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target/riscv: rvv-1.0: add vcsr register

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Signed-off-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
Signed-off-by: Frank Chang <frank.chang@sifive.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20211210075704.23951-10-frank.chang@sifive.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
LIU Zhiwei 2021-12-10 15:55:55 +08:00 committed by Alistair Francis
parent 9bd291f6e3
commit 4594fa5a96
2 changed files with 24 additions and 0 deletions
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7
target/riscv/cpu_bits.h
View file

@ -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

17
target/riscv/csr.c
View file

@ -336,6 +336,22 @@ static RISCVException write_vstart(CPURISCVState *env, int csrno,
return RISCV_EXCP_NONE;
}
static int read_vcsr(CPURISCVState *env, int csrno, target_ulong *val)
{
*val = (env->vxrm << VCSR_VXRM_SHIFT) | (env->vxsat << VCSR_VXSAT_SHIFT);
return RISCV_EXCP_NONE;
}
static int write_vcsr(CPURISCVState *env, int csrno, target_ulong val)
{
#if !defined(CONFIG_USER_ONLY)
env->mstatus |= MSTATUS_VS;
#endif
env->vxrm = (val & VCSR_VXRM) >> VCSR_VXRM_SHIFT;
env->vxsat = (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] = {
[CSR_VSTART] = { "vstart", vs, read_vstart, write_vstart },
[CSR_VXSAT] = { "vxsat", vs, read_vxsat, write_vxsat },
[CSR_VXRM] = { "vxrm", vs, read_vxrm, write_vxrm },
[CSR_VCSR] = { "vcsr", vs, read_vcsr, write_vcsr },
[CSR_VL] = { "vl", vs, read_vl },
[CSR_VTYPE] = { "vtype", vs, read_vtype },
/* User Timers and Counters */