# hdgl_kernel_generator.py
import numpy as np
import struct
import os

class HDGL_VM_32:
    def __init__(self):
        self.D = np.zeros(32)
    def step(self, steps=10):
        for _ in range(steps):
            self.D = np.tanh(self.D + 0.618)

def generate_minimal_elf(vm: HDGL_VM_32, filename="hdgl_kernel.elf"):
    # Convert lattice to bytes for .text segment
    code_bytes = b""
    # x86_64 syscall: write(1, message, len)
    # We'll generate simple NOP sled + lattice-seeded bytes
    code_bytes += b"\x90" * 64  # NOP sled
    for val in vm.D:
        # Map float [-1,1] -> byte [0x00-0xFF]
        b = int((val + 1) * 127.5) & 0xFF
        code_bytes += struct.pack("B", b)
    # Pad to 256 bytes
    code_bytes += b"\x90" * (256 - len(code_bytes))

    # Minimal ELF header (x86_64, little endian)
    e_ident = b"\x7fELF" + b"\x02\x01\x01" + b"\x00"*9
    e_type = struct.pack("<H", 2)   # ET_EXEC
    e_machine = struct.pack("<H", 0x3E)  # x86_64
    e_version = struct.pack("<I", 1)
    e_entry = struct.pack("<Q", 64 + 56)  # Entry after headers
    e_phoff = struct.pack("<Q", 64)
    e_shoff = struct.pack("<Q", 0)
    e_flags = struct.pack("<I", 0)
    e_ehsize = struct.pack("<H", 64)
    e_phentsize = struct.pack("<H", 56)
    e_phnum = struct.pack("<H", 1)
    e_shentsize = struct.pack("<H", 0)
    e_shnum = struct.pack("<H", 0)
    e_shstrndx = struct.pack("<H", 0)

    elf_header = e_ident + e_type + e_machine + e_version + e_entry + e_phoff + e_shoff + \
                 e_flags + e_ehsize + e_phentsize + e_phnum + e_shentsize + e_shnum + e_shstrndx

    # Program header: PT_LOAD
    p_type = struct.pack("<I", 1)  # PT_LOAD
    p_flags = struct.pack("<I", 5) # RX
    p_offset = struct.pack("<Q", 64 + 56)
    p_vaddr = struct.pack("<Q", 0x400000)
    p_paddr = struct.pack("<Q", 0x400000)
    p_filesz = struct.pack("<Q", len(code_bytes))
    p_memsz = struct.pack("<Q", len(code_bytes))
    p_align = struct.pack("<Q", 0x1000)
    prog_header = p_type + p_flags + p_offset + p_vaddr + p_paddr + p_filesz + p_memsz + p_align

    # Write ELF file
    with open(filename, "wb") as f:
        f.write(elf_header)
        f.write(prog_header)
        f.write(code_bytes)

    print(f"[+] Minimal HDGL kernel ELF generated: {filename}")

def hdgl_native_boot():
    vm = HDGL_VM_32()
    vm.step(steps=20)
    generate_minimal_elf(vm)
    print("[+] Boot with QEMU: qemu-system-x86_64 -kernel hdgl_kernel.elf -nographic")

if __name__ == "__main__":
    hdgl_native_boot()
