📄 atbase.asm
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align 4 ;R25
PUBLIC INT_19S
INT_19S PROC NEAR
mov ax,G_RAM
mov ds,ax
assume ds:G_RAM
cli
mov word ptr ds:[Disk_Parm_Ptr], offset cs:FDC_PARS
mov word ptr ds:[Disk_Parm_Ptr+2],cs
sti
;R125 - start
ifdef LAN_BOOT_SUPPORT
;Boot from INT 18H first if user enable in CMOS setup
test byte ptr ds:SYSTEM_FLAG,BOOT_LAN ;boot LAN ?
jz short NoInt18Hooked
;check if INT 18H hooked by other ROMs
cmp word ptr ds:[Int18],offset cs:Int18_Hdlr
jne short YesTryInt18
mov ax,cs ;INT 18 hooked ?
cmp word ptr ds:[Int18+2],ax
je short NoInt18Hooked
YesTryInt18:
int 18H
NoInt18Hooked:
endif; LAN_BOOT_SUPPORT
;R125 - end
;R28 start
;R43ifdef CD_ROM
;R43 push ax
;R43 test byte ptr G_RAM:[CDROM_EMUL_HEAD],0fh
;R43 jz No_CDROM_Bootable
;R43 mov es,ax
;R43 mov al,G_RAM:[CDROM_EMUL_HEAD]
;R43 mov G_RAM:[CDROM_ALLOCATE],al
;R43 mov dword ptr G_RAM:[CDROM_EMUL_START_SECTOR],0
;R43 mov word ptr G_RAM:[CDROM_EMUL_CYL_SEC],0ffffh
;R43 mov byte ptr G_RAM:[CDROM_EMUL_HEAD],16
;R43 inc byte ptr G_RAM:[NumHDSKS]
;R43 mov ax,201h
;R43 mov bx,offset Boot
;R43 mov cx,6
;R43 mov dx,180h
;R43 int 13h
;R43 jc CDROM_Fail
;R43 cmp dword ptr es:[bx+1],'00DC'
;R43 jne CDROM_Fail
;R43 cmp byte ptr es:[bx+5],'1'
;R43 jne CDROM_Fail
;R43 mov eax,es:[bx+47h]
;R43 call Xlat_CDsec_CHS
;R43 mov ax,201h
;R43 mov dl,80h
;R43 int 13h
;R43 jc CDROM_Fail
;R43 mov ax,es:[bx]
;R43 cmp al,1 ;Header ID,must be 1
;R43 jne CDROM_Fail
;R43;--- Platform ID ---
;R43AT_80x86 EQU 0
;R43Power_PC EQU 1
;R43Mac EQU 2
;R43Comp_Platform:
;R43 cmp ah,AT_80x86 ;compare Platform ID
;R43 je short Scan_bootable
;R43@@:
;R43 add bx,20h
;R43 cmp bx,offset Boot + 800h
;R43 jae CDROM_Fail
;R43 mov ax,es:[bx]
;R43Comp_Header:
;R43 cmp al,90h
;R43 je short Comp_Platform
;R43 cmp al,91h
;R43 je short Comp_Platform
;R43 jmp short @B
;R43Scan_bootable:
;R43 add bx,20h
;R43 cmp bx,offset Boot + 800h
;R43 jae CDROM_Fail
;R43 mov ax,es:[bx]
;R43 cmp al,88h ;Is Bootable image?
;R43 jne short Comp_Header ;No,jump
;R43 mov edx,es:[bx+8]
;R43 mov ds:CDROM_EMUL_START_SECTOR,edx
;R43 and ah,0fh
;R43 cmp ah,1
;R43 je short Floppy_120MB
;R43 cmp ah,2
;R43 je short Floppy_144MB
;R43 cmp ah,3
;R43 je short Floppy_288MB
;R43 cmp ah,4 ;Is emulate HD drive?
