mirror of
https://github.com/xen-project/xen.git
synced 2026-10-28 02:01:24 +01:00
smh22@boulderdash.cl.cam.ac.uk
5af0f07028
Initial 'debugging' support (aka keyboard and serial rx int handlers :-) Also current state of Alex's IDE stuff (not yet completely working). You need to config this up to use it.
872 lines
19 KiB
C
872 lines
19 KiB
C
/*
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* linux/init/main.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* GK 2/5/95 - Changed to support mounting root fs via NFS
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* Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96
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* Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96
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* Simplified starting of init: Michael A. Griffith <grif@acm.org>
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*/
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#define __KERNEL_SYSCALLS__
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#include <linux/config.h>
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#include <linux/proc_fs.h>
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#include <linux/devfs_fs_kernel.h>
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#include <linux/unistd.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/delay.h>
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#include <linux/utsname.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/smp_lock.h>
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#include <linux/blk.h>
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#include <linux/hdreg.h>
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#include <linux/iobuf.h>
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#include <linux/bootmem.h>
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#include <linux/tty.h>
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#include <asm/io.h>
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#include <asm/bugs.h>
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#if defined(CONFIG_ARCH_S390)
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#include <asm/s390mach.h>
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#include <asm/ccwcache.h>
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#endif
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#ifdef CONFIG_PCI
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#include <linux/pci.h>
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#endif
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#ifdef CONFIG_DIO
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#include <linux/dio.h>
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#endif
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#ifdef CONFIG_ZORRO
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#include <linux/zorro.h>
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#endif
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#ifdef CONFIG_MTRR
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# include <asm/mtrr.h>
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#endif
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#ifdef CONFIG_NUBUS
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#include <linux/nubus.h>
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#endif
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#ifdef CONFIG_ISAPNP
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#include <linux/isapnp.h>
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#endif
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#ifdef CONFIG_IRDA
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extern int irda_proto_init(void);
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extern int irda_device_init(void);
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#endif
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#ifdef CONFIG_X86_LOCAL_APIC
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#include <asm/smp.h>
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#endif
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#if defined(CONFIG_KDB)
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#include <linux/kdb.h>
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#endif
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/*
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* Versions of gcc older than that listed below may actually compile
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* and link okay, but the end product can have subtle run time bugs.
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* To avoid associated bogus bug reports, we flatly refuse to compile
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* with a gcc that is known to be too old from the very beginning.
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*/
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#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 91)
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#error Sorry, your GCC is too old. It builds incorrect kernels.
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#endif
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extern char _stext, _etext;
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extern char *linux_banner;
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static int init(void *);
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extern void init_IRQ(void);
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extern void init_modules(void);
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extern void sock_init(void);
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extern void fork_init(unsigned long);
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extern void mca_init(void);
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extern void sbus_init(void);
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extern void ppc_init(void);
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extern void sysctl_init(void);
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extern void signals_init(void);
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extern int init_pcmcia_ds(void);
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extern void free_initmem(void);
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#ifdef CONFIG_TC
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extern void tc_init(void);
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#endif
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extern void ecard_init(void);
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#if defined(CONFIG_SYSVIPC)
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extern void ipc_init(void);
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#endif
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/*
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* Boot command-line arguments
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*/
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#define MAX_INIT_ARGS 8
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#define MAX_INIT_ENVS 8
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extern void time_init(void);
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extern void softirq_init(void);
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int rows, cols;
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#ifdef CONFIG_BLK_DEV_INITRD
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unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */
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#endif
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int root_mountflags = MS_RDONLY;
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char *execute_command;
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char root_device_name[64];
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static char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
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static char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
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static int __init profile_setup(char *str)
