From 01573e231f18eb2d99162747186f59511f56b64d Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 08 Dec 2023 10:40:48 +0000
Subject: [PATCH] 移去rt
---
kernel/arch/arc/kernel/fpu.c | 37 ++++++++++++++++++++++++++++++++-----
1 files changed, 32 insertions(+), 5 deletions(-)
diff --git a/kernel/arch/arc/kernel/fpu.c b/kernel/arch/arc/kernel/fpu.c
index f352e51..ec64021 100644
--- a/kernel/arch/arc/kernel/fpu.c
+++ b/kernel/arch/arc/kernel/fpu.c
@@ -1,15 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* fpu.c - save/restore of Floating Point Unit Registers on task switch
*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
*/
#include <linux/sched.h>
-#include <asm/switch_to.h>
+#include <asm/fpu.h>
+
+#ifdef CONFIG_ISA_ARCOMPACT
/*
* To save/restore FPU regs, simplest scheme would use LR/SR insns.
@@ -53,3 +52,31 @@
: "r" (zero), "r" (*(readfrom + 3)), "r" (*(readfrom + 2))
);
}
+
+#else
+
+void fpu_init_task(struct pt_regs *regs)
+{
+ const unsigned int fwe = 0x80000000;
+
+ /* default rounding mode */
+ write_aux_reg(ARC_REG_FPU_CTRL, 0x100);
+
+ /* Initialize to zero: setting requires FWE be set */
+ write_aux_reg(ARC_REG_FPU_STATUS, fwe);
+}
+
+void fpu_save_restore(struct task_struct *prev, struct task_struct *next)
+{
+ struct arc_fpu *save = &prev->thread.fpu;
+ struct arc_fpu *restore = &next->thread.fpu;
+ const unsigned int fwe = 0x80000000;
+
+ save->ctrl = read_aux_reg(ARC_REG_FPU_CTRL);
+ save->status = read_aux_reg(ARC_REG_FPU_STATUS);
+
+ write_aux_reg(ARC_REG_FPU_CTRL, restore->ctrl);
+ write_aux_reg(ARC_REG_FPU_STATUS, (fwe | restore->status));
+}
+
+#endif
--
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