BasicHpet Class Reference

#include <hpet.h>

Inheritance diagram for BasicHpet:

Classes
struct	HostHpetRegister
struct	HostHpetTimer

Public Types
enum	{   ENABLE_CNF = (1U << 0), LEG_RT_CNF = (1U << 1), LEG_RT_CAP = (1U << 15), BIT64_CAP = (1U << 13),   FSB_INT_DEL_CAP = (1U << 15), FSB_INT_EN_CNF = (1U << 14), MODE32_CNF = (1U << 8), PER_INT_CAP = (1U << 4),   TYPE_CNF = (1U << 3), INT_ENB_CNF = (1U << 2), INT_TYPE_CNF = (1U << 1) }

Static Public Member Functions
static unsigned long	get_hpet_address (DBus< MessageAcpi > &bus_acpi)
	Get the HPET address from the ACPI table.
static uint16	get_hpet_rid (DBus< MessageAcpi > &bus_acpi, unsigned block, unsigned comparator)
	Try to find out HPET routing ID.
static bool	check_hpet_present (void *address, unsigned timer, unsigned irq)
	Check whether some address points to an hpet.

Member Enumeration Documentation

anonymous enum

Enumerator:

ENABLE_CNF
LEG_RT_CNF
LEG_RT_CAP
BIT64_CAP
FSB_INT_DEL_CAP
FSB_INT_EN_CNF
MODE32_CNF
PER_INT_CAP
TYPE_CNF
INT_ENB_CNF
INT_TYPE_CNF

Member Function Documentation

static bool BasicHpet::check_hpet_present ( void *  address, unsigned  timer, unsigned  irq  )

inlinestatic

Check whether some address points to an hpet.

static unsigned long BasicHpet::get_hpet_address ( DBus< MessageAcpi > &  bus_acpi )

inlinestatic

Get the HPET address from the ACPI table.

Returns 0 on failure.

static uint16 BasicHpet::get_hpet_rid ( DBus< MessageAcpi > &  bus_acpi, unsigned  block, unsigned  comparator  )

inlinestatic

Try to find out HPET routing ID.

Returns 0 on failure.

HPET routing IDs are stored in the DMAR table and we need them for interrupt remapping to work. This method is complicated by weird BIOSes that give each comparator its own RID. Our heuristic is to check, whether we see multiple device scope entries per ID. If this is the case, we assume that each comparator has a different RID.

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The documentation for this class was generated from the following file:

• base/include/host/hpet.h