cregit-Linux how code gets into the kernel

Release 4.14 arch/um/kernel/um_arch.c

Directory: arch/um/kernel
/*
 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include <linux/delay.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/string.h>
#include <linux/utsname.h>
#include <linux/sched.h>
#include <linux/sched/task.h>
#include <linux/kmsg_dump.h>

#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <as-layout.h>
#include <arch.h>
#include <init.h>
#include <kern.h>
#include <kern_util.h>
#include <mem_user.h>
#include <os.h>


#define DEFAULT_COMMAND_LINE "root=98:0"

/* Changed in add_arg and setup_arch, which run before SMP is started */

static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };


static void __init add_arg(char *arg) { if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) { os_warn("add_arg: Too many command line arguments!\n"); exit(1); } if (strlen(command_line) > 0) strcat(command_line, " "); strcat(command_line, arg); }

Contributors

PersonTokensPropCommitsCommitProp
Paolo 'Blaisorblade' Giarrusso5995.16%240.00%
Jeff Dike11.61%120.00%
Masami Hiramatsu11.61%120.00%
Alon Bar-Lev11.61%120.00%
Total62100.00%5100.00%

/* * These fields are initialized at boot time and not changed. * XXX This structure is used only in the non-SMP case. Maybe this * should be moved to smp.c. */ struct cpuinfo_um boot_cpu_data = { .loops_per_jiffy = 0, .ipi_pipe = { -1, -1 } }; union thread_union cpu0_irqstack __attribute__((__section__(".data..init_irqstack"))) = { INIT_THREAD_INFO(init_task) }; /* Changed in setup_arch, which is called in early boot */ static char host_info[(__NEW_UTS_LEN + 1) * 5];
static int show_cpuinfo(struct seq_file *m, void *v) { int index = 0; 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: skas\n"); 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; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Dike4853.93%266.67%
Paolo 'Blaisorblade' Giarrusso4146.07%133.33%
Total89100.00%3100.00%


static void *c_start(struct seq_file *m, loff_t *pos) { return *pos < NR_CPUS ? cpu_data + *pos : NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Dike29100.00%1100.00%
Total29100.00%1100.00%


static void *c_next(struct seq_file *m, void *v, loff_t *pos) { ++*pos; return c_start(m, pos); }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Dike32100.00%1100.00%
Total32100.00%1100.00%


static void c_stop(struct seq_file *m, void *v) { }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Dike14100.00%1100.00%
Total14100.00%1100.00%

const struct seq_operations cpuinfo_op = { .start = c_start, .next = c_next, .stop = c_stop, .show = show_cpuinfo, }; /* Set in linux_main */ unsigned long uml_physmem; EXPORT_SYMBOL(uml_physmem); unsigned long uml_reserved; /* Also modified in mem_init */ unsigned long start_vm; unsigned long end_vm; /* Set in uml_ncpus_setup */ int ncpus = 1; /* Set in early boot */ static int have_root __initdata = 0; /* Set in uml_mem_setup and modified in linux_main */ long long physmem_size = 32 * 1024 * 1024; static const 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) { /* Explicitly use printf() to show version in stdout */ printf("%s\n", init_utsname()->release); exit(0); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Dike3088.24%250.00%
Serge E. Hallyn38.82%125.00%
Masami Hiramatsu12.94%125.00%
Total34100.00%4100.00%

__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; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Dike22100.00%1100.00%
Total22100.00%1100.00%

__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" );
static int __init no_skas_debug_setup(char *line, int *add) { os_warn("'debug' is not necessary to gdb UML in skas mode - run\n"); os_warn("'gdb linux'\n"); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Dike2589.29%266.67%
Masami Hiramatsu310.71%133.33%
Total28100.00%3100.00%

__uml_setup("debug", no_skas_debug_setup, "debug\n" " this flag is not needed to run gdb on UML in skas mode\n\n" );
static int __init Usage(char *line, int *add) { const char **p; printf(usage_string, init_utsname()->release); p = &__uml_help_start; /* Explicitly use printf() to show help in stdout */ while (p < &__uml_help_end) { printf("%s", *p); p++; } exit(0); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Dike6193.85%250.00%
Serge E. Hallyn34.62%125.00%
Masami Hiramatsu11.54%125.00%
Total65100.00%4100.00%

