Add compilation support for loongarch64 arch

Configurations/10-main.conf

@@ -736,6 +736,13 @@ sub vms_info {
         shared_ldflag    => add("-mabi=64"),
         multilib         => "64",
     },
+    "linux64-loongarch64" => {
+        inherit_from     => [ "linux-generic64" ],
+        cflags           => add("-mabi=lp64"),
+        perlasm_scheme   => "64",
+        shared_ldflag    => add("-mabi=lp64"),
+        multilib         => "64",
+    },
 
     #### IA-32 targets...
     #### These two targets are a bit aged and are to be used on older Linux

config

@@ -565,6 +565,7 @@ case "$GUESSOS" in
 	OUT="linux-mips64"
 	;;
   mips*-*-linux2) OUT="linux-mips32" ;;
+  loongarch64-*-linux2) OUT="linux64-loongarch64" ;;
   ppc60x-*-vxworks*) OUT="vxworks-ppc60x" ;;
   ppcgen-*-vxworks*) OUT="vxworks-ppcgen" ;;
   pentium-*-vxworks*) OUT="vxworks-pentium" ;;

engines/afalg/e_afalg.c

@@ -105,9 +105,14 @@ static ossl_inline int io_setup(unsigned n, aio_context_t *ctx)
     return syscall(__NR_io_setup, n, ctx);
 }
 
+/* Add __NR_eventfd2 syscall for loongarch64 architecture */
 static ossl_inline int eventfd(int n)
 {
+#ifdef __loongarch64
+    return syscall(__NR_eventfd2, n);
+#else	
     return syscall(__NR_eventfd, n);
+#endif    
 }
 
 static ossl_inline int io_destroy(aio_context_t ctx)