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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)


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