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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4 */
5
6#include <linux/cpu.h>
7#include <linux/delay.h>
8#include <linux/init.h>
9#include <linux/mm.h>
10#include <linux/ctype.h>
11#include <linux/module.h>
12#include <linux/panic_notifier.h>
13#include <linux/seq_file.h>
14#include <linux/string.h>
15#include <linux/utsname.h>
16#include <linux/sched.h>
17#include <linux/sched/task.h>
18#include <linux/kmsg_dump.h>
19#include <linux/suspend.h>
20#include <linux/random.h>
21
22#include <asm/processor.h>
23#include <asm/cpufeature.h>
24#include <asm/sections.h>
25#include <asm/setup.h>
26#include <asm/text-patching.h>
27#include <as-layout.h>
28#include <arch.h>
29#include <init.h>
30#include <kern.h>
31#include <kern_util.h>
32#include <mem_user.h>
33#include <os.h>
34
35#include "um_arch.h"
36
37#define DEFAULT_COMMAND_LINE_ROOT "root=98:0"
38#define DEFAULT_COMMAND_LINE_CONSOLE "console=tty0"
39
40/* Changed in add_arg and setup_arch, which run before SMP is started */
41static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
42
43static void __init add_arg(char *arg)
44{
45 if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
46 os_warn("add_arg: Too many command line arguments!\n");
47 exit(1);
48 }
49 if (strlen(command_line) > 0)
50 strcat(command_line, " ");
51 strcat(command_line, arg);
52}
53
54/*
55 * These fields are initialized at boot time and not changed.
56 * XXX This structure is used only in the non-SMP case. Maybe this
57 * should be moved to smp.c.
58 */
59struct cpuinfo_um boot_cpu_data = {
60 .loops_per_jiffy = 0,
61 .ipi_pipe = { -1, -1 },
62 .cache_alignment = L1_CACHE_BYTES,
63 .x86_capability = { 0 }
64};
65
66EXPORT_SYMBOL(boot_cpu_data);
67
68
69/* Changed in setup_arch, which is called in early boot */
70static char host_info[(__NEW_UTS_LEN + 1) * 5];
71
72static int show_cpuinfo(struct seq_file *m, void *v)
73{
74 int i = 0;
75
76 seq_printf(m, "processor\t: %d\n", i);
77 seq_printf(m, "vendor_id\t: User Mode Linux\n");
78 seq_printf(m, "model name\t: UML\n");
79 seq_printf(m, "mode\t\t: skas\n");
80 seq_printf(m, "host\t\t: %s\n", host_info);
81 seq_printf(m, "fpu\t\t: %s\n", cpu_has(&boot_cpu_data, X86_FEATURE_FPU) ? "yes" : "no");
82 seq_printf(m, "flags\t\t:");
83 for (i = 0; i < 32*NCAPINTS; i++)
84 if (cpu_has(&boot_cpu_data, i) && (x86_cap_flags[i] != NULL))
85 seq_printf(m, " %s", x86_cap_flags[i]);
86 seq_printf(m, "\n");
87 seq_printf(m, "cache_alignment\t: %d\n", boot_cpu_data.cache_alignment);
88 seq_printf(m, "bogomips\t: %lu.%02lu\n",
89 loops_per_jiffy/(500000/HZ),
90 (loops_per_jiffy/(5000/HZ)) % 100);
91
92
93 return 0;
94}
95
96static void *c_start(struct seq_file *m, loff_t *pos)
97{
98 return *pos < nr_cpu_ids ? &boot_cpu_data + *pos : NULL;
99}
100
101static void *c_next(struct seq_file *m, void *v, loff_t *pos)
102{
103 ++*pos;
104 return c_start(m, pos);
105}
106
107static void c_stop(struct seq_file *m, void *v)
108{
109}
110
111const struct seq_operations cpuinfo_op = {
112 .start = c_start,
113 .next = c_next,
114 .stop = c_stop,
115 .show = show_cpuinfo,
116};
117
118/* Set in linux_main */
119unsigned long uml_physmem;
120EXPORT_SYMBOL(uml_physmem);
121
122unsigned long uml_reserved; /* Also modified in mem_init */
