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(haven.au.ibm.com [9.192.254.114]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id 785E6603B7; Fri, 9 Dec 2022 17:13:38 +1100 (AEDT) From: Nicholas Miehlbradt To: qemu-devel@nongnu.org Cc: qemu-ppc@nongnu.org, danielhb413@gmail.com, clg@kaod.org, david@gibson.dropbear.id.au, groug@kaod.org, victor.colombo@eldorado.org.br, mikey@neuling.org, Nicholas Miehlbradt Subject: [PATCH v2 1/2] target/ppc: Implement the DEXCR and HDEXCR Date: Fri, 9 Dec 2022 06:13:07 +0000 Message-Id: <20221209061308.1735802-2-nicholas@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221209061308.1735802-1-nicholas@linux.ibm.com> References: <20221209061308.1735802-1-nicholas@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: GZIHZaKVxmKyZzCUC8yCp9kkiiamN3ge X-Proofpoint-GUID: yqHUm14IkYbledxzm-JyCvyGrfhSKL-X X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-12-09_02,2022-12-08_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 mlxlogscore=999 spamscore=0 phishscore=0 bulkscore=0 clxscore=1015 impostorscore=0 adultscore=0 mlxscore=0 lowpriorityscore=0 suspectscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2212090052 Received-SPF: pass client-ip=148.163.158.5; envelope-from=nicholas@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Define the DEXCR and HDEXCR as special purpose registers. Each register occupies two SPR indicies, one which can be read in an unprivileged state and one which can be modified in the appropriate priviliged state, however both indicies refer to the same underlying value. Note that the ISA uses the abbreviation UDEXCR in two different contexts: the userspace DEXCR, the SPR index which can be read from userspace (implemented in this patch), and the ultravisor DEXCR, the equivalent register for the ultravisor state (not implemented). Signed-off-by: Nicholas Miehlbradt --- v2: Clearing of upper 32 bits of DEXCR is now performed on read from problem state rather than on write in privileged state. --- target/ppc/cpu.h | 19 +++++++++++++++++++ target/ppc/cpu_init.c | 25 +++++++++++++++++++++++++ target/ppc/spr_common.h | 1 + target/ppc/translate.c | 19 +++++++++++++++++++ 4 files changed, 64 insertions(+) diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h index 81d4263a07..0ed9f2ae35 100644 --- a/target/ppc/cpu.h +++ b/target/ppc/cpu.h @@ -1068,6 +1068,21 @@ struct ppc_radix_page_info { uint32_t entries[PPC_PAGE_SIZES_MAX_SZ]; }; +/*****************************************************************************/ +/* Dynamic Execution Control Register */ + +#define DEXCR_ASPECT(name, num) \ +FIELD(DEXCR, PNH_##name, PPC_BIT_NR(num), 1) \ +FIELD(DEXCR, PRO_##name, PPC_BIT_NR(num + 32), 1) \ +FIELD(HDEXCR, HNU_##name, PPC_BIT_NR(num), 1) \ +FIELD(HDEXCR, ENF_##name, PPC_BIT_NR(num + 32), 1) \ + +DEXCR_ASPECT(SBHE, 0) +DEXCR_ASPECT(IDRTPB, 1) +DEXCR_ASPECT(SRAPD, 4) +DEXCR_ASPECT(NPHIE, 5) +DEXCR_ASPECT(PHIE, 6) + /*****************************************************************************/ /* The whole PowerPC CPU context */ @@ -1674,9 +1689,11 @@ void ppc_compat_add_property(Object *obj, const char *name, #define SPR_BOOKE_GIVOR13 (0x1BC) #define SPR_BOOKE_GIVOR14 (0x1BD) #define SPR_TIR (0x1BE) +#define SPR_UHDEXCR (0x1C7) #define SPR_PTCR (0x1D0) #define