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[114.34.229.221]) by smtp.gmail.com with ESMTPSA id f18sm6567309pgv.84.2020.08.06.03.47.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 Aug 2020 03:47:39 -0700 (PDT) From: frank.chang@sifive.com To: qemu-devel@nongnu.org, qemu-riscv@nongnu.org Subject: [RFC v3 08/71] target/riscv: rvv-1.0: add vcsr register Date: Thu, 6 Aug 2020 18:46:05 +0800 Message-Id: <20200806104709.13235-9-frank.chang@sifive.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200806104709.13235-1-frank.chang@sifive.com> References: <20200806104709.13235-1-frank.chang@sifive.com> Received-SPF: pass client-ip=2607:f8b0:4864:20::629; envelope-from=frank.chang@sifive.com; helo=mail-pl1-x629.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. 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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sagar Karandikar , Frank Chang , Bastian Koppelmann , Alistair Francis , Palmer Dabbelt , LIU Zhiwei Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: LIU Zhiwei Signed-off-by: LIU Zhiwei Signed-off-by: Frank Chang Reviewed-by: Richard Henderson --- target/riscv/cpu_bits.h | 7 +++++++ target/riscv/csr.c | 21 +++++++++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h index 5b0be0bb888..7afdd4814bb 100644 --- a/target/riscv/cpu_bits.h +++ b/target/riscv/cpu_bits.h @@ -60,9 +60,16 @@ #define CSR_VSTART 0x008 #define CSR_VXSAT 0x009 #define CSR_VXRM 0x00a +#define CSR_VCSR 0x00f #define CSR_VL 0xc20 #define CSR_VTYPE 0xc21 +/* VCSR fields */ +#define VCSR_VXSAT_SHIFT 0 +#define VCSR_VXSAT (0x1 << VCSR_VXSAT_SHIFT) +#define VCSR_VXRM_SHIFT 1 +#define VCSR_VXRM (0x3 << VCSR_VXRM_SHIFT) + /* User Timers and Counters */ #define CSR_CYCLE 0xc00 #define CSR_TIME 0xc01 diff --git a/target/riscv/csr.c b/target/riscv/csr.c index 34c951d5d4b..ca85a54a0f1 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -251,6 +251,26 @@ static int write_vstart(CPURISCVState *env, int csrno, target_ulong val) return 0; } +static int read_vcsr(CPURISCVState *env, int csrno, target_ulong *val) +{ + *val = (env->vxrm << VCSR_VXRM_SHIFT) | (env->vxsat << VCSR_VXSAT_SHIFT); + return 0; +} + +static int write_vcsr(CPURISCVState *env, int csrno, target_ulong val) +{ +#if !defined(CONFIG_USER_ONLY) + if (!env->debugger && !riscv_cpu_vector_enabled(env)) { + return -1; + } + env->mstatus |= MSTATUS_VS; +#endif + + env->vxrm = (val & VCSR_VXRM) >> VCSR_VXRM_SHIFT; + env->vxsat = (val & VCSR_VXSAT) >> VCSR_VXSAT_SHIFT; + return 0; +} + /* User Timers and Counters */ static int read_instret(CPURISCVState *env, int csrno, target_ulong *val) { @@ -1269,6 +1289,7 @@ static riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = { [CSR_VSTART] = { vs, read_vstart, write_vstart }, [CSR_VXSAT] = { vs, read_vxsat, write_vxsat }, [CSR_VXRM] = { vs, read_vxrm, write_vxrm }, + [CSR_VCSR] = { vs, read_vcsr, write_vcsr }, [CSR_VL] = { vs, read_vl }, [CSR_VTYPE] = { vs, read_vtype }, /* User Timers and Counters */