123unsigned long start_vm;
124unsigned long end_vm;
125
126/* Set in early boot */
127static int have_root __initdata;
128static int have_console __initdata;
129
130/* Set in uml_mem_setup and modified in linux_main */
131unsigned long long physmem_size = 64 * 1024 * 1024;
132EXPORT_SYMBOL(physmem_size);
133
134static const char *usage_string =
135"User Mode Linux v%s\n"
136" available at http://user-mode-linux.sourceforge.net/\n\n";
137
138static int __init uml_version_setup(char *line, int *add)
139{
140 /* Explicitly use printf() to show version in stdout */
141 printf("%s\n", init_utsname()->release);
142 exit(0);
143
144 return 0;
145}
146
147__uml_setup("--version", uml_version_setup,
148"--version\n"
149" Prints the version number of the kernel.\n\n"
150);
151
152static int __init uml_root_setup(char *line, int *add)
153{
154 have_root = 1;
155 return 0;
156}
157
158__uml_setup("root=", uml_root_setup,
159"root=<file containing the root fs>\n"
160" This is actually used by the generic kernel in exactly the same\n"
161" way as in any other kernel. If you configure a number of block\n"
162" devices and want to boot off something other than ubd0, you \n"
163" would use something like:\n"
164" root=/dev/ubd5\n\n"
165);
166
167static int __init uml_console_setup(char *line, int *add)
168{
169 have_console = 1;
170 return 0;
171}
172
173__uml_setup("console=", uml_console_setup,
174"console=<preferred console>\n"
175" Specify the preferred console output driver\n\n"
176);
177
178static int __init Usage(char *line, int *add)
179{
180 const char **p;
181
182 printf(usage_string, init_utsname()->release);
183 p = &__uml_help_start;
184 /* Explicitly use printf() to show help in stdout */
185 while (p < &__uml_help_end) {
186 printf("%s", *p);
187 p++;
188 }
189 exit(0);
190 return 0;
191}
192
193__uml_setup("--help", Usage,
194"--help\n"
195" Prints this message.\n\n"
196);
197
198static void __init uml_checksetup(char *line, int *add)
199{
200 struct uml_param *p;
201
202 p = &__uml_setup_start;
203 while (p < &__uml_setup_end) {
204 size_t n;
205
206 n = strlen(p->str);
207 if (!strncmp(line, p->str, n) && p->setup_func(line + n, add))
208 return;
209 p++;
210 }
211}
212
213static void __init uml_postsetup(void)
214{
215 initcall_t *p;
216
217 p = &__uml_postsetup_start;
218 while (p < &__uml_postsetup_end) {
219 (*p)();
220 p++;
221 }
222 return;
223}
224
225static int panic_exit(struct notifier_block *self, unsigned long unused1,
226 void *unused2)
227{
228 kmsg_dump(KMSG_DUMP_PANIC);
229 bust_spinlocks(1);
230 bust_spinlocks(0);
231 uml_exitcode = 1;
232 os_dump_core();
233
234 return NOTIFY_DONE;
235}
236
237static struct notifier_block panic_exit_notifier = {
238 .notifier_call = panic_exit,
239 .priority = INT_MAX - 1, /* run as 2nd notifier, won't return */
240};
241
242void uml_finishsetup(void)
243{
244 cpu_tasks[0] = &init_task;
245
246 atomic_notifier_chain_register(&panic_notifier_list,
247 &panic_exit_notifier);
248
249 uml_postsetup();
250
251 new_thread_handler();
252}
253
254/* Set during early boot */
255unsigned long stub_start;
256unsigned long task_size;
257EXPORT_SYMBOL(task_size);
258
259unsigned long host_task_size;
260
261unsigned long brk_start;
262unsigned long end_iomem;
263EXPORT_SYMBOL(end_iomem);
264
