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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/um/kernel/um_arch.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/um/kernel/um_arch.c')
-rw-r--r-- | arch/um/kernel/um_arch.c | 467 |
1 files changed, 467 insertions, 0 deletions
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c new file mode 100644 index 000000000000..5c49d88eed3d --- /dev/null +++ b/arch/um/kernel/um_arch.c @@ -0,0 +1,467 @@ +/* + * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com) + * Licensed under the GPL + */ + +#include "linux/config.h" +#include "linux/kernel.h" +#include "linux/sched.h" +#include "linux/notifier.h" +#include "linux/mm.h" +#include "linux/types.h" +#include "linux/tty.h" +#include "linux/init.h" +#include "linux/bootmem.h" +#include "linux/spinlock.h" +#include "linux/utsname.h" +#include "linux/sysrq.h" +#include "linux/seq_file.h" +#include "linux/delay.h" +#include "linux/module.h" +#include "asm/page.h" +#include "asm/pgtable.h" +#include "asm/ptrace.h" +#include "asm/elf.h" +#include "asm/user.h" +#include "ubd_user.h" +#include "asm/current.h" +#include "asm/setup.h" +#include "user_util.h" +#include "kern_util.h" +#include "kern.h" +#include "mem_user.h" +#include "mem.h" +#include "umid.h" +#include "initrd.h" +#include "init.h" +#include "os.h" +#include "choose-mode.h" +#include "mode_kern.h" +#include "mode.h" + +#define DEFAULT_COMMAND_LINE "root=98:0" + +/* Changed in linux_main and setup_arch, which run before SMP is started */ +char command_line[COMMAND_LINE_SIZE] = { 0 }; + +void add_arg(char *arg) +{ + if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) { + printf("add_arg: Too many command line arguments!\n"); + exit(1); + } + if(strlen(command_line) > 0) + strcat(command_line, " "); + strcat(command_line, arg); +} + +struct cpuinfo_um boot_cpu_data = { + .loops_per_jiffy = 0, + .ipi_pipe = { -1, -1 } +}; + +unsigned long thread_saved_pc(struct task_struct *task) +{ + return(os_process_pc(CHOOSE_MODE_PROC(thread_pid_tt, thread_pid_skas, + task))); +} + +static int show_cpuinfo(struct seq_file *m, void *v) +{ + int index = 0; + +#ifdef CONFIG_SMP + index = (struct cpuinfo_um *) v - cpu_data; + if (!cpu_online(index)) + return 0; +#endif + + seq_printf(m, "processor\t: %d\n", index); + seq_printf(m, "vendor_id\t: User Mode Linux\n"); + seq_printf(m, "model name\t: UML\n"); + seq_printf(m, "mode\t\t: %s\n", CHOOSE_MODE("tt", "skas")); + seq_printf(m, "host\t\t: %s\n", host_info); + seq_printf(m, "bogomips\t: %lu.%02lu\n\n", + loops_per_jiffy/(500000/HZ), + (loops_per_jiffy/(5000/HZ)) % 100); + + return(0); +} + +static void *c_start(struct seq_file *m, loff_t *pos) +{ + return *pos < NR_CPUS ? cpu_data + *pos : NULL; +} + +static void *c_next(struct seq_file *m, void *v, loff_t *pos) +{ + ++*pos; + return c_start(m, pos); +} + +static void c_stop(struct seq_file *m, void *v) +{ +} + +struct seq_operations cpuinfo_op = { + .start = c_start, + .next = c_next, + .stop = c_stop, + .show = show_cpuinfo, +}; + +pte_t * __bad_pagetable(void) +{ + panic("Someone should implement __bad_pagetable"); + return(NULL); +} + +/* Set in linux_main */ +unsigned long host_task_size; +unsigned long task_size; + +unsigned long uml_start; + +/* Set in early boot */ +unsigned long uml_physmem; +unsigned long uml_reserved; +unsigned long start_vm; +unsigned long end_vm; +int ncpus = 1; + +#ifdef CONFIG_MODE_TT +/* Pointer set in linux_main, the array itself is private to each thread, + * and changed at address space creation time so this poses no concurrency + * problems. + */ +static char *argv1_begin = NULL; +static char *argv1_end = NULL; +#endif + +/* Set in early boot */ +static int have_root __initdata = 0; +long