Update to 2.6

* It seems that NetBSD/i386 and amd64 do not boot on this version of bochs...

Changelog:
Changes in 2.6 (September 2, 2012):

Brief summary :
- More than 10% CPU emulation speedup !
- Support for AMD's SVM hardware emulation (including extended XAPIC support).
- Implemented support for new x86 ISA extensions.
  Bochs is fully aligned with rev043 of Intel(R) Architecture Manual.
- Improved emulation accuracy (critical fixes for APIC, VMX and AVX/XOP emulation).
- Bochs internal debugger: new command to show state of a device from the debugger.
- ROM BIOS: improved PCI boot ROM support (for VGA and other devices)
- Networking:
    - Ported Intel(R) 82540EM Gigabit Ethernet adapter emulation from Qemu.
    - Added PCI network boot ROM support to all network adapters.
    - Added TFTP support to the 'slirp' networking module.
- Harddrive: added support for VirtualPC disk images, fixed sparse disk images.
- Sound:
    - implemented PC speaker beep using the lowlevel sound interface.
    - SDL audio output support.
- Added ability to set log action per device from .bochsrc.
- Moved disk imaging, networking, sound and USB devices to subdirectories
  in the iodev folder.

Detailed change log :

- CPU
  - Implemented EPT A/D extensions support.
    Bochs is fully aligned with rev043 of the of Intel(R) Architecture Manual.
  - Implemented ADX (ADCX/ADOX) instructions support, the feature can
    be enabled using .bochsrc CPUID option.
  - More than 10% CPU emulation speedup with even more optimal lazy flags
    handling, stack access optimizations and cross branch trace linking.
  - Support for AMD's SVM hardware emulation in Bochs CPU, to enable
    configure with --enable-svm option
  - Implemented AMD Extended XAPIC support, to enable set .bochsrc CPU
    APIC option to 'xapic_ext'
  ! Added Corei5 750 (Lynnfield) configuration to the CPUDB
  ! Added Turion64 (Tyler) configuration to the CPUDB
  ! Added AMD Phenom X3 8650 (Toliman) configuration to the CPUDB
  ! Added Corei7 3770K (Ivy Bridge) configuration to the CPUDB
  - Bugfixes for CPU emulation correctness and stability
    (critical fixes for APIC/X2APIC, VMX and AVX/XOP emulation)

- Bochs Debugger and Instrumentation
  - Implemented new debugger command 'info device [string]' that shows the
    state of the device specified in 'string'
  - Improved debug dump for ne2k, pci, pic and vga/cirrus devices. Added
    debug dump for pci2isa, i/o apic, cmos, pit, floppy and dma devices.
  - Added TLB to CPU param tree - now it can be browsed from Bochs internal
    debugger and Bochs debugger GUI through param tree interfaces
  - Implemented 'writemem' debugger command to dump virtual memory block
    starting from selected linear address into a file
  - Updated definition of instrumentation callbacks, see description in
    instrumentation.txt / Fixed instrumentation examples

- Configure and compile
  - Moved disk imaging, networking, sound and USB devices to subdirectories
    in the iodev folder.
  - pcidev: enable support for Linux kernel 3.x (Debian patch by Guillem Jover)
  - debugger: generate parser / lexer files only if all required tools are present

- Config interface
  - Added support for direct device plugin loading with bochsrc directive for
    devices which have the same name for the plugin and config option.
  - The bochsrc option 'plugin_ctrl' can now be used to load/unload optional
    plugins directly when parsing the config file or command line. See the bochsrc
    sample for supported devices.
  - Moved bochsrc parsing / writing and config parameter handling for networking,
    sound and USB devices to the plugin device code. The options are only
    available when the corresponding plugin device is loaded.
  - Added ability to set log action per device from .bochsrc.
  - Added new command line option '-noconsole' to disable the console
    window on Windows host.
  - Renamed PCI Pseudo NIC option to "pcipnic" (for direct plugin loading)
  - Moved several related options to the new "keyboard" bochsrc option.
  - Added new parameter 'rtc_sync' for the 'clock' option. If this option
    is enabled together with the realtime synchronization, the RTC runs
    at realtime speed.
  - Moved MWAIT_IS_NOP bochsrc option from CPUID to CPU so it can be set
    even if cpu was configured using pre-defined CPUDB profile.
  - Allow larger CPU 'quantum' values when emulating SMP systems for speed
    (quantum values up to 32 are allowed now).