__uml_setup("--help", Usage, "--help\n" " Prints this message.\n\n" );
static void __init uml_checksetup(char *line, int *add) { struct uml_param *p; p = &__uml_setup_start; while (p < &__uml_setup_end) { size_t n; n = strlen(p->str); if (!strncmp(line, p->str, n) && p->setup_func(line + n, add)) return; p++; } }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Dike7296.00%250.00%
Karol Swietlicki22.67%125.00%
Américo Wang11.33%125.00%
Total75100.00%4100.00%


static void __init uml_postsetup(void) { initcall_t *p; p = &__uml_postsetup_start; while (p < &__uml_postsetup_end) { (*p)(); p++; } return; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Dike37100.00%1100.00%
Total37100.00%1100.00%


static int panic_exit(struct notifier_block *self, unsigned long unused1, void *unused2) { kmsg_dump(KMSG_DUMP_PANIC); bust_spinlocks(1); bust_spinlocks(0); uml_exitcode = 1; os_dump_core(); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Dike3988.64%150.00%
Thomas Meyer511.36%150.00%
Total44100.00%2100.00%

static struct notifier_block panic_exit_notifier = { .notifier_call = panic_exit, .next = NULL, .priority = 0 };
void uml_finishsetup(void) { atomic_notifier_chain_register(&panic_notifier_list, &panic_exit_notifier); uml_postsetup(); new_thread_handler(); }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Meyer22100.00%1100.00%
Total22100.00%1100.00%

/* Set during early boot */ unsigned long task_size; EXPORT_SYMBOL(task_size); unsigned long host_task_size; unsigned long brk_start; unsigned long end_iomem; EXPORT_SYMBOL(end_iomem); #define MIN_VMALLOC (32 * 1024 * 1024)
int __init linux_main(int argc, char **argv) { unsigned long avail, diff; unsigned long virtmem_size, max_physmem; unsigned long stack; unsigned int i; int 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); host_task_size = os_get_top_address(); /* * TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps * out */ task_size = host_task_size & PGDIR_MASK; /* OS sanity checks that need to happen before the kernel runs */ os_early_checks(); brk_start = (unsigned long) sbrk(0); /* * 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) { os_info("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 = (unsigned long) __binary_start & PAGE_MASK; /* Reserve up to 4M after the current brk */ uml_reserved = ROUND_4M(brk_start) + (1 << 22); setup_machinename(init_utsname()->machine); highmem = 0; iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK; max_physmem = TASK_SIZE - 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; } high_physmem = uml_physmem + physmem_size; end_iomem = high_physmem + iomem_size; high_memory = (void *) end_iomem; start_vm = VMALLOC_START; virtmem_size = physmem_size; stack = (unsigned long) argv; stack &= ~(1024 * 1024 - 1); avail = stack - start_vm; if (physmem_size > avail) virtmem_size = avail; end_vm = start_vm + virtmem_size; if (virtmem_size < physmem_size) os_info("Kernel virtual memory size shrunk to %lu bytes\n", virtmem_size); os_flush_stdout(); return start_uml(); }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Dike31384.59%1161.11%
Paolo 'Blaisorblade' Giarrusso4512.16%15.56%
Serge E. Hallyn30.81%15.56%
Gennady Sharapov30.81%15.56%
Américo Wang20.54%15.56%
Masami Hiramatsu20.54%15.56%
Alon Bar-Lev10.27%15.56%
Tom Spink10.27%15.56%
Total370100.00%18100.00%


int __init __weak read_initrd(void) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Masami Hiramatsu12100.00%1100.00%
Total12100.00%1100.00%


void __init setup_arch(char **cmdline_p) { stack_protections((unsigned long) &init_thread_info); setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem); mem_total_pages(physmem_size, iomem_size, highmem); read_initrd(); paging_init(); strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); *cmdline_p = command_line; setup_hostinfo(host_info, sizeof host_info); }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Dike3246.38%233.33%
Richard Weinberger3043.48%116.67%
Paolo 'Blaisorblade' Giarrusso34.35%116.67%
Masami Hiramatsu34.35%116.67%
Alon Bar-Lev11.45%116.67%
Total69100.00%6100.00%


void __init check_bugs(void) { arch_check_bugs(); os_check_bugs(); }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Dike1285.71%266.67%
Paolo 'Blaisorblade' Giarrusso214.29%133.33%
Total14100.00%3100.00%


void apply_alternatives(struct alt_instr *start, struct alt_instr *end) { }

Contributors

PersonTokensPropCommitsCommitProp
Paolo 'Blaisorblade' Giarrusso1071.43%150.00%
Gerd Hoffmann428.57%150.00%
Total14100.00%2100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Jeff Dike102175.57%2754.00%
Paolo 'Blaisorblade' Giarrusso17412.88%36.00%
Thomas Meyer302.22%24.00%
Richard Weinberger302.22%12.00%
Thomas Gleixner231.70%12.00%
Masami Hiramatsu231.70%36.00%
Al Viro120.89%24.00%
Serge E. Hallyn90.67%12.00%
Gerd Knorr50.37%12.00%
Alon Bar-Lev40.30%24.00%
Gerd Hoffmann40.30%12.00%
Américo Wang40.30%12.00%
Ingo Molnar30.22%12.00%
Gennady Sharapov30.22%12.00%
Geert Uytterhoeven30.22%12.00%
Karol Swietlicki20.15%12.00%
Tom Spink10.07%12.00%
Total1351100.00%50100.00%
Directory: arch/um/kernel
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