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{
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int par;
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if (get_option(&str,&par)) prof_shift = par;
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return 1;
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}
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__setup("profile=", profile_setup);
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static struct dev_name_struct {
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const char *name;
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const int num;
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} root_dev_names[] __initdata = {
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{ "nfs", 0x00ff },
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{ "blk", 0x7b00 },
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{ "hda", 0x0300 },
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{ "hdb", 0x0340 },
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{ "loop", 0x0700 },
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{ "hdc", 0x1600 },
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{ "hdd", 0x1640 },
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{ "hde", 0x2100 },
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{ "hdf", 0x2140 },
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{ "hdg", 0x2200 },
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{ "hdh", 0x2240 },
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{ "hdi", 0x3800 },
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{ "hdj", 0x3840 },
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{ "hdk", 0x3900 },
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{ "hdl", 0x3940 },
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{ "hdm", 0x5800 },
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{ "hdn", 0x5840 },
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{ "hdo", 0x5900 },
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{ "hdp", 0x5940 },
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{ "hdq", 0x5A00 },
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{ "hdr", 0x5A40 },
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{ "hds", 0x5B00 },
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{ "hdt", 0x5B40 },
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{ "sda", 0x0800 },
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{ "sdb", 0x0810 },
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{ "sdc", 0x0820 },
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{ "sdd", 0x0830 },
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{ "sde", 0x0840 },
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{ "sdf", 0x0850 },
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{ "sdg", 0x0860 },
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{ "sdh", 0x0870 },
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{ "sdi", 0x0880 },
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{ "sdj", 0x0890 },
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{ "sdk", 0x08a0 },
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{ "sdl", 0x08b0 },
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{ "sdm", 0x08c0 },
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{ "sdn", 0x08d0 },
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{ "sdo", 0x08e0 },
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{ "sdp", 0x08f0 },
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{ "ada", 0x1c00 },
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{ "adb", 0x1c10 },
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{ "adc", 0x1c20 },
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{ "add", 0x1c30 },
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{ "ade", 0x1c40 },
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{ "fd", 0x0200 },
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{ "md", 0x0900 },
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{ "xda", 0x0d00 },
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{ "xdb", 0x0d40 },
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{ "ram", 0x0100 },
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{ "scd", 0x0b00 },
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{ "mcd", 0x1700 },
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{ "cdu535", 0x1800 },
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{ "sonycd", 0x1800 },
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{ "aztcd", 0x1d00 },
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{ "cm206cd", 0x2000 },
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{ "gscd", 0x1000 },
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{ "sbpcd", 0x1900 },
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{ "eda", 0x2400 },
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{ "edb", 0x2440 },
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{ "pda", 0x2d00 },
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{ "pdb", 0x2d10 },
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{ "pdc", 0x2d20 },
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{ "pdd", 0x2d30 },
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{ "pcd", 0x2e00 },
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{ "pf", 0x2f00 },
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{ "apblock", APBLOCK_MAJOR << 8},
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{ "ddv", DDV_MAJOR << 8},
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{ "jsfd", JSFD_MAJOR << 8},
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#if defined(CONFIG_ARCH_S390)
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{ "dasda", (DASD_MAJOR << MINORBITS) },
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{ "dasdb", (DASD_MAJOR << MINORBITS) + (1 << 2) },
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{ "dasdc", (DASD_MAJOR << MINORBITS) + (2 << 2) },
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{ "dasdd", (DASD_MAJOR << MINORBITS) + (3 << 2) },
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{ "dasde", (DASD_MAJOR << MINORBITS) + (4 << 2) },
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{ "dasdf", (DASD_MAJOR << MINORBITS) + (5 << 2) },
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{ "dasdg", (DASD_MAJOR << MINORBITS) + (6 << 2) },
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{ "dasdh", (DASD_MAJOR << MINORBITS) + (7 << 2) },
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#endif
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#if defined(CONFIG_BLK_CPQ_DA) || defined(CONFIG_BLK_CPQ_DA_MODULE)
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{ "ida/c0d0p",0x4800 },
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{ "ida/c0d1p",0x4810 },
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{ "ida/c0d2p",0x4820 },
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{ "ida/c0d3p",0x4830 },
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{ "ida/c0d4p",0x4840 },
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{ "ida/c0d5p",0x4850 },
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{ "ida/c0d6p",0x4860 },
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{ "ida/c0d7p",0x4870 },
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{ "ida/c0d8p",0x4880 },
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{ "ida/c0d9p",0x4890 },
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{ "ida/c0d10p",0x48A0 },
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{ "ida/c0d11p",0x48B0 },
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{ "ida/c0d12p",0x48C0 },
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{ "ida/c0d13p",0x48D0 },
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{ "ida/c0d14p",0x48E0 },
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{ "ida/c0d15p",0x48F0 },
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#endif
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#if defined(CONFIG_BLK_CPQ_CISS_DA) || defined(CONFIG_BLK_CPQ_CISS_DA_MODULE)
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{ "cciss/c0d0p",0x6800 },
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{ "cciss/c0d1p",0x6810 },
