-/* ConfigDev passed in a3 */
-/*
-struct ConfigDev {
- struct Node cd_Node; // 0 2ptr,2byte,1ptr = 14byte
- UBYTE cd_Flags; // 14
- UBYTE cd_Pad; // 15
- struct ExpansionRom cd_Rom; // 16 16bytes
- APTR cd_BoardAddr; // 32
- ...
-*/
-.set SysBase,4
-.set OpenLibrary,-552
-.set CloseLibrary,-414
-.set PutStr,-948
-.set VPrintf,-954
-.set AllocMem,-198
-.set FindResident,-96
-
-start:
- jmp realstart(pc)
- handover:
- jmp trampoline(pc)
-
-.align 4
-realstart:
- movea.l SysBase,a6 /* allocate RAM for loading ourselves to */
- move.l #0x40000,d0
- moveq #0,d1 /* MEMF_ANY */
- jsr AllocMem(a6)
- tst.l d0
- beq allocfail
-
- move.l d0, a4 /* load addr */
-
- move.l (a7)+,a3 /* restore configdev address from stack */
- jmp 0x24(a4) /* jmp to handover at new memory location (0x20+0x04) */
-
-.align 4
-allocfail:
- move.l d1,0xdff180
- add.l #1,d1
- bra allocfail
-
-/* we will arrive here in our copy in amiga RAM */
-/* a0 contains board addr, a3 contains configdev addr */
-.align 4
-trampoline:
- lea configdev(pc),a1
- move.l a3,(a1) /* store configdev pointer */
-
- move.l a4, a0 /* board addr not needed anymore, keep loadaddr in a0 */
-
- /* add resident ---------------------- */
-
- /* mntsd.device is at loadaddr + 0x400 (skip 2 blocks) */
- move.l a0,-(a7)
- add.l #0x400, a0
- /* relocate the binary (hunk) */
- jsr relocstart(pc)
- move.l (a7)+, a0 /* address of loaded mntsd.device */
- move.l a0, a4
- move.l a4, a1 /* restore board addr */
-
- add.l #0x400+0x180, a1 /* start of mntsd.device + $180 = romtag FIXME */
- move.l #0, d1 /* no seglist */
- move.l 4,a6
- jsr -102(a6) /* InitResident */
- /* object = InitResident(resident, segList) */
- /* D0 A1 D1 */
-
- /* make dos node --------------------- */
-
- jmp initdos(pc)
-
-.align 4
-configdev:
- .long 0
-
-segtprs:
- .long 0
- .long 0
-
- .align 4
- relocstart:
- lea.l segptrs(pc), a1
-
- move.l 8(a0), d4 /* number of hunks */
- move.l #0, d5
-
- /*
- a0: executable base addr
- a1: segptrs
- a2: addr of hunk0
-
- d4: numhunks
- d5: pass#
- d6: current hunk addr
- */
-
- /* hunk 0 address in memory */
- move.l a0, d6
- add.l #0x24, d6
- move.l d6, a2 /* addr of first hunk */
- move.l d6, (a1) /* store pointer to this hunk in segptrs[1] */
-
-relocpass:
- move.l a2, a3
- move.l 0x14(a0), d0 /* ptr to first hunk size */
-
- lsl.l #2, d0 /* firsthunk + first size */
- add.l d0, a3 /* end of first hunk, start of reloc table */
-
- jsr reloctables(pc)
-
- add.l #4, a3 /* skip hunk_end */
- add.l #4, a3 /* skip hunk_data */
- move.l (a3)+, d0 /* size of data hunk */
- lsl.l #2, d0
-
- move.l a3, 4(a1) /* store pointer to this hunk in segptrs[1] */
- move.l a3, d6 /* save current hunk ptr for patching CHECKME */
- add.l d0, a3 /* arrive at reloc tables of data hunk */
-
- jsr reloctables(pc)
-
- cmp #1, d5
- bge rcomplete
-
- /* start pass 1 */
- move.l #1, d5
