2 * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
6 #include "linux/config.h"
7 #include "linux/kernel.h"
8 #include "linux/sched.h"
9 #include "linux/notifier.h"
11 #include "linux/types.h"
12 #include "linux/tty.h"
13 #include "linux/init.h"
14 #include "linux/bootmem.h"
15 #include "linux/spinlock.h"
16 #include "linux/utsname.h"
17 #include "linux/sysrq.h"
18 #include "linux/seq_file.h"
19 #include "linux/delay.h"
21 #include "asm/pgtable.h"
22 #include "asm/ptrace.h"
26 #include "asm/current.h"
27 #include "user_util.h"
28 #include "kern_util.h"
37 #include "choose-mode.h"
38 #include "mode_kern.h"
41 #define DEFAULT_COMMAND_LINE "root=6200"
43 struct cpuinfo_um boot_cpu_data = {
45 .ipi_pipe = { -1, -1 }
48 unsigned long thread_saved_pc(struct task_struct *task)
50 return(os_process_pc(CHOOSE_MODE_PROC(thread_pid_tt, thread_pid_skas,
54 static int show_cpuinfo(struct seq_file *m, void *v)
58 index = (struct cpuinfo_um *)v - cpu_data;
60 if (!cpu_online(index))
64 seq_printf(m, "bogomips\t: %lu.%02lu\n",
65 loops_per_jiffy/(500000/HZ),
66 (loops_per_jiffy/(5000/HZ)) % 100);
67 seq_printf(m, "host\t\t: %s\n", host_info);
72 static void *c_start(struct seq_file *m, loff_t *pos)
74 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
77 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
80 return c_start(m, pos);
83 static void c_stop(struct seq_file *m, void *v)
87 struct seq_operations cpuinfo_op = {
94 pte_t * __bad_pagetable(void)
96 panic("Someone should implement __bad_pagetable");
100 /* Set in linux_main */
101 unsigned long host_task_size;
102 unsigned long task_size;
104 unsigned long uml_start;
106 /* Set in early boot */
107 unsigned long uml_physmem;
108 unsigned long uml_reserved;
109 unsigned long start_vm;
110 unsigned long end_vm;
113 #ifdef CONFIG_MODE_TT
114 /* Pointer set in linux_main, the array itself is private to each thread,
115 * and changed at address space creation time so this poses no concurrency
118 static char *argv1_begin = NULL;
119 static char *argv1_end = NULL;
122 /* Set in early boot */
123 static int have_root __initdata = 0;
124 long physmem_size = 32 * 1024 * 1024;
126 void set_cmdline(char *cmd)
128 #ifdef CONFIG_MODE_TT
131 if(CHOOSE_MODE(honeypot, 0)) return;
135 snprintf(argv1_begin,
136 (argv1_end - argv1_begin) * sizeof(*ptr),
138 ptr = &argv1_begin[strlen(argv1_begin)];
140 else ptr = argv1_begin;
142 snprintf(ptr, (argv1_end - ptr) * sizeof(*ptr), " [%s]", cmd);
143 memset(argv1_begin + strlen(argv1_begin), '\0',
144 argv1_end - argv1_begin - strlen(argv1_begin));
148 static char *usage_string =
149 "User Mode Linux v%s\n"
150 " available at http://user-mode-linux.sourceforge.net/\n\n";
152 static int __init uml_version_setup(char *line, int *add)
154 printf("%s\n", system_utsname.release);
158 __uml_setup("--version", uml_version_setup,
160 " Prints the version number of the kernel.\n\n"
163 static int __init uml_root_setup(char *line, int *add)
169 __uml_setup("root=", uml_root_setup,
170 "root=<file containing the root fs>\n"
171 " This is actually used by the generic kernel in exactly the same\n"
172 " way as in any other kernel. If you configure a number of block\n"
173 " devices and want to boot off something other than ubd0, you \n"
174 " would use something like:\n"
175 " root=/dev/ubd5\n\n"
179 static int __init uml_ncpus_setup(char *line, int *add)
181 if (!sscanf(line, "%d", &ncpus)) {
182 printk("Couldn't parse [%s]\n", line);
189 __uml_setup("ncpus=", uml_ncpus_setup,
190 "ncpus=<# of desired CPUs>\n"
191 " This tells an SMP kernel how many virtual processors to start.\n\n"
197 #if defined(CONFIG_MODE_TT) && defined(CONFIG_MODE_SKAS)
200 static int __init mode_tt_setup(char *line, int *add)
207 #ifdef CONFIG_MODE_SKAS
211 static int __init mode_tt_setup(char *line, int *add)
213 printk("CONFIG_MODE_TT disabled - 'mode=tt' ignored\n");
218 #ifdef CONFIG_MODE_TT
222 static int __init mode_tt_setup(char *line, int *add)
