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; Stub of videodriver for Intel videocards.

; (c) CleverMouse

; When the start procedure gots control,

; it tries to detect preferred resolution,

; sets the detected resolution assuming 32-bpp VESA mode and exits

; (without registering a service).

; Detection can be overloaded with compile-time settings

; use_predefined_mode/predefined_width/predefined_height.

; set predefined resolution here

use_predefined_mode = 0;1

predefined_width = 0;1366

predefined_height = 0;768

; standard driver stuff

format MS COFF

DEBUG = 1

include 'proc32.inc'

include 'imports.inc'

public START

public version

section '.flat' code readable align 16

; the start procedure (see the description above)

START:

; 1. Detect device. Abort if not found.

        push    esi

        call    DetectDevice

        test    esi, esi

        jz      .return0

; 2. Detect optimal mode unless the mode is given explicitly. Abort if failed.

if use_predefined_mode = 0

        call    DetectMode

end if

        cmp     [width], 0

        jz      .return0_cleanup

; 3. Set the detected mode.

        call    SetMode

; 4. Cleanup and return.

.return0_cleanup:

        stdcall FreeKernelSpace, esi

.return0:

        pop     esi

        xor     eax, eax

        ret     4

; check that there is Intel videocard

; if so, map MMIO registers and set internal variables

; esi points to MMIO block; NULL means no device

DetectDevice:

; 1. Sanity check: check that we are dealing with Intel videocard.

; Integrated video device for Intel is always at PCI:0:2:0.

        xor     esi, esi        ; initialize return value to NULL

; 1a. Get PCI VendorID and DeviceID.

        push    esi

        push    10h

        push    esi

        call    PciRead32

; 1b. loword(eax) = ax = VendorID, hiword(eax) = DeviceID.

; Test whether we have Intel chipset.

        cmp     ax, 8086h

        jnz     .return

; 1c. Say hi including DeviceID.

        shr     eax, 10h

        push    edi

        pusha

        mov     edi, pciid_text

        call    WriteWord

        mov     esi, hellomsg

        call    SysMsgBoardStr

        popa

; 1d. Test whether we know this DeviceID.

; If this is the case, remember the position of the device in line of Intel cards;

; this knowledge will be useful later.

; Tested on devices with id: 8086:0046, partially 8086:2A02.

        mov     ecx, pciids_num

        mov     edi, pciids

        repnz scasw

        pop     edi

        jnz     .return_unknown_pciid

        sub     ecx, pciids_num - 1

        neg     ecx

        mov     [deviceType], ecx

; 1e. Continue saying hi with positive intonation.

        pusha

        mov     esi, knownmsg

        call    SysMsgBoardStr

        popa

; 2. Prepare MMIO region to control the card.

; 2a. Read MMIO physical address from PCI config space.

        push    10h

        cmp     ecx, i9xx_start

        jae     @f

        mov     byte [esp], 14h

@@:

        push    10h

        push    esi

        call    PciRead32

; 2b. Mask out PCI region type, lower 4 bits.

        and     al, not 0xF

; 2c. Create virtual mapping of the physical memory.

        push    1Bh

        push    100000h

        push    eax

        call    MapIoMem

; 3. Return.

        xchg    esi, eax

.return:

        ret

; 1f. If we do not know DeviceID, continue saying hi with negative intonation.

.return_unknown_pciid:

        pusha

        mov     esi, unknownmsg

        call    SysMsgBoardStr

        popa

        ret

; Convert word in ax to hexadecimal text in edi, advance edi.

WriteWord:

; 1. Convert high byte.

        push    eax

        mov     al, ah

        call    WriteByte

        pop     eax

; 2. Convert low byte.

; Fall through to WriteByte; ret from WriteByte is ret from WriteWord too.

; Convert byte in al to hexadecimal text in edi, advance edi.

WriteByte:

; 1. Convert high nibble.

        push    eax

        shr     al, 4

        call    WriteNibble

        pop     eax

; 2. Convert low nibble.

        and     al, 0xF

; Fall through to WriteNibble; ret from WriteNibble is ret from WriteByte too.

; Convert nibble in al to hexadecimal text in edi, advance edi.

WriteNibble:

; Obvious, isn't it?

        cmp     al, 10

        sbb     al, 69h

        das

        stosb

        ret

if use_predefined_mode = 0

; detect resolution of the flat panel

DetectMode:

        push    esi edi

; 1. Get the location of block of GMBUS* registers.

; Starting with Ironlake, GMBUS* registers were moved.

        add     esi, 5100h

        cmp     [deviceType], ironlake_start

        jb      @f

        add     esi, 0xC0000

@@:

; 2. Initialize GMBUS engine.

        mov     edi, edid

        mov     ecx, 0x10000

@@:

        test    byte [esi+8+1], 80h

        loopnz  @b

        jnz     .fail

        mov     dword [esi], 3

        test    byte [esi+8+1], 4

        jz      .noreset

        call    ResetGMBus

        jnz     .fail

.noreset:

; 3. Send read command.

        and     dword [esi+20h], 0

        mov     dword [esi+4], 4E8000A1h

; 4. Wait for data, writing to the buffer as data arrive.

