[RFC PATCH v8 07/21] riscv: Reset vector register

[Greentime Hu <greentime.hu@sifive.com>]

From: Guo Ren <guoren@linux.alibaba.com>

Reset vector registers at boot-time and disable vector instructions
execution for kernel mode.

[greentime.hu@sifive.com: add comments]
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Co-developed-by: Vincent Chen <vincent.chen@sifive.com>
Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
Co-developed-by: Greentime Hu <greentime.hu@sifive.com>
Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
---
 arch/riscv/kernel/entry.S |  6 ++---
 arch/riscv/kernel/head.S  | 49 +++++++++++++++++++++++++++++++++++++--
 2 files changed, 50 insertions(+), 5 deletions(-)

diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
index 98f502654edd..ad0fa80ada81 100644
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@@ -77,10 +77,10 @@ _save_context:
 	 * Disable user-mode memory access as it should only be set in the
 	 * actual user copy routines.
 	 *
-	 * Disable the FPU to detect illegal usage of floating point in kernel
-	 * space.
+	 * Disable the FPU/Vector to detect illegal usage of floating point
+	 * or vector in kernel space.
 	 */
-	li t0, SR_SUM | SR_FS
+	li t0, SR_SUM | SR_FS | SR_VS
 
 	REG_L s0, TASK_TI_USER_SP(tp)
 	csrrc s1, CSR_STATUS, t0
diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
index fce5184b22c3..cf331f138142 100644
--- a/arch/riscv/kernel/head.S
+++ b/arch/riscv/kernel/head.S
@@ -241,10 +241,10 @@ pmp_done:
 .option pop
 
 	/*
-	 * Disable FPU to detect illegal usage of
+	 * Disable FPU & VECTOR to detect illegal usage of
 	 * floating point in kernel space
 	 */
-	li t0, SR_FS
+	li t0, SR_FS | SR_VS
 	csrc CSR_STATUS, t0
 
 #ifdef CONFIG_SMP
@@ -432,6 +432,51 @@ ENTRY(reset_regs)
 	csrw	fcsr, 0
 	/* note that the caller must clear SR_FS */
 #endif /* CONFIG_FPU */
+
+#ifdef CONFIG_VECTOR
+	csrr	t0, CSR_MISA
+	li	t1, (COMPAT_HWCAP_ISA_V >> 16)
+	slli	t1, t1, 16
+	and	t0, t0, t1
+	beqz	t0, .Lreset_regs_done
+
+	li	t1, SR_VS
+	csrs	CSR_STATUS, t1
+	vmv.v.i v0, 0
+	vmv.v.i v1, 0
+	vmv.v.i v2, 0
+	vmv.v.i v3, 0
+	vmv.v.i v4, 0
+	vmv.v.i v5, 0
+	vmv.v.i v6, 0
+	vmv.v.i v7, 0
+	vmv.v.i v8, 0
+	vmv.v.i v9, 0
+	vmv.v.i v10, 0
+	vmv.v.i v11, 0
+	vmv.v.i v12, 0
+	vmv.v.i v13, 0
+	vmv.v.i v14, 0
+	vmv.v.i v15, 0
+	vmv.v.i v16, 0
+	vmv.v.i v17, 0
+	vmv.v.i v18, 0
+	vmv.v.i v19, 0
+	vmv.v.i v20, 0
+	vmv.v.i v21, 0
+	vmv.v.i v22, 0
+	vmv.v.i v23, 0
+	vmv.v.i v24, 0
+	vmv.v.i v25, 0
+	vmv.v.i v26, 0
+	vmv.v.i v27, 0
+	vmv.v.i v28, 0
+	vmv.v.i v29, 0
+	vmv.v.i v30, 0
+	vmv.v.i v31, 0
+	/* note that the caller must clear SR_VS */
+#endif /* CONFIG_VECTOR */
+
 .Lreset_regs_done:
 	ret
 END(reset_regs)
-- 
2.31.1