User's Manual

TASKS AND STATE TRANSITIONS
Once access to the task gate has been verified, the TSS selector from the gate is read. The RPL of the
TSS selector is ignored. From this point, all the checks and actions performed for a JMP or CALL to
a
TSS after access has been verified are performed (see section 8.4). Figure 8-4 illustrates an example
of a task switch through a task gate.
TASK A
TASK B
f f
TAS~ {
LOT DESCRIPTOR
LOT
I
I
SELECTOR I----
TSS DESCRIPTOR
-
TASK GATE
LOT SELECTOR
t
l'
LOT
L
LOT SELECTOR
LOT DESCRIPTOR
}~ASK _
TSS DESCRIPTOR
BACK LINK
TSS
TSS
GOT
G30108
Figure 8-4. Task Switch Through a Task Gate
8-9