265#define MIN_VMALLOC (32 * 1024 * 1024)
266
267static void parse_host_cpu_flags(char *line)
268{
269 int i;
270 for (i = 0; i < 32*NCAPINTS; i++) {
271 if ((x86_cap_flags[i] != NULL) && strstr(line, x86_cap_flags[i]))
272 set_cpu_cap(&boot_cpu_data, i);
273 }
274}
275static void parse_cache_line(char *line)
276{
277 long res;
278 char *to_parse = strstr(line, ":");
279 if (to_parse) {
280 to_parse++;
281 while (*to_parse != 0 && isspace(*to_parse)) {
282 to_parse++;
283 }
284 if (kstrtoul(to_parse, 10, &res) == 0 && is_power_of_2(res))
285 boot_cpu_data.cache_alignment = res;
286 else
287 boot_cpu_data.cache_alignment = L1_CACHE_BYTES;
288 }
289}
290
291static unsigned long get_top_address(char **envp)
292{
293 unsigned long top_addr = (unsigned long) &top_addr;
294 int i;
295
296 /* The earliest variable should be after the program name in ELF */
297 for (i = 0; envp[i]; i++) {
298 if ((unsigned long) envp[i] > top_addr)
299 top_addr = (unsigned long) envp[i];
300 }
301
302 top_addr &= ~(UM_KERN_PAGE_SIZE - 1);
303 top_addr += UM_KERN_PAGE_SIZE;
304
305 return top_addr;
306}
307
308int __init linux_main(int argc, char **argv, char **envp)
309{
310 unsigned long avail, diff;
311 unsigned long virtmem_size, max_physmem;
312 unsigned long stack;
313 unsigned int i;
314 int add;
315
316 for (i = 1; i < argc; i++) {
317 if ((i == 1) && (argv[i][0] == ' '))
318 continue;
319 add = 1;
320 uml_checksetup(argv[i], &add);
321 if (add)
322 add_arg(argv[i]);
323 }
324 if (have_root == 0)
325 add_arg(DEFAULT_COMMAND_LINE_ROOT);
326
327 if (have_console == 0)
328 add_arg(DEFAULT_COMMAND_LINE_CONSOLE);
329
330 host_task_size = get_top_address(envp);
331 /* reserve a few pages for the stubs */
332 stub_start = host_task_size - STUB_DATA_PAGES * PAGE_SIZE;
333 /* another page for the code portion */
334 stub_start -= PAGE_SIZE;
335 host_task_size = stub_start;
336
337 /* Limit TASK_SIZE to what is addressable by the page table */
338 task_size = host_task_size;
339 if (task_size > (unsigned long long) PTRS_PER_PGD * PGDIR_SIZE)
340 task_size = PTRS_PER_PGD * PGDIR_SIZE;
341
342 /*
343 * TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps
344 * out
345 */
346 task_size = task_size & PGDIR_MASK;
347
348 /* OS sanity checks that need to happen before the kernel runs */
349 os_early_checks();
350
351 get_host_cpu_features(parse_host_cpu_flags, parse_cache_line);
352
353 brk_start = (unsigned long) sbrk(0);
354
355 /*
356 * Increase physical memory size for exec-shield users
357 * so they actually get what they asked for. This should
358 * add zero for non-exec shield users
359 */
360
361 diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
362 if (diff > 1024 * 1024) {
363 os_info("Adding %ld bytes to physical memory to account for "
364 "exec-shield gap\n", diff);
365 physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
366 }
367
368 uml_physmem = (unsigned long) __binary_start & PAGE_MASK;
369
370 /* Reserve up to 4M after the current brk */
371 uml_reserved = ROUND_4M(brk_start) + (1 << 22);
372
373 setup_machinename(init_utsname()->machine);
374
375 physmem_size = (physmem_size + PAGE_SIZE - 1) & PAGE_MASK;
376 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
377
378 max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
379
