HPET: Difference between revisions

struct address_structure

{

uint8_t address_space_id; // 0 - system memory, 1 - system I/O

uint8_t register_bit_width;

uint8_t register_bit_offset;

uint8_t reserved;

uint64_t address;

} __attribute__((packed));

struct description_table_header

{

char signature[4]; // 'HPET' in case of HPET table

uint32_t length;

uint8_t revision;

uint8_t checksum;

char oemid[6];

uint64_t oem_tableid;

uint32_t oem_revision;

uint32_t creator_id;

uint32_t creator_revision;

} __attribute__((packed));

struct hpet : public description_table_header

{

uint8_t hardware_rev_id;

uint8_t comparator_count:5;

uint8_t counter_size:1;

uint8_t reserved:1;

uint8_t legacy_replacement:1;

pci_vendor_t pci_vendor_id;

address_structure address;

uint8_t hpet_number;

uint16_t minimum_tick;

uint8_t page_protection;

} __attribute__((packed));