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165 lines
8.5 KiB
C
165 lines
8.5 KiB
C
/** @file
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Provides services to notify the PCI bus driver that some events have happened
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in a hot-plug controller (such as a PC Card socket, or PHPC), and to ask the
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PCI bus driver to create or destroy handles for PCI-like devices.
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A hot-plug capable PCI bus driver should produce the EFI PCI Hot Plug Request
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protocol. When a PCI device or a PCI-like device (for example, 32-bit PC Card)
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is installed after PCI bus does the enumeration, the PCI bus driver can be
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notified through this protocol. For example, when a 32-bit PC Card is inserted
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into the PC Card socket, the PC Card bus driver can call interface of this
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protocol to notify PCI bus driver to allocate resource and create handles for
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this PC Card.
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The EFI_PCI_HOTPLUG_REQUEST_PROTOCOL is installed by the PCI bus driver on a
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separate handle when PCI bus driver starts up. There is only one instance in
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the system. Any driver that wants to use this protocol must locate it globally.
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The EFI_PCI_HOTPLUG_REQUEST_PROTOCOL allows the driver of hot-plug controller,
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for example, PC Card Bus driver, to notify PCI bus driver that an event has
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happened in the hot-plug controller, and the PCI bus driver is requested to
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create (add) or destroy (remove) handles for the specified PCI-like devices.
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For example, when a 32-bit PC Card is inserted, this protocol interface will
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be called with an add operation, and the PCI bus driver will enumerate and
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start the devices inserted; when a 32-bit PC Card is removed, this protocol
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interface will be called with a remove operation, and the PCI bus driver will
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stop the devices and destroy their handles. The existence of this protocol
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represents the capability of the PCI bus driver. If this protocol exists in
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system, it means PCI bus driver is hot-plug capable, thus together with the
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effort of PC Card bus driver, hot-plug of PC Card can be supported. Otherwise,
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the hot-plug capability is not provided.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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@par Revision Reference:
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This Protocol is defined in UEFI Platform Initialization Specification 1.2
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Volume 5: Standards
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**/
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#ifndef __PCI_HOTPLUG_REQUEST_H_
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#define __PCI_HOTPLUG_REQUEST_H_
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///
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/// Global ID for EFI_PCI_HOTPLUG_REQUEST_PROTOCOL
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///
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#define EFI_PCI_HOTPLUG_REQUEST_PROTOCOL_GUID \
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{ \
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0x19cb87ab, 0x2cb9, 0x4665, {0x83, 0x60, 0xdd, 0xcf, 0x60, 0x54, 0xf7, 0x9d} \
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}
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///
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/// Forward declaration for EFI_PCI_HOTPLUG_REQUEST_PROTOCOL
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///
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typedef struct _EFI_PCI_HOTPLUG_REQUEST_PROTOCOL EFI_PCI_HOTPLUG_REQUEST_PROTOCOL;
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///
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/// Enumeration of PCI hot plug operations
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///
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typedef enum {
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///
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/// The PCI bus driver is requested to create handles for the specified devices.
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/// An array of EFI_HANDLE is returned, with a NULL element marking the end of
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/// the array.
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///
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EfiPciHotPlugRequestAdd,
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///
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/// The PCI bus driver is requested to destroy handles for the specified devices.
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///
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EfiPciHotplugRequestRemove
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} EFI_PCI_HOTPLUG_OPERATION;
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/**
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This function is used to notify PCI bus driver that some events happened in a
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hot-plug controller, and the PCI bus driver is requested to start or stop
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specified PCI-like devices.
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This function allows the PCI bus driver to be notified to act as requested when
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a hot-plug event has happened on the hot-plug controller. Currently, the
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operations include add operation and remove operation. If it is a add operation,
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the PCI bus driver will enumerate, allocate resources for devices behind the
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hot-plug controller, and create handle for the device specified by RemainingDevicePath.
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The RemainingDevicePath is an optional parameter. If it is not NULL, only the
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specified device is started; if it is NULL, all devices behind the hot-plug
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controller are started. The newly created handles of PC Card functions are
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returned in the ChildHandleBuffer, together with the number of child handle in
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NumberOfChildren. If it is a remove operation, when NumberOfChildren contains
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a non-zero value, child handles specified in ChildHandleBuffer are stopped and
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destroyed; otherwise, PCI bus driver is notified to stop managing the controller
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handle.
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@param[in] This A pointer to the EFI_PCI_HOTPLUG_REQUEST_PROTOCOL
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instance.
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@param[in] Operation The operation the PCI bus driver is requested
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to make.
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@param[in] Controller The handle of the hot-plug controller.
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@param[in] RemainingDevicePath The remaining device path for the PCI-like
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hot-plug device. It only contains device
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path nodes behind the hot-plug controller.
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It is an optional parameter and only valid
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when the Operation is a add operation. If
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it is NULL, all devices behind the PC Card
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socket are started.
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@param[in,out] NumberOfChildren The number of child handles. For an add
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operation, it is an output parameter. For
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a remove operation, it's an input parameter.
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When it contains a non-zero value, children
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handles specified in ChildHandleBuffer are
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destroyed. Otherwise, PCI bus driver is
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notified to stop managing the controller
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handle.
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@param[in,out] ChildHandleBuffer The buffer which contains the child handles.
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For an add operation, it is an output
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parameter and contains all newly created
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child handles. For a remove operation, it
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contains child handles to be destroyed when
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NumberOfChildren contains a non-zero value.
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It can be NULL when NumberOfChildren is 0.
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It's the caller's responsibility to allocate
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and free memory for this buffer.
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@retval EFI_SUCCESS The handles for the specified device have been
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created or destroyed as requested, and for an
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add operation, the new handles are returned in
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ChildHandleBuffer.
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@retval EFI_INVALID_PARAMETER Operation is not a legal value.
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@retval EFI_INVALID_PARAMETER Controller is NULL or not a valid handle.
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@retval EFI_INVALID_PARAMETER NumberOfChildren is NULL.
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@retval EFI_INVALID_PARAMETER ChildHandleBuffer is NULL while Operation is
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remove and NumberOfChildren contains a non-zero
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value.
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@retval EFI_INVALID_PARAMETER ChildHandleBuffer is NULL while Operation is add.
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@retval EFI_OUT_OF_RESOURCES There are no enough resources to start the
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devices.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_PCI_HOTPLUG_REQUEST_NOTIFY)(
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IN EFI_PCI_HOTPLUG_REQUEST_PROTOCOL *This,
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IN EFI_PCI_HOTPLUG_OPERATION Operation,
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IN EFI_HANDLE Controller,
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IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL,
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IN OUT UINT8 *NumberOfChildren,
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IN OUT EFI_HANDLE *ChildHandleBuffer
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);
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///
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/// Provides services to notify PCI bus driver that some events have happened in
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/// a hot-plug controller (for example, PC Card socket, or PHPC), and ask PCI bus
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/// driver to create or destroy handles for the PCI-like devices.
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///
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struct _EFI_PCI_HOTPLUG_REQUEST_PROTOCOL {
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///
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/// Notify the PCI bus driver that some events have happened in a hot-plug
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/// controller (for example, PC Card socket, or PHPC), and ask PCI bus driver
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/// to create or destroy handles for the PCI-like devices. See Section 0 for
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/// a detailed description.
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///
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EFI_PCI_HOTPLUG_REQUEST_NOTIFY Notify;
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};
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extern EFI_GUID gEfiPciHotPlugRequestProtocolGuid;
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#endif
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