lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[POWERPC] vdso: Fixes for cache block sizes

Browse Source 
The current VDSO implementation is hardcoded to 128 byte cache blocks,
which are only used on IBM's 64-bit processors.

Convert it to get the cache block sizes out of vdso_data instead,
similar to how the ppc64 in-kernel cache flush does it.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Olof Johansson
2007-11-20 12:24:45 +11:00
committed by Paul Mackerras
parent 92e21e79a8
commit fbe481756d
5 changed files with 81 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
arch/powerpc/kernel/vdso32/cacheflush.S
View File

@ -23,29 +23,46 @@
*
* Flushes the data cache & invalidate the instruction cache for the
* provided range [start, end[
*
* Note: all CPUs supported by this kernel have a 128 bytes cache
* line size so we don't have to peek that info from the datapage
*/
V_FUNCTION_BEGIN(__kernel_sync_dicache)
.cfi_startproc
li r5,127
andc r6,r3,r5 /* round low to line bdy */
mflr r12
.cfi_register lr,r12
mr r11,r3
bl __get_datapage@local
mtlr r12
mr r10,r3
lwz r7,CFG_DCACHE_BLOCKSZ(r10)
addi r5,r7,-1
andc r6,r11,r5 /* round low to line bdy */
subf r8,r6,r4 /* compute length */
add r8,r8,r5 /* ensure we get enough */
srwi. r8,r8,7 /* compute line count */
lwz r9,CFG_DCACHE_LOGBLOCKSZ(r10)
srw. r8,r8,r9 /* compute line count */
crclr cr0*4+so
beqlr /* nothing to do? */
mtctr r8
mr r3,r6
1: dcbst 0,r3
addi r3,r3,128
1: dcbst 0,r6
add r6,r6,r7
bdnz 1b
sync
/* Now invalidate the instruction cache */
lwz r7,CFG_ICACHE_BLOCKSZ(r10)
addi r5,r7,-1
andc r6,r11,r5 /* round low to line bdy */
subf r8,r6,r4 /* compute length */
add r8,r8,r5
lwz r9,CFG_ICACHE_LOGBLOCKSZ(r10)
srw. r8,r8,r9 /* compute line count */
crclr cr0*4+so
beqlr /* nothing to do? */
mtctr r8
1: icbi 0,r6
addi r6,r6,128
bdnz 1b
2: icbi 0,r6
add r6,r6,r7
bdnz 2b
isync
li r3,0
blr