380 if (physmem_size + iomem_size > max_physmem) {
381 physmem_size = max_physmem - iomem_size;
382 os_info("Physical memory size shrunk to %llu bytes\n",
383 physmem_size);
384 }
385
386 high_physmem = uml_physmem + physmem_size;
387 end_iomem = high_physmem + iomem_size;
388 high_memory = (void *) end_iomem;
389
390 start_vm = VMALLOC_START;
391
392 virtmem_size = physmem_size;
393 stack = (unsigned long) argv;
394 stack &= ~(1024 * 1024 - 1);
395 avail = stack - start_vm;
396 if (physmem_size > avail)
397 virtmem_size = avail;
398 end_vm = start_vm + virtmem_size;
399
400 if (virtmem_size < physmem_size)
401 os_info("Kernel virtual memory size shrunk to %lu bytes\n",
402 virtmem_size);
403
404 arch_task_struct_size = sizeof(struct task_struct) + host_fp_size;
405
406 os_flush_stdout();
407
408 return start_uml();
409}
410
411int __init __weak read_initrd(void)
412{
413 return 0;
414}
415
416void __init setup_arch(char **cmdline_p)
417{
418 u8 rng_seed[32];
419
420 stack_protections((unsigned long) init_task.stack);
421 setup_physmem(uml_physmem, uml_reserved, physmem_size);
422 mem_total_pages(physmem_size, iomem_size);
423 uml_dtb_init();
424 read_initrd();
425
426 paging_init();
427 strscpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
428 *cmdline_p = command_line;
429 setup_hostinfo(host_info, sizeof host_info);
430
431 if (os_getrandom(rng_seed, sizeof(rng_seed), 0) == sizeof(rng_seed)) {
432 add_bootloader_randomness(rng_seed, sizeof(rng_seed));
433 memzero_explicit(rng_seed, sizeof(rng_seed));
434 }
435}
436
437void __init arch_cpu_finalize_init(void)
438{
439 arch_check_bugs();
440 os_check_bugs();
441}
442
443void apply_seal_endbr(s32 *start, s32 *end, struct module *mod)
444{
445}
446
447void apply_retpolines(s32 *start, s32 *end, struct module *mod)
448{
449}
450
451void apply_returns(s32 *start, s32 *end, struct module *mod)
452{
453}
454
455void apply_fineibt(s32 *start_retpoline, s32 *end_retpoline,
456 s32 *start_cfi, s32 *end_cfi, struct module *mod)
457{
458}
459
460void apply_alternatives(struct alt_instr *start, struct alt_instr *end,
461 struct module *mod)
462{
463}
464
465void *text_poke(void *addr, const void *opcode, size_t len)
466{
467 /*
468 * In UML, the only reference to this function is in
469 * apply_relocate_add(), which shouldn't ever actually call this
470 * because UML doesn't have live patching.
471 */
472 WARN_ON(1);
473
474 return memcpy(addr, opcode, len);
475}
476
477void *text_poke_copy(void *addr, const void *opcode, size_t len)
478{
479 return text_poke(addr, opcode, len);
480}
481
482void text_poke_sync(void)
483{
484}
485
486void uml_pm_wake(void)
487{
488 pm_system_wakeup();
489}
490
491#ifdef CONFIG_PM_SLEEP
492static int um_suspend_valid(suspend_state_t state)
493{
494 return state == PM_SUSPEND_MEM;
495}
496
497static int um_suspend_prepare(void)
498{
499 um_irqs_suspend();
500 return 0;
501}
502
503static int um_suspend_enter(suspend_state_t state)
504{
505 if (WARN_ON(state != PM_SUSPEND_MEM))
506 return -EINVAL;
507
508 /*
509 * This is identical to the idle sleep, but we've just
510 * (during suspend) turned off all interrupt sources
511 * except for the ones we want, so now we can only wake
512 * up on something we actually want to wake up on. All
513 * timing has also been suspended.
