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"
21 #include "asm/pgtable.h"
22 #include "asm/ptrace.h"
25 #include "asm/setup.h"
27 #include "asm/current.h"
28 #include "user_util.h"
29 #include "kern_util.h"
36 #include "choose-mode.h"
37 #include "mode_kern.h"
39 #ifdef UML_CONFIG_MODE_SKAS
43 #define DEFAULT_COMMAND_LINE "root=98:0"
45 /* Changed in linux_main and setup_arch, which run before SMP is started */
46 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
48 static void __init add_arg(char *arg)
50 if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
51 printf("add_arg: Too many command line arguments!\n");
54 if(strlen(command_line) > 0)
55 strcat(command_line, " ");
56 strcat(command_line, arg);
59 struct cpuinfo_um boot_cpu_data = {
61 .ipi_pipe = { -1, -1 }
64 unsigned long thread_saved_pc(struct task_struct *task)
66 return os_process_pc(CHOOSE_MODE_PROC(thread_pid_tt, thread_pid_skas,
70 static int show_cpuinfo(struct seq_file *m, void *v)
75 index = (struct cpuinfo_um *) v - cpu_data;
76 if (!cpu_online(index))
80 seq_printf(m, "processor\t: %d\n", index);
81 seq_printf(m, "vendor_id\t: User Mode Linux\n");
82 seq_printf(m, "model name\t: UML\n");
83 seq_printf(m, "mode\t\t: %s\n", CHOOSE_MODE("tt", "skas"));
84 seq_printf(m, "host\t\t: %s\n", host_info);
85 seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
86 loops_per_jiffy/(500000/HZ),
87 (loops_per_jiffy/(5000/HZ)) % 100);
92 static void *c_start(struct seq_file *m, loff_t *pos)
94 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
97 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
100 return c_start(m, pos);
103 static void c_stop(struct seq_file *m, void *v)
107 const struct seq_operations cpuinfo_op = {
111 .show = show_cpuinfo,
114 /* Set in linux_main */
115 unsigned long host_task_size;
116 unsigned long task_size;
118 unsigned long uml_start;
120 /* Set in early boot */
121 unsigned long uml_physmem;
122 unsigned long uml_reserved;
123 unsigned long start_vm;
124 unsigned long end_vm;
127 #ifdef CONFIG_CMDLINE_ON_HOST
128 /* Pointer set in linux_main, the array itself is private to each thread,
129 * and changed at address space creation time so this poses no concurrency
132 static char *argv1_begin = NULL;
133 static char *argv1_end = NULL;
136 /* Set in early boot */
137 static int have_root __initdata = 0;
138 long long physmem_size = 32 * 1024 * 1024;
140 void set_cmdline(char *cmd)
142 #ifdef CONFIG_CMDLINE_ON_HOST
145 if(CHOOSE_MODE(honeypot, 0)) return;
149 snprintf(argv1_begin,
150 (argv1_end - argv1_begin) * sizeof(*ptr),
152 ptr = &argv1_begin[strlen(argv1_begin)];
154 else ptr = argv1_begin;
156 snprintf(ptr, (argv1_end - ptr) * sizeof(*ptr), "[%s]", cmd);
157 memset(argv1_begin + strlen(argv1_begin), '\0',
158 argv1_end - argv1_begin - strlen(argv1_begin));
162 static char *usage_string =
163 "User Mode Linux v%s\n"
164 " available at http://user-mode-linux.sourceforge.net/\n\n";
166 static int __init uml_version_setup(char *line, int *add)
168 printf("%s\n", init_utsname()->release);
174 __uml_setup("--version", uml_version_setup,
176 " Prints the version number of the kernel.\n\n"
179 static int __init uml_root_setup(char *line, int *add)
185 __uml_setup("root=", uml_root_setup,
186 "root=<file containing the root fs>\n"
187 " This is actually used by the generic kernel in exactly the same\n"
188 " way as in any other kernel. If you configure a number of block\n"
189 " devices and want to boot off something other than ubd0, you \n"
190 " would use something like:\n"
191 " root=/dev/ubd5\n\n"
194 #ifndef CONFIG_MODE_TT
196 static int __init no_skas_debug_setup(char *line, int *add)
198 printf("'debug' is not necessary to gdb UML in skas mode - run \n");
199 printf("'gdb linux' and disable CONFIG_CMDLINE_ON_HOST if gdb \n");
200 printf("doesn't work as expected\n");
205 __uml_setup("debug", no_skas_debug_setup,
207 " this flag is not needed to run gdb on UML in skas mode\n\n"
213 static int __init uml_ncpus_setup(char *line, int *add)
215 if (!sscanf(line, "%d", &ncpus)) {
216 printf("Couldn't parse [%s]\n", line);
223 __uml_setup("ncpus=", uml_ncpus_setup,
224 "ncpus=<# of desired CPUs>\n"
225 " This tells an SMP kernel how many virtual processors to start.\n\n"
229 static int force_tt = 0;
231 #if defined(CONFIG_MODE_TT) && defined(CONFIG_MODE_SKAS)
234 static int __init mode_tt_setup(char *line, int *add)
241 #ifdef CONFIG_MODE_SKAS
245 static int __init mode_tt_setup(char *line, int *add)
247 printf("CONFIG_MODE_TT disabled - 'mode=tt' ignored\n");
252 #ifdef CONFIG_MODE_TT
256 static int __init mode_tt_setup(char *line, int *add)
258 printf("CONFIG_MODE_SKAS disabled - 'mode=tt' redundant\n");
266 __uml_setup("mode=tt", mode_tt_setup,
268 " When both CONFIG_MODE_TT and CONFIG_MODE_SKAS are enabled, this option\n"
