466 lines
10 KiB
NASM
466 lines
10 KiB
NASM
; Stub of videodriver for Intel videocards.
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; (c) CleverMouse
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; When the start procedure gots control,
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; it tries to detect preferred resolution,
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; sets the detected resolution assuming 32-bpp VESA mode and exits
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; (without registering a service).
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; Detection can be overloaded with compile-time settings
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; use_predefined_mode/predefined_width/predefined_height.
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; set predefined resolution here
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use_predefined_mode = 0;1
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predefined_width = 0;1366
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predefined_height = 0;768
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; standard driver stuff
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format MS COFF
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DEBUG = 1
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include 'proc32.inc'
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include 'imports.inc'
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public START
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public version
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section '.flat' code readable align 16
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; the start procedure (see the description above)
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START:
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; 1. Detect device. Abort if not found.
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push esi
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call DetectDevice
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test esi, esi
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jz .return0
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; 2. Detect optimal mode unless the mode is given explicitly. Abort if failed.
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if use_predefined_mode = 0
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call DetectMode
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end if
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cmp [width], 0
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jz .return0_cleanup
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; 3. Set the detected mode.
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call SetMode
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; 4. Cleanup and return.
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.return0_cleanup:
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stdcall FreeKernelSpace, esi
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.return0:
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pop esi
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xor eax, eax
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ret 4
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; check that there is Intel videocard
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; if so, map MMIO registers and set internal variables
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; esi points to MMIO block; NULL means no device
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DetectDevice:
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; 1. Sanity check: check that we are dealing with Intel videocard.
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; Integrated video device for Intel is always at PCI:0:2:0.
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xor esi, esi ; initialize return value to NULL
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; 1a. Get PCI VendorID and DeviceID.
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push esi
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push 10h
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push esi
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call PciRead32
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; 1b. loword(eax) = ax = VendorID, hiword(eax) = DeviceID.
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; Test whether we have Intel chipset.
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cmp ax, 8086h
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jnz .return
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; 1c. Say hi including DeviceID.
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shr eax, 10h
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push edi
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pusha
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mov edi, pciid_text
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call WriteWord
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mov esi, hellomsg
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call SysMsgBoardStr
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popa
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; 1d. Test whether we know this DeviceID.
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; If this is the case, remember the position of the device in line of Intel cards;
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; this knowledge will be useful later.
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; Tested on devices with id: 8086:0046, partially 8086:2A02.
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mov ecx, pciids_num
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mov edi, pciids
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repnz scasw
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pop edi
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jnz .return_unknown_pciid
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sub ecx, pciids_num - 1
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neg ecx
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mov [deviceType], ecx
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; 1e. Continue saying hi with positive intonation.
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pusha
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mov esi, knownmsg
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call SysMsgBoardStr
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popa
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; 2. Prepare MMIO region to control the card.
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; 2a. Read MMIO physical address from PCI config space.
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push 10h
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cmp ecx, i9xx_start
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jae @f
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mov byte [esp], 14h
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@@:
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push 10h
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push esi
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call PciRead32
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; 2b. Mask out PCI region type, lower 4 bits.
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and al, not 0xF
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; 2c. Create virtual mapping of the physical memory.
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push 1Bh
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push 100000h
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push eax
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call MapIoMem
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; 3. Return.
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xchg esi, eax
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.return:
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ret
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; 1f. If we do not know DeviceID, continue saying hi with negative intonation.
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.return_unknown_pciid:
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pusha
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mov esi, unknownmsg
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call SysMsgBoardStr
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popa
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ret
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; Convert word in ax to hexadecimal text in edi, advance edi.
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WriteWord:
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; 1. Convert high byte.
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push eax
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mov al, ah
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call WriteByte
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pop eax
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; 2. Convert low byte.
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; Fall through to WriteByte; ret from WriteByte is ret from WriteWord too.
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; Convert byte in al to hexadecimal text in edi, advance edi.
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WriteByte:
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; 1. Convert high nibble.
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push eax
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shr al, 4
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call WriteNibble
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pop eax
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; 2. Convert low nibble.
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and al, 0xF
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; Fall through to WriteNibble; ret from WriteNibble is ret from WriteByte too.
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; Convert nibble in al to hexadecimal text in edi, advance edi.
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WriteNibble:
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; Obvious, isn't it?
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cmp al, 10
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sbb al, 69h
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das
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stosb
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ret
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if use_predefined_mode = 0
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; detect resolution of the flat panel
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DetectMode:
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push esi edi
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; 1. Get the location of block of GMBUS* registers.
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; Starting with Ironlake, GMBUS* registers were moved.
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add esi, 5100h
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cmp [deviceType], ironlake_start
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jb @f
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add esi, 0xC0000
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@@:
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; 2. Initialize GMBUS engine.
