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/init.h> 8 #include <linux/mm.h> 9 #include <linux/module.h> 10 #include <linux/seq_file.h> 11 #include <linux/string.h> 12 #include <linux/utsname.h> 13 #include <linux/sched.h> 14 #include <linux/kmsg_dump.h> 15 #include <asm/pgtable.h> 16 #include <asm/processor.h> 17 #include <asm/sections.h> 18 #include <asm/setup.h> 19 #include <as-layout.h> 20 #include <arch.h> 21 #include <init.h> 22 #include <kern.h> 23 #include <kern_util.h> 24 #include <mem_user.h> 25 #include <os.h> 26 27 #define DEFAULT_COMMAND_LINE "root=98:0" 28 29 /* Changed in add_arg and setup_arch, which run before SMP is started */ 30 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 }; 31 32 static void __init add_arg(char *arg) 33 { 34 if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) { 35 printf("add_arg: Too many command line arguments!\n"); 36 exit(1); 37 } 38 if (strlen(command_line) > 0) 39 strcat(command_line, " "); 40 strcat(command_line, arg); 41 } 42 43 /* 44 * These fields are initialized at boot time and not changed. 45 * XXX This structure is used only in the non-SMP case. Maybe this 46 * should be moved to smp.c. 47 */ 48 struct cpuinfo_um boot_cpu_data = { 49 .loops_per_jiffy = 0, 50 .ipi_pipe = { -1, -1 } 51 }; 52 53 union thread_union cpu0_irqstack 54 __attribute__((__section__(".data..init_irqstack"))) = 55 { INIT_THREAD_INFO(init_task) }; 56 57 unsigned long thread_saved_pc(struct task_struct *task) 58 { 59 /* FIXME: Need to look up userspace_pid by cpu */ 60 return os_process_pc(userspace_pid[0]); 61 } 62 63 /* Changed in setup_arch, which is called in early boot */ 64 static char host_info[(__NEW_UTS_LEN + 1) * 5]; 65 66 static int show_cpuinfo(struct seq_file *m, void *v) 67 { 68 int index = 0; 69 70 seq_printf(m, "processor\t: %d\n", index); 71 seq_printf(m, "vendor_id\t: User Mode Linux\n"); 72 seq_printf(m, "model name\t: UML\n"); 73 seq_printf(m, "mode\t\t: skas\n"); 74 seq_printf(m, "host\t\t: %s\n", host_info); 75 seq_printf(m, "bogomips\t: %lu.%02lu\n\n", 76 loops_per_jiffy/(500000/HZ), 77 (loops_per_jiffy/(5000/HZ)) % 100); 78 79 return 0; 80 } 81 82 static void *c_start(struct seq_file *m, loff_t *pos) 83 { 84 return *pos < NR_CPUS ? cpu_data + *pos : NULL; 85 } 86 87 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 88 { 89 ++*pos; 90 return c_start(m, pos); 91 } 92 93 static void c_stop(struct seq_file *m, void *v) 94 { 95 } 96 97 const struct seq_operations cpuinfo_op = { 98 .start = c_start, 99 .next = c_next, 100 .stop = c_stop, 101 .show = show_cpuinfo, 102 }; 103 104 /* Set in linux_main */ 105 unsigned long uml_physmem; 106 EXPORT_SYMBOL(uml_physmem); 107 108 unsigned long uml_reserved; /* Also modified in mem_init */ 109 unsigned long start_vm; 110 unsigned long end_vm; 111 112 /* Set in uml_ncpus_setup */ 113 int ncpus = 1; 114 115 /* Set in early boot */ 116 static int have_root __initdata = 0; 117 118 /* Set in uml_mem_setup and modified in linux_main */ 119 long long physmem_size = 32 * 1024 * 1024; 120 121 static const char *usage_string = 122 "User Mode Linux v%s\n" 123 " available at http://user-mode-linux.sourceforge.net/\n\n"; 124 125 static int __init uml_version_setup(char *line, int *add) 126 { 127 printf("%s\n", init_utsname()->release); 128 exit(0); 129 130 return 0; 131 } 132 133 __uml_setup("--version", uml_version_setup, 134 "--version\n" 135 " Prints the version number of the kernel.\n\n" 136 ); 137 138 static int __init uml_root_setup(char *line, int *add) 139 { 140 have_root = 1; 141 return 0; 142 } 143 144 __uml_setup("root=", uml_root_setup, 145 "root=<file containing the root fs>\n" 146 " This is actually used by the generic kernel in exactly the same\n" 147 " way as in any other kernel. If you configure a number of block\n" 148 " devices and want to boot off something other than ubd0, you \n" 149 " would use something like:\n" 150 " root=/dev/ubd5\n\n" 151 ); 152 153 static int __init no_skas_debug_setup(char *line, int *add) 154 { 155 printf("'debug' is not necessary to gdb UML in skas mode - run \n"); 156 printf("'gdb linux'\n"); 157 158 return 0; 159 } 160 161 __uml_setup("debug", no_skas_debug_setup, 162 "debug\n" 163 " this flag is not needed to run gdb on UML in skas mode\n\n" 164 ); 165 166 static int __init Usage(char *line, int *add) 167 { 168 const char **p; 169 170 printf(usage_string, init_utsname()->release); 171 p = &__uml_help_start; 172 while (p < &__uml_help_end) { 173 printf("%s", *p); 174 p++; 175 } 176 exit(0); 177 return 0; 178 } 179 180 __uml_setup("--help", Usage, 181 "--help\n" 182 " Prints this message.