kotovalexarian-likes-gitlab/bztsrc--bootboot
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Dynamically query CDROM drive on BIOS

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bzt 2021-01-21 18:24:03 +01:00
parent 934b90f2f9
commit 7c6a8ee72e
10 changed files with 60 additions and 35 deletions
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4
OLVASSEL.md
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@ -354,13 +354,13 @@ Hibakeresés
----------- -----------
``` ```
BOOTBOOT-PANIC: LBA support not found BOOTBOOT-PANIC: no LBA support
``` ```
Nagyon régi hardver. A BIOSod nem támogatja az LBA-t. Ezt az üzenetet az első betöltő szektor (boot.bin) írja ki. Nagyon régi hardver. A BIOSod nem támogatja az LBA-t. Ezt az üzenetet az első betöltő szektor (boot.bin) írja ki.
``` ```
BOOTBOOT-PANIC: FS0:\BOOTBOOT.BIN not found BOOTBOOT-PANIC: no FS0:\BOOTBOOT.BIN
``` ```
A fő betöltő nem található a lemezen, vagy az induló szektorcíme nincs jól rögzítve az indítószektor 32 bites A fő betöltő nem található a lemezen, vagy az induló szektorcíme nincs jól rögzítve az indítószektor 32 bites

4
README.md
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@ -355,13 +355,13 @@ Troubleshooting
--------------- ---------------
``` ```
BOOTBOOT-PANIC: LBA support not found BOOTBOOT-PANIC: no LBA support
``` ```
Really old hardware. Your BIOS does not support LBA. This message is generated by 1st stage loader (boot.bin). Really old hardware. Your BIOS does not support LBA. This message is generated by 1st stage loader (boot.bin).
``` ```
BOOTBOOT-PANIC: FS0:\BOOTBOOT.BIN not found BOOTBOOT-PANIC: no FS0:\BOOTBOOT.BIN
``` ```
The loader is not on the disk or it's starting LBA address is not recorded in the boot sector at dword [0x1B0] The loader is not on the disk or it's starting LBA address is not recorded in the boot sector at dword [0x1B0]

BIN
bootboot_spec_1_kiad.pdf
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bootboot_spec_1st_ed.pdf
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BIN
dist/boot.bin vendored
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dist/bootboot.bin vendored
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8
mkbootimg/data.c
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2
mkbootimg/data.h
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@ -3,7 +3,7 @@
extern unsigned char binary_boot_bin[512]; extern unsigned char binary_boot_bin[512];
extern unsigned char binary_bootboot_bin[12288]; extern unsigned char binary_bootboot_bin[12288];
extern unsigned char binary_bootboot_efi[101490]; extern unsigned char binary_bootboot_efi[101490];
extern unsigned char binary_bootboot_img[34712]; extern unsigned char binary_bootboot_img[35032];
extern unsigned char binary_bootboot_rv64[8192]; extern unsigned char binary_bootboot_rv64[8192];
extern unsigned char binary_LICENCE_broadcom[1594]; extern unsigned char binary_LICENCE_broadcom[1594];
extern unsigned char binary_bootcode_bin[52456]; extern unsigned char binary_bootcode_bin[52456];

