1 /* 2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 3 * Licensed under the GPL 4 */ 5 6 #include "linux/delay.h" 7 #include "linux/mm.h" 8 #include "linux/module.h" 9 #include "linux/seq_file.h" 10 #include "linux/string.h" 11 #include "linux/utsname.h" 12 #include "asm/pgtable.h" 13 #include "asm/processor.h" 14 #include "asm/setup.h" 15 #include "arch.h" 16 #include "as-layout.h" 17 #include "init.h" 18 #include "kern.h" 19 #include "mem_user.h" 20 #include "os.h" 21 #include "skas.h" 22 23 #define DEFAULT_COMMAND_LINE "root=98:0" 24 25 /* Changed in add_arg and setup_arch, which run before SMP is started */ 26 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 }; 27 28 static void __init add_arg(char *arg) 29 { 30 if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) { 31 printf("add_arg: Too many command line arguments!\n"); 32 exit(1); 33 } 34 if (strlen(command_line) > 0) 35 strcat(command_line, " "); 36 strcat(command_line, arg); 37 } 38 39 /* 40 * These fields are initialized at boot time and not changed. 41 * XXX This structure is used only in the non-SMP case. Maybe this 42 * should be moved to smp.c. 43 */ 44 struct cpuinfo_um boot_cpu_data = { 45 .loops_per_jiffy = 0, 46 .ipi_pipe = { -1, -1 } 47 }; 48 49 unsigned long thread_saved_pc(struct task_struct *task) 50 { 51 /* FIXME: Need to look up userspace_pid by cpu */ 52 return os_process_pc(userspace_pid[0]); 53 } 54 55 /* Changed in setup_arch, which is called in early boot */ 56 static char host_info[(__NEW_UTS_LEN + 1) * 5]; 57 58 static int show_cpuinfo(struct seq_file *m, void *v) 59 { 60 int index = 0; 61 62 #ifdef CONFIG_SMP 63 index = (struct cpuinfo_um *) v - cpu_data; 64 if (!cpu_online(index)) 65 return 0; 66 #endif 67 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: skas\n"); 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); 76 77 return 0; 78 } 79 80 static void *c_start(struct seq_file *m, loff_t *pos) 81 { 82 return *pos < NR_CPUS ? cpu_data + *pos : NULL; 83 } 84 85 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 86 { 87 ++*pos; 88 return c_start(m, pos); 89 } 90 91 static void c_stop(struct seq_file *m, void *v) 92 { 93 } 94 95 const struct seq_operations cpuinfo_op = { 96 .start = c_start, 97 .next = c_next, 98 .stop = c_stop, 99 .show = show_cpuinfo, 100 }; 101 102 /* Set in linux_main */ 103 unsigned long host_task_size; 104 unsigned long task_size; 105 unsigned long uml_physmem; 106 unsigned long uml_reserved; /* Also modified in mem_init */ 107 unsigned long start_vm; 108 unsigned long end_vm; 109 110 /* Set in uml_ncpus_setup */ 111 int ncpus = 1; 112 113 /* Set in early boot */ 114 static int have_root __initdata = 0; 115 116 /* Set in uml_mem_setup and modified in linux_main */ 117 long long physmem_size = 32 * 1024 * 1024; 118 119 static char *usage_string = 120 "User Mode Linux v%s\n" 121 " available at http://user-mode-linux.sourceforge.net/\n\n"; 122 123 static int __init uml_version_setup(char *line, int *add) 124 { 125 printf("%s\n", init_utsname()->release); 126 exit(0); 127 128 return 0; 129 } 130 131 __uml_setup("--version", uml_version_setup, 132 "--version\n" 133 " Prints the version number of the kernel.