;R43 je short HDD_Drive
;R43 jmp short CDROM_Fail
;R43Floppy_120MB:
;R43 mov byte ptr ds:[CDROM_EMUL_CYL_SEC],0fh
;R43 jmp short @F
;R43Floppy_144MB:
;R43 mov byte ptr ds:[CDROM_EMUL_CYL_SEC],12h
;R43 jmp short @F
;R43Floppy_288MB:
;R43 mov byte ptr G_RAM:[CDROM_EMUL_CYL_SEC],24h
;R43@@:
;R43 mov byte ptr G_RAM:[CDROM_EMUL_CYL_SEC+1],50h
;R43 sub byte ptr G_RAM:[CDROM_ALLOCATE],4
;R43 mov byte ptr G_RAM:CDROM_EMUL_HEAD,2
;R43 jmp short No_CDROM_Bootable
;R43HDD_Drive:
;R43 mov ax,201h
;R43 mov bx,offset Boot
;R43 mov cx,1
;R43 mov dx,80h
;R43 int 13h
;R43 add bx,1beh
;R43@@:
;R43 cmp word ptr es:[bx],0aa55h
;R43 je short CDROM_Fail
;R43 test byte ptr es:[bx],80h
;R43 jnz short @F
;R43 add bx,10h
;R43 jmp @B
;R43@@:
;R43 mov al,es:[bx+5]
;R43 inc al
;R43 mov ds:CDROM_EMUL_HEAD,al
;R43 mov ax,es:[bx+6]
;R43 mov ds:CDROM_EMUL_CYL_SEC,ax
;R43 jmp short No_CDROM_Bootable
;R43CDROM_Fail:
;R43No_CDROM_Bootable:
;R43 pop ax
;R43endif ;CD_ROM
;R28 end
new_dsk:
mov dx,ax ; (ax is 0)
mov es,ax ; set to load at 0:offset Boot
mov bx,offset Boot
mov cx,1 ; set to read one sector
; mov al,CMOS_AWARD_CK NMI_ON ; get CMOS byte with boot indicator
; call Get_CMOS
; test al,HARD_DISK_FIRST ; check try hard first
;R79 mov si,offset BootSeq_Item
;R79 call GetItem_Cmos
;R79 - start
mov al,ds:[BootSel] ;get boot sequence
;R79 - end
;R28 start
xor ah,ah
mov si,ax
shl si,1 ;si = si*3
add si,ax ;---------
add si,offset Boot_Seq_Drive
;R28 end
;R28 or al,al
;R28 jz short do_boot ; skip if floppy first
;R28 mov dl,80h ; else setup for hard first
;R28 do_boot:
mov dl,cs:[si] ;R28
call try_boot ; try boot load on first device
jnc good_load ; skip if load good
;R28 xor dl,80h ; get to next device
mov dl,cs:[si+1] ;R28
call try_boot ; try boot load on second device
jnc good_load ; skip if load good
;R88;R28 start
;R88ifdef CD_ROM
mov dl,cs:[si+2]
call try_boot
jnc good_load
;R88endif ;CD_ROM
;R88;R28 end
jmp hang ; else skip to handle bad load
align 4 ;R25
try_boot proc near
push si ;R28
cmp dl,None_Drive ;R66
je load_failed ;R66
;R88 start
ifdef HDD_Boot_Selectable
and byte ptr [CDROM_ALLOCATE],not Enable_SCSI_Boot
cmp dl,SCSI_Drive
jne short @F
cmp byte ptr cs:[SCSI_Drive_Max_Num],80h ;SCSI present ? R88A
jbe Load_Failed ;no SCSI drive R88A
or byte ptr [CDROM_ALLOCATE],Enable_SCSI_Boot
mov dl,C_DRIVE
@@:
endif ;HDD_Boot_Selectable
;R88 end
mov si,3 ; setup for three retries
xor di,di ; assume floppy boot try
;R10 or dl,dl ; boot from HDD?
