1 /* 2 * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com) 3 * Licensed under the GPL 4 */ 5 6 #include "linux/kernel.h" 7 #include "linux/sched.h" 8 #include "linux/notifier.h" 9 #include "linux/mm.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" 20 #include "linux/utsname.h" 21 #include "asm/page.h" 22 #include "asm/pgtable.h" 23 #include "asm/ptrace.h" 24 #include "asm/elf.h" 25 #include "asm/user.h" 26 #include "asm/setup.h" 27 #include "ubd_user.h" 28 #include "asm/current.h" 29 #include "kern_util.h" 30 #include "as-layout.h" 31 #include "arch.h" 32 #include "kern.h" 33 #include "mem_user.h" 34 #include "mem.h" 35 #include "initrd.h" 36 #include "init.h" 37 #include "os.h" 38 #include "choose-mode.h" 39 #include "mode_kern.h" 40 #include "mode.h" 41 #include "skas.h" 42 43 #define DEFAULT_COMMAND_LINE "root=98:0" 44 45 /* Changed in add_arg and setup_arch, which run before SMP is started */ 46 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 }; 47 48 static void __init add_arg(char *arg) 49 { 50 if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) { 51 printf("add_arg: Too many command line arguments!\n"); 52 exit(1); 53 } 54 if(strlen(command_line) > 0) 55 strcat(command_line, " "); 56 strcat(command_line, arg); 57 } 58 59 /* 60 * These fields are initialized at boot time and not changed. 61 * XXX This structure is used only in the non-SMP case. Maybe this 62 * should be moved to smp.c. 63 */ 64 struct cpuinfo_um boot_cpu_data = { 65 .loops_per_jiffy = 0, 66 .ipi_pipe = { -1, -1 } 67 }; 68 69 unsigned long thread_saved_pc(struct task_struct *task) 70 { 71 return os_process_pc(CHOOSE_MODE_PROC(thread_pid_tt, thread_pid_skas, 72 task)); 73 } 74 75 /* Changed in setup_arch, which is called in early boot */ 76 static char host_info[(__NEW_UTS_LEN + 1) * 5]; 77 78 static int show_cpuinfo(struct seq_file *m, void *v) 79 { 80 int index = 0; 81 82 #ifdef CONFIG_SMP 83 index = (struct cpuinfo_um *) v - cpu_data; 84 if (!cpu_online(index)) 85 return 0; 86 #endif 87 88 seq_printf(m, "processor\t: %d\n", index); 89 seq_printf(m, "vendor_id\t: User Mode Linux\n"); 90 seq_printf(m, "model name\t: UML\n"); 91 seq_printf(m, "mode\t\t: %s\n", CHOOSE_MODE("tt", "skas")); 92 seq_printf(m, "host\t\t: %s\n", host_info); 93 seq_printf(m, "bogomips\t: %lu.%02lu\n\n", 94 loops_per_jiffy/(500000/HZ), 95 (loops_per_jiffy/(5000/HZ)) % 100); 96 97 return 0; 98 } 99 100 static void *c_start(struct seq_file *m, loff_t *pos) 101 { 102 return *pos < NR_CPUS ? cpu_data + *pos : NULL; 103 } 104 105 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 106 { 107 ++*pos; 108 return c_start(m, pos); 109 } 110 111 static void c_stop(struct seq_file *m, void *v) 112 { 113 } 114 115 const struct seq_operations cpuinfo_op = { 116 .start = c_start, 117 .next = c_next, 118 .stop = c_stop, 119 .show = show_cpuinfo, 120 }; 121 122 /* Set in linux_main */ 123 unsigned long host_task_size; 124 unsigned long task_size; 125 unsigned long uml_physmem; 126 unsigned long uml_reserved; /* Also modified in mem_init */ 127 unsigned long start_vm; 128 unsigned long end_vm; 129 130 /* Set in uml_ncpus_setup */ 131 int ncpus = 1; 132 133 /* Set in early boot */ 134 static int have_root __initdata = 0; 135 136 /* Set in uml_mem_setup and modified in linux_main */ 137 long long physmem_size = 32 * 1024 * 1024; 138 139 static char *usage_string = 140 "User Mode Linux v%s\n" 141 " available at http://user-mode-linux.sourceforge.net/\n\n"; 142 143 static int __init uml_version_setup(char *line, int *add) 144 { 145 printf("%s\n", init_utsname()->release); 146 exit(0); 147 148 return 0; 149 } 150 151 __uml_setup("--version", uml_version_setup, 152 "--version\n" 153 " Prints the version number of the kernel.