269 " forces UML to run in tt (tracing thread) mode. It is not the default\n"
270 " because it's slower and less secure than skas mode.\n\n"
273 int mode_tt = DEFAULT_TT;
275 static int __init Usage(char *line, int *add)
279 printf(usage_string, init_utsname()->release);
280 p = &__uml_help_start;
281 while (p < &__uml_help_end) {
289 __uml_setup("--help", Usage,
291 " Prints this message.\n\n"
294 static int __init uml_checksetup(char *line, int *add)
298 p = &__uml_setup_start;
299 while(p < &__uml_setup_end) {
303 if(!strncmp(line, p->str, n)){
304 if (p->setup_func(line + n, add)) return 1;
311 static void __init uml_postsetup(void)
315 p = &__uml_postsetup_start;
316 while(p < &__uml_postsetup_end){
323 /* Set during early boot */
324 unsigned long brk_start;
325 unsigned long end_iomem;
326 EXPORT_SYMBOL(end_iomem);
328 #define MIN_VMALLOC (32 * 1024 * 1024)
330 extern char __binary_start;
332 int __init linux_main(int argc, char **argv)
334 unsigned long avail, diff;
335 unsigned long virtmem_size, max_physmem;
339 for (i = 1; i < argc; i++){
340 if((i == 1) && (argv[i][0] == ' ')) continue;
342 uml_checksetup(argv[i], &add);
347 add_arg(DEFAULT_COMMAND_LINE);
352 mode_tt = force_tt ? 1 : !can_do_skas();
353 #ifndef CONFIG_MODE_TT
355 /*Since CONFIG_MODE_TT is #undef'ed, force_tt cannot be 1. So,
356 * can_do_skas() returned 0, and the message is correct. */
357 printf("Support for TT mode is disabled, and no SKAS support is present on the host.\n");
362 #ifndef CONFIG_MODE_SKAS
365 /* Show to the user the result of selection */
368 else if (proc_mm && ptrace_faultinfo)
374 printf("UML running in %s mode\n", mode);
376 uml_start = (unsigned long) &__binary_start;
377 host_task_size = CHOOSE_MODE_PROC(set_task_sizes_tt,
378 set_task_sizes_skas, &task_size);
381 * Setting up handlers to 'sig_info' struct
383 os_fill_handlinfo(handlinfo_kern);
385 brk_start = (unsigned long) sbrk(0);
386 CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start);
387 /* Increase physical memory size for exec-shield users
388 so they actually get what they asked for. This should
389 add zero for non-exec shield users */
391 diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
392 if(diff > 1024 * 1024){
393 printf("Adding %ld bytes to physical memory to account for "
394 "exec-shield gap\n", diff);
395 physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
398 uml_physmem = uml_start & PAGE_MASK;
400 /* Reserve up to 4M after the current brk */
401 uml_reserved = ROUND_4M(brk_start) + (1 << 22);
403 setup_machinename(init_utsname()->machine);
405 #ifdef CONFIG_CMDLINE_ON_HOST
406 argv1_begin = argv[1];
407 argv1_end = &argv[1][strlen(argv[1])];
411 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
412 max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC;
414 /* Zones have to begin on a 1 << MAX_ORDER page boundary,
415 * so this makes sure that's true for highmem
417 max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
418 if(physmem_size + iomem_size > max_physmem){
419 highmem = physmem_size + iomem_size - max_physmem;
420 physmem_size -= highmem;
421 #ifndef CONFIG_HIGHMEM
423 printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
424 "to %Lu bytes\n", physmem_size);
428 high_physmem = uml_physmem + physmem_size;
429 end_iomem = high_physmem + iomem_size;
430 high_memory = (void *) end_iomem;
432 start_vm = VMALLOC_START;
434 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
435 if(init_maps(physmem_size, iomem_size, highmem)){
436 printf("Failed to allocate mem_map for %Lu bytes of physical "
437 "memory and %Lu bytes of highmem\n", physmem_size,
442 virtmem_size = physmem_size;
443 avail = get_kmem_end() - start_vm;
444 if(physmem_size > avail) virtmem_size = avail;
445 end_vm = start_vm + virtmem_size;
447 if(virtmem_size < physmem_size)
448 printf("Kernel virtual memory size shrunk to %lu bytes\n",
453 task_protections((unsigned long) &init_thread_info);
456 return CHOOSE_MODE(start_uml_tt(), start_uml_skas());
459 extern int uml_exitcode;
461 static int panic_exit(struct notifier_block *self, unsigned long unused1,
465 show_regs(&(current->thread.regs));
472 static struct notifier_block panic_exit_notifier = {
473 .notifier_call = panic_exit,
478 void __init setup_arch(char **cmdline_p)
480 atomic_notifier_chain_register(&panic_notifier_list,
481 &panic_exit_notifier);
483 strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
484 *cmdline_p = command_line;
488 void __init check_bugs(void)
494 void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
499 void alternatives_smp_module_add(struct module *mod, char *name,
500 void *locks, void *locks_end,
501 void *text, void *text_end)
505 void alternatives_smp_module_del(struct module *mod)