514 */
515 um_idle_sleep();
516 return 0;
517}
518
519static void um_suspend_finish(void)
520{
521 um_irqs_resume();
522}
523
524const struct platform_suspend_ops um_suspend_ops = {
525 .valid = um_suspend_valid,
526 .prepare = um_suspend_prepare,
527 .enter = um_suspend_enter,
528 .finish = um_suspend_finish,
529};
530
531static int init_pm_wake_signal(void)
532{
533 /*
534 * In external time-travel mode we can't use signals to wake up
535 * since that would mess with the scheduling. We'll have to do
536 * some additional work to support wakeup on virtio devices or
537 * similar, perhaps implementing a fake RTC controller that can
538 * trigger wakeup (and request the appropriate scheduling from
539 * the external scheduler when going to suspend.)
540 */
541 if (time_travel_mode != TT_MODE_EXTERNAL)
542 register_pm_wake_signal();
543
544 suspend_set_ops(&um_suspend_ops);
545
546 return 0;
547}
548
549late_initcall(init_pm_wake_signal);
550#endif
1/*
2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
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 <asm/pgtable.h>
14#include <asm/processor.h>
15#include <asm/setup.h>
16#include "as-layout.h"
17#include "arch.h"
18#include "init.h"
19#include "kern.h"
20#include "kern_util.h"
21#include "mem_user.h"
22#include "os.h"
23
24#define DEFAULT_COMMAND_LINE "root=98:0"
25
26/* Changed in add_arg and setup_arch, which run before SMP is started */
27static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
28
29static void __init add_arg(char *arg)
30{
31 if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
32 printf("add_arg: Too many command line arguments!\n");
33 exit(1);
34 }
35 if (strlen(command_line) > 0)
36 strcat(command_line, " ");
37 strcat(command_line, arg);
38}
39
40/*
41 * These fields are initialized at boot time and not changed.
42 * XXX This structure is used only in the non-SMP case. Maybe this
43 * should be moved to smp.c.
44 */
45struct cpuinfo_um boot_cpu_data = {
46 .loops_per_jiffy = 0,
47 .ipi_pipe = { -1, -1 }
48};
49
50unsigned long thread_saved_pc(struct task_struct *task)
51{
52 /* FIXME: Need to look up userspace_pid by cpu */
53 return os_process_pc(userspace_pid[0]);
54}
55
56/* Changed in setup_arch, which is called in early boot */
57static char host_info[(__NEW_UTS_LEN + 1) * 5];
58
59static int show_cpuinfo(struct seq_file *m, void *v)
60{
61 int index = 0;
62
63#ifdef CONFIG_SMP
64 index = (struct cpuinfo_um *) v - cpu_data;
65 if (!cpu_online(index))
66 return 0;
67#endif
68
69 seq_printf(m, "processor\t: %d\n", index);
70 seq_printf(m, "vendor_id\t: User Mode Linux\n");
71 seq_printf(m, "model name\t: UML\n");
72 seq_printf(m, "mode\t\t: skas\n");
73 seq_printf(m, "host\t\t: %s\n", host_info);
74 seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
75 loops_per_jiffy/(500000/HZ),
76 (loops_per_jiffy/(5000/HZ)) % 100);
77
78 return 0;
79}
80
81static void *c_start(struct seq_file *m, loff_t *pos)
82{
83 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
84}
85
86static void *c_next(struct seq_file *m, void *v, loff_t *pos)
87{
88 ++*pos;
89 return c_start(m, pos);
90}
91
92static void c_stop(struct seq_file *m, void *v)
93{
94}
95
96const struct seq_operations cpuinfo_op = {
97 .start = c_start,
98 .next = c_next,
99 .stop = c_stop,
100 .show = show_cpuinfo,
101};
102
103/* Set in linux_main */
104unsigned long uml_physmem;
105unsigned long uml_reserved; /* Also modified in mem_init */
106unsigned long start_vm;
107unsigned long end_vm;
108
109/* Set in uml_ncpus_setup */
110int ncpus = 1;
111