\n\n" 154 ); 155 156 static int __init uml_root_setup(char *line, int *add) 157 { 158 have_root = 1; 159 return 0; 160 } 161 162 __uml_setup("root=", uml_root_setup, 163 "root=<file containing the root fs>\n" 164 " This is actually used by the generic kernel in exactly the same\n" 165 " way as in any other kernel. If you configure a number of block\n" 166 " devices and want to boot off something other than ubd0, you \n" 167 " would use something like:\n" 168 " root=/dev/ubd5\n\n" 169 ); 170 171 static int __init no_skas_debug_setup(char *line, int *add) 172 { 173 printf("'debug' is not necessary to gdb UML in skas mode - run \n"); 174 printf("'gdb linux'"); 175 176 return 0; 177 } 178 179 __uml_setup("debug", no_skas_debug_setup, 180 "debug\n" 181 " this flag is not needed to run gdb on UML in skas mode\n\n" 182 ); 183 184 #ifdef CONFIG_SMP 185 static int __init uml_ncpus_setup(char *line, int *add) 186 { 187 if (!sscanf(line, "%d", &ncpus)) { 188 printf("Couldn't parse [%s]\n", line); 189 return -1; 190 } 191 192 return 0; 193 } 194 195 __uml_setup("ncpus=", uml_ncpus_setup, 196 "ncpus=<# of desired CPUs>\n" 197 " This tells an SMP kernel how many virtual processors to start.\n\n" 198 ); 199 #endif 200 201 static int __init Usage(char *line, int *add) 202 { 203 const char **p; 204 205 printf(usage_string, init_utsname()->release); 206 p = &__uml_help_start; 207 while (p < &__uml_help_end) { 208 printf("%s", *p); 209 p++; 210 } 211 exit(0); 212 return 0; 213 } 214 215 __uml_setup("--help", Usage, 216 "--help\n" 217 " Prints this message.\n\n" 218 ); 219 220 static int __init uml_checksetup(char *line, int *add) 221 { 222 struct uml_param *p; 223 224 p = &__uml_setup_start; 225 while(p < &__uml_setup_end) { 226 int n; 227 228 n = strlen(p->str); 229 if(!strncmp(line, p->str, n)){ 230 if (p->setup_func(line + n, add)) return 1; 231 } 232 p++; 233 } 234 return 0; 235 } 236 237 static void __init uml_postsetup(void) 238 { 239 initcall_t *p; 240 241 p = &__uml_postsetup_start; 242 while(p < &__uml_postsetup_end){ 243 (*p)(); 244 p++; 245 } 246 return; 247 } 248 249 /* Set during early boot */ 250 unsigned long brk_start; 251 unsigned long end_iomem; 252 EXPORT_SYMBOL(end_iomem); 253 254 #define MIN_VMALLOC (32 * 1024 * 1024) 255 256 extern char __binary_start; 257 258 int __init linux_main(int argc, char **argv) 259 { 260 unsigned long avail, diff; 261 unsigned long virtmem_size, max_physmem; 262 unsigned int i, add; 263 char * mode; 264 265 for (i = 1; i < argc; i++){ 266 if((i == 1) && (argv[i][0] == ' ')) continue; 267 add = 1; 268 uml_checksetup(argv[i], &add); 269 if (add) 270 add_arg(argv[i]); 271 } 272 if(have_root == 0) 273 add_arg(DEFAULT_COMMAND_LINE); 274 275 os_early_checks(); 276 277 can_do_skas(); 278 279 if (proc_mm && ptrace_faultinfo) 280 mode = "SKAS3"; 281 else 282 mode = "SKAS0"; 283 284 printf("UML running in %s mode\n", mode); 285 286 host_task_size = CHOOSE_MODE_PROC(set_task_sizes_tt, 287 set_task_sizes_skas, &task_size); 288 289 /* 290 * Setting up handlers to 'sig_info' struct 291 */ 292 os_fill_handlinfo(handlinfo_kern); 293 294 brk_start = (unsigned