riscv: Print ISA extensions

Report the CPU's single-letter ISA extensions in printcpuinfo().

Reviewed by:	markj
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D39813

1 files changed, 7 insertions, 0 deletions

diff --git a/sys/riscv/riscv/identcpu.c b/sys/riscv/riscv/identcpu.c
index 6d82e4a2ad77..d4ad8a1078b6 100644
--- a/sys/riscv/riscv/identcpu.c
+++ b/sys/riscv/riscv/identcpu.c
@@ -429,5 +429,12 @@ printcpuinfo(u_int cpu)
 		    desc->cpu_mvendor_name, desc->cpu_march_name, hart);
 
 		printf("  marchid=%#lx, mimpid=%#lx\n", marchid, mimpid);
+		printf("  ISA: %#b\n", desc->isa_extensions,
+		    "\020"
+		    "\01Atomic"
+		    "\03Compressed"
+		    "\04Double"
+		    "\06Float"
+		    "\15Mult/Div");
 	}
 }