reserve memory for mouse PM if RESERVE_MOUSE_MEMORY is defined (normally

yes)

git-svn-id: svn://svn.cc65.org/cc65/trunk@449 b7a2c559-68d2-44c3-8de9-860c34a00d81

diff --git a/libsrc/atari/crt0.s b/libsrc/atari/crt0.s
index db0d7ec598081d9fb6ea5d5bf57b00b4133ef49f..7cb180c931ebf26da2748a00f56ab1fbca37af6f 100644 (file)
--- a/libsrc/atari/crt0.s
+++ b/libsrc/atari/crt0.s
@@ -9,6 +9,11 @@
 ; This must be the *first* file on the linker command line
 ;
 
+RESERVE_MOUSE_MEMORY   = 1     ; for P/M
+
+.ifdef RESERVE_MOUSE_MEMORY
+       .export         mouse_pm0
+.endif
        .export         _exit
        .import         getargs, argc, argv
        .import         __hinit, initconio, zerobss, pushax, doatexit
@@ -208,11 +213,27 @@ L2:       lda     zpsave,x
        sbc     grmemusage+1,y
        tax
        pla
+.ifdef RESERVE_MOUSE_MEMORY
+
+adj_mouse:
+       txa                     ; get upper byte of address
+       and     #%11111000      ; make 2k aligned
+       sec
+       sbc     #%00001000      ; reserve 2k
+       tax
+       adc     #3              ; add 4 (C = 1)
+       sta     mouse_pm0
+       lda     #0
+.endif
        rts
 
 ignore:        lda     MEMTOP
        ldx     MEMTOP+1
+.ifdef RESERVE_MOUSE_MEMORY
+       bne     adj_mouse
+.else
        rts
+.endif
 
 .endproc
 
@@ -278,6 +299,9 @@ spsave:             .res    1
 appmsav:       .res    1
 old_shflok:    .res    1
 old_lmargin:   .res    1
+.ifdef RESERVE_MOUSE_MEMORY
+mouse_pm0:     .res    1
+.endif
 
        .segment "AUTOSTRT"
        .word   $02E0