Start terminal driver

sw/kernel/devices/terminal.h

@@ -0,0 +1,13 @@
+#ifndef _TERMINAL_H
+#define _TERMINAL_H
+
+#include <stdint.h>
+
+int8_t terminal_read(uint8_t fd, void* buf, uint8_t nbytes);
+int8_t terminal_write(uint8_t fd, const void* buf, uint8_t nbytes);
+int8_t terminal_open(const uint8_t* filename);
+int8_t terminal_close(uint8_t fd);
+
+
+#endif /* _TERMINAL_H */
+

sw/kernel/devices/terminal.s

@@ -0,0 +1,41 @@
+.MACPACK generic
+
+.autoimport
+
+.export _terminal_read, _terminal_write, _terminal_open, _terminal_close
+
+.data
+
+terminal_buf: .res 128
+
+.code
+
+.proc _terminal_read
+
+.endproc
+
+.proc _terminal_write
+
+.endproc
+
+; terminal_open
+; open terminal device
+; Inputs: uint8_t* filename
+; Outputs: none
+; Return Value: 0 on success
+; Function: none.
+.proc _terminal_open
+    lda #$0
+    rts
+.endproc
+
+; terminal_close
+; close terminal device
+; Inputs: int32_t fd
+; Outputs: none
+; Return Value: 0 on success (but this always failes)
+; Function: none.
+.proc _terminal_close
+    lda #$ff    ; -1
+    rts
+.endproc