[PATCH] [procd] system: add RISC-V CPU info

[Yu Chien Peter Lin]

This patch adds the missing information about RISC-V architecture,
which has been supported by OpenWrt. Currently, LuCI shows "?" at the
field of Architecture, we add "RISC-V" with isa string parsed from
/proc/cpuinfo.

For example, the following platform generates "RISC-V (rv64imafdc)":

root at OpenWrt:/# cat /proc/cpuinfo
processor       : 0
hart            : 0
isa             : rv64imafdc
mmu             : sv48
mvendorid       : 0x31e
marchid         : 0x8000000000008a45
mimpid          : 0x820

Signed-off-by: Yu Chien Peter Lin <peterlin at andestech.com>
---
 system.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/system.c b/system.c
index 93eac59..1f2be33 100644
--- a/system.c
+++ b/system.c
@@ -153,6 +153,12 @@ static int system_board(struct ubus_context *ctx, struct ubus_object *obj,
 				blobmsg_add_string(&b, "system", line);
 				break;
 			}
+#elif __riscv
+			if (!strcasecmp(key, "isa")) {
+				snprintf(line, sizeof(line), "RISC-V (%s)", val + 2);
+				blobmsg_add_string(&b, "system", line);
+				break;
+			}
 #else
 			if (!strcasecmp(key, "system type") ||
 			    !strcasecmp(key, "processor") ||
-- 
2.34.1