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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/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/*
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 <linux/sched.h>
14#include <linux/kmsg_dump.h>
15#include <asm/pgtable.h>
16#include <asm/processor.h>
17#include <asm/sections.h>
18#include <asm/setup.h>
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>
26
27#define DEFAULT_COMMAND_LINE "root=98:0"
28
29/* Changed in add_arg and setup_arch, which run before SMP is started */
30static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
31
32static void __init add_arg(char *arg)
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 }
38 if (strlen(command_line) > 0)
39 strcat(command_line, " ");
40 strcat(command_line, arg);
41}
42
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 */
48struct cpuinfo_um boot_cpu_data = {
49 .loops_per_jiffy = 0,
50 .ipi_pipe = { -1, -1 }
51};
52
53union thread_union cpu0_irqstack
54 __attribute__((__section__(".data..init_irqstack"))) =
55 { INIT_THREAD_INFO(init_task) };
56
57unsigned long thread_saved_pc(struct task_struct *task)
58{
59 /* FIXME: Need to look up userspace_pid by cpu */
60 return os_process_pc(userspace_pid[0]);
61}
62
63/* Changed in setup_arch, which is called in early boot */
64static char host_info[(__NEW_UTS_LEN + 1) * 5];
65
66static int show_cpuinfo(struct seq_file *m, void *v)
67{
68 int index = 0;
69
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");
73 seq_printf(m, "mode\t\t: skas\n");
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
79 return 0;
80}
81
82static void *c_start(struct seq_file *m, loff_t *pos)
83{
84 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
85}
86
87static void *c_next(struct seq_file *m, void *v, loff_t *pos)
88{
89 ++*pos;
90 return c_start(m, pos);
91}
92
93static void c_stop(struct seq_file *m, void *v)
94{
95}
96
97const struct seq_operations cpuinfo_op = {
98 .start = c_start,
99 .next = c_next,
100 .stop = c_stop,
101 .show = show_cpuinfo,
102};
103
104/* Set in linux_main */
105unsigned long uml_physmem;
106EXPORT_SYMBOL(uml_physmem);
107
108unsigned long uml_reserved; /* Also modified in mem_init */
109unsigned long start_vm;
110unsigned long end_vm;
111
112/* Set in uml_ncpus_setup */
113int ncpus = 1;
114
115/* Set in early boot */
116static int have_root __initdata = 0;
117
118/* Set in uml_mem_setup and modified in linux_main */
119long long physmem_size = 32 * 1024 * 1024;
120
121static const char *usage_string =
122"User Mode Linux v%s\n"
123" available at http://user-mode-linux.sourceforge.net/\n\n";
124
125static int __init uml_version_setup(char *line, int *add)
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 printf("'debug' is not necessary to gdb UML in skas mode - run \n");
156 printf("'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 Usage(char *line, int *add)
167{
168 const char **p;
169
170 printf(usage_string, init_utsname()->release);
171 p = &__uml_help_start;
172 while (p < &__uml_help_end) {
173 printf("%s", *p);
174 p++;
175 }
176 exit(0);
177 return 0;
178}
179
180__uml_setup("--help", Usage,
181"--help\n"
182" Prints this message.\n\n"
183);
184
185static void __init uml_checksetup(char *line, int *add)
186{
187 struct uml_param *p;
188
189 p = &__uml_setup_start;
190 while (p < &__uml_setup_end) {
191 size_t n;
192
193 n = strlen(p->str);
194 if (!strncmp(line, p->str, n) && p->setup_func(line + n, add))
195 return;
196 p++;
197 }
198}
199
200static void __init uml_postsetup(void)
201{
202 initcall_t *p;
203
204 p = &__uml_postsetup_start;
205 while (p < &__uml_postsetup_end) {
206 (*p)();
207 p++;
208 }
209 return;
210}
211
212static int panic_exit(struct notifier_block *self, unsigned long unused1,
213 void *unused2)
214{
215 kmsg_dump(KMSG_DUMP_PANIC);
216 bust_spinlocks(1);
217 bust_spinlocks(0);
218 uml_exitcode = 1;
219 os_dump_core();
220 return 0;
221}
222
223static struct notifier_block panic_exit_notifier = {
224 .notifier_call = panic_exit,
225 .next = NULL,
226 .priority = 0
227};
228
229void 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
239/* Set during early boot */
240unsigned long task_size;
241EXPORT_SYMBOL(task_size);
242
243unsigned long host_task_size;
244
245unsigned long brk_start;
246unsigned long end_iomem;
247EXPORT_SYMBOL(end_iomem);
248
249#define MIN_VMALLOC (32 * 1024 * 1024)
250
251int __init linux_main(int argc, char **argv)
252{
253 unsigned long avail, diff;
254 unsigned long virtmem_size, max_physmem;
255 unsigned long stack;
256 unsigned int i;
257 int add;
258
259 for (i = 1; i < argc; i++) {
260 if ((i == 1) && (argv[i][0] == ' '))
261 continue;
262 add = 1;
263 uml_checksetup(argv[i], &add);
264 if (add)
265 add_arg(argv[i]);
266 }
267 if (have_root == 0)
268 add_arg(DEFAULT_COMMAND_LINE);
269
270 host_task_size = os_get_top_address();
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
277 /* OS sanity checks that need to happen before the kernel runs */
278 os_early_checks();
279
280 brk_start = (unsigned long) sbrk(0);
281
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 */
287
288 diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
289 if (diff > 1024 * 1024) {
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
295 uml_physmem = (unsigned long) __binary_start & PAGE_MASK;
296
297 /* Reserve up to 4M after the current brk */
298 uml_reserved = ROUND_4M(brk_start) + (1 << 22);
299
300 setup_machinename(init_utsname()->machine);
301
302 highmem = 0;
303 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
304 max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
305
306 /*
307 * Zones have to begin on a 1 << MAX_ORDER page boundary,
308 * so this makes sure that's true for highmem
309 */
310 max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
311 if (physmem_size + iomem_size > max_physmem) {
312 highmem = physmem_size + iomem_size - max_physmem;
313 physmem_size -= highmem;
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 virtmem_size = physmem_size;
323 stack = (unsigned long) argv;
324 stack &= ~(1024 * 1024 - 1);
325 avail = stack - start_vm;
326 if (physmem_size > avail)
327 virtmem_size = avail;
328 end_vm = start_vm + virtmem_size;
329
330 if (virtmem_size < physmem_size)
331 printf("Kernel virtual memory size shrunk to %lu bytes\n",
332 virtmem_size);
333
334 os_flush_stdout();
335
336 return start_uml();
337}
338
339void __init setup_arch(char **cmdline_p)
340{
341 stack_protections((unsigned long) &init_thread_info);
342 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
343 mem_total_pages(physmem_size, iomem_size, highmem);
344
345 paging_init();
346 strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
347 *cmdline_p = command_line;
348 setup_hostinfo(host_info, sizeof host_info);
349}
350
351void __init check_bugs(void)
352{
353 arch_check_bugs();
354 os_check_bugs();
355}
356
357void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
358{
359}