From 8ad5f160bf8427b4bcdd70e8dfbd5379e19de1d9 Mon Sep 17 00:00:00 2001
From: np <np@FreeBSD.org>
Date: Fri, 16 Jan 2015 01:32:40 +0000
Subject: [PATCH] Allow cxgbe(4) to be built on i386.  Driver attach will
 succeed only on a subset of i386 systems.

---
 sys/dev/cxgbe/t4_main.c    | 8 ++++++++
 sys/dev/cxgbe/t4_mp_ring.c | 5 +++++
 2 files changed, 13 insertions(+)

diff --git a/sys/dev/cxgbe/t4_main.c b/sys/dev/cxgbe/t4_main.c
index b51ecc5c2c59..dbd6334903ee 100644
--- a/sys/dev/cxgbe/t4_main.c
+++ b/sys/dev/cxgbe/t4_main.c
@@ -668,6 +668,14 @@ t4_attach(device_t dev)
 		goto done;
 	}
 
+#if defined(__i386__)
+	if ((cpu_feature & CPUID_CX8) == 0) {
+		device_printf(dev, "64 bit atomics not available.\n");
+		rc = ENOTSUP;
+		goto done;
+	}
+#endif
+
 	/* Prepare the firmware for operation */
 	rc = prep_firmware(sc);
 	if (rc != 0)
diff --git a/sys/dev/cxgbe/t4_mp_ring.c b/sys/dev/cxgbe/t4_mp_ring.c
index ef09f01b0df4..045a24b87f16 100644
--- a/sys/dev/cxgbe/t4_mp_ring.c
+++ b/sys/dev/cxgbe/t4_mp_ring.c
@@ -38,6 +38,11 @@ __FBSDID("$FreeBSD$");
 
 #include "t4_mp_ring.h"
 
+#if defined(__i386__)
+#define atomic_cmpset_acq_64 atomic_cmpset_64
+#define atomic_cmpset_rel_64 atomic_cmpset_64
+#endif
+
 union ring_state {
 	struct {
 		uint16_t pidx_head;