#ifndef CONSTANTS_H
#define CONSTANTS_H

// ==============================
// SIC/XE Architecture Constants
// ==============================

// Memory and system constants
constexpr int MEMORY_SIZE = 1 << 20; // 1 MB memory
constexpr int NUM_DEVICES = 256;
constexpr int WORD_SIZE = 24;
constexpr int WORD_MASK = 0xFFFFFF;

// SIC/XE floating point constants
constexpr int SICF_BITS      = 48;
constexpr int SICF_FRAC_BITS = 40;
constexpr int SICF_EXP_BITS  = 7;
constexpr int SICF_EXP_BIAS  = 64;
constexpr unsigned long long SICF_FRAC_MASK = (1ULL << SICF_FRAC_BITS) - 1;

// SW register condition codes
constexpr int CC_LT   = 0x0;  // 00
constexpr int CC_EQ   = 0x1;  // 01
constexpr int CC_GT   = 0x2;  // 10
constexpr int CC_MASK = 0x3;  // mask for 2 bits

// Instruction format bit masks
constexpr int TYPE3_4_SIC_MASK = 0xFC;
constexpr int NI_MASK = 0x03;   // mask for n and i bits
constexpr int NI_SIC = 0x0;

constexpr int BP_BASE_REL_MASK = 0b10;
constexpr int BP_PC_REL_MASK = 0b01;
constexpr int BP_DIRECT_MASK = 0b00;

constexpr int BIT_E_MASK = 0x10; // mask for e bit in F4 and F3 instructions

#endif // CONSTANTS_H