[Qemu-devel] [PATCH v5 24/30] target-ppc: Add POWER8's TM SPRs

[Alexey Kardashevskiy <aik@ozlabs.ru>]

This adds TM (Transactional Memory) SPRs.

This adds generic spr_read_prev_upper32()/spr_write_prev_upper32() to
handle upper half SPRs such as TEXASRU which is upper half of TEXASR.
Since this is not the only register like that and their numbers go
consequently, it makes sense to generalize the helpers.

This adds a gen_msr_facility_check() helper which purpose is to generate
the Facility Unavailable exception if the facility is disabled.
It is a copy of gen_fscr_facility_check() but it checks for enabled
facility in MSR rather than FSCR/HFSCR. It still sets the interrupt cause
in FSCR/HFSCR (whichever is passed to the helper).

This adds spr_read_tm/spr_write_tm/spr_read_tm_upper32/spr_write_tm_upper32
which are used for TM SPRs.

This adds TM-relates MSR bits definitions. This enables TM in POWER8 CPU class'
msr_mask.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
Changes:
v5:
* enabled TM in ppc_cpu_reset() for user-mode

v4:
* enable MSR_TM in msr_mask
* tested compile with --enable-tcg-debug and ppc-softmmu
* re-implemented spr_(read|write)_prev_upper32 using TCGv types (not i32 or i64)
---
 target-ppc/cpu.h            | 10 ++++++
 target-ppc/helper.h         |  1 +
 target-ppc/misc_helper.c    | 12 +++++++
 target-ppc/translate_init.c | 88 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 111 insertions(+)

diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h
index 8a27331..c48bfb5 100644
--- a/target-ppc/cpu.h
+++ b/target-ppc/cpu.h
@@ -427,6 +427,9 @@ struct ppc_slb_t {
 #define MSR_TAG  62 /* Tag-active mode (POWERx ?)                            */
 #define MSR_ISF  61 /* Sixty-four-bit interrupt mode on 630                  */
 #define MSR_SHV  60 /* hypervisor state                               hflags */
+#define MSR_TS0  34 /* Transactional state, 2 bits (Book3s)                  */
+#define MSR_TS1  33
+#define MSR_TM   32 /* Transactional Memory Available (Book3s)               */
 #define MSR_CM   31 /* Computation mode for BookE                     hflags */
 #define MSR_ICM  30 /* Interrupt computation mode for BookE                  */
 #define MSR_THV  29 /* hypervisor state for 32 bits PowerPC           hflags */
@@ -503,6 +506,9 @@ struct ppc_slb_t {
 #define msr_pmm  ((env->msr >> MSR_PMM)  & 1)
 #define msr_ri   ((env->msr >> MSR_RI)   & 1)
 #define msr_le   ((env->msr >> MSR_LE)   & 1)
+#define msr_ts   ((env->msr >> MSR_TS1)  & 3)
+#define msr_tm   ((env->msr >> MSR_TM)   & 1)
+
 /* Hypervisor bit is more specific */
 #if defined(TARGET_PPC64)
 #define MSR_HVB (1ULL << MSR_SHV)
@@ -1275,6 +1281,10 @@ static inline int cpu_mmu_index (CPUPPCState *env)
 #define SPR_MPC_EIE           (0x050)
 #define SPR_MPC_EID           (0x051)
 #define SPR_MPC_NRI           (0x052)
+#define SPR_TFHAR             (0x080)
+#define SPR_TFIAR             (0x081)
+#define SPR_TEXASR            (0x082)
+#define SPR_TEXASRU           (0x083)
 #define SPR_UCTRL             (0x088)
 #define SPR_MPC_CMPA          (0x090)
 #define SPR_MPC_CMPB          (0x091)
diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index c1417ea..509eae5 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -578,6 +578,7 @@ DEF_HELPER_3(store_dcr, void, env, tl, tl)
 DEF_HELPER_2(load_dump_spr, void, env, i32)
 DEF_HELPER_2(store_dump_spr, void, env, i32)
 DEF_HELPER_4(fscr_facility_check, void, env, i32, i32, i32)
+DEF_HELPER_4(msr_facility_check, void, env, i32, i32, i32)
 DEF_HELPER_1(load_tbl, tl, env)
 DEF_HELPER_1(load_tbu, tl, env)
 DEF_HELPER_1(load_atbl, tl, env)
diff --git a/target-ppc/misc_helper.c b/target-ppc/misc_helper.c
index 554831f..a577b3a 100644
--- a/target-ppc/misc_helper.c
+++ b/target-ppc/misc_helper.c
@@ -61,6 +61,18 @@ void helper_fscr_facility_check(CPUPPCState *env, uint32_t bit,
 #endif
 }
 
+void helper_msr_facility_check(CPUPPCState *env, uint32_t bit,
+                               uint32_t sprn, uint32_t cause)
+{
+#ifdef TARGET_PPC64
+    if (env->msr & (1ULL << bit)) {
+        /* Facility is enabled, continue */
+        return;
+    }
+    raise_fu_exception(env, bit, sprn, cause);
+#endif
+}
+
 #if !defined(CONFIG_USER_ONLY)
 
 void helper_store_sdr1(CPUPPCState *env, target_ulong val)
diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
index 548b582..d31ecc6 100644
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -7297,6 +7297,45 @@ static void gen_fscr_facility_check(void *opaque, int facility_sprn, int bit,
     tcg_temp_free_i32(t1);
 }
 