.getdata:

        mov     ecx, 0x10000

@@:

        test    byte [esi+8+1], 8

        loopz   @b

        test    byte [esi+8+1], 4

        jz      .dataok

        call    ResetGMBus

        jmp     .fail

.dataok:

        mov     eax, [esi+0Ch]

        stosd

        cmp     edi, edid+80h

        jb      .getdata

; 5. Wait for bus idle.

        mov     ecx, 0x10000

@@:

        test    byte [esi+8+1], 2

        loopnz  @b

; 6. We got EDID; dump it if DEBUG.

if DEBUG

        pusha

        xor     ecx, ecx

        mov     esi, edid

        mov     edi, edid_text

.dumploop:

        lodsb

        call    WriteByte

        mov     al, ' '

        stosb

        inc     cl

        test    cl, 15

        jnz     @f

        mov     byte [edi-1], 13

        mov     al, 10

        stosb

@@:

        test    cl, cl

        jns     .dumploop

        mov     esi, edidmsg

        call    SysMsgBoardStr

        popa

end if

; 7. Test whether EDID is good.

; 7a. Signature: 00 FF FF FF FF FF FF 00.

        mov     esi, edid

        cmp     dword [esi], 0xFFFFFF00

        jnz     .fail

        cmp     dword [esi+4], 0x00FFFFFF

        jnz     .fail

; 7b. Checksum must be zero.

        xor     edx, edx

        mov     ecx, 80h

@@:

        lodsb

        add     dl, al

        loop    @b

        jnz     .fail

; 8. Get width and height from EDID.

        xor     eax, eax

        mov     ah, [esi-80h+3Ah]

        shr     ah, 4

        mov     al, [esi-80h+38h]

        mov     [width], eax

        mov     ah, [esi-80h+3Dh]

        shr     ah, 4

        mov     al, [esi-80h+3Bh]

        mov     [height], eax

; 9. Return.

.fail:

        pop     edi esi

        ret

; reset bus, clear all errors

ResetGMBus:

; look into the PRM

        mov     dword [esi+4], 80000000h

        mov     dword [esi+4], 0

        mov     ecx, 0x10000

@@:

        test    byte [esi+8+1], 2

        loopnz  @b

        ret

end if

; set resolution [width]*[height]

SetMode:

; 1. Program the registers of videocard.

; look into the PRM

        cli

;       or      byte [esi+7000Ah], 0Ch  ; PIPEACONF: disable Display+Cursor Planes

;       or      byte [esi+7100Ah], 0Ch  ; PIPEBCONF: disable Display+Cursor Planes

        xor     eax, eax

        xor     edx, edx

        cmp     [deviceType], i965_start

        jb      @f

        mov     dl, 9Ch - 84h

@@:

;       or      byte [esi+71403h], 80h  ; VGACNTRL: VGA Display Disable

        and     byte [esi+70080h], not 27h      ; CURACNTR: disable cursor A

        mov     dword [esi+70084h], eax ; CURABASE: force write to CURA* regs

        and     byte [esi+700C0h], not 27h      ; CURBCNTR: disable cursor B

        mov     dword [esi+700C4h], eax ; CURBBASE: force write to CURB* regs

        and     byte [esi+70183h], not 80h      ; DSPACNTR: disable Primary A Plane

        mov     dword [esi+edx+70184h], eax     ; DSPALINOFF/DSPASURF: force write to DSPA* regs

        and     byte [esi+71183h], not 80h      ; DSPBCNTR: disable Primary B Plane

        mov     dword [esi+edx+71184h], eax     ; DSPBLINOFF/DSPBSURF: force write to DSPB* regs

if 1

        cmp     [deviceType], ironlake_start

        jae     .disable_pipes

        mov     edx, 10000h

        or      byte [esi+70024h], 2    ; PIPEASTAT: clear VBLANK status

        or      byte [esi+71024h], 2    ; PIPEBSTAT: clear VBLANK status

.wait_vblank_preironlake1:

        mov     ecx, 1000h

        loop    $

        test    byte [esi+7000Bh], 80h          ; PIPEACONF: pipe A active?

        jz      @f

        test    byte [esi+70024h], 2            ; PIPEASTAT: got VBLANK?

        jz      .wait_vblank_preironlake2

@@:

        test    byte [esi+7100Bh], 80h          ; PIPEBCONF: pipe B active?

        jz      .disable_pipes

        test    byte [esi+71024h], 2            ; PIPEBSTAT: got VBLANK?

