mirror of
https://github.com/elliotnunn/supermario.git
synced 2024-11-26 16:49:18 +00:00
236 lines
8.4 KiB
Plaintext
236 lines
8.4 KiB
Plaintext
;
|
|
; File: CacheControl.a
|
|
;
|
|
; Contains: This code adds a new trap to programatically control
|
|
; parameters of the RAMCache.
|
|
;
|
|
; Written by: Joe Buczek
|
|
;
|
|
; Copyright: © 1987-1991, 1993 by Apple Computer, Inc., all rights reserved.
|
|
;
|
|
; Change History (most recent first):
|
|
;
|
|
; <SM3> 4/29/93 chp Removed ioMisc equate, now in SysEqu.a.
|
|
; <2> 9/13/91 JSM Add a header.
|
|
; <1.0> 3/20/89 MSH Ported from system disk to ROM.
|
|
; 3/7/89 JB Made ROM-able
|
|
; 12/2/87 JB Changed for ioParamblock interface
|
|
; 11/25/87 JB Added get/set cache status
|
|
; 11/20/87 JB New today.
|
|
;
|
|
|
|
TITLE 'HFS Cache Control Trap'
|
|
;____________________________________________________________________________________
|
|
;
|
|
; Function: These traps provide an interface to the file system
|
|
; caching mechanism.
|
|
;
|
|
; Cache Trap
|
|
; Routines:
|
|
; GetCSize Get cache size
|
|
; SetCSize Set cache size
|
|
; GetApZnSiz Get minimum application zone size
|
|
; SetApZnSiz Set minimum application zone size
|
|
; GetMaxCXfr Get maximum cached transfer size
|
|
; SetMaxCXfr Set maximum cached transfer size
|
|
; GetCStatus Get cache status
|
|
; SetCStatus Set cache status
|
|
;
|
|
; Internal
|
|
; Routines:
|
|
; GetCacSize Get current size of cache
|
|
;
|
|
; To do:
|
|
; - Need to completely redefine way cache uses memory. Should be
|
|
; a trap here to feed memory to the cache (called by MultiFinder
|
|
; or memory manager), also a way to ask for those blocks back
|
|
; if they are needed.
|
|
; - Need some reasonableness checks for parameters.
|
|
;
|
|
; Build notes:
|
|
;
|
|
; This file should be assembled as follows:
|
|
;
|
|
; asm -d FSPNonPortable CacheTrap.a
|
|
;
|
|
;_____________________________________________________________________________
|
|
|
|
PRINT OFF
|
|
include 'SysEqu.a'
|
|
include 'SysErr.a'
|
|
include 'FSPrivate.a'
|
|
include 'DiskCachePriv.a'
|
|
PRINT ON
|
|
|
|
;_____________________________________________________________________________
|
|
; Cache trap dispatcher
|
|
;
|
|
; Supplied:
|
|
; D0.W Service selector index
|
|
; A0.L New cache parameter value if call is a 'set' call
|
|
;
|
|
; Returned:
|
|
; D0.L Result code
|
|
; 'ParamErr' is returned if either the selector
|
|
; is invalid or if the value supplied on a 'set'
|
|
; call is unreasonable
|
|
; A0.L Requested cache parameter value if the
|
|
; call was a 'get' call
|
|
;_____________________________________________________________________________
|
|
CacheProc PROC EXPORT
|
|
|
|
IMPORT FSQueueSync, CmdDone
|
|
|
|
;
|
|
; Cache trap dispatch table:
|
|
;
|
|
CTrapTbl dc.w GetCSize-CTrapTbl ; 0 - get cache size
|
|
dc.w SetCSize-CTrapTbl ; 1 - set cache size
|
|
dc.w GetApZnSiz-CTrapTbl ; 2 - get min application zone size
|
|
dc.w SetApZnSiz-CTrapTbl ; 3 - set min application zone size
|
|
dc.w GetMaxCXfr-CTrapTbl ; 4 - get max cached transfer size
|
|
dc.w SetMaxCXfr-CTrapTbl ; 5 - set max cached transfer size
|
|
dc.w GetCStatus-CTrapTbl ; 6 - get cache status
|
|
dc.w SetCStatus-CTrapTbl ; 7 - set cache status
|
|
|
|
maxCacheTrap equ (*-CTrapTbl)/2 ; Number of traps defined
|
|
|
|
;_____________________________________________________________________________
|
|
; Cache control trap entrypoint
|
|
;_____________________________________________________________________________
|
|
EXPORT CacheTrap
|
|
CacheTrap cmp.w #maxCacheTrap,d0 ; Valid trap index?
|
|
blo.s @1 ; Xfer if so...
|
|
moveq #ParamErr,d0 ; Else, indicate parameter error
|
|
rts
|
|
@1
|
|
lea CTrapTbl,a1 ; Base of dispatch table
|
|
add.w d0,d0 ; Trap index into WORD index
|
|
add.w (a1,d0),a1 ; Routine to invoke
|
|
jmp (a1) ; Go to requested routine...
|
|
CTExit
|
|
jmp CmdDone ; Exit via the file system...
