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authorArtyom Tarasenko <atar4qemu@gmail.com>2016-01-26 14:42:50 +0100
committerArtyom Tarasenko <atar4qemu@gmail.com>2017-01-18 22:03:44 +0100
commit4797a6851975c1239df440c5f01d8566e63717bb (patch)
tree01c8a56e0def240f3f5c856b72c05468ffbb5381
parent2f1b52920205863024cc86007e88557f4c2c898e (diff)
target-sparc: replace the last tlb entry when no free entries left
Implement the behavior described in the chapter 13.9.11 of UltraSPARC T1™ Supplement to the UltraSPARC Architecture 2005: "If a TLB Data-In replacement is attempted with all TLB entries locked and valid, the last TLB entry (entry 63) is replaced." Signed-off-by: Artyom Tarasenko <atar4qemu@gmail.com>
-rw-r--r--target/sparc/ldst_helper.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/target/sparc/ldst_helper.c b/target/sparc/ldst_helper.c
index d3747cf0f2..029120d1a0 100644
--- a/target/sparc/ldst_helper.c
+++ b/target/sparc/ldst_helper.c
@@ -246,9 +246,11 @@ static void replace_tlb_1bit_lru(SparcTLBEntry *tlb,
}
#ifdef DEBUG_MMU
- DPRINTF_MMU("%s lru replacement failed: no entries available\n", strmmu);
+ DPRINTF_MMU("%s lru replacement: no free entries available, "
+ "replacing the last one\n", strmmu);
#endif
- /* error state? */
+ /* corner case: the last entry is replaced anyway */
+ replace_tlb_entry(&tlb[63], tlb_tag, tlb_tte, env1);
}
#endif