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467 lines
10 KiB
467 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
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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 <linux/sched.h> |
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#include <linux/sched/task.h> |
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#include <linux/kmsg_dump.h> |
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#include <linux/suspend.h> |
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#include <asm/processor.h> |
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#include <asm/sections.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 "root=98:0" |
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#define DEFAULT_COMMAND_LINE_CONSOLE "console=tty" |
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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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os_warn("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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union thread_union cpu0_irqstack |
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__section(".data..init_irqstack") = |
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{ .thread_info = INIT_THREAD_INFO(init_task) }; |
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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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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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EXPORT_SYMBOL(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; |
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static int have_console __initdata; |
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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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EXPORT_SYMBOL(physmem_size); |
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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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/* Explicitly use printf() to show version in stdout */ |
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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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os_warn("'debug' is not necessary to gdb UML in skas mode - run\n"); |
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os_warn("'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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static int __init uml_console_setup(char *line, int *add) |
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{ |
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have_console = 1; |
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return 0; |
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} |
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__uml_setup("console=", uml_console_setup, |
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"console=<preferred console>\n" |
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" Specify the preferred console output driver\n\n" |
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); |
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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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/* Explicitly use printf() to show help in stdout */ |
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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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kmsg_dump(KMSG_DUMP_PANIC); |
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bust_spinlocks(1); |
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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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void uml_finishsetup(void) |
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{ |
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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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new_thread_handler(); |
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} |
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/* Set during early boot */ |
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unsigned long stub_start; |
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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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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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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_ROOT); |
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if (have_console == 0) |
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add_arg(DEFAULT_COMMAND_LINE_CONSOLE); |
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host_task_size = os_get_top_address(); |
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/* reserve two pages for the stubs */ |
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host_task_size -= 2 * PAGE_SIZE; |
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stub_start = host_task_size; |
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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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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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os_info("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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} |
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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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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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os_info("Kernel virtual memory size shrunk to %lu bytes\n", |
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virtmem_size); |
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os_flush_stdout(); |
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return start_uml(); |
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} |
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int __init __weak read_initrd(void) |
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{ |
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return 0; |
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} |
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void __init setup_arch(char **cmdline_p) |
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{ |
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stack_protections((unsigned long) &init_thread_info); |
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setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem); |
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mem_total_pages(physmem_size, iomem_size, highmem); |
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read_initrd(); |
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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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void *text_poke(void *addr, const void *opcode, size_t len) |
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{ |
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/* |
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* In UML, the only reference to this function is in |
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* apply_relocate_add(), which shouldn't ever actually call this |
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* because UML doesn't have live patching. |
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*/ |
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WARN_ON(1); |
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return memcpy(addr, opcode, len); |
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} |
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void text_poke_sync(void) |
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{ |
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} |
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void uml_pm_wake(void) |
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{ |
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pm_system_wakeup(); |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int um_suspend_valid(suspend_state_t state) |
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{ |
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return state == PM_SUSPEND_MEM; |
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} |
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static int um_suspend_prepare(void) |
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{ |
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um_irqs_suspend(); |
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return 0; |
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} |
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static int um_suspend_enter(suspend_state_t state) |
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{ |
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if (WARN_ON(state != PM_SUSPEND_MEM)) |
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return -EINVAL; |
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/* |
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* This is identical to the idle sleep, but we've just |
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* (during suspend) turned off all interrupt sources |
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* except for the ones we want, so now we can only wake |
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* up on something we actually want to wake up on. All |
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* timing has also been suspended. |
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*/ |
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um_idle_sleep(); |
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return 0; |
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} |
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static void um_suspend_finish(void) |
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{ |
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um_irqs_resume(); |
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} |
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const struct platform_suspend_ops um_suspend_ops = { |
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.valid = um_suspend_valid, |
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.prepare = um_suspend_prepare, |
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.enter = um_suspend_enter, |
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.finish = um_suspend_finish, |
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}; |
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static int init_pm_wake_signal(void) |
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{ |
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/* |
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* In external time-travel mode we can't use signals to wake up |
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* since that would mess with the scheduling. We'll have to do |
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* some additional work to support wakeup on virtio devices or |
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* similar, perhaps implementing a fake RTC controller that can |
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* trigger wakeup (and request the appropriate scheduling from |
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* the external scheduler when going to suspend.) |
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*/ |
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if (time_travel_mode != TT_MODE_EXTERNAL) |
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register_pm_wake_signal(); |
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suspend_set_ops(&um_suspend_ops); |
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return 0; |
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} |
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late_initcall(init_pm_wake_signal); |
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#endif
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