2 * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
6 #include "linux/kernel.h"
7 #include "linux/sched.h"
8 #include "linux/notifier.h"
10 #include "linux/types.h"
11 #include "linux/tty.h"
12 #include "linux/init.h"
13 #include "linux/bootmem.h"
14 #include "linux/spinlock.h"
15 #include "linux/utsname.h"
16 #include "linux/sysrq.h"
17 #include "linux/seq_file.h"
18 #include "linux/delay.h"
19 #include "linux/module.h"
20 #include "linux/utsname.h"
22 #include "asm/pgtable.h"
23 #include "asm/ptrace.h"
26 #include "asm/setup.h"
28 #include "asm/current.h"
29 #include "user_util.h"
30 #include "kern_util.h"
31 #include "as-layout.h"
39 #include "choose-mode.h"
40 #include "mode_kern.h"
42 #ifdef UML_CONFIG_MODE_SKAS
46 #define DEFAULT_COMMAND_LINE "root=98:0"
48 /* Changed in linux_main and setup_arch, which run before SMP is started */
49 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
51 static void __init add_arg(char *arg)
53 if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
54 printf("add_arg: Too many command line arguments!\n");
57 if(strlen(command_line) > 0)
58 strcat(command_line, " ");
59 strcat(command_line, arg);
62 struct cpuinfo_um boot_cpu_data = {
64 .ipi_pipe = { -1, -1 }
67 unsigned long thread_saved_pc(struct task_struct *task)
69 return os_process_pc(CHOOSE_MODE_PROC(thread_pid_tt, thread_pid_skas,
73 /* Changed in setup_arch, which is called in early boot */
74 static char host_info[(__NEW_UTS_LEN + 1) * 5];
76 static int show_cpuinfo(struct seq_file *m, void *v)
81 index = (struct cpuinfo_um *) v - cpu_data;
82 if (!cpu_online(index))
86 seq_printf(m, "processor\t: %d\n", index);
87 seq_printf(m, "vendor_id\t: User Mode Linux\n");
88 seq_printf(m, "model name\t: UML\n");
89 seq_printf(m, "mode\t\t: %s\n", CHOOSE_MODE("tt", "skas"));
90 seq_printf(m, "host\t\t: %s\n", host_info);
91 seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
92 loops_per_jiffy/(500000/HZ),
93 (loops_per_jiffy/(5000/HZ)) % 100);
98 static void *c_start(struct seq_file *m, loff_t *pos)
100 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
103 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
106 return c_start(m, pos);
109 static void c_stop(struct seq_file *m, void *v)
113 const struct seq_operations cpuinfo_op = {
117 .show = show_cpuinfo,
120 /* Set in linux_main */
121 unsigned long host_task_size;
122 unsigned long task_size;
124 unsigned long uml_start;
126 /* Set in early boot */
127 unsigned long uml_physmem;
128 unsigned long uml_reserved;
129 unsigned long start_vm;
130 unsigned long end_vm;
133 #ifdef CONFIG_CMDLINE_ON_HOST
134 /* Pointer set in linux_main, the array itself is private to each thread,
135 * and changed at address space creation time so this poses no concurrency
138 static char *argv1_begin = NULL;
139 static char *argv1_end = NULL;
142 /* Set in early boot */
143 static int have_root __initdata = 0;
144 long long physmem_size = 32 * 1024 * 1024;
146 void set_cmdline(char *cmd)
148 #ifdef CONFIG_CMDLINE_ON_HOST
151 if(CHOOSE_MODE(honeypot, 0)) return;
155 snprintf(argv1_begin,
156 (argv1_end - argv1_begin) * sizeof(*ptr),
158 ptr = &argv1_begin[strlen(argv1_begin)];
160 else ptr = argv1_begin;
162 snprintf(ptr, (argv1_end - ptr) * sizeof(*ptr), "[%s]", cmd);
163 memset(argv1_begin + strlen(argv1_begin), '\0',
164 argv1_end - argv1_begin - strlen(argv1_begin));
168 static char *usage_string =
169 "User Mode Linux v%s\n"
170 " available at http://user-mode-linux.sourceforge.net/\n\n";
172 static int __init uml_version_setup(char *line, int *add)
174 printf("%s\n", init_utsname()->release);
180 __uml_setup("--version", uml_version_setup,
182 " Prints the version number of the kernel.\n\n"
185 static int __init uml_root_setup(char *line, int *add)
191 __uml_setup("root=", uml_root_setup,
192 "root=<file containing the root fs>\n"
193 " This is actually used by the generic kernel in exactly the same\n"
194 " way as in any other kernel. If you configure a number of block\n"
195 " devices and want to boot off something other than ubd0, you \n"
196 " would use something like:\n"
197 " root=/dev/ubd5\n\n"
200 #ifndef CONFIG_MODE_TT
202 static int __init no_skas_debug_setup(char *line, int *add)
204 printf("'debug' is not necessary to gdb UML in skas mode - run \n");
205 printf("'gdb linux' and disable CONFIG_CMDLINE_ON_HOST if gdb \n");
206 printf("doesn't work as expected\n");
211 __uml_setup("debug", no_skas_debug_setup,
213 " this flag is not needed to run gdb on UML in skas mode\n\n"
219 static int __init uml_ncpus_setup(char *line, int *add)
221 if (!sscanf(line, "%d", &ncpus)) {
222 printf("Couldn't parse [%s]\n", line);
229 __uml_setup("ncpus=", uml_ncpus_setup,
230 "ncpus=<# of desired CPUs>\n"
231 " This tells an SMP kernel how many virtual processors to start.\n\n"
235 static int force_tt = 0;
237 #if defined(CONFIG_MODE_TT) && defined(CONFIG_MODE_SKAS)
240 static int __init mode_tt_setup(char *line, int *add)
247 #ifdef CONFIG_MODE_SKAS
251 static int __init mode_tt_setup(char *line, int *add)
253 printf("CONFIG_MODE_TT disabled - 'mode=tt' ignored\n");
