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=98:0"
43 struct cpuinfo_um boot_cpu_data = {
45 .ipi_pipe = { -1, -1 }
48 /* Placeholder to make UML link until the vsyscall stuff is actually
51 void *__kernel_vsyscall;
53 unsigned long thread_saved_pc(struct task_struct *task)
55 return(os_process_pc(CHOOSE_MODE_PROC(thread_pid_tt, thread_pid_skas,
59 static int show_cpuinfo(struct seq_file *m, void *v)
64 index = (struct cpuinfo_um *) v - cpu_data;
65 if (!cpu_online(index))
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: %s\n", CHOOSE_MODE("tt", "skas"));
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);
81 static void *c_start(struct seq_file *m, loff_t *pos)
83 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
86 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
89 return c_start(m, pos);
92 static void c_stop(struct seq_file *m, void *v)
96 struct seq_operations cpuinfo_op = {
100 .show = show_cpuinfo,
103 pte_t * __bad_pagetable(void)
105 panic("Someone should implement __bad_pagetable");
109 /* Set in linux_main */
110 unsigned long host_task_size;
111 unsigned long task_size;
113 unsigned long uml_start;
115 /* Set in early boot */
116 unsigned long uml_physmem;
117 unsigned long uml_reserved;
118 unsigned long start_vm;
119 unsigned long end_vm;
122 #ifdef CONFIG_MODE_TT
123 /* Pointer set in linux_main, the array itself is private to each thread,
124 * and changed at address space creation time so this poses no concurrency
127 static char *argv1_begin = NULL;
128 static char *argv1_end = NULL;
131 /* Set in early boot */
132 static int have_root __initdata = 0;
133 long physmem_size = 32 * 1024 * 1024;
135 void set_cmdline(char *cmd)
137 #ifdef CONFIG_MODE_TT
140 if(CHOOSE_MODE(honeypot, 0)) return;
144 snprintf(argv1_begin,
145 (argv1_end - argv1_begin) * sizeof(*ptr),
147 ptr = &argv1_begin[strlen(argv1_begin)];
149 else ptr = argv1_begin;
151 snprintf(ptr, (argv1_end - ptr) * sizeof(*ptr), "[%s]", cmd);
152 memset(argv1_begin + strlen(argv1_begin), '\0',
153 argv1_end - argv1_begin - strlen(argv1_begin));
157 static char *usage_string =
158 "User Mode Linux v%s\n"
159 " available at http://user-mode-linux.sourceforge.net/\n\n";
161 static int __init uml_version_setup(char *line, int *add)
163 printf("%s\n", system_utsname.release);
167 __uml_setup("--version", uml_version_setup,
169 " Prints the version number of the kernel.\n\n"
172 static int __init uml_root_setup(char *line, int *add)
178 __uml_setup("root=", uml_root_setup,
179 "root=<file containing the root fs>\n"
180 " This is actually used by the generic kernel in exactly the same\n"
181 " way as in any other kernel. If you configure a number of block\n"
182 " devices and want to boot off something other than ubd0, you \n"
183 " would use something like:\n"
184 " root=/dev/ubd5\n\n"
188 static int __init uml_ncpus_setup(char *line, int *add)
190 if (!sscanf(line, "%d", &ncpus)) {
191 printf("Couldn't parse [%s]\n", line);
198 __uml_setup("ncpus=", uml_ncpus_setup,
199 "ncpus=<# of desired CPUs>\n"
200 " This tells an SMP kernel how many virtual processors to start.\n\n"
206 #if defined(CONFIG_MODE_TT) && defined(CONFIG_MODE_SKAS)
209 static int __init mode_tt_setup(char *line, int *add)
216 #ifdef CONFIG_MODE_SKAS
220 static int __init mode_tt_setup(char *line, int *add)
222 printf("CONFIG_MODE_TT disabled - 'mode=tt' ignored\n");
227 #ifdef CONFIG_MODE_TT
231 static int __init mode_tt_setup(char *line, int *add)
233 printf("CONFIG_MODE_SKAS disabled - 'mode=tt' redundant\n");
239 #error Either CONFIG_MODE_TT or CONFIG_MODE_SKAS must be enabled
245 __uml_setup("mode=tt", mode_tt_setup,
247 " When both CONFIG_MODE_TT and CONFIG_MODE_SKAS are enabled, this option\n"
248 " forces UML to run in tt (tracing thread) mode. It is not the default\n"
249 " because it's slower and less secure than skas mode.\n\n"
