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"
20 #include "linux/utsname.h"
22 #include "asm/pgtable.h"
23 #include "asm/ptrace.h"
26 #include "asm/setup.h"
28 #include "asm/current.h"
29 #include "kern_util.h"
30 #include "as-layout.h"
40 #define DEFAULT_COMMAND_LINE "root=98:0"
42 /* Changed in add_arg and setup_arch, which run before SMP is started */
43 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
45 static void __init add_arg(char *arg)
47 if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
48 printf("add_arg: Too many command line arguments!\n");
51 if(strlen(command_line) > 0)
52 strcat(command_line, " ");
53 strcat(command_line, arg);
57 * These fields are initialized at boot time and not changed.
58 * XXX This structure is used only in the non-SMP case. Maybe this
59 * should be moved to smp.c.
61 struct cpuinfo_um boot_cpu_data = {
63 .ipi_pipe = { -1, -1 }
66 unsigned long thread_saved_pc(struct task_struct *task)
68 /* FIXME: Need to look up userspace_pid by cpu */
69 return os_process_pc(userspace_pid[0]);
72 /* Changed in setup_arch, which is called in early boot */
73 static char host_info[(__NEW_UTS_LEN + 1) * 5];
75 static int show_cpuinfo(struct seq_file *m, void *v)
80 index = (struct cpuinfo_um *) v - cpu_data;
81 if (!cpu_online(index))
85 seq_printf(m, "processor\t: %d\n", index);
86 seq_printf(m, "vendor_id\t: User Mode Linux\n");
87 seq_printf(m, "model name\t: UML\n");
88 seq_printf(m, "mode\t\t: skas\n");
89 seq_printf(m, "host\t\t: %s\n", host_info);
90 seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
91 loops_per_jiffy/(500000/HZ),
92 (loops_per_jiffy/(5000/HZ)) % 100);
97 static void *c_start(struct seq_file *m, loff_t *pos)
99 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
102 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
105 return c_start(m, pos);
108 static void c_stop(struct seq_file *m, void *v)
112 const struct seq_operations cpuinfo_op = {
116 .show = show_cpuinfo,
119 /* Set in linux_main */
120 unsigned long host_task_size;
121 unsigned long task_size;
122 unsigned long uml_physmem;
123 unsigned long uml_reserved; /* Also modified in mem_init */
124 unsigned long start_vm;
125 unsigned long end_vm;
127 /* Set in uml_ncpus_setup */
130 /* Set in early boot */
131 static int have_root __initdata = 0;
133 /* Set in uml_mem_setup and modified in linux_main */
134 long long physmem_size = 32 * 1024 * 1024;
136 static char *usage_string =
137 "User Mode Linux v%s\n"
138 " available at http://user-mode-linux.sourceforge.net/\n\n";
140 static int __init uml_version_setup(char *line, int *add)
142 printf("%s\n", init_utsname()->release);
148 __uml_setup("--version", uml_version_setup,
150 " Prints the version number of the kernel.\n\n"
153 static int __init uml_root_setup(char *line, int *add)
159 __uml_setup("root=", uml_root_setup,
160 "root=<file containing the root fs>\n"
161 " This is actually used by the generic kernel in exactly the same\n"
162 " way as in any other kernel. If you configure a number of block\n"
163 " devices and want to boot off something other than ubd0, you \n"
164 " would use something like:\n"
165 " root=/dev/ubd5\n\n"
168 static int __init no_skas_debug_setup(char *line, int *add)
170 printf("'debug' is not necessary to gdb UML in skas mode - run \n");
171 printf("'gdb linux'");
176 __uml_setup("debug", no_skas_debug_setup,
178 " this flag is not needed to run gdb on UML in skas mode\n\n"
182 static int __init uml_ncpus_setup(char *line, int *add)
184 if (!sscanf(line, "%d", &ncpus)) {
185 printf("Couldn't parse [%s]\n", line);
192 __uml_setup("ncpus=", uml_ncpus_setup,
193 "ncpus=<# of desired CPUs>\n"
194 " This tells an SMP kernel how many virtual processors to start.\n\n"
198 static int __init Usage(char *line, int *add)
202 printf(usage_string, init_utsname()->release);
203 p = &__uml_help_start;
204 while (p < &__uml_help_end) {
212 __uml_setup("--help", Usage,
214 " Prints this message.\n\n"
217 static int __init uml_checksetup(char *line, int *add)
