From 5b6a4e14421a2702437adc1a4ae7defa815659f8 Mon Sep 17 00:00:00 2001
From: Byron Lathi <bslathi19@gmail.com>
Date: Tue, 28 Nov 2023 23:52:27 -0800
Subject: [PATCH] Start terminal driver

---
 sw/kernel/devices/terminal.h | 13 ++++++++++++
 sw/kernel/devices/terminal.s | 41 ++++++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)
 create mode 100644 sw/kernel/devices/terminal.h
 create mode 100644 sw/kernel/devices/terminal.s

diff --git a/sw/kernel/devices/terminal.h b/sw/kernel/devices/terminal.h
new file mode 100644
index 0000000..42a9864
--- /dev/null
+++ b/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 */
+
diff --git a/sw/kernel/devices/terminal.s b/sw/kernel/devices/terminal.s
new file mode 100644
index 0000000..56351cb
--- /dev/null
+++ b/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
\ No newline at end of file