- I/O Devices
  - Networking
    - Ported Intel(R) 82540EM Gigabit Ethernet adapter emulation from Qemu,
      to enable configure with option --enable-e1000
    - Added PCI network boot ROM support to all network adapters
    - Added TFTP support to the 'slirp' networking module
  - PCI
    - added "auto-assign to PCI slot" feature for PCI-only devices
  - DMA
    - Added the capability to transfer more then one byte / word per ISA DMA cycle
  - VGA
    - Major rewrite of the vga / cirrus code:
      - vgacore (shared standard VGA emulation code)
      - vga (Bochs VBE and PCI VGA)
      - cirrus (CL-GD 5430 ISA / CL-GD 5446 PCI)
    - Added VGA graphics blinking support
    - More accurate vertical and horizontal retrace emulation
      (based on the DOSBox implementation)
  - hard drive / hdimage
    - added new disk image mode 'vpc' for VirtualPC images
    - undoable mode: added coherency check (flat image size and timestamp)
    - sparse mode: fixed read support
  - Sound
    - implemented PC speaker beep using the lowlevel sound interface
    - added SDL audio output support

- ROM BIOS
  - improved PCI boot ROM support (for VGA and other devices)
  - added MADT entry for Interrupt Source Override to ACPI tables

- GUI and display libraries
  - implemented "auto-off" timer for status LEDs indicating a data transfer
  - Added support for sending absolute mouse position values from the gui if an
    absolute pointing device (USB tablet) is active (rfb, sdl, win32, wx, x).
  - Gui debugger now supported when using sdl gui on Windows
  - Implemented "hideIPS" option in rfb, sdl, win32 and wx libraries
  - wx: fixed random freezes with wxGTK and "show ips" feature enabled
  - rfb: the "show ips" feature now works on Windows host

- Tools
  - bxcommit: added support for converting growing to flat mode images
  - bxcommit: support command line options and non-interactive (quiet) mode
  - bximage: increased maximum disk size to 8 TB

- SF patches applied
  [3540389] Patch 5 : Change memory reference functions argument order by Yeong-uk Jo
  [3539254] Patch 4 : Memory reference optimization 2 by Yeong-uk Jo
  [3539251] Patch 3 : Memory reference optimization by Yeong-uk Jo
  [3539237] Patch 2 : Some optimization by Yeong-uk Jo
  [3539228] Patch 1 : ROM BIOS Compatibility patch by Yeong-uk Jo
  [3505209] Fixed combo box size by Konrad Grochowski
  [2864391] Gui debugger default regs by Thomas Nilsen
  [3486555] Fix critical stack leak in Win32 GUI by Carlo Bramini

- these S.F. bugs were closed/fixed
  [625877]  wx: power button -> thread deadlock
  [3534063] Configure does not check for flex presence
  [3555237] NE2000 doesn't compile on OS/X
  [3553168] X doesn't build in latest code on OS/X
  [3550175] Crash when saving snapshot to directory instead of file
  [3548109] VMX State Not Restored After Entering SMM on 32-bit Systems
  [3548108] VMEXIT Instruction Length Not Always Getting Updated
  [3545941] Typo in preprocessor symbol
  [3538731] Missing CR8 register
  [3538574] Missing XD flag ( Execute Disable ) when showing PTEs
  [3537556] Missing initializations
  [3537309] Unable to use the debug GUI with SDL and plugins
  [3537473] GUI debugger only shows 32-bit CRx registers in x86-64 mode
  [3533426] UHCI PCI interrupts
  [3459359] svga cirrus initialization
  [3535228] info gdt does not show long mode segments
  [3531806] Bochs crashes (SIGSEGV) when starting via ssh console
  [3531807] Various missing initialization values reported by Valgrind
   [635789] mapping mode 0 not supported
  [3307201] BOCHS panics when execute HBIOS.COM
  [3528809] IO APIC index register width
  [3528516] Missing #if in soundmod.h
  [3526069] MADT:Interrupt Source Override missed
  [3518753] update dump after manual chages to memory contents
  [3516859] bug in svn e1000 module
  [3516029] stepping not working in debugger GUI in case of smp vm
  [3510403] closing config dialog box closes entire simulator
  [3459998] Bochs cannot be compiled outside the source tree
  [2905969] can't use --enable-gdb-stub on vs2008
  [3294001] Bochs GUI doesn't appear properly for 2nd Bochs copy
  [3493315] Changing VGA 9/8 dot mode causes screen corruption

- these S.F. feature requests were closed/implemented
  [3540441] automatically enable devices in plugin control
  [1251456] command line method to query bochs for features
  [3409396] sdl sound
  [3519794] debugger's ability to save physical/linear memory dumps
  [1429612] Idea how to speedup simulation - stack direct access
  [1703452] Other Network Devices?
  [2919376] Disable show the console window
   [534271] can't set log action by device (bochsrc)

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