252 int mode_tt = DEFAULT_TT;
254 static int __init Usage(char *line, int *add)
258 printf(usage_string, system_utsname.release);
259 p = &__uml_help_start;
260 while (p < &__uml_help_end) {
267 __uml_setup("--help", Usage,
269 " Prints this message.\n\n"
272 static int __init uml_checksetup(char *line, int *add)
276 p = &__uml_setup_start;
277 while(p < &__uml_setup_end) {
281 if(!strncmp(line, p->str, n)){
282 if (p->setup_func(line + n, add)) return 1;
289 static void __init uml_postsetup(void)
293 p = &__uml_postsetup_start;
294 while(p < &__uml_postsetup_end){
301 /* Set during early boot */
302 unsigned long brk_start;
303 unsigned long end_iomem;
305 #define MIN_VMALLOC (32 * 1024 * 1024)
307 int linux_main(int argc, char **argv)
310 unsigned long virtmem_size, max_physmem;
313 for (i = 1; i < argc; i++){
314 if((i == 1) && (argv[i][0] == ' ')) continue;
316 uml_checksetup(argv[i], &add);
317 if(add) add_arg(saved_command_line, argv[i]);
319 if(have_root == 0) add_arg(saved_command_line, DEFAULT_COMMAND_LINE);
321 mode_tt = force_tt ? 1 : !can_do_skas();
322 uml_start = CHOOSE_MODE_PROC(set_task_sizes_tt, set_task_sizes_skas, 0,
323 &host_task_size, &task_size);
325 brk_start = (unsigned long) sbrk(0);
326 CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start);
328 uml_physmem = uml_start;
330 /* Reserve up to 4M after the current brk */
331 uml_reserved = ROUND_4M(brk_start) + (1 << 22);
333 setup_machinename(system_utsname.machine);
335 #ifdef CONFIG_MODE_TT
336 argv1_begin = argv[1];
337 argv1_end = &argv[1][strlen(argv[1])];
341 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
342 max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC;
344 /* Zones have to begin on a 1 << MAX_ORDER page boundary,
345 * so this makes sure that's true for highmem
347 max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
348 if(physmem_size + iomem_size > max_physmem){
349 highmem = physmem_size + iomem_size - max_physmem;
350 physmem_size -= highmem;
351 #ifndef CONFIG_HIGHMEM
353 printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
354 "to %ld bytes\n", physmem_size);
358 high_physmem = uml_physmem + physmem_size;
359 end_iomem = high_physmem + iomem_size;
360 high_memory = (void *) end_iomem;
362 start_vm = VMALLOC_START;
364 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
365 if(init_maps(physmem_size, iomem_size, highmem)){
366 printf("Failed to allocate mem_map for %ld bytes of physical "
367 "memory and %ld bytes of highmem\n", physmem_size,
372 virtmem_size = physmem_size;
373 avail = get_kmem_end() - start_vm;
374 if(physmem_size > avail) virtmem_size = avail;
375 end_vm = start_vm + virtmem_size;
377 if(virtmem_size < physmem_size)
378 printf("Kernel virtual memory size shrunk to %ld bytes\n",
383 init_task.thread.kernel_stack = (unsigned long) &init_thread_info +
386 task_protections((unsigned long) &init_thread_info);
389 return(CHOOSE_MODE(start_uml_tt(), start_uml_skas()));
392 extern int uml_exitcode;
394 static int panic_exit(struct notifier_block *self, unsigned long unused1,
397 #ifdef CONFIG_MAGIC_SYSRQ
398 handle_sysrq('p', ¤t->thread.regs, NULL);
405 static struct notifier_block panic_exit_notifier = {
406 .notifier_call = panic_exit,
411 void __init setup_arch(char **cmdline_p)
413 notifier_chain_register(&panic_notifier_list, &panic_exit_notifier);
415 strcpy(command_line, saved_command_line);
416 *cmdline_p = command_line;
420 void __init check_bugs(void)
428 void apply_alternatives(void *start, void *end)
433 * Overrides for Emacs so that we follow Linus's tabbing style.
434 * Emacs will notice this stuff at the end of the file and automatically
435 * adjust the settings for this buffer only. This must remain at the end
437 * ---------------------------------------------------------------------------
439 * c-file-style: "linux"