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[PATCH v6 08/72] target/riscv: rvv-1.0: add vcsr register
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From: |
frank . chang |
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Subject: |
[PATCH v6 08/72] target/riscv: rvv-1.0: add vcsr register |
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Date: |
Tue, 12 Jan 2021 17:38:42 +0800 |
From: LIU Zhiwei <zhiwei_liu@c-sky.com>
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>
---
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 8edf81692e6..2538580a62a 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 6eda5bacb7c..4ac1ed8cfa8 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -335,6 +335,26 @@ 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)
{
@@ -1397,6 +1417,7 @@ 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 */
--
2.17.1
- [PATCH v6 02/72] target/riscv: Use FIELD_EX32() to extract wd field, (continued)
- [PATCH v6 02/72] target/riscv: Use FIELD_EX32() to extract wd field, frank . chang, 2021/01/12
- [PATCH v6 03/72] target/riscv: rvv-1.0: add mstatus VS field, frank . chang, 2021/01/12
- [PATCH v6 04/72] target/riscv: rvv-1.0: add sstatus VS field, frank . chang, 2021/01/12
- [PATCH v6 06/72] target/riscv: rvv-1.0: add translation-time vector context status, frank . chang, 2021/01/12
- [PATCH v6 05/72] target/riscv: rvv-1.0: introduce writable misa.v field, frank . chang, 2021/01/12
- [PATCH v6 08/72] target/riscv: rvv-1.0: add vcsr register,
frank . chang <=
- [PATCH v6 07/72] target/riscv: rvv-1.0: remove rvv related codes from fcsr registers, frank . chang, 2021/01/12
- [PATCH v6 09/72] target/riscv: rvv-1.0: add vlenb register, frank . chang, 2021/01/12
- [PATCH v6 10/72] target/riscv: rvv-1.0: check MSTATUS_VS when accessing vector csr registers, frank . chang, 2021/01/12
- [PATCH v6 11/72] target/riscv: rvv-1.0: remove MLEN calculations, frank . chang, 2021/01/12
- [PATCH v6 12/72] target/riscv: rvv-1.0: add fractional LMUL, frank . chang, 2021/01/12