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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 <asm/pgtable.h>
15#include <asm/processor.h>
16#include <asm/setup.h>
17#include "as-layout.h"
18#include "arch.h"
19#include "init.h"
20#include "kern.h"
21#include "kern_util.h"
22#include "mem_user.h"
23#include "os.h"
24
25#define DEFAULT_COMMAND_LINE "root=98:0"
26
27/* Changed in add_arg and setup_arch, which run before SMP is started */
28static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
29
30static void __init add_arg(char *arg)
31{
32 if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
33 printf("add_arg: Too many command line arguments!\n");
34 exit(1);
35 }
36 if (strlen(command_line) > 0)
37 strcat(command_line, " ");
38 strcat(command_line, arg);
39}
40
41/*
42 * These fields are initialized at boot time and not changed.
43 * XXX This structure is used only in the non-SMP case. Maybe this
44 * should be moved to smp.c.
45 */
46struct cpuinfo_um boot_cpu_data = {
47 .loops_per_jiffy = 0,
48 .ipi_pipe = { -1, -1 }
49};
50
51union thread_union cpu0_irqstack
52 __attribute__((__section__(".data..init_irqstack"))) =
53 { INIT_THREAD_INFO(init_task) };
54
55unsigned long thread_saved_pc(struct task_struct *task)
56{
57 /* FIXME: Need to look up userspace_pid by cpu */
58 return os_process_pc(userspace_pid[0]);
59}
60
61/* Changed in setup_arch, which is called in early boot */
62static char host_info[(__NEW_UTS_LEN + 1) * 5];
63
64static int show_cpuinfo(struct seq_file *m, void *v)
65{
66 int index = 0;
67
68#ifdef CONFIG_SMP
69 index = (struct cpuinfo_um *) v - cpu_data;
70 if (!cpu_online(index))
71 return 0;
72#endif
73
74 seq_printf(m, "processor\t: %d\n", index);
75 seq_printf(m, "vendor_id\t: User Mode Linux\n");
76 seq_printf(m, "model name\t: UML\n");
77 seq_printf(m, "mode\t\t: skas\n");
78 seq_printf(m, "host\t\t: %s\n", host_info);
79 seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
80 loops_per_jiffy/(500000/HZ),
81 (loops_per_jiffy/(5000/HZ)) % 100);
82
83 return 0;
84}
85
86static void *c_start(struct seq_file *m, loff_t *pos)
87{
88 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
89}
90
91static void *c_next(struct seq_file *m, void *v, loff_t *pos)
92{
93 ++*pos;
94 return c_start(m, pos);
95}
96
97static void c_stop(struct seq_file *m, void *v)
98{
99}
100
101const struct seq_operations cpuinfo_op = {
102 .start = c_start,
103 .next = c_next,
104 .stop = c_stop,
105 .show = show_cpuinfo,
106};
107
108/* Set in linux_main */
109unsigned long uml_physmem;
110EXPORT_SYMBOL(uml_physmem);
111
112unsigned long uml_reserved; /* Also modified in mem_init */
113unsigned long start_vm;
114unsigned long end_vm;
115
116/* Set in uml_ncpus_setup */
117int ncpus = 1;
118
119/* Set in early boot */
120static int have_root __initdata = 0;
121
122/* Set in uml_mem_setup and modified in linux_main */
123long long physmem_size = 32 * 1024 * 1024;
124
125static const char *usage_string =
126"User Mode Linux v%s\n"
127" available at http://user-mode-linux.sourceforge.net/\n\n";
128
129static int __init uml_version_setup(char *line, int *add)
130{
131 printf("%s\n", init_utsname()->release);
132 exit(0);
133
134 return 0;
135}
136
137__uml_setup("--version", uml_version_setup,
138"--version\n"
139" Prints the version number of the kernel.\n\n"
140);
141
142static int __init uml_root_setup(char *line, int *add)
143{
144 have_root = 1;
145 return 0;
146}
147
148__uml_setup("root=", uml_root_setup,
149"root=<file containing the root fs>\n"
150" This is actually used by the generic kernel in exactly the same\n"
151" way as in any other kernel. If you configure a number of block\n"
152" devices and want to boot off something other than ubd0, you \n"
153" would use something like:\n"
154" root=/dev/ubd5\n\n"
155);
156
157static int __init no_skas_debug_setup(char *line, int *add)
158{
159 printf("'debug' is not necessary to gdb UML in skas mode - run \n");
160 printf("'gdb linux'\n");
161
162 return 0;
163}
164
165__uml_setup("debug", no_skas_debug_setup,
166"debug\n"
167" this flag is not needed to run gdb on UML in skas mode\n\n"
168);
169
170#ifdef CONFIG_SMP
171static int __init uml_ncpus_setup(char *line, int *add)
172{
173 if (!sscanf(line, "%d", &ncpus)) {
174 printf("Couldn't parse [%s]\n", line);
175 return -1;
176 }
177
178 return 0;
179}
180
181__uml_setup("ncpus=", uml_ncpus_setup,
182"ncpus=<# of desired CPUs>\n"
183" This tells an SMP kernel how many virtual processors to start.\n\n"
184);
185#endif
186
187static int __init Usage(char *line, int *add)
188{
189 const char **p;
190
191 printf(usage_string, init_utsname()->release);
192 p = &__uml_help_start;
193 while (p < &__uml_help_end) {
194 printf("%s", *p);
195 p++;
196 }
197 exit(0);
198 return 0;
199}
200
201__uml_setup("--help", Usage,
202"--help\n"
203" Prints this message.\n\n"
204);
205
206static void __init uml_checksetup(char *line, int *add)
207{
208 struct uml_param *p;
209
210 p = &__uml_setup_start;
