From 4acb5a76257eccb8475c97233881176188cce8ce Mon Sep 17 00:00:00 2001
From: Garritt McCune <gmccune@corp.dpcpipe.com>
Date: Tue, 23 Jul 2024 14:52:56 -0500
Subject: [PATCH] Updated the register and memory layout figure.

---
 chapter 1.tex | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/chapter 1.tex b/chapter 1.tex
index 8325e7c..61a436a 100644
--- a/chapter 1.tex	
+++ b/chapter 1.tex	
@@ -6,27 +6,38 @@ Eight 32-bit general purpose registers are available for holding operands and me
 	mov r1, bp - sizeof(void *) 
 \end{verbatim}
 Finally we have the Program Counter which contains a 32 bit address that points to the next instruction to execute.
-\tikzstyle{blockRow} = [rectangle, minimum width=10cm, minimum height=0.5cm, text centered, draw=black]
 
 \def\minY{-5} \def\maxY{5}
 \def\minX{-5} \def\maxX{5}
 \begin{figure}[h]
 	\centering
 	\begin{tikzpicture}[node distance=0cm]
-		\node [draw, fit={(\minX, 0) (0, 0.5)}, label=center:Status Register (Flags)] (flags) {};
-		%\draw (\minX,0.5) node[above=1em] {31} rectangle (0, 1) node[midway] {Status Register (Flags)} node[above] (lsb) {0};
+		\node [draw, fit={(\minX, 0) (0, 0.5)}, label=center:Flags] (flags) {};
+		\node [draw, fit={(\minX, -1) (0, -1.5)}, label=center:r1] (r1) {};
+		\node [draw, fit={(\maxX / 2, 0) (\maxX, \minY)}, label=center:Memory] (memory) {};
+		
 		\draw (flags);
+		\node[above =of flags] {Status Register};
 		\node[above left=of flags] {31};
 		\node[above right=of flags] {0};
 		
-		%\draw (\minX,-\pos / 2 - 0.5) rectangle (0, -\pos / 2) node[midway] (register1) {r1};
+		\draw (r1);
+		\node[above=of r1] {General Purpose Registers};
+		\node[above left=of r1] {31};
+		\node[above right=of r1] {0};
 		
-		\foreach \pos in {1,...,8} {
-			\draw (\minX,-\pos / 2 - 0.5) rectangle (0, -\pos / 2) node[midway] (register\pos) {r\pos};
+		\foreach \pos in {2,...,8} {
+			\node [draw, fit={(\minX, -\pos) (0, -\pos - 0.5)}, label=center:r\pos] (r\pos) {};
+			\draw (r\pos);
 		}
-		%\draw node[above=of register1] {General Purpose Registers};
 		
-		\draw (\maxX / 2, 1) rectangle (\maxX, \minY) node[midway] {Memory};
+		\draw (memory);
+		\node [above =of memory] {Linear Memory (2\textsuperscript{32} Bytes)};
+		\node [above right =of memory, yshift=-1em] {0x00000000};
+		\node [below right =of memory, yshift=1em] {0xFFFFFFFF};
+		
+		%\draw (memory.north east) -- (memory.south west);
+		%\node at (memory.south east) {test};
 	\end{tikzpicture}
 	\caption{Register Bit Layout}
 \end{figure}