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- ;======================================================================
- ;
- ; SetCPU V1.4
- ; by Dave Haynie (released to the public domain)
- ;
- ; 68030 Assembly Function Module
- ;
- ; This module contains functions that access functions in the 68020,
- ; 68030, and 68851 chips, and ID all of these, plus the 68881/68882
- ; FPU chips.
- ;
- ;======================================================================
-
- ;======================================================================
- ;
- ; Macros & constants used herein...
- ;
- ;======================================================================
-
- CALLSYS macro *
- jsr LVO\1(A6)
- endm
-
- CIB_ENABLE EQU 0
- CIB_FREEZE EQU 1
- CIB_ENTRY EQU 2
- CIB_CLEAR EQU 3
- CIB_BURST EQU 4
-
- CDB_ENABLE EQU 8
- CDB_FREEZE EQU 9
- CDB_ENTRY EQU 10
- CDB_CLEAR EQU 11
- CDB_BURST EQU 12
- CDB_WALLOC EQU 13
-
- AFB_68030 EQU 2
-
- ATNFLGS EQU $129
-
- LVOSupervisor EQU -30
- LVOFindTask EQU -294
- LVOAllocTrap EQU -342
- LVOFreeTrap EQU -348
-
- ;======================================================================
- ;
- ; Need just a little more stuff
- ;
- ;======================================================================
-
- NOLIST
- include "exec/execbase.i"
- include "exec/tasks.i"
- LIST
-
- machine mc68020
- mc68881
- cseg
-
- ;**********************************************************************
- ;
- ; This section contains functions that identify and operate on CPU
- ; things.
- ;
- ;**********************************************************************
-
- public _GetCPUType ; ID the CPU
- public _GetCACR ; Get 020/030 CACR register
- public _SetCACR ; Set 020/030 CACR register
-
- ;======================================================================
- ;
- ; This function returns the type of the CPU in the system as a
- ; longword: 68000, 68010, 68020, or 68030. The testing must be done
- ; in reverse order, in that any higher CPU also has the bits set for
- ; a lower CPU. Also, since 1.3 doesn't recognize the 68030, if I
- ; find the 68020 bit set, I always check for the presence of a
- ; 68030.
- ;
- ; This routine should be the first test routine called under 1.2
- ; and 1.3.
- ;
- ; ULONG GetCPUType();
- ;
- ;======================================================================
-
- _GetCPUType:
- movem.l a4/a5,-(sp) ; Save this register
- move.l 4,a6 ; Get ExecBase
- btst.b #AFB_68030,ATNFLGS(a6) ; Does the OS think an '030 is here?
- beq 0$
- move.l #68030,d0 ; Sure does...
- movem.l (sp)+,a4/a5
- rts
- 0$
- btst.b #AFB_68020,ATNFLGS(a6) ; Maybe a 68020
- bne 2$
- btst.b #AFB_68010,ATNFLGS(a6) ; Maybe a 68010?
- bne 1$
- move.l #68000,d0 ; Just a measley '000
- movem.l (sp)+,a4/a5
- rts
- 1$
- move.l #68010,d0 ; Yup, we're an '010
- movem.l (sp)+,a4/a5
- rts
- 2$
- move.l #68020,d0 ; Assume we're an '020
- lea 3$,a5 ; Get the start of the supervisor code
- CALLSYS Supervisor
- movem.l (sp)+,a4/a5
- rts
- 3$
- movec cacr,d1 ; Get the cache register
- move.l d1,a4 ; Save it for a minute
- bset.l #CIB_BURST,d1 ; Set the inst burst bit
- bclr.l #CIB_ENABLE,d1 ; Clear the inst cache bit
- movec d1,cacr ; Try to set the CACR
- movec cacr,d1
- btst.l #CIB_BURST,d1 ; Do we have a set burst bit?
- beq 4$
- move.l #68030,d0 ; It's a 68030
- bset.b #AFB_68030,ATNFLGS(a6)
- 4$
- move.l a4,d1 ; Restore the original CACR
- movec d1,cacr
- rte
-
- ;======================================================================
- ;
- ; This function returns the 68020/68030 CACR register. It assumes
- ; a 68020 or 68030 based system.
