FUJITSU Implementation Supplement Fujitsu SPARC64 V - Manual (Page 111)

100 SPARC JPS1 Implementation Supplement: Fujitsu SPARC64 V • Release 1.0, 1 July 2002
ISFSR is updated either upon a occurrence of a fast_instruction_access_MMU_miss , an
instruction_access_exception , or an instruction_access_error trap. TABLE F-7 shows the
detailed update policy of each field, and TABLE F-8 describes the fields.
TABLE F-7 ISFSR Update Policy
Field TLB#, index FV OW PR, CT 1
1.
The value of ISFSR.CT is 11 when the ASI is not a translating ASI. The value 11 is recorded in ISFSR.CT for
an illegal value in the ASI (00
16
–03
16
, 12
16
–13
16
, 16
16
–17
16
, 1A
16
–1B
16
, 1E
16
–23
16
, 2D
16
–2F
16
, and
35
16
–3B
16
).
FT TM ASI
UE, UPA,
mITLB, NC
2
2. Valid only for the instruction_access_error caused by ISFSR.UE or ISFSR.UPA .
Fresh fault or miss
3
3. Types: 0 – logical 0; 1 –logical 1; V– Valid field to be updated; “—” – not a valid field
Miss MMU miss — 0 0 V — 1 — —
Exception Access exception — 1 0 V V 0 V —
Error Access error V 4
4.
Updated when mITLB is signified.
1 0 V — 0 V V
Overwrite policy 5
5. Types: 0 – logical 0; 1 – logical 1; K – keep; U – Update as per fault/miss
Error on exception U
4
1 1 U K K U U
Exception on error K 1 1 U U K U K
Error on miss U 1 K U K 1 U U
Exception on miss K 1 K U U 1 U K
Miss on exception/error K 1 K K K 1 K K
Miss on miss K K K U K 1 K K
TABLE F-8 D-SFSR Bit Description (1 of 3)
Bits Field Name RW Description
Data <63:62> TLB# R/W Faulty TLB# log. Recorded upon an mDTLB error to identify the faulty TLB
( fDTLB : 00
2
or sDTLB : 10
2
). The priority of error logging for multiple error
conditions (parity error and multiple-hit error) is as follows:
fTLB parity high
sTLB parity
sTLB multihit
fTLB multihit
low
Data <59:49> index R/W Faulty TLB index log. Recorded upon an mDTLB error. Index number for
the faulty TLB. The priority of error logging for multiple error conditions
(parity error and multiple-hit error) is as follows:
fTLB parity high
sTLB parity
sTLB-multihit
fTLB-multihit
low
The smaller index number is selected for multiple hits.