SPR_HASHKEYR (0x1D4) #define SPR_HASHPKEYR (0x1D5) +#define SPR_HDEXCR (0x1D7) #define SPR_BOOKE_SPEFSCR (0x200) #define SPR_Exxx_BBEAR (0x201) #define SPR_Exxx_BBTAR (0x202) @@ -1865,8 +1882,10 @@ void ppc_compat_add_property(Object *obj, const char *name, #define SPR_RCPU_L2U_RA2 (0x32A) #define SPR_MPC_MD_DBRAM1 (0x32A) #define SPR_RCPU_L2U_RA3 (0x32B) +#define SPR_UDEXCR (0x32C) #define SPR_TAR (0x32F) #define SPR_ASDR (0x330) +#define SPR_DEXCR (0x33C) #define SPR_IC (0x350) #define SPR_VTB (0x351) #define SPR_MMCRC (0x353) diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c index cbf0081374..6433f4fdfd 100644 --- a/target/ppc/cpu_init.c +++ b/target/ppc/cpu_init.c @@ -5727,6 +5727,30 @@ static void register_power10_hash_sprs(CPUPPCState *env) hashpkeyr_initial_value); } +static void register_power10_dexcr_sprs(CPUPPCState *env) +{ + spr_register(env, SPR_DEXCR, "DEXCR", + SPR_NOACCESS, SPR_NOACCESS, + &spr_read_generic, &spr_write_generic, + 0); + + spr_register(env, SPR_UDEXCR, "DEXCR", + &spr_read_dexcr_ureg, SPR_NOACCESS, + &spr_read_dexcr_ureg, SPR_NOACCESS, + 0); + + spr_register_hv(env, SPR_HDEXCR, "HDEXCR", + SPR_NOACCESS, SPR_NOACCESS, + SPR_NOACCESS, SPR_NOACCESS, + &spr_read_generic, &spr_write_generic, + 0); + + spr_register(env, SPR_UHDEXCR, "HDEXCR", + &spr_read_dexcr_ureg, SPR_NOACCESS, + &spr_read_dexcr_ureg, SPR_NOACCESS, + 0); +} + /* * Initialize PMU counter overflow timers for Power8 and * newer Power chips when using TCG. @@ -6402,6 +6426,7 @@ static void init_proc_POWER10(CPUPPCState *env) register_power8_rpr_sprs(env); register_power9_mmu_sprs(env); register_power10_hash_sprs(env); + register_power10_dexcr_sprs(env); /* FIXME: Filter fields properly based on privilege level */ spr_register_kvm_hv(env, SPR_PSSCR, "PSSCR", NULL, NULL, NULL, NULL, diff --git a/target/ppc/spr_common.h b/target/ppc/spr_common.h index b5a5bc6895..91a74cec0f 100644 --- a/target/ppc/spr_common.h +++ b/target/ppc/spr_common.h @@ -195,6 +195,7 @@ void spr_read_ebb_upper32(DisasContext *ctx, int gprn, int sprn); void spr_write_ebb_upper32(DisasContext *ctx, int sprn, int gprn); void spr_write_hmer(DisasContext *ctx, int sprn, int gprn); void spr_write_lpcr(DisasContext *ctx, int sprn, int gprn); +void spr_read_dexcr_ureg(DisasContext *ctx, int sprn, int gprn); #endif void register_low_BATs(CPUPPCState *env); diff --git a/target/ppc/translate.c b/target/ppc/translate.c index 19c1d17cb0..fcb1180712 100644 --- a/target/ppc/translate.c +++ b/target/ppc/translate.c @@ -1249,6 +1249,25 @@ void spr_write_ebb_upper32(DisasContext *ctx, int sprn, int gprn) gen_fscr_facility_check(ctx, SPR_FSCR, FSCR_EBB, sprn, FSCR_IC_EBB); spr_write_prev_upper32(ctx, sprn, gprn); } + +void spr_read_dexcr_ureg(DisasContext *ctx, int gprn, int sprn) +{ + TCGv t0 = tcg_temp_new(); + + /* + * Access to the (H)DEXCR in problem state is done using seperate + * SPR indexes which are 16 below the SPR indexes which have full + * access to the (H)DEXCR in privileged state. Problem state may + * only read bits 32:63, bits 0:31 return 0. + * + * See section 9.3.1-9.3.2 of PowerISA v3.1B + */ + + gen_load_spr(t0, sprn + 16); + tcg_gen_ext32u_tl(cpu_gpr[gprn], t0); + + tcg_temp_free(t0); +} #endif #define GEN_HANDLER(name, opc1, opc2, opc3, inval, type) \ -- 2.34.1