Loading...
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/delay.h>
7#include <linux/init.h>
8#include <linux/mm.h>
9#include <linux/ctype.h>
10#include <linux/module.h>
11#include <linux/panic_notifier.h>
12#include <linux/seq_file.h>
13#include <linux/string.h>
14#include <linux/utsname.h>
15#include <linux/sched.h>
16#include <linux/sched/task.h>
17#include <linux/kmsg_dump.h>
18#include <linux/suspend.h>
19#include <linux/random.h>
20
21#include <asm/processor.h>
22#include <asm/cpufeature.h>
23#include <asm/sections.h>
24#include <asm/setup.h>
25#include <as-layout.h>
26#include <arch.h>
27#include <init.h>
28#include <kern.h>
29#include <kern_util.h>
30#include <mem_user.h>
31#include <os.h>
32
33#include "um_arch.h"
34
35#define DEFAULT_COMMAND_LINE_ROOT "root=98:0"
36#define DEFAULT_COMMAND_LINE_CONSOLE "console=tty0"
37
38/* Changed in add_arg and setup_arch, which run before SMP is started */
39static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
40
41static void __init add_arg(char *arg)
42{
43 if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
44 os_warn("add_arg: Too many command line arguments!\n");
45 exit(1);
46 }
47 if (strlen(command_line) > 0)
48 strcat(command_line, " ");
49 strcat(command_line, arg);
50}
51
52/*
53 * These fields are initialized at boot time and not changed.
54 * XXX This structure is used only in the non-SMP case. Maybe this
55 * should be moved to smp.c.
56 */
57struct cpuinfo_um boot_cpu_data = {
58 .loops_per_jiffy = 0,
59 .ipi_pipe = { -1, -1 },
60 .cache_alignment = L1_CACHE_BYTES,
61 .x86_capability = { 0 }
62};
63
64EXPORT_SYMBOL(boot_cpu_data);
65
66union thread_union cpu0_irqstack
67 __section(".data..init_irqstack") =
68 { .thread_info = INIT_THREAD_INFO(init_task) };
69
70/* Changed in setup_arch, which is called in early boot */
71static char host_info[(__NEW_UTS_LEN + 1) * 5];
72
73static int show_cpuinfo(struct seq_file *m, void *v)
74{
75 int i = 0;
76
77 seq_printf(m, "processor\t: %d\n", i);
78 seq_printf(m, "vendor_id\t: User Mode Linux\n");
79 seq_printf(m, "model name\t: UML\n");
80 seq_printf(m, "mode\t\t: skas\n");
81 seq_printf(m, "host\t\t: %s\n", host_info);
82 seq_printf(m, "fpu\t\t: %s\n", cpu_has(&boot_cpu_data, X86_FEATURE_FPU) ? "yes" : "no");
83 seq_printf(m, "flags\t\t:");
84 for (i = 0; i < 32*NCAPINTS; i++)
85 if (cpu_has(&boot_cpu_data, i) && (x86_cap_flags[i] != NULL))
86 seq_printf(m, " %s", x86_cap_flags[i]);
87 seq_printf(m, "\n");
88 seq_printf(m, "cache_alignment\t: %d\n", boot_cpu_data.cache_alignment);
89 seq_printf(m, "bogomips\t: %lu.%02lu\n",
90 loops_per_jiffy/(500000/HZ),
91 (loops_per_jiffy/(5000/HZ)) % 100);
92
93
94 return 0;
95}
96
97static void *c_start(struct seq_file *m, loff_t *pos)
98{
99 return *pos < nr_cpu_ids ? cpu_data + *pos : NULL;
100}
101
102static void *c_next(struct seq_file *m, void *v, loff_t *pos)
103{
104 ++*pos;
105 return c_start(m, pos);
106}
107
108static void c_stop(struct seq_file *m, void *v)
109{
110}
111
112const struct seq_operations cpuinfo_op = {
113 .start = c_start,
114 .next = c_next,
115 .stop = c_stop,
116 .show = show_cpuinfo,
117};
118
119/* Set in linux_main */
120unsigned long uml_physmem;
121EXPORT_SYMBOL(uml_physmem);
122
123unsigned long uml_reserved; /* Also modified in mem_init */
124unsigned long start_vm;
125unsigned long end_vm;
126
127/* Set in uml_ncpus_setup */
128int ncpus = 1;
129
130/* Set in early boot */
131static int have_root __initdata;
132static int have_console __initdata;
133
134/* Set in uml_mem_setup and modified in linux_main */
135long long physmem_size = 64 * 1024 * 1024;
136EXPORT_SYMBOL(physmem_size);
137
138static const char *usage_string =
139"User Mode Linux v%s\n"
140" available at http://user-mode-linux.sourceforge.net/\n\n";
141
142static int __init uml_version_setup(char *line, int *add)
143{
144 /* Explicitly use printf() to show version in stdout */
145 printf("%s\n", init_utsname()->release);
146 exit(0);
147
148 return 0;
149}
150
151__uml_setup("--version", uml_version_setup,
152"--version\n"
153" Prints the version number of the kernel.\n\n"
154);
155
156static int __init uml_root_setup(char *line, int *add)
157{
