LAPIC::IPI Namespace Reference

Inter-Processor Interrupts. More...

Classes
union	InterruptCommand
	Interrupt Command. More...

Enumerations
enum	DeliveryMode {   FIXED = 0 , LOWEST_PRIORITY = 1 , SMI = 2 , NMI = 4 ,   INIT = 5 , INIT_LEVEL_DEASSERT = 5 , STARTUP = 6 }
	Delivery mode specifies the type of interrupt sent to the CPU. More...
enum	DestinationMode { PHYSICAL = 0 , LOGICAL = 1 }
	Way of interpreting the value written to the destination field. More...
enum	DeliveryStatus { IDLE = 0 , SEND_PENDING = 1 }
	Interrupt state. More...
enum	Level { DEASSERT = 0 , ASSERT = 1 }
	Interrupt level. More...
enum	TriggerMode { EDGE_TRIGGERED = 0 , LEVEL_TRIGGERED = 1 }
	Trigger mode for DeliveryMode::INIT_LEVEL_DEASSERT. More...
enum	DestinationShorthand { NO_SHORTHAND = 0 , SELF = 1 , ALL_INCLUDING_SELF = 2 , ALL_EXCLUDING_SELF = 3 }
	Shorthand for commonly used destinations. More...
enum	InterruptMask { UNMASKED = 0 , MASKED = 1 }
	Interrupt mask. More...

Functions
bool	isDelivered ()
	Check if the previously sent IPI has reached its destination.
void	send (uint8_t destination, uint8_t vector)
	Send an Inter-Processor Interrupt (IPI)
void	sendGroup (uint8_t logical_destination, uint8_t vector)
	Send an Inter-Processor Interrupt (IPI) to a group of processors.
void	sendAll (uint8_t vector)
	Send an Inter-Processor Interrupt (IPI) to all processors (including self)
void	sendOthers (uint8_t vector)
	Send an Inter-Processor Interrupt (IPI) to all other processors (all but self)
void	sendInit (bool assert=true)
	Send an INIT request IPI to all other processors.
void	sendStartup (uint8_t vector)
	Send an Startup IPI to all other processors.

Detailed Description

Inter-Processor Interrupts.

For multi-core systems, the LAPIC enables sending messages (Inter-Processor Interrupts, IPIs) to other CPU cores and receiving those sent from other cores.

See also

ISDMv3 10.6 Issuing Interprocessor Interrupts

Enumeration Type Documentation

DeliveryMode

enum LAPIC::IPI::DeliveryMode

Delivery mode specifies the type of interrupt sent to the CPU.

Enumerator
FIXED	"ordinary" interrupt; send to ALL cores listed in the destination bit mask
LOWEST_PRIORITY	"ordinary" interrupt; send to the lowest priority core from destination mask
SMI	System Management Interrupt; vector number required to be 0.
NMI	Non-Maskable Interrupt, vector number ignored, only edge triggered.
INIT	Initialization interrupt (always treated as edge triggered)
INIT_LEVEL_DEASSERT	Synchronization interrupt.
STARTUP	Dedicated Startup-Interrupt (SIPI)

DeliveryStatus

enum LAPIC::IPI::DeliveryStatus

Interrupt state.

Enumerator
IDLE	No activity for this interrupt.
SEND_PENDING	Interrupt will be sent as soon as the bus / LAPIC is ready.

DestinationMode

enum LAPIC::IPI::DestinationMode

Way of interpreting the value written to the destination field.

Enumerator
PHYSICAL	Destination contains the physical destination APIC ID.
LOGICAL	Destination contains a mask of logical APIC IDs.

DestinationShorthand

enum LAPIC::IPI::DestinationShorthand

Shorthand for commonly used destinations.

Enumerator
NO_SHORTHAND	Use destination field instead of shorthand.
SELF	Send IPI to self.
ALL_INCLUDING_SELF	Send IPI to all including self.
ALL_EXCLUDING_SELF	Send IPI to all except self.

InterruptMask

enum LAPIC::IPI::InterruptMask

Interrupt mask.

Enumerator
UNMASKED	Interrupt entry is active (non-masked)
MASKED	Interrupt entry is deactivated (masked)

Level

enum LAPIC::IPI::Level

Interrupt level.

Enumerator
DEASSERT	Must be zero when DeliveryMode::INIT_LEVEL_DEASSERT.
ASSERT	Must be one for all other delivery modes.

TriggerMode

enum LAPIC::IPI::TriggerMode

Trigger mode for DeliveryMode::INIT_LEVEL_DEASSERT.

Enumerator
EDGE_TRIGGERED	edge triggered
LEVEL_TRIGGERED	level triggered

Function Documentation

isDelivered()

bool LAPIC::IPI::isDelivered

(

)

Check if the previously sent IPI has reached its destination.

Returns

true if the previous IPI was accepted from its target processor, otherwise false

send()

void LAPIC::IPI::send	(	uint8_t	destination,
		uint8_t	vector
	)

Send an Inter-Processor Interrupt (IPI)

Parameters

destination	ID of the target processor (use APIC::getLAPICID(core) )
vector	Interrupt vector number to be triggered

sendAll()

void LAPIC::IPI::sendAll

(

uint8_t

vector

)

Send an Inter-Processor Interrupt (IPI) to all processors (including self)

Parameters

vector

Interrupt vector number to be triggered

sendGroup()

void LAPIC::IPI::sendGroup	(	uint8_t	logical_destination,
		uint8_t	vector
	)

Send an Inter-Processor Interrupt (IPI) to a group of processors.

Parameters

logical_destination	Mask containing the logical APIC IDs of the target processors (use APIC::getLogicalLAPICID())
vector	Interrupt vector number to be triggered

sendInit()

void LAPIC::IPI::sendInit

(

bool

assert = true

)

Send an INIT request IPI to all other processors.

Note

Only required for startup

Parameters

assert

if true send an INIT, on false send an INIT Level De-assert

sendOthers()

void LAPIC::IPI::sendOthers

(

uint8_t

vector

)

Send an Inter-Processor Interrupt (IPI) to all other processors (all but self)

Parameters

vector

Interrupt vector number to be triggered

sendStartup()

void LAPIC::IPI::sendStartup

(

uint8_t

vector

)

Send an Startup IPI to all other processors.

Note

Only required for startup

Parameters

vector

Pointer to a startup routine