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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}
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 <as-layout.h>
27#include <arch.h>
28#include <init.h>
29#include <kern.h>
30#include <kern_util.h>
31#include <mem_user.h>
32#include <os.h>
33
34#include "um_arch.h"
35
36#define DEFAULT_COMMAND_LINE_ROOT "root=98:0"
37#define DEFAULT_COMMAND_LINE_CONSOLE "console=tty0"
38
39/* Changed in add_arg and setup_arch, which run before SMP is started */
40static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
41
42static void __init add_arg(char *arg)
43{
44 if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
45 os_warn("add_arg: Too many command line arguments!\n");
46 exit(1);
47 }
48 if (strlen(command_line) > 0)
49 strcat(command_line, " ");
50 strcat(command_line, arg);
51}
52
53/*
54 * These fields are initialized at boot time and not changed.
55 * XXX This structure is used only in the non-SMP case. Maybe this
56 * should be moved to smp.c.
57 */
58struct cpuinfo_um boot_cpu_data = {
59 .loops_per_jiffy = 0,
60 .ipi_pipe = { -1, -1 },
61 .cache_alignment = L1_CACHE_BYTES,
62 .x86_capability = { 0 }
63};
64
65EXPORT_SYMBOL(boot_cpu_data);
66
67union thread_union cpu0_irqstack
68 __section(".data..init_irqstack") =
69 { .thread_info = INIT_THREAD_INFO(init_task) };
70
71/* Changed in setup_arch, which is called in early boot */
72static char host_info[(__NEW_UTS_LEN + 1) * 5];
73
74static int show_cpuinfo(struct seq_file *m, void *v)
75{
76 int i = 0;
77
78 seq_printf(m, "processor\t: %d\n", i);
79 seq_printf(m, "vendor_id\t: User Mode Linux\n");
80 seq_printf(m, "model name\t: UML\n");
81 seq_printf(m, "mode\t\t: skas\n");
82 seq_printf(m, "host\t\t: %s\n", host_info);
83 seq_printf(m, "fpu\t\t: %s\n", cpu_has(&boot_cpu_data, X86_FEATURE_FPU) ? "yes" : "no");
84 seq_printf(m, "flags\t\t:");
85 for (i = 0; i < 32*NCAPINTS; i++)
86 if (cpu_has(&boot_cpu_data, i) && (x86_cap_flags[i] != NULL))
87 seq_printf(m, " %s", x86_cap_flags[i]);
88 seq_printf(m, "\n");
89 seq_printf(m, "cache_alignment\t: %d\n", boot_cpu_data.cache_alignment);
90 seq_printf(m, "bogomips\t: %lu.%02lu\n",
91 loops_per_jiffy/(500000/HZ),
92 (loops_per_jiffy/(5000/HZ)) % 100);
93
94
95 return 0;
96}
97
98static void *c_start(struct seq_file *m, loff_t *pos)
99{
100 return *pos < nr_cpu_ids ? &boot_cpu_data + *pos : NULL;
101}
102
103static void *c_next(struct seq_file *m, void *v, loff_t *pos)
104{
105 ++*pos;
106 return c_start(m, pos);
107}
108
109static void c_stop(struct seq_file *m, void *v)
110{
111}
112
113const struct seq_operations cpuinfo_op = {
114 .start = c_start,
115 .next = c_next,
116 .stop = c_stop,
117 .show = show_cpuinfo,
118};
119
120/* Set in linux_main */
121unsigned long uml_physmem;
122EXPORT_SYMBOL(uml_physmem);
123
124unsigned long uml_reserved; /* Also modified in mem_init */
125unsigned long start_vm;
126unsigned long end_vm;
127
128/* Set in uml_ncpus_setup */
129int ncpus = 1;
130
131/* Set in early boot */
132static int have_root __initdata;
133static int have_console __initdata;
134
135/* Set in uml_mem_setup and modified in linux_main */
136long long physmem_size = 64 * 1024 * 1024;
137EXPORT_SYMBOL(physmem_size);
138
139static const char *usage_string =
140"User Mode Linux v%s\n"
