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