*-----------------------------------------------------------
Title[DMesaRastMiscDisp.mc...June 13, 1986 4:50:08 pm PDT...Rumph];
* Dispatch tables for all MISC opcodes, and definitions of undefined MISC opcodes.
*-----------------------------------------------------------

%
There are 400B MISC opcodes, divided into 20B groups of 20B each.

The entry point for each MISC opcode is declared by including the clause
	MiscTable[xxx]
in the first microinstruction of the code implementing opcode xxx.

Upon entry, T contains TOS (if there is one) and StkP has been advanced
in preparation for pushing a result.  Routines that do not push a result
must decrement StkP.  Exit is via the usual IFUNextN.

All unimplemented MISC opcodes cause a trap to occur.  In Alto mode,
a KFCB[sUnimplemented] is executed.  (Exception: floating point opcodes trap
by putting the offending opcode in OTPReg and executing a KFCB[137B].)

In PrincOps mode, a Cedar opcode trap is executed if an OpTrapTable has been
set up; otherwise a standard PrincOps TrapZero[sUnimplemented] is executed.
(See DMesaFaults.mc for more details.)  The microcode implementing a MISC
opcode may conditionally trap (e.g., for illegal arguments) by branching
to OpcodeTrap.

Adding or removing MISC opcodes requires changing the dispatch tables.
This is why these tables are in a separate file, which may be renamed and
edited when non-standard MISC opcodes are introduced.

To add a new MISC opcode to an existing group, delete the statement
	MiscOpcodeUnimplemented[xxx];
below, and add the corresponding
	MiscTable[xxx]
in the appropriate source file.

To add a new group of MISC opcodes, change
	MiscGroupUnimplemented[xxx];
to:	MiscGroupImplemented[xxx];
below, where xxx is the first opcode of the group (i.e., a multiple of 20B).
Then, for each opcode in the group NOT being defined, add the statement
	MiscOpcodeUnimplemented[xxx];

Note: the MiscOpcodeUnimplemented[xxx] statments may appear either below or in
another source file.  They appear below when the unimplemented opcodes in
a group are unrelated, but in a separate source file when they are related to
other opcodes that are implemented in that source file.
%

TopLevel;
Set[XTask, IP[EMU]];

*-----------------------------------------------------------
* First-level (group) dispatch table:
*-----------------------------------------------------------

M[MiscGroupImplemented,
  (T_ StackNoUfl&+1, BranchExternal[Or[
    Select[RShift[#1, 6], MT0Loc, MT1Loc, MT2Loc, MT3Loc],
    1]])];
M[MiscGroupUnimplemented, (Branch[Misc377])];

MiscDispatch: DispTable[20],
	MiscGroupImplemented[000];		* Miscellaneous operations
	MiscGroupImplemented[020];		* Floating point
	MiscGroupUnimplemented[040];
:If[AltoMode];		********** Alto version **********
	MiscGroupUnimplemented[060];
:Else;			******** PrincOps version ********
	MiscGroupImplemented[060];		* Cedar allocator/GC
:EndIf;			**********************************
	MiscGroupImplemented[100];		* More miscellaneous operations
	MiscGroupUnimplemented[120];
:If[AltoMode];		********** Alto version **********
	MiscGroupUnimplemented[140];
:Else;			******** PrincOps version ********
	MiscGroupImplemented[140];		* Cedar 5.0 reference-counting opcodes
:EndIf;			**********************************
	MiscGroupUnimplemented[160];
	MiscGroupUnimplemented[200];
	MiscGroupUnimplemented[220];
	MiscGroupImplemented[240];		* Dorado-only operations
	MiscGroupUnimplemented[260];
	MiscGroupUnimplemented[300];
	MiscGroupUnimplemented[320];
	MiscGroupUnimplemented[340];
	MiscGroupUnimplemented[360];

*-----------------------------------------------------------
* Unimplemented MISC opcodes:
*-----------------------------------------------------------

:If[AltoMode];		********** Alto version **********
	MiscOpcodeUnimplemented[002];	* Read RAM
	MiscOpcodeUnimplemented[004];	* IO reset
	MiscOpcodeUnimplemented[010];	* Set maintenance panel
	MiscOpcodeUnimplemented[014];	* XferL
	MiscOpcodeUnimplemented[015];	* TextBlt

	MiscOpcodeUnimplemented[244];
	MiscOpcodeUnimplemented[245];
	MiscOpcodeUnimplemented[247];	* ResetEther
	MiscOpcodeUnimplemented[250];	* Boot
	MiscOpcodeUnimplemented[254];	* ResetDisk
	MiscOpcodeUnimplemented[255];	* SetIntervalTimer

:Else;			******** PrincOps version ********
	MiscOpcodeUnimplemented[002];	* Read RAM
	MiscOpcodeUnimplemented[004];	* IO reset
	MiscOpcodeUnimplemented[014];	* XferL
	MiscOpcodeUnimplemented[015];	* TextBlt
	MiscOpcodeUnimplemented[017];	* Set default partition

	MiscOpcodeUnimplemented[244];
*	MiscOpcodeUnimplemented[245];  * Start "Monterey" Raster controller line task
	MiscOpcodeUnimplemented[250];	* Boot (obsolete)
:EndIf;			**********************************

	MiscOpcodeUnimplemented[101];
	MiscOpcodeUnimplemented[103];
	MiscOpcodeUnimplemented[105];
	MiscOpcodeUnimplemented[106];
	MiscOpcodeUnimplemented[107];
	MiscOpcodeUnimplemented[110];
	MiscOpcodeUnimplemented[111];
	MiscOpcodeUnimplemented[112];
	MiscOpcodeUnimplemented[113];
	MiscOpcodeUnimplemented[114];
	MiscOpcodeUnimplemented[115];
	MiscOpcodeUnimplemented[116];
	MiscOpcodeUnimplemented[117];


* Special entry to squash pending dispatch when an entire
* group is unimplemented.
Misc377:
	MiscOpcodeUnimplemented[377];


* This doesn't really belong here, but...
* Cedar opcodes no longer defined in Alto/Mesa system:
:If[AltoMode];		********** Alto version **********
UndefOp[MOpASSIGNREF];
UndefOp[MOpASSIGNREFNEW];
:EndIf;			**********************************