322 lines
7.7 KiB
NASM
322 lines
7.7 KiB
NASM
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title "PCI bus Support Assembley Code"
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;++
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;
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; Copyright (c) 1989 Microsoft Corporation
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;
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; Module Name:
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;
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; hwpcia.asm
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;
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; Abstract:
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;
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; Calls the PCI rom function to determine what type of PCI
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; support is prsent, if any.
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;
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; Base code provided by Intel
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;
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; Author:
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;
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;--
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.386p
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.xlist
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include hwpci.inc
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.list
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if DBG
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extrn _BlPrint:PROC
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endif
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_DATA SEGMENT PARA USE16 PUBLIC 'DATA'
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if DBG
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cr equ 11
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PciBIOSSig db 'PCI: Scanning for "PCI "', cr, 0
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PciBIOSSigNotFound db 'PCI: BIOS "PCI " not found', cr, 0
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PciInt db 'PCI: Calling PCI_BIOS_PRESENT', cr, 0
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PciIntFailed db 'PCI: PCI_BIOS_PRESENT returned carry', cr, 0
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PciIntAhFailed db 'PCI: PCI_BIOS_PRESENT returned bad AH value', cr, 0
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PciIDFailed db 'PCI: PCI_BIOS_PRESENT invalid PCI id', cr, 0
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PciInt10IdFailed db 'PCI: PCI10_BIOS_PRESENT invalid PCI id', cr, 0
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PciFound db 'PCI BUS FOUND', cr, 0
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endif
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_DATA ends
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_TEXT SEGMENT PARA USE16 PUBLIC 'CODE'
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ASSUME CS: _TEXT
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;++
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;
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; BOOLEAN
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; HwGetPciSystemData (
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; PPCI_SYSTEM_DATA PciSystemData
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; )
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;
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; Routine Description:
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;
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; This function retrieves the PCI System Data
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;
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; Arguments:
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;
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; PciSystemData - Supplies a pointer to the structure which will
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; receive the PCI System Data.
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;
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; Return Value:
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;
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; True - PCI System Detected and System Data valid
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; False - PCI System Not Detected
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;
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;--
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SystemInfoPointer equ [bp + 4]
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BiosDateFound equ [bp + 6]
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public _HwGetPciSystemData
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_HwGetPciSystemData proc
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push bp ; The following INT 15H destroies
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mov bp, sp ; ALL the general registers.
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push si
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push di
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push bx
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;
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; Set for no PCI buses present
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;
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mov bx, SystemInfoPointer
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mov byte ptr [bx].NoBuses, 0
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;
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; Is the BIOS date >= 11/01/92? If so, make the int-1a call
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;
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push ds
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cmp byte ptr [BiosDateFound], 0
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jnz gpci00
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;
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; A valid BIOS date was not found, check for "PCI " in bios code.
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;
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if DBG
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push offset PciBIOSSig
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call _BlPrint
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add sp, 2
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endif
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mov bx, 0f000h
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mov ds, bx
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mov bx, 0fffch
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spci05: cmp dword ptr ds:[bx], ' ICP' ; 'PCI ' found at this addr?
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je short gpci00 ; found
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dec bx ; next location
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jnz short spci05 ; loop
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jmp spci_notfound ; wrapped, all done - not found
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gpci00:
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pop ds
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if DBG
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push offset PciInt
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call _BlPrint
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add sp, 2
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endif
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;
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; Check for a PCI system. Issue the PCI Present request.
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;
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mov ax, PCI_BIOS_PRESENT ; Real Mode Presence Request
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int PCI_INTERFACE_INT ; Just Do It!