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{ "cciss/c0d2p",0x6820 },
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{ "cciss/c0d3p",0x6830 },
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{ "cciss/c0d4p",0x6840 },
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{ "cciss/c0d5p",0x6850 },
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{ "cciss/c0d6p",0x6860 },
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{ "cciss/c0d7p",0x6870 },
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{ "cciss/c0d8p",0x6880 },
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{ "cciss/c0d9p",0x6890 },
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{ "cciss/c0d10p",0x68A0 },
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{ "cciss/c0d11p",0x68B0 },
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{ "cciss/c0d12p",0x68C0 },
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{ "cciss/c0d13p",0x68D0 },
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{ "cciss/c0d14p",0x68E0 },
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{ "cciss/c0d15p",0x68F0 },
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#endif
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{ "nftla", 0x5d00 },
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{ "nftlb", 0x5d10 },
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{ "nftlc", 0x5d20 },
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{ "nftld", 0x5d30 },
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{ "ftla", 0x2c00 },
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{ "ftlb", 0x2c08 },
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{ "ftlc", 0x2c10 },
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{ "ftld", 0x2c18 },
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{ "mtdblock", 0x1f00 },
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{ NULL, 0 }
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};
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kdev_t __init name_to_kdev_t(char *line)
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{
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int base = 0;
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if (strncmp(line,"/dev/",5) == 0) {
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struct dev_name_struct *dev = root_dev_names;
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line += 5;
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do {
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int len = strlen(dev->name);
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if (strncmp(line,dev->name,len) == 0) {
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line += len;
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base = dev->num;
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break;
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}
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dev++;
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} while (dev->name);
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}
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return to_kdev_t(base + simple_strtoul(line,NULL,base?10:16));
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}
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static int __init root_dev_setup(char *line)
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{
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int i;
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char ch;
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ROOT_DEV = name_to_kdev_t(line);
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memset (root_device_name, 0, sizeof root_device_name);
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if (strncmp (line, "/dev/", 5) == 0) line += 5;
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for (i = 0; i < sizeof root_device_name - 1; ++i)
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{
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ch = line[i];
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if ( isspace (ch) || (ch == ',') || (ch == '\0') ) break;
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root_device_name[i] = ch;
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}
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return 1;
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}
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__setup("root=", root_dev_setup);
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static int __init checksetup(char *line)
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{
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struct kernel_param *p;
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p = &__setup_start;
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do {
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int n = strlen(p->str);
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if (!strncmp(line,p->str,n)) {
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if (p->setup_func(line+n))
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return 1;
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}
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p++;
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} while (p < &__setup_end);
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return 0;
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}
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/* this should be approx 2 Bo*oMips to start (note initial shift), and will
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still work even if initially too large, it will just take slightly longer */
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unsigned long loops_per_jiffy = (1<<12);
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/* This is the number of bits of precision for the loops_per_jiffy. Each
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bit takes on average 1.5/HZ seconds. This (like the original) is a little
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better than 1% */
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#define LPS_PREC 8
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void __init calibrate_delay(void)
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{
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unsigned long ticks, loopbit;
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int lps_precision = LPS_PREC;
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loops_per_jiffy = (1<<12);
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printk("Calibrating delay loop... ");
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while (loops_per_jiffy <<= 1) {
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/* wait for "start of" clock tick */
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ticks = jiffies;
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while (ticks == jiffies)
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/* nothing */;
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/* Go .. */
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ticks = jiffies;
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__delay(loops_per_jiffy);
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ticks = jiffies - ticks;
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if (ticks)
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break;
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}
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/* Do a binary approximation to get loops_per_jiffy set to equal one clock
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(up to lps_precision bits) */
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loops_per_jiffy >>= 1;
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loopbit = loops_per_jiffy;
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while ( lps_precision-- && (loopbit >>= 1) ) {
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loops_per_jiffy |= loopbit;
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ticks = jiffies;
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while (ticks == jiffies);
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ticks = jiffies;