\n\n" 134 ); 135 136 static int __init uml_root_setup(char *line, int *add) 137 { 138 have_root = 1; 139 return 0; 140 } 141 142 __uml_setup("root=", uml_root_setup, 143 "root=<file containing the root fs>\n" 144 " This is actually used by the generic kernel in exactly the same\n" 145 " way as in any other kernel. If you configure a number of block\n" 146 " devices and want to boot off something other than ubd0, you \n" 147 " would use something like:\n" 148 " root=/dev/ubd5\n\n" 149 ); 150 151 static int __init no_skas_debug_setup(char *line, int *add) 152 { 153 printf("'debug' is not necessary to gdb UML in skas mode - run \n"); 154 printf("'gdb linux'"); 155 156 return 0; 157 } 158 159 __uml_setup("debug", no_skas_debug_setup, 160 "debug\n" 161 " this flag is not needed to run gdb on UML in skas mode\n\n" 162 ); 163 164 #ifdef CONFIG_SMP 165 static int __init uml_ncpus_setup(char *line, int *add) 166 { 167 if (!sscanf(line, "%d", &ncpus)) { 168 printf("Couldn't parse [%s]\n", line); 169 return -1; 170 } 171 172 return 0; 173 } 174 175 __uml_setup("ncpus=", uml_ncpus_setup, 176 "ncpus=<# of desired CPUs>\n" 177 " This tells an SMP kernel how many virtual processors to start.\n\n" 178 ); 179 #endif 180 181 static int __init Usage(char *line, int *add) 182 { 183 const char **p; 184 185 printf(usage_string, init_utsname()->release); 186 p = &__uml_help_start; 187 while (p < &__uml_help_end) { 188 printf("%s", *p); 189 p++; 190 } 191 exit(0); 192 return 0; 193 } 194 195 __uml_setup("--help", Usage, 196 "--help\n" 197 " Prints this message.\n\n" 198 ); 199 200 static int __init uml_checksetup(char *line, int *add) 201 { 202 struct uml_param *p; 203 204 p = &__uml_setup_start; 205 while(p < &__uml_setup_end) { 206 int n; 207 208 n = strlen(p->str); 209 if (!strncmp(line, p->str, n) && p->setup_func(line + n, add)) 210 return 1; 211 p++; 212 } 213 return 0; 214 } 215 216 static void __init uml_postsetup(void) 217 { 218 initcall_t *p; 219 220 p = &__uml_postsetup_start; 221 while(p < &__uml_postsetup_end) { 222 (*p)(); 223 p++; 224 } 225 return; 226 } 227 228 /* Set during early boot */ 229 unsigned long brk_start; 230 unsigned long end_iomem; 231 EXPORT_SYMBOL(end_iomem); 232 233 #define MIN_VMALLOC (32 * 1024 * 1024) 234 235 extern char __binary_start; 236 237 static unsigned long set_task_sizes_skas(unsigned long *task_size_out) 238 { 239 /* Round up to the nearest 4M */ 240 unsigned long host_task_size = ROUND_4M((unsigned long) 241 &host_task_size); 242 243 if (!skas_needs_stub) 244 *task_size_out = host_task_size; 245 else 246 *task_size_out = STUB_START & PGDIR_MASK; 247 248 return host_task_size; 249 } 250 251 int __init linux_main(int argc, char **argv) 252 { 253 unsigned long avail, diff; 254 unsigned long virtmem_size, max_physmem; 255 unsigned int i, add; 256 char * mode; 257 258 for (i = 1; i < argc; i++) { 259 if ((i == 1) && (argv[i][0] == ' ')) 260 continue; 261 add = 1; 262 uml_checksetup(argv[i], &add); 263 if (add) 264 add_arg(argv[i]); 265 } 266 if (have_root == 0) 267 add_arg(DEFAULT_COMMAND_LINE); 268 269 /* OS sanity checks that need to happen before the kernel runs */ 270 os_early_checks(); 271 272 can_do_skas(); 273 274 if (proc_mm && ptrace_faultinfo) 275 mode = "SKAS3"; 276 else 277 mode = "SKAS0"; 278 279 printf("UML running in %s mode\n", mode); 280 281 host_task_size = set_task_sizes_skas(&task_size); 282 283 /* 284 * Setting up handlers to 'sig_info' struct 285 */ 286 os_fill_handlinfo(handlinfo_kern); 287 288 brk_start = (unsigned long) sbrk(0); 