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authorMarcelo Tosatti <marcelo.tosatti@cyclades.com>2005-07-27 11:44:08 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-27 16:25:55 -0700
commit3a1ce8aa2d9611a779c308fbf332ae86217b0df6 (patch)
treea757869e15047111494e5e2b24f8c755ff781ca4
parent13e886c3b435d14668aefaed449d8d7ca6dce3a8 (diff)
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[PATCH] ppc32: 8xx: update DataTLBMiss exception comment
On PPC 8xx, the DataTLBMiss handler does not jump directly to the page fault handler, as was the case in v2.4. It instead loads an invalid TLB which causes a subsequent DataTLBError exception. The comment on top of it haven't been update to reflect the change, though. Signed-off-by: Marcelo Tosatti <marcelo.tosatti@cyclades.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/ppc/kernel/head_8xx.S12
1 files changed, 5 insertions, 7 deletions
diff --git a/arch/ppc/kernel/head_8xx.S b/arch/ppc/kernel/head_8xx.S
index 5a7a64e..eb18cad 100644
--- a/arch/ppc/kernel/head_8xx.S
+++ b/arch/ppc/kernel/head_8xx.S
@@ -288,13 +288,11 @@ SystemCall:
* For the MPC8xx, this is a software tablewalk to load the instruction
* TLB. It is modelled after the example in the Motorola manual. The task
* switch loads the M_TWB register with the pointer to the first level table.
- * If we discover there is no second level table (the value is zero), the
- * plan was to load that into the TLB, which causes another fault into the
- * TLB Error interrupt where we can handle such problems. However, that did
- * not work, so if we discover there is no second level table, we restore
- * registers and branch to the error exception. We have to use the MD_xxx
- * registers for the tablewalk because the equivalent MI_xxx registers
- * only perform the attribute functions.
+ * If we discover there is no second level table (value is zero) or if there
+ * is an invalid pte, we load that into the TLB, which causes another fault
+ * into the TLB Error interrupt where we can handle such problems.
+ * We have to use the MD_xxx registers for the tablewalk because the
+ * equivalent MI_xxx registers only perform the attribute functions.
*/
InstructionTLBMiss:
#ifdef CONFIG_8xx_CPU6
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