SetupDesignGuide.pdf - Firmware Encoding Index

Setup Design Guide
DRAFT
// control function like SYSREQUEST
//
#define PRINT_MODIFIER
#define SYS_REQUEST_MODIFIER
#define SCROLL_LOCK_MODIFIER
#define PAUSE_MODIFIER
#define BREAK_MODIFIER
0x0023
0x0024
0x0025
0x0026
0x0027
9.3 Keyboard Layout Switching
The need for switching from one keyboard layout to another is a very common implementation. A
typical example would be for a user who needed to type in a language that did not have certain keys
exposed (e.g. Typical Hebrew layout has no Latin characters). For these types of configurations, it
would be common for the system to be aware of two completely different keyboard layouts and allow a
hot key to switch between the default and the alternate layout.
The way this would work in our given implementation would be that the firmware has some built-in
keyboard layout. A driver installs the Hebrew layout. The user needs to switch modes and hits a hot
key that forces the keyboard driver to switch from the Hebrew layout to the firmware’s Default layout.
Hit the hot key again and the user mode switches again and the keyboard driver is now pointing to the
Hebrew layout.
//
// To enable the ability to define what key combinations
// designate a special function one could do some of the
// following to allow for this flexibility.
//
//
// This assumes that the driver implementation will not
// assign a key definition if one of the following modifier
// values is presented.
//
#define LAYOUT_SWITCH_MODIFIER
0x0028
#define LAYOUT_SWITCH_DEPENDENCY_MODIFIER 0x0029
Layout = {
EfiKeyLCtrl, 0, 0, 0, 0, LAYOUT_SWITCH_MODIFIER,
EfiKeyLShift, 0, 0, 0, 0, LAYOUT_SWITCH_DEPENDENCY_MODIFIER
}
9.4 Dead Keys
Dead keys are a concept that provides the ability to OR together an accent key and another printable
character. Dead keys would be defined as a special type of Modifier character. They are typically
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