Add architecture dependent atomic ops (atomic_swap only), KSE specific

data, and userland versions of [gs]etcontext().

Modify the UTS entry and exit functions to account of FPU validity
and format.

1 files changed, 51 insertions, 0 deletions

diff --git a/lib/libkse/arch/i386/include/atomic_ops.h b/lib/libkse/arch/i386/include/atomic_ops.h
new file mode 100644
index 0000000..4d84ae5
--- /dev/null
+++ b/lib/libkse/arch/i386/include/atomic_ops.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2001 Daniel Eischen <deischen@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	_ATOMIC_OPS_H_
+#define	_ATOMIC_OPS_H_
+
+/*
+ * Atomic swap:
+ *   Atomic (tmp = *dst, *dst = val), then *res = tmp
+ *
+ * void atomic_swap_long(long *dst, long val, long *res);
+ */
+static inline void
+atomic_swap_long(long *dst, long val, long *res)
+{
+	__asm __volatile(
+	"xchgl %2, %1; movl %2, %0"
+	 : "=m" (*res) : "m" (*dst), "r" (val) : "memory");
+}
+
+#define	atomic_swap_int(d, v, r) \
+	atomic_swap_long((long *)(d), (long)(v), (long *)(r))
+
+#define	atomic_swap_ptr		atomic_swap_int
+
+#endif