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https://gitlab.com/bztsrc/bootboot.git
synced 2023-02-13 20:54:32 -05:00
Added Linux boot protocol too
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bzt
parent
3601735396
commit
02376d2074
5 changed files with 67 additions and 13 deletions
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@ -7,7 +7,7 @@ I provide pre-compiled images ready for use.
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Standard GNU toolchain and a few files from gnuefi (included).
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[bootboot.efi](https://gitlab.com/bztsrc/bootboot/raw/master/bootboot.efi) (93k), [bootboot.rom](https://gitlab.com/bztsrc/bootboot/raw/master/bootboot.rom) (93k)
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2. *x86_64-bios* BIOS, Multiboot (GRUB) and El Torito (CDROM) compatible, OBSOLETE loader.
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2. *x86_64-bios* BIOS, Multiboot (GRUB), El Torito (CDROM), Expansion ROM and Linux boot compatible, OBSOLETE loader.
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If you want to recompile this, you'll need fasm (not included).
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[boot.bin](https://gitlab.com/bztsrc/bootboot/raw/master/boot.bin) (512 bytes, works as MBR, VBR and CDROM boot record too), [bootboot.bin](https://gitlab.com/bztsrc/bootboot/raw/master/bootboot.bin) (10k, loaded by boot.bin, also BBS Expansion ROM and Multiboot compliant)
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BIN
bootboot.bin
BIN
bootboot.bin
Binary file not shown.
Binary file not shown.
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@ -1,12 +1,13 @@
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BOOTBOOT BIOS / Multiboot Implementation
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========================================
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BOOTBOOT BIOS / Multiboot / El Torito / Expansion ROM / Linux boot Implementation
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=================================================================================
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See [BOOTBOOT Protocol](https://gitlab.com/bztsrc/bootboot) for common details.
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On [BIOS](http://www.scs.stanford.edu/05au-cs240c/lab/specsbbs101.pdf) based systems, the same image can be loaded via
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[Multiboot](https://www.gnu.org/software/grub/manual/multiboot/multiboot.html),
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chainload from MBR, VBR (GPT hybrid booting) or from CDROM boot record via __boot.bin__, or run as a BIOS Expansion ROM
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(so not only the ramdisk can be in ROM, but the loader as well).
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chainload from MBR, VBR (GPT hybrid booting) or from CDROM boot record via __boot.bin__, run as a BIOS Expansion ROM
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(so not only the ramdisk can be in ROM, but the loader as well), or can be loaded as a
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[Linux kernel](https://elixir.bootlin.com/linux/latest/source/Documentation/x86/boot.txt) (by ISOLINUX, LoadLin etc.).
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Machine state
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-------------
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@ -163,6 +163,8 @@ end virtual
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; 26 2 pnp ptr, must be zero
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; 28 4 flags, must be zero
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; 32 32 MultiBoot header with protected mode entry point
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; 64 x free to use
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;497 127 Linux x86 boot protocol header
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;any format can follow.
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USE16
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@ -301,18 +303,19 @@ realmode_start:
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popf
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cmp dx, bx
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jne .cpuerror
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mov ebp, 200000h
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;check for 386
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;look for cpuid instruction
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pushfd
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pop eax
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mov ebx, eax
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xor eax, 200000h
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and ebx, 200000h
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xor eax, ebp
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and ebx, ebp
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push eax
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popfd
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pushfd
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pop eax
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and eax, 200000h
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and eax, ebp
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xor eax, ebx
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shr eax, 21
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and al, 1
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@ -335,12 +338,14 @@ realmode_start:
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jnc .cpuerror
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;and can we use long mode (LME)?
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mov eax, 80000000h
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mov ebp, eax
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inc ebp
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push bx
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cpuid
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pop bx
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cmp eax, 80000001h
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cmp eax, ebp
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jb .cpuerror
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mov eax, 80000001h
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mov eax, ebp
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cpuid
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;long mode
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bt edx, 29
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@ -356,7 +361,7 @@ realmode_start:
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stc
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mov ax, 2401h ;BIOS enable A20 function
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int 15h
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jnc .a20ok
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jnc a20ok
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;keyboard nightmare
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call .a20wait
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mov al, 0ADh
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@ -377,7 +382,7 @@ realmode_start:
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call .a20wait
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mov al, 0AEh
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out 64h, al
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jmp .a20ok
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jmp a20ok
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;all methods failed, report an error
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mov si, a20err
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@ -391,7 +396,55 @@ realmode_start:
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test al, 1
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jz .a20wait2
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ret
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.a20ok:
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;--- Linux x86 boot protocol header ---
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db 01F1h-($-$$) dup 090h
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hdr:
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setup_sects: db (loader_end-loader)/512
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root_flags: dw 0
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syssize: dd (loader_end-loader)/16
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ram_size: dw 0
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vid_mode: dw 0
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root_dev: dw 0
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boot_flag: dw 0AA55h
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db 0EBh ; short jmp
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db start_of_setup-@f ; no space to jump to realmode_start directly
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@@: db "HdrS"
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dw 020eh
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realmode_swtch: dd 0
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start_sys_seg: dw 0
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dw starting-512 ; we don't have Linux kernel version...
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type_of_loader: db 0
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loadflags: db 0
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setup_move_size: dw 08000h
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code32_start: dd 100000h ; we dont' use this either...
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ramdisk_image: dd 0
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ramdisk_size: dd 0
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bootsect_kludge: dd 0
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heap_end_ptr: dd loader_end+1024-512 ; we don't care, we set our stack directly
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ext_loader_ver: db 0
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ext_loader_type: db 0
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cmd_line_ptr: dd 0
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initrd_addr_max: dd 07fffffffh
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kernel_alignment: dd 16
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relocatable_kernel: db 0
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min_alignment: db 4
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xloadflags: dw 0
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cmdline_size: dd 0
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hardware_subarch: dd 0
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hardware_subarch_data: dq 0
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payload_offset: dd 0
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payload_length: dd 0
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setup_data: dq 0
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pref_address: dq 7C00h
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init_size: dd 0
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handover_offset: dd 0
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acpi_rsdp_addr: dq 0
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start_of_setup:
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jmp realmode_start
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; --- end of Linux boot protocol header ---
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a20ok:
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; wait for a key press, if so use backup initrd
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mov ecx, dword [046Ch]
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add ecx, 10 ; ~500ms, 18.2/2
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