221 p = &__uml_setup_start;
222 while(p < &__uml_setup_end) {
226 if(!strncmp(line, p->str, n)){
227 if (p->setup_func(line + n, add)) return 1;
234 static void __init uml_postsetup(void)
238 p = &__uml_postsetup_start;
239 while(p < &__uml_postsetup_end){
246 /* Set during early boot */
247 unsigned long brk_start;
248 unsigned long end_iomem;
249 EXPORT_SYMBOL(end_iomem);
251 #define MIN_VMALLOC (32 * 1024 * 1024)
253 extern char __binary_start;
255 static unsigned long set_task_sizes_skas(unsigned long *task_size_out)
257 /* Round up to the nearest 4M */
258 unsigned long host_task_size = ROUND_4M((unsigned long)
261 if (!skas_needs_stub)
262 *task_size_out = host_task_size;
263 else *task_size_out = CONFIG_STUB_START & PGDIR_MASK;
265 return host_task_size;
268 int __init linux_main(int argc, char **argv)
270 unsigned long avail, diff;
271 unsigned long virtmem_size, max_physmem;
275 for (i = 1; i < argc; i++){
276 if((i == 1) && (argv[i][0] == ' ')) continue;
278 uml_checksetup(argv[i], &add);
283 add_arg(DEFAULT_COMMAND_LINE);
289 if (proc_mm && ptrace_faultinfo)
294 printf("UML running in %s mode\n", mode);
296 host_task_size = set_task_sizes_skas(&task_size);
299 * Setting up handlers to 'sig_info' struct
301 os_fill_handlinfo(handlinfo_kern);
303 brk_start = (unsigned long) sbrk(0);
305 /* Increase physical memory size for exec-shield users
306 so they actually get what they asked for. This should
307 add zero for non-exec shield users */
309 diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
310 if(diff > 1024 * 1024){
311 printf("Adding %ld bytes to physical memory to account for "
312 "exec-shield gap\n", diff);
313 physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
316 uml_physmem = (unsigned long) &__binary_start & PAGE_MASK;
318 /* Reserve up to 4M after the current brk */
319 uml_reserved = ROUND_4M(brk_start) + (1 << 22);
321 setup_machinename(init_utsname()->machine);
324 iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
325 max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC;
327 /* Zones have to begin on a 1 << MAX_ORDER page boundary,
328 * so this makes sure that's true for highmem
330 max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
331 if(physmem_size + iomem_size > max_physmem){
332 highmem = physmem_size + iomem_size - max_physmem;
333 physmem_size -= highmem;
334 #ifndef CONFIG_HIGHMEM
336 printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
337 "to %Lu bytes\n", physmem_size);
341 high_physmem = uml_physmem + physmem_size;
342 end_iomem = high_physmem + iomem_size;
343 high_memory = (void *) end_iomem;
345 start_vm = VMALLOC_START;
347 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
348 if(init_maps(physmem_size, iomem_size, highmem)){
349 printf("Failed to allocate mem_map for %Lu bytes of physical "
350 "memory and %Lu bytes of highmem\n", physmem_size,
355 virtmem_size = physmem_size;
356 avail = get_kmem_end() - start_vm;
357 if(physmem_size > avail) virtmem_size = avail;
358 end_vm = start_vm + virtmem_size;
360 if(virtmem_size < physmem_size)
361 printf("Kernel virtual memory size shrunk to %lu bytes\n",
366 stack_protections((unsigned long) &init_thread_info);
372 extern int uml_exitcode;
374 static int panic_exit(struct notifier_block *self, unsigned long unused1,
378 show_regs(&(current->thread.regs));
385 static struct notifier_block panic_exit_notifier = {
386 .notifier_call = panic_exit,
391 void __init setup_arch(char **cmdline_p)
393 atomic_notifier_chain_register(&panic_notifier_list,
394 &panic_exit_notifier);
396 strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
397 *cmdline_p = command_line;
398 setup_hostinfo(host_info, sizeof host_info);
401 void __init check_bugs(void)
407 void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
412 void alternatives_smp_module_add(struct module *mod, char *name,
413 void *locks, void *locks_end,
414 void *text, void *text_end)
418 void alternatives_smp_module_del(struct module *mod)