[POWERPC] vdso: Fixes for cache block sizes

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>

1 files changed, 29 insertions, 12 deletions

diff --git a/arch/powerpc/kernel/vdso32/cacheflush.S b/arch/powerpc/kernel/vdso32/cacheflush.S
index 9cb319992c38..1ba6feb71b31 100644
--- a/arch/powerpc/kernel/vdso32/cacheflush.S
+++ b/arch/powerpc/kernel/vdso32/cacheflush.S
@@ -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