Table of Contents
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 hook_bios_interrupt
- Finished basic 16-bit COMBOOT loading and INT 20h and INT 21h AH=02h hooks
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
