SetupDesignGuide.pdf - Firmware Encoding Index

Setup Design Guide
DRAFT
7.3 EFI Form Callback Protocol
Summary
The EFI_FORM_CALLBACK_PROTOCOL is the defined interface for access to custom NV storage
devices as well as communication of user selections in a more interactive environment. This protocol
should be published by hardware specific drivers which want to export access to custom hardware
storage or publish IFR which has a requirement to call back the original driver.
GUID
#define EFI_FORM_CALLBACK_PROTOCOL_GUID \
{ 0xf3e4543d, 0xcf35, 0x6cef, 0x35, 0xc4, 0x4f, 0xe6, \
0x34, 0x4d, 0xfc, 0x54 }
Protocol Interface Structure
typedef struct _EFI_FORM_CALLBACK_PROTOCOL {
EFI_NV_READ
NvRead;
EFI_NV_WRITE
NvWrite;
EFI_FORM_CALLBACK
Callback;
} EFI_FORM_CALLBACK_PROTOCOL;
Parameters
Read
Write
Callback
This is the read operation to access the NV data serviced by a
hardware specific driver.
This is the write operation to access the NV data serviced by a
hardware specific driver.
This is the function that is called from the configuration browser to
communicate key value pairs.
Description
This is the interface that is provided by hardware specific drivers that control access to non-system NV
storage and support callbacks from the browser or HII.
72