Intel Extensible Firmware Interface - Manual (Page 113)

Services — Boot Services
Version 1.10 12/01/02 5-15
RaiseTPL()
Summary
Raises a task’s priority level and returns its previous level.
Prototype
EFI_TPL
RaiseTPL (
IN EFI_TPL NewTpl
);
Parameters
NewTpl The new task priority level. It must be greater than or equal to the
current task priority level. See “Related Definitions.”
Related Definitions
//*******************************************************
// EFI_TPL
//*******************************************************
typedef UINTN
EFI_TPL
//*******************************************************
// Task Priority Levels
//*******************************************************
#define TPL_APPLICATION
4
#define TPL_CALLBACK 8
#define TPL_NOTIFY 16
#define TPL_HIGH_LEVEL 31