112/* Set in early boot */
113static int have_root __initdata = 0;
114
115/* Set in uml_mem_setup and modified in linux_main */
116long long physmem_size = 32 * 1024 * 1024;
117
118static const char *usage_string =
119"User Mode Linux v%s\n"
120" available at http://user-mode-linux.sourceforge.net/\n\n";
121
122static int __init uml_version_setup(char *line, int *add)
123{
124 printf("%s\n", init_utsname()->release);
125 exit(0);
126
127 return 0;
128}
129
130__uml_setup("--version", uml_version_setup,
131"--version\n"
132" Prints the version number of the kernel.\n\n"
133);
134
135static int __init uml_root_setup(char *line, int *add)
136{
137 have_root = 1;
138 return 0;
139}
140
141__uml_setup("root=", uml_root_setup,
142"root=<file containing the root fs>\n"
143" This is actually used by the generic kernel in exactly the same\n"
144" way as in any other kernel. If you configure a number of block\n"
145" devices and want to boot off something other than ubd0, you \n"
146" would use something like:\n"
147" root=/dev/ubd5\n\n"
148);
149
150static int __init no_skas_debug_setup(char *line, int *add)
151{
152 printf("'debug' is not necessary to gdb UML in skas mode - run \n");
153 printf("'gdb linux'\n");
154
155 return 0;
156}
157
158__uml_setup("debug", no_skas_debug_setup,
159"debug\n"
160" this flag is not needed to run gdb on UML in skas mode\n\n"
161);
162
163#ifdef CONFIG_SMP
164static int __init uml_ncpus_setup(char *line, int *add)
165{
166 if (!sscanf(line, "%d", &ncpus)) {
167 printf("Couldn't parse [%s]\n", line);
168 return -1;
169 }
170
171 return 0;
172}
173
174__uml_setup("ncpus=", uml_ncpus_setup,
175"ncpus=<# of desired CPUs>\n"
176" This tells an SMP kernel how many virtual processors to start.\n\n"
177);
178#endif
179
180static int __init Usage(char *line, int *add)
181{
182 const char **p;
183
184 printf(usage_string, init_utsname()->release);
185 p = &__uml_help_start;
186 while (p < &__uml_help_end) {
187 printf("%s", *p);
188 p++;
189 }
190 exit(0);
191 return 0;
192}
193
194__uml_setup("--help", Usage,
195"--help\n"
196" Prints this message.\n\n"
197);
198
199static void __init uml_checksetup(char *line, int *add)
200{
201 struct uml_param *p;
202
203 p = &__uml_setup_start;
204 while (p < &__uml_setup_end) {
205 size_t n;
206
207 n = strlen(p->str);
208 if (!strncmp(line, p->str, n) && p->setup_func(line + n, add))
209 return;
210 p++;
211 }
212}
213
214static void __init uml_postsetup(void)
215{
216 initcall_t *p;
217
218 p = &__uml_postsetup_start;
219 while (p < &__uml_postsetup_end) {
220 (*p)();
221 p++;
222 }
223 return;
224}
225
226static int panic_exit(struct notifier_block *self, unsigned long unused1,
227 void *unused2)
228{
229 bust_spinlocks(1);
230 show_regs(&(current->thread.regs));
231 bust_spinlocks(0);
232 uml_exitcode = 1;
233 os_dump_core();
234 return 0;
235}
236
237static struct notifier_block panic_exit_notifier = {
238 .notifier_call = panic_exit,
239 .next = NULL,
240 .priority = 0
241};
242
243/* Set during early boot */
244unsigned long task_size;
245EXPORT_SYMBOL(task_size);
246
247unsigned long host_task_size;
248
249unsigned long brk_start;
250unsigned long end_iomem;
251EXPORT_SYMBOL(end_iomem);
252
253#define MIN_VMALLOC (32 * 1024 * 1024)
254
255extern char __binary_start;
256
257int __init linux_main(int argc, char **argv)
258{
259 unsigned long avail, diff;
260 unsigned long virtmem_size, max_physmem;
261 unsigned long stack;
262 unsigned int i;
263 int add;
264 char * mode;
265
266 for (i = 1; i < argc; i++) {
267 if ((i == 1) && (argv[i][0] == ' '))
268 continue;
