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 * [http://d.hatena.ne.jp/daisukebe/20080301/p2 socket()システムコールがソケットを確保するまで - HDIF?]
 = tools =

 * [http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/SystemTap_Beginners_Guide/topsyssect.html 4.3.5. Tracking Most Frequently Used System Calls]
 * [https://wiki.ubuntu.com/Kernel/CrashdumpRecipe Kernel/CrashdumpRecipe - Ubuntu Wiki]
 > LKCD is a project that tries to enable enterprise style post-mortem crash analysis in Linux operating systems. It uses a special mode of kexec which allows to automatically boot a secondary kernel whenever a crash (Oops/panic) occurs. This secondary kernel will then save the state and memory of the primary kernel to a certain location of the filesystem (/var/crash on newer releases). This file can then be used by crash to gather detailed information about the problem.

 * [http://mikemira.blog29.fc2.com/blog-entry-87.html つれづれにっき　 Ubuntu 12.04でkdumpをとりたい]

 * github:penberg/linux-kvm/tree/master/tools/kvm
 > The goal of this tool is to provide a clean, from-scratch, lightweight
 > KVM host tool implementation that can boot Linux guest images (just a
 > hobby, won't be big and professional like QEMU) with no BIOS
 > dependencies and with only the minimal amount of legacy device
 > emulation.
  * twitter:fadis_/status/322973469979598848

 = how to build kernel =
 * Ubuntuの場合、{{{aptitude build-dep linux}}}でカーネルのビルドに必要なパッケージは導入される
  * 3.9.x以降をビルドする場合は、{{{bc}}}パッケージも必要
{{{
  BC      kernel/timeconst.h
/bin/sh: 1: bc: not found
make[3]: *** [kernel/timeconst.h] Error 127
make[2]: *** [kernel] Error 2
}}}

 * https://help.ubuntu.com/community/Kernel/Compile
  * This page does NOT describe how to build upstream kernels from kernel.org. This is how to rebuild the actual Ubuntu kernel starting from source.
 * [http://d.hatena.ne.jp/haradats/20070819 VMware上のUbuntuで最新カーネルをビルドする - よそ行き顔で]
 > * パッケージの導入
 >  * build-essential（これがなくては/usr/includeすらない）
 >  * kernel-package
 >  * libncurses5-dev（make menuconfigを行うために必要。本来kernel-packageに入っていると良いような気がする）
 >  * subversion, subversion-tools（TOMOYOのレポジトリの参照用）
 >  * quilt（もともとはAndrew Mortonが作成したパッチ管理用ツール。自分で使うことはないだろうけれども一応。依存関係でgawkとdiffstatが導入された）
 > もし、rootでコンパイルしたくなければfakerootもあると良い。
 * [http://d.hatena.ne.jp/adsaria/20081104/1225766991 Ubuntuのカーネル再構築 - adsaria mood]
 * [http://d.hatena.ne.jp/m-bird/20110805/1312507198 Linuxカーネルの再構築方法＠Debian Squeeze - m-birdとFreeBSDの同棲日記]

 * [http://tinkering-is-fun.blogspot.jp/2009/12/compiling-linux-kernel-for-x86-on-x8664.html Tinkering Is Fun: Compiling linux kernel for x86 on x86_64]
 > Experimenting further reveals that all that is needed is:
 > {{{
 > make ARCH=i386 <target>
 > }}}

 * カーネルソースを展開して、「make help」でmakeオプションが表示される

 == (example) build 3.6.1 on Ubuntu 12.04 and install to 12.10 ==
 * ソースの入手
  * mitty@precise:~$ wget http://www.kernel.org/pub/linux/kernel/v3.0/linux-3.6.1.tar.xz
  * mitty@precise:~$ tar xJf linux-3.6.1.tar.xz
 * ビルド環境構築
  * mitty@precise:~$ sudo aptitude build-dep linux
  * mitty@precise:~/linux-3.6.1$ scp mitty@quantal64:/boot/config-3.5.0-17-generic .config
 * ビルド
  * mitty@precise:~/linux-3.6.1$ make oldconfig
   * $ make oldnoconfig -> Same as silentoldconfig but sets new symbols to their default value
  * mitty@precise:~/linux-3.6.1$ make -j9 deb-pkg
 * debパッケージのインストール
  * mitty@precise:~$ scp linux-image-3.6.1_3.6.1-3_amd64.deb mitty@quantal64:~
  * mitty@quantal64:~$ sudo dpkg -i linux-image-3.6.1_3.6.1-3_amd64.deb

 = how to enhancement kernel =

 * [http://hekimian-williams.com/?p=20 Adding A System Call To Linux (Fedora 9) - Cory’s Place] Fedora 9 kernel 2.6.26 (i686)
 * [http://hira-consulting.com/wiki/ ようこそ - LinuxKernelHackJapan] 本サイトは、Linuxカーネル内部情報（総3,911ページ）の提供を目的としている。
 * [http://www.geocities.jp/dinone_01/linux_driver.html Linux　ドライバ作成　初心者編]
 * http://f42.aaa.livedoor.jp/~hassaku/crswikicrs/
 > * LinuxDeviceDriver
 * [http://www.hakodate-ct.ac.jp/~tokai/tokai/research/kmod.html カーネルモジュール作成メモ]
 * [http://www.ibm.com/developerworks/jp/linux/library/l-system-calls/ Linux システム・コールを使用したカーネル・コマンド]

