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cdf2c465
编写于
11月 18, 2005
作者:
L
Linus Torvalds
浏览文件
操作
浏览文件
下载
差异文件
Merge branch 'release' of
git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
上级
fc71fe40
e8aabc47
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
71 addition
and
62 deletion
+71
-62
arch/ia64/kernel/ivt.S
arch/ia64/kernel/ivt.S
+71
-62
未找到文件。
arch/ia64/kernel/ivt.S
浏览文件 @
cdf2c465
...
...
@@ -91,16 +91,17 @@ ENTRY(vhpt_miss)
*
(
the
"original"
)
TLB
miss
,
which
may
either
be
caused
by
an
instruction
*
fetch
or
a
data
access
(
or
non
-
access
)
.
*
*
What
we
do
here
is
normal
TLB
miss
handing
for
the
_original_
miss
,
followed
*
by
inserting
the
TLB
entry
for
the
virtual
page
table
page
that
the
VHPT
*
walker
was
attempting
to
access
.
The
latter
gets
inserted
as
long
*
as
both
L1
and
L2
have
valid
mappings
for
the
faulting
address
.
*
The
TLB
entry
for
the
original
miss
gets
inserted
only
if
*
the
L3
entry
indicates
that
the
page
is
present
.
*
What
we
do
here
is
normal
TLB
miss
handing
for
the
_original_
miss
,
*
followed
by
inserting
the
TLB
entry
for
the
virtual
page
table
page
*
that
the
VHPT
walker
was
attempting
to
access
.
The
latter
gets
*
inserted
as
long
as
page
table
entry
above
pte
level
have
valid
*
mappings
for
the
faulting
address
.
The
TLB
entry
for
the
original
*
miss
gets
inserted
only
if
the
pte
entry
indicates
that
the
page
is
*
present
.
*
*
do_page_fault
gets
invoked
in
the
following
cases
:
*
-
the
faulting
virtual
address
uses
unimplemented
address
bits
*
-
the
faulting
virtual
address
has
no
L1
,
L2
,
or
L3
mapping
*
-
the
faulting
virtual
address
has
no
valid
page
table
mapping
*/
mov
r16
=
cr
.
ifa
//
get
address
that
caused
the
TLB
miss
#ifdef CONFIG_HUGETLB_PAGE
...
...
@@ -126,7 +127,7 @@ ENTRY(vhpt_miss)
#endif
;;
cmp.eq
p6
,
p7
=
5
,
r17
//
is
IFA
pointing
into
to
region
5
?
shr.u
r18
=
r22
,
PGDIR_SHIFT
//
get
b
its
33
-
63
of
the
faulting
address
shr.u
r18
=
r22
,
PGDIR_SHIFT
//
get
b
ottom
portion
of
pgd
index
bit
;;
(
p7
)
dep
r17
=
r17
,
r19
,(
PAGE_SHIFT
-
3
),
3
//
put
region
number
bits
in
place
...
...
@@ -137,38 +138,38 @@ ENTRY(vhpt_miss)
(
p6
)
shr.u
r21
=
r21
,
PGDIR_SHIFT
+
PAGE_SHIFT
(
p7
)
shr.u
r21
=
r21
,
PGDIR_SHIFT
+
PAGE_SHIFT
-
3
;;
(
p6
)
dep
r17
=
r18
,
r19
,
3
,(
PAGE_SHIFT
-
3
)
//
r17
=
PTA
+
IFA
(
33
,
42
)*
8
(
p7
)
dep
r17
=
r18
,
r17
,
3
,(
PAGE_SHIFT
-
6
)
//
r17
=
PTA
+
(((
IFA
(
61
,
63
)
<<
7
)
|
IFA
(
33
,
39
))*
8
)
(
p6
)
dep
r17
=
r18
,
r19
,
3
,(
PAGE_SHIFT
-
3
)
//
r17
=
pgd_offset
for
region
5
(
p7
)
dep
r17
=
r18
,
r17
,
3
,(
PAGE_SHIFT
-
6
)
//
r17
=
pgd_offset
for
region
[
0
-
4
]
cmp.eq
p7
,
p6
=
0
,
r21
//
unused
address
bits
all
zeroes
?
