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461 lines
10 KiB
461 lines
10 KiB
/*
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* Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include "linux/config.h"
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#include "linux/kernel.h"
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#include "linux/sched.h"
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#include "linux/notifier.h"
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#include "linux/mm.h"
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#include "linux/types.h"
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#include "linux/tty.h"
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#include "linux/init.h"
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#include "linux/bootmem.h"
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#include "linux/spinlock.h"
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#include "linux/utsname.h"
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#include "linux/sysrq.h"
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#include "linux/seq_file.h"
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#include "linux/delay.h"
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#include "linux/module.h"
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#include "asm/page.h"
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#include "asm/pgtable.h"
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#include "asm/ptrace.h"
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#include "asm/elf.h"
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#include "asm/user.h"
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#include "asm/setup.h"
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#include "ubd_user.h"
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#include "asm/current.h"
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#include "user_util.h"
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#include "kern_util.h"
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#include "kern.h"
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#include "mem_user.h"
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#include "mem.h"
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#include "umid.h"
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#include "initrd.h"
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#include "init.h"
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#include "os.h"
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#include "choose-mode.h"
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#include "mode_kern.h"
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#include "mode.h"
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#define DEFAULT_COMMAND_LINE "root=98:0"
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/* Changed in linux_main and setup_arch, which run before SMP is started */
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static char command_line[COMMAND_LINE_SIZE] = { 0 };
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static void 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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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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return(os_process_pc(CHOOSE_MODE_PROC(thread_pid_tt, thread_pid_skas,
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task)));
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}
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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: %s\n", CHOOSE_MODE("tt", "skas"));
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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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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 host_task_size;
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unsigned long task_size;
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unsigned long uml_start;
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/* Set in early boot */
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unsigned long uml_physmem;
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unsigned long uml_reserved;
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unsigned long start_vm;
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unsigned long end_vm;
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int ncpus = 1;
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#ifdef CONFIG_MODE_TT
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/* Pointer set in linux_main, the array itself is private to each thread,
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* and changed at address space creation time so this poses no concurrency
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* problems.
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*/
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static char *argv1_begin = NULL;
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static char *argv1_end = NULL;
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#endif
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/* Set in early boot */
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static int have_root __initdata = 0;
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long physmem_size = 32 * 1024 * 1024;
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void set_cmdline(char *cmd)
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{
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#ifdef CONFIG_MODE_TT
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char *umid, *ptr;
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if(CHOOSE_MODE(honeypot, 0)) return;
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umid = get_umid(1);
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if(umid != NULL){
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snprintf(argv1_begin,
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(argv1_end - argv1_begin) * sizeof(*ptr),
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"(%s) ", umid);
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ptr = &argv1_begin[strlen(argv1_begin)];
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}
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else ptr = argv1_begin;
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snprintf(ptr, (argv1_end - ptr) * sizeof(*ptr), "[%s]", cmd);
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memset(argv1_begin + strlen(argv1_begin), '\0',
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argv1_end - argv1_begin - strlen(argv1_begin));
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#endif
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}
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static 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", system_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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#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 force_tt = 0;
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#if defined(CONFIG_MODE_TT) && defined(CONFIG_MODE_SKAS)
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#define DEFAULT_TT 0
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static int __init mode_tt_setup(char *line, int *add)
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{
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force_tt = 1;
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return(0);
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}
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#else
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#ifdef CONFIG_MODE_SKAS
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#define DEFAULT_TT 0
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static int __init mode_tt_setup(char *line, int *add)
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{
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printf("CONFIG_MODE_TT disabled - 'mode=tt' ignored\n");
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return(0);
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}
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#else
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#ifdef CONFIG_MODE_TT
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#define DEFAULT_TT 1
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static int __init mode_tt_setup(char *line, int *add)
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{
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printf("CONFIG_MODE_SKAS disabled - 'mode=tt' redundant\n");
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return(0);
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}
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#else
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#error Either CONFIG_MODE_TT or CONFIG_MODE_SKAS must be enabled
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#endif
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#endif
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#endif
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__uml_setup("mode=tt", mode_tt_setup,
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"mode=tt\n"
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" When both CONFIG_MODE_TT and CONFIG_MODE_SKAS are enabled, this option\n"
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" forces UML to run in tt (tracing thread) mode. It is not the default\n"
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" because it's slower and less secure than skas mode.\n\n"
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);
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int mode_tt = DEFAULT_TT;
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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, system_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 int __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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int n;
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n = strlen(p->str);
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if(!strncmp(line, p->str, n)){
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if (p->setup_func(line + n, add)) return 1;
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}
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p++;
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}
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return 0;
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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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/* Set during early boot */
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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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int 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 int i, add;
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for (i = 1; i < argc; i++){
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if((i == 1) && (argv[i][0] == ' ')) 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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mode_tt = force_tt ? 1 : !can_do_skas();
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#ifndef CONFIG_MODE_TT
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if (mode_tt) {
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/*Since CONFIG_MODE_TT is #undef'ed, force_tt cannot be 1. So,
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* can_do_skas() returned 0, and the message is correct. */
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printf("Support for TT mode is disabled, and no SKAS support is present on the host.\n");
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exit(1);
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}
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#endif
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uml_start = CHOOSE_MODE_PROC(set_task_sizes_tt, set_task_sizes_skas, 0,
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&host_task_size, &task_size);
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/* Need to check this early because mmapping happens before the
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* kernel is running.
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*/
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check_tmpexec();
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brk_start = (unsigned long) sbrk(0);
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CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start);
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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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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 = uml_start;
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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(system_utsname.machine);
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#ifdef CONFIG_MODE_TT
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argv1_begin = argv[1];
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argv1_end = &argv[1][strlen(argv[1])];
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#endif
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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 = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC;
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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 %ld 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 %ld bytes of physical "
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"memory and %ld 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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avail = get_kmem_end() - start_vm;
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if(physmem_size > avail) 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 %ld bytes\n",
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virtmem_size);
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uml_postsetup();
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task_protections((unsigned long) &init_thread_info);
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os_flush_stdout();
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return(CHOOSE_MODE(start_uml_tt(), start_uml_skas()));
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}
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extern int uml_exitcode;
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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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machine_halt();
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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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void __init setup_arch(char **cmdline_p)
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{
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notifier_chain_register(&panic_notifier_list, &panic_exit_notifier);
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paging_init();
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strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
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*cmdline_p = command_line;
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setup_hostinfo();
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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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check_ptrace();
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check_sigio();
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check_devanon();
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}
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void apply_alternatives(void *start, void *end)
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{
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}
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