 * [http://stackoverflow.com/questions/290898/overriding-functionality-with-modules-in-linux-kernel c - Overriding functionality with modules in Linux kernel - Stack Overflow]
 > the kernel has an interface called kprobes to do just what you needed.
 * http://stackoverflow.com/questions/463332/is-it-possible-to-add-a-system-call-via-a-lkm linux - Is it possible to add a system call via a LKM? - Stack Overflow

 = debugging Linux Kernel with VMware Workstation =
 * http://wiki.osdev.org/VMWare
 > * Guest debugging
 >   * These options are valid in Workstation 6.0+, and should be set in the virtual machine's .vmx file.
 > {{{
 > debugStub.listen.guest32 = "TRUE"
 > debugStub.listen.guest64 = "TRUE"
 > }}}
 >   * If using these options, Workstation prints a message "VMware Workstation is listening for debug connection on port 8832." into the vmware.log file. Start a GDB session (using a copy of your kernel that includes debug information), then:
 > {{{
 > target remote localhost:8832
 > }}}
 >   * Standard gdb commands work in this mode (e.g. printing memory, backtrace). Note that this is a debug stub attached to the KERNEL, not a userspace program.
 >   * Other useful options:
 > {{{
 > debugStub.listen.guest32.remote = "TRUE" # Allows debugging from a different computer / VM instead of localhost. # The IP for remote debugging will be that of the host.
 > debugStub.listen.guest64.remote = "TRUE" # Same, but for 64-bit code
 > monitor.debugOnStartGuest32 = "TRUE" # Breaks into debug stub on first instruction (warning: in BIOS!) # This will halt the VM at the very first instruction at 0xFFFF0, you could set the next breakpoint to break *0x7c00 to break when the bootloader is loaded by the BIOS
 > debugStub.hideBreakpoints = "TRUE" # Allows gdb breakpoints to work
 > bios.bootDelay = "3000" # Delay booting the BIOS code.
 > }}}

 * windellはVistaとのデュアルブートなため、UTCではなくlocal timeでRTCが設定されている
  * Ubuntu インストール時に、UTCにすると時計が9時間進む

 == x86 ==
 * http://archive.ubuntu.com/ubuntu/dists/lucid/main/installer-i386/current/images/netboot/mini.iso
 * Create a new VM
  * Ubuntu (not x64)
  * ubuntu-lucid
  * 1/1 cpu/core
  * 512MB
  * NAT
  * Buslogic

 == x64 ==
 * viola0![1-6]でビルドする場合、そのままではx86_64のカーネルが作られるので注意

 * http://archive.ubuntu.com/ubuntu/dists/lucid/main/installer-amd64/current/images/netboot/mini.iso
 * Create a new VM
  * Ubuntu 64-bit
  * ubuntu-lucid64
  * 1/1 cpu/core
  * 512MB
  * NAT
  * LSI Logic
   * BusLogicはx64ゲストでは使用出来ないとのこと

 * [http://blog.zhangsen.org/2008/12/how-to-add-syscall-on-x8664.html Jesse's Blog: how to add syscall on x86_64]
 * [http://forum.soft32.com/linux/system-call-implementation-x86_64-ftopict344646.html system call implementation for x86_64]

 = Serial Console =
 * https://www.kernel.org/doc/Documentation/serial-console.txt https://www.kernel.org/doc/Documentation/serial-console.txt
 * [http://www.aji.sakura.ne.jp/linux/kernel_options.html Linux カーネル 起動オプション]
 > {{{
 > console=tty0 console=ttyS0,115200n8r
 > }}}

 * see also wiki:TipAndDoc/VM/QEMU#ConsoleRedirection

 * http://qemu.weilnetz.de/qemu-doc.html#direct_005flinux_005fboot 3.9 Direct Linux Boot
 * ex) $ sudo qemu-system-x86_64 -m 512 -vnc :1 -kernel /boot/vmlinuz-3.5.0-45-generic -append "console=tty0 console=ttyS0,115200n8r" -serial stdio
{{{
qemu-system-x86_64: pci_add_option_rom: failed to find romfile "pxe-rtl8139.rom"
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version 3.5.0-45-generic (buildd@toyol) (gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-2ubuntu1) ) #68-Ubuntu SMP Mon Dec 2 21:58:52 UTC 2013 (Ubuntu 3.5.0-45.68-generic 3.5.7.26)
[    0.000000] Command line: console=tty0 console=ttyS0,115200n8r

(smip)
}}}
  * マニュアルには{{{When using the direct Linux boot, a disk image for the first hard disk hda is required because its boot sector is used to launch the Linux kernel.}}}とあるが、少なくともqemu-kvm-1.2.0+noroms-0ubuntu2.12.10.6, Debianでは不要な模様