;R10 js short @F ; yes
;R10 mov al,10h NMI_ON ; FDD CMOS value
;R10 call Get_CMOS
;R10 test al,11110000b
;R10 jz short Load_Failed
;R10 @@:
;R115A start
mov al,10h NMI_ON ; FDD CMOS value
call Get_CMOS
ifdef ATAPI_Boot
test al,11110000b
jz short No_FloppyA
or byte ptr [ATAPI_Byte],8
No_FloppyA:
endif ;ATAPI_Boot
;R115A end
or dl,dl ; check hard disk boot
;R28 jns short try_again ; skip if not for floppy
;R28 start
js short @F
;R60 start
;R115A mov al,10h NMI_ON ; FDD CMOS value
;R115A call Get_CMOS
test al,11110000b
jnz short Floppy_Exist
test byte ptr [ATAPI_Byte],4 ;R97
jnz short Floppy_Exist ;R97
cmp word ptr [int13],offset HRDSKIO
jne short Floppy_Exist
cmp word ptr [int40],offset DSK_VECT
je Load_Failed
Floppy_Exist:
;R60 end
;R120 start
ifdef Support_DriveA_Boot_Permit
cmp dl,A_DRIVE
jne short Not_DriveA_Boot
mov al,DriveA_Boot_Permit_CMOS NMI_OFF
call Get_Cmos
test al,DriveA_Boot_Permit_CMOS_Mask
jz Load_Failed
Not_DriveA_Boot:
endif ;Support_DriveA_Boot_Permit
;R120 end
;R115 start
;R115Aifdef LS120_SUPPORT
;R115A cmp dl,A_DRIVE
;R115A jne short Not_FloppyA_boot
;R115A test al,11110000b
;R115A jz short Not_LS120_boot
;R115A or byte ptr [ATAPI_Byte],8
;R115ANot_FloppyA_boot:
ifdef ATAPI_Boot ;R115A
cmp dl,LS120_DRIVE
jne short Not_LS120_boot
and byte ptr [ATAPI_Byte],not 8
mov dl,A_DRIVE
Not_LS120_boot:
;R115Aendif ;LS120_SUPPORT
endif ;ATAPI_Boot ;R115A
;R115 end
ifdef CD_ROM
mov al,G_RAM:[CDROM_ALLOCATE]
and al,0fh
shr al,2
cmp al,1 ;emulate Drive A?
;R43 jne short try_again
jne try_again ;R43
inc dl
endif ;CD_ROM
;R43 jmp short try_again
jmp try_again ;R43
@@:
;R28 end
inc di ; else signal hard boot, (tested by Check_Boot_Record)
;R28 start
ifdef CD_ROM
;R43 cmp dl,80h
;R43 jne short @F
;R43 start
cmp dl,80h
jne Not_from_CDROM
test byte ptr G_RAM:[CDROM_EMUL_HEAD],0fh
jz No_CDROM_Bootable
pusha
push es
push ds
mov ax,G_RAM ;R97
mov es,ax
test byte ptr G_RAM:[CDROM_ALLOCATE],0fh
jnz short @F
mov al,G_RAM:[CDROM_EMUL_HEAD]
;;R123 mov G_RAM:[CDROM_ALLOCATE],al
and al,0fh ;R123
and G_RAM:[CDROM_ALLOCATE],0f0h ;R123
or G_RAM:[CDROM_ALLOCATE],al ;R123
inc byte ptr G_RAM:[NumHDSKS]
@@:
;R52A start
ifndef NO_CDROM_BOOT_MESSAGE ;R78
push ds
push es
mov di,CD_ROM_TEMP_SEG
mov es,di
mov di,27*2 - CD_Boot_Str0_len ;R53
mov cx,CD_Boot_Str0_len ;R53
push cs ;R53
pop ds ;R53
lea si,CD_Boot_Str0 ;R53
rep movsb ;R53
mov bp,27*2 - CD_Boot_Str0_len ;R53
;R68 mov cx,Model_Number_Len ;R53
;R68 add cx,CD_Boot_Str0_len ;R53
mov cx,CD_Boot_Str0_len ;R68
call Display_str ;R53
;R68 mov di,27*2
;R53 push cs
;R53 pop ds
;R68Found_Loop:
;R68 lea si,Special_CDROM_Drive
;R68 mov cx,Special_CDROM_Len0
;R68 rep cmpsb
;R68 jz short Found_It
;R68 cmp di,27*2+Model_Number_Len-Special_CDROM_Len0
;R68 jbe short Found_Loop
;R68Found_It:
pop es
pop ds
endif ;NO_CDROM_BOOT_MESSAGE ;R78
;R68 jnz short @F
;R68 or byte ptr G_RAM:[CDROM_ALLOCATE],Special_CDROM_Bit
