; 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
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
and byte [esi+7000Bh], not 80h ; PIPEACONF: disable pipe
and byte [esi+7100Bh], not 80h ; PIPEBCONF: disable pipe
; or byte [esi+71403h], 80h ; VGACNTRL: VGA Display Disable
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
@@:
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+10183h], 80h ; DSPACNTR: enable Display Plane A
or byte [edx+1000Bh], 80h ; PIPEACONF: enable pipe
and byte [edx+1000Ah], not 0Ch ; PIPEACONF: enable Display+Cursor Planes
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 0x2582 ; i915g
dw 0x258a ; i915g
dw 0x2592 ; i915gm
dw 0x2772 ; i945g
dw 0x27a2 ; i945gm
dw 0x27ae ; i945gm
dw 0x2972 ; i965g
dw 0x2982 ; i965g
dw 0x2992 ; i965g
dw 0x29a2 ; i965g
dw 0x29b2 ; g33
dw 0x29c2 ; g33
dw 0x29d2 ; g33
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