#ifdef CONFIG_PGTABLE_4
shr.u
r28
=
r22
,
PUD_SHIFT
//
shift
L2
index
into
position
shr.u
r28
=
r22
,
PUD_SHIFT
//
shift
pud
index
into
position
#else
shr.u
r18
=
r22
,
PMD_SHIFT
//
shift
L3
index
into
position
shr.u
r18
=
r22
,
PMD_SHIFT
//
shift
pmd
index
into
position
#endif
;;
ld8
r17
=[
r17
]
//
fetch
the
L1
entry
(
may
be
0
)
ld8
r17
=[
r17
]
//
get
*
pgd
(
may
be
0
)
;;
(
p7
)
cmp.eq
p6
,
p7
=
r17
,
r0
//
was
L1
entry
NULL
?
(
p7
)
cmp.eq
p6
,
p7
=
r17
,
r0
//
was
pgd_present
(*
pgd
)
==
NULL
?
#ifdef CONFIG_PGTABLE_4
dep
r28
=
r28
,
r17
,
3
,(
PAGE_SHIFT
-
3
)
//
compute
address
of
L2
page
table
entry
dep
r28
=
r28
,
r17
,
3
,(
PAGE_SHIFT
-
3
)
//
r28
=
pud_offset
(
pgd
,
addr
)
;;
shr.u
r18
=
r22
,
PMD_SHIFT
//
shift
L3
index
into
position
(
p7
)
ld8
r29
=[
r28
]
//
fetch
the
L2
entry
(
may
be
0
)
shr.u
r18
=
r22
,
PMD_SHIFT
//
shift
pmd
index
into
position
(
p7
)
ld8
r29
=[
r28
]
//
get
*
pud
(
may
be
0
)
;;
(
p7
)
cmp.eq.or.andcm
p6
,
p7
=
r29
,
r0
//
was
L2
entry
NULL
?
dep
r17
=
r18
,
r29
,
3
,(
PAGE_SHIFT
-
3
)
//
compute
address
of
L3
page
table
entry
(
p7
)
cmp.eq.or.andcm
p6
,
p7
=
r29
,
r0
//
was
pud_present
(*
pud
)
==
NULL
?
dep
r17
=
r18
,
r29
,
3
,(
PAGE_SHIFT
-
3
)
//
r17
=
pmd_offset
(
pud
,
addr
)
#else
dep
r17
=
r18
,
r17
,
3
,(
PAGE_SHIFT
-
3
)
//
compute
address
of
L3
page
table
entry
dep
r17
=
r18
,
r17
,
3
,(
PAGE_SHIFT
-
3
)
//
r17
=
pmd_offset
(
pgd
,
addr
)
#endif
;;
(
p7
)
ld8
r20
=[
r17
]
//
fetch
the
L3
entry
(
may
be
0
)
shr.u
r19
=
r22
,
PAGE_SHIFT
//
shift
L4
index
into
position
(
p7
)
ld8
r20
=[
r17
]
//
get
*
pmd
(
may
be
0
)
shr.u
r19
=
r22
,
PAGE_SHIFT
//
shift
pte
index
into
position
;;
(
p7
)
cmp.eq.or.andcm
p6
,
p7
=
r20
,
r0
//
was
L3
entry
NULL
?
dep
r21
=
r19
,
r20
,
3
,(
PAGE_SHIFT
-
3
)
//
compute
address
of
L4
page
table
entry
(
p7
)
cmp.eq.or.andcm
p6
,
p7
=
r20
,
r0
//
was
pmd_present
(*
pmd
)
==
NULL
?
dep
r21
=
r19
,
r20
,
3
,(
PAGE_SHIFT
-
3
)
//
r21
=
pte_offset
(
pmd
,
addr
)
;;
(
p7
)
ld8
r18
=[
r21
]
//
read
the
L4
PTE
mov
r19
=
cr
.
isr
//
cr
.
isr
bit
0
tells
us
if
this
is
an
insn
miss
(
p7
)
ld8
r18
=[
r21
]
//
read
*
pte
mov
r19
=
cr
.
isr
//
cr
.
isr
bit
32
tells
us
if
this
is
an
insn
miss
;;
(
p7
)
tbit.z
p6
,
p7
=
r18
,
_PAGE_P_BIT
//
page
present
bit
cleared
?
mov
r22
=
cr
.
iha
//
get
the
VHPT
address
that
caused
the
TLB
miss
...
