1 files changed, 170 insertions, 0 deletions
diff --git a/lib/acpi.c3l/acpi.c3 b/lib/acpi.c3l/acpi.c3
new file mode 100644
index 0000000..26021dc
--- /dev/null
+++ b/lib/acpi.c3l/acpi.c3
@@ -0,0 +1,170 @@
+module acpi;
+
+import c3os::util;
+
+extern fn int memcmp(void*, void*, usz);
+
+alias Oemid = char[6];
+
+excuse INVALID_DESCRIPTION_HEADER;
+
+enum DescriptionHeaderSignature
+{
+	AEST,
+	AGDI,
+	APIC,
+	APMT,
+	ASPT,
+	BDAT,
+	BERT,
+	BGRT,
+	BOOT,
+	CCEL,
+	CEDT,
+	CPEP,
+	CSRT,
+	DBGP,
+	DBG2,
+	DMAR,
+	DRTM,
+	DSDT,
+	DTPR,
+	ECDT,
+	EINJ,
+	ERST,
+	ETDT,
+	FACP,
+	FACS,
+	FPDT,
+	GTDT,
+	HEST,
+	HPET,
+	IBFT,
+	IERS,
+	IORT,
+	IOVT,
+	IRDT,
+	IVRS,
+	KEYP,
+	LPIT,
+	MCFG,
+	MCHI,
+	MHSP,
+	MISC,
+	MPAM,
+	MPST,
+	MSCT,
+	MSDM,
+	NBFT,
+	NFIT,
+	NHLT,
+	PCCT,
+	PHAT,
+	PMTT,
+	PPTT,
+	PRMT,
+	PSDT,
+	RASF,
+	RAS2,
+	RGRT,
+	RHCT,
+	RIMT,
+	RQSC,
+	RSDT,
+	SBST,
+	SDEI,
+	SDEV,
+	SLIC,
+	SLIT,
+	SPCR,
+	SPMI,
+	SRAT,
+	SSDT,
+	STAO,
+	SVKL,
+	SWFT,
+	TCPA,
+	TPM2,
+	UEFI,
+	WAET,
+	WDAT,
+	WDDT,
+	WDRT,
+	WPBT,
+	WSMT,
+	XENV,
+	XSDT,
+}
+
+$assert(DescriptionHeader::size == 36);
+$assert(RootSystemDescriptionPointer::size == 35);
+struct RootSystemDescriptionPointer @packed
+{
+	char[8] signature;
+	char checksum;
+	Oemid oemid;
+	char revision;
+	uint rsdtAddress;
+	uint length;
+	ExtendedSystemDescriptionTable* xsdtAddress;
+	char[3] _res;
+}
+
+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);
+}
+
+$assert(ExtendedSystemDescriptionTable::size == 36);
+struct ExtendedSystemDescriptionTable @packed
+{
+	inline DescriptionHeader header;
+	ulong[*] descriptionHeaders;
+}
+
+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;
+}
+
+struct DescriptionHeader @packed
+{
+	char[4] signature;
+	uint length;
+	char revision;
+	char checksum;
+	Oemid oemid;
+	char[8] oemTableId;
+	uint oemRevision;
+	uint creatorId;
+	uint creatorRevision;
+}
+
+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~;
+}