289 290 /* 291 * Increase physical memory size for exec-shield users 292 * so they actually get what they asked for. This should 293 * add zero for non-exec shield users 294 */ 295 296 diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); 297 if (diff > 1024 * 1024) { 298 printf("Adding %ld bytes to physical memory to account for " 299 "exec-shield gap\n", diff); 300 physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); 301 } 302 303 uml_physmem = (unsigned long) &__binary_start & PAGE_MASK; 304 305 /* Reserve up to 4M after the current brk */ 306 uml_reserved = ROUND_4M(brk_start) + (1 << 22); 307 308 setup_machinename(init_utsname()->machine); 309 310 highmem = 0; 311 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK; 312 max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC; 313 314 /* 315 * Zones have to begin on a 1 << MAX_ORDER page boundary, 316 * so this makes sure that's true for highmem 317 */ 318 max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1); 319 if (physmem_size + iomem_size > max_physmem) { 320 highmem = physmem_size + iomem_size - max_physmem; 321 physmem_size -= highmem; 322 #ifndef CONFIG_HIGHMEM 323 highmem = 0; 324 printf("CONFIG_HIGHMEM not enabled - physical memory shrunk " 325 "to %Lu bytes\n", physmem_size); 326 #endif 327 } 328 329 high_physmem = uml_physmem + physmem_size; 330 end_iomem = high_physmem + iomem_size; 331 high_memory = (void *) end_iomem; 332 333 start_vm = VMALLOC_START; 334 335 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem); 336 if (init_maps(physmem_size, iomem_size, highmem)) { 337 printf("Failed to allocate mem_map for %Lu bytes of physical " 338 "memory and %Lu bytes of highmem\n", physmem_size, 339 highmem); 340 exit(1); 341 } 342 343 virtmem_size = physmem_size; 344 avail = get_kmem_end() - start_vm; 345 if (physmem_size > avail) 346 virtmem_size = avail; 347 end_vm = start_vm + virtmem_size; 348 349 if (virtmem_size < physmem_size) 350 printf("Kernel virtual memory size shrunk to %lu bytes\n", 351 virtmem_size); 352 353 uml_postsetup(); 354 355 stack_protections((unsigned long) &init_thread_info); 356 os_flush_stdout(); 357 358 return start_uml(); 359 } 360 361 extern int uml_exitcode; 362 363 static int panic_exit(struct notifier_block *self, unsigned long unused1, 364 void *unused2) 365 { 366 bust_spinlocks(1); 367 show_regs(&(current->thread.regs)); 368 bust_spinlocks(0); 369 uml_exitcode = 1; 370 os_dump_core(); 371 return 0; 372 } 373 374 static struct notifier_block panic_exit_notifier = { 375 .notifier_call = panic_exit, 376 .next = NULL, 377 .priority = 0 378 }; 379 380 void __init setup_arch(char **cmdline_p) 381 { 382 atomic_notifier_chain_register(&panic_notifier_list, 383 &panic_exit_notifier); 384 paging_init(); 385 strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); 386 *cmdline_p = command_line; 387 setup_hostinfo(host_info, sizeof host_info); 388 } 389 390 void __init check_bugs(void) 391 { 392 arch_check_bugs(); 393 os_check_bugs(); 394 } 395 396 void apply_alternatives(struct alt_instr *start, struct alt_instr *end) 397 { 398 } 399 400 #ifdef CONFIG_SMP 401 void alternatives_smp_module_add(struct module *mod, char *name, 402 void *locks, void *locks_end, 403 void *text, void *text_end) 404 { 405 } 406 407 void alternatives_smp_module_del(struct module *mod) 408 { 409 } 410 #endif 411