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__delay(loops_per_jiffy);
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if (jiffies != ticks) /* longer than 1 tick */
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loops_per_jiffy &= ~loopbit;
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}
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/* Round the value and print it */
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printk("%lu.%02lu BogoMIPS\n",
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loops_per_jiffy/(500000/HZ),
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(loops_per_jiffy/(5000/HZ)) % 100);
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}
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static int __init readonly(char *str)
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{
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if (*str)
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return 0;
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root_mountflags |= MS_RDONLY;
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return 1;
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}
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static int __init readwrite(char *str)
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{
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if (*str)
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return 0;
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root_mountflags &= ~MS_RDONLY;
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return 1;
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}
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static int __init debug_kernel(char *str)
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{
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if (*str)
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return 0;
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console_loglevel = 10;
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return 1;
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}
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static int __init quiet_kernel(char *str)
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{
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if (*str)
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return 0;
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console_loglevel = 4;
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return 1;
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}
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__setup("ro", readonly);
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__setup("rw", readwrite);
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__setup("debug", debug_kernel);
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__setup("quiet", quiet_kernel);
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/*
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* This is a simple kernel command line parsing function: it parses
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* the command line, and fills in the arguments/environment to init
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* as appropriate. Any cmd-line option is taken to be an environment
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* variable if it contains the character '='.
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*
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* This routine also checks for options meant for the kernel.
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* These options are not given to init - they are for internal kernel use only.
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*/
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static void __init parse_options(char *line)
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{
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char *next,*quote;
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int args, envs;
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if (!*line)
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return;
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args = 0;
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envs = 1; /* TERM is set to 'linux' by default */
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next = line;
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while ((line = next) != NULL) {
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quote = strchr(line,'"');
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next = strchr(line, ' ');
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while (next != NULL && quote != NULL && quote < next) {
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/* we found a left quote before the next blank
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* now we have to find the matching right quote
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*/
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next = strchr(quote+1, '"');
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if (next != NULL) {
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quote = strchr(next+1, '"');
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next = strchr(next+1, ' ');
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}
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}
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if (next != NULL)
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*next++ = 0;
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#if defined(CONFIG_KDB)
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/* kdb, kdb=on, kdb=off, kdb=early */
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if (strncmp(line, "kdb", 3) == 0) {
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if (line[3] == '\0') {
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/* Backward compatibility, kdb with no option means early activation */
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printk("Boot flag kdb with no options is obsolete, use kdb=early\n");
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kdb_on = 1;
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kdb_flags |= KDB_FLAG_EARLYKDB;
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continue;
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}
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if (line[3] == '=') {
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if (strcmp(line+4, "on") == 0) {
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kdb_on = 1;
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continue;
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}
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if (strcmp(line+4, "off") == 0) {
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kdb_on = 0;
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continue;
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}
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if (strcmp(line+4, "early") == 0) {
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kdb_on = 1;
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kdb_flags |= KDB_FLAG_EARLYKDB;
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continue;
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}
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printk("Boot flag %s not recognised, assumed to be environment variable\n", line);
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}
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}
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#endif
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if (!strncmp(line,"init=",5)) {
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line += 5;
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execute_command = line;
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/* In case LILO is going to boot us with default command line,
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* it prepends "auto" before the whole cmdline which makes
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* the shell think it should execute a script with such name.