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mov edi, edid
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mov ecx, 0x10000
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@@:
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test byte [esi+8+1], 80h
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loopnz @b
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jnz .fail
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mov dword [esi], 3
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test byte [esi+8+1], 4
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jz .noreset
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call ResetGMBus
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jnz .fail
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.noreset:
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; 3. Send read command.
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and dword [esi+20h], 0
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mov dword [esi+4], 4E8000A1h
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; 4. Wait for data, writing to the buffer as data arrive.
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.getdata:
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mov ecx, 0x10000
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@@:
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test byte [esi+8+1], 8
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loopz @b
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test byte [esi+8+1], 4
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jz .dataok
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call ResetGMBus
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jmp .fail
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.dataok:
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mov eax, [esi+0Ch]
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stosd
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cmp edi, edid+80h
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jb .getdata
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; 5. Wait for bus idle.
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mov ecx, 0x10000
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@@:
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test byte [esi+8+1], 2
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loopnz @b
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; 6. We got EDID; dump it if DEBUG.
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if DEBUG
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pusha
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xor ecx, ecx
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mov esi, edid
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mov edi, edid_text
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.dumploop:
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lodsb
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call WriteByte
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mov al, ' '
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stosb
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inc cl
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test cl, 15
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jnz @f
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mov byte [edi-1], 13
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mov al, 10
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stosb
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@@:
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test cl, cl
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jns .dumploop
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mov esi, edidmsg
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call SysMsgBoardStr
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popa
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end if
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; 7. Test whether EDID is good.
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; 7a. Signature: 00 FF FF FF FF FF FF 00.
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mov esi, edid
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cmp dword [esi], 0xFFFFFF00
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jnz .fail
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cmp dword [esi+4], 0x00FFFFFF
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jnz .fail
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; 7b. Checksum must be zero.
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xor edx, edx
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mov ecx, 80h
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@@:
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lodsb
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add dl, al
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loop @b
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jnz .fail
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; 8. Get width and height from EDID.
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xor eax, eax
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mov ah, [esi-80h+3Ah]
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shr ah, 4
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mov al, [esi-80h+38h]
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mov [width], eax
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mov ah, [esi-80h+3Dh]
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shr ah, 4
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mov al, [esi-80h+3Bh]
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mov [height], eax
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; 9. Return.
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.fail:
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pop edi esi
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ret
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; reset bus, clear all errors
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ResetGMBus:
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; look into the PRM
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mov dword [esi+4], 80000000h
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mov dword [esi+4], 0
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mov ecx, 0x10000
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@@:
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test byte [esi+8+1], 2
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loopnz @b
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ret
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end if
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; set resolution [width]*[height]
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SetMode:
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; 1. Program the registers of videocard.
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; look into the PRM
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cli
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; or byte [esi+7000Ah], 0Ch ; PIPEACONF: disable Display+Cursor Planes
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; or byte [esi+7100Ah], 0Ch ; PIPEBCONF: disable Display+Cursor Planes
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xor eax, eax
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xor edx, edx
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cmp [deviceType], i965_start
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jb @f
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mov dl, 9Ch - 84h
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@@:
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; or byte [esi+71403h], 80h ; VGACNTRL: VGA Display Disable
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and byte [esi+70080h], not 27h ; CURACNTR: disable cursor A
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mov dword [esi+70084h], eax ; CURABASE: force write to CURA* regs
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and byte [esi+700C0h], not 27h ; CURBCNTR: disable cursor B
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mov dword [esi+700C4h], eax ; CURBBASE: force write to CURB* regs
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and byte [esi+70183h], not 80h ; DSPACNTR: disable Primary A Plane
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mov dword [esi+edx+70184h], eax ; DSPALINOFF/DSPASURF: force write to DSPA* regs
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and byte [esi+71183h], not 80h ; DSPBCNTR: disable Primary B Plane
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mov dword [esi+edx+71184h], eax ; DSPBLINOFF/DSPBSURF: force write to DSPB* regs
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if 1
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cmp [deviceType], ironlake_start
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jae .disable_pipes
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mov edx, 10000h
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or byte [esi+70024h], 2 ; PIPEASTAT: clear VBLANK status
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or byte [esi+71024h], 2 ; PIPEBSTAT: clear VBLANK status
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.wait_vblank_preironlake1:
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mov ecx, 1000h
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loop $
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test byte [esi+7000Bh], 80h ; PIPEACONF: pipe A active?
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jz @f
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test byte [esi+70024h], 2 ; PIPEASTAT: got VBLANK?
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jz .wait_vblank_preironlake2
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@@:
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test byte [esi+7100Bh], 80h ; PIPEBCONF: pipe B active?
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jz .disable_pipes
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test byte [esi+71024h], 2 ; PIPEBSTAT: got VBLANK?
