Add some basic fat32 code

2023-12-03 23:27:45 -08:00
parent 184c58b962
commit 5c74d161d4
11 changed files with 326 additions and 7 deletions
--- a/sw/kernel/devices/multiplier.s
+++ b/sw/kernel/devices/multiplier.s
@@ -0,0 +1,36 @@
+.include "io.inc65"
+
+.MACPACK generic
+
+.import popax
+.importzp sreg
+
+.export _lmulii, _imulii
+
+.code
+
+.proc _lmulii
+    sta MULTIPLIER_BL
+    stx MULTIPLIER_BH
+    jsr popax
+    sta MULTIPLIER_AL
+    stx MULTIPLIER_AH
+    lda MULTIPLIER_OHL
+    sta sreg
+    lda MULTIPLIER_OHH
+    sta sreg+1
+    lda MULTIPLIER_OLL
+    ldx MULTIPLIER_OLH
+    rts
+.endproc
+
+.proc _imulii
+    sta MULTIPLIER_BL
+    stx MULTIPLIER_BH
+    jsr popax
+    sta MULTIPLIER_AL
+    stx MULTIPLIER_AH
+    lda MULTIPLIER_OLL
+    ldx MULTIPLIER_OLH
+    rts
+.endproc