initial cpu structure :thonk:

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

src/cpu/arm/insruction.hh

@@ -0,0 +1,61 @@
+enum class ArmInstructionFormat {
+    DataProcessingAndFsrTransfer,
+    Multiply,
+    MultiplyLong,
+    SingleDataSwap,
+    BranchAndExchange,
+    HalfwordDataTransferRegisterOffset,
+    HalfwordDataTransferImmediateOffset,
+    SingleDataTransfer,
+    Undefined,
+    BlockDataTransfer,
+    Branch,
+    CoprocessorDataTransfer,
+    CoprocessorDataOperation,
+    CoprocessorRegisterTransfer,
+    SoftwareInterrupt
+};
+
+enum class Condition {
+    EQ = 0b0000,
+    NE = 0b0001,
+    CS = 0b0010,
+    CC = 0b0011,
+    MI = 0b0100,
+    PL = 0b0101,
+    VS = 0b0110,
+    VC = 0b0111,
+    HI = 0b1000,
+    LS = 0b1001,
+    GE = 0b1010,
+    LT = 0b1011,
+    GT = 0b1100,
+    LE = 0b1101,
+    AL = 0b1110
+};
+
+enum class OpCode {
+    AND = 0b0000,
+    EOR = 0b0001,
+    SUB = 0b0010,
+    RSB = 0b0011,
+    ADD = 0b0100,
+    ADC = 0b0101,
+    SBC = 0b0110,
+    RSC = 0b0111,
+    TST = 0b1000,
+    TEQ = 0b1001,
+    CMP = 0b1010,
+    CMN = 0b1011,
+    ORR = 0b1100,
+    MOV = 0b1101,
+    BIC = 0b1110,
+    MVN = 0b1111
+};
+
+enum class Shift {
+    LSL = 0b00,
+    LSR = 0b01,
+    ASR = 0b10,
+    ROR = 0b11
+};

src/cpu/arm/meson.build

@@ -0,0 +1,2 @@
+lib_sources += files(
+)