258 #ifdef CONFIG_MODE_TT
262 static int __init mode_tt_setup(char *line, int *add)
264 printf("CONFIG_MODE_SKAS disabled - 'mode=tt' redundant\n");
272 __uml_setup("mode=tt", mode_tt_setup,
274 " When both CONFIG_MODE_TT and CONFIG_MODE_SKAS are enabled, this option\n"
275 " forces UML to run in tt (tracing thread) mode. It is not the default\n"
276 " because it's slower and less secure than skas mode.\n\n"
279 int mode_tt = DEFAULT_TT;
281 static int __init Usage(char *line, int *add)
285 printf(usage_string, init_utsname()->release);
286 p = &__uml_help_start;
287 while (p < &__uml_help_end) {
295 __uml_setup("--help", Usage,
297 " Prints this message.\n\n"
300 static int __init uml_checksetup(char *line, int *add)
304 p = &__uml_setup_start;
305 while(p < &__uml_setup_end) {
309 if(!strncmp(line, p->str, n)){
310 if (p->setup_func(line + n, add)) return 1;
317 static void __init uml_postsetup(void)
321 p = &__uml_postsetup_start;
322 while(p < &__uml_postsetup_end){
329 /* Set during early boot */
330 unsigned long brk_start;
331 unsigned long end_iomem;
332 EXPORT_SYMBOL(end_iomem);
334 #define MIN_VMALLOC (32 * 1024 * 1024)
336 extern char __binary_start;
338 int __init linux_main(int argc, char **argv)
340 unsigned long avail, diff;
341 unsigned long virtmem_size, max_physmem;
345 for (i = 1; i < argc; i++){
346 if((i == 1) && (argv[i][0] == ' ')) continue;
348 uml_checksetup(argv[i], &add);
353 add_arg(DEFAULT_COMMAND_LINE);
358 mode_tt = force_tt ? 1 : !can_do_skas();
359 #ifndef CONFIG_MODE_TT
361 /*Since CONFIG_MODE_TT is #undef'ed, force_tt cannot be 1. So,
362 * can_do_skas() returned 0, and the message is correct. */
363 printf("Support for TT mode is disabled, and no SKAS support is present on the host.\n");
368 #ifndef CONFIG_MODE_SKAS
371 /* Show to the user the result of selection */
374 else if (proc_mm && ptrace_faultinfo)
380 printf("UML running in %s mode\n", mode);
382 uml_start = (unsigned long) &__binary_start;
383 host_task_size = CHOOSE_MODE_PROC(set_task_sizes_tt,
384 set_task_sizes_skas, &task_size);
387 * Setting up handlers to 'sig_info' struct
389 os_fill_handlinfo(handlinfo_kern);
391 brk_start = (unsigned long) sbrk(0);
392 CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start);
393 /* Increase physical memory size for exec-shield users
394 so they actually get what they asked for. This should
395 add zero for non-exec shield users */
397 diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
398 if(diff > 1024 * 1024){
399 printf("Adding %ld bytes to physical memory to account for "
400 "exec-shield gap\n", diff);
401 physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
404 uml_physmem = uml_start & PAGE_MASK;
406 /* Reserve up to 4M after the current brk */
407 uml_reserved = ROUND_4M(brk_start) + (1 << 22);
409 setup_machinename(init_utsname()->machine);
411 #ifdef CONFIG_CMDLINE_ON_HOST
412 argv1_begin = argv[1];
413 argv1_end = &argv[1][strlen(argv[1])];
417 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
418 max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC;
420 /* Zones have to begin on a 1 << MAX_ORDER page boundary,
421 * so this makes sure that's true for highmem
423 max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
424 if(physmem_size + iomem_size > max_physmem){
425 highmem = physmem_size + iomem_size - max_physmem;
426 physmem_size -= highmem;
427 #ifndef CONFIG_HIGHMEM
429 printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
430 "to %Lu bytes\n", physmem_size);
434 high_physmem = uml_physmem + physmem_size;
435 end_iomem = high_physmem + iomem_size;
436 high_memory = (void *) end_iomem;
438 start_vm = VMALLOC_START;
440 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
441 if(init_maps(physmem_size, iomem_size, highmem)){
442 printf("Failed to allocate mem_map for %Lu bytes of physical "
443 "memory and %Lu bytes of highmem\n", physmem_size,
448 virtmem_size = physmem_size;
449 avail = get_kmem_end() - start_vm;
450 if(physmem_size > avail) virtmem_size = avail;
451 end_vm = start_vm + virtmem_size;
453 if(virtmem_size < physmem_size)
454 printf("Kernel virtual memory size shrunk to %lu bytes\n",
459 task_protections((unsigned long) &init_thread_info);
462 return CHOOSE_MODE(start_uml_tt(), start_uml_skas());
465 extern int uml_exitcode;
467 static int panic_exit(struct notifier_block *self, unsigned long unused1,
471 show_regs(&(current->thread.regs));
478 static struct notifier_block panic_exit_notifier = {
479 .notifier_call = panic_exit,
484 void __init setup_arch(char **cmdline_p)
486 atomic_notifier_chain_register(&panic_notifier_list,
487 &panic_exit_notifier);
489 strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
490 *cmdline_p = command_line;
491 setup_hostinfo(host_info, sizeof host_info);
494 void __init check_bugs(void)
500 void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
505 void alternatives_smp_module_add(struct module *mod, char *name,
506 void *locks, void *locks_end,
507 void *text, void *text_end)
511 void alternatives_smp_module_del(struct module *mod)