IOS emulation

IOS/
├── IOS.cpp          # Main IOS kernel
├── ES/              # ES (ETicket Services) - title management
├── FS/              # FS (FileSystem) - NAND filesystem
├── DI/              # DI (Disc Interface) - DVD access
├── USB/             # USB device emulation
├── Network/         # Network services (KD, WD, NCD)
├── SDIO/            # SD card interface
├── STM/             # State Transition Manager (power)
└── Crypto/          # Encryption/decryption

// IPC request structure
struct IPCCommandRequest {
  u32 command;     // Open, Close, Read, Write, Seek, Ioctl, Ioctlv
  u32 fd;          // File descriptor
  u32 arg0, arg1, arg2, arg3, arg4;
};

// Launch title
IOCTL_ES_LAUNCH(u64 title_id);  

// Get title info
IOCTL_ES_GETTITLEID(u64* title_id);
IOCTL_ES_GETTITLECONTENTS(u64 title_id, ...);

// Ticket operations
IOCTL_ES_GETTICKETVIEWS(u64 title_id, ...);
IOCTL_ES_ADDTICKET(const u8* ticket);

// System titles (high 32 bits = 0x00000001)
0x0000000100000002  // System Menu
0x0000000100000009  // IOS9  
0x000000010000003A  // IOS58

// Game titles (high 32 bits = game code)
0x00010000524D4345  // Mario Kart Wii

/
├── sys/           # System files
├── title/         # Installed titles
│   ├── 00000001/  # System titles
│   └── 00010000/  # Game titles
├── shared1/       # Shared save data
├── shared2/       # System data
├── tmp/           # Temporary files
└── meta/          # Metadata

// Open file
fd = IOS_Open("/title/00010000/...", mode);

// Read/write
IOS_Read(fd, buffer, size);
IOS_Write(fd, buffer, size);

// Directory operations  
IOS_ReadDirectory("/title/00010000/", ...);
IOS_CreateDir("/tmp/foo");

User/Wii/
└── title/
    └── 00010000/
        └── 524D4345/  # Title files
            ├── content/
            └── data/   # Save data

// SD card operations
IOCTL_SDIO_READHCR(...);     // Read SD registers
IOCTL_SDIO_WRITEHCR(...);
IOCTL_SDIO_SENDCMD(...);     # Send SD command

// Decrypt title content
AES128_CBC_Decrypt(key, iv, encrypted_data, decrypted_data, size);

/title/00010000/GAMEID/data/
└── wii_save.bin  # Game save file

User/Wii/title/00010000/GAMEID/data/