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[Qemu-devel] [PATCH 6/9] PPC: Add dcbtls emulation

From: Alexander Graf
Subject: [Qemu-devel] [PATCH 6/9] PPC: Add dcbtls emulation
Date: Thu, 15 May 2014 18:32:47 +0200

The dcbtls instruction is able to lock data inside the L1 cache.

Unfortunately we don't emulate any caches, so we have to tell the guest
that its locking attempt failed.

However, by implementing the instruction we at least don't give the
guest a program exception which it definitely does not expect.

Signed-off-by: Alexander Graf <address@hidden>
 target-ppc/translate.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index e9e7812..0cf1417 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -4481,6 +4481,17 @@ static void gen_dcbtst(DisasContext *ctx)
+/* dcbtls */
+static void gen_dcbtls(DisasContext *ctx)
+    /* Always fails locking the cache */
+    TCGv t0 = tcg_temp_new();
+    gen_load_spr(t0, SPR_Exxx_L1CSR0);
+    tcg_gen_ori_tl(t0, t0, L1CSR0_CUL);
+    gen_store_spr(SPR_Exxx_L1CSR0, t0);
+    tcg_temp_free(t0);
 /* dcbz */
 static void gen_dcbz(DisasContext *ctx)
@@ -10215,6 +10226,7 @@ GEN_HANDLER(dcbi, 0x1F, 0x16, 0x0E, 0x03E00001, 
 GEN_HANDLER(dcbst, 0x1F, 0x16, 0x01, 0x03E00001, PPC_CACHE),
 GEN_HANDLER(dcbt, 0x1F, 0x16, 0x08, 0x00000001, PPC_CACHE),
 GEN_HANDLER(dcbtst, 0x1F, 0x16, 0x07, 0x00000001, PPC_CACHE),
+GEN_HANDLER_E(dcbtls, 0x1F, 0x06, 0x05, 0x02000001, PPC_BOOKE, PPC2_BOOKE206),
 GEN_HANDLER(dcbz, 0x1F, 0x16, 0x1F, 0x03C00001, PPC_CACHE_DCBZ),
 GEN_HANDLER(dst, 0x1F, 0x16, 0x0A, 0x01800001, PPC_ALTIVEC),
 GEN_HANDLER(dstst, 0x1F, 0x16, 0x0B, 0x02000001, PPC_ALTIVEC),

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