OpenE2K/linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

powerpc/8xx: unpin all TLBs before flushing

Browse Source 
Bootloader may have pinned some TLB entries so the kernel must
unpin them before flushing TLBs with tlbia otherwise pinned TLB
entries won't get flushed

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <oss@buserror.net>
This commit is contained in:
Christophe Leroy 2016-05-17 09:02:49 +02:00 committed by Scott Wood
parent 567a16d152
commit 6264dbb98f
1 changed files with 10 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
arch/powerpc/kernel/head_8xx.S
View File

@ -797,6 +797,14 @@ start_here:
* these mappings is mapped by page tables.
*/
initial_mmu:
li r8, 0
mtspr SPRN_MI_CTR, r8 /* remove PINNED ITLB entries */
lis r10, MD_RESETVAL@h
#ifndef CONFIG_8xx_COPYBACK
oris r10, r10, MD_WTDEF@h
#endif
mtspr SPRN_MD_CTR, r10 /* remove PINNED DTLB entries */
tlbia /* Invalidate all TLB entries */
/* Always pin the first 8 MB ITLB to prevent ITLB
misses while mucking around with SRR0/SRR1 in asm
@ -807,16 +815,10 @@ initial_mmu:
mtspr SPRN_MI_CTR, r8 /* Set instruction MMU control */
#ifdef CONFIG_PIN_TLB
lis r10, (MD_RSV4I | MD_RESETVAL)@h
oris r10, r10, MD_RSV4I@h
ori r10, r10, 0x1c00
mr r8, r10
#else
lis r10, MD_RESETVAL@h
#endif
#ifndef CONFIG_8xx_COPYBACK
oris r10, r10, MD_WTDEF@h
#endif
mtspr SPRN_MD_CTR, r10 /* Set data TLB control */
#endif
/* Now map the lower 8 Meg into the TLBs. For this quick hack,
* we can load the instruction and data TLB registers with the