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221 lines
5.6 KiB
NASM
221 lines
5.6 KiB
NASM
comment *
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SERTYPE.ASM
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Purpose:
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Determines the type of UART in each serial port
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*
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dosseg
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bdseg segment at 40h ;bios data segment
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com1 dw ?
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com2 dw ?
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com3 dw ?
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com4 dw ?
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ends
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_data segment para 'data'
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uart1 db 0
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uart2 db 0
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uart3 db 0
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uart4 db 0
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portmsg db "COMx: $"
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x8250 db "NS 8250 (non-FIFO)",13,10,"$"
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x16450 db "NS 8250A/16450/16550 (non-FIFO)",13,10,"$"
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xfifo db "NS 16550A/Intel 82510 (FIFO)",13,10,"$"
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xdma db "IBM type 3 (FIFO/DMA)",13,10,"$"
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pas_de_ports db "No serial ports detected",13,10,"$"
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ends
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_stack segment para stack 'stack'
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db 200h dup (?)
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ends
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cseg segment para 'code'
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mov ax, bdseg
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mov es, ax ;ES := Bdseg
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mov ax, _data
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mov ds, ax ;DS := _data
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assume cs:cseg, ds:_data, es:bdseg, ss:_stack
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xor al, al ;# of serial ports = 0
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mov dx, [com1]
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cmp dx, 0
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je eoproc
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inc al ;# of serial ports = 1
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push ax
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call uartdet
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mov [uart1], al ;remember the type of this UART
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pop ax
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mov dx, [com2]
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cmp dx, 0
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je eoproc
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inc al ;# of serial ports = 2
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push ax
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call uartdet
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mov [uart2], al
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pop ax
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mov dx, [com3]
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cmp dx, 0
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je eoproc
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inc al ;# of serial ports = 3
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push ax
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call uartdet
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mov [uart3], al
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pop ax
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mov dx, [com4]
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cmp dx, 0
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je eoproc
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inc al ;# of serial ports = 4
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push ax
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call uartdet
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mov [uart4], al
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pop ax
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eoproc:
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call disp
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mov ah, 4ch
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int 21h
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delay macro
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jmp $+2
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endm
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uartdet proc near
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push bx
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push cx
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mov bx, dx ;save starting i/o addr
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add dx, 4 ;point to modem ctrl reg
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in al, dx ;disable interrupts
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push ax
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and al, 11111011b
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out dx, al
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mov ch, 0 ;assume type 0
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mov dx, bx
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add dx, 7 ;see if scratch reg exists
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mov al, 55h
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cli
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out dx, al ;write to scratch reg
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delay
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in al, dx ;read back
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cmp al, 55h
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jne endudet
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mov al, 0AAh
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out dx, al ;write to scratch reg
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delay
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in al, dx ;read back
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sti
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cmp al, 0AAh
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jne endudet
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inc ch ;assume type 1
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mov dx, bx
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add dx, 2 ;point to FIFO ctrl reg
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mov al, 7 ;attempt to enable FIFOs
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cli
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out dx, al
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delay
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in al, dx ;read interrupt ID reg
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sti
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and al, 0c0h ;strip all but FIFO bits
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jz endudet ;if bits 0, 16450/16550
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inc ch ;assume type 2
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mov dx, bx
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add dx, 8003h ;point to enhanced reg 1
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cli
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in al, dx
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push ax
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or al, 01000000b ;enable DMA transmission
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out dx, al
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push dx
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mov dx, bx
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add dx, 2
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in al, dx
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mov cl, al
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pop dx ;restore enhanced reg 1
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pop ax
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out dx, al
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sti
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and cl, 0c0h ;again mask all but FIFO ID
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cmp cl, 40h
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jne endudet ;must be type 2 (FIFO)
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inc ch ;must be type 3 (DMA)
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endudet:
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pop ax
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mov dx, bx
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add dx, 4 ;point to modem ctrl reg
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out dx, al ;restore initial condition
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xor ax, ax
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mov al, ch
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mov dx, bx
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pop cx
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pop bx
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ret
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uartdet endp
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disp proc near
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push ax ;save AX
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cmp al, 0 ;no serial ports?
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je noports
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mov bx, offset ds:[uart1] ;offset of UART type field
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mov di, offset ds:[portmsg][3] ;offset of 4th char in message
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mov cx, 0
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mov cl, al ;number of iterations
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@l1:
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;
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;write "COMx: " message substituting "x" for proper comport #
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;
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mov dl, 4
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sub dl, cl
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add dl, 30h ;convert to ASCII number
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mov [di], dl
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lea dx, portmsg
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mov ah, 9
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int 21h
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;
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;write the UART type now
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;
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mov dl, [bx]
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cmp dl, 0
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jne @t2
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lea dx, x8250
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mov ah, 9
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int 21h
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jmp @eot
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@t2: cmp dl, 1
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jne @t3
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lea dx, x16450
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mov ah, 9
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int 21h
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jmp @eot
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@t3: cmp dl, 2
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jne @t4
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lea dx, xfifo
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mov ah, 9
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int 21h
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jmp @eot
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@t4: lea dx, xdma
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mov ah, 9
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int 21h
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@eot: inc bx
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loop @l1
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jmp eoproc2
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noports:
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lea dx, pas_de_ports
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mov ah, 9
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int 21h
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eoproc2:
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pop ax
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ret
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disp endp
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ends
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end
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; EOF SERTYPE.ASM |