Working SERV cpu

scripts/hex_to_mif.py

@@ -0,0 +1,104 @@
+#!/usr/bin/env python3
+"""Convert a simple .hex image to a plain .mif-style binary file.
+
+Default output format matches build/mem_8kx8b.mif in this repo:
+- one binary word per line
+- no header
+"""
+
+from __future__ import annotations
+
+import argparse
+from pathlib import Path
+
+
+def parse_tokens(path: Path) -> list[int]:
+    values: list[int] = []
+    for raw in path.read_text().splitlines():
+        line = raw.split("//", 1)[0].split("#", 1)[0].strip()
+        if not line:
+            continue
+        for token in line.replace(",", " ").split():
+            if token.lower().startswith("0x"):
+                token = token[2:]
+            values.append(int(token, 16))
+    return values
+
+
+def pack_words(
+    byte_values: list[int], word_bytes: int, little_endian: bool
+) -> list[int]:
+    if word_bytes <= 0:
+        raise ValueError("word_bytes must be >= 1")
+    if word_bytes == 1:
+        return byte_values[:]
+
+    words: list[int] = []
+    for i in range(0, len(byte_values), word_bytes):
+        chunk = byte_values[i : i + word_bytes]
+        if len(chunk) < word_bytes:
+            chunk = chunk + [0] * (word_bytes - len(chunk))
+
+        word = 0
+        if little_endian:
+            for b_idx, b in enumerate(chunk):
+                word |= (b & 0xFF) << (8 * b_idx)
+        else:
+            for b in chunk:
+                word = (word << 8) | (b & 0xFF)
+        words.append(word)
+    return words
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(description="Convert .hex to plain .mif")
+    parser.add_argument("input_hex", type=Path, help="Input .hex file")
+    parser.add_argument("output_mif", type=Path, help="Output .mif file")
+    parser.add_argument(
+        "--word-bytes",
+        type=int,
+        default=1,
+        help="Bytes per output word (default: 1)",
+    )
+    parser.add_argument(
+        "--little-endian",
+        action="store_true",
+        help="Pack bytes little-endian when --word-bytes > 1 (default)",
+    )
+    parser.add_argument(
+        "--big-endian",
+        action="store_true",
+        help="Pack bytes big-endian when --word-bytes > 1",
+    )
+    parser.add_argument(
+        "--depth",
+        type=int,
+        default=0,
+        help="Optional output depth (pads with zeros up to this many words)",
+    )
+    args = parser.parse_args()
+
+    if args.little_endian and args.big_endian:
+        raise SystemExit("Choose only one of --little-endian or --big-endian")
+
+    little_endian = True
+    if args.big_endian:
+        little_endian = False
+
+    words = pack_words(parse_tokens(args.input_hex), args.word_bytes, little_endian)
+    width_bits = args.word_bytes * 8
+    max_word = (1 << width_bits) - 1
+
+    if args.depth > 0 and args.depth < len(words):
+        raise SystemExit(
+            f"Requested --depth={args.depth} but image has {len(words)} words"
+        )
+    if args.depth > len(words):
+        words.extend([0] * (args.depth - len(words)))
+
+    lines = [f"{(w & max_word):0{width_bits}b}" for w in words]
+    args.output_mif.write_text("\n".join(lines) + ("\n" if lines else ""))
+
+
+if __name__ == "__main__":
+    main()