diff mbox series

[1/7] exec: Use TARGET_PAGE_BITS_MIN for TLB flags

Message ID 20190919232952.6382-2-richard.henderson@linaro.org
State New
Headers show
Series exec: Improve code for TARGET_PAGE_BITS_VARY | expand

Commit Message

Richard Henderson Sept. 19, 2019, 11:29 p.m. UTC 
These bits do not need to vary with the actual page size
used by the guest.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 include/exec/cpu-all.h | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index d2d443c4f9..e0c8dc540c 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -317,20 +317,24 @@  CPUArchState *cpu_copy(CPUArchState *env);
 
 #if !defined(CONFIG_USER_ONLY)
 
-/* Flags stored in the low bits of the TLB virtual address.  These are
- * defined so that fast path ram access is all zeros.
+/*
+ * Flags stored in the low bits of the TLB virtual address.
+ * These are defined so that fast path ram access is all zeros.
  * The flags all must be between TARGET_PAGE_BITS and
  * maximum address alignment bit.
+ *
+ * Use TARGET_PAGE_BITS_MIN so that these bits are constant
+ * when TARGET_PAGE_BITS_VARY is in effect.
  */
 /* Zero if TLB entry is valid.  */
-#define TLB_INVALID_MASK    (1 << (TARGET_PAGE_BITS - 1))
+#define TLB_INVALID_MASK    (1 << (TARGET_PAGE_BITS_MIN - 1))
 /* Set if TLB entry references a clean RAM page.  The iotlb entry will
    contain the page physical address.  */
-#define TLB_NOTDIRTY        (1 << (TARGET_PAGE_BITS - 2))
+#define TLB_NOTDIRTY        (1 << (TARGET_PAGE_BITS_MIN - 2))
 /* Set if TLB entry is an IO callback.  */
-#define TLB_MMIO            (1 << (TARGET_PAGE_BITS - 3))
+#define TLB_MMIO            (1 << (TARGET_PAGE_BITS_MIN - 3))
 /* Set if TLB entry contains a watchpoint.  */
-#define TLB_WATCHPOINT      (1 << (TARGET_PAGE_BITS - 4))
+#define TLB_WATCHPOINT      (1 << (TARGET_PAGE_BITS_MIN - 4))
 
 /* Use this mask to check interception with an alignment mask
  * in a TCG backend.