From fb72582468d8efede977793ad8e6a858a81a0e44 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Mon, 13 Oct 2025 01:19:44 -0400
Subject: emux: cpu: Add emulation of ADD instruction

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 emux64/src/include/cpu/cpu.h | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'emux64/src/include')

diff --git a/emux64/src/include/cpu/cpu.h b/emux64/src/include/cpu/cpu.h
index bffb6c0..84c8832 100644
--- a/emux64/src/include/cpu/cpu.h
+++ b/emux64/src/include/cpu/cpu.h
@@ -54,6 +54,13 @@
 #define OP_DIV 0x04     /* 2-op DIV */
 #define OP_HLT 0x0E     /* Halt */
 
+/*
+ * X<n> register encoding
+ *
+ * Range: 0x00 - 0xE
+ */
+#define REG_XN_BASE     0x00
+#define REG_XN_LIMIT    (REG_XN_BASE + 0x0E)
 
 /*
  * Represents a single unit of execution
-- 
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