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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::62a; envelope-from=npiggin@gmail.com; helo=mail-pl1-x62a.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1685496283774100006 Content-Type: text/plain; charset="utf-8" A relatively simple case to begin with, CTRL is a SMT shared register where reads and writes need to synchronise against state changes by other threads in the core. Atomic serialisation operations are used to achieve this. Signed-off-by: Nicholas Piggin --- target/ppc/helper.h | 2 ++ target/ppc/misc_helper.c | 33 +++++++++++++++++++++++++++++++++ target/ppc/translate.c | 18 +++++++++++++++++- 3 files changed, 52 insertions(+), 1 deletion(-) diff --git a/target/ppc/helper.h b/target/ppc/helper.h index 38efbc351c..fda40b8a60 100644 --- a/target/ppc/helper.h +++ b/target/ppc/helper.h @@ -704,6 +704,8 @@ DEF_HELPER_3(store_dcr, void, env, tl, tl) =20 DEF_HELPER_2(load_dump_spr, void, env, i32) DEF_HELPER_2(store_dump_spr, void, env, i32) +DEF_HELPER_3(spr_write_CTRL, void, env, i32, tl) + DEF_HELPER_4(fscr_facility_check, void, env, i32, i32, i32) DEF_HELPER_4(msr_facility_check, void, env, i32, i32, i32) DEF_HELPER_FLAGS_1(load_tbl, TCG_CALL_NO_RWG, tl, env) diff --git a/target/ppc/misc_helper.c b/target/ppc/misc_helper.c index 40ddc5c08c..ffe54a4310 100644 --- a/target/ppc/misc_helper.c +++ b/target/ppc/misc_helper.c @@ -43,6 +43,39 @@ void helper_store_dump_spr(CPUPPCState *env, uint32_t sp= rn) env->spr[sprn]); } =20 +void helper_spr_write_CTRL(CPUPPCState *env, uint32_t sprn, + target_ulong val) +{ + CPUState *cs =3D env_cpu(env); + CPUState *ccs; + uint32_t nr_threads =3D cs->nr_threads; + uint32_t core_id =3D env->spr[SPR_PIR] & ~(nr_threads - 1); + uint32_t run =3D val & 1; + uint32_t ts, ts_mask; + + assert(sprn =3D=3D SPR_CTRL); + assert(core_id =3D=3D env->spr[SPR_PIR] - env->spr[SPR_TIR]); + + env->spr[sprn] &=3D ~1U; + env->spr[sprn] |=3D run; + + ts_mask =3D ~(1U << (8 + env->spr[SPR_TIR])); + ts =3D run << (8 + env->spr[SPR_TIR]); + + CPU_FOREACH(ccs) { + CPUPPCState *cenv =3D &POWERPC_CPU(ccs)->env; + uint32_t ccore_id =3D cenv->spr[SPR_PIR] & ~(nr_threads - 1); + + assert(ccore_id =3D=3D cenv->spr[SPR_PIR] - cenv->spr[SPR_TIR]); + + if (ccore_id =3D=3D core_id) { + cenv->spr[sprn] &=3D ts_mask; + cenv->spr[sprn] |=3D ts; + } + } +} + + #ifdef TARGET_PPC64 static void raise_hv_fu_exception(CPUPPCState *env, uint32_t bit, const char *caller, uint32_t cause, diff --git a/target/ppc/translate.c b/target/ppc/translate.c index 72270c2163..31821f92f5 100644 --- a/target/ppc/translate.c +++ b/target/ppc/translate.c @@ -443,7 +443,7 @@ void spr_write_generic32(DisasContext *ctx, int sprn, i= nt gprn) #endif } =20 -void spr_write_CTRL(DisasContext *ctx, int sprn, int gprn) +static void spr_write_CTRL_ST(DisasContext *ctx, int sprn, int gprn) { /* This does not implement >1 thread */ TCGv t0 =3D tcg_temp_new(); @@ -452,6 +452,22 @@ void spr_write_CTRL(DisasContext *ctx, int sprn, int g= prn) tcg_gen_shli_tl(t1, t0, 8); /* Duplicate the bit in TS */ tcg_gen_or_tl(t1, t1, t0); gen_store_spr(sprn, t1); +} + +void spr_write_CTRL(DisasContext *ctx, int sprn, int gprn) +{ + if (!(ctx->flags & POWERPC_FLAG_SMT)) { + spr_write_CTRL_ST(ctx, sprn, gprn); + goto out; + } + + if (!gen_serialize(ctx)) { + return; + } + + gen_helper_spr_write_CTRL(cpu_env, tcg_constant_i32(sprn), + cpu_gpr[gprn]); +out: spr_store_dump_spr(sprn); =20 /* --=20 2.40.1