158 have_root = 1;
159 return 0;
160}
161
162__uml_setup("root=", uml_root_setup,
163"root=<file containing the root fs>\n"
164" This is actually used by the generic kernel in exactly the same\n"
165" way as in any other kernel. If you configure a number of block\n"
166" devices and want to boot off something other than ubd0, you \n"
167" would use something like:\n"
168" root=/dev/ubd5\n\n"
169);
170
171static int __init no_skas_debug_setup(char *line, int *add)
172{
173 os_warn("'debug' is not necessary to gdb UML in skas mode - run\n");
174 os_warn("'gdb linux'\n");
175
176 return 0;
177}
178
179__uml_setup("debug", no_skas_debug_setup,
180"debug\n"
181" this flag is not needed to run gdb on UML in skas mode\n\n"
182);
183
184static int __init uml_console_setup(char *line, int *add)
185{
186 have_console = 1;
187 return 0;
188}
189
190__uml_setup("console=", uml_console_setup,
191"console=<preferred console>\n"
192" Specify the preferred console output driver\n\n"
193);
194
195static int __init Usage(char *line, int *add)
196{
197 const char **p;
198
199 printf(usage_string, init_utsname()->release);
200 p = &__uml_help_start;
201 /* Explicitly use printf() to show help in stdout */
202 while (p < &__uml_help_end) {
203 printf("%s", *p);
204 p++;
205 }
206 exit(0);
207 return 0;
208}
209
210__uml_setup("--help", Usage,
211"--help\n"
212" Prints this message.\n\n"
213);
214
215static void __init uml_checksetup(char *line, int *add)
216{
217 struct uml_param *p;
218
219 p = &__uml_setup_start;
220 while (p < &__uml_setup_end) {
221 size_t n;
222
223 n = strlen(p->str);
224 if (!strncmp(line, p->str, n) && p->setup_func(line + n, add))
225 return;
226 p++;
227 }
228}
229
230static void __init uml_postsetup(void)
231{
232 initcall_t *p;
233
234 p = &__uml_postsetup_start;
235 while (p < &__uml_postsetup_end) {
236 (*p)();
237 p++;
238 }
239 return;
240}
241
242static int panic_exit(struct notifier_block *self, unsigned long unused1,
243 void *unused2)
244{
245 kmsg_dump(KMSG_DUMP_PANIC);
246 bust_spinlocks(1);
247 bust_spinlocks(0);
248 uml_exitcode = 1;
249 os_dump_core();
250
251 return NOTIFY_DONE;
252}
253
254static struct notifier_block panic_exit_notifier = {
255 .notifier_call = panic_exit,
256 .priority = INT_MAX - 1, /* run as 2nd notifier, won't return */
257};
258
259void uml_finishsetup(void)
260{
261 atomic_notifier_chain_register(&panic_notifier_list,
262 &panic_exit_notifier);
263
264 uml_postsetup();
265
266 new_thread_handler();
267}
268
269/* Set during early boot */
270unsigned long stub_start;
271unsigned long task_size;
272EXPORT_SYMBOL(task_size);
273
274unsigned long host_task_size;
275
276unsigned long brk_start;
277unsigned long end_iomem;
278EXPORT_SYMBOL(end_iomem);
279
280#define MIN_VMALLOC (32 * 1024 * 1024)
281
282static void parse_host_cpu_flags(char *line)
283{
284 int i;
285 for (i = 0; i < 32*NCAPINTS; i++) {
286 if ((x86_cap_flags[i] != NULL) && strstr(line, x86_cap_flags[i]))
287 set_cpu_cap(&boot_cpu_data, i);
288 }
289}
290static void parse_cache_line(char *line)
291{
292 long res;
293 char *to_parse = strstr(line, ":");
294 if (to_parse) {
295 to_parse++;
296 while (*to_parse != 0 && isspace(*to_parse)) {
297 to_parse++;
298 }
299 if (kstrtoul(to_parse, 10, &res) == 0 && is_power_of_2(res))
300 boot_cpu_data.cache_alignment = res;
301 else
302 boot_cpu_data.cache_alignment = L1_CACHE_BYTES;
303 }
304}
305
306int __init linux_main(int argc, char **argv)
307{
308 unsigned long avail, diff;
309 unsigned long virtmem_size, max_physmem;
310 unsigned long stack;
311 unsigned int i;
312 int add;
313
314 for (i = 1; i < argc; i++) {
315 if ((i == 1) && (argv[i][0] == ' '))
316 continue;
317 add = 1;
318 uml_checksetup(argv[i], &add);
319 if (add)
320 add_arg(argv[i]);
321 }
322 if (have_root == 0)
323 add_arg(DEFAULT_COMMAND_LINE_ROOT);
324
325 if (have_console == 0)
326 add_arg(DEFAULT_COMMAND_LINE_CONSOLE);
327
328 host_task_size = os_get_top_address();
329 /* reserve two pages for the stubs */
330 host_task_size -= 2 * PAGE_SIZE;
331 stub_start = host_task_size;
332
333 /*
334 * TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps
335 * out
336 */
