Copy bios device functions to kernel

2023-09-04 14:31:55 -07:00
parent 791bffb248
commit a770d938de
12 changed files with 1071 additions and 0 deletions
--- a/sw/kernel/devices/board_io.s
+++ b/sw/kernel/devices/board_io.s
@@ -0,0 +1,24 @@
+.include "io.inc65"
+
+.importzp sp, sreg
+
+.export _sw_read
+.export _led_set
+
+.autoimport	on
+
+.code
+
+; @out A: The Value of the switches
+; Reads the current values of the switches.
+_sw_read:
+        lda SW
+        ldx #$0
+        rts
+
+; @in A: val
+; @out A: 0 for success, 1 for failure
+; Sets the LEDs
+_led_set:
+        sta LED
+        rts