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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/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;
116
117static const char *usage_string =
118"User Mode Linux v%s\n"
119" available at http://user-mode-linux.sourceforge.net/\n\n";
120
121static int __init uml_version_setup(char *line, int *add)
122{
123 /* Explicitly use printf() to show version in stdout */
124 printf("%s\n", init_utsname()->release);
125 exit(0);
126
127 return 0;
128}
129
130__uml_setup("--version", uml_version_setup,
131"--version\n"
132" Prints the version number of the kernel.\n\n"
133);
134
135static int __init uml_root_setup(char *line, int *add)
136{
137 have_root = 1;
138 return 0;
139}
140
141__uml_setup("root=", uml_root_setup,
142"root=<file containing the root fs>\n"
143" This is actually used by the generic kernel in exactly the same\n"
144" way as in any other kernel. If you configure a number of block\n"
145" devices and want to boot off something other than ubd0, you \n"
146" would use something like:\n"
147" root=/dev/ubd5\n\n"
148);
149
150static int __init no_skas_debug_setup(char *line, int *add)
151{
152 os_warn("'debug' is not necessary to gdb UML in skas mode - run\n");
153 os_warn("'gdb linux'\n");
154
155 return 0;
156}
157
158__uml_setup("debug", no_skas_debug_setup,
159"debug\n"
160" this flag is not needed to run gdb on UML in skas mode\n\n"
161);
162
163static int __init Usage(char *line, int *add)
164{
165 const char **p;
166
167 printf(usage_string, init_utsname()->release);
168 p = &__uml_help_start;
169 /* Explicitly use printf() to show help in stdout */
170 while (p < &__uml_help_end) {
171 printf("%s", *p);
172 p++;
173 }
174 exit(0);
175 return 0;
176}
177
178__uml_setup("--help", Usage,
179"--help\n"
180" Prints this message.\n\n"
181);
182
183static void __init uml_checksetup(char *line, int *add)
184{
185 struct uml_param *p;
186
187 p = &__uml_setup_start;
188 while (p < &__uml_setup_end) {
189 size_t n;
190
191 n = strlen(p->str);
192 if (!strncmp(line, p->str, n) && p->setup_func(line + n, add))
193 return;
194 p++;
195 }
196}
197
198static void __init uml_postsetup(void)
199{
200 initcall_t *p;
201
202 p = &__uml_postsetup_start;
203 while (p < &__uml_postsetup_end) {
204 (*p)();
205 p++;
206 }
207 return;
208}
209
210static int panic_exit(struct notifier_block *self, unsigned long unused1,
211 void *unused2)
212{
213 kmsg_dump(KMSG_DUMP_PANIC);
214 bust_spinlocks(1);
215 bust_spinlocks(0);
216 uml_exitcode = 1;
217 os_dump_core();
218 return 0;
219}
220
221static struct notifier_block panic_exit_notifier = {
222 .notifier_call = panic_exit,
223 .next = NULL,
224 .priority = 0
225};
226
227void uml_finishsetup(void)
228{
229 atomic_notifier_chain_register(&panic_notifier_list,
230 &panic_exit_notifier);
231
232 uml_postsetup();
233
234 new_thread_handler();
235}
236
237/* Set during early boot */
238unsigned long task_size;
239EXPORT_SYMBOL(task_size);
240
241unsigned long host_task_size;
242
243unsigned long brk_start;
244unsigned long end_iomem;
245EXPORT_SYMBOL(end_iomem);
246
247#define MIN_VMALLOC (32 * 1024 * 1024)
248
249int __init linux_main(int argc, char **argv)
250{
251 unsigned long avail, diff;
252 unsigned long virtmem_size, max_physmem;
253 unsigned long stack;
254 unsigned int i;
255 int add;
256
257 for (i = 1; i < argc; i++) {
258 if ((i == 1) && (argv[i][0] == ' '))
259 continue;
260 add = 1;
261 uml_checksetup(argv[i], &add);
262 if (add)
263 add_arg(argv[i]);
264 }
265 if (have_root == 0)
266 add_arg(DEFAULT_COMMAND_LINE);
267
268 host_task_size = os_get_top_address();
269 /*
270 * TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps
271 * out
272 */
273 task_size = host_task_size & PGDIR_MASK;
274
275 /* OS sanity checks that need to happen before the kernel runs */
276 os_early_checks();
277
278 brk_start = (unsigned long) sbrk(0);
279
280 /*
281 * Increase physical memory size for exec-shield users
282 * so they actually get what they asked for. This should
283 * add zero for non-exec shield users
284 */
285
286 diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
287 if (diff > 1024 * 1024) {
288 os_info("Adding %ld bytes to physical memory to account for "
289 "exec-shield gap\n", diff);
290 physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
291 }
292
293 uml_physmem = (unsigned long) __binary_start & PAGE_MASK;
294
295 /* Reserve up to 4M after the current brk */
296 uml_reserved = ROUND_4M(brk_start) + (1 << 22);
297
298 setup_machinename(init_utsname()->machine);
299
300 highmem = 0;
301 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
302 max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
303
304 /*
305 * Zones have to begin on a 1 << MAX_ORDER page boundary,
306 * so this makes sure that's true for highmem
307 */
308 max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
309 if (physmem_size + iomem_size > max_physmem) {
310 highmem = physmem_size + iomem_size - max_physmem;
311 physmem_size -= highmem;
312 }
313
314 high_physmem = uml_physmem + physmem_size;
315 end_iomem = high_physmem + iomem_size;
316 high_memory = (void *) end_iomem;
317
318 start_vm = VMALLOC_START;
319
320 virtmem_size = physmem_size;
321 stack = (unsigned long) argv;
322 stack &= ~(1024 * 1024 - 1);
323 avail = stack - start_vm;
324 if (physmem_size > avail)
325 virtmem_size = avail;
326 end_vm = start_vm + virtmem_size;
327
328 if (virtmem_size < physmem_size)
329 os_info("Kernel virtual memory size shrunk to %lu bytes\n",
330 virtmem_size);
331
332 os_flush_stdout();
333
334 return start_uml();
335}
336
337int __init __weak read_initrd(void)
338{
339 return 0;
340}
341
342void __init setup_arch(char **cmdline_p)
343{
344 stack_protections((unsigned long) &init_thread_info);
345 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
346 mem_total_pages(physmem_size, iomem_size, highmem);
347 read_initrd();
348
349 paging_init();
350 strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
351 *cmdline_p = command_line;
352 setup_hostinfo(host_info, sizeof host_info);
353}
354
355void __init check_bugs(void)
356{
357 arch_check_bugs();
358 os_check_bugs();
359}
360
361void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
362{
363}
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}