This allows a guest to change its TOD. We already take care of updating
all CKC timers from within S390TODClass.
Use MO_ALIGN to load the operand manually - this will properly trigger a
SPECIFICATION exception.
Signed-off-by: David Hildenbrand <da...@redhat.com>
---
target/s390x/helper.h | 1 +
target/s390x/insn-data.def | 3 +--
target/s390x/misc_helper.c | 19 +++++++++++++++++++
target/s390x/translate.c | 9 +++++++++
4 files changed, 30 insertions(+), 2 deletions(-)
diff --git a/target/s390x/helper.h b/target/s390x/helper.h
index 59cba86a27..97c60ca7bc 100644
--- a/target/s390x/helper.h
+++ b/target/s390x/helper.h
@@ -127,6 +127,7 @@ DEF_HELPER_4(diag, void, env, i32, i32, i32)
DEF_HELPER_3(load_psw, noreturn, env, i64, i64)
DEF_HELPER_FLAGS_2(spx, TCG_CALL_NO_RWG, void, env, i64)
DEF_HELPER_FLAGS_1(stck, TCG_CALL_NO_RWG_SE, i64, env)
+DEF_HELPER_FLAGS_2(sck, TCG_CALL_NO_RWG, i32, env, i64)
DEF_HELPER_FLAGS_2(sckc, TCG_CALL_NO_RWG, void, env, i64)
DEF_HELPER_FLAGS_2(sckpf, TCG_CALL_NO_RWG, void, env, i64)
DEF_HELPER_FLAGS_1(stckc, TCG_CALL_NO_RWG, i64, env)
diff --git a/target/s390x/insn-data.def b/target/s390x/insn-data.def
index 157619403d..5c6f33ed9c 100644
--- a/target/s390x/insn-data.def
+++ b/target/s390x/insn-data.def
@@ -997,8 +997,7 @@
/* SET ADDRESS SPACE CONTROL FAST */
C(0xb279, SACF, S, Z, 0, a2, 0, 0, sacf, 0)
/* SET CLOCK */
- /* ??? Not implemented - is it necessary? */
- C(0xb204, SCK, S, Z, 0, 0, 0, 0, 0, 0)
+ C(0xb204, SCK, S, Z, la2, 0, 0, 0, sck, 0)
/* SET CLOCK COMPARATOR */
C(0xb206, SCKC, S, Z, 0, m2_64a, 0, 0, sckc, 0)
/* SET CLOCK PROGRAMMABLE FIELD */
diff --git a/target/s390x/misc_helper.c b/target/s390x/misc_helper.c
index d5f9f5e1d3..c9712b9476 100644
--- a/target/s390x/misc_helper.c
+++ b/target/s390x/misc_helper.c
@@ -191,6 +191,25 @@ void tcg_s390_tod_updated(CPUState *cs, run_on_cpu_data
opaque)
helper_sckc(env, env->ckc);
}
+/* Set Clock */
+uint32_t HELPER(sck)(CPUS390XState *env, uint64_t tod_low)
+{
+ S390TODState *td = s390_get_tod();
+ S390TODClass *tdc = S390_TOD_GET_CLASS(td);
+ S390TOD tod = {
+ .high = 0,
+ .low = tod_low,
+ };
+ Error *err = NULL;
+
+ qemu_mutex_lock_iothread();
+ tdc->set(td, &tod, &err);
+ qemu_mutex_unlock_iothread();
+ g_assert(!err);
+
+ return 0;
+}
+
/* Set Tod Programmable Field */
void HELPER(sckpf)(CPUS390XState *env, uint64_t r0)
{
diff --git a/target/s390x/translate.c b/target/s390x/translate.c
index fdfec7feba..57c03cbf58 100644
--- a/target/s390x/translate.c
+++ b/target/s390x/translate.c
@@ -4016,6 +4016,15 @@ static DisasJumpType op_stcke(DisasContext *s, DisasOps
*o)
return DISAS_NEXT;
}
+static DisasJumpType op_sck(DisasContext *s, DisasOps *o)
+{
+ check_privileged(s);
+ tcg_gen_qemu_ld_i64(o->in1, o->addr1, get_mem_index(s), MO_TEQ | MO_ALIGN);
+ gen_helper_sck(cc_op, cpu_env, o->in1);
+ set_cc_static(s);
+ return DISAS_NEXT;
+}
+
static DisasJumpType op_sckc(DisasContext *s, DisasOps *o)
{
check_privileged(s);
--
2.17.1
