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Resource forks are included only for .rsrc files. These are DeRezzed into their data fork. 'ckid' resources, from the Projector VCS, are not included. The Tools directory, containing mostly junk, is also excluded.
217 lines
8.9 KiB
Plaintext
217 lines
8.9 KiB
Plaintext
;
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; File: ROvr.a
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;
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; Contains: ROM resource override code -- 'ROvr' (0)
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;
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; Written by: Brian B. McGhie and Darin Adler
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;
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; Copyright: © 1986-1992 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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; <SM1> 4/23/92 CS Apply changes from reality:
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; <8> 3/16/92 DTY #1024511:
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; #1024511: Move ROZ cutback code back to ResourceMgrPatches.a
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; <7> 3/4/91 dba dty: get rid of SysVers conditionals
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; <6> 2/8/91 dba dty, #66370: reverting back to the old algorithm for finding
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; ROv# resources; why did I ever change it?
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; <5> 7/30/90 stb NEEDED FOR SIXPACK: replace ROZ cutback with another version
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; <4> 6/29/90 DDG NEEDED FOR SIXPACK: Now if hasSwitchLaunchPrevention is true,
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; the header is version seven and if it is false, the header is
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; version three (the old version number).
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; <3> 6/26/90 CCH NEEDED FOR SIXPACK: Added code to cutback size of ROM resource
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; map by about 5k on $67c ROM-based machines.
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; <2> 6/6/90 DTY Added a check to the ROM Override to determine if the system is
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; in the process of switch-launching from an older system to
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; System 7.0. If so, install a patch on _InitFonts to prevent this
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; switch launch from completing, and revert back to the previous
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; System file. Added additional check for value of SysVersion to
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; allow network booting to work.
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; <1.1> 8/30/89 dba changed to find ROv# resources by ID instead of by embedded
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; version number; rewrote to fix bug with resources not in ROM
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; (use one-deep calls)
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; <1.0> 11/16/88 CCH Added to EASE.
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;
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; 'ROvr' is the resource that the Resource Mgr looks for when loading in a new
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; System file. 'ROv#' is a resource type that contains which resources
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; in the ROM to override. The structure for 'ROv#' is as follows:
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;
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; 'ROv#':
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; version dc.w $0075 ; ROM version (ignored)
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; count dc.w $00XX ; # of resources in list minus one
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; type.0 dc.l 'WDEF' ; resource type to override
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; id.0 dc.w $0000 ; resource ID
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; type.1 dc.l 'PACK' ; resource type to override
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; id.1 dc.w $0004 ; resource ID
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; ...
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; type.XX dc.l 'CURS' ; resource type to override
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; id.XX dc.w $0002 ; resource ID
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;
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; NOTE: Previous versions of ROvr cycled through all of the 'ROv#' resources
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; and obeyed any which had the proper ROM version. This version looks only at
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; the 'ROv#' with the ROM version as its ID, and ignores the embedded version.
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;
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; The first instruction in 'ROvr' should be a bra.s past the version word
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; of 'ROvr'. This will enable install programs to determine if you have
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; the latest 'ROvr' resource, and replace it with a newer one.
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load 'StandardEqu.d'
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include 'ResourceMgrPriv.a'
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macro
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ResourceVersionHeader &type,&id,&version
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bra.s @skipHeader
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dc.l (&type)
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dc.w (&id)
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dc.w (&version)
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@skipHeader:
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endm
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kBranchSize equ 2 ; Size of short branch instruction in bytes
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kMinSystem equ $0700 ; Minimum System version to allow switch launching from
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kpatchType equ 'proc' ; _InitFonts patch is in a 'proc' resource
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kpatchID equ -16495 ; Resource ID of patch
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kInitFontsTrap equ $FE ; Trap word of _InitFonts
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ROvr main
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ResourceVersionHeader 'ROvr',0,8 ; The Big Bang ROvr (more patches for your bucks!)
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tst.w SysVersion ; At boot, SysVersion is not initialised, so we need a special
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beq.s DoOverrides ; case to allow normal ROM overriding at boot.
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cmpi.w #kMinSystem,SysVersion ; If SysVersion is System 7.0 or greater, allow switch launching.
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bge.s DoOverrides ; (Network booting)
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; If SysVersion was initialized, then weÕre being called during a switch launch.
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; Since we donÕt want to allow this switch launch to finish, we need to go back to the previously running
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; system. In the switch launch code for Finder 6.x, _InitResources is called, then _InitFonts, then the working
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; directory reference number of the new System Folder is saved in BootDrive.
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; Now that weÕve determined that we donÕt want to switch launch, put a patch on _InitFonts which will close the
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; System 7 (or newer) System file, re-open the old one, and rebuild the System resource map. The patch also
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; bumps the return address past the instructions that stash the new WDRefNum in BootDrive, since up to this
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; point, BootDrive still contains the WDRefNum of the previous System Folder. This fact makes life incredibly
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; simple, and no hocus pocus has to be performed to figure out where the last System file was.
