AMD Confidential
User Manual November 21
st
, 2008
Appendix A 221
Return from interrupt (32-bit operand size).
Return from interrupt (64-bit operand size).
Reads the GDT/LDT descriptor referenced by
the 16-bit source operand masks the
attributes with FF00h and saves the result
in the 16-bit destination register.
Reads the GDT/LDT descriptor referenced by
the 16-bit source operand masks the
attributes with 00FFFF00h and saves the
result in the 32-bit destination register.
Reads the GDT/LDT descriptor referenced by
the 16-bit source operand, masks the
attributes with 00FFFF00h and saves the
result in the 64-bit destination register.
Loads mem16:32 into the global descriptor
table register.
Loads mem16:64 into the global descriptor
table register.
Loads mem16:32 into the interrupt descriptor
table register.
Loads mem16:64 into the interrupt descriptor
table register.
Load the 16-bit segment selector into the
local descriptor table register and load the
LDT descriptor from the GDT.
Loads the lower 4 bits of the source into
the lower 4 bits of CR0.
Loads a 16-bit general-purpose register with
the segment limit or a selector specified in
a 16-bit memory or register operand.
Loads a 32-bit general-purpose register with
the segment limit or a selector specified in
a 16-bit memory or register operand.
Loads a 64-bit general-purpose register with
the segment limit or a selector specified in
a 16-bit memory or register operand.
Load the 16-bit segment selector into the
task register and load the TSS descriptor
from the GDT.
Move the contents of a 32-bit register to
CRn.
Move the contents of a 64-bit register to
CRn.
Move the contents of CRn to a 32-bit
register.
Move the contents of CRn to a 64-bit
register.
Move the contents of a 32-bit register to
DRn.
Move the contents of a 64-bit register to
DRn.
Move the contents of DRn to a 32-bit
register.
Move the contents of DRn to a 64-bit
register.
Copy MSR specified by ECX into EDX:EAX.
Copy the performance monitor counter
specified by ECX into EDX:EAX.
Copy the time-stamp counter into EDX:EAX.
Resume operation of an interrupted program.
1
See Section A.6.3.2, “IRET – Return from Interrupt”, on page 225.