        jnz     .disable_pipes

.wait_vblank_preironlake2:

        dec     edx

        jnz     .wait_vblank_preironlake1

        jmp     .not_disabled

.disable_pipes:

end if

        and     byte [esi+7000Bh], not 80h      ; PIPEACONF: disable pipe

        and     byte [esi+7100Bh], not 80h      ; PIPEBCONF: disable pipe

if 1

        mov     edx, 10000h

@@:

        mov     ecx, 1000h

        loop    $

        test    byte [esi+7000Bh], 40h  ; PIPEACONF: wait until pipe disabled

        jz      @f

        dec     edx

        jnz     @b

.not_disabled:

        sti

        jmp     .return

@@:

        test    byte [esi+7100Bh], 40h  ; PIPEBCONF: wait until pipe disabled

        jz      @f

        mov     ecx, 1000h

        loop    $

        dec     edx

        jnz     @b

        jmp     .not_disabled

@@:

else

; alternative way of waiting for pipe stop, works too

        mov     edx, 1000h

.dis1:

        push    dword [esi+71000h]

        push    dword [esi+70000h]

        mov     ecx, 10000h

        loop    $

        pop     eax

        xor     eax, [esi+70000h]

        and     eax, 1FFFh

        pop     eax

        jnz     .notdis1

        xor     eax, [esi+71000h]

        and     eax, 1FFFh

        jz      .disabled

.notdis1:

        dec     edx

        jnz     .dis1

.not_disabled:

        sti

        jmp     .return

.disabled:

end if

        lea     eax, [esi+61183h]

        cmp     [deviceType], ironlake_start

        jb      @f

        add     eax, 0xE0000 - 0x60000

@@:

        lea     edx, [esi+60000h]

        test    byte [eax], 40h

        jz      @f

        add     edx, 1000h

@@:

        mov     eax, [width]

        dec     eax

        shl     eax, 16

        mov     ax, word [height]

        dec     eax

        mov     dword [edx+1Ch], eax    ; PIPEASRC: set source image size

        ror     eax, 16

        mov     dword [edx+10190h], eax ; for old cards

        mov     ecx, [width]

        add     ecx, 15

        and     ecx, not 15

        shl     ecx, 2

        mov     dword [edx+10188h], ecx ; DSPASTRIDE: set scanline length

        and     byte [esi+61233h], not 80h      ; PFIT_CONTROL: disable panel fitting

        or      byte [edx+1000Bh], 80h          ; PIPEACONF: enable pipe

;       and     byte [edx+1000Ah], not 0Ch      ; PIPEACONF: enable Display+Cursor Planes

        or      byte [edx+10183h], 80h          ; DSPACNTR: enable Display Plane A

        sti

; 2. Notify the kernel that resolution has changed.

        call    GetDisplay

        mov     edx, [width]

        mov     dword [eax+8], edx

        mov     edx, [height]

        mov     dword [eax+0Ch], edx

        mov     [eax+18h], ecx

        mov     eax, [width]

        dec     eax

        dec     edx

        call    SetScreen

.return:

        ret

align 4

hellomsg        db      'Intel videocard detected, PciId=8086:'

pciid_text      db      '0000'

                db      ', which is ', 0

knownmsg        db      'known',13,10,0

unknownmsg      db      'unknown',13,10,0

if DEBUG

edidmsg         db      'EDID successfully read:',13,10

edid_text       rb      8*(16*3+1)

                db      0

end if

version:

        dd      0x50005

width   dd      predefined_width

height  dd      predefined_height

pciids:

        dw      0x3577          ; i830m

        dw      0x2562          ; 845g

        dw      0x3582          ; i855gm

i865_start = ($ - pciids) / 2

        dw      0x2572          ; i865g

i9xx_start = ($ - pciids) / 2

        dw      0x2582  ; i915g

        dw      0x258a  ; e7221g (i915g)

        dw      0x2592  ; i915gm

        dw      0x2772  ; i945g

        dw      0x27a2  ; i945gm

        dw      0x27ae  ; i945gme

i965_start = ($ - pciids) / 2

        dw      0x2972  ; i946qz (i965g)

        dw      0x2982  ; g35g (i965g)

        dw      0x2992  ; i965q (i965g)

        dw      0x29a2  ; i965g

        dw      0x29b2  ; q35g

        dw      0x29c2  ; g33g

        dw      0x29d2  ; q33g

        dw      0x2a02  ; i965gm

        dw      0x2a12  ; i965gm

        dw      0x2a42  ; gm45

        dw      0x2e02  ; g45

        dw      0x2e12  ; g45

        dw      0x2e22  ; g45

        dw      0x2e32  ; g45

        dw      0x2e42  ; g45

        dw      0x2e92  ; g45

        dw      0xa001  ; pineview

        dw      0xa011  ; pineview

ironlake_start = ($ - pciids) / 2

        dw      0x0042  ; ironlake_d

        dw      0x0046  ; ironlake_m

        dw      0x0102  ; sandybridge_d

        dw      0x0112  ; sandybridge_d

        dw      0x0122  ; sandybridge_d

        dw      0x0106  ; sandybridge_m

        dw      0x0116  ; sandybridge_m

        dw      0x0126  ; sandybridge_m

        dw      0x010A  ; sandybridge_d

pciids_num = ($ - pciids) / 2

align 4

deviceType      dd      ?

edid    rb      0x80