252 lines
3.3 KiB
C
252 lines
3.3 KiB
C
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#define DMASTATUSREG 0x8
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#define DMA8SINGLEMASKREG 0xa
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#define DMA16SINGLEMASKREG 0xd4
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#define DMA8MASTERMASKREG 0xf
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#define DMA16MASTERMASKREG 0xde
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#define DMA8CLEARFLIPFLOP 0xc
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#define DMA16CLEARFLIPFLOP 0xd8
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#define DMA8BASE 0x0
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#define DMA16BASE 0xc0
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ULONG page[8] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a };
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VOID __inline UnmaskDmaChannel(ULONG channel)
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{
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ASSERT ( channel<8 && channel!=4 );
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if (channel<4) {
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__asm {
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mov eax,channel
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out DMA8SINGLEMASKREG,al
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}
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}
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else if (channel<8) {
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__asm {
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mov eax,channel
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sub eax,4
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out DMA16SINGLEMASKREG,al
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}
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}
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}
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VOID __inline MaskDmaChannel(ULONG channel)
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{
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ASSERT ( channel<8 && channel!=4 );
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if (channel<4) {
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__asm {
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mov eax,channel
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or eax,0x4
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out DMA8SINGLEMASKREG,al
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}
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}
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else if (channel<8) {
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__asm {
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mov eax,channel
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out DMA16SINGLEMASKREG,al
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}
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}
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}
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// This reads the DMA controller mask register.
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ULONG __inline ReadDMAMask(VOID)
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{
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__asm {
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xor eax,eax
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in al,DMA8MASTERMASKREG
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ror eax,4
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in al,DMA16MASTERMASKREG
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and al,0xf
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rol eax,4
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}
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}
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VOID __inline ReadDmaPosition(ULONG channel, PULONG pCurrentDmaPosition)
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{
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ASSERT ( channel<8 && channel!=4 );
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if (channel<4) {
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__asm {
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// First clear the flip flop.
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xor eax,eax
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out DMA8CLEARFLIPFLOP, al
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// Read low byte and save it away.
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mov edx, channel
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shl edx, 1
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in al, dx
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ror eax,8
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// Read high byte and save it away.
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in al, dx
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ror eax,8
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// Read page byte.
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shl edx, 1
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add edx, offset page
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mov edx, dword ptr[edx]
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in al, dx
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ror eax,8
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// Read hi-page byte. Ignore if 0xff.
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add edx,0x400
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in al, dx
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sub al, 0xff
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jz done8
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add al, 0xff
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done8:
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ror eax,8
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mov edx, pCurrentDmaPosition
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mov dword ptr [edx], eax
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}
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}
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else if (channel<8) {
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__asm {
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// First clear the flip flop.
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xor eax,eax
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out DMA16CLEARFLIPFLOP, al
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// Read low byte and save it away.
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mov edx, channel
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sub edx, 4
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shl edx, 2
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add edx, DMA16BASE
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in al, dx
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ror eax,8
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// Read high byte and save it away.
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// We left shift bottom 16 bits by 1 and or top bit into page.
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in al, dx
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ror eax,7
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mov ah, al
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// Read page byte.
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mov edx, channel
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shl edx, 2
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add edx, offset page
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mov edx, dword ptr[edx]
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in al, dx
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// Or in bit 15 of word address and save away page byte.
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or al, ah
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ror eax,8
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// Read hi-page byte. Ignore if 0xff.
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add edx,0x400
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in al, dx
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sub al, 0xff
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jz done16
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add al, 0xff
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done16:
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ror eax,8
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mov edx, pCurrentDmaPosition
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mov dword ptr [edx], eax
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}
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}
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}
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VOID __inline ReadDmaCount(ULONG channel, PULONG pCurrentDmaCount)
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{
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ASSERT ( channel<8 && channel!=4 );
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if (channel<4) {
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__asm {
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// First clear the flip flop.
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xor eax,eax
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out DMA8CLEARFLIPFLOP, al
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// Read low byte and save it away.
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mov edx, channel
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shl edx, 1
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inc edx
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in al, dx
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ror eax,8
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// Read high byte and fixup count.
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in al, dx
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rol eax,8
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mov edx, pCurrentDmaCount
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mov dword ptr [edx], eax
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}
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}
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else if (channel<8) {
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__asm {
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// First clear the flip flop.
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xor eax,eax
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out DMA16CLEARFLIPFLOP, al
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// Read low byte and save it away.
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mov edx, channel
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sub edx, 4
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shl edx, 2
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add edx, 2
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add edx, DMA16BASE
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in al, dx
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ror eax,8
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// Read high byte and fixup count.
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in al, dx
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rol eax,9
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mov edx, pCurrentDmaCount
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mov dword ptr [edx], eax
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}
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}
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}
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