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* So we ignore all arguments entered _before_ init=... [MJ]
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*/
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args = 0;
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continue;
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}
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if (checksetup(line))
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continue;
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|
|
|
/*
|
|
* Then check if it's an environment variable or
|
|
* an option.
|
|
*/
|
|
if (strchr(line,'=')) {
|
|
if (envs >= MAX_INIT_ENVS)
|
|
break;
|
|
envp_init[++envs] = line;
|
|
} else {
|
|
if (args >= MAX_INIT_ARGS)
|
|
break;
|
|
if (*line)
|
|
argv_init[++args] = line;
|
|
}
|
|
}
|
|
argv_init[args+1] = NULL;
|
|
envp_init[envs+1] = NULL;
|
|
}
|
|
|
|
|
|
extern void setup_arch(char **);
|
|
extern void cpu_idle(void);
|
|
|
|
unsigned long wait_init_idle;
|
|
|
|
#ifndef CONFIG_SMP
|
|
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
static void __init smp_init(void)
|
|
{
|
|
APIC_init_uniprocessor();
|
|
}
|
|
#else
|
|
#define smp_init() do { } while (0)
|
|
#endif
|
|
|
|
#else
|
|
|
|
|
|
/* Called by boot processor to activate the rest. */
|
|
static void __init smp_init(void)
|
|
{
|
|
/* Get other processors into their bootup holding patterns. */
|
|
smp_boot_cpus();
|
|
wait_init_idle = cpu_online_map;
|
|
clear_bit(current->processor, &wait_init_idle); /* Don't wait on me! */
|
|
|
|
smp_threads_ready=1;
|
|
smp_commence();
|
|
|
|
/* Wait for the other cpus to set up their idle processes */
|
|
printk("Waiting on wait_init_idle (map = 0x%lx)\n", wait_init_idle);
|
|
while (wait_init_idle) {
|
|
cpu_relax();
|
|
barrier();
|
|
}
|
|
printk("All processors have done init_idle\n");
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* We need to finalize in a non-__init function or else race conditions
|
|
* between the root thread and the init thread may cause start_kernel to
|
|
* be reaped by free_initmem before the root thread has proceeded to
|
|
* cpu_idle.
|
|
*/
|
|
|
|
static void rest_init(void)
|
|
{
|
|
kernel_thread(init, NULL, CLONE_FS | CLONE_FILES | CLONE_SIGNAL);
|
|
unlock_kernel();
|
|
current->need_resched = 1;
|
|
cpu_idle();
|
|
}
|
|
|
|
/*
|
|
* Activate the first processor.
|
|
*/
|
|
|
|
asmlinkage void __init start_kernel(void)
|
|
{
|
|
char * command_line;
|
|
unsigned long mempages;
|
|
extern char saved_command_line[];
|
|
/*
|
|
* Interrupts are still disabled. Do necessary setups, then
|
|
* enable them
|
|
*/
|
|
lock_kernel();
|
|
printk(linux_banner);
|
|
setup_arch(&command_line);
|
|
printk("Kernel command line: %s\n", saved_command_line);
|
|
parse_options(command_line);
|
|
trap_init();
|
|
init_IRQ();
|
|
sched_init();
|
|
softirq_init();
|
|
time_init();
|
|
|
|
/*
|
|
* HACK ALERT! This is early. We're enabling the console before
|
|
* we've done PCI setups etc, and console_init() must be aware of
|
|
* this. But we do want output early, in case something goes wrong.