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jc gpci10 ; Carry Set => No PCI
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cmp ah, 0 ; If PCI Present AH == 0
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jne gpci12 ; AH != 0 => No PCI
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cmp edx, " ICP" ; "PCI" Backwards (with a trailing space)
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jne gpci14 ; PCI Signature in EDX => PCI Exists
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;
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; Found PCI BIOS Version > 1.0
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;
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; The only thing left to do is squirrel the data away for the caller
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;
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mov dx, bx ; Save revision level
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mov bx, SystemInfoPointer ; Get caller's Pointer
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mov byte ptr [bx].MajorRevision, dh
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mov byte ptr [bx].MinorRevision, dl
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inc cl ; NoBuses = LastBus+1
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if 0
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;
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; Some PIC BIOS returns very large number of NoBuses. As a work-
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; around we mask the value to 16, unless the BIOS also return CH as
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; neg cl then we believe it.
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;
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cmp cl, 16
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jbe short @f
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neg ch
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inc ch
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cmp cl, ch
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je short @f
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mov cl, 16
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@@:
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endif
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mov byte ptr [bx].NoBuses, cl
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mov byte ptr [bx].HwMechanism, al
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jmp Done ; We're done
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if DBG
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gpci10: mov ax, offset PciIntFailed
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jmp short gpci_oldbios
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gpci12: mov ax, offset PciIntAhFailed
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jmp short gpci_oldbios
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gpci14: mov ax, offset PciIDFailed
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gpci_oldbios:
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push ax
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call _BlPrint
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add sp, 2
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else
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gpci10:
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gpci12:
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gpci14:
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endif
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;
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; Look for BIOS Version 1.0, This has a different function #
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;
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mov ax, PCI10_BIOS_PRESENT ; Real Mode Presence Request
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int PCI_INTERFACE_INT ; Just Do It!
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; Version 1.0 has "PCI " in dx and cx, the Version number in ax, and the
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; carry flag cleared. These are all the indications available.
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;
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cmp dx, "CP" ; "PC" Backwards
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jne gpci50 ; PCI Signature not in DX & CX => No PCI
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cmp cx, " I" ; "I " Backwards
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jne gpci50 ; PCI Signature not in EDX => No PCI
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;
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; Found PCI BIOS Version 1.0
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;
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; The only thing left to do is squirrel the data away for the caller
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;
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mov bx, SystemInfoPointer ; Get caller's Pointer
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mov byte ptr [bx].MajorRevision, ah
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mov byte ptr [bx].MinorRevision, al
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;
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; The Version 1.0 BIOS is only on early HW that had couldn't support
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; Multi Function devices or multiple bus's. So without reading any
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; device data, mark it as such.
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;
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mov byte ptr [bx].HwMechanism, 2
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mov byte ptr [bx].NoBuses, 1
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jmp Done
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spci_notfound:
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pop ds ; restore ds
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if DBG
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push offset PciBIOSSigNotFound
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call _BlPrint
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add sp, 2
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endif
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jmp gpci_exit
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if DBG
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gpci50: push offset PciInt10IdFailed
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jmp Done10
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Done: push offset PciFound
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Done10: call _BlPrint
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add sp, 2
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else
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; non-debug no prints
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gpci50:
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Done:
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endif
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gpci_exit:
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pop bx
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pop di
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pop si
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pop bp
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ret
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_HwGetPciSystemData endp
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RouteBuffer equ [bp + 4]
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ExclusiveIRQs equ [bp + 8]
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public _HwGetPciIrqRoutingOptions
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_HwGetPciIrqRoutingOptions proc
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push bp
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mov bp, sp ; Create 'C' stack frame.
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push ebx
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push edi
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push esi ; Save registers used.
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push es
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push ds
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xor edi, edi
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les di, RouteBuffer
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mov bx, 0f000h
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mov ds, bx
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xor ebx, ebx
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mov ax, 0B10Eh
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int PCI_INTERFACE_INT
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pop ds
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pop es
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mov di, ExclusiveIRQs
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mov [di], bx
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mov al, ah
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pop esi ; Restore registers.
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pop edi
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pop ebx
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pop bp
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ret
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_HwGetPciIrqRoutingOptions endp
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_TEXT ends
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end
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