diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h
index 953146e..8c081db 100644
--- a/target-ppc/cpu.h
+++ b/target-ppc/cpu.h
@@ -1857,10 +1857,8 @@ enum {
     PPC_CACHE          = 0x0000000200000000ULL,
     /*   icbi instruction                                                    */
     PPC_CACHE_ICBI     = 0x0000000400000000ULL,
-    /*   dcbz instruction with fixed cache line size                         */
+    /*   dcbz instruction                                                    */
     PPC_CACHE_DCBZ     = 0x0000000800000000ULL,
-    /*   dcbz instruction with tunable cache line size                       */
-    PPC_CACHE_DCBZT    = 0x0000001000000000ULL,
     /*   dcba instruction                                                    */
     PPC_CACHE_DCBA     = 0x0000002000000000ULL,
     /*   Freescale cache locking instructions                                */
@@ -1928,7 +1926,7 @@ enum {
                         | PPC_MEM_TLBIE | PPC_MEM_TLBSYNC \
                         | PPC_MEM_SYNC | PPC_MEM_EIEIO \
                         | PPC_CACHE | PPC_CACHE_ICBI \
-                        | PPC_CACHE_DCBZ | PPC_CACHE_DCBZT \
+                        | PPC_CACHE_DCBZ \
                         | PPC_CACHE_DCBA | PPC_CACHE_LOCK \
                         | PPC_EXTERN | PPC_SEGMENT | PPC_6xx_TLB \
                         | PPC_74xx_TLB | PPC_40x_TLB | PPC_SEGMENT_64B \
diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 83139d5..18e0394 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -25,8 +25,7 @@ DEF_HELPER_3(stmw, void, env, tl, i32)
 DEF_HELPER_4(lsw, void, env, tl, i32, i32)
 DEF_HELPER_5(lswx, void, env, tl, i32, i32, i32)
 DEF_HELPER_4(stsw, void, env, tl, i32, i32)
-DEF_HELPER_2(dcbz, void, env, tl)
-DEF_HELPER_2(dcbz_970, void, env, tl)
+DEF_HELPER_3(dcbz, void, env, tl, i32)
 DEF_HELPER_2(icbi, void, env, tl)
 DEF_HELPER_5(lscbx, tl, env, tl, i32, i32, i32)
 
diff --git a/target-ppc/mem_helper.c b/target-ppc/mem_helper.c
index 902b1cd..ba383c8 100644
--- a/target-ppc/mem_helper.c
+++ b/target-ppc/mem_helper.c
@@ -136,18 +136,21 @@ static void do_dcbz(CPUPPCState *env, target_ulong addr, int dcache_line_size)
     }
 }
 
-void helper_dcbz(CPUPPCState *env, target_ulong addr)
+void helper_dcbz(CPUPPCState *env, target_ulong addr, uint32_t is_dcbzl)
 {
-    do_dcbz(env, addr, env->dcache_line_size);
-}
+    int dcbz_size = env->dcache_line_size;
 
-void helper_dcbz_970(CPUPPCState *env, target_ulong addr)
-{
-    if (((env->spr[SPR_970_HID5] >> 7) & 0x3) == 1) {
-        do_dcbz(env, addr, 32);
-    } else {
-        do_dcbz(env, addr, env->dcache_line_size);
+#if !defined(CONFIG_USER_ONLY) && defined(TARGET_PPC64)
+    if (!is_dcbzl &&
+        (env->excp_model == POWERPC_EXCP_970) &&
+        ((env->spr[SPR_970_HID5] >> 7) & 0x3) == 1) {
+        dcbz_size = 32;
     }
+#endif
+
+    /* XXX add e500mc support */
+
+    do_dcbz(env, addr, dcbz_size);
 }
 
 void helper_icbi(CPUPPCState *env, target_ulong addr)
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 798b7ac..d96d1ed 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -4118,29 +4118,21 @@ static void gen_dcbtst(DisasContext *ctx)
 /* dcbz */
 static void gen_dcbz(DisasContext *ctx)
 {
-    TCGv t0;
-    gen_set_access_type(ctx, ACCESS_CACHE);
-    /* NIP cannot be restored if the memory exception comes from an helper */
-    gen_update_nip(ctx, ctx->nip - 4);
-    t0 = tcg_temp_new();
-    gen_addr_reg_index(ctx, t0);
-    gen_helper_dcbz(cpu_env, t0);
-    tcg_temp_free(t0);
-}
+    TCGv tcgv_addr;
+    TCGv_i32 tcgv_is_dcbzl;
+    int is_dcbzl = ctx->opcode & 0x00200000 ? 1 : 0;
 
-static void gen_dcbz_970(DisasContext *ctx)
-{
-    TCGv t0;
     gen_set_access_type(ctx, ACCESS_CACHE);
     /* NIP cannot be restored if the memory exception comes from an helper */
     gen_update_nip(ctx, ctx->nip - 4);
-    t0 = tcg_temp_new();
-    gen_addr_reg_index(ctx, t0);
-    if (ctx->opcode & 0x00200000)
-        gen_helper_dcbz(cpu_env, t0);
-    else
-        gen_helper_dcbz_970(cpu_env, t0);
-    tcg_temp_free(t0);
+    tcgv_addr = tcg_temp_new();
+    tcgv_is_dcbzl = tcg_const_i32(is_dcbzl);
+
+    gen_addr_reg_index(ctx, tcgv_addr);
+    gen_helper_dcbz(cpu_env, tcgv_addr, tcgv_is_dcbzl);
+
+    tcg_temp_free(tcgv_addr);
+    tcg_temp_free_i32(tcgv_is_dcbzl);
 }
 