337 task_size = host_task_size & PGDIR_MASK;
338
339 /* OS sanity checks that need to happen before the kernel runs */
340 os_early_checks();
341
342 get_host_cpu_features(parse_host_cpu_flags, parse_cache_line);
343
344 brk_start = (unsigned long) sbrk(0);
345
346 /*
347 * Increase physical memory size for exec-shield users
348 * so they actually get what they asked for. This should
349 * add zero for non-exec shield users
350 */
351
352 diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
353 if (diff > 1024 * 1024) {
354 os_info("Adding %ld bytes to physical memory to account for "
355 "exec-shield gap\n", diff);
356 physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
357 }
358
359 uml_physmem = (unsigned long) __binary_start & PAGE_MASK;
360
361 /* Reserve up to 4M after the current brk */
362 uml_reserved = ROUND_4M(brk_start) + (1 << 22);
363
364 setup_machinename(init_utsname()->machine);
365
366 highmem = 0;
367 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
368 max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
369
370 /*
371 * Zones have to begin on a 1 << MAX_ORDER page boundary,
372 * so this makes sure that's true for highmem
373 */
374 max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
375 if (physmem_size + iomem_size > max_physmem) {
376 highmem = physmem_size + iomem_size - max_physmem;
377 physmem_size -= highmem;
378 }
379
380 high_physmem = uml_physmem + physmem_size;
381 end_iomem = high_physmem + iomem_size;
382 high_memory = (void *) end_iomem;
383
384 start_vm = VMALLOC_START;
385
386 virtmem_size = physmem_size;
387 stack = (unsigned long) argv;
388 stack &= ~(1024 * 1024 - 1);
389 avail = stack - start_vm;
390 if (physmem_size > avail)
391 virtmem_size = avail;
392 end_vm = start_vm + virtmem_size;
393
394 if (virtmem_size < physmem_size)
395 os_info("Kernel virtual memory size shrunk to %lu bytes\n",
396 virtmem_size);
397
398 os_flush_stdout();
399
400 return start_uml();
401}
402
403int __init __weak read_initrd(void)
404{
405 return 0;
406}
407
408void __init setup_arch(char **cmdline_p)
409{
410 u8 rng_seed[32];
411
412 stack_protections((unsigned long) &init_thread_info);
413 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
414 mem_total_pages(physmem_size, iomem_size, highmem);
415 uml_dtb_init();
416 read_initrd();
417
418 paging_init();
419 strscpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
420 *cmdline_p = command_line;
421 setup_hostinfo(host_info, sizeof host_info);
422
423 if (os_getrandom(rng_seed, sizeof(rng_seed), 0) == sizeof(rng_seed)) {
424 add_bootloader_randomness(rng_seed, sizeof(rng_seed));
425 memzero_explicit(rng_seed, sizeof(rng_seed));
426 }
427}
428
429void __init check_bugs(void)
430{
431 arch_check_bugs();
432 os_check_bugs();
433}
434
435void apply_ibt_endbr(s32 *start, s32 *end)
436{
437}
438
439void apply_retpolines(s32 *start, s32 *end)
440{
441}
442
443void apply_returns(s32 *start, s32 *end)
444{
445}
446
447void apply_fineibt(s32 *start_retpoline, s32 *end_retpoline,
448 s32 *start_cfi, s32 *end_cfi)
449{
450}
451
452void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
453{
454}
455
456void *text_poke(void *addr, const void *opcode, size_t len)
457{
458 /*
459 * In UML, the only reference to this function is in
460 * apply_relocate_add(), which shouldn't ever actually call this
461 * because UML doesn't have live patching.
462 */
463 WARN_ON(1);
464
465 return memcpy(addr, opcode, len);
466}
467
468void text_poke_sync(void)
469{
470}
471
472void uml_pm_wake(void)
473{
474 pm_system_wakeup();
475}
476
477#ifdef CONFIG_PM_SLEEP
478static int um_suspend_valid(suspend_state_t state)
479{
480 return state == PM_SUSPEND_MEM;
481}
482
483static int um_suspend_prepare(void)
484{
485 um_irqs_suspend();
486 return 0;
487}
488
489static int um_suspend_enter(suspend_state_t state)
490{
491 if (WARN_ON(state != PM_SUSPEND_MEM))
492 return -EINVAL;
493
494 /*
495 * This is identical to the idle sleep, but we've just
496 * (during suspend) turned off all interrupt sources
497 * except for the ones we want, so now we can only wake
498 * up on something we actually want to wake up on. All
499 * timing has also been suspended.
