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 <asm/pgtable.h> 14#include <asm/processor.h> 15#include <asm/setup.h> 16#include "as-layout.h" 17#include "arch.h" 18#include "init.h" 19#include "kern.h" 20#include "kern_util.h" 21#include "mem_user.h" 22#include "os.h" 23 24#define DEFAULT_COMMAND_LINE "root=98:0" 25 26/* Changed in add_arg and setup_arch, which run before SMP is started */ 27static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 }; 28 29static void __init add_arg(char *arg) 30{ 31 if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) { 32 printf("add_arg: Too many command line arguments!\n"); 33 exit(1); 34 } 35 if (strlen(command_line) > 0) 36 strcat(command_line, " "); 37 strcat(command_line, arg); 38} 39 40struct cpuinfo_um boot_cpu_data = { 41 .loops_per_jiffy = 0, 42 .ipi_pipe = { -1, -1 } 43}; 44 45unsigned long thread_saved_pc(struct task_struct *task) 46{ 47 return os_process_pc(userspace_pid[0]); 48} 49 50/* Changed in setup_arch, which is called in early boot */ 51static char host_info[(__NEW_UTS_LEN + 1) * 5]; 52 53static int show_cpuinfo(struct seq_file *m, void *v) 54{ 55 int index = 0; 56 57#ifdef CONFIG_SMP 58 index = (struct cpuinfo_um *) v - cpu_data; 59 if (!cpu_online(index)) 60 return 0; 61#endif 62 63 seq_printf(m, "processor\t: %d\n", index); 64 seq_printf(m, "vendor_id\t: User Mode Linux\n"); 65 seq_printf(m, "model name\t: UML\n"); 66 seq_printf(m, "mode\t\t: skas\n"); 67 seq_printf(m, "host\t\t: %s\n", host_info); 68 seq_printf(m, "bogomips\t: %lu.%02lu\n\n", 69 loops_per_jiffy/(500000/HZ), 70 (loops_per_jiffy/(5000/HZ)) % 100); 71 72 return 0; 73} 74 75static void *c_start(struct seq_file *m, loff_t *pos) 76{ 77 return *pos < NR_CPUS ? cpu_data + *pos : NULL; 78} 79 80static void *c_next(struct seq_file *m, void *v, loff_t *pos) 81{ 82 ++*pos; 83 return c_start(m, pos); 84} 85 86static void c_stop(struct seq_file *m, void *v) 87{ 88} 89 90const struct seq_operations cpuinfo_op = { 91 .start = c_start, 92 .next = c_next, 93 .stop = c_stop, 94 .show = show_cpuinfo, 95}; 96 97/* Set in linux_main */ 98unsigned long uml_physmem; 99unsigned long uml_reserved; /* Also modified in mem_init */ 100unsigned long start_vm; 101unsigned long end_vm; 102 103/* Set in uml_ncpus_setup */ 104int ncpus = 1; 105 106/* Set in early boot */ 107static int have_root __initdata = 0; 108 109/* Set in uml_mem_setup and modified in linux_main */ 110long long physmem_size = 32 * 1024 * 1024; 111 112static const char *usage_string = 113"User Mode Linux v%s\n" 114" available at http://user-mode-linux.sourceforge.net/\n\n"; 115 116static int __init uml_version_setup(char *line, int *add) 117{ 118 printf("%s\n", init_utsname()->release); 119 exit(0); 120 121 return 0; 122} 123 124__uml_setup("--version", uml_version_setup, 125"--version\n" 126" Prints the version number of the kernel.\n\n" 127); 128 129static int __init uml_root_setup(char *line, int *add) 130{ 131 have_root = 1; 132 return 0; 133} 134 135__uml_setup("root=", uml_root_setup, 136"root=<file containing the root fs>\n" 137" This is actually used by the generic kernel in exactly the same\n" 138" way as in any other kernel. If you configure a number of block\n" 139" devices and want to boot off something other than ubd0, you \n" 140" would use something like:\n" 141" root=/dev/ubd5\n\n" 142); 143 144static int __init no_skas_debug_setup(char *line, int *add) 145{ 146 printf("'debug' is not necessary to gdb UML in skas mode - run \n"); 147 printf("'gdb linux'\n"); 148 149 return 0; 150} 151 152__uml_setup("debug", no_skas_debug_setup, 153"debug\n" 154" this flag is not needed to run gdb on UML in skas mode\n\n" 155); 156 157#ifdef CONFIG_SMP 158static int __init uml_ncpus_setup(char *line, int *add) 159{ 160 if (!sscanf(line, "%d", &ncpus)) { 161 printf("Couldn't parse [%s]\n", line); 162 return -1; 163 } 164 165 return 0; 166} 167 168__uml_setup("ncpus=", uml_ncpus_setup, 169"ncpus=<# of desired CPUs>\n" 170" This tells an SMP kernel how many virtual processors to start.\n\n" 171); 172#endif 173 174static int __init Usage(char *line, int *add) 175{ 176 const char **p; 177 178 printf(usage_string, init_utsname()->release); 179 p = &__uml_help_start; 180 while (p < &__uml_help_end) { 181 printf("%s", *p); 182 p++; 183 } 184 exit(0); 185 return 0; 186} 187 188__uml_setup("--help", Usage, 189"--help\n" 190" Prints this message.