physmem_size = 32 * 1024 * 1024; + +void set_cmdline(char *cmd) +{ +#ifdef CONFIG_MODE_TT + char *umid, *ptr; + + if(CHOOSE_MODE(honeypot, 0)) return; + + umid = get_umid(1); + if(umid != NULL){ + snprintf(argv1_begin, + (argv1_end - argv1_begin) * sizeof(*ptr), + "(%s) ", umid); + ptr = &argv1_begin[strlen(argv1_begin)]; + } + else ptr = argv1_begin; + + snprintf(ptr, (argv1_end - ptr) * sizeof(*ptr), "[%s]", cmd); + memset(argv1_begin + strlen(argv1_begin), '\0', + argv1_end - argv1_begin - strlen(argv1_begin)); +#endif +} + +static char *usage_string = +"User Mode Linux v%s\n" +" available at http://user-mode-linux.sourceforge.net/\n\n"; + +static int __init uml_version_setup(char *line, int *add) +{ + printf("%s\n", system_utsname.release); + exit(0); + + return 0; +} + +__uml_setup("--version", uml_version_setup, +"--version\n" +" Prints the version number of the kernel.\n\n" +); + +static int __init uml_root_setup(char *line, int *add) +{ + have_root = 1; + return 0; +} + +__uml_setup("root=", uml_root_setup, +"root=<file containing the root fs>\n" +" This is actually used by the generic kernel in exactly the same\n" +" way as in any other kernel. If you configure a number of block\n" +" devices and want to boot off something other than ubd0, you \n" +" would use something like:\n" +" root=/dev/ubd5\n\n" +); + +#ifdef CONFIG_SMP +static int __init uml_ncpus_setup(char *line, int *add) +{ + if (!sscanf(line, "%d", &ncpus)) { + printf("Couldn't parse [%s]\n", line); + return -1; + } + + return 0; +} + +__uml_setup("ncpus=", uml_ncpus_setup, +"ncpus=<# of desired CPUs>\n" +" This tells an SMP kernel how many virtual processors to start.\n\n" +); +#endif + +static int force_tt = 0; + +#if defined(CONFIG_MODE_TT) && defined(CONFIG_MODE_SKAS) +#define DEFAULT_TT 0 + +static int __init mode_tt_setup(char *line, int *add) +{ + force_tt = 1; + return(0); +} + +#else +#ifdef CONFIG_MODE_SKAS + +#define DEFAULT_TT 0 + +static int __init mode_tt_setup(char *line, int *add) +{ + printf("CONFIG_MODE_TT disabled - 'mode=tt' ignored\n"); + return(0); +} + +#else +#ifdef CONFIG_MODE_TT + +#define DEFAULT_TT 1 + +static int __init mode_tt_setup(char *line, int *add) +{ + printf("CONFIG_MODE_SKAS disabled - 'mode=tt' redundant\n"); + return(0); +} + +#else + +#error Either CONFIG_MODE_TT or CONFIG_MODE_SKAS must be enabled + +#endif +#endif +#endif + +__uml_setup("mode=tt", mode_tt_setup, +"mode=tt\n" +" When both CONFIG_MODE_TT and CONFIG_MODE_SKAS are enabled, this option\n" +" forces UML to run in tt (tracing thread) mode. It is not the default\n" +" because it's slower and less secure than skas mode.\n\n" +); + +int mode_tt = DEFAULT_TT; + +static int __init Usage(char *line, int *add) +{ + const char **p; + + printf(usage_string, system_utsname.release); + p = &__uml_help_start; + while (p < &__uml_help_end) { + printf("%s", *p); + p++; + } + exit(0); + + return 0; +} + +__uml_setup("--help", Usage, +"--help\n" +" Prints this message.\n\n" +); + +static int __init uml_checksetup(char *line, int *add) +{ + struct uml_param *p; + + p = &__uml_setup_start; + while(p < &__uml_setup_end) { + int n; + + n = strlen(p->str); + if(!strncmp(line, p->str, n)){ + if (p->setup_func(line + n, add)) return 1; + } + p++; + } + return 0; +} + +static void __init uml_postsetup(void) +{ + initcall_t *p; + + p = &__uml_postsetup_start; + while(p < &__uml_postsetup_end){ + (*p)(); + p++; + } + return; +} + +/* Set during early boot */ +unsigned long brk_start; +unsigned long end_iomem; +EXPORT_SYMBOL(end_iomem); + +#define MIN_VMALLOC (32 * 1024 * 1024) + +int linux_main(int argc, char **argv) +{ + unsigned long avail, diff; + unsigned long virtmem_size, max_physmem; + unsigned int i, add; + + for (i = 1; i < argc; i++){ + if((i == 1) && (argv[i][0] == ' ')) continue; + add = 1; + uml_checksetup(argv[i], &add); + if (add) + add_arg(argv[i]); + } + if(have_root == 0) + add_arg(DEFAULT_COMMAND_LINE); + + mode_tt = force_tt ? 