refactor common parts into inc/ch375.h and add win9x, linux drivers

1 files changed, 33 insertions, 0 deletions

diff --git a/w9x/utils.h b/w9x/utils.h
new file mode 100644
index 0000000..527a14b
--- /dev/null
+++ b/w9x/utils.h
@@ -0,0 +1,33 @@
+/*
+ * CHU - Misc utilities
+ * Copyright (C) 2026 Javier S. Pedro
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef UTILS_H
+#define UTILS_H
+
+#define SWAPNC_32(w)    (\
+                            (((w) & 0x000000FFUL) << 24) |\
+                            (((w) & 0x0000FF00UL) << 8) |\
+                            (((w) & 0x00FF0000UL) >> 8) |\
+                            (((w) & 0xFF000000UL) >> 24)\
+                        )
+
+/** Computes log2 for an unsigned integer, uses 386+ bsr instruction */
+static inline unsigned ulog2(uint32_t x);
+#pragma aux ulog2 = "bsr eax, eax" parm [eax] value [eax] modify exact [] nomemory
+
+#endif // UTILS_H