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"
20 #include "linux/module.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"
38 #include "choose-mode.h"
39 #include "mode_kern.h"
42 #define DEFAULT_COMMAND_LINE "root=98:0"
44 /* Changed in linux_main and setup_arch, which run before SMP is started */
45 static char command_line[COMMAND_LINE_SIZE] = { 0 };
47 static void add_arg(char *arg)
49 if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
50 printf("add_arg: Too many command line arguments!\n");
53 if(strlen(command_line) > 0)
54 strcat(command_line, " ");
55 strcat(command_line, arg);
58 struct cpuinfo_um boot_cpu_data = {
60 .ipi_pipe = { -1, -1 }
63 unsigned long thread_saved_pc(struct task_struct *task)
65 return(os_process_pc(CHOOSE_MODE_PROC(thread_pid_tt, thread_pid_skas,
69 static int show_cpuinfo(struct seq_file *m, void *v)
74 index = (struct cpuinfo_um *) v - cpu_data;
75 if (!cpu_online(index))
79 seq_printf(m, "processor\t: %d\n", index);
80 seq_printf(m, "vendor_id\t: User Mode Linux\n");
81 seq_printf(m, "model name\t: UML\n");
82 seq_printf(m, "mode\t\t: %s\n", CHOOSE_MODE("tt", "skas"));
83 seq_printf(m, "host\t\t: %s\n", host_info);
84 seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
85 loops_per_jiffy/(500000/HZ),
86 (loops_per_jiffy/(5000/HZ)) % 100);
91 static void *c_start(struct seq_file *m, loff_t *pos)
93 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
96 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
99 return c_start(m, pos);
102 static void c_stop(struct seq_file *m, void *v)
106 struct seq_operations cpuinfo_op = {
110 .show = show_cpuinfo,
113 /* Set in linux_main */
114 unsigned long host_task_size;
115 unsigned long task_size;
117 unsigned long uml_start;
119 /* Set in early boot */
120 unsigned long uml_physmem;
121 unsigned long uml_reserved;
122 unsigned long start_vm;
123 unsigned long end_vm;
126 #ifdef CONFIG_MODE_TT
127 /* Pointer set in linux_main, the array itself is private to each thread,
128 * and changed at address space creation time so this poses no concurrency
131 static char *argv1_begin = NULL;
132 static char *argv1_end = NULL;
135 /* Set in early boot */
136 static int have_root __initdata = 0;
137 long physmem_size = 32 * 1024 * 1024;
139 void set_cmdline(char *cmd)
141 #ifdef CONFIG_MODE_TT
144 if(CHOOSE_MODE(honeypot, 0)) return;
148 snprintf(argv1_begin,
149 (argv1_end - argv1_begin) * sizeof(*ptr),
151 ptr = &argv1_begin[strlen(argv1_begin)];
153 else ptr = argv1_begin;
155 snprintf(ptr, (argv1_end - ptr) * sizeof(*ptr), "[%s]", cmd);
156 memset(argv1_begin + strlen(argv1_begin), '\0',
157 argv1_end - argv1_begin - strlen(argv1_begin));
161 static char *usage_string =
162 "User Mode Linux v%s\n"
163 " available at http://user-mode-linux.sourceforge.net/\n\n";
165 static int __init uml_version_setup(char *line, int *add)
167 printf("%s\n", system_utsname.release);
173 __uml_setup("--version", uml_version_setup,
175 " Prints the version number of the kernel.\n\n"
178 static int __init uml_root_setup(char *line, int *add)
184 __uml_setup("root=", uml_root_setup,
185 "root=<file containing the root fs>\n"
186 " This is actually used by the generic kernel in exactly the same\n"
187 " way as in any other kernel. If you configure a number of block\n"
188 " devices and want to boot off something other than ubd0, you \n"
189 " would use something like:\n"
190 " root=/dev/ubd5\n\n"
194 static int __init uml_ncpus_setup(char *line, int *add)
196 if (!sscanf(line, "%d", &ncpus)) {
197 printf("Couldn't parse [%s]\n", line);
204 __uml_setup("ncpus=", uml_ncpus_setup,
205 "ncpus=<# of desired CPUs>\n"
206 " This tells an SMP kernel how many virtual processors to start.\n\n"
210 static int force_tt = 0;
212 #if defined(CONFIG_MODE_TT) && defined(CONFIG_MODE_SKAS)
215 static int __init mode_tt_setup(char *line, int *add)
222 #ifdef CONFIG_MODE_SKAS
226 static int __init mode_tt_setup(char *line, int *add)
228 printf("CONFIG_MODE_TT disabled - 'mode=tt' ignored\n");
233 #ifdef CONFIG_MODE_TT
237 static int __init mode_tt_setup(char *line, int *add)
239 printf("CONFIG_MODE_SKAS disabled - 'mode=tt' redundant\n");
245 #error Either CONFIG_MODE_TT or CONFIG_MODE_SKAS must be enabled
251 __uml_setup("mode=tt", mode_tt_setup,
