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"
36 #include "choose-mode.h"
37 #include "mode_kern.h"
40 #define DEFAULT_COMMAND_LINE "root=98:0"
42 struct cpuinfo_um boot_cpu_data = {
44 .ipi_pipe = { -1, -1 }
47 /* Placeholder to make UML link until the vsyscall stuff is actually
50 void *__kernel_vsyscall;
52 unsigned long thread_saved_pc(struct task_struct *task)
54 return(os_process_pc(CHOOSE_MODE_PROC(thread_pid_tt, thread_pid_skas,
58 static int show_cpuinfo(struct seq_file *m, void *v)
63 index = (struct cpuinfo_um *) v - cpu_data;
64 if (!cpu_online(index))
68 seq_printf(m, "processor\t: %d\n", index);
69 seq_printf(m, "vendor_id\t: User Mode Linux\n");
70 seq_printf(m, "model name\t: UML\n");
71 seq_printf(m, "mode\t\t: %s\n", CHOOSE_MODE("tt", "skas"));
72 seq_printf(m, "host\t\t: %s\n", host_info);
73 seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
74 loops_per_jiffy/(500000/HZ),
75 (loops_per_jiffy/(5000/HZ)) % 100);
80 static void *c_start(struct seq_file *m, loff_t *pos)
82 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
85 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
88 return c_start(m, pos);
91 static void c_stop(struct seq_file *m, void *v)
95 struct seq_operations cpuinfo_op = {
102 pte_t * __bad_pagetable(void)
104 panic("Someone should implement __bad_pagetable");
108 /* Set in linux_main */
109 unsigned long host_task_size;
110 unsigned long task_size;
112 unsigned long uml_start;
114 /* Set in early boot */
115 unsigned long uml_physmem;
116 unsigned long uml_reserved;
117 unsigned long start_vm;
118 unsigned long end_vm;
121 #ifdef CONFIG_MODE_TT
122 /* Pointer set in linux_main, the array itself is private to each thread,
123 * and changed at address space creation time so this poses no concurrency
126 static char *argv1_begin = NULL;
127 static char *argv1_end = NULL;
130 /* Set in early boot */
131 static int have_root __initdata = 0;
132 long physmem_size = 32 * 1024 * 1024;
134 void set_cmdline(char *cmd)
136 #ifdef CONFIG_MODE_TT
139 if(CHOOSE_MODE(honeypot, 0)) return;
143 snprintf(argv1_begin,
144 (argv1_end - argv1_begin) * sizeof(*ptr),
146 ptr = &argv1_begin[strlen(argv1_begin)];
148 else ptr = argv1_begin;
150 snprintf(ptr, (argv1_end - ptr) * sizeof(*ptr), "[%s]", cmd);
151 memset(argv1_begin + strlen(argv1_begin), '\0',
152 argv1_end - argv1_begin - strlen(argv1_begin));
156 static char *usage_string =
157 "User Mode Linux v%s\n"
158 " available at http://user-mode-linux.sourceforge.net/\n\n";
160 static int __init uml_version_setup(char *line, int *add)
162 printf("%s\n", system_utsname.release);
166 __uml_setup("--version", uml_version_setup,
168 " Prints the version number of the kernel.\n\n"
171 static int __init uml_root_setup(char *line, int *add)
177 __uml_setup("root=", uml_root_setup,
178 "root=<file containing the root fs>\n"
179 " This is actually used by the generic kernel in exactly the same\n"
180 " way as in any other kernel. If you configure a number of block\n"
181 " devices and want to boot off something other than ubd0, you \n"
182 " would use something like:\n"
183 " root=/dev/ubd5\n\n"
187 static int __init uml_ncpus_setup(char *line, int *add)
189 if (!sscanf(line, "%d", &ncpus)) {
190 printf("Couldn't parse [%s]\n", line);
197 __uml_setup("ncpus=", uml_ncpus_setup,
198 "ncpus=<# of desired CPUs>\n"
199 " This tells an SMP kernel how many virtual processors to start.\n\n"
205 #if defined(CONFIG_MODE_TT) && defined(CONFIG_MODE_SKAS)
208 static int __init mode_tt_setup(char *line, int *add)
215 #ifdef CONFIG_MODE_SKAS
219 static int __init mode_tt_setup(char *line, int *add)
221 printf("CONFIG_MODE_TT disabled - 'mode=tt' ignored\n");
226 #ifdef CONFIG_MODE_TT
230 static int __init mode_tt_setup(char *line, int *add)
232 printf("CONFIG_MODE_SKAS disabled - 'mode=tt' redundant\n");
238 #error Either CONFIG_MODE_TT or CONFIG_MODE_SKAS must be enabled
244 __uml_setup("mode=tt", mode_tt_setup,
246 " When both CONFIG_MODE_TT and CONFIG_MODE_SKAS are enabled, this option\n"
247 " forces UML to run in tt (tracing thread) mode. It is not the default\n"
248 " because it's slower and less secure than skas mode.\n\n"
251 int mode_tt = DEFAULT_TT;