224 printk("CONFIG_MODE_SKAS disabled - 'mode=tt' redundant\n");
230 #error Either CONFIG_MODE_TT or CONFIG_MODE_SKAS must be enabled
236 __uml_setup("mode=tt", mode_tt_setup,
238 " When both CONFIG_MODE_TT and CONFIG_MODE_SKAS are enabled, this option\n"
239 " forces UML to run in tt (tracing thread) mode. It is not the default\n"
240 " because it's slower and less secure than skas mode.\n\n"
243 int mode_tt = DEFAULT_TT;
245 static int __init Usage(char *line, int *add)
249 printf(usage_string, system_utsname.release);
250 p = &__uml_help_start;
251 while (p < &__uml_help_end) {
258 __uml_setup("--help", Usage,
260 " Prints this message.\n\n"
263 static int __init uml_checksetup(char *line, int *add)
267 p = &__uml_setup_start;
268 while(p < &__uml_setup_end) {
272 if(!strncmp(line, p->str, n)){
273 if (p->setup_func(line + n, add)) return 1;
280 static void __init uml_postsetup(void)
284 p = &__uml_postsetup_start;
285 while(p < &__uml_postsetup_end){
292 /* Set during early boot */
293 unsigned long brk_start;
294 static struct vm_reserved kernel_vm_reserved;
296 #define MIN_VMALLOC (32 * 1024 * 1024)
298 int linux_main(int argc, char **argv)
301 unsigned long virtmem_size, max_physmem;
302 unsigned int i, add, err;
304 for (i = 1; i < argc; i++){
305 if((i == 1) && (argv[i][0] == ' ')) continue;
307 uml_checksetup(argv[i], &add);
308 if(add) add_arg(saved_command_line, argv[i]);
310 if(have_root == 0) add_arg(saved_command_line, DEFAULT_COMMAND_LINE);
312 mode_tt = force_tt ? 1 : !can_do_skas();
313 uml_start = CHOOSE_MODE_PROC(set_task_sizes_tt, set_task_sizes_skas, 0,
314 &host_task_size, &task_size);
316 brk_start = (unsigned long) sbrk(0);
317 CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start);
319 uml_physmem = uml_start;
321 /* Reserve up to 4M after the current brk */
322 uml_reserved = ROUND_4M(brk_start) + (1 << 22);
324 setup_machinename(system_utsname.machine);
326 #ifdef CONFIG_MODE_TT
327 argv1_begin = argv[1];
328 argv1_end = &argv[1][strlen(argv[1])];
331 set_usable_vm(uml_physmem, get_kmem_end());
334 max_physmem = get_kmem_end() - uml_physmem - MIN_VMALLOC;
335 if(physmem_size > max_physmem){
336 highmem = physmem_size - max_physmem;
337 physmem_size -= highmem;
338 #ifndef CONFIG_HIGHMEM
340 printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
341 "to %ld bytes\n", physmem_size);
345 high_physmem = uml_physmem + physmem_size;
346 high_memory = (void *) high_physmem;
348 start_vm = VMALLOC_START;
350 setup_physmem(uml_physmem, uml_reserved, physmem_size);
351 virtmem_size = physmem_size;
352 avail = get_kmem_end() - start_vm;
353 if(physmem_size > avail) virtmem_size = avail;
354 end_vm = start_vm + virtmem_size;
356 if(virtmem_size < physmem_size)
357 printf("Kernel virtual memory size shrunk to %ld bytes\n",
360 err = reserve_vm(high_physmem, end_vm, &kernel_vm_reserved);
362 printf("Failed to reserve VM area for kernel VM\n");
368 init_task.thread.kernel_stack = (unsigned long) &init_thread_info +
371 task_protections((unsigned long) &init_thread_info);
373 return(CHOOSE_MODE(start_uml_tt(), start_uml_skas()));
376 static int panic_exit(struct notifier_block *self, unsigned long unused1,
379 #ifdef CONFIG_MAGIC_SYSRQ
380 handle_sysrq('p', ¤t->thread.regs, NULL, NULL);
386 static struct notifier_block panic_exit_notifier = {
387 .notifier_call = panic_exit,
392 void __init setup_arch(char **cmdline_p)
394 notifier_chain_register(&panic_notifier_list, &panic_exit_notifier);
396 strcpy(command_line, saved_command_line);
397 *cmdline_p = command_line;
401 void __init check_bugs(void)
409 * Overrides for Emacs so that we follow Linus's tabbing style.
410 * Emacs will notice this stuff at the end of the file and automatically
411 * adjust the settings for this buffer only. This must remain at the end
413 * ---------------------------------------------------------------------------
415 * c-file-style: "linux"