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@@ -0,0 +1,61 @@
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+/*
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+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
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+ */
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+
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+#ifndef _PT_MACHINE_H
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+#define _PT_MACHINE_H 1
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+#include <features.h>
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+
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+#ifndef PT_EI
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+# define PT_EI __extern_always_inline
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+#endif
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+
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+#define HAS_COMPARE_AND_SWAP
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+PT_EI int
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+__compare_and_swap (long int *p, long int oldval, long int newval)
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+{
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+ long int ret, temp;
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+
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+ __asm__ __volatile__
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+ ("/* Inline compare & swap */\n"
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+ "1:\n\t"
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+ "lr.d %1,%2\n\t"
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+ "li %0,0\n\t"
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+ "bne %1,%3,2f\n\t"
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+ "li %0,1\n\t"
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+ "sc.d %1,%4,%2\n\t"
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+ "bnez %1,1b\n"
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+ "2:\n\t"
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+ "/* End compare & swap */"
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+ : "=&r" (ret), "=&r" (temp), "+A" (*p)
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+ : "r" (oldval), "r" (newval)
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+ : "memory");
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+
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+ return ret;
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+}
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+
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+extern long int testandset (int *spinlock);
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+
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+PT_EI long int
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+testandset (int *spinlock)
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+{
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+ unsigned int old = 1;
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+ int tmp = 1;
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+
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+ __asm__ __volatile__ (
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+ "amoswap.w %0, %2, %1"
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+ : "=r" (old), "+A" (*spinlock)
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+ : "r" (tmp)
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+ : "memory");
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+
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+ return old;
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+}
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+
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+/* Get some notion of the current stack. Need not be exactly the top
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+ of the stack, just something somewhere in the current frame. */
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+#define CURRENT_STACK_FRAME stack_pointer
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+register char * stack_pointer __asm__ ("sp");
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+
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+#else
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+#error PT_MACHINE already defined
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+#endif /* pt-machine.h */
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