mirror of
https://github.com/rdolbeau/NuBusFPGA.git
synced 2024-06-02 03:41:29 +00:00
104 lines
4.0 KiB
ArmAsm
104 lines
4.0 KiB
ArmAsm
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.byte sExec2 /* Code revision (Primary init) */
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.byte sCPU68020 /* CPU type is 68020 */
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.short 0 /* Reserved */
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.long Begin-. /* Offset to code. */
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Begin:
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movew #1,%A0@(seStatus) /* VendorStatus <- 1 {Code was executed} */
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movel %A0,%A3 /* save param block {A0 is destroyed} */
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/* Turn the slot number into a base address. */
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moveq #0,%D0 /* D0 <- 00000000 */
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MOVE.B %A0@(seSlot),%D0 /* D0 <- 0000000s */
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LSL.W #4,%D0 /* D0 <- 000000s0 */
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/* OR.B %A0@(seSlot),%D0 /* D0 <- 000000ss */
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OR.W #0xF00,%D0 /* D0 <- 00000Fss */
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SWAP %D0 /* D0 <- 0Fss0000 */
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LSL.L #4,%D0 /* D0 <- Fss00000 */
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movel %D0,%A2 /* A2 <- Base address to the slot. */
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/* Reset the hardware. */
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/* DO YOUR RESET STUFF HERE */
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/* Set mode to one bit per pixel. ; */
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/* DO YOUR MODE SETTING HERE */
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/* Disable interrupts. ; */
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movel %A2,%A0 /* get slot base */
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ADD.L #0x00900004,%A0 /* Adjust the base */ /* FIXME */
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CLR.B (%A0) /* Disable interrupt from card */
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/* set the color table to black and white */
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/* SET THE TABLE HERE */
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/* The Apple Video card configuration ROM has two video sResources conforming to the */
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/* two possible different memory configurations. Now we want to figure out which */
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/* of the configurations we have, and delete the incorrect video sResource from */
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/* the slot resource table. */
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/* */
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/* size the RAM on the video card. To do this, we look for a nice longword in the second */
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/* half of the frame buffer array that doesn't show up on the screen. I've selected the */
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/* last longword of the first scanline that is a multiple of 8 in the second RAM bank (line 264). */
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/* This alignment guarantees that this memory is off the right edge in all pixel depths */
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/* when the frame buffer base addr is on a normal page boundary. */
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/* */
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/* */
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/* */
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TestPos = (265*1024)-4 /* */
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TestPat = 0x4d434132 /* test bit pattern */
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SUBA #smParamBlockSize,%SP /* make an SDM parameter block on stack */
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movel %SP,%A0 /* get pointer to parm block now */
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MOVE.B seSlot(%A3),spSlot(%A0) /* put slot in pBlock */
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CLR.B spExtDev(%A0) /* external device = 0 */
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/* movel #TestPos,%D1 /* get offset in %D1 */
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/* movel #TestPat,(%A2,%D1.L) /* write to alleged RAM */
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/* movel #-1,-(%SP) /* write out some garbage to clear data lines */
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/* ADDQ #4,%SP /* and pitch it */
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/* movel (%A2,%D1.L),%D0 /* read pattern back */
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/* CMP.L #TestPat,%D0 /* did it stick? */
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/* BEQ.S ram /* if equal, we have ram */
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/* MOVE.B #sRsrc_Video8,spID(%A0) /* if not, remove 8-bit table */
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/* BRA.S noram
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/*ram:
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/* MOVE.B #sRsrc_Video4,spID(%A0) /* remove 4-bit table if we have ram */
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/*noram:
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/* _sDeleteSRTRec */ /* remove the invalid entry */
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/* movel #SDeleteSRTRec,%d0
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/* _SlotManager
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/* BNE.S done /* */
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MOVE #2,seStatus(%A3) /* mark the change */
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done: ADDA #smParamBlockSize,%SP /* clean up */
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/* Clear video RAM to a nice gray */
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movel #0xAAAAAAAA,%D0 /* graypat1 := $AAAAAAAA */
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movel %D0,%D1
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NOT.L %D1
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MOVE.W #defScrnRow,%D4 /* sRow := defScrnRow {Bytes per pixel line} */
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MOVE.W #defmBounds_Bs-1,%D3 /* sHei := defScrnHeight {Screen Height in pixels} */
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movel %A2,%A1 /* init row pointer /* REPEAT */
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NxtRow: movel %A1,%A0 /* get next row */
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MOVE.W #defScrnRow/4-1,%D2 /* rowlongs := defScrnRow/4 - 1 {How many Longs there are} */
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NxtLong: movel %D0,(%A0)+ /* (%A0) := graypat(1/2) */
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DBF %D2,NxtLong /* UNTIL rowlongs < 0 */
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EXG %D0,%D1 /* graypat1 <-> graypat2 */
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ADD.W %D4,%A1 /* %A1 := %A1 + sRow */
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DBF %D3,NxtRow /* UNTIL sHei < 0 */
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/* Exit */
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Exit: RTS /* Return */
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/* <PUT YOUR VALUES FOR INIT TABLE, OTHER TABLES, ETC. HERE IF NEEDED> */
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/* END PrimaryInit */
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