ALXD800EEXJ2VD AMD (ADVANCED MICRO DEVICES), ALXD800EEXJ2VD Datasheet - Page 642

• Manufacturer Part Number: ALXD800EEXJ2VD
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of ALXD800EEXJ2VD

• Operating Temperature (min): 0C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

8.3.4.3
Operation
IF (CPL <> 0) THEN
ELSE
Description
The above forms of the MOV instruction store the contents of a test register (either TR0, TR1, TR2, TR3, TR4, TR5, TR6,
or TR7) to a general purpose register (either EAX, ECX, EDX, EBX, ESP, EBP, ESI, or EDI), or load a test register from a
general purpose register.
Thirty-two bit operands are always used with these instructions, regardless of the operand size attribute.
Flags Affected
None.
Exceptions
#GP(0)
Notes
These are not the Intel or Geode LX processor test registers. Writing to a test register has no side effects. Reading from a
test register has no side effects.
The reg field within the ModR/M byte specifies which of the test registers is involved. Reg values of 0, 1, 2, 3, 4, 5, 6, 7
specify TR0, TR1, TR2, TR3, TR4, TR5, TR6, and TR7 respectively. The two bits in the mod field are always 11. The r/m
field specifies the general register involved.
Moving a value into a test register has no side effects.
Software other than DMI handlers should not use test registers, because DMI handlers might not preserve the contents of
test registers. DMI handlers may use test registers as a place for saving and restoring general registers when the state of
the stack is unknown.
642
Opcode
0F 24 /r
0F 26 /r
#GP(0);
DEST <= SRC;
MOV - Move to/from Test Registers
If the current privilege level is not 0.
Instruction
MOV r32,tr
MOV tr, r32
33234C
Clocks
1
2
Description
Move test register to general register
Move general register to test register
AMD Geode™ LX Processors Data Book
Instruction Set