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charset="utf-8" From: LIU Zhiwei Signed-off-by: LIU Zhiwei Signed-off-by: Frank Chang Reviewed-by: Richard Henderson Reviewed-by: Alistair Francis --- target/riscv/cpu_bits.h | 7 +++++++ target/riscv/csr.c | 17 +++++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h index bb62da7549d..8dc6aa62c64 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 =20 +/* 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 c522260986c..832ccdcf331 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -336,6 +336,22 @@ static RISCVException write_vstart(CPURISCVState *env,= int csrno, return RISCV_EXCP_NONE; } =20 +static int read_vcsr(CPURISCVState *env, int csrno, target_ulong *val) +{ + *val =3D (env->vxrm << VCSR_VXRM_SHIFT) | (env->vxsat << VCSR_VXSAT_SH= IFT); + return RISCV_EXCP_NONE; +} + +static int write_vcsr(CPURISCVState *env, int csrno, target_ulong val) +{ +#if !defined(CONFIG_USER_ONLY) + env->mstatus |=3D MSTATUS_VS; +#endif + env->vxrm =3D (val & VCSR_VXRM) >> VCSR_VXRM_SHIFT; + env->vxsat =3D (val & VCSR_VXSAT) >> VCSR_VXSAT_SHIFT; + return RISCV_EXCP_NONE; +} + /* User Timers and Counters */ static RISCVException read_instret(CPURISCVState *env, int csrno, target_ulong *val) @@ -1816,6 +1832,7 @@ riscv_csr_operations csr_ops[CSR_TABLE_SIZE] =3D { [CSR_VSTART] =3D { "vstart", vs, read_vstart, write_vstart }, [CSR_VXSAT] =3D { "vxsat", vs, read_vxsat, write_vxsat }, [CSR_VXRM] =3D { "vxrm", vs, read_vxrm, write_vxrm }, + [CSR_VCSR] =3D { "vcsr", vs, read_vcsr, write_vcsr }, [CSR_VL] =3D { "vl", vs, read_vl }, [CSR_VTYPE] =3D { "vtype", vs, read_vtype }, /* User Timers and Counters */ --=20 2.25.1