
Volume 3: Instruction Reference
3:269
ttag
ttag — Translation Hashed Entry Tag
Format:
(
qp
) ttag
r
1
=
r
3
Description:
A tag used for matching during searches of the long format Virtual Hashed Page Table
(VHPT) is generated and placed in GR
r
1
. The virtual address is specified by GR
r
3
and
the region register selected by GR
r
3
bits {63:61}.
If
ttag
is given a NaT input argument or an unimplemented virtual address as an input,
the resulting target register value is undefined, and its NaT bit is set to one.
The tag generation function generates an implementation-specific long format VHPT
tag. The tag generation function must use all implemented region bits and only virtual
address bits {60:0}. PTA.vf is ignored by this instruction.
A translation in the long format VHPT must be uniquely identified by its hash index
generated by the
thash
instruction and the tag produced from this instruction.
This instruction must be implemented on all processor models, even processor models
that do not implement a VHPT walker.
This instruction can only be executed when PSR.vm is 0.
Operation:
if (PR[
qp
]) {
check_target_register(
r
1
);
if (PSR.vm == 1)
virtualization_fault();
if (GR[
r
3
].nat || unimplemented_virtual_address(GR[
r
3
], PSR.vm)) {
GR[
r
1
] = undefined();
GR[
r
1
].nat = 1;
} else {
tmp_vr = GR[
r
3
]{63:61};
tmp_va = GR[
r
3
]{60:0};
GR[
r
1
] = tlb_vhpt_tag(tmp_va, RR[tmp_vr].rid, RR[tmp_vr].ps);
GR[
r
1
].nat = 0;
}
}
Interruptions:
Illegal Operation fault
Virtualization fault
Содержание Itanium 9150M
Страница 1: ......
Страница 209: ...3 200 Volume 3 Instruction Reference padd Interruptions Illegal Operation fault...
Страница 301: ...3 292 Volume 3 Pseudo Code Functions Intel Itanium Architecture Software Developer s Manual Rev 2 3...
Страница 405: ...3 396 Volume 3 Resource and Dependency Semantics...
Страница 406: ...3 397 Intel Itanium Architecture Software Developer s Manual Rev 2 3 Index...
Страница 407: ...3 398 Intel Itanium Architecture Software Developer s Manual Rev 2 3...
Страница 419: ...INDEX Index 12 Index for Volumes 1 2 3 and 4...
Страница 420: ......