[PATCH 4/7] target/ppc: Add SPR TBU40

["Cédric Le Goater" <clg@kaod.org>]

From: Suraj Jitindar Singh <sjitindarsingh@gmail.com>

The spr TBU40 is used to set the upper 40 bits of the timebase
register, present on POWER5+ and later processors.

This register can only be written by the hypervisor, and cannot be read.

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 target/ppc/cpu.h                |  1 +
 target/ppc/helper.h             |  1 +
 hw/ppc/ppc.c                    | 13 +++++++++++++
 target/ppc/timebase_helper.c    |  5 +++++
 target/ppc/translate_init.inc.c | 19 +++++++++++++++++++
 5 files changed, 39 insertions(+)

diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
index 646a94370dba..8ffcfa0ea162 100644
--- a/target/ppc/cpu.h
+++ b/target/ppc/cpu.h
@@ -1312,6 +1312,7 @@ target_ulong cpu_ppc_load_decr(CPUPPCState *env);
 void cpu_ppc_store_decr(CPUPPCState *env, target_ulong value);
 target_ulong cpu_ppc_load_hdecr(CPUPPCState *env);
 void cpu_ppc_store_hdecr(CPUPPCState *env, target_ulong value);
+void cpu_ppc_store_tbu40(CPUPPCState *env, uint64_t value);
 uint64_t cpu_ppc_load_purr(CPUPPCState *env);
 void cpu_ppc_store_purr(CPUPPCState *env, uint64_t value);
 uint32_t cpu_ppc601_load_rtcl(CPUPPCState *env);
diff --git a/target/ppc/helper.h b/target/ppc/helper.h
index 356a14d8a639..cd0dfe383a2a 100644
--- a/target/ppc/helper.h
+++ b/target/ppc/helper.h
@@ -672,6 +672,7 @@ DEF_HELPER_FLAGS_2(store_decr, TCG_CALL_NO_RWG, void, env, tl)
 DEF_HELPER_FLAGS_1(load_hdecr, TCG_CALL_NO_RWG, tl, env)
 DEF_HELPER_FLAGS_2(store_hdecr, TCG_CALL_NO_RWG, void, env, tl)
 DEF_HELPER_FLAGS_2(store_vtb, TCG_CALL_NO_RWG, void, env, tl)
+DEF_HELPER_FLAGS_2(store_tbu40, TCG_CALL_NO_RWG, void, env, tl)
 DEF_HELPER_2(store_hid0_601, void, env, tl)
 DEF_HELPER_3(store_403_pbr, void, env, i32, tl)
 DEF_HELPER_FLAGS_1(load_40x_pit, TCG_CALL_NO_RWG, tl, env)
diff --git a/hw/ppc/ppc.c b/hw/ppc/ppc.c
index 353f11b91d40..3666e58865b3 100644
--- a/hw/ppc/ppc.c
+++ b/hw/ppc/ppc.c
@@ -710,6 +710,19 @@ void cpu_ppc_store_vtb(CPUPPCState *env, uint64_t value)
                      &tb_env->vtb_offset, value);
 }
 
+void cpu_ppc_store_tbu40(CPUPPCState *env, uint64_t value)
+{
+    ppc_tb_t *tb_env = env->tb_env;
+    uint64_t tb;
+
+    tb = cpu_ppc_get_tb(tb_env, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL),
+                        tb_env->tb_offset);
+    tb &= 0xFFFFFFUL;
+    tb |= (value & ~0xFFFFFFUL);
+    cpu_ppc_store_tb(tb_env, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL),
+                     &tb_env->tb_offset, tb);
+}
+
 static void cpu_ppc_tb_stop (CPUPPCState *env)
 {
     ppc_tb_t *tb_env = env->tb_env;
diff --git a/target/ppc/timebase_helper.c b/target/ppc/timebase_helper.c
index 2395295b778c..703bd9ed18b9 100644
--- a/target/ppc/timebase_helper.c
+++ b/target/ppc/timebase_helper.c
@@ -128,6 +128,11 @@ void helper_store_vtb(CPUPPCState *env, target_ulong val)
     cpu_ppc_store_vtb(env, val);
 }
 
+void helper_store_tbu40(CPUPPCState *env, target_ulong val)
+{
+    cpu_ppc_store_tbu40(env, val);
+}
+
 target_ulong helper_load_40x_pit(CPUPPCState *env)
 {
     return load_40x_pit(env);
diff --git a/target/ppc/translate_init.inc.c b/target/ppc/translate_init.inc.c
index a3cf1d8a450c..9815df6f77c8 100644
--- a/target/ppc/translate_init.inc.c
+++ b/target/ppc/translate_init.inc.c
@@ -327,6 +327,11 @@ static void spr_write_vtb(DisasContext *ctx, int sprn, int gprn)
     gen_helper_store_vtb(cpu_env, cpu_gpr[gprn]);
 }
 
+static void spr_write_tbu40(DisasContext *ctx, int sprn, int gprn)
+{
+    gen_helper_store_tbu40(cpu_env, cpu_gpr[gprn]);
+}
+
 #endif
 #endif
 
@@ -7848,6 +7853,16 @@ static void gen_spr_power5p_ear(CPUPPCState *env)
                  0x00000000);
 }
 
+static void gen_spr_power5p_tb(CPUPPCState *env)
+{
+    /* TBU40 (High 40 bits of the Timebase register */
+    spr_register_hv(env, SPR_TBU40, "TBU40",
+                    SPR_NOACCESS, SPR_NOACCESS,
+                    SPR_NOACCESS, SPR_NOACCESS,
+                    SPR_NOACCESS, &spr_write_tbu40,
+                    0x00000000);
+}
+
 #if !defined(CONFIG_USER_ONLY)
 static void spr_write_hmer(DisasContext *ctx, int sprn, int gprn)
 {
@@ -8399,6 +8414,7 @@ static void init_proc_power5plus(CPUPPCState *env)
     gen_spr_power5p_common(env);
     gen_spr_power5p_lpar(env);
     gen_spr_power5p_ear(env);
+    gen_spr_power5p_tb(env);
 
     /* env variables */
     env->dcache_line_size = 128;
@@ -8511,6 +8527,7 @@ static void init_proc_POWER7(CPUPPCState *env)
     gen_spr_power5p_common(env);
     gen_spr_power5p_lpar(env);
     gen_spr_power5p_ear(env);
+    gen_spr_power5p_tb(env);
     gen_spr_power6_common(env);
     gen_spr_power6_dbg(env);
     gen_spr_power7_book4(env);
@@ -8652,6 +8669,7 @@ static void init_proc_POWER8(CPUPPCState *env)
     gen_spr_power5p_common(env);
     gen_spr_power5p_lpar(env);
     gen_spr_power5p_ear(env);
+    gen_spr_power5p_tb(env);
     gen_spr_power6_common(env);
     gen_spr_power6_dbg(env);
     gen_spr_power8_tce_address_control(env);
@@ -8842,6 +8860,7 @@ static void init_proc_POWER9(CPUPPCState *env)
     gen_spr_power5p_common(env);
     gen_spr_power5p_lpar(env);
     gen_spr_power5p_ear(env);
+    gen_spr_power5p_tb(env);
     gen_spr_power6_common(env);
     gen_spr_power6_dbg(env);
     gen_spr_power8_tce_address_control(env);
-- 
2.21.0