[PATCH 17/19] riscv: hwprobe: Document vendor extensions and xtheadvector extension

Charlie Jenkins
2024-04-12T04:14:46Z

Document support for vendor extensions using the key
RISCV_HWPROBE_KEY_VENDOR_EXT_0 and xtheadvector extension using the key
RISCV_ISA_VENDOR_EXT_XTHEADVECTOR.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
---
Documentation/arch/riscv/hwprobe.rst | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/Documentation/arch/riscv/hwprobe.rst b/Documentation/arch/riscv/hwprobe.rst
index b2bcc9eed9aa..38e1b0c7c38c 100644
--- a/Documentation/arch/riscv/hwprobe.rst
+++ b/Documentation/arch/riscv/hwprobe.rst
@@ -210,3 +210,15 @@ The following keys are defined:

* :c:macro:`RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE`: An unsigned int which
represents the size of the Zicboz block in bytes.
+
+* :c:macro:`RISCV_HWPROBE_KEY_VENDOR_EXT_0`: A bitmask containing the vendor
+ extensions that are compatible with the
+ :c:macro:`RISCV_HWPROBE_BASE_BEHAVIOR_IMA`: base system behavior. A set of
+ CPUs is only compatible with a vendor extension if all CPUs in the set have
+ the same mvendorid and support the extension.
+
+ * T-HEAD
+
+ * :c:macro:`RISCV_ISA_VENDOR_EXT_XTHEADVECTOR`: The xtheadvector vendor
+ extension is supported in the T-Head ISA extensions spec starting from
+ commit a18c801634 ("Add T-Head VECTOR vendor extension. ").

--
2.44.0