- ;
- ; ULONG GetCACR()
- ;
- ;======================================================================
-
- _GetCACR:
- move.l 4,a6 ; Get ExecBase
- btst.b #AFB_68020,ATNFLGS(a6) ; Does the OS think an '020 is here?
- bne 1$
- moveq.l #0,d0 ; No CACR here, pal
- rts
- 1$
- move.l a5,-(sp) ; Save this register
- lea 2$,a5 ; Get the start of the supervisor code
- CALLSYS Supervisor
- move.l (sp)+,a5 ; Give back registers
- rts
- 2$
- movec cacr,d0 ; Make CACR the return value
- rte
-
- ;======================================================================
- ;
- ; This function sets the value of the 68020/68030 CACR register.
- ; It assumes a 68020 or 68030 based system.
- ;
- ; void SetCACR(cacr)
- ; ULONG cacr;
- ;
- ;======================================================================
-
- _SetCACR:
- move.l 4(sp),d0 ; New CACR is on stack
- move.l 4,a6 ; Get ExecBase
- btst.b #AFB_68020,ATNFLGS(a6) ; Does the OS think an '020 is here?
- bne 1$
- rts ; No CACR here, pal
- 1$
- move.l a5,-(sp) ; Save this register
- lea 2$,a5 ; Get the start of the supervisor code
- CALLSYS Supervisor
- move.l (sp)+,a5 ; Give back register
- rts
- 2$
- movec d0,cacr ; Set the CACR
- rte
-
- ;**********************************************************************
- ;
- ; This section contains functions that identify and operate on
- ; MMU things. Unfortunately, there aren't any MMU op-codes in
- ; the Manx assembler yet, so I have to fudge them here.
- ;
- ;**********************************************************************
-
- public _GetMMUType ; Returns the type of MMU
- public _GetCRP ; Gets MMU CRP register
- public _SetCRP ; Sets MMU CRP register
- public _GetTC ; Gets MMU TC register
- public _SetTC ; Gets MMU TC register
-
- ;======================================================================
- ;
- ; This function returns 0L if the system contains no MMU,
- ; 68851L if the system does contain an 68851, or 68030L if the
- ; system contains a 68030.
- ;
- ; This routine seems to lock up on at least some CSA 68020
- ; boards, though it runs just fine on those from Ronin and
- ; Commodore, as well as all 68030 boards it's been tested on.
- ;
- ; ULONG GetMMUType()
- ;
- ;======================================================================
-
- _GetMMUType:
- move.l 4,a6 ; Get ExecBase
- movem.l a3/a4/a5,-(sp) ; Save this stuff
- move.l #0,a1
- CALLSYS FindTask ; Call FindTask(0L)
- move.l d0,a3
-
- move.l TC_TRAPCODE(a3),a4 ; Change the exception vector
- move.l #2$,TC_TRAPCODE(a3)
-
- subq.l #4,sp ; Let's try an MMU instruction
- dc.w $f017 ; Slimey PMOVE tc,(sp)
- dc.w $4200
- cmpi #0,d0 ; Any MMU here?
- beq 1$
- btst.b #AFB_68030,ATNFLGS(a6) ; Does the OS think an '030 is here?
- beq 1$
- move.l #68030,d0
-
- 1$
- addq.l #4,sp ; Return that local
- move.l a4,TC_TRAPCODE(a3) ; Reset exception stuff
- movem.l (sp)+,a3/a4/a5 ; and return the registers
- rts
-
- ; This is the exception code. No matter what machine we're on,
- ; we get an exception. If the MMU's in place, we should get a
- ; privilige violation; if not, an F-Line emulation exception.
- 2$
- move.l (sp)+,d0 ; Get Amiga supplied exception #
- cmpi #11,d0 ; Is it an F-Line?
- beq 3$ ; If so, go to the fail routine
- move.l #68851,d0 ; We have MMU
- addq.l #4,2(sp) ; Skip the MMU instruction
- rte
- 3$
- moveq.l #0,d0 ; It dinna woik,
- addq.l #4,2(sp) ; Skip the MMU instruction
- rte
-
- ;======================================================================
- ;
- ; This function returns the MMU CRP register. It assumes a 68020
- ; system with MMU, or a 68030 based system (eg, test for MMU before
- ; you call this, or you wind up in The Guru Zone). Note that the
- ; CRP register is two longwords long.