|
|
|
|
;_____________________________________________________________________________
|
|
; 0 -- Get cache size
|
|
;_____________________________________________________________________________
|
|
GetCSize
|
|
jsr FSQueueSync ; Synchronize with the file manager
|
|
move.l CacheVars,a1 ; Cache vars address
|
|
move.l OldBufPtr(a1),d0 ; Pre-cache BufPtr
|
|
sub.l NewBufPtr(a1),d0 ; Size of cache = (Pre-cache BufPtr)-current
|
|
move.l d0,ioMisc(a0) ; Return in param block
|
|
moveq #0,d0 ; Result = SUCCESS
|
|
bra.s CTExit
|
|
|
|
;_____________________________________________________________________________
|
|
; 1 -- Set cache size
|
|
;_____________________________________________________________________________
|
|
SetCSize
|
|
jsr FSQueueSync ; Synchronize with the file manager
|
|
move.l ioMisc(a0),d0 ; Get desired cache size
|
|
moveq #15,d1 ; Divide by 32K
|
|
lsr.l d1,d0 ; ...
|
|
move.b d0,CacheConfig ; Set mem config for next launch
|
|
moveq #0,d0 ; Result = SUCCESS
|
|
bra.s CTExit
|
|
|
|
;_____________________________________________________________________________
|
|
; 2 -- Get minimum application zone size
|
|
;_____________________________________________________________________________
|
|
GetApZnSiz
|
|
jsr FSQueueSync ; Synchronize with the file manager
|
|
move.l CacheVars,a1 ; Cache vars address
|
|
move.l CacheMinZn(a1),ioMisc(a0)
|
|
moveq #0,d0 ; Result = SUCCESS
|
|
bra.s CTExit
|
|
|
|
;_____________________________________________________________________________
|
|
; 3 -- Set minimum application zone size
|
|
;
|
|
; This value is examined whenever the cache is grown. Cache size will
|
|
; not be allowed to exceed this amount. The default value is enough
|
|
; space to load and run an application. The value may be set to a
|
|
; smaller value to enable use of memory for cacheing when it is known
|
|
; that other applications will not be present (MultiFinder).
|
|
;_____________________________________________________________________________
|
|
SetApZnSiz
|
|
jsr FSQueueSync ; Synchronize with the file manager
|
|
move.l CacheVars,a1 ; Cache vars address
|
|
move.l ioMisc(a0),CacheMinZn(a1) ; Set new ApplZone size minimum
|
|
moveq #0,d0 ; Result = SUCCESS
|
|
bra.s CTExit
|
|
|
|
;_____________________________________________________________________________
|
|
; 4 -- Get maximum cached transfer size
|
|
;_____________________________________________________________________________
|
|
GetMaxCXfr
|
|
jsr FSQueueSync ; Synchronize with the file manager
|
|
move.l CacheVars,a1 ; Cache vars address
|
|
move.l CacheByteLim(a1),ioMisc(a0)
|
|
moveq #0,d0 ; Result = SUCCESS
|
|
bra.s CTExit
|
|
|
|
;_____________________________________________________________________________
|
|
; 5 -- Set maximum cached transfer size
|
|
;
|
|
; This value is examined on each "read/write in place" call. These cache
|
|
; calls are used by file system to transfer integral blocks from the
|
|
; caller's buffer to/from the disk (possibly) without caching. Setting
|
|
; this value to a smaller value will tend to keep reading/writing large
|
|
; files from effectively causing a flush of the cache. This might
|
|
; make an environment where multiple files are typically open behave
|
|
; better (i.e., one application won't tend to cause the cache to be
|
|
; flushed).
|
|
;_____________________________________________________________________________
|
|
SetMaxCXfr
|
|
jsr FSQueueSync ; Synchronize with the file manager
|
|
move.l CacheVars,a1 ; Cache vars address
|
|
move.l OldBufPtr(a1),d0 ; Pre-cache BufPtr
|
|
sub.l NewBufPtr(a1),d0 ; Size of cache = (Pre-cache BufPtr)-current
|
|
move.l ioMisc(a0),d1 ; Get caller's parameter
|
|
cmp.l d1,d0 ; Cache size >= requested max xfer size?
|
|
bhs.s @1 ; Xfer if so...
|
|
moveq #ParamErr,d0 ; Else, indicate parameter error
|
|
bra CTExit
|
|
@1
|
|
move.l d1,CacheByteLim(a1) ; Set new max transfer size
|
|
moveq #0,d0 ; Result = SUCCESS
|
|
bra CTExit
|
|
|
|
;_____________________________________________________________________________
|
|
; 6 -- Get cache status
|
|
;_____________________________________________________________________________
|
|
GetCStatus
|
|
jsr FSQueueSync ; Synchronize with the file manager
|
|
move.l CacheVars,a1 ; Cache vars address
|
|
moveq #0,d0 ; Assume cache disabled
|
|
tst.b CurEnable(a1) ; Cache currently enabled?
|
|
beq.s @1 ; Xfer if currently disabled (error?)
|
|
btst #5,CacheEnable ; test enable bit
|
|
beq.s @1 ; Xfer if disabled
|
|
moveq #1,d0 ; Else, indicate "enabled"
|
|
@1
|
|
move.l d0,ioMisc(a0) ; Set returned cache status to caller
|
|
moveq #0,d0 ; Result = SUCCESS
|
|
bra CTExit
|
|
|
|
;_____________________________________________________________________________
|
|
; 7 -- Set cache status
|
|
;_____________________________________________________________________________
|
|
SetCStatus
|
|
jsr FSQueueSync ; Synchronize with the file manager
|
|
tst.l ioMisc(a0) ; Enable or disable?
|
|
beq.s @1 ; Xfer if disable...
|
|
bset #5,CacheEnable ; Else, ask for enable on next launch
|
|
bra.s @2
|
|
@1
|
|
bclr #5,CacheEnable ; Ask for disable on next launch
|
|
@2
|
|
moveq #0,d0 ; Result = SUCCESS
|
|
bra CTExit
|
|
|
|
ENDPROC
|
|
|
|
END
|