x86/x86_64/fred.rst

1 .. SPDX-License-Identifier: GPL-2.0
11 privilege level (ring transitions). The FRED architecture was
20    establishes the full supervisor context and that event return
33 The LKGS instruction can be used by 64-bit operating systems that do
46 framework must be implemented to facilitate the event-to-handler
48 once an event is delivered, and employs a two-level dispatch.
50 The first level dispatching is event type based, and the second level
53 Full supervisor/user context
56 FRED event delivery atomically save and restore full supervisor/user
86 event handling, and each stack level should be configured to use a
89 The current stack level could be unchanged or go higher upon FRED
92 the MSR of the new stack level, i.e., MSR_IA32_FRED_RSP[123].
95 current stack level, causing the CPU to switch back to the stack it was
96 on before a previous event delivery that promoted the stack level.