1 files changed, 61 insertions, 0 deletions
diff --git a/acpi.c3l/acpi.c3 b/acpi.c3l/acpi.c3
new file mode 100644
index 0000000..1842866
--- /dev/null
+++ b/acpi.c3l/acpi.c3
@@ -0,0 +1,61 @@
+/**
+ *    Copyright (C) 2026 andromeda
+ *
+ *    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/>.
+**/
+
+module acpi;
+
+import c3os::util;
+
+extern fn int memcmp(void*, void*, usz);
+
+fn bool RootSystemDescriptionPointer.is_valid(&self)
+{
+	if (memcmp(&self.signature, "RSD PTR ", 8) != 0) return false;
+	if (self.revision != 2) return false;
+	char sum = 0;
+	for (int i = 0; i < 20; i++) sum += ((char*)self)[i];
+	if (sum != 0) return false;
+	for (int i = 0; i < RootSystemDescriptionPointer::size; i++) sum += ((char*)self)[i];
+	return (sum == 0);
+}
+
+fn bool ExtendedSystemDescriptionTable.is_valid(&self)
+{
+	if (memcmp(&self.signature, "XSDT", 4) != 0) return false;
+	if (self.revision != 1) return false;
+	char sum = 0;
+	for (uint i = 0; i < self.length; i++) sum += ((char*)self)[i];
+	if (sum != 0) return false;
+	return true;
+}
+
+fn bool DescriptionHeader.is_valid(&self)
+{
+	if (catch excuse = self.sig()) return false;
+	char sum = 0;
+	for (uint i = 0; i < self.length; i++) sum += ((char*)self)[i];
+	if (sum != 0) return false;
+	return true;
+}
+
+fn DescriptionHeaderSignature? DescriptionHeader.sig(&self)
+{
+	foreach (i, name : DescriptionHeaderSignature::names)
+	{
+		if (memcmp(name, &self.signature, 4) == 0) return (DescriptionHeaderSignature)i;
+	}
+	return INVALID_DESCRIPTION_HEADER~;
+}