|
|
*/
|
|
console_init();
|
|
#ifdef CONFIG_MODULES
|
|
init_modules();
|
|
#endif
|
|
if (prof_shift) {
|
|
unsigned int size;
|
|
/* only text is profiled */
|
|
prof_len = (unsigned long) &_etext - (unsigned long) &_stext;
|
|
prof_len >>= prof_shift;
|
|
|
|
size = prof_len * sizeof(unsigned int) + PAGE_SIZE-1;
|
|
prof_buffer = (unsigned int *) alloc_bootmem(size);
|
|
}
|
|
|
|
kmem_cache_init();
|
|
sti();
|
|
calibrate_delay();
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
if (initrd_start && !initrd_below_start_ok &&
|
|
initrd_start < min_low_pfn << PAGE_SHIFT) {
|
|
printk(KERN_CRIT "initrd overwritten (0x%08lx < 0x%08lx) - "
|
|
"disabling it.\n",initrd_start,min_low_pfn << PAGE_SHIFT);
|
|
initrd_start = 0;
|
|
}
|
|
#endif
|
|
mem_init();
|
|
kmem_cache_sizes_init();
|
|
#if defined(CONFIG_KDB)
|
|
kdb_init();
|
|
if (KDB_FLAG(EARLYKDB)) {
|
|
KDB_ENTER();
|
|
}
|
|
#endif
|
|
mempages = num_physpages;
|
|
|
|
fork_init(mempages);
|
|
proc_caches_init();
|
|
vfs_caches_init(mempages);
|
|
buffer_init(mempages);
|
|
page_cache_init(mempages);
|
|
#if defined(CONFIG_ARCH_S390)
|
|
ccwcache_init();
|
|
#endif
|
|
signals_init();
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_root_init();
|
|
#endif
|
|
#if defined(CONFIG_SYSVIPC)
|
|
ipc_init();
|
|
#endif
|
|
check_bugs();
|
|
printk("POSIX conformance testing by UNIFIX\n");
|
|
|
|
/*
|
|
* We count on the initial thread going ok
|
|
* Like idlers init is an unlocked kernel thread, which will
|
|
* make syscalls (and thus be locked).
|
|
*/
|
|
smp_init();
|
|
rest_init();
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
static int do_linuxrc(void * shell)
|
|
{
|
|
static char *argv[] = { "linuxrc", NULL, };
|
|
|
|
close(0);close(1);close(2);
|
|
setsid();
|
|
(void) open("/dev/console",O_RDWR,0);
|
|
(void) dup(0);
|
|
(void) dup(0);
|
|
return execve(shell, argv, envp_init);
|
|
}
|
|
|
|
#endif
|
|
|
|
struct task_struct *child_reaper = &init_task;
|
|
|
|
static void __init do_initcalls(void)
|
|
{
|
|
initcall_t *call;
|
|
|
|
call = &__initcall_start;
|
|
do {
|
|
(*call)();
|
|
call++;
|
|
} while (call < &__initcall_end);
|
|
|
|
/* Make sure there is no pending stuff from the initcall sequence */
|
|
flush_scheduled_tasks();
|
|
}
|
|
|
|
/*
|
|
* Ok, the machine is now initialized. None of the devices
|
|
* have been touched yet, but the CPU subsystem is up and
|
|
* running, and memory and process management works.
|
|
*
|
|
* Now we can finally start doing some real work..
|
|
*/
|
|
static void __init do_basic_setup(void)
|
|
{
|
|
|
|
/*
|
|
* Tell the world that we're going to be the grim
|
|
* reaper of innocent orphaned children.
|
|
*
|
|
* We don't want people to have to make incorrect
|
|
* assumptions about where in the task array this
|
|
* can be found.
|
|
*/
|
|
child_reaper = current;
|
|
|
|
#if defined(CONFIG_MTRR) /* Do this after SMP initialization */
|
|
/*
|
|
* We should probably create some architecture-dependent "fixup after
|
|
* everything is up" style function where this would belong better
|
|
* than in init/main.c..
|
|
*/
|
|
mtrr_init();
|
|
#endif
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
sysctl_init();
|
|
#endif
|
|
|
|
/*
|
|
* Ok, at this point all CPU's should be initialized, so
|
|
* we can start looking into devices..