...
@@ -202,25 +203,33 @@ ENTRY(vhpt_miss)
dv_serialize_data
/
*
*
Re
-
check
L2
and
L3
pagetable
.
If
they
changed
,
we
may
have
received
a
ptc
.
g
*
Re
-
check
pagetable
entry
.
If
they
changed
,
we
may
have
received
a
ptc
.
g
*
between
reading
the
pagetable
and
the
"itc"
.
If
so
,
flush
the
entry
we
*
inserted
and
retry
.
*
inserted
and
retry
.
At
this
point
,
we
have
:
*
*
r28
=
equivalent
of
pud_offset
(
pgd
,
ifa
)
*
r17
=
equivalent
of
pmd_offset
(
pud
,
ifa
)
*
r21
=
equivalent
of
pte_offset
(
pmd
,
ifa
)
*
*
r29
=
*
pud
*
r20
=
*
pmd
*
r18
=
*
pte
*/
ld8
r25
=[
r21
]
//
read
L4
entry
again
ld8
r26
=[
r17
]
//
read
L3
PTE
again
ld8
r25
=[
r21
]
//
read
*
pte
again
ld8
r26
=[
r17
]
//
read
*
pmd
again
#ifdef CONFIG_PGTABLE_4
ld8
r1
8
=[
r28
]
//
read
L2
entry
again
ld8
r1
9
=[
r28
]
//
read
*
pud
again
#endif
cmp.ne
p6
,
p7
=
r0
,
r0
;;
cmp.ne.or.andcm
p6
,
p7
=
r26
,
r20
//
did
L3
entry
change
cmp.ne.or.andcm
p6
,
p7
=
r26
,
r20
//
did
*
pmd
change
#ifdef CONFIG_PGTABLE_4
cmp.ne.or.andcm
p6
,
p7
=
r
29
,
r18
//
did
L4
PTE
change
cmp.ne.or.andcm
p6
,
p7
=
r
19
,
r29
//
did
*
pud
change
#endif
mov
r27
=
PAGE_SHIFT
<<
2
;;
(
p6
)
ptc.l
r22
,
r27
//
purge
PTE
page
translation
(
p7
)
cmp.ne.or.andcm
p6
,
p7
=
r25
,
r18
//
did
L4
PTE
change
(
p7
)
cmp.ne.or.andcm
p6
,
p7
=
r25
,
r18
//
did
*
pte
change
;;
(
p6
)
ptc.l
r16
,
r27
//
purge
translation
#endif
...
...
@@ -235,19 +244,19 @@ END(vhpt_miss)
ENTRY
(
itlb_miss
)
DBG_FAULT
(1)
/
*
*
The
ITLB
handler
accesses
the
L3
PTE
via
the
virtually
mapped
linear
*
The
ITLB
handler
accesses
the
PTE
via
the
virtually
mapped
linear
*
page
table
.
If
a
nested
TLB
miss
occurs
,
we
switch
into
physical
*
mode
,
walk
the
page
table
,
and
then
re
-
execute
the
L3
PTE
rea
d
*
and
go
on
normally
after
that
.
*
mode
,
walk
the
page
table
,
and
then
re
-
execute
the
PTE
read
an
d
*
go
on
normally
after
that
.