141" available at http://user-mode-linux.sourceforge.net/\n\n";
142
143static int __init uml_version_setup(char *line, int *add)
144{
145 /* Explicitly use printf() to show version in stdout */
146 printf("%s\n", init_utsname()->release);
147 exit(0);
148
149 return 0;
150}
151
152__uml_setup("--version", uml_version_setup,
153"--version\n"
154" Prints the version number of the kernel.\n\n"
155);
156
157static int __init uml_root_setup(char *line, int *add)
158{
159 have_root = 1;
160 return 0;
161}
162
163__uml_setup("root=", uml_root_setup,
164"root=<file containing the root fs>\n"
165" This is actually used by the generic kernel in exactly the same\n"
166" way as in any other kernel. If you configure a number of block\n"
167" devices and want to boot off something other than ubd0, you \n"
168" would use something like:\n"
169" root=/dev/ubd5\n\n"
170);
171
172static int __init no_skas_debug_setup(char *line, int *add)
173{
174 os_warn("'debug' is not necessary to gdb UML in skas mode - run\n");
175 os_warn("'gdb linux'\n");
176
177 return 0;
178}
179
180__uml_setup("debug", no_skas_debug_setup,
181"debug\n"
182" this flag is not needed to run gdb on UML in skas mode\n\n"
183);
184
185static int __init uml_console_setup(char *line, int *add)
186{
187 have_console = 1;
188 return 0;
189}
190
191__uml_setup("console=", uml_console_setup,
192"console=<preferred console>\n"
193" Specify the preferred console output driver\n\n"
194);
195
196static int __init Usage(char *line, int *add)
197{
198 const char **p;
199
200 printf(usage_string, init_utsname()->release);
201 p = &__uml_help_start;
202 /* Explicitly use printf() to show help in stdout */
203 while (p < &__uml_help_end) {
204 printf("%s", *p);
205 p++;
206 }
207 exit(0);
208 return 0;
209}
210
211__uml_setup("--help", Usage,
212"--help\n"
213" Prints this message.\n\n"
214);
215
216static void __init uml_checksetup(char *line, int *add)
217{
218 struct uml_param *p;
219
220 p = &__uml_setup_start;
221 while (p < &__uml_setup_end) {
222 size_t n;
223
224 n = strlen(p->str);
225 if (!strncmp(line, p->str, n) && p->setup_func(line + n, add))
226 return;
227 p++;
228 }
229}
230
231static void __init uml_postsetup(void)
232{
233 initcall_t *p;
234
235 p = &__uml_postsetup_start;
236 while (p < &__uml_postsetup_end) {
237 (*p)();
238 p++;
239 }
240 return;
241}
242
243static int panic_exit(struct notifier_block *self, unsigned long unused1,
244 void *unused2)
245{
246 kmsg_dump(KMSG_DUMP_PANIC);
247 bust_spinlocks(1);
248 bust_spinlocks(0);
249 uml_exitcode = 1;
250 os_dump_core();
251
252 return NOTIFY_DONE;
253}
254
255static struct notifier_block panic_exit_notifier = {
256 .notifier_call = panic_exit,
257 .priority = INT_MAX - 1, /* run as 2nd notifier, won't return */
258};
259
260void uml_finishsetup(void)
261{
262 atomic_notifier_chain_register(&panic_notifier_list,
263 &panic_exit_notifier);
264
265 uml_postsetup();
266
267 new_thread_handler();
268}
269
270/* Set during early boot */
271unsigned long stub_start;
272unsigned long task_size;
273EXPORT_SYMBOL(task_size);
274
275unsigned long host_task_size;
276
277unsigned long brk_start;
278unsigned long end_iomem;
279EXPORT_SYMBOL(end_iomem);
280
281#define MIN_VMALLOC (32 * 1024 * 1024)
282
283static void parse_host_cpu_flags(char *line)
284{
285 int i;
286 for (i = 0; i < 32*NCAPINTS; i++) {
