1 files changed, 190 insertions, 0 deletions
diff --git a/kernel/inc/drivers/acpi.h b/kernel/inc/drivers/acpi.h
new file mode 100644
index 0000000..29dcd32
--- /dev/null
+++ b/kernel/inc/drivers/acpi.h
@@ -0,0 +1,190 @@
+// MIT License, Copyright (c) 2020 Marvin Borner
+
+#ifndef ACPI_H
+#define ACPI_H
+
+#include <def.h>
+
+#define RSDP_MAGIC "RSD PTR "
+#define RSDT_MAGIC "RSDT"
+#define MADT_MAGIC "APIC"
+#define FADT_MAGIC "FACP"
+#define HPET_MAGIC "HPET"
+
+#define HPET_MAX_PERIOD 0x05F5E100
+
+struct address_structure {
+	u8 address_space_id;
+	u8 register_bit_width;
+	u8 register_bit_offset;
+	u8 reserved;
+	u32 phys; // Actually u64
+};
+
+/**
+ * General headers
+ */
+
+struct sdt_header {
+	char signature[4];
+	u32 length;
+	u8 revision;
+	u8 checksum;
+	char oem_id[6];
+	char oem_table_id[8];
+	u32 oem_revision;
+	u32 creator_id;
+	u32 creator_revision;
+};
+
+struct sdp_header {
+	char signature[8];
+	u8 checksum;
+	char oem_id[6];
+	u8 revision;
+};
+
+/**
+ * RSDT
+ */
+
+struct rsdt {
+	struct sdt_header header;
+	u32 sdt_pointer[];
+};
+
+/**
+ * MADT
+ */
+
+struct madt_entry_header {
+	u8 type;
+	u8 length;
+};
+
+struct madt {
+	struct sdt_header header;
+	u32 local_address;
+	u32 flags;
+	struct madt_entry_header entry;
+} PACKED;
+
+#define MADT_LOCAL_APIC_ENTRY 0
+#define MADT_IO_APIC_ENTRY 1
+#define MADT_INT_SRC_OVERRIDE_ENTRY 2
+#define MADT_NON_MASKABLE_INT_ENTRY 4 // Where's 3?
+#define MADT_LOCAL_APIC_OVERRIDE_ENTRY 5
+
+struct madt_local_apic_entry {
+	struct madt_entry_header header;
+	u8 processor_id;
+	u8 id;
+	u32 flags;
+} PACKED;
+
+struct madt_io_apic_entry {
+	struct madt_entry_header header;
+	u8 id;
+	u8 reserved;
+	u32 address;
+	u32 global_system_interrupt_base;
+} PACKED;
+
+struct madt_int_src_override_entry {
+	struct madt_entry_header header;
+	u8 bus_source;
+	u8 irq_source;
+	u32 global_system_interrupt;
+	u16 flags;
+} PACKED;
+
+struct madt_non_maskable_int_entry {
+	struct madt_entry_header header;
+	u8 processor_id;
+	u16 flags;
+	u8 lint_number;
+} PACKED;
+
+struct madt_local_apic_override_entry {
+	struct madt_entry_header header;
+	u16 reserved;
+	u64 address;
+} PACKED;
+
+/**
+ * FADT
+ */
+
+struct fadt {
+	struct sdt_header header;
+	// TODO: FADT table (big!)
+} PACKED;
+
+/**
+ * HPET
+ */
+
+struct hpet {
+	struct sdt_header header;
+	u8 hardware_rev_id;
+	u8 comparator_count : 5;
+	u8 counter_size : 1;
+	u8 reserved : 1;
+	u8 legacy_replacement : 1;
+	u16 pci_vendor_id;
+	struct address_structure address;
+	u8 hpet_number;
+	u16 minimum_tick;
+	u8 page_protection;
+} PACKED;
+
+enum hpet_features { hpet_counter_size = 1 << 3, hpet_legacy_replacement_support = 1 << 5 };
+enum hpet_config { hpet_enable = 1 << 0, hpet_legacy_replacement = 1 << 1 };
+enum hpet_timer {
+	hpet_type = 1 << 1,
+	hpet_enable_timer = 1 << 2,
+	hpet_periodic = 1 << 3,
+	hpet_periodic_support = 1 << 4,
+	hpet_size = 1 << 5, // 1 if 64 bit
+	hpet_set_accumulator = 1 << 6,
+	hpet_force_32 = 1 << 8, // For 64 bit
+	hpet_apic_routing = 1 << 13,
+	hpet_fsb = 1 << 14,
+	hpet_fsb_support = 1 << 15,
+	/* routing_capability = 1 << 63 */
+};
+
+struct hpet_registers {
+	u32 features; // enum hpet_features
+	u32 tick_period;
+	u64 reserved1;
+	u64 config; // enum hpet_config
+	u64 reserved2;
+	u32 int_status; // For timer #n
+	u32 reserved3;
+	u8 reserved4[200]; // Why?!
+	u32 counter;
+	u32 counter_high; // 0 due to 64 bit
+	u64 reserved5;
+	u64 timer0; // enum hpet_timer
+	u64 timer_comparator0; // In femtoseconds
+} PACKED;
+
+/**
+ * RSDP
+ */
+
+struct rsdp {
+	struct sdp_header header;
+	struct rsdt *rsdt;
+};
+
+struct madt *madt;
+struct fadt *fadt;
+struct hpet *hpet;
+
+void acpi_install(void);
+void hpet_install(u32 period);
+void madt_install(void);
+
+#endif