403 строки
8.8 KiB
C
403 строки
8.8 KiB
C
/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/seq_file.h>
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#include <linux/string.h>
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#include <linux/utsname.h>
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#include <asm/pgtable.h>
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#include <asm/processor.h>
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#include <asm/setup.h>
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#include "as-layout.h"
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#include "arch.h"
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#include "init.h"
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#include "kern.h"
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#include "kern_util.h"
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#include "mem_user.h"
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#include "os.h"
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#define DEFAULT_COMMAND_LINE "root=98:0"
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/* Changed in add_arg and setup_arch, which run before SMP is started */
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static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
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static void __init add_arg(char *arg)
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{
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if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
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printf("add_arg: Too many command line arguments!\n");
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exit(1);
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}
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if (strlen(command_line) > 0)
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strcat(command_line, " ");
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strcat(command_line, arg);
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}
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/*
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* These fields are initialized at boot time and not changed.
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* XXX This structure is used only in the non-SMP case. Maybe this
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* should be moved to smp.c.
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*/
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struct cpuinfo_um boot_cpu_data = {
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.loops_per_jiffy = 0,
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.ipi_pipe = { -1, -1 }
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};
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unsigned long thread_saved_pc(struct task_struct *task)
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{
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/* FIXME: Need to look up userspace_pid by cpu */
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return os_process_pc(userspace_pid[0]);
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}
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/* Changed in setup_arch, which is called in early boot */
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static char host_info[(__NEW_UTS_LEN + 1) * 5];
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static int show_cpuinfo(struct seq_file *m, void *v)
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{
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int index = 0;
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#ifdef CONFIG_SMP
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index = (struct cpuinfo_um *) v - cpu_data;
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if (!cpu_online(index))
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return 0;
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#endif
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seq_printf(m, "processor\t: %d\n", index);
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seq_printf(m, "vendor_id\t: User Mode Linux\n");
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seq_printf(m, "model name\t: UML\n");
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seq_printf(m, "mode\t\t: skas\n");
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seq_printf(m, "host\t\t: %s\n", host_info);
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seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
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loops_per_jiffy/(500000/HZ),
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(loops_per_jiffy/(5000/HZ)) % 100);
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return 0;
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}
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static void *c_start(struct seq_file *m, loff_t *pos)
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{
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return *pos < NR_CPUS ? cpu_data + *pos : NULL;
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}
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static void *c_next(struct seq_file *m, void *v, loff_t *pos)
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{
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++*pos;
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return c_start(m, pos);
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}
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static void c_stop(struct seq_file *m, void *v)
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{
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}
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const struct seq_operations cpuinfo_op = {
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.start = c_start,
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.next = c_next,
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.stop = c_stop,
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.show = show_cpuinfo,
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};
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/* Set in linux_main */
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unsigned long uml_physmem;
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unsigned long uml_reserved; /* Also modified in mem_init */
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unsigned long start_vm;
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unsigned long end_vm;
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/* Set in uml_ncpus_setup */
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int ncpus = 1;
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/* Set in early boot */
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static int have_root __initdata = 0;
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/* Set in uml_mem_setup and modified in linux_main */
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long long physmem_size = 32 * 1024 * 1024;
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static const char *usage_string =
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"User Mode Linux v%s\n"
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" available at http://user-mode-linux.sourceforge.net/\n\n";
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static int __init uml_version_setup(char *line, int *add)
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{
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printf("%s\n", init_utsname()->release);
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exit(0);
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return 0;
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}
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__uml_setup("--version", uml_version_setup,
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"--version\n"
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" Prints the version number of the kernel.\n\n"
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);
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static int __init uml_root_setup(char *line, int *add)
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{
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have_root = 1;
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return 0;
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}
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__uml_setup("root=", uml_root_setup,
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"root=<file containing the root fs>\n"
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" This is actually used by the generic kernel in exactly the same\n"
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" way as in any other kernel. If you configure a number of block\n"
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" devices and want to boot off something other than ubd0, you \n"
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" would use something like:\n"
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" root=/dev/ubd5\n\n"
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);
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static int __init no_skas_debug_setup(char *line, int *add)
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{
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printf("'debug' is not necessary to gdb UML in skas mode - run \n");
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printf("'gdb linux'\n");
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return 0;
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}
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__uml_setup("debug", no_skas_debug_setup,
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"debug\n"
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" this flag is not needed to run gdb on UML in skas mode\n\n"
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);
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#ifdef CONFIG_SMP
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static int __init uml_ncpus_setup(char *line, int *add)
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{
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if (!sscanf(line, "%d", &ncpus)) {
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printf("Couldn't parse [%s]\n", line);
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return -1;
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}
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return 0;
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}
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__uml_setup("ncpus=", uml_ncpus_setup,
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"ncpus=<# of desired CPUs>\n"
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" This tells an SMP kernel how many virtual processors to start.\n\n"
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);
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#endif
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static int __init Usage(char *line, int *add)
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{
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const char **p;
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printf(usage_string, init_utsname()->release);
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p = &__uml_help_start;
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while (p < &__uml_help_end) {
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printf("%s", *p);
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p++;
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}
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exit(0);
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return 0;
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}
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__uml_setup("--help", Usage,
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"--help\n"
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" Prints this message.\n\n"
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);
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static void __init uml_checksetup(char *line, int *add)
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{
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struct uml_param *p;
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p = &__uml_setup_start;