287 if ((x86_cap_flags[i] != NULL) && strstr(line, x86_cap_flags[i]))
288 set_cpu_cap(&boot_cpu_data, i);
289 }
290}
291static void parse_cache_line(char *line)
292{
293 long res;
294 char *to_parse = strstr(line, ":");
295 if (to_parse) {
296 to_parse++;
297 while (*to_parse != 0 && isspace(*to_parse)) {
298 to_parse++;
299 }
300 if (kstrtoul(to_parse, 10, &res) == 0 && is_power_of_2(res))
301 boot_cpu_data.cache_alignment = res;
302 else
303 boot_cpu_data.cache_alignment = L1_CACHE_BYTES;
304 }
305}
306
307int __init linux_main(int argc, char **argv)
308{
309 unsigned long avail, diff;
310 unsigned long virtmem_size, max_physmem;
311 unsigned long stack;
312 unsigned int i;
313 int add;
314
315 for (i = 1; i < argc; i++) {
316 if ((i == 1) && (argv[i][0] == ' '))
317 continue;
318 add = 1;
319 uml_checksetup(argv[i], &add);
320 if (add)
321 add_arg(argv[i]);
322 }
323 if (have_root == 0)
324 add_arg(DEFAULT_COMMAND_LINE_ROOT);
325
326 if (have_console == 0)
327 add_arg(DEFAULT_COMMAND_LINE_CONSOLE);
328
329 host_task_size = os_get_top_address();
330 /* reserve a few pages for the stubs (taking care of data alignment) */
331 /* align the data portion */
332 BUILD_BUG_ON(!is_power_of_2(STUB_DATA_PAGES));
333 stub_start = (host_task_size - 1) & ~(STUB_DATA_PAGES * PAGE_SIZE - 1);
334 /* another page for the code portion */
335 stub_start -= PAGE_SIZE;
336 host_task_size = stub_start;
337
338 /*
339 * TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps
340 * out
341 */
342 task_size = host_task_size & PGDIR_MASK;
343
344 /* OS sanity checks that need to happen before the kernel runs */
345 os_early_checks();
346
347 get_host_cpu_features(parse_host_cpu_flags, parse_cache_line);
348
349 brk_start = (unsigned long) sbrk(0);
350
351 /*
352 * Increase physical memory size for exec-shield users
353 * so they actually get what they asked for. This should
354 * add zero for non-exec shield users
355 */
356
357 diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
358 if (diff > 1024 * 1024) {
359 os_info("Adding %ld bytes to physical memory to account for "
360 "exec-shield gap\n", diff);
361 physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
362 }
363
364 uml_physmem = (unsigned long) __binary_start & PAGE_MASK;
365
366 /* Reserve up to 4M after the current brk */
367 uml_reserved = ROUND_4M(brk_start) + (1 << 22);
368
369 setup_machinename(init_utsname()->machine);
370
371 highmem = 0;
372 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
373 max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
374
375 /*
376 * Zones have to begin on a 1 << MAX_PAGE_ORDER page boundary,
377 * so this makes sure that's true for highmem
378 */
379 max_physmem &= ~((1 << (PAGE_SHIFT + MAX_PAGE_ORDER)) - 1);
380 if (physmem_size + iomem_size > max_physmem) {
381 highmem = physmem_size + iomem_size - max_physmem;
382 physmem_size -= highmem;
383 }
384
385 high_physmem = uml_physmem + physmem_size;
386 end_iomem = high_physmem + iomem_size;
387 high_memory = (void *) end_iomem;
388
389 start_vm = VMALLOC_START;
390
391 virtmem_size = physmem_size;
392 stack = (unsigned long) argv;
393 stack &= ~(1024 * 1024 - 1);
394 avail = stack - start_vm;
395 if (physmem_size > avail)
396 virtmem_size = avail;
397 end_vm = start_vm + virtmem_size;
398
399 if (virtmem_size < physmem_size)