211 while (p < &__uml_setup_end) {
212 size_t n;
213
214 n = strlen(p->str);
215 if (!strncmp(line, p->str, n) && p->setup_func(line + n, add))
216 return;
217 p++;
218 }
219}
220
221static void __init uml_postsetup(void)
222{
223 initcall_t *p;
224
225 p = &__uml_postsetup_start;
226 while (p < &__uml_postsetup_end) {
227 (*p)();
228 p++;
229 }
230 return;
231}
232
233static int panic_exit(struct notifier_block *self, unsigned long unused1,
234 void *unused2)
235{
236 bust_spinlocks(1);
237 show_regs(&(current->thread.regs));
238 bust_spinlocks(0);
239 uml_exitcode = 1;
240 os_dump_core();
241 return 0;
242}
243
244static struct notifier_block panic_exit_notifier = {
245 .notifier_call = panic_exit,
246 .next = NULL,
247 .priority = 0
248};
249
250/* Set during early boot */
251unsigned long task_size;
252EXPORT_SYMBOL(task_size);
253
254unsigned long host_task_size;
255
256unsigned long brk_start;
257unsigned long end_iomem;
258EXPORT_SYMBOL(end_iomem);
259
260#define MIN_VMALLOC (32 * 1024 * 1024)
261
262extern char __binary_start;
263
264int __init linux_main(int argc, char **argv)
265{
266 unsigned long avail, diff;
267 unsigned long virtmem_size, max_physmem;
268 unsigned long stack;
269 unsigned int i;
270 int add;
271 char * mode;
272
273 for (i = 1; i < argc; i++) {
274 if ((i == 1) && (argv[i][0] == ' '))
275 continue;
276 add = 1;
277 uml_checksetup(argv[i], &add);
278 if (add)
279 add_arg(argv[i]);
280 }
281 if (have_root == 0)
282 add_arg(DEFAULT_COMMAND_LINE);
283
284 host_task_size = os_get_top_address();
285 /*
286 * TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps
287 * out
288 */
289 task_size = host_task_size & PGDIR_MASK;
290
291 /* OS sanity checks that need to happen before the kernel runs */
292 os_early_checks();
293
294 can_do_skas();
295
296 if (proc_mm && ptrace_faultinfo)
297 mode = "SKAS3";
298 else
299 mode = "SKAS0";
300
301 printf("UML running in %s mode\n", mode);
302
303 brk_start = (unsigned long) sbrk(0);
304
305 /*
306 * Increase physical memory size for exec-shield users
307 * so they actually get what they asked for. This should
308 * add zero for non-exec shield users
309 */
310
311 diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
312 if (diff > 1024 * 1024) {
313 printf("Adding %ld bytes to physical memory to account for "
314 "exec-shield gap\n", diff);
315 physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
316 }
317
318 uml_physmem = (unsigned long) &__binary_start & PAGE_MASK;
319
320 /* Reserve up to 4M after the current brk */
321 uml_reserved = ROUND_4M(brk_start) + (1 << 22);
322
323 setup_machinename(init_utsname()->machine);
324
325 highmem = 0;
326 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
327 max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
328
329 /*
330 * Zones have to begin on a 1 << MAX_ORDER page boundary,
331 * so this makes sure that's true for highmem
332 */
333 max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
334 if (physmem_size + iomem_size > max_physmem) {
335 highmem = physmem_size + iomem_size - max_physmem;
336 physmem_size -= highmem;
337#ifndef CONFIG_HIGHMEM
338 highmem = 0;
339 printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
340 "to %Lu bytes\n", physmem_size);
341#endif
342 }
343
344 high_physmem = uml_physmem + physmem_size;
345 end_iomem = high_physmem + iomem_size;
346 high_memory = (void *) end_iomem;
347
348 start_vm = VMALLOC_START;
349
350 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
351 if (init_maps(physmem_size, iomem_size, highmem)) {
352 printf("Failed to allocate mem_map for %Lu bytes of physical "
353 "memory and %Lu bytes of highmem\n", physmem_size,
354 highmem);
355 exit(1);
356 }
357
358 virtmem_size = physmem_size;
359 stack = (unsigned long) argv;
360 stack &= ~(1024 * 1024 - 1);
361 avail = stack - start_vm;
362 if (physmem_size > avail)
363 virtmem_size = avail;
364 end_vm = start_vm + virtmem_size;
365
366 if (virtmem_size < physmem_size)
367 printf("Kernel virtual memory size shrunk to %lu bytes\n",
368 virtmem_size);
369
370 atomic_notifier_chain_register(&panic_notifier_list,
371 &panic_exit_notifier);
372
373 uml_postsetup();
374
375 stack_protections((unsigned long) &init_thread_info);
376 os_flush_stdout();
377
378 return start_uml();
379}
380
381void __init setup_arch(char **cmdline_p)
382{
383 paging_init();
384 strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
385 *cmdline_p = command_line;
386 setup_hostinfo(host_info, sizeof host_info);
387}
388
389void __init check_bugs(void)
390{
391 arch_check_bugs();
392 os_check_bugs();
393}
394
395void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
396{
397}
398
399#ifdef CONFIG_SMP
400void alternatives_smp_module_add(struct module *mod, char *name,
401 void *locks, void *locks_end,
402 void *text, void *text_end)
403{
404}
405
406void alternatives_smp_module_del(struct module *mod)
407{
408}
409#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/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