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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/*
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