[Qemu-ppc] [Qemu-devel] [PATCH v4 12/15] cpu: TLB_FLAGS_MASK bit to force memory slow path

[tony.nguyen]

The fast path is taken when TLB_FLAGS_MASK is all zero.

TLB_FORCE_SLOW is simply a TLB_FLAGS_MASK bit to force the slow path,

there are no other side effects.

Signed-off-by: Tony Nguyen <address@hidden>

---

 include/exec/cpu-all.h | 10 ++++++++--

 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h

index 536ea58..e496f99 100644

--- a/include/exec/cpu-all.h

+++ b/include/exec/cpu-all.h

@@ -331,12 +331,18 @@ CPUArchState *cpu_copy(CPUArchState *env);

 #define TLB_MMIO            (1 << (TARGET_PAGE_BITS - 3))

 /* Set if TLB entry must have MMU lookup repeated for every access */

 #define TLB_RECHECK         (1 << (TARGET_PAGE_BITS - 4))

+/* Set if TLB entry must take the slow path.  */

+#define TLB_FORCE_SLOW      (1 << (TARGET_PAGE_BITS - 5))

 

 /* Use this mask to check interception with an alignment mask

  * in a TCG backend.

  */

-#define TLB_FLAGS_MASK  (TLB_INVALID_MASK | TLB_NOTDIRTY | TLB_MMIO \

-                         | TLB_RECHECK)

+#define TLB_FLAGS_MASK \

+    (TLB_INVALID_MASK  \

+     | TLB_NOTDIRTY    \

+     | TLB_MMIO        \

+     | TLB_RECHECK     \

+     | TLB_FORCE_SLOW)

 

 /**

  * tlb_hit_page: return true if page aligned @addr is a hit against the

-- 

1.8.3.1