*/
mov
r16
=
cr
.
ifa
//
get
virtual
address
mov
r29
=
b0
//
save
b0
mov
r31
=
pr
//
save
predicates
.
itlb_fault
:
mov
r17
=
cr
.
iha
//
get
virtual
address
of
L3
PTE
mov
r17
=
cr
.
iha
//
get
virtual
address
of
PTE
movl
r30
=
1
f
//
load
nested
fault
continuation
point
;;
1
:
ld8
r18
=[
r17
]
//
read
L3
PTE
1
:
ld8
r18
=[
r17
]
//
read
*
pte
;;
mov
b0
=
r29
tbit.z
p6
,
p0
=
r18
,
_PAGE_P_BIT
//
page
present
bit
cleared
?
...
...
@@ -262,7 +271,7 @@ ENTRY(itlb_miss)
*/
dv_serialize_data
ld8
r19
=[
r17
]
//
read
L3
PTE
again
and
see
if
same
ld8
r19
=[
r17
]
//
read
*
pte
again
and
see
if
same
mov
r20
=
PAGE_SHIFT
<<
2
//
setup
page
size
for
purge
;;
cmp.ne
p7
,
p0
=
r18
,
r19
...
...
@@ -279,19 +288,19 @@ END(itlb_miss)
ENTRY
(
dtlb_miss
)
DBG_FAULT
(2)
/
*
*
The
DTLB
handler
accesses
the
L3
PTE
via
the
virtually
mapped
linear
*
The
DTLB
handler
accesses
the
PTE
via
the
virtually
mapped
linear
*
page
table
.
If
a
nested
TLB
miss
occurs
,
we
switch
into
physical
*
mode
,
walk
the
page
table
,
and
then
re
-
execute
the
L3
PTE
rea
d
*
and
go
on
normally
after
that
.
*
mode
,
walk
the
page
table
,
and
then
re
-
execute
the
PTE
read
an
d
*
go
on
normally
after
that
.
*/
mov
r16
=
cr
.
ifa
//
get
virtual
address
mov
r29
=
b0
//
save
b0
mov
r31
=
pr
//
save
predicates
dtlb_fault
:
mov
r17
=
cr
.
iha
//
get
virtual
address
of
L3
PTE
mov
r17
=
cr
.
iha
//
get
virtual
address
of
PTE
movl
r30
=
1
f
//
load
nested
fault
continuation
point
;;
1
:
ld8
r18
=[
r17
]
//
read
L3
PTE
1
:
ld8
r18
=[
r17
]
//
read
*
pte
;;
mov
b0
=
r29
tbit.z
p6
,
p0
=
r18
,
_PAGE_P_BIT
//
page
present
bit
cleared
?
...
...
@@ -306,7 +315,7 @@ dtlb_fault:
*/
dv_serialize_data
ld8
r19
=[
r17
]
//
read
L3
PTE
again
and
see
if
same
ld8
r19
=[
r17
]
//
read
*
pte
again
and
see
if
same
mov
r20
=
PAGE_SHIFT
<<
2
//
setup
page
size
for
purge
;;
cmp.ne
p7
,
p0
=
r18
,
r19
...
...
@@ -420,7 +429,7 @@ ENTRY(nested_dtlb_miss)
*
r30
:
continuation
address
*
r31
:
saved
pr
*
*
Output
:
r17
:
physical
address
of
L3
PTE
of
faulting
address
*
Output
:
r17
:
physical
address
of
PTE
of
faulting
address
*
r29
:
saved
b0
*
r30
:
continuation
address
*
r31
:
saved
pr
...
...
@@ -450,33 +459,33 @@ ENTRY(nested_dtlb_miss)
(
p6
)
shr.u
r21
=
r21
,
PGDIR_SHIFT
+
PAGE_SHIFT
(
p7
)
shr.u
r21
=
r21
,
PGDIR_SHIFT
+
PAGE_SHIFT
-
3
;;
(
p6
)
dep
r17
=
r18
,
r19
,
3
,(
PAGE_SHIFT
-
3
)
//
r17
=
PTA
+
IFA
(
33
,
42
)*
8
(
p7
)
dep
r17
=
r18
,
r17
,
3
,(
PAGE_SHIFT
-
6
)
//
r17
=
PTA
+
(((
IFA
(
61
,
63
)
<<
7
)
|
IFA
(
33
,
39
))*
8
)
(
p6
)
dep
r17
=
r18
,
r19
,
3
,(
PAGE_SHIFT
-
3
)
//
r17
=
pgd_offset
for
region
5
(
p7
)
dep
r17
=
r18
,
r17
,
3
,(
PAGE_SHIFT
-
6
)
//
r17
=
pgd_offset
for
region
[
0
-
4
]
cmp.eq
p7
,
p6
=
0
,
r21
//
unused
address
bits
all
zeroes
?