long) sbrk(0); 295 CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start); 296 /* Increase physical memory size for exec-shield users 297 so they actually get what they asked for. This should 298 add zero for non-exec shield users */ 299 300 diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); 301 if(diff > 1024 * 1024){ 302 printf("Adding %ld bytes to physical memory to account for " 303 "exec-shield gap\n", diff); 304 physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); 305 } 306 307 uml_physmem = (unsigned long) &__binary_start & PAGE_MASK; 308 309 /* Reserve up to 4M after the current brk */ 310 uml_reserved = ROUND_4M(brk_start) + (1 << 22); 311 312 setup_machinename(init_utsname()->machine); 313 314 highmem = 0; 315 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK; 316 max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC; 317 318 /* Zones have to begin on a 1 << MAX_ORDER page boundary, 319 * so this makes sure that's true for highmem 320 */ 321 max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1); 322 if(physmem_size + iomem_size > max_physmem){ 323 highmem = physmem_size + iomem_size - max_physmem; 324 physmem_size -= highmem; 325 #ifndef CONFIG_HIGHMEM 326 highmem = 0; 327 printf("CONFIG_HIGHMEM not enabled - physical memory shrunk " 328 "to %Lu bytes\n", physmem_size); 329 #endif 330 } 331 332 high_physmem = uml_physmem + physmem_size; 333 end_iomem = high_physmem + iomem_size; 334 high_memory = (void *) end_iomem; 335 336 start_vm = VMALLOC_START; 337 338 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem); 339 if(init_maps(physmem_size, iomem_size, highmem)){ 340 printf("Failed to allocate mem_map for %Lu bytes of physical " 341 "memory and %Lu bytes of highmem\n", physmem_size, 342 highmem); 343 exit(1); 344 } 345 346 virtmem_size = physmem_size; 347 avail = get_kmem_end() - start_vm; 348 if(physmem_size > avail) virtmem_size = avail; 349 end_vm = start_vm + virtmem_size; 350 351 if(virtmem_size < physmem_size) 352 printf("Kernel virtual memory size shrunk to %lu bytes\n", 353 virtmem_size); 354 355 uml_postsetup(); 356 357 stack_protections((unsigned long) &init_thread_info); 358 os_flush_stdout(); 359 360 return CHOOSE_MODE(start_uml_tt(), start_uml_skas()); 361 } 362 363 extern int uml_exitcode; 364 365 static int panic_exit(struct notifier_block *self, unsigned long unused1, 366 void *unused2) 367 { 368 bust_spinlocks(1); 369 show_regs(&(current->thread.regs)); 370 bust_spinlocks(0); 371 uml_exitcode = 1; 372 os_dump_core(); 373 return 0; 374 } 375 376 static struct notifier_block panic_exit_notifier = { 377 .notifier_call = panic_exit, 378 .next = NULL, 379 .priority = 0 380 }; 381 382 void __init setup_arch(char **cmdline_p) 383 { 384 atomic_notifier_chain_register(&panic_notifier_list, 385 &panic_exit_notifier); 386 paging_init(); 387 strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); 388 *cmdline_p = command_line; 389 setup_hostinfo(host_info, sizeof host_info); 390 } 391 392 void __init check_bugs(void) 393 { 394 arch_check_bugs(); 395 os_check_bugs(); 396 } 397 398 void apply_alternatives(struct alt_instr *start, struct alt_instr *end) 399 { 400 } 401 402 #ifdef CONFIG_SMP 403 void alternatives_smp_module_add(struct module *mod, char *name, 404 void *locks, void *locks_end, 405 void *text, void *text_end) 406 { 407 } 408 409 void alternatives_smp_module_del(struct module *mod) 410 { 411 } 412 #endif 413