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It's not necessary to make page tables write-through, so get rid of this

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(this was an experimental change which probably shouldn't have been
committed). I/O pages are still marked non-cacheable, however.
This commit is contained in:
dg 1994-09-02 01:29:20 +00:00
parent a8c0c50155
commit 3e20d084c8
3 changed files with 9 additions and 9 deletions
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6
sys/amd64/amd64/locore.S
View File

@ -34,7 +34,7 @@
* SUCH DAMAGE.
*
* from: @(#)locore.s 7.3 (Berkeley) 5/13/91
* $Id: locore.s,v 1.20 1994/08/13 03:49:41 wollman Exp $
* $Id: locore.s,v 1.21 1994/08/22 14:28:57 bde Exp $
*/
/*
@ -318,7 +318,7 @@ NON_GPROF_ENTRY(btext)
movl $0xa0,%ecx
1:
#endif /* BDE_DEBUGGER */
movl $PG_V|PG_KW|PG_NC_PWT,%eax /* kernel R/W, valid, cache write-through */
movl $PG_V|PG_KW,%eax /* kernel R/W, valid, cache write-through */
lea ((1+UPAGES+1)*NBPG)(%esi),%ebx /* phys addr of kernel PT base */
movl %ebx,_KPTphys-KERNBASE /* save in global */
fillkpt
@ -346,7 +346,7 @@ NON_GPROF_ENTRY(btext)
movl $(1+UPAGES+1+NKPT),%ecx /* number of PTEs */
movl %esi,%eax /* phys address of PTD */
andl $PG_FRAME,%eax /* convert to PFN, should be a NOP */
orl $PG_V|PG_KW|PG_NC_PWT,%eax /* valid, kernel read/write, cache write-though */
orl $PG_V|PG_KW,%eax /* valid, kernel read/write, cache write-though */
movl %esi,%ebx /* calculate pte offset to ptd */
shrl $PGSHIFT-2,%ebx
addl %esi,%ebx /* address of page directory */

6
sys/amd64/amd64/locore.s
View File

@ -34,7 +34,7 @@
* SUCH DAMAGE.
*
* from: @(#)locore.s 7.3 (Berkeley) 5/13/91
* $Id: locore.s,v 1.20 1994/08/13 03:49:41 wollman Exp $
* $Id: locore.s,v 1.21 1994/08/22 14:28:57 bde Exp $
*/
/*
@ -318,7 +318,7 @@ NON_GPROF_ENTRY(btext)
movl $0xa0,%ecx
1:
#endif /* BDE_DEBUGGER */
movl $PG_V|PG_KW|PG_NC_PWT,%eax /* kernel R/W, valid, cache write-through */
movl $PG_V|PG_KW,%eax /* kernel R/W, valid, cache write-through */
lea ((1+UPAGES+1)*NBPG)(%esi),%ebx /* phys addr of kernel PT base */
movl %ebx,_KPTphys-KERNBASE /* save in global */
fillkpt
@ -346,7 +346,7 @@ NON_GPROF_ENTRY(btext)
movl $(1+UPAGES+1+NKPT),%ecx /* number of PTEs */
movl %esi,%eax /* phys address of PTD */
andl $PG_FRAME,%eax /* convert to PFN, should be a NOP */
orl $PG_V|PG_KW|PG_NC_PWT,%eax /* valid, kernel read/write, cache write-though */
orl $PG_V|PG_KW,%eax /* valid, kernel read/write, cache write-though */
movl %esi,%ebx /* calculate pte offset to ptd */
shrl $PGSHIFT-2,%ebx
addl %esi,%ebx /* address of page directory */

6
sys/i386/i386/locore.s
View File

@ -34,7 +34,7 @@
* SUCH DAMAGE.
*
* from: @(#)locore.s 7.3 (Berkeley) 5/13/91
* $Id: locore.s,v 1.20 1994/08/13 03:49:41 wollman Exp $
* $Id: locore.s,v 1.21 1994/08/22 14:28:57 bde Exp $
*/
/*
@ -318,7 +318,7 @@ NON_GPROF_ENTRY(btext)
movl $0xa0,%ecx
1:
#endif /* BDE_DEBUGGER */
movl $PG_V|PG_KW|PG_NC_PWT,%eax /* kernel R/W, valid, cache write-through */
movl $PG_V|PG_KW,%eax /* kernel R/W, valid, cache write-through */
lea ((1+UPAGES+1)*NBPG)(%esi),%ebx /* phys addr of kernel PT base */
movl %ebx,_KPTphys-KERNBASE /* save in global */
fillkpt
@ -346,7 +346,7 @@ NON_GPROF_ENTRY(btext)
movl $(1+UPAGES+1+NKPT),%ecx /* number of PTEs */
movl %esi,%eax /* phys address of PTD */
andl $PG_FRAME,%eax /* convert to PFN, should be a NOP */
orl $PG_V|PG_KW|PG_NC_PWT,%eax /* valid, kernel read/write, cache write-though */
orl $PG_V|PG_KW,%eax /* valid, kernel read/write, cache write-though */
movl %esi,%ebx /* calculate pte offset to ptd */
shrl $PGSHIFT-2,%ebx
addl %esi,%ebx /* address of page directory */