- move.l a2, d6 /* addr of first hunk */
- bra relocpass
-
-rcomplete:
- rts
-
-.align 4
-reloctables:
- move.l (a3)+, d2 /* skip 0000 03ec marker */
- reloctable:
- move.l (a3)+, d2 /* number of relocs to process */
-
- tst.w d2
- beq relocdone /* done if zero */
-
- move.l (a3)+, d1 /* segment number to point to */
-
- lsl.l #2, d1
- move.l (a1,d1), d1 /* offset to add to target slots */
-
- bra rloop
-relocloop:
- move.l (a3)+, a4
-
- tst.w d5 /* pass = 0? */
- beq rloop
-
- /* pass = 1, so patch */
- add.l d6, a4 /* add current hunk address */
- add.l d1, (a4) /* the actual patching */
-
- move.l d1, 0xdff180
- rloop:
- dbra d2, relocloop
- jmp reloctable(pc)
- relocdone:
- rts
-
-.align 4
-initdos:
- move.l 4,a6
- lea expansionname(pc),a1
-
- moveq #37, d0
- jsr OpenLibrary(a6) /* open expansion.library */
- tst.l d0
- beq.s nodos
- move.l d0,a6
-
- /*movem.l a0-a6/d0-d6,-(a7)
- move.l #0xbeef,d2
- lea.l fmtdebug(pc),a1
- jsr printf(pc)
- movem.l (a7)+,a0-a6/d0-d6*/
-
- lea dosnode(pc),a0
- lea diskname(pc),a1
- move.l a1,(a0) /* store in parmpkt */
- lea devicename(pc),a1
- move.l a1,4(a0) /* store in parmpkt */
-
- jsr -144(a6) /* MakeDosNode */
- move.l d0, a0 /* fresh device node */
-
- /* add boot node --------------------- */
-
- move.l #0, d0
- move.l #0, d1
- move.l configdev(pc),a1
- /*move.l #0, a1*/ /* later put ConfigDev here (a3) */
- jsr -36(a6) /* AddBootNode */
-
- move.l a6,a1 /* close expansion library */
- move.l 4,a6
- jsr CloseLibrary(a6)
- moveq #1,d0
- move.l (a7)+,a6
- rts
-
-nodos:
- move.l d1,0xdff180
- add.l #1,d1
- bra nodos
-
- moveq #1,d0
- move.l (a7)+,a6
- rts
-
-.align 4
-diskname:
- .asciz "PDH0"
- .align 4
-devicename:
- .asciz "pi-scsi.device"
- .align 4
-expansionname:
- .asciz "expansion.library"
- .align 4
-dosnode:
- .long 0 /* dos disk name */
- .long 0 /* device file name */
- .long 0 /* unit */
- .long 0 /* flags */
- .long 16 /* length of node? */
- .long 128 /* longs in a block */
- .long 0
- .long 4 /* surfaces */
- .long 1 /* sectors per block */
- .long 256 /* blocks per track */
- .long 2 /* reserved bootblocks 256 = 128KB */
- .long 0
- .long 0
- .long 2 /* lowcyl FIXME */
- /*.long 2047*/ /* hicyl */
- .long 1023
- .long 10 /* buffers */
- .long 0 /* MEMF_ANY */
- .long 0x0001fe00 /* MAXTRANS */
- .long 0x7ffffffe /* Mask */
- .long -1 /* boot prio */
- .long 0x444f5303 /* dostype: DOS3 */
+**
+** Sample autoboot code fragment
+**
+** These are the calling conventions for the Diag routine
+**
+** A7 -- points to at least 2K of stack
+** A6 -- ExecBase
+** A5 -- ExpansionBase
+** A3 -- your board's ConfigDev structure
+** A2 -- Base of diag/init area that was copied
+** A0 -- Base of your board
+**
+** Your Diag routine should return a non-zero value in D0 for success.
+** If this value is NULL, then the diag/init area that was copied
+** will be returned to the free memory pool.
