
267 unsigned long stack;
268 unsigned int i;
269 int add;
270
271 for (i = 1; i < argc; i++) {
272 if ((i == 1) && (argv[i][0] == ' '))
273 continue;
274 add = 1;
275 uml_checksetup(argv[i], &add);
276 if (add)
277 add_arg(argv[i]);
278 }
279 if (have_root == 0)
280 add_arg(DEFAULT_COMMAND_LINE_ROOT);
281
282 if (have_console == 0)
283 add_arg(DEFAULT_COMMAND_LINE_CONSOLE);
284
285 host_task_size = os_get_top_address();
286
287
288
289
290 task_size = host_task_size & PGDIR_MASK;
291
292
293 os_early_checks();
294
295 brk_start = (unsigned long) sbrk(0);
296
297
298
299
300
301
302
303 diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
304 if (diff > 1024 * 1024) {
305 os_info("Adding %ld bytes to physical memory to account for "
306 "exec-shield gap\n", diff);
307 physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
308 }
309
310 uml_physmem = (unsigned long) __binary_start & PAGE_MASK;
311
312
313 uml_reserved = ROUND_4M(brk_start) + (1 << 22);
314
315 setup_machinename(init_utsname()->machine);
316
317 highmem = 0;
318 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
319 max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
320
321
322
323
324
325 max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
326 if (physmem_size + iomem_size > max_physmem) {
327 highmem = physmem_size + iomem_size - max_physmem;
328 physmem_size -= highmem;
329 }
330
331 high_physmem = uml_physmem + physmem_size;
332 end_iomem = high_physmem + iomem_size;
333 high_memory = (void *) end_iomem;
334
335 start_vm = VMALLOC_START;
336
337 virtmem_size = physmem_size;
338 stack = (unsigned long) argv;
339 stack &= ~(1024 * 1024 - 1);
340 avail = stack - start_vm;
341 if (physmem_size > avail)
342 virtmem_size = avail;
343 end_vm = start_vm + virtmem_size;
344
345 if (virtmem_size < physmem_size)
346 os_info("Kernel virtual memory size shrunk to %lu bytes\n",
347 virtmem_size);
348
349 os_flush_stdout();
350
351 return start_uml();
352}
353
354int __init __weak read_initrd(void)
355{
356 return 0;
357}
358
359void __init setup_arch(char **cmdline_p)
360{
361 stack_protections((unsigned long) &init_thread_info);
362 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
363 mem_total_pages(physmem_size, iomem_size, highmem);
364 read_initrd();
365
366 paging_init();
367 strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
368 *cmdline_p = command_line;
369 setup_hostinfo(host_info, sizeof host_info);
370}
371
372void __init check_bugs(void)
373{
374 arch_check_bugs();
375 os_check_bugs();
376}
377
378void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
379{
380}
381
382void *text_poke(void *addr, const void *opcode, size_t len)
383{
384
385
386
387
388
389 WARN_ON(1);
390
391 return memcpy(addr, opcode, len);
392}
393
394void text_poke_sync(void)
395{
396}
397
398void uml_pm_wake(void)
399{
400 pm_system_wakeup();
401}
402
403#ifdef CONFIG_PM_SLEEP
404static int um_suspend_valid(suspend_state_t state)
405{
406 return state == PM_SUSPEND_MEM;
407}
408
409static int um_suspend_prepare(void)
410{
411 um_irqs_suspend();
412 return 0;
413}
414
415static int um_suspend_enter(suspend_state_t state)
416{
417 if (WARN_ON(state != PM_SUSPEND_MEM))
418 return -EINVAL;
419
420
421
422
423
424
425
426
427 um_idle_sleep();
428 return 0;
429}
430
431static void um_suspend_finish(void)
432{
433 um_irqs_resume();
434}
435
436const struct platform_suspend_ops um_suspend_ops = {
437 .valid = um_suspend_valid,
438 .prepare = um_suspend_prepare,
439 .enter = um_suspend_enter,
440 .finish = um_suspend_finish,
441};
442
443static int init_pm_wake_signal(void)
444{
445
446
447
448
449
450
451
452
453 if (time_travel_mode != TT_MODE_EXTERNAL)
454 register_pm_wake_signal();
455
456 suspend_set_ops(&um_suspend_ops);
457
458 return 0;
459}
460
461late_initcall(init_pm_wake_signal);
462#endif
463