From 12657df52a5e4bf144808b87602e91495285d525 Mon Sep 17 00:00:00 2001
From: Piotr Kubaj <pkubaj@FreeBSD.org>
Date: Tue, 1 Apr 2025 13:18:38 +0000
Subject: [PATCH] simd_powerpc.h: enable FPU on FreeBSD

FreeBSD nowadays supports FPU in the kernel on powerpc*, so enable it.

Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Piotr Kubaj <pkubaj@FreeBSD.org>
Closes #17191
---
 include/os/freebsd/spl/sys/simd_powerpc.h | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/include/os/freebsd/spl/sys/simd_powerpc.h b/include/os/freebsd/spl/sys/simd_powerpc.h
index 7e7abd992..5596f35a6 100644
--- a/include/os/freebsd/spl/sys/simd_powerpc.h
+++ b/include/os/freebsd/spl/sys/simd_powerpc.h
@@ -49,11 +49,18 @@
 
 #include <machine/pcb.h>
 #include <machine/cpu.h>
+#include <machine/fpu.h>
 
-#define	kfpu_allowed()		0
+#define	kfpu_allowed()		1
 #define	kfpu_initialize(tsk)	do {} while (0)
-#define	kfpu_begin()		do {} while (0)
-#define	kfpu_end()		do {} while (0)
+#define	kfpu_begin() {					\
+	if (__predict_false(!is_fpu_kern_thread(0)))	\
+	fpu_kern_enter(PCPU_GET(curthread), NULL, FPU_KERN_NOCTX);\
+}
+#define	kfpu_end()	{				\
+	if (__predict_false(PCPU_GET(curpcb)->pcb_flags & PCB_KERN_FPU_NOSAVE))\
+	fpu_kern_leave(PCPU_GET(curthread), NULL);	\
+}
 #define	kfpu_init()		(0)
 #define	kfpu_fini()		do {} while (0)