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; The patch is in 'proc' -16495.
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sub.w #4,sp
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move.l #kPatchType,-(sp)
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move.w #kPatchID,-(sp)
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_GetResource ; Get a handle to our patch
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tst.l (a1)
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bne.s PatchInitFonts ; If the handle we got back was good, install the patch
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moveq #dsBadPatch,d0 ; Generate a System Error if _GetResource returned nil
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_SysError
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PatchInitFonts
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move.l (sp),a1
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_DetachResource ; Detach it so itÕll stick around
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move.w #kInitFontsTrap,d0
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_GetTrapAddress ; Get the current _InitFonts routine
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move.l (a1),a1
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move.l a0,kBranchSize(a1) ; Save the address of _InitFonts
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move.l a1,a0
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move.w #kInitFontsTrap,d0
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_SetTrapAddress ; Patch it
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bra ExitROvr ; Get out of here. <3>
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;ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
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;
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DoOverrides
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;
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; Version 3 ROvr code starts here
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;
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movem.l d2/a2-a3,-(sp) ; save working registers <5><3>
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move.l ROMMapHndl,a2 ; need to save ROM map attributes
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move.l (a2),a0 ; dereference map handle
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move.w MAttr(a0),-(sp) ; save off current ROM map attributes
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clr.w MAttr(a0) ; clear all ROM map attributes for this routine
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;ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
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; load override resources
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moveq #1,d2 ; start with ROv# index of 1 <6>
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ForEachOverrideList
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subq #4,sp ; make space for handle
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move.l #'ROv#',-(sp) ; push 'ROv#' for _Get1IxResource
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move.w d2,-(sp) ; push resource index <6>
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move.w #mapTrue,ROMMapInsert ; link in ROM map w/ResLoad true
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_GetIndResource ; get ROv# resource (must be locked) <6>
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move.l (sp)+,d0 ; save handle to the list
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bz.s ROvrNOut ; no ROv#, so get out of here
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move.l d0,-(sp) ; save handle for ReleaseResource later
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move.l d0,a1 ; get ROv# resource handle
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move.l (a1),a1 ; get ROv# resource pointer
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move.l ROMBase,a0 ; get a pointer to the ROM <6>
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move.w 8(a0),d0 ; get the ROM version number <6>
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cmp.w (a1)+,d0 ; check if the ROv# is for this ROM <6>
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bne.s NextOverrideList ; if wrong version, go on to the next ROv# resource <6>
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move.w (a1)+,d1 ; count-1 of items in list
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ForEachResourceInList
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subq #4,sp ; make space for handle
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move.l (a1)+,-(sp) ; push type onto stack
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move.w (a1)+,-(sp) ; push id onto stack
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move.w #mapFalse,ROMMapInsert ; link in ROM map w/ResLoad false
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_Get1Resource
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move.l (sp)+,d0 ; get that resource
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bz.s NextResourceInList ; if no resource, advance to the next one
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move.l d0,-(sp) ; push handle for RmveResource later
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subq #4,sp ; make space for map entry offset
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move.l d0,-(sp) ; push resource handle onto stack
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move.w #mapFalse,ROMMapInsert ; link in ROM map w/ResLoad false
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st ResOneDeep ; since there is no one-deep version of RsrcMapEntry
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_RsrcMapEntry ; ignore errors from RsrcMapEntry
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move.l (sp)+,a0 ; get map entry offset
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add.l (a2),a0 ; make the map offset into a pointer
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clr.b RAttr(a0) ; clear the attributes for the resource (protected, etc.)
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; handle to remove is already on stack
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move.w #mapFalse,ROMMapInsert ; link in ROM map w/ResLoad false
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_RmveResource ; ignore errors from RmveResource
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; normally, we would do a DisposHandle here, but the ROM resources are
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; in their own special heap, and no-one cares about the wasted master pointer
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NextResourceInList
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dbra d1,ForEachResourceInList ; loop through the resources
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NextOverrideList
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_ReleaseResource ; handle to release is already on stack
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addq.w #1,d2 ; advance to next resource index <6>
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bra.s ForEachOverrideList ; go loop for the next resource <6>
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;ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
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ROvrNOut
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move.l (a2),a0 ; dereference ROM map handle
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move.w (sp)+,MAttr(a0) ; restore ROM map attributes
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movem.l (sp)+,d2/a2-a3 ; restore working registers <6><5><3>
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ExitROvr ; Exit point after _InitFonts is patched
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lea ROvr,a0 ; get pointer to this resource
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_RecoverHandle ; get handle to this resource
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move.l (sp),-(sp) ; put the handle below a copy of the return address
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move.l a0,4(sp) ; put the handle on the stack for ReleaseResource
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_ReleaseResource autoPop ; release this resource and return
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endproc
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;ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
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end
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