|
|
*/
|
|
#if defined(CONFIG_ARCH_S390)
|
|
s390_init_machine_check();
|
|
#endif
|
|
|
|
#ifdef CONFIG_PCI
|
|
pci_init();
|
|
#endif
|
|
#ifdef CONFIG_SBUS
|
|
sbus_init();
|
|
#endif
|
|
#if defined(CONFIG_PPC)
|
|
ppc_init();
|
|
#endif
|
|
#ifdef CONFIG_MCA
|
|
mca_init();
|
|
#endif
|
|
#ifdef CONFIG_ARCH_ACORN
|
|
ecard_init();
|
|
#endif
|
|
#ifdef CONFIG_ZORRO
|
|
zorro_init();
|
|
#endif
|
|
#ifdef CONFIG_DIO
|
|
dio_init();
|
|
#endif
|
|
#ifdef CONFIG_NUBUS
|
|
nubus_init();
|
|
#endif
|
|
#ifdef CONFIG_ISAPNP
|
|
isapnp_init();
|
|
#endif
|
|
#ifdef CONFIG_TC
|
|
tc_init();
|
|
#endif
|
|
|
|
/* Networking initialization needs a process context */
|
|
sock_init();
|
|
|
|
start_context_thread();
|
|
do_initcalls();
|
|
|
|
#ifdef CONFIG_IRDA
|
|
irda_proto_init();
|
|
irda_device_init(); /* Must be done after protocol initialization */
|
|
#endif
|
|
#ifdef CONFIG_PCMCIA
|
|
init_pcmcia_ds(); /* Do this last */
|
|
#endif
|
|
}
|
|
|
|
extern void rd_load(void);
|
|
extern void initrd_load(void);
|
|
|
|
/*
|
|
* Prepare the namespace - decide what/where to mount, load ramdisks, etc.
|
|
*/
|
|
static void prepare_namespace(void)
|
|
{
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
int real_root_mountflags = root_mountflags;
|
|
if (!initrd_start)
|
|
mount_initrd = 0;
|
|
if (mount_initrd)
|
|
root_mountflags &= ~MS_RDONLY;
|
|
real_root_dev = ROOT_DEV;
|
|
#endif
|
|
|
|
#ifdef CONFIG_BLK_DEV_RAM
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
if (mount_initrd)
|
|
initrd_load();
|
|
else
|
|
#endif
|
|
rd_load();
|
|
#endif
|
|
|
|
/* Mount the root filesystem.. */
|
|
mount_root();
|
|
|
|
mount_devfs_fs ();
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
root_mountflags = real_root_mountflags;
|
|
if (mount_initrd && ROOT_DEV != real_root_dev
|
|
&& MAJOR(ROOT_DEV) == RAMDISK_MAJOR && MINOR(ROOT_DEV) == 0) {
|
|
int error;
|
|
int i, pid;
|
|
|
|
pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
|
|
if (pid > 0) {
|
|
while (pid != wait(&i)) {
|
|
current->policy |= SCHED_YIELD;
|
|
schedule();
|
|
}
|
|
}
|
|
if (MAJOR(real_root_dev) != RAMDISK_MAJOR
|
|
|| MINOR(real_root_dev) != 0) {
|
|
error = change_root(real_root_dev,"/initrd");
|
|
if (error)
|
|
printk(KERN_ERR "Change root to /initrd: "
|
|
"error %d\n",error);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static int init(void * unused)
|
|
{
|
|
lock_kernel();
|
|
do_basic_setup();
|
|
|
|
prepare_namespace();
|
|
|
|
/*
|
|
* Ok, we have completed the initial bootup, and
|
|
* we're essentially up and running. Get rid of the
|
|
* initmem segments and start the user-mode stuff..
|
|
*/
|
|
free_initmem();
|
|
unlock_kernel();
|
|
|
|
if (open("/dev/console", O_RDWR, 0) < 0)
|
|
printk("Warning: unable to open an initial console.\n");
|
|
|
|
(void) dup(0);
|
|
(void) dup(0);
|
|
|
|
/*
|
|
* We try each of these until one succeeds.
|
|
*
|
|
* The Bourne shell can be used instead of init if we are
|
|
* trying to recover a really broken machine.
|
|
*/
|
|
|
|
if (execute_command)
|
|
execve(execute_command,argv_init,envp_init);
|
|
execve("/sbin/init",argv_init,envp_init);
|
|
execve("/etc/init",argv_init,envp_init);
|
|
execve("/bin/init",argv_init,envp_init);
|
|
execve("/bin/sh",argv_init,envp_init);
|
|
panic("No init found. Try passing init= option to kernel.");
|
|
}
|