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-rw-r--r--cpu-defs.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/cpu-defs.h b/cpu-defs.h
index 674c0bd3fb..0b49c89913 100644
--- a/cpu-defs.h
+++ b/cpu-defs.h
@@ -80,6 +80,14 @@ typedef unsigned long ram_addr_t;
#define TB_JMP_CACHE_BITS 12
#define TB_JMP_CACHE_SIZE (1 << TB_JMP_CACHE_BITS)
+/* Only the bottom TB_JMP_PAGE_BITS of the jump cache hash bits vary for
+ addresses on the same page. The top bits are the same. This allows
+ TLB invalidation to quickly clear a subset of the hash table. */
+#define TB_JMP_PAGE_BITS (TB_JMP_CACHE_BITS / 2)
+#define TB_JMP_PAGE_SIZE (1 << TB_JMP_PAGE_BITS)
+#define TB_JMP_ADDR_MASK (TB_JMP_PAGE_SIZE - 1)
+#define TB_JMP_PAGE_MASK (TB_JMP_CACHE_SIZE - TB_JMP_PAGE_SIZE)
+
#define CPU_TLB_BITS 8
#define CPU_TLB_SIZE (1 << CPU_TLB_BITS)