Daniel Verkamp: COMBOOT Support

Journal created.

• 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?

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

• 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

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