+static void gen_msr_facility_check(void *opaque, int facility_sprn, int bit,
+                                   int sprn, int cause)
+{
+    TCGv_i32 t1 = tcg_const_i32(bit);
+    TCGv_i32 t2 = tcg_const_i32(sprn);
+    TCGv_i32 t3 = tcg_const_i32(cause);
+
+    gen_update_current_nip(opaque);
+    gen_helper_msr_facility_check(cpu_env, t1, t2, t3);
+
+    tcg_temp_free_i32(t3);
+    tcg_temp_free_i32(t2);
+    tcg_temp_free_i32(t1);
+}
+
+static void spr_read_prev_upper32(void *opaque, int gprn, int sprn)
+{
+    TCGv spr_up = tcg_temp_new();
+    TCGv spr = tcg_temp_new();
+
+    gen_load_spr(spr, sprn - 1);
+    tcg_gen_shri_tl(spr_up, spr, 32);
+    tcg_gen_ext32u_tl(cpu_gpr[gprn], spr_up);
+
+    tcg_temp_free(spr);
+    tcg_temp_free(spr_up);
+}
+
+static void spr_write_prev_upper32(void *opaque, int sprn, int gprn)
+{
+    TCGv spr = tcg_temp_new();
+
+    gen_load_spr(spr, sprn - 1);
+    tcg_gen_deposit_tl(spr, spr, cpu_gpr[gprn], 32, 32);
+    gen_store_spr(sprn - 1, spr);
+
+    tcg_temp_free(spr);
+}
+
 static int check_pow_970 (CPUPPCState *env)
 {
     if (env->spr[SPR_HID0] & (HID0_DEEPNAP | HID0_DOZE | HID0_NAP)) {
@@ -7634,6 +7673,50 @@ static void gen_spr_power8_tce_address_control(CPUPPCState *env)
                  0x00000000);
 }
 
+static void spr_read_tm(void *opaque, int gprn, int sprn)
+{
+    gen_msr_facility_check(opaque, SPR_FSCR, MSR_TM, sprn, FSCR_IC_TM);
+    spr_read_generic(opaque, gprn, sprn);
+}
+
+static void spr_write_tm(void *opaque, int sprn, int gprn)
+{
+    gen_msr_facility_check(opaque, SPR_FSCR, MSR_TM, sprn, FSCR_IC_TM);
+    spr_write_generic(opaque, sprn, gprn);
+}
+
+static void spr_read_tm_upper32(void *opaque, int gprn, int sprn)
+{
+    gen_msr_facility_check(opaque, SPR_FSCR, MSR_TM, sprn, FSCR_IC_TM);
+    spr_read_prev_upper32(opaque, gprn, sprn);
+}
+
+static void spr_write_tm_upper32(void *opaque, int sprn, int gprn)
+{
+    gen_msr_facility_check(opaque, SPR_FSCR, MSR_TM, sprn, FSCR_IC_TM);
+    spr_write_prev_upper32(opaque, sprn, gprn);
+}
+
+static void gen_spr_power8_tm(CPUPPCState *env)
+{
+    spr_register_kvm(env, SPR_TFHAR, "TFHAR",
+                     &spr_read_tm, &spr_write_tm,
+                     &spr_read_tm, &spr_write_tm,
+                     KVM_REG_PPC_TFHAR, 0x00000000);
+    spr_register_kvm(env, SPR_TFIAR, "TFIAR",
+                     &spr_read_tm, &spr_write_tm,
+                     &spr_read_tm, &spr_write_tm,
+                     KVM_REG_PPC_TFIAR, 0x00000000);
+    spr_register_kvm(env, SPR_TEXASR, "TEXASR",
+                     &spr_read_tm, &spr_write_tm,
+                     &spr_read_tm, &spr_write_tm,
+                     KVM_REG_PPC_TEXASR, 0x00000000);
+    spr_register(env, SPR_TEXASRU, "TEXASRU",
+                 &spr_read_tm_upper32, &spr_write_tm_upper32,
+                 &spr_read_tm_upper32, &spr_write_tm_upper32,
+                 0x00000000);
+}
+
 static void gen_spr_power8_fscr(CPUPPCState *env)
 {
 #if defined(CONFIG_USER_ONLY)
@@ -7695,6 +7778,7 @@ static void init_proc_book3s_64(CPUPPCState *env, int version)
         gen_spr_power8_fscr(env);
         gen_spr_power8_pmu_sup(env);
         gen_spr_power8_pmu_user(env);
+        gen_spr_power8_tm(env);
     }
 #if !defined(CONFIG_USER_ONLY)
     switch (version) {
@@ -8066,6 +8150,7 @@ POWERPC_FAMILY(POWER8)(ObjectClass *oc, void *data)
                         PPC2_LSQ_ISA207 | PPC2_ALTIVEC_207 |
                         PPC2_ISA205 | PPC2_ISA207S;
     pcc->msr_mask = (1ull << MSR_SF) |
+                    (1ull << MSR_TM) |
                     (1ull << MSR_VR) |
                     (1ull << MSR_VSX) |
                     (1ull << MSR_EE) |
@@ -9378,6 +9463,9 @@ static void ppc_cpu_reset(CPUState *s)
     msr |= (target_ulong)1 << MSR_VSX; /* Allow VSX usage */
     msr |= (target_ulong)1 << MSR_SPE; /* Allow SPE usage */
     msr |= (target_ulong)1 << MSR_PR;
+#if defined(TARGET_PPC64)
+    msr |= (target_ulong)1 << MSR_TM; /* Transactional memory */
+#endif
 #if !defined(TARGET_WORDS_BIGENDIAN)
     msr |= (target_ulong)1 << MSR_LE; /* Little-endian user mode */
 #endif
-- 
2.0.0