riscv: Add SiFive xsfvfnrclipxfqf vendor extension

Add SiFive vendor extension "xsfvfnrclipxfqf" support to the kernel.

Signed-off-by: Cyan Yang <cyan.yang@sifive.com>
Link: https://lore.kernel.org/r/20250418053239.4351-7-cyan.yang@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

arch/riscv/include/asm/vendor_extensions/sifive.h

@@ -8,6 +8,7 @@
 
 #define RISCV_ISA_VENDOR_EXT_XSFVQMACCDOD		0
 #define RISCV_ISA_VENDOR_EXT_XSFVQMACCQOQ		1
+#define RISCV_ISA_VENDOR_EXT_XSFVFNRCLIPXFQF		2
 
 extern struct riscv_isa_vendor_ext_data_list riscv_isa_vendor_ext_list_sifive;
 

arch/riscv/kernel/vendor_extensions/sifive.c

@@ -9,6 +9,7 @@
 
 /* All SiFive vendor extensions supported in Linux */
 const struct riscv_isa_ext_data riscv_isa_vendor_ext_sifive[] = {
+	__RISCV_ISA_EXT_DATA(xsfvfnrclipxfqf, RISCV_ISA_VENDOR_EXT_XSFVFNRCLIPXFQF),
 	__RISCV_ISA_EXT_DATA(xsfvqmaccdod, RISCV_ISA_VENDOR_EXT_XSFVQMACCDOD),
 	__RISCV_ISA_EXT_DATA(xsfvqmaccqoq, RISCV_ISA_VENDOR_EXT_XSFVQMACCQOQ),
 };