+**
+
+ INCLUDE "exec/types.i"
+ INCLUDE "exec/nodes.i"
+ INCLUDE "exec/resident.i"
+ INCLUDE "libraries/configvars.i"
+
+ ; LVO's resolved by linking with library amiga.lib
+ XREF _LVOFindResident
+
+ROMINFO EQU 0
+ROMOFFS EQU $0
+
+* ROMINFO defines whether you want the AUTOCONFIG information in
+* the beginning of your ROM (set to 0 if you instead have PALS
+* providing the AUTOCONFIG information instead)
+*
+* ROMOFFS is the offset from your board base where your ROMs appear.
+* Your ROMs might appear at offset 0 and contain your AUTOCONFIG
+* information in the high nibbles of the first $40 words ($80 bytes).
+* Or, your autoconfig ID information may be in a PAL, with your
+* ROMs possibly being addressed at some offset (for example $2000)
+* from your board base. This ROMOFFS constant will be used as an
+* additional offset from your configured board address when patching
+* structures which require absolute pointers to ROM code or data.
+
+*----- We'll store Version and Revision in serial number
+VERSION EQU 37 ; also the high word of serial number
+REVISION EQU 1 ; also the low word of serial number
+
+* See the Addison-Wesley Amiga Hardware Manual for more info.
+
+MANUF_ID EQU 2011 ; CBM assigned (2011 for hackers only)
+PRODUCT_ID EQU 1 ; Manufacturer picks product ID
+
+BOARDSIZE EQU $10000 ; How much address space board decodes
+SIZE_FLAG EQU 3 ; Autoconfig 3-bit flag for BOARDSIZE
+ ; 0=$800000(8meg) 4=$80000(512K)
+ ; 1=$10000(64K) 5=$100000(1meg)
+ ; 2=$20000(128K) 6=$200000(2meg)
+ ; 3=$40000(256K) 7=$400000(4meg)
+ CODE
+
+AllocMem EQU -198
+
+******* RomStart ***************************************************
+**********************************************************************
+
+RomStart:
+
+******* DiagStart **************************************************
+DiagStart: ; This is the DiagArea structure whose relative offset from
+ ; your board base appears as the Init Diag vector in your
+ ; autoconfig ID information. This structure is designed
+ ; to use all relative pointers (no patching needed).
+ dc.b DAC_WORDWIDE+DAC_CONFIGTIME ; da_Config
+ dc.b 0 ; da_Flags
+ dc.w $4000 ; da_Size
+ dc.w DiagEntry-DiagStart ; da_DiagPoint
+ dc.w BootEntry-DiagStart ; da_BootPoint
+ dc.w DevName-DiagStart ; da_Name
+ dc.w 0 ; da_Reserved01
+ dc.w 0 ; da_Reserved02
+
+******* Resident Structure *****************************************
+Romtag:
+ dc.w RTC_MATCHWORD ; UWORD RT_MATCHWORD
+rt_Match: dc.l Romtag-DiagStart ; APTR RT_MATCHTAG
+rt_End: dc.l EndCopy-DiagStart ; APTR RT_ENDSKIP
+ dc.b RTW_COLDSTART ; UBYTE RT_FLAGS
+ dc.b VERSION ; UBYTE RT_VERSION
+ dc.b NT_DEVICE ; UBYTE RT_TYPE
+ dc.b 20 ; BYTE RT_PRI
+rt_Name: dc.l DevName-DiagStart ; APTR RT_NAME
+rt_Id: dc.l IdString-DiagStart ; APTR RT_IDSTRING
+rt_Init: dc.l Init-RomStart ; APTR RT_INIT
+
+
+******* Strings referenced in Diag Copy area ************************
+DevName: dc.b '2nd.scsi.device',0 ; Name string
+IdString dc.b 'PISCSI ',48+VERSION,'.',48+REVISION ; Id string
+
+DosName: dc.b 'dos.library',0 ; DOS library name
+
+DosDevName: dc.b 'ABC',0 ; dos device name for MakeDosNode()
+ ; (dos device will be ABC:)
+
+ ds.w 0 ; word align
+
+******* DiagEntry **************************************************
+**********************************************************************
+*
+* success = DiagEntry(BoardBase,DiagCopy, configDev)
+* d0 a0 a2 a3
+*
+* Called by expansion architecture to relocate any pointers
+* in the copied diagnostic area. We will patch the romtag.
