Added memory region enums preparing for interrupts

1 files changed, 10 insertions, 4 deletions

diff --git a/lc3.c b/lc3.c
index c23dcce..854a3ec 100644
--- a/lc3.c
+++ b/lc3.c
@@ -25,6 +25,8 @@ enum Register
 	REGISTER_R7,
 	REGISTER_PC,
 	REGISTER_PSR,
+	REGISTER_SSR,
+	REGISTER_USR,
 	REGISTER_COUNT,
 };
 
@@ -53,6 +55,7 @@ enum Flag
 	FLAG_POS = 1u << 0,
 	FLAG_ZRO = 1u << 1,
 	FLAG_NEG = 1u << 2,
+	FLAG_SUP = 1u << 15,
 };
 
 enum Trap
@@ -67,7 +70,10 @@ enum Trap
 
 enum Memory
 {
-	MEMORY_START = 0x3000,
+	MEMORY_TRAP = 0x0000,
+	MEMORY_INT = 0x00ff,
+	MEMORY_SUP = 0x0200,
+	MEMORY_USER = 0x3000,
 	MEMORY_KBSR = 0xfe00,
 	MEMORY_KBDR = 0xfe02,
 	MEMORY_DSR = 0xfe04,
@@ -104,7 +110,7 @@ void restore_terminal()
 	die(r, "restore_terminal tcsetattr()");
 }
 
-void handle_interrupt(int signal)
+void handle_signal(int signal)
 {
 	(void) signal;
 	restore_terminal();
@@ -442,10 +448,10 @@ int main(int argc, char ** argv)
 	{
 		die(read_image(argv[i]), "read_image");
 	}
-	signal(SIGINT, handle_interrupt);
+	signal(SIGINT, handle_signal);
 	atexit(restore_terminal);
 	prepare_terminal();
-	registers[REGISTER_PC] = MEMORY_START;
+	registers[REGISTER_PC] = MEMORY_USER;
 	for (;;)
 	{
 		const uint16_t instruction = read_memory(registers[REGISTER_PC]++);