269 add = 1;
270 uml_checksetup(argv[i], &add);
271 if (add)
272 add_arg(argv[i]);
273 }
274 if (have_root == 0)
275 add_arg(DEFAULT_COMMAND_LINE);
276
277 host_task_size = os_get_top_address();
278 /*
279 * TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps
280 * out
281 */
282 task_size = host_task_size & PGDIR_MASK;
283
284 /* OS sanity checks that need to happen before the kernel runs */
285 os_early_checks();
286
287 can_do_skas();
288
289 if (proc_mm && ptrace_faultinfo)
290 mode = "SKAS3";
291 else
292 mode = "SKAS0";
293
294 printf("UML running in %s mode\n", mode);
295
296 brk_start = (unsigned long) sbrk(0);
297
298 /*
299 * Increase physical memory size for exec-shield users
300 * so they actually get what they asked for. This should
301 * add zero for non-exec shield users
302 */
303
304 diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
305 if (diff > 1024 * 1024) {
306 printf("Adding %ld bytes to physical memory to account for "
307 "exec-shield gap\n", diff);
308 physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
309 }
310
311 uml_physmem = (unsigned long) &__binary_start & PAGE_MASK;
312
313 /* Reserve up to 4M after the current brk */
314 uml_reserved = ROUND_4M(brk_start) + (1 << 22);
315
316 setup_machinename(init_utsname()->machine);
317
318 highmem = 0;
319 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
320 max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
321
322 /*
323 * Zones have to begin on a 1 << MAX_ORDER page boundary,
324 * so this makes sure that's true for highmem
325 */
326 max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
327 if (physmem_size + iomem_size > max_physmem) {
328 highmem = physmem_size + iomem_size - max_physmem;
329 physmem_size -= highmem;
330#ifndef CONFIG_HIGHMEM
331 highmem = 0;
332 printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
333 "to %Lu bytes\n", physmem_size);
334#endif
335 }
336
337 high_physmem = uml_physmem + physmem_size;
338 end_iomem = high_physmem + iomem_size;
339 high_memory = (void *) end_iomem;
340
341 start_vm = VMALLOC_START;
342
343 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
344 if (init_maps(physmem_size, iomem_size, highmem)) {
345 printf("Failed to allocate mem_map for %Lu bytes of physical "
346 "memory and %Lu bytes of highmem\n", physmem_size,
347 highmem);
348 exit(1);
349 }
350
351 virtmem_size = physmem_size;
352 stack = (unsigned long) argv;
353 stack &= ~(1024 * 1024 - 1);
354 avail = stack - start_vm;
355 if (physmem_size > avail)
356 virtmem_size = avail;
357 end_vm = start_vm + virtmem_size;
358
359 if (virtmem_size < physmem_size)
360 printf("Kernel virtual memory size shrunk to %lu bytes\n",
361 virtmem_size);
362
363 atomic_notifier_chain_register(&panic_notifier_list,
364 &panic_exit_notifier);
365
366 uml_postsetup();
367
368 stack_protections((unsigned long) &init_thread_info);
369 os_flush_stdout();
370
371 return start_uml();
372}
373
374void __init setup_arch(char **cmdline_p)
375{
376 paging_init();
377 strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
378 *cmdline_p = command_line;
379 setup_hostinfo(host_info, sizeof host_info);
380}
381
382void __init check_bugs(void)
383{
384 arch_check_bugs();
385 os_check_bugs();
386}
387
388void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
389{
390}
391
392#ifdef CONFIG_SMP
393void alternatives_smp_module_add(struct module *mod, char *name,
394 void *locks, void *locks_end,
395 void *text, void *text_end)
396{
397}
398
399void alternatives_smp_module_del(struct module *mod)
400{
401}
402#endif