400 os_info("Kernel virtual memory size shrunk to %lu bytes\n",
401 virtmem_size);
402
403 os_flush_stdout();
404
405 return start_uml();
406}
407
408int __init __weak read_initrd(void)
409{
410 return 0;
411}
412
413void __init setup_arch(char **cmdline_p)
414{
415 u8 rng_seed[32];
416
417 stack_protections((unsigned long) &init_thread_info);
418 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
419 mem_total_pages(physmem_size, iomem_size, highmem);
420 uml_dtb_init();
421 read_initrd();
422
423 paging_init();
424 strscpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
425 *cmdline_p = command_line;
426 setup_hostinfo(host_info, sizeof host_info);
427
428 if (os_getrandom(rng_seed, sizeof(rng_seed), 0) == sizeof(rng_seed)) {
429 add_bootloader_randomness(rng_seed, sizeof(rng_seed));
430 memzero_explicit(rng_seed, sizeof(rng_seed));
431 }
432}
433
434void __init arch_cpu_finalize_init(void)
435{
436 arch_check_bugs();
437 os_check_bugs();
438}
439
440void apply_seal_endbr(s32 *start, s32 *end)
441{
442}
443
444void apply_retpolines(s32 *start, s32 *end)
445{
446}
447
448void apply_returns(s32 *start, s32 *end)
449{
450}
451
452void apply_fineibt(s32 *start_retpoline, s32 *end_retpoline,
453 s32 *start_cfi, s32 *end_cfi)
454{
455}
456
457void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
458{
459}
460
461void *text_poke(void *addr, const void *opcode, size_t len)
462{
463 /*
464 * In UML, the only reference to this function is in
465 * apply_relocate_add(), which shouldn't ever actually call this
466 * because UML doesn't have live patching.
467 */
468 WARN_ON(1);
469
470 return memcpy(addr, opcode, len);
471}
472
473void text_poke_sync(void)
474{
475}
476
477void uml_pm_wake(void)
478{
479 pm_system_wakeup();
480}
481
482#ifdef CONFIG_PM_SLEEP
483static int um_suspend_valid(suspend_state_t state)
484{
485 return state == PM_SUSPEND_MEM;
486}
487
488static int um_suspend_prepare(void)
489{
490 um_irqs_suspend();
491 return 0;
492}
493
494static int um_suspend_enter(suspend_state_t state)
495{
496 if (WARN_ON(state != PM_SUSPEND_MEM))
497 return -EINVAL;
498
499 /*
500 * This is identical to the idle sleep, but we've just
501 * (during suspend) turned off all interrupt sources
502 * except for the ones we want, so now we can only wake
503 * up on something we actually want to wake up on. All
504 * timing has also been suspended.
505 */
506 um_idle_sleep();
507 return 0;
508}
509
510static void um_suspend_finish(void)
511{
512 um_irqs_resume();
513}
514
515const struct platform_suspend_ops um_suspend_ops = {
516 .valid = um_suspend_valid,
517 .prepare = um_suspend_prepare,
518 .enter = um_suspend_enter,
519 .finish = um_suspend_finish,
520};
521
522static int init_pm_wake_signal(void)
523{
524 /*
525 * In external time-travel mode we can't use signals to wake up
526 * since that would mess with the scheduling. We'll have to do
527 * some additional work to support wakeup on virtio devices or
528 * similar, perhaps implementing a fake RTC controller that can
529 * trigger wakeup (and request the appropriate scheduling from
530 * the external scheduler when going to suspend.)
531 */
532 if (time_travel_mode != TT_MODE_EXTERNAL)
533 register_pm_wake_signal();
534
535 suspend_set_ops(&um_suspend_ops);
536
537 return 0;
538}
539
540late_initcall(init_pm_wake_signal);
541#endif