\n\n" 183 ); 184 185 static void __init uml_checksetup(char *line, int *add) 186 { 187 struct uml_param *p; 188 189 p = &__uml_setup_start; 190 while (p < &__uml_setup_end) { 191 size_t n; 192 193 n = strlen(p->str); 194 if (!strncmp(line, p->str, n) && p->setup_func(line + n, add)) 195 return; 196 p++; 197 } 198 } 199 200 static void __init uml_postsetup(void) 201 { 202 initcall_t *p; 203 204 p = &__uml_postsetup_start; 205 while (p < &__uml_postsetup_end) { 206 (*p)(); 207 p++; 208 } 209 return; 210 } 211 212 static int panic_exit(struct notifier_block *self, unsigned long unused1, 213 void *unused2) 214 { 215 kmsg_dump(KMSG_DUMP_PANIC); 216 bust_spinlocks(1); 217 bust_spinlocks(0); 218 uml_exitcode = 1; 219 os_dump_core(); 220 return 0; 221 } 222 223 static struct notifier_block panic_exit_notifier = { 224 .notifier_call = panic_exit, 225 .next = NULL, 226 .priority = 0 227 }; 228 229 void uml_finishsetup(void) 230 { 231 atomic_notifier_chain_register(&panic_notifier_list, 232 &panic_exit_notifier); 233 234 uml_postsetup(); 235 236 new_thread_handler(); 237 } 238 239 /* Set during early boot */ 240 unsigned long task_size; 241 EXPORT_SYMBOL(task_size); 242 243 unsigned long host_task_size; 244 245 unsigned long brk_start; 246 unsigned long end_iomem; 247 EXPORT_SYMBOL(end_iomem); 248 249 #define MIN_VMALLOC (32 * 1024 * 1024) 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 long stack; 256 unsigned int i; 257 int add; 258 259 for (i = 1; i < argc; i++) { 260 if ((i == 1) && (argv[i][0] == ' ')) 261 continue; 262 add = 1; 263 uml_checksetup(argv[i], &add); 264 if (add) 265 add_arg(argv[i]); 266 } 267 if (have_root == 0) 268 add_arg(DEFAULT_COMMAND_LINE); 269 270 host_task_size = os_get_top_address(); 271 /* 272 * TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps 273 * out 274 */ 275 task_size = host_task_size & PGDIR_MASK; 276 277 /* OS sanity checks that need to happen before the kernel runs */ 278 os_early_checks(); 279 280 brk_start = (unsigned long) sbrk(0); 281 282 /* 283 * Increase physical memory size for exec-shield users 284 * so they actually get what they asked for. This should 285 * add zero for non-exec shield users 286 */ 287 288 diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); 289 if (diff > 1024 * 1024) { 290 printf("Adding %ld bytes to physical memory to account for " 291 "exec-shield gap\n", diff); 292 physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); 293 } 294 295 uml_physmem = (unsigned long) __binary_start & PAGE_MASK; 296 297 /* Reserve up to 4M after the current brk */ 298 uml_reserved = ROUND_4M(brk_start) + (1 << 22); 299 300 setup_machinename(init_utsname()->machine); 301 302 highmem = 0; 303 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK; 304 max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC; 305 306 /* 307 * Zones have to begin on a 1 << MAX_ORDER page boundary, 308 * so this makes sure that's true for highmem 309 */ 310 max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1); 311 if (physmem_size + iomem_size > max_physmem) { 312 highmem = physmem_size + iomem_size - max_physmem; 313 physmem_size -= highmem; 314 } 315 316 high_physmem = uml_physmem + physmem_size; 317 end_iomem = high_physmem + iomem_size; 318 high_memory = (void *) end_iomem; 319 320 start_vm = VMALLOC_START; 321 322 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem); 323 mem_total_pages(physmem_size, iomem_size, highmem); 324 325 virtmem_size = physmem_size; 326 stack = (unsigned long) argv; 327 stack &= ~(1024 * 1024 - 1); 328 avail = stack - start_vm; 329 if (physmem_size > avail) 330 virtmem_size = avail; 331 end_vm = start_vm + virtmem_size; 332 333 if (virtmem_size < physmem_size) 334 printf("Kernel virtual memory size shrunk to %lu bytes\n", 335 virtmem_size); 336 337 stack_protections((unsigned long) &init_thread_info); 338 os_flush_stdout(); 339 340 return start_uml(); 341 } 342 343 void __init setup_arch(char **cmdline_p) 344 { 345 paging_init(); 346 strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); 347 *cmdline_p = command_line; 348 setup_hostinfo(host_info, sizeof host_info); 349 } 350 351 void __init check_bugs(void) 352 { 353 arch_check_bugs(); 354 os_check_bugs(); 355 } 356 357 void apply_alternatives(struct alt_instr *start, struct alt_instr *end) 358 { 359 } 360