+* If you have pre-coded your MakeDosNode packet, BootNode,
+* or device initialization structures, they would also need
+* to be within this copy area, and patched by this routine.
+*
+**********************************************************************
+
+DiagEntry:
+ nop
+ nop
+ nop
+ move.l #1,$80000020
+
+ movea.l 4,a6
+ move.l #$40000,d0
+ moveq #0,d1
+ jsr AllocMem(a6)
+
+ nop
+ nop
+ move.l d0,$80000040
+
+ move.l d0,a1
+ move.l #0,d1
+ movea.l 4,a6
+ add.l #$16e,a1
+ nop
+ nop
+ nop
+ jsr -102(a6)
+ nop
+ nop
+ bra.s endpatches
+
+
+ lea patchTable-RomStart(a0),a1 ; find patch table
+ adda.l #ROMOFFS,a1 ; adjusting for ROMOFFS
+
+* Patch relative pointers to labels within DiagCopy area
+* by adding Diag RAM copy address. These pointers were coded as
+* long relative offsets from base of the DiagArea structure.
+*
+dpatches:
+ move.l a2,d1 ;d1=base of ram Diag copy
+dloop:
+ move.w (a1)+,d0 ;d0=word offs. into Diag needing patch
+ bmi.s bpatches ;-1 is end of word patch offset table
+ add.l d1,0(a2,d0.w) ;add DiagCopy addr to coded rel. offset
+ bra.s dloop
+
+* Patches relative pointers to labels within the ROM by adding
+* the board base address + ROMOFFS. These pointers were coded as
+* long relative offsets from RomStart.
+*
+bpatches:
+ move.l a0,d1 ;d1 = board base address
+ add.l #ROMOFFS,d1 ;add offset to where your ROMs are
+rloop:
+ move.w (a1)+,d0 ;d0=word offs. into Diag needing patch
+ bmi.s endpatches ;-1 is end of patch offset table
+ add.l d1,0(a2,d0.w) ;add ROM address to coded relative offset
+ bra.s rloop
+
+endpatches:
+ moveq.l #1,d0 ; indicate "success"
+ rts
+
+
+******* BootEntry **************************************************
+**********************************************************************
+
+BootEntry: lea DosName(PC),a1 ; 'dos.library',0
+ jsr _LVOFindResident(a6) ; find the DOS resident tag
+ move.l d0,a0 ; in order to bootstrap
+ move.l RT_INIT(A0),a0 ; set vector to DOS INIT
+ jsr (a0) ; and initialize DOS
+ rts
+
+*
+* End of the Diag copy area which is copied to RAM
+*
+EndCopy:
+*************************************************************************
+
+*************************************************************************
+*
+* Beginning of ROM driver code and data that is accessed only in
+* the ROM space. This must all be position-independent.
+*
+
+patchTable:
+* Word offsets into Diag area where pointers need Diag copy address added
+ dc.w rt_Match-DiagStart
+ dc.w rt_End-DiagStart
+ dc.w rt_Name-DiagStart
+ dc.w rt_Id-DiagStart
+ dc.w -1
+
+* Word offsets into Diag area where pointers need boardbase+ROMOFFS added
+ dc.w rt_Init-DiagStart
+ dc.w -1
+
+******* Romtag InitEntry **********************************************
+*************************************************************************
+
+Init: ; After Diag patching, our romtag will point to this
+ ; routine in ROM so that it can be called at Resident
+ ; initialization time.
+ ; This routine will be similar to a normal expansion device
+ ; initialization routine, but will MakeDosNode then set up a
+ ; BootNode, and Enqueue() on eb_MountList.
+ ;
+ rts
+
+ ; Rest of your position-independent device code goes here.
+
+ END
projects / pistorm / blobdiff