1 files changed, 33 insertions, 5 deletions
diff --git a/qtmips_machine/alu.h b/qtmips_machine/alu.h
index e913b0c..974b462 100644
--- a/qtmips_machine/alu.h
+++ b/qtmips_machine/alu.h
@@ -1,11 +1,39 @@
 #ifndef ALU_H
 #define ALU_H
 
+#include <cstdint>
+#include <QString>
 
-class Alu
-{
-public:
-    Alu();
+// TODO Any other operations? We seems to be missing a lot of them.
+enum AluOp : std::uint8_t {
+    ALU_OP_SLL = 0,
+    ALU_OP_SRL = 2,
+    ALU_OP_SRA,
+    ALU_OP_SLLV,
+    ALU_OP_SRLV = 6,
+    ALU_OP_SRAV,
+    ALU_OP_ADD = 32,
+    ALU_OP_ADDU,
+    ALU_OP_SUB,
+    ALU_OP_SUBU,
+    ALU_OP_AND,
+    ALU_OP_OR,
+    ALU_OP_XOR,
+    ALU_OP_NOR,
+    ALU_OP_SLT = 42,
+    ALU_OP_SLTU,
+    ALU_OP_LAST = 64 // First impossible operation (just to be sure that we don't overflow)
 };
 
-#endif // ALU_H
-\ No newline at end of file
+// Do ALU operation.
+// operation: This is function field from instruction or shifted opcode for immediate instructions
+// s: Loaded from rs. Also calles as source.
+// t: Loaded from rt or immediate field from instruction it self. Also called as target.
+// sa: This is value directly from instruction it self (sa section) used for shift operations
+// Returned value is commonly saved to rt/rd or any other way passed trough core
+std::uint32_t alu_operate(enum AluOp operation, std::uint32_t s, std::uint32_t t, std::uint8_t sa);
+
+// Returns string representation of ALU instruction (internally used by Instruction::to_str)
+QString alu_str(enum AluOp operation, std::uint32_t s, std::uint32_t t, std::uint8_t sa);
+
+#endif // ALU_H