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jnz .disable_pipes
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.wait_vblank_preironlake2:
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dec edx
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jnz .wait_vblank_preironlake1
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jmp .not_disabled
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.disable_pipes:
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end if
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and byte [esi+7000Bh], not 80h ; PIPEACONF: disable pipe
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and byte [esi+7100Bh], not 80h ; PIPEBCONF: disable pipe
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if 1
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mov edx, 10000h
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@@:
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mov ecx, 1000h
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loop $
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test byte [esi+7000Bh], 40h ; PIPEACONF: wait until pipe disabled
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jz @f
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dec edx
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jnz @b
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.not_disabled:
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sti
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jmp .return
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@@:
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test byte [esi+7100Bh], 40h ; PIPEBCONF: wait until pipe disabled
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jz @f
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mov ecx, 1000h
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loop $
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dec edx
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jnz @b
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jmp .not_disabled
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@@:
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else
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; alternative way of waiting for pipe stop, works too
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mov edx, 1000h
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.dis1:
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push dword [esi+71000h]
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push dword [esi+70000h]
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mov ecx, 10000h
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loop $
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pop eax
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xor eax, [esi+70000h]
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and eax, 1FFFh
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pop eax
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jnz .notdis1
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xor eax, [esi+71000h]
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and eax, 1FFFh
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jz .disabled
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.notdis1:
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dec edx
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jnz .dis1
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.not_disabled:
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sti
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jmp .return
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.disabled:
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end if
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lea eax, [esi+61183h]
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cmp [deviceType], ironlake_start
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jb @f
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add eax, 0xE0000 - 0x60000
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@@:
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lea edx, [esi+60000h]
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test byte [eax], 40h
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jz @f
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add edx, 1000h
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@@:
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mov eax, [width]
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dec eax
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shl eax, 16
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mov ax, word [height]
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dec eax
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mov dword [edx+1Ch], eax ; PIPEASRC: set source image size
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ror eax, 16
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mov dword [edx+10190h], eax ; for old cards
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mov ecx, [width]
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add ecx, 15
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and ecx, not 15
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shl ecx, 2
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mov dword [edx+10188h], ecx ; DSPASTRIDE: set scanline length
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and byte [esi+61233h], not 80h ; PFIT_CONTROL: disable panel fitting
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or byte [edx+1000Bh], 80h ; PIPEACONF: enable pipe
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; and byte [edx+1000Ah], not 0Ch ; PIPEACONF: enable Display+Cursor Planes
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or byte [edx+10183h], 80h ; DSPACNTR: enable Display Plane A
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sti
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; 2. Notify the kernel that resolution has changed.
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call GetDisplay
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mov edx, [width]
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mov dword [eax+8], edx
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mov edx, [height]
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mov dword [eax+0Ch], edx
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mov [eax+18h], ecx
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mov eax, [width]
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dec eax
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dec edx
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call SetScreen
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.return:
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ret
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align 4
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hellomsg db 'Intel videocard detected, PciId=8086:'
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pciid_text db '0000'
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db ', which is ', 0
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knownmsg db 'known',13,10,0
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unknownmsg db 'unknown',13,10,0
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if DEBUG
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edidmsg db 'EDID successfully read:',13,10
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edid_text rb 8*(16*3+1)
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db 0
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end if
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version:
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dd 0x50005
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width dd predefined_width
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height dd predefined_height
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pciids:
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dw 0x3577 ; i830m
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dw 0x2562 ; 845g
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dw 0x3582 ; i855gm
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i865_start = ($ - pciids) / 2
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dw 0x2572 ; i865g
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i9xx_start = ($ - pciids) / 2
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dw 0x2582 ; i915g
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dw 0x258a ; e7221g (i915g)
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dw 0x2592 ; i915gm
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dw 0x2772 ; i945g
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dw 0x27a2 ; i945gm
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dw 0x27ae ; i945gme
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i965_start = ($ - pciids) / 2
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dw 0x2972 ; i946qz (i965g)
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dw 0x2982 ; g35g (i965g)
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dw 0x2992 ; i965q (i965g)
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dw 0x29a2 ; i965g
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dw 0x29b2 ; q35g
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dw 0x29c2 ; g33g
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dw 0x29d2 ; q33g
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dw 0x2a02 ; i965gm
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dw 0x2a12 ; i965gm
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dw 0x2a42 ; gm45
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dw 0x2e02 ; g45
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dw 0x2e12 ; g45
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dw 0x2e22 ; g45
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dw 0x2e32 ; g45
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dw 0x2e42 ; g45
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dw 0x2e92 ; g45
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dw 0xa001 ; pineview
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dw 0xa011 ; pineview
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ironlake_start = ($ - pciids) / 2
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dw 0x0042 ; ironlake_d
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dw 0x0046 ; ironlake_m
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dw 0x0102 ; sandybridge_d
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dw 0x0112 ; sandybridge_d
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dw 0x0122 ; sandybridge_d
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dw 0x0106 ; sandybridge_m
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dw 0x0116 ; sandybridge_m
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dw 0x0126 ; sandybridge_m
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dw 0x010A ; sandybridge_d
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pciids_num = ($ - pciids) / 2
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align 4
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deviceType dd ?
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edid rb 0x80
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