From: nowhere@never.at   
      
   On 27/11/2023 16:31, James Harris wrote:   
      
   > For boot manager see section 3.   
   OK.   
   > Status codes such as we might receive or we might pass back to EFI are   
   > documented in appendix D.   
   OK.   
   ...   
   >> Yes, I'm not enough familiar with NASM so it may take me a few hours   
   >> to learn that too, or just get a clue of what all must be in the   
   >> UEFI.bin.   
      
   >> UEFI comes with C-libraries ?   
   >> I'd delete them immediate :)   
      
   > I agree. The reloc library code is not wanted.   
      
   > That said, AISI I don't need it at present because my own code is   
   > position-independent but if I ever need to have non-PIC code then some   
   > form of PE-reloc code would be necessary.   
      
   My code was/is always position independent w/o self-relocation needs   
   because I know what goes where by using my brain instead of guessing   
   what assembler/compiler might do.   
   So I use immediate constants rather than dynamic RIP addressing.   
      
   >>> Does the disassembly answer your remaining questions?   
   >> it may make me raise more questions later :)   
   > :-)   
   Questions may come soon :)   
      
   =========================================   
   >>>>> struc efi_systab ;UEFI system table   
   >>>>>    .hdr:      resb efi_hdr_size   
   >>>>>    .fvend:    resq 1 ;FirmwareVendor   
   >>>>>    .frev:     resd 1 ;FirmwareRevision   
   >>>>>               resd 1 ;padding   
   >>>>>    .coninh:   resq 1 ;ConsoleInHandle   
   >>>>>    .conin:    resq 1 ;ConIn   
   >>>>>    .conouth:  resq 1 ;ConsoleOutHandle   
   >>>>>    .conout:   resq 1 ;ConOut   
   >>>>> endstruc   
   >>   
   >>>>> The header is   
   >>>>   
   >>>>> struc efi_hdr ;Generic header   
   >>>>>    .Signature:    resq 1   
   >>>>>    .Revision:     resd 1   
   >>>>>    .HeaderSize:   resd 1   
   >>>>>    .CRC32:        resd 1   
   >>>>>                   resd 1  ;reserved   
   >>>>> endstruc   
   >>   
   >> I try to convert the above: (pointed to by RDX)   
   >> efi_systab:   
   >> 000 dq ptr to efi_header   
   >> 008 dq STR16ptr to FirmwareVendor  ;UTF16   
   >> 010 d  FirmwareRevision   
   >> 014 d  0000_0000   
   >> 018 dq handle for ConsoleIN   
   >> 020 dq ptr tp ConsoleIN   
   >> 028 dq handle for ConsoleOut   
   >> 030 dq ptr to ConsoleOUT   
   >> ----------------------------   
   >> efi_header:   
   >> 000 dq Signature   
   >> 008 dq Revision   
   >> 010 q  Headersize (in bytes) wouldn't it just say 0000001c ?   
   >> 014 q  CRC32                 ;of what ???   
   >> 018 q reserved ....   
   =======================   
      
   > If the 3-digit numbers are offsets then not quite. If the header is 24   
   > bytes then when struc efi_systab specifies   
   >   
   >    .hdr:      resb efi_hdr_size   
   >   
   > it is reserving 24 bytes at the start of the system table.   
      
   I don't get that at all.   
     would you mind to correct my above translation in my format ?   
   ...   
   > Feel free to correct me if I've got something wrong or mention anything   
   > you find out. This is a learning experience for me, too!   
      
   sing along: two blind mice... :)   
   coz my eyes became worse I need to zoom everything to 200%.   
   __   
   wolfgang   
      
   --- SoupGate-Win32 v1.05   
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