253 " When both CONFIG_MODE_TT and CONFIG_MODE_SKAS are enabled, this option\n"
254 " forces UML to run in tt (tracing thread) mode. It is not the default\n"
255 " because it's slower and less secure than skas mode.\n\n"
258 int mode_tt = DEFAULT_TT;
260 static int __init Usage(char *line, int *add)
264 printf(usage_string, system_utsname.release);
265 p = &__uml_help_start;
266 while (p < &__uml_help_end) {
275 __uml_setup("--help", Usage,
277 " Prints this message.\n\n"
280 static int __init uml_checksetup(char *line, int *add)
284 p = &__uml_setup_start;
285 while(p < &__uml_setup_end) {
289 if(!strncmp(line, p->str, n)){
290 if (p->setup_func(line + n, add)) return 1;
297 static void __init uml_postsetup(void)
301 p = &__uml_postsetup_start;
302 while(p < &__uml_postsetup_end){
309 /* Set during early boot */
310 unsigned long brk_start;
311 unsigned long end_iomem;
312 EXPORT_SYMBOL(end_iomem);
314 #define MIN_VMALLOC (32 * 1024 * 1024)
316 int linux_main(int argc, char **argv)
318 unsigned long avail, diff;
319 unsigned long virtmem_size, max_physmem;
322 for (i = 1; i < argc; i++){
323 if((i == 1) && (argv[i][0] == ' ')) continue;
325 uml_checksetup(argv[i], &add);
330 add_arg(DEFAULT_COMMAND_LINE);
332 mode_tt = force_tt ? 1 : !can_do_skas();
333 #ifndef CONFIG_MODE_TT
335 /*Since CONFIG_MODE_TT is #undef'ed, force_tt cannot be 1. So,
336 * can_do_skas() returned 0, and the message is correct. */
337 printf("Support for TT mode is disabled, and no SKAS support is present on the host.\n");
341 uml_start = CHOOSE_MODE_PROC(set_task_sizes_tt, set_task_sizes_skas, 0,
342 &host_task_size, &task_size);
344 /* Need to check this early because mmapping happens before the
349 brk_start = (unsigned long) sbrk(0);
350 CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start);
351 /* Increase physical memory size for exec-shield users
352 so they actually get what they asked for. This should
353 add zero for non-exec shield users */
355 diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
356 if(diff > 1024 * 1024){
357 printf("Adding %ld bytes to physical memory to account for "
358 "exec-shield gap\n", diff);
359 physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
362 uml_physmem = uml_start;
364 /* Reserve up to 4M after the current brk */
365 uml_reserved = ROUND_4M(brk_start) + (1 << 22);
367 setup_machinename(system_utsname.machine);
369 #ifdef CONFIG_MODE_TT
370 argv1_begin = argv[1];
371 argv1_end = &argv[1][strlen(argv[1])];
375 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
376 max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC;
378 /* Zones have to begin on a 1 << MAX_ORDER page boundary,
379 * so this makes sure that's true for highmem
381 max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
382 if(physmem_size + iomem_size > max_physmem){
383 highmem = physmem_size + iomem_size - max_physmem;
384 physmem_size -= highmem;
385 #ifndef CONFIG_HIGHMEM
387 printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
388 "to %ld bytes\n", physmem_size);
392 high_physmem = uml_physmem + physmem_size;
393 end_iomem = high_physmem + iomem_size;
394 high_memory = (void *) end_iomem;
396 start_vm = VMALLOC_START;
398 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
399 if(init_maps(physmem_size, iomem_size, highmem)){
400 printf("Failed to allocate mem_map for %ld bytes of physical "
401 "memory and %ld bytes of highmem\n", physmem_size,
406 virtmem_size = physmem_size;
407 avail = get_kmem_end() - start_vm;
408 if(physmem_size > avail) virtmem_size = avail;
409 end_vm = start_vm + virtmem_size;
411 if(virtmem_size < physmem_size)
412 printf("Kernel virtual memory size shrunk to %ld bytes\n",
417 task_protections((unsigned long) &init_thread_info);
420 return(CHOOSE_MODE(start_uml_tt(), start_uml_skas()));
423 extern int uml_exitcode;
425 static int panic_exit(struct notifier_block *self, unsigned long unused1,
429 show_regs(&(current->thread.regs));
436 static struct notifier_block panic_exit_notifier = {
437 .notifier_call = panic_exit,
442 void __init setup_arch(char **cmdline_p)
444 notifier_chain_register(&panic_notifier_list, &panic_exit_notifier);
446 strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
447 *cmdline_p = command_line;
451 void __init check_bugs(void)
459 void apply_alternatives(void *start, void *end)