253 static int __init Usage(char *line, int *add)
257 printf(usage_string, system_utsname.release);
258 p = &__uml_help_start;
259 while (p < &__uml_help_end) {
266 __uml_setup("--help", Usage,
268 " Prints this message.\n\n"
271 static int __init uml_checksetup(char *line, int *add)
275 p = &__uml_setup_start;
276 while(p < &__uml_setup_end) {
280 if(!strncmp(line, p->str, n)){
281 if (p->setup_func(line + n, add)) return 1;
288 static void __init uml_postsetup(void)
292 p = &__uml_postsetup_start;
293 while(p < &__uml_postsetup_end){
300 /* Set during early boot */
301 unsigned long brk_start;
302 unsigned long end_iomem;
304 #define MIN_VMALLOC (32 * 1024 * 1024)
306 int linux_main(int argc, char **argv)
308 unsigned long avail, diff;
309 unsigned long virtmem_size, max_physmem;
312 for (i = 1; i < argc; i++){
313 if((i == 1) && (argv[i][0] == ' ')) continue;
315 uml_checksetup(argv[i], &add);
316 if(add) add_arg(saved_command_line, argv[i]);
318 if(have_root == 0) add_arg(saved_command_line, DEFAULT_COMMAND_LINE);
320 mode_tt = force_tt ? 1 : !can_do_skas();
321 uml_start = CHOOSE_MODE_PROC(set_task_sizes_tt, set_task_sizes_skas, 0,
322 &host_task_size, &task_size);
324 brk_start = (unsigned long) sbrk(0);
325 CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start);
326 /* Increase physical memory size for exec-shield users
327 so they actually get what they asked for. This should
328 add zero for non-exec shield users */
330 diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
331 if(diff > 1024 * 1024){
332 printf("Adding %ld bytes to physical memory to account for "
333 "exec-shield gap\n", diff);
334 physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
337 uml_physmem = uml_start;
339 /* Reserve up to 4M after the current brk */
340 uml_reserved = ROUND_4M(brk_start) + (1 << 22);
342 setup_machinename(system_utsname.machine);
344 #ifdef CONFIG_MODE_TT
345 argv1_begin = argv[1];
346 argv1_end = &argv[1][strlen(argv[1])];
350 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
351 max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC;
353 /* Zones have to begin on a 1 << MAX_ORDER page boundary,
354 * so this makes sure that's true for highmem
356 max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
357 if(physmem_size + iomem_size > max_physmem){
358 highmem = physmem_size + iomem_size - max_physmem;
359 physmem_size -= highmem;
360 #ifndef CONFIG_HIGHMEM
362 printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
363 "to %ld bytes\n", physmem_size);
367 high_physmem = uml_physmem + physmem_size;
368 end_iomem = high_physmem + iomem_size;
369 high_memory = (void *) end_iomem;
371 start_vm = VMALLOC_START;
373 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
374 if(init_maps(physmem_size, iomem_size, highmem)){
375 printf("Failed to allocate mem_map for %ld bytes of physical "
376 "memory and %ld bytes of highmem\n", physmem_size,
381 virtmem_size = physmem_size;
382 avail = get_kmem_end() - start_vm;
383 if(physmem_size > avail) virtmem_size = avail;
384 end_vm = start_vm + virtmem_size;
386 if(virtmem_size < physmem_size)
387 printf("Kernel virtual memory size shrunk to %ld bytes\n",
392 task_protections((unsigned long) &init_thread_info);
395 return(CHOOSE_MODE(start_uml_tt(), start_uml_skas()));
398 extern int uml_exitcode;
400 static int panic_exit(struct notifier_block *self, unsigned long unused1,
403 #ifdef CONFIG_MAGIC_SYSRQ
404 handle_sysrq('p', ¤t->thread.regs, NULL);
411 static struct notifier_block panic_exit_notifier = {
412 .notifier_call = panic_exit,
417 void __init setup_arch(char **cmdline_p)
419 notifier_chain_register(&panic_notifier_list, &panic_exit_notifier);
421 strcpy(command_line, saved_command_line);
422 *cmdline_p = command_line;
426 void __init check_bugs(void)
434 void apply_alternatives(void *start, void *end)
439 * Overrides for Emacs so that we follow Linus's tabbing style.
440 * Emacs will notice this stuff at the end of the file and automatically
441 * adjust the settings for this buffer only. This must remain at the end
443 * ---------------------------------------------------------------------------
445 * c-file-style: "linux"