500 */
501 um_idle_sleep();
502 return 0;
503}
504
505static void um_suspend_finish(void)
506{
507 um_irqs_resume();
508}
509
510const struct platform_suspend_ops um_suspend_ops = {
511 .valid = um_suspend_valid,
512 .prepare = um_suspend_prepare,
513 .enter = um_suspend_enter,
514 .finish = um_suspend_finish,
515};
516
517static int init_pm_wake_signal(void)
518{
519 /*
520 * In external time-travel mode we can't use signals to wake up
521 * since that would mess with the scheduling. We'll have to do
522 * some additional work to support wakeup on virtio devices or
523 * similar, perhaps implementing a fake RTC controller that can
524 * trigger wakeup (and request the appropriate scheduling from
525 * the external scheduler when going to suspend.)
526 */
527 if (time_travel_mode != TT_MODE_EXTERNAL)
528 register_pm_wake_signal();
529
530 suspend_set_ops(&um_suspend_ops);
531
532 return 0;
533}
534
535late_initcall(init_pm_wake_signal);
536#endif
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/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/* Changed in add_arg and setup_arch, which run before SMP is started */
32static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
33
34static 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 * These fields are initialized at boot time and not changed.
47 * XXX This structure is used only in the non-SMP case. Maybe this
48 * should be moved to smp.c.
49 */
50struct cpuinfo_um boot_cpu_data = {
51 .loops_per_jiffy = 0,
52 .ipi_pipe = { -1, -1 }
53};
54
55union thread_union cpu0_irqstack
56 __attribute__((__section__(".data..init_irqstack"))) =
57 { .thread_info = INIT_THREAD_INFO(init_task) };
58
59/* Changed in setup_arch, which is called in early boot */
60static char host_info[(__NEW_UTS_LEN + 1) * 5];
61
62static 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
78static void *c_start(struct seq_file *m, loff_t *pos)
79{
80 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
81}
82
83static void *c_next(struct seq_file *m, void *v, loff_t *pos)
84{
85 ++*pos;
86 return c_start(m, pos);
87}
88
89static void c_stop(struct seq_file *m, void *v)
90{
91}
92
93const struct seq_operations cpuinfo_op = {
94 .start = c_start,
95 .next = c_next,
96 .stop = c_stop,
97 .show = show_cpuinfo,
98};
99
100/* Set in linux_main */
101unsigned long uml_physmem;
102EXPORT_SYMBOL(uml_physmem);
103
104unsigned long uml_reserved; /* Also modified in mem_init */
105unsigned long start_vm;
106unsigned long end_vm;
107
108/* Set in uml_ncpus_setup */
109int ncpus = 1;
110
111/* Set in early boot */
112static int have_root __initdata = 0;
113
114/* Set in uml_mem_setup and modified in linux_main */
115long long physmem_size = 32 * 1024 * 1024;
116EXPORT_SYMBOL(physmem_size);
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 /* Explicitly use printf() to show version in stdout */
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
136static 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
151static 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
164static 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 /* Explicitly use printf() to show help in stdout */
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
184static 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
199static 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
211static 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
222static struct notifier_block panic_exit_notifier = {
223 .notifier_call = panic_exit,
224 .next = NULL,
225 .priority = 0
226};
227
228void 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/* Set during early boot */
239unsigned long task_size;
240EXPORT_SYMBOL(task_size);
241
242unsigned long host_task_size;
243
244unsigned long brk_start;
245unsigned long end_iomem;
246EXPORT_SYMBOL(end_iomem);
247
248#define MIN_VMALLOC (32 * 1024 * 1024)
249
250int __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 * TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps
272 * out
273 */
274 task_size = host_task_size & PGDIR_MASK;
275
276 /* OS sanity checks that need to happen before the kernel runs */
277 os_early_checks();
278
279 brk_start = (unsigned long) sbrk(0);
280
281 /*
282 * Increase physical memory size for exec-shield users
283 * so they actually get what they asked for. This should
284 * add zero for non-exec shield users
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 /* Reserve up to 4M after the current brk */
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 * Zones have to begin on a 1 << MAX_ORDER page boundary,
307 * so this makes sure that's true for highmem
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
338int __init __weak read_initrd(void)
339{
340 return 0;
341}
342
343void __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
356void __init check_bugs(void)
357{
358 arch_check_bugs();
359 os_check_bugs();
360}
361
362void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
363{
364}