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80 lines
2.9 KiB
Plaintext
80 lines
2.9 KiB
Plaintext
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; File: MMUEqu.a
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;
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; Contains: Equates relevant to the MMUs available in Macintoshes.
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;
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; Written by: Bob Herold
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;
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; Copyright: © 1988-1991, 1993 by Apple Computer, Inc., all rights reserved.
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;
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; Change History (most recent first):
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;
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; <SM2> 2/5/93 SAM Added EMMU type for emulated MMUs.
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; <7> 12/31/91 RB Added writeProtectBit equate.
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; <6> 1/30/91 gbm sab, #38: Change the ‘already including this file’ variable to
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; all uppercase (for security reasons)
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; <4> 2/20/90 CCH Added theSRP field to MMUConfigInfo record.
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; <3> 1/5/90 BG Clarification comments added to the *MMUConfigInfo* record
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; header and definitions.
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; <2> 1/2/90 BG First pass at cleaning this up to deal with 68040 MMUs. More is
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; needed.
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; <1.1> 5/14/89 rwh added descrTypeMask. Apologies to all.
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; <1.0> 5/13/89 rwh new today
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IF &TYPE('__INCLUDINGMMUEQU__') = 'UNDEFINED' THEN
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__INCLUDINGMMUEQU__ SET 1
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;-------------
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; MMU Modes
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;-------------
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;false32b EQU 0 ; 24 bit mode
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;true32b EQU 1 ; 32 bit mode
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;-----
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; MMU Configuration Info record
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;-----
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; NOTE - this does not work well with the 68040, as it has FOUR Transparent Translation <3>
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; registers: ITTO, ITT1, DTT0 and DTT1. Also, 'theCRP' is not 64 bits; in fact, <3>
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; there is no CRP register on the 040. Instead, it and the SRP are replaced by <3>
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; the SRP and URP (both 32 bits wide). The TC register is only 16 bits wide on <3>
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; the 040. "This needs to be fixed." <3>
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MMUConfigInfo RECORD 0 ; MMU configuration info
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theCRP ds.l 1 ; start of the 64-bit CRP on 020/030's <4>
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theSRP ds.l 1 ; start of the 32-bit SRP on 040's <4>
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theTC ds.l 1 ; the TC (Translation Control Register) value
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; (the lsw contains the TC on a 68040) <3>
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theTT0 ds.l 1 ; the {I}TT0 (Transparent Translation Reg 0) value
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theTT1 ds.l 1 ; the {I}TT1 (Transparent Translation Reg 1) value
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MMUInfoSize equ *-MMUConfigInfo ; size of an MMU info record
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ENDR
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;-----
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; Possible MMU Types
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;-----
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NoMMU equ 0 ; No MMU chip present
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HMMU equ 1 ; fake 24-bit mapper (in Mac II only)
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MMB equ 2 ; --- no longer supported
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PMMU851 equ 3 ; 68851 Paged Memory Management Unit (in Mac II only)
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PMMU030 equ 4 ; 68030 built-in Paged Memory Management Unit
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PMMU040 equ 5 ; 68040 built-in MMU <2>
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EMMU1 equ 6 ; Emulated MMU Type 1 (Risc Emulator Based Systems) <SM2>
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;-----
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; MMU Table equates
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;-----
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writeProtectBit equ 2 ; write protect bit in table entries <7> rb
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descrPage equ $01 ; page descriptor type *** move these to MMUequ.a ***
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descrTbl4 equ $02 ; short table type
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descrTbl8 equ $03 ; long table type
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descrTypeMask equ $03 ; mask to get type field
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LongStat equ $FC00 ; status field for long table descriptors
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LowLim equ $7FFF ; default lowest limit for long descriptors
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ENDIF ; ...already included
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