- ;
- ; void GetCRP(ULONG *)
- ;
- ;======================================================================
-
- _GetCRP:
- move.l 4(sp),a0 ; Pointer to the CRP storage area
- move.l 4,a6 ; Get ExecBase
- move.l a5,-(sp)
- lea 2$,a5 ; Get the start of the supervisor code
- CALLSYS Supervisor
- move.l (sp)+,a5
- rts
- 2$
- dc.w $f010 ; PMOVE CRP,(a0)
- dc.w $4e00
- rte
-
- ;======================================================================
- ;
- ; This function sets the MMU CRP register. It assumes a 68020
- ; system with MMU, or a 68030 based system (eg, test for MMU before
- ; you call this, or you wind up in The Guru Zone). Note that the
- ; CRP register is two longwords long.
- ;
- ; void SetCRP(ULONG *)
- ;
- ;======================================================================
-
- _SetCRP:
- move.l 4(sp),a0 ; Pointer to the CRP storage area
- move.l 4,a6 ; Get ExecBase
- move.l a5,-(sp)
- lea 2$,a5 ; Get the start of the supervisor code
- CALLSYS Supervisor
- move.l (sp)+,a5 ; Give back registers
- rts
- 2$
- dc.w $f010 ; PMOVE (a0),CRP
- dc.w $4c00
- rte
-
- ;======================================================================
- ;
- ; This function returns the MMU TC register. It assumes a 68020
- ; system with MMU, or a 68030 based system (eg, test for MMU before
- ; you call this, or you wind up in The Guru Zone).
- ;
- ; ULONG GetTC()
- ;
- ;======================================================================
-
- _GetTC:
- move.l 4,a6 ; Get ExecBase
- move.l a5,-(sp)
- subq.l #4,sp ; Make a place to dump TC
- move.l sp,a0
- lea 2$,a5 ; Get the start of the supervisor code
- CALLSYS Supervisor
- move.l (sp),d0 ; Here's the result
- addq.l #4,sp
- move.l (sp)+,a5
- rts
- 2$
- dc.w $f010 ; PMOVE TC,(a0)
- dc.w $4200
- rte
-
- ;======================================================================
- ;
- ; This function sets the MMU TC register. It assumes a 68020
- ; system with MMU, or a 68030 based system (eg, test for MMU before
- ; you call this, or you wind up in The Guru Zone).
- ;
- ; void SetTC(ULONG)
- ;
- ;======================================================================
-
- _SetTC:
- lea 4(sp),a0 ; Get address of our new TC value
- move.l 4,a6 ; Get ExecBase
- move.l a5,-(sp)
- lea 2$,a5 ; Get the start of the supervisor code
- CALLSYS Supervisor
- move.l (sp)+,a5
- rts
- 2$
- dc.w $f010 ; PMOVE (a0),TC
- dc.w $4000
- rte
-
-
- ;**********************************************************************
- ;
- ; This section contains functions that identify and operate on
- ; FPU things.
- ;
- ;**********************************************************************
-
- public _GetFPUType ; Gets the FPU type
-
- ;======================================================================
- ;
- ; This function returns the type of the FPU in the system as a
- ; longword: 0 (no FPU), 68881, or 68882.
- ;
- ; ULONG GetFPUType();
- ;
- ;======================================================================
-
- _GetFPUType:
- move.l a5,-(sp) ; Save this register
- move.l 4,a6 ; Get ExecBase
- btst.b #AFB_68881,ATNFLGS(a6) ; Does the OS think an FPU is here?
- bne 1$
- moveq.l #0,d0 ; No FPU here, dude
- move.l (sp)+,a5 ; Give back the register
- rts
- 1$
- lea 2$,a5 ; Get the start of the supervisor code
- CALLSYS Supervisor
- move.l (sp)+,a5 ; Give back registers
- rts
- 2$
- move.l #68881,d0 ; Assume we're a 68881
- fsave -(sp) ; Test and check
- moveq.l #0,d1
- move.b 1(sp),d1 ; Size of this frame
- cmpi #$18,d1
- beq 3$
- move.l #68882,d0 ; It's a 68882
- 3$
- frestore (sp)+ ; Restore the stack
- rte
-
- end
-