✎ soc:2008:dverkamp:journal:start

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====== Daniel Verkamp: COMBOOT Support ======

===== Journal =====

==== Week 0 ====
----

=== 19 May 2008 ===

Journal created. 

=== 21 May 2008 ===

  * Image type detection by filename: check image->uri?
  * arch/i386/README.i386: use libpm for COM32 transitions, librm for 16-bit COMBOOT
  * hook_bios_interrupt -> hook the COMBOOT API ints (for 16-bit) with stubs that call back into gPXE?
  * REAL_CODE, PHYS_CODE in inline asm
  * memcpy_user, real_to_user
  * i386_all_regs, regs_t (ordered like PUSHA) types
  * _virt_to_phys to switch from etherboot-style virtual address space to flat physical addresses (COM32)
  * basemem_packet (BASEMEM_PACKET_LEN = 1514)
  * arch/i386/include/virtaddr.h: VIRTUAL/PHYSICAL/REAL_CS/DS
  * install_rm_callback_interface
  * Split COMBOOT and C32 or use the same image type for both?

== TODO ==

  * Check current PXE API support
  * Find out how to add config option for image type

=== 23 May 2008 ===

  * Had meeting with mdc and mcb30; discussed basic architecture for COMBOOT support
  * Discovered how near RET from 16-bit COMBOOT works - INT 20h at byte 0 of segment (documented as part of PSP in COMBOOT spec)
  * Sample hook_bios_interrupt/call_prot code from mcb30; see [[soc/2008/dverkamp/notes/hook_bios_interrupt]]
  * Finished basic 16-bit COMBOOT loading and INT 20h and INT 21h AH=02h hooks {{:soc:2008:dverkamp:journal:dverkamp-may-23-2008.png|}}

=== 24 May 2008 ===

  * Figured out and fixed why RET wasn't working - top of stack wasn't being cleared
  * Cleaned up and committed beginnings of COMBOOT API

==== Week 1 ====
----

=== 25-26 May 2008 ===

  * Allow COMBOOT images to return via INT 20h - save the (far) return address during exec, then save the old stack address in the PSP, so in INT 20h handler, just change back to old stack and do RETF
  * Handle other termination API functions (INT 21h, AH=00h and AH=4Ch) - call INT 20h handler
  * Handle INT 21h, AH=09h (Write DOS String to Console) and AH=30h (Check DOS Version)

=== 29 May 2008 ===

  * Add beginning of SYSLINUX AX=0001h (get version) and AX=0003h (run command)
  * Run command function was looping on itself (comboot executable ran again when "boot" executed?), so did similar "unregister image while running" like image/script.c

=== 30 May 2008 ===

  * Meeting with mdc
==== Week 2 ====
----

=== 02 June 2008 ===

  * Message to soc-mentors discussing implementation details; learned how to get available memory, test if key is hit, call protected-mode code with flat-memory setup, etc.
  * Finish COMBOOT API "Get Version" - return address of version and copyright strings [[ http://git.etherboot.org/?p=people/dverkamp/gpxe.git;a=commitdiff;h=4f02100d29583bd9586e4a832eb910f9192d304b | 4f02100d29583bd9586e4a832eb910f9192d304b ]]
  * Fill in correct value for available memory field in PSP header [[ http://git.etherboot.org/?p=people/dverkamp/gpxe.git;a=commit;h=c07e41f20e6ef9b89e290733d5c06a8fcadfb0e1 | c07e41f20e6ef9b89e290733d5c06a8fcadfb0e1 ]]

=== 03 June 2008 ===

  * Initial try at COM32 support; helper functions are not implemented yet, so nothing really works [[ http://git.etherboot.org/?p=people/dverkamp/gpxe.git;a=commitdiff;h=6d18cc20c85e7a1a195705d1da6bd67c0917138f | 6d18cc20c85e7a1a195705d1da6bd67c0917138f ]]
  * Wrappers for COM32 helper functions to switch between flat mapping used by COM32 and the virtual address space used by gPXE (COM32 still mainly untested) [[ http://git.etherboot.org/?p=people/dverkamp/gpxe.git;a=commitdiff;h=d5e92f83c8fba51e0a2c803b9204bae7d86c9cd8 | d5e92f83c8fba51e0a2c803b9204bae7d86c9cd8 ]]
  * Some small fixes to COMBOOT (always load the image in the same place, and use that fact to locate the PSP even if the image changes segment registers) [[ http://git.etherboot.org/?p=people/dverkamp/gpxe.git;a=commitdiff;h=245547103ed490bfc380d94ea7f7634a6e46f11a | 245547103ed490bfc380d94ea7f7634a6e46f11a ]]

TODO:
  * Find correct end of available memory value for ESP before executing COM32 images
  * Finish helper functions (copy between registers and com32sys_t structs)

=== 04 June 2008 ===

   * Find end of memory value from walking memmap and pass it to COM32 programs [[ http://git.etherboot.org/?p=people/dverkamp/gpxe.git;a=commitdiff;h=164672592936bb3026b4ada3113b3e66f0e6f51c || 164672592936bb3026b4ada3113b3e66f0e6f51c ]]

=== 05 June 2008 ===

   * Fix a lot of small things related to COM32; now ''hello.c32'' and ''hello2.c32'' run correctly!

[[ http://git.etherboot.org/?p=people/dverkamp/gpxe.git;a=commitdiff;h=3876fad11e9f4ba3d8319eaadffce7c30aaaeaa6 || 3876fad11e9f4ba3d8319eaadffce7c30aaaeaa6 ]], [[ http://git.etherboot.org/?p=people/dverkamp/gpxe.git;a=commitdiff;h=bcb1ffca2899973f73381d36cdae88e7c13c0881 || bcb1ffca2899973f73381d36cdae88e7c13c0881 ]], [[ http://git.etherboot.org/?p=people/dverkamp/gpxe.git;a=commitdiff;h=32030bd5f16208b01441eed8ef0d101362770ef0 || 32030bd5f16208b01441eed8ef0d101362770ef0 ]], [[ http://git.etherboot.org/?p=people/dverkamp/gpxe.git;a=commitdiff;h=8f4adae9cb357b8f88beea16439fa2afdcc127d3 || 8f4adae9cb357b8f88beea16439fa2afdcc127d3 ]], [[ http://git.etherboot.org/?p=people/dverkamp/gpxe.git;a=commitdiff;h=f7a3b956e3eaa5689da98721d1bbb55910b5d6c1 || f7a3b956e3eaa5689da98721d1bbb55910b5d6c1 ]]

{{:soc:2008:dverkamp:journal:jun-05-2008.png|}}

  * Only the intcall helper is implemented; the farcall and cfarcall helper functions are still unimplemented, but should be relatively easy now that intcall is working

==== Week 3 ====
----

=== 10 June 2008 ===
  * Implement file I/O functions (open, read, close) based on gPXE's posix_io support [[ http://git.etherboot.org/?p=people/dverkamp/gpxe.git;a=commitdiff;h=dcf8448c1e922892ee8dc4cf7a238eaebca1a5df || dcf8448c1e922892ee8dc4cf7a238eaebca1a5df ]]
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