 /* dst / dstt */
@@ -8648,8 +8640,7 @@ GEN_HANDLER(dcbi, 0x1F, 0x16, 0x0E, 0x03E00001, PPC_CACHE),
 GEN_HANDLER(dcbst, 0x1F, 0x16, 0x01, 0x03E00001, PPC_CACHE),
 GEN_HANDLER(dcbt, 0x1F, 0x16, 0x08, 0x02000001, PPC_CACHE),
 GEN_HANDLER(dcbtst, 0x1F, 0x16, 0x07, 0x02000001, PPC_CACHE),
-GEN_HANDLER(dcbz, 0x1F, 0x16, 0x1F, 0x03E00001, PPC_CACHE_DCBZ),
-GEN_HANDLER2(dcbz_970, "dcbz", 0x1F, 0x16, 0x1F, 0x03C00001, PPC_CACHE_DCBZT),
+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),
 GEN_HANDLER(dss, 0x1F, 0x16, 0x19, 0x019FF801, PPC_ALTIVEC),
diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
index e143af5..e2021c4 100644
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -6298,7 +6298,7 @@ static void init_proc_7457 (CPUPPCState *env)
                               PPC_FLOAT | PPC_FLOAT_FSEL | PPC_FLOAT_FRES |   \
                               PPC_FLOAT_FSQRT | PPC_FLOAT_FRSQRTE |           \
                               PPC_FLOAT_STFIWX |                              \
-                              PPC_CACHE | PPC_CACHE_ICBI | PPC_CACHE_DCBZT |  \
+                              PPC_CACHE | PPC_CACHE_ICBI | PPC_CACHE_DCBZ |  \
                               PPC_MEM_SYNC | PPC_MEM_EIEIO |                  \
                               PPC_MEM_TLBIE | PPC_MEM_TLBSYNC |               \
                               PPC_64B | PPC_ALTIVEC |                         \
@@ -6394,7 +6394,7 @@ static void init_proc_970 (CPUPPCState *env)
                               PPC_FLOAT | PPC_FLOAT_FSEL | PPC_FLOAT_FRES |   \
                               PPC_FLOAT_FSQRT | PPC_FLOAT_FRSQRTE |           \
                               PPC_FLOAT_STFIWX |                              \
-                              PPC_CACHE | PPC_CACHE_ICBI | PPC_CACHE_DCBZT |  \
+                              PPC_CACHE | PPC_CACHE_ICBI | PPC_CACHE_DCBZ |  \
                               PPC_MEM_SYNC | PPC_MEM_EIEIO |                  \
                               PPC_MEM_TLBIE | PPC_MEM_TLBSYNC |               \
                               PPC_64B | PPC_ALTIVEC |                         \
@@ -6496,7 +6496,7 @@ static void init_proc_970FX (CPUPPCState *env)
                               PPC_FLOAT | PPC_FLOAT_FSEL | PPC_FLOAT_FRES |   \
                               PPC_FLOAT_FSQRT | PPC_FLOAT_FRSQRTE |           \
                               PPC_FLOAT_STFIWX |                              \
-                              PPC_CACHE | PPC_CACHE_ICBI | PPC_CACHE_DCBZT |  \
+                              PPC_CACHE | PPC_CACHE_ICBI | PPC_CACHE_DCBZ |  \
                               PPC_MEM_SYNC | PPC_MEM_EIEIO |                  \
                               PPC_MEM_TLBIE | PPC_MEM_TLBSYNC |               \
                               PPC_64B | PPC_ALTIVEC |                         \
@@ -6586,7 +6586,7 @@ static void init_proc_970GX (CPUPPCState *env)
                               PPC_FLOAT | PPC_FLOAT_FSEL | PPC_FLOAT_FRES |   \
                               PPC_FLOAT_FSQRT | PPC_FLOAT_FRSQRTE |           \
                               PPC_FLOAT_STFIWX |                              \
-                              PPC_CACHE | PPC_CACHE_ICBI | PPC_CACHE_DCBZT |  \
+                              PPC_CACHE | PPC_CACHE_ICBI | PPC_CACHE_DCBZ |  \
                               PPC_MEM_SYNC | PPC_MEM_EIEIO |                  \
                               PPC_MEM_TLBIE | PPC_MEM_TLBSYNC |               \
                               PPC_64B | PPC_ALTIVEC |                         \
@@ -6677,7 +6677,7 @@ static void init_proc_970MP (CPUPPCState *env)
                               PPC_FLOAT | PPC_FLOAT_FSEL | PPC_FLOAT_FRES |   \
                               PPC_FLOAT_FSQRT | PPC_FLOAT_FRSQRTE |           \
                               PPC_FLOAT_STFIWX |                              \
-                              PPC_CACHE | PPC_CACHE_ICBI | PPC_CACHE_DCBZT |  \
+                              PPC_CACHE | PPC_CACHE_ICBI | PPC_CACHE_DCBZ |  \
                               PPC_MEM_SYNC | PPC_MEM_EIEIO |                  \
                               PPC_MEM_TLBIE | PPC_MEM_TLBSYNC |               \
                               PPC_64B | PPC_ALTIVEC |                         \