\n\n" 191); 192 193static void __init uml_checksetup(char *line, int *add) 194{ 195 struct uml_param *p; 196 197 p = &__uml_setup_start; 198 while (p < &__uml_setup_end) { 199 size_t n; 200 201 n = strlen(p->str); 202 if (!strncmp(line, p->str, n) && p->setup_func(line + n, add)) 203 return; 204 p++; 205 } 206} 207 208static void __init uml_postsetup(void) 209{ 210 initcall_t *p; 211 212 p = &__uml_postsetup_start; 213 while (p < &__uml_postsetup_end) { 214 (*p)(); 215 p++; 216 } 217 return; 218} 219 220static int panic_exit(struct notifier_block *self, unsigned long unused1, 221 void *unused2) 222{ 223 bust_spinlocks(1); 224 show_regs(&(current->thread.regs)); 225 bust_spinlocks(0); 226 uml_exitcode = 1; 227 os_dump_core(); 228 return 0; 229} 230 231static struct notifier_block panic_exit_notifier = { 232 .notifier_call = panic_exit, 233 .next = NULL, 234 .priority = 0 235}; 236 237/* Set during early boot */ 238unsigned long task_size; 239EXPORT_SYMBOL(task_size); 240 241unsigned long host_task_size; 242 243unsigned long brk_start; 244unsigned long end_iomem; 245EXPORT_SYMBOL(end_iomem); 246 247#define MIN_VMALLOC (32 * 1024 * 1024) 248 249extern char __binary_start; 250 251int __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 char * mode; 259 260 for (i = 1; i < argc; i++) { 261 if ((i == 1) && (argv[i][0] == ' ')) 262 continue; 263 add = 1; 264 uml_checksetup(argv[i], &add); 265 if (add) 266 add_arg(argv[i]); 267 } 268 if (have_root == 0) 269 add_arg(DEFAULT_COMMAND_LINE); 270 271 host_task_size = os_get_top_address(); 272 /* 273 * TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps 274 * out 275 */ 276 task_size = host_task_size & PGDIR_MASK; 277 278 /* OS sanity checks that need to happen before the kernel runs */ 279 os_early_checks(); 280 281 can_do_skas(); 282 283 if (proc_mm && ptrace_faultinfo) 284 mode = "SKAS3"; 285 else 286 mode = "SKAS0"; 287 288 printf("UML running in %s mode\n", mode); 289 290 brk_start = (unsigned long) sbrk(0); 291 292 /* 293 * Increase physical memory size for exec-shield users 294 * so they actually get what they asked for. This should 295 * add zero for non-exec shield users 296 */ 297 298 diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); 299 if (diff > 1024 * 1024) { 300 printf("Adding %ld bytes to physical memory to account for " 301 "exec-shield gap\n", diff); 302 physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); 303 } 304 305 uml_physmem = (unsigned long) &__binary_start & PAGE_MASK; 306 307 /* Reserve up to 4M after the current brk */ 308 uml_reserved = ROUND_4M(brk_start) + (1 << 22); 309 310 setup_machinename(init_utsname()->machine); 311 312 highmem = 0; 313 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK; 314 max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC; 315 316 /* 317 * Zones have to begin on a 1 << MAX_ORDER page boundary, 318 * so this makes sure that's true for highmem 319 */ 320 max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1); 321 if (physmem_size + iomem_size > max_physmem) { 322 highmem = physmem_size + iomem_size - max_physmem; 323 physmem_size -= highmem; 324#ifndef CONFIG_HIGHMEM 325 highmem = 0; 326 printf("CONFIG_HIGHMEM not enabled - physical memory shrunk " 327 "to %Lu bytes\n", physmem_size); 328#endif 329 } 330 331 high_physmem = uml_physmem + physmem_size; 332 end_iomem = high_physmem + iomem_size; 333 high_memory = (void *) end_iomem; 334 335 start_vm = VMALLOC_START; 336 337 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem); 338 if (init_maps(physmem_size, iomem_size, highmem)) { 339 printf("Failed to allocate mem_map for %Lu bytes of physical " 340 "memory and %Lu bytes of highmem\n", physmem_size, 341 highmem); 342 exit(1); 343 } 344 345 virtmem_size = physmem_size; 346 stack = (unsigned long) argv; 347 stack &= ~(1024 * 1024 - 1); 348 avail = stack - start_vm; 349 if (physmem_size > avail) 350 virtmem_size = avail; 351 end_vm = start_vm + virtmem_size; 352 353 if (virtmem_size < physmem_size) 354 printf("Kernel virtual memory size shrunk to %lu bytes\n", 355 virtmem_size); 356 357 atomic_notifier_chain_register(&panic_notifier_list, 358 &panic_exit_notifier); 359 360 uml_postsetup(); 361 362 stack_protections((unsigned long) &init_thread_info); 363 os_flush_stdout(); 364 365 return start_uml(); 366} 367 368void __init setup_arch(char **cmdline_p) 369{ 370 paging_init(); 371 strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); 372 *cmdline_p = command_line; 373 setup_hostinfo(host_info, sizeof host_info); 374} 375 376void __init check_bugs(void) 377{ 378 arch_check_bugs(); 379 os_check_bugs(); 380} 381 382void apply_alternatives(struct alt_instr *start, struct alt_instr *end) 383{ 384} 385 386#ifdef CONFIG_SMP 387void alternatives_smp_module_add(struct module *mod, char *name, 388 void *locks, void *locks_end, 389 void *text, void *text_end) 390{ 391} 392 393void alternatives_smp_module_del(struct module *mod) 394{ 395} 396#endif 397