1 : !can_do_skas(); +#ifndef CONFIG_MODE_TT + if (mode_tt) { + /*Since CONFIG_MODE_TT is #undef'ed, force_tt cannot be 1. So, + * can_do_skas() returned 0, and the message is correct. */ + printf("Support for TT mode is disabled, and no SKAS support is present on the host.\n"); + exit(1); + } +#endif + uml_start = CHOOSE_MODE_PROC(set_task_sizes_tt, set_task_sizes_skas, 0, + &host_task_size, &task_size); + + /* Need to check this early because mmapping happens before the + * kernel is running. + */ + check_tmpexec(); + + brk_start = (unsigned long) sbrk(0); + CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start); + /* Increase physical memory size for exec-shield users + so they actually get what they asked for. This should + add zero for non-exec shield users */ + + diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); + if(diff > 1024 * 1024){ + printf("Adding %ld bytes to physical memory to account for " + "exec-shield gap\n", diff); + physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end); + } + + uml_physmem = uml_start; + + /* Reserve up to 4M after the current brk */ + uml_reserved = ROUND_4M(brk_start) + (1 << 22); + + setup_machinename(system_utsname.machine); + +#ifdef CONFIG_MODE_TT + argv1_begin = argv[1]; + argv1_end = &argv[1][strlen(argv[1])]; +#endif + + highmem = 0; + iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK; + max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC; + + /* Zones have to begin on a 1 << MAX_ORDER page boundary, + * so this makes sure that's true for highmem + */ + max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1); + if(physmem_size + iomem_size > max_physmem){ + highmem = physmem_size + iomem_size - max_physmem; + physmem_size -= highmem; +#ifndef CONFIG_HIGHMEM + highmem = 0; + printf("CONFIG_HIGHMEM not enabled - physical memory shrunk " + "to %ld bytes\n", physmem_size); +#endif + } + + high_physmem = uml_physmem + physmem_size; + end_iomem = high_physmem + iomem_size; + high_memory = (void *) end_iomem; + + start_vm = VMALLOC_START; + + setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem); + if(init_maps(physmem_size, iomem_size, highmem)){ + printf("Failed to allocate mem_map for %ld bytes of physical " + "memory and %ld bytes of highmem\n", physmem_size, + highmem); + exit(1); + } + + virtmem_size = physmem_size; + avail = get_kmem_end() - start_vm; + if(physmem_size > avail) virtmem_size = avail; + end_vm = start_vm + virtmem_size; + + if(virtmem_size < physmem_size) + printf("Kernel virtual memory size shrunk to %ld bytes\n", + virtmem_size); + + uml_postsetup(); + + task_protections((unsigned long) &init_thread_info); + os_flush_stdout(); + + return(CHOOSE_MODE(start_uml_tt(), start_uml_skas())); +} + +extern int uml_exitcode; + +static int panic_exit(struct notifier_block *self, unsigned long unused1, + void *unused2) +{ + bust_spinlocks(1); + show_regs(&(current->thread.regs)); + bust_spinlocks(0); + uml_exitcode = 1; + machine_halt(); + return(0); +} + +static struct notifier_block panic_exit_notifier = { + .notifier_call = panic_exit, + .next = NULL, + .priority = 0 +}; + +void __init setup_arch(char **cmdline_p) +{ + notifier_chain_register(&panic_notifier_list, &panic_exit_notifier); + paging_init(); + strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE); + *cmdline_p = command_line; + setup_hostinfo(); +} + +void __init check_bugs(void) +{ + arch_check_bugs(); + check_ptrace(); + check_sigio(); + check_devanon(); +} + +void apply_alternatives(void *start, void *end) +{ +} |