59
x86_64-bios/boot.asm
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@ -111,7 +111,6 @@ bootboot_record:
jl .nolba jl .nolba
.notfloppy: mov ah, byte 41h .notfloppy: mov ah, byte 41h
mov bx, word 55AAh mov bx, word 55AAh
clc
int 13h int 13h
jc .nolba jc .nolba
cmp bx, word 0AA55h cmp bx, word 0AA55h
@ -120,25 +119,41 @@ bootboot_record:
jnz .lbaok jnz .lbaok
.nolba: mov si, lbanotf .nolba: mov si, lbanotf
jmp diefunc jmp diefunc
.lbaok: ;try to load stage2 - it's a continous area on disk .lbaok: ;get CDROM drive code
mov ax, word 4B01h
mov si, lba_packet
mov byte [si + 2], 0E0h
push si
int 13h
pop si
jc .read2stg
mov al, byte [si + 2]
mov byte [cdrom], al
;try to load stage2 - it's a continous area on disk
;started at given sector with maximum size of 7000h bytes ;started at given sector with maximum size of 7000h bytes
mov di, lba_packet .read2stg: mov di, lba_packet
mov cx, 8
xor ax, ax
repnz stosw
mov si, stage2_addr mov si, stage2_addr
mov di, lbapacket.sect0
;set up for hard-drive ;set up for hard-drive
movsw xor ah, ah
movsw mov al, 16 ; size
mov byte [lbapacket.size], 16 stosw
mov byte [lbapacket.addr0+1], 08h ;to address 800h mov al, 56 ; count
mov byte [lbapacket.count], 56 stosw
xor al, al
mov ah, 8 ; addr0 to address 800h
stosw
xor ax, ax ; addr1
stosw
movsw ; sect0
movsw ; sect1
xor ax, ax
stosw ; sect2
stosw ; sect3
mov dl, byte [drive] mov dl, byte [drive]
;if it's a CDROM with 2048 byte sectors ;if it's a CDROM with 2048 byte sectors
cmp dl, 0E0h cmp dl, byte [cdrom]
jl @f jl @f
sub di, 4 sub di, 8
;lba=lba/4 ;lba=lba/4
clc clc
rcr word [di+2], 1 rcr word [di+2], 1
@ -146,6 +161,7 @@ bootboot_record:
clc clc
rcr word [di+2], 1 rcr word [di+2], 1
rcr word [di], 1 rcr word [di], 1
;count=count/4
shr word [lbapacket.count], 2 shr word [lbapacket.count], 2
;load sectors ;load sectors
@@: mov ah, byte 42h @@: mov ah, byte 42h
@ -172,7 +188,7 @@ bootboot_record:
@@: mov byte [drive], al @@: mov byte [drive], al
inc byte [cnt] inc byte [cnt]
cmp byte [cnt], 8 cmp byte [cnt], 8
jl .lbaok jl .read2stg
.nostage2err: .nostage2err:
mov si, stage2notf mov si, stage2notf
;fall into the diefunc code ;fall into the diefunc code
@ -184,8 +200,6 @@ bootboot_record:
diefunc: diefunc:
print panic print panic
call printfunc call printfunc
mov si, found
call printfunc
sti sti
xor ax, ax xor ax, ax
int 16h int 16h
@ -208,17 +222,18 @@ printfunc:
;* data area * ;* data area *
;********************************************************************* ;*********************************************************************
panic: db "BOOTBOOT-PANIC: ",0 panic: db "BOOTBOOT-PANIC: no ",0
lbanotf: db "LBA support",0 lbanotf: db "LBA support",0
stage2notf: db "FS0:\BOOTBOOT.BIN",0 stage2notf: db "FS0:\BOOTBOOT.BIN",0
found: db " not found",0
cnt: db 0
drive: db 0
db 01B0h-($-$$) dup 0 db 01B0h-($-$$) dup 0
;right before the partition table some data ;right before the partition table some data
stage2_addr:dd 0FFFFFFFFh,0 ;1B0h 2nd stage loader address stage2_addr:dd 0FFFFFFFFh ;1B0h 2nd stage loader address
;this should be set by mkfs ;this should be set by mkfs
cnt: db 0
drive: db 0
cdrom: db 0
db 0
diskid: dd 0 ;1B8h WinNT expects it here diskid: dd 0 ;1B8h WinNT expects it here
dw 0 dw 0

16
x86_64-bios/bootboot.asm
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@ -284,7 +284,17 @@ realmode_start:
jnz @f jnz @f
.clrdl: mov dl, 80h .clrdl: mov dl, 80h
@@: mov byte [bootdev], dl @@: mov byte [bootdev], dl
;get CDROM drive code
mov ax, word 4B01h
mov si, entrypoint ; bss area
mov byte [si + 2], 0E0h
push si
int 13h
pop si
jc @f
mov al, byte [si + 2]
mov byte [cdromdev], al
@@:
;-----initialize serial port COM1,115200,8N1------ ;-----initialize serial port COM1,115200,8N1------
mov ax, 0401h mov ax, 0401h
xor bx, bx xor bx, bx
@ -948,8 +958,7 @@ prot_readsectorfunc:
.again: mov ax, word [lbapacket.count] .again: mov ax, word [lbapacket.count]
mov word [origcount], ax mov word [origcount], ax
mov dl, byte [readdev] mov dl, byte [readdev]
;don't use INT 13h / AX=4B01h, that's buggy on many BIOSes cmp dl, byte [cdromdev]
cmp dl, 0E0h
jl @f jl @f
;use 2048 byte sectors instead of 512 if it's a cdrom ;use 2048 byte sectors instead of 512 if it's a cdrom
mov al, byte [lbapacket.sect0] mov al, byte [lbapacket.sect0]
@ -2697,6 +2706,7 @@ root_sec: dd 0 ;root directory's first sector
data_sec: dd 0 ;first data sector data_sec: dd 0 ;first data sector
clu_sec: dd 0 ;sector per cluster clu_sec: dd 0 ;sector per cluster
origcount: dw 0 origcount: dw 0
cdromdev: db 0
bootdev: db 0 bootdev: db 0
readdev: db 0 readdev: db 0
cntdev: db 0 cntdev: db 0