#ifdef CONFIG_PGTABLE_4
shr.u
r18
=
r22
,
PUD_SHIFT
//
shift
L2
index
into
position
shr.u
r18
=
r22
,
PUD_SHIFT
//
shift
pud
index
into
position
#else
shr.u
r18
=
r22
,
PMD_SHIFT
//
shift
L3
index
into
position
shr.u
r18
=
r22
,
PMD_SHIFT
//
shift
pmd
index
into
position
#endif
;;
ld8
r17
=[
r17
]
//
fetch
the
L1
entry
(
may
be
0
)
ld8
r17
=[
r17
]
//
get
*
pgd
(
may
be
0
)
;;
(
p7
)
cmp.eq
p6
,
p7
=
r17
,
r0
//
was
L1
entry
NULL
?
dep
r17
=
r18
,
r17
,
3
,(
PAGE_SHIFT
-
3
)
//
compute
address
of
L2
page
table
entry
(
p7
)
cmp.eq
p6
,
p7
=
r17
,
r0
//
was
pgd_present
(*
pgd
)
==
NULL
?
dep
r17
=
r18
,
r17
,
3
,(
PAGE_SHIFT
-
3
)
//
r17
=
p
[
u
|
m
]
d_offset
(
pgd
,
addr
)
;;
#ifdef CONFIG_PGTABLE_4
(
p7
)
ld8
r17
=[
r17
]
//
fetch
the
L2
entry
(
may
be
0
)
shr.u
r18
=
r22
,
PMD_SHIFT
//
shift
L3
index
into
position
(
p7
)
ld8
r17
=[
r17
]
//
get
*
pud
(
may
be
0
)
shr.u
r18
=
r22
,
PMD_SHIFT
//
shift
pmd
index
into
position
;;
(
p7
)
cmp.eq.or.andcm
p6
,
p7
=
r17
,
r0
//
was
L2
entry
NULL
?
dep
r17
=
r18
,
r17
,
3
,(
PAGE_SHIFT
-
3
)
//
compute
address
of
L2
page
table
entry
(
p7
)
cmp.eq.or.andcm
p6
,
p7
=
r17
,
r0
//
was
pud_present
(*
pud
)
==
NULL
?
dep
r17
=
r18
,
r17
,
3
,(
PAGE_SHIFT
-
3
)
//
r17
=
pmd_offset
(
pud
,
addr
)
;;
#endif
(
p7
)
ld8
r17
=[
r17
]
//
fetch
the
L3
entry
(
may
be
0
)
shr.u
r19
=
r22
,
PAGE_SHIFT
//
shift
L4
index
into
position
(
p7
)
ld8
r17
=[
r17
]
//
get
*
pmd
(
may
be
0
)
shr.u
r19
=
r22
,
PAGE_SHIFT
//
shift
pte
index
into
position
;;
(
p7
)
cmp.eq.or.andcm
p6
,
p7
=
r17
,
r0
//
was
L3
entry
NULL
?
dep
r17
=
r19
,
r17
,
3
,(
PAGE_SHIFT
-
3
)
//
compute
address
of
L4
page
table
entry
(
p7
)
cmp.eq.or.andcm
p6
,
p7
=
r17
,
r0
//
was
pmd_present
(*
pmd
)
==
NULL
?
dep
r17
=
r19
,
r17
,
3
,(
PAGE_SHIFT
-
3
)
//
r17
=
pte_offset
(
pmd
,
addr
)
;
(
p6
)
br.cond.spnt
page_fault
mov
b0
=
r30
br.sptk.many
b0
//
return
to
continuation
point
...
...
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