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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/*
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 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
323 mem_total_pages(physmem_size, iomem_size, highmem);
324
325 virtmem_size = physmem_size;
326 stack = (unsigned long) argv;
327 stack &= ~(1024 * 1024 - 1);
328 avail = stack - start_vm;
329 if (physmem_size > avail)
330 virtmem_size = avail;
331 end_vm = start_vm + virtmem_size;
332
333 if (virtmem_size < physmem_size)
334 printf("Kernel virtual memory size shrunk to %lu bytes\n",
335 virtmem_size);
336
337 stack_protections((unsigned long) &init_thread_info);
338 os_flush_stdout();
339
340 return start_uml();
341}
342
343void __init setup_arch(char **cmdline_p)
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}