change file name

from main.c to tvm.c

tvm.c

@@ -0,0 +1,57 @@
+/*
+    TVM is a virtual machine for LC-3 based operating systems and it used for educational purposes.
+    Open-source software under MIT License
+    Written by Erick Ahmed, 2022
+*/
+
+
+#include <stdint.h>>
+
+/* Initializing 128kb of memory */
+uint16_t memory[UINT16_MAX];
+
+/* Initializing 10 registers of which:
+8 general purpose, 1 program counter, 1 conditional */
+enum {
+    RG_GP0 = 0,
+    RG_GP1,
+    RG_GP2,
+    RG_GP3,
+    RG_GP4,
+    RG_GP5,
+    RG_GP6,
+    RG_GP7,
+    RG_PC = 0,       // program counter
+    RG_COND,         // condition flag
+    RG_COUNT
+};
+
+uint16_t reg[RG_COUNT];
+
+/* Creating instruction set opcodes */
+enum {
+    OP_BR = 0,      // branch
+    OP_ADD,         // add
+    OP_LD,          // load
+    OP_ST,          // store
+    OP_JSR,         // jump register
+    OP_AND,         // bitwise add
+    OP_LDR,         // load register
+    OP_STR,         // store register
+    OP_RTI,         // unused opcode
+    OP_NOT,         // bitwise not
+    OP_LDI,         // indirect load
+    OP_STI,         // indirect store
+    OP_JMP,         // jump
+    OP_RES,         // reserved opcode
+    OP_LEA,         // load effective address
+    OP_TRAP,        // execute trap
+};
+
+/* Creating condition flags */
+enum {
+    FL_POS = 1,         // P
+    FL_ZRO = 1 << 1,    // Z
+    FL_NEG = 1 << 2,    // N
+}
+