Subversion Repositories Kolibri OS

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;;                                                                 ;;

;; Copyright (C) KolibriOS team 2004-2012. All rights reserved.    ;;

;; Distributed under terms of the GNU General Public License       ;;

;;                                                                 ;;

;; simple AGP driver for KolibriOS                                 ;;

;;                                                                 ;;

;;    Written by hidnplayr@kolibrios.org                           ;;

;;                                                                 ;;

;;          GNU GENERAL PUBLIC LICENSE                             ;;

;;             Version 2, June 1991                                ;;

;;                                                                 ;;

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

format MS COFF

DEBUG                   equ 1

FAST_WRITE              equ 0

SIDE_BAND_ADDRESSING    equ 0

include 'proc32.inc'

include 'imports.inc'

struc IOCTL

{  .handle      dd ?

   .io_code     dd ?

   .input       dd ?

   .inp_size    dd ?

   .output      dd ?

   .out_size    dd ?

}

virtual at 0

  IOCTL IOCTL

end virtual

public START

public service_proc

public version

DRV_ENTRY       equ 1

DRV_EXIT        equ -1

SRV_GETVERSION  equ 0

SRV_DETECT      equ 1

API_VERSION     equ 1

section '.flat' code readable align 16

proc START stdcall, state:dword

        cmp     [state], 1

        jne     .exit

.entry:

     if DEBUG

        mov     esi, msgInit

        call    SysMsgBoardStr

     end if

        stdcall RegService, my_service, service_proc

        ret

.fail:

.exit:

        xor     eax, eax

        ret

endp

handle     equ  IOCTL.handle

io_code    equ  IOCTL.io_code

input      equ  IOCTL.input

inp_size   equ  IOCTL.inp_size

output     equ  IOCTL.output

out_size   equ  IOCTL.out_size

align 4

proc service_proc stdcall, ioctl:dword

        mov     ebx, [ioctl]

        mov     eax, [ebx+io_code]

        cmp     eax, SRV_GETVERSION

        jne     @F

        mov     eax, [ebx+output]

        cmp     [ebx+out_size], 4

        jne     .fail

        mov     [eax], dword API_VERSION

        xor     eax, eax

        ret

@@:

        mov     ebx, [ioctl]

        mov     eax, [ebx+io_code]

        cmp     eax, SRV_DETECT

        jne     @F

        call    detect

@@:

.fail:

        or      eax, -1

        ret

endp

restore   handle

restore   io_code

restore   input

restore   inp_size

restore   output

restore   out_size

align 4

proc detect

           locals

            last_bus dd ?

           endl

        xor     eax, eax

        mov     [bus], eax

        inc     eax

        call    PciApi          ; get last bus

        cmp     eax, -1

        je      .error

        mov     [last_bus], eax

  .next_bus:

        and     [devfn], 0

  .next_dev:

        stdcall PciRead16, [bus], [devfn], dword 0x0a   ; read class/subclass

        cmp     ax, 0x0302      ; display controller - 3d controller

        je      .found

        cmp     ax, 0x0380      ; display controller - other display controller

        je      .found

  .next:

        inc     [devfn]

        cmp     [devfn], 256

        jb      .next_dev

        mov     eax, [bus]

        inc     eax

        mov     [bus], eax

        cmp     eax, [last_bus]

        jna     .next_bus

  .error:

     if DEBUG

        mov     esi, msgFail

        call    SysMsgBoardStr

     end if

        xor     eax, eax

        inc     eax

        ret

  .found:

        stdcall PciRead8, [bus], [devfn], dword 0x06    ; read prog IF

        test    al, 1 shl 4                             ; got capabilities list?

        jnz     .got_capabilities_list

        ; TODO: Do it the old way: detect device and check with a list of known capabilities

        ; stupid pre PCI 2.2 board....

        jmp     .next

  .got_capabilities_list:

        stdcall PciRead8, [bus], [devfn], dword 0x34    ; read capabilities offset

        and     eax, 11111100b                          ; always dword aligned

        mov     esi, eax

  .read_capability:

        stdcall PciRead32, [bus], [devfn], esi          ; read capability

        cmp     al, 0x02                                ; AGP

        je      .got_agp

        movzx   esi, ah                                 ; pointer to next capability

        test    esi, esi

        jnz     .read_capability

        jmp     .next

  .got_agp:

        shl     eax, 16

        mov     [revision], al                          ; high nibble = major revision

                                                        ; low nibble = minor revision

        add     esi, 4

        and     al, 0xf0

        cmp     al, 0x30

        je      .agp_3

  .agp_2:

        stdcall PciRead32, [bus], [devfn], esi          ; read AGP status

        test    al, 100b

        jnz     .100b

        test    al, 10b

        jnz     .010b

        test    al, 1b

        jz      .error

  .001b:

        mov     [cmd], 001b

        jmp     .agp_go

  .010b:

        mov     [cmd], 010b

        jmp     .agp_go

  .100b:

        mov     [cmd], 100b

        jmp     .agp_go

  .agp_3:

        stdcall PciRead32, [bus], [devfn], esi          ; read AGP status

        test    al, 1 shl 3

        jz      .agp_2

        mov     [cmd], eax

        and     [cmd], 11b

        cmp     [cmd], 11b

        jne     .agp_go

        mov     [cmd], 10b

  .agp_go:

if FAST_WRITE

        test    ax, 1 shl 4

        jz      @f

        or      [cmd], 1 shl 4

  @@:

end if

if SIDE_BAND_ADDRESSING

        test    ax, 1 shl 9

        jz      @f

        or      [cmd], 1 shl 9

  @@:

end if

        add     esi, 4

        mov     eax, [cmd]

        or      eax, 1 shl 8                            ; enable AGP

        stdcall PciWrite32, [bus], [devfn], esi, eax    ; write AGP cmd

     if DEBUG

        mov     esi, msgOK

        call    SysMsgBoardStr

     end if

        ret

endp

; initialized data

align 4

version         dd (5 shl 16) or (API_VERSION and 0xFFFF)

my_service      db 'AGP', 0                             ; max 16 chars include zero

msgInit         db 'Searching AGP device...', 13, 10, 0

msgFail         db 'device not found', 13, 10, 0

msgOK           db 'AGP device enabled', 13, 10, 0

section '.data' data readable writable align 16

; uninitialized data

revision        db ?

cmd             dd ?

bus             dd ?

devfn           dd ?