Add KIM-1 Support

2022-06-04 13:00:48 -07:00
parent 30dc9b8d1a
commit 799aec23a6
18 changed files with 425 additions and 1 deletions
--- a/libsrc/kim1/crt0.s
+++ b/libsrc/kim1/crt0.s
@@ -0,0 +1,47 @@
+;
+; Startup code for cc65 (kim-1 version)
+;
+
+        .export         _init, _exit
+        .export         __STARTUP__ : absolute = 1      ; Mark as startup
+
+        .import         _main
+        .import         initlib, donelib, copydata, zerobss
+        .import         __RAM_START__, __RAM_SIZE__     ; Linker generated
+        .import         __STACKSIZE__                   ; Linker generated
+
+        .include        "zeropage.inc"
+        .include        "kim1.inc"
+
+
+; Place the startup code in a special segment
+
+.segment  "STARTUP"
+
+
+; A little light housekeeping
+
+_init:    cld                          ; Clear decimal mode
+
+; Set cc65 argument stack pointer
+
+          lda     #<(__RAM_START__ + __RAM_SIZE__)
+          sta     sp
+          lda     #>(__RAM_START__ + __RAM_SIZE__)
+          sta     sp+1
+
+; Initialize memory storage
+
+          jsr     zerobss              ; Clear BSS segment
+          jsr     copydata             ; Initialize DATA segment
+          jsr     initlib              ; Run constructors
+
+; Call main()
+
+          jsr     _main
+
+; Back from main (this is also the _exit entry).  There may be a more elegant way to9
+; return to the monitor on the Kim-1, but I don't know it!
+
+_exit:    brk
+