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while (p < &__uml_setup_end) {
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size_t n;
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n = strlen(p->str);
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if (!strncmp(line, p->str, n) && p->setup_func(line + n, add))
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return;
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p++;
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}
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}
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static void __init uml_postsetup(void)
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{
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initcall_t *p;
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p = &__uml_postsetup_start;
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while (p < &__uml_postsetup_end) {
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(*p)();
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p++;
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}
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return;
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}
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static int panic_exit(struct notifier_block *self, unsigned long unused1,
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void *unused2)
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{
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bust_spinlocks(1);
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show_regs(&(current->thread.regs));
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bust_spinlocks(0);
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uml_exitcode = 1;
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os_dump_core();
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return 0;
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}
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static struct notifier_block panic_exit_notifier = {
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.notifier_call = panic_exit,
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.next = NULL,
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.priority = 0
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};
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/* Set during early boot */
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unsigned long task_size;
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EXPORT_SYMBOL(task_size);
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unsigned long host_task_size;
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unsigned long brk_start;
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unsigned long end_iomem;
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EXPORT_SYMBOL(end_iomem);
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#define MIN_VMALLOC (32 * 1024 * 1024)
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extern char __binary_start;
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int __init linux_main(int argc, char **argv)
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{
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unsigned long avail, diff;
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unsigned long virtmem_size, max_physmem;
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unsigned long stack;
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unsigned int i;
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int add;
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char * mode;
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for (i = 1; i < argc; i++) {
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if ((i == 1) && (argv[i][0] == ' '))
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continue;
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add = 1;
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uml_checksetup(argv[i], &add);
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if (add)
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add_arg(argv[i]);
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}
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if (have_root == 0)
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add_arg(DEFAULT_COMMAND_LINE);
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host_task_size = os_get_top_address();
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/*
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* TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps
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* out
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*/
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task_size = host_task_size & PGDIR_MASK;
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/* OS sanity checks that need to happen before the kernel runs */
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os_early_checks();
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can_do_skas();
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if (proc_mm && ptrace_faultinfo)
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mode = "SKAS3";
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else
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mode = "SKAS0";
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printf("UML running in %s mode\n", mode);
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brk_start = (unsigned long) sbrk(0);
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/*
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* Increase physical memory size for exec-shield users
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* so they actually get what they asked for. This should
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* add zero for non-exec shield users
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*/
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diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
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if (diff > 1024 * 1024) {
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printf("Adding %ld bytes to physical memory to account for "
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"exec-shield gap\n", diff);
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physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
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}
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uml_physmem = (unsigned long) &__binary_start & PAGE_MASK;
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/* Reserve up to 4M after the current brk */
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uml_reserved = ROUND_4M(brk_start) + (1 << 22);
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setup_machinename(init_utsname()->machine);
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highmem = 0;
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iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
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max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
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/*
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* Zones have to begin on a 1 << MAX_ORDER page boundary,
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* so this makes sure that's true for highmem
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*/
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max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
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if (physmem_size + iomem_size > max_physmem) {
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highmem = physmem_size + iomem_size - max_physmem;
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physmem_size -= highmem;
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#ifndef CONFIG_HIGHMEM
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highmem = 0;
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printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
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"to %Lu bytes\n", physmem_size);
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#endif
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}
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high_physmem = uml_physmem + physmem_size;
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end_iomem = high_physmem + iomem_size;
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high_memory = (void *) end_iomem;
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start_vm = VMALLOC_START;
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setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
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if (init_maps(physmem_size, iomem_size, highmem)) {
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printf("Failed to allocate mem_map for %Lu bytes of physical "
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"memory and %Lu bytes of highmem\n", physmem_size,
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highmem);
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exit(1);
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}
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virtmem_size = physmem_size;
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stack = (unsigned long) argv;
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stack &= ~(1024 * 1024 - 1);
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avail = stack - start_vm;
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if (physmem_size > avail)
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virtmem_size = avail;
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end_vm = start_vm + virtmem_size;
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if (virtmem_size < physmem_size)
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printf("Kernel virtual memory size shrunk to %lu bytes\n",
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virtmem_size);
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atomic_notifier_chain_register(&panic_notifier_list,
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&panic_exit_notifier);
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uml_postsetup();
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stack_protections((unsigned long) &init_thread_info);
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os_flush_stdout();
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return start_uml();
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}
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void __init setup_arch(char **cmdline_p)
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{
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paging_init();
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strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
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*cmdline_p = command_line;
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setup_hostinfo(host_info, sizeof host_info);
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}
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void __init check_bugs(void)
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{
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arch_check_bugs();
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os_check_bugs();
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}
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void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
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{
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}
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#ifdef CONFIG_SMP
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void alternatives_smp_module_add(struct module *mod, char *name,
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void *locks, void *locks_end,
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void *text, void *text_end)
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{
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}
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void alternatives_smp_module_del(struct module *mod)
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{
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}
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#endif
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