@@:
;R52A end
mov dword ptr G_RAM:[CDROM_EMUL_START_SECTOR],0
mov word ptr G_RAM:[CDROM_EMUL_CYL_SEC],0ffffh
;R123C mov byte ptr G_RAM:[CDROM_EMUL_HEAD],16
mov byte ptr G_RAM:[CDROM_EMUL_HEAD],255 ;R123C
;R96 mov cx,800h ;R53
;R97 mov cx,2000h ;R96
;R123A mov cx,0a000h ;R123
;R123A test G_RAM:[CDROM_ALLOCATE],Special_CDROM_Bit ;R123
;R123A jnz @F ;R123
;R123A start
;R123D test G_RAM:[CDROM_ALLOCATE],Special_CDROM_Bit
;R123D jz @F
xor cx,cx
;R123B mov bx,1
;R123D mov bx,5 ;R123B 5*2.5 =12.5 sec
movzx bx,byte ptr DGROUP:[CDROM_Boot_Delay] ;R123D
or bl,bl ;R123D
jz short @F ;R123D
call WAIT_REFRESH
;R123D mov cx,0a000h ;R123B more loop to read boot data
;R123D jmp short Spec_CDROM ;R123B
@@:
;R123A end
;R123D mov cx,800h ;R97
xor cl,cl ;R123D
mov ch,byte ptr DGROUP:[CDROM_Boot_loop] ;R123D
Spec_CDROM: ;R123B
@@: ;R53
push cx ;R53
mov ax,201h
mov bx,offset Boot
mov cx,6
mov dx,180h
;R57 int 13h
pushf ;R57
call far ptr HRDSKIO ;R57
;R53 jc CDROM_Fail
pop cx ;R53
jnc short @F ;R53
cmp ah,32H ;R127
;R127 Media type not supported by drive
je short CDROM_Fail_0 ;R127
loop short @B ;R53
CDROM_Fail_0: ;R127
jmp CDROM_Fail ;R53
@@: ;R53
cmp dword ptr es:[bx+1],'00DC'
jne CDROM_Fail
cmp byte ptr es:[bx+5],'1'
jne CDROM_Fail
mov eax,es:[bx+47h]
call Xlat_CDsec_CHS
;read booting catalog to CD_ROM_TEMP_SEG:CD_ROM_TEMP_OFF
mov bx,CD_ROM_TEMP_SEG
mov es,bx
mov bx,CD_ROM_TEMP_OFF
mov ax,201h
mov dl,80h
;R57 int 13h
pushf ;R57
call far ptr HRDSKIO ;R57
jc CDROM_Fail
cmp byte ptr es:[bx],1 ;Header ID,must be 1
jne CDROM_Fail
;R44A mov di,CD_ROM_TEMP_SEG
;R44A mov es,di
;R44A mov di,200h
;R44A mov dl,G_RAM:[CDROM_ALLOCATE]
;R44A and dl,3
;R44A add dl,80h
;R44A Post_func_call Auto_IDE_Detect
;R53 mov di,27*2 - CD_Boot_Str0_len
;R53 mov cx,CD_Boot_Str0_len
;R53 push cs
;R53 pop ds
;R53 lea si,CD_Boot_Str0
;R53 rep movsb
;R53 add di,Model_Number_Len
;R53 lea si,CD_Boot_Str1
;R53 mov cx,CD_Boot_Str1_len
;R53 rep movsb
;R53
;R53 mov bp,27*2 - CD_Boot_Str0_len
;R53 mov cx,Model_Number_Len
;R53 add cx,CD_Boot_Str0_len
;R53 add cx,CD_Boot_Str1_len
;R53 call Display_str
ifndef NO_CDROM_BOOT_MESSAGE ;R78
push es ;R53
push cs ;R53
pop es ;R53
lea bp,CD_Boot_Str1 ;R53
mov cx,CD_Boot_Str1_len ;R53
call Display_str ;R53
pop es ;R53
endif ;NO_CDROM_BOOT_MESSAGE ;R78
mov bx,CD_ROM_TEMP_SEG
mov es,bx
mov bx,CD_ROM_TEMP_OFF
mov di,TEMP_OFF
mov dword ptr es:[di+0b0h],'.0 '
mov dword ptr es:[di+0b4h],' DH '
mov ah,es:[bx+1]
;--- Platform ID ---
AT_80x86 EQU 0
Power_PC EQU 1
Mac EQU 2
Comp_Platform:
cmp ah,AT_80x86 ;compare Platform ID
je short Scan_bootable
@@:
add bx,20h
cmp bx,CD_ROM_TEMP_OFF + 800h
jae Scan_over
mov ax,es:[bx]
Comp_Header:
cmp al,90h
je short Comp_Platform
cmp al,91h
je short Comp_Platform
jmp short @B
Scan_bootable:
add bx,20h
cmp bx,CD_ROM_TEMP_OFF + 800h⌨️ 快捷键说明
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