1 files changed, 84 insertions, 0 deletions
diff --git a/linuxthreads/sysdeps/powerpc/pt-machine.h b/linuxthreads/sysdeps/powerpc/pt-machine.h
new file mode 100644
index 0000000000..a08828b322
--- /dev/null
+++ b/linuxthreads/sysdeps/powerpc/pt-machine.h
@@ -0,0 +1,84 @@
+/* Machine-dependent pthreads configuration and inline functions.
+   powerpc version.
+   Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Richard Henderson <rth@tamu.edu>.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If
+   not, write to the Free Software Foundation, Inc.,
+   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* These routines are from Appendix G of the 'PowerPC 601 RISC Microprocessor
+   User's Manual', by IBM and Motorola.  */
+
+/* For multiprocessor systems, we want to ensure all memory accesses
+   are completed before we reset a lock.  */
+#if 0
+/* on non multiprocessor systems, you can just: */
+#define sync() /* nothing */
+#else
+#define sync() __asm__ __volatile__ ("sync")
+#endif
+
+/* Spinlock implementation; required.  */
+extern inline int
+testandset (int *spinlock)
+{
+  int ret;
+
+  sync();
+  __asm__ __volatile__(
+		       "0:    lwarx %0,0,%1 ;"
+		       "      cmpwi %0,0;"
+		       "      bne 1f;"
+		       "      stwcx. %2,0,%1;"
+		       "      bne- 0b;"
+		       "1:    "
+	: "=&r"(ret)
+	: "r"(spinlock), "r"(1)
+	: "cr0", "memory");
+  sync();
+
+  return ret != 0;
+}
+
+
+/* Get some notion of the current stack.  Need not be exactly the top
+   of the stack, just something somewhere in the current frame.  */
+#define CURRENT_STACK_FRAME  stack_pointer
+register char * stack_pointer __asm__ ("r1");
+
+/* Compare-and-swap for semaphores. */
+/* note that test-and-set(x) is the same as compare-and-swap(x, 0, 1) */
+
+#define HAS_COMPARE_AND_SWAP
+extern inline int
+__compare_and_swap (int *p, int oldval, int newval)
+{
+  int ret;
+
+  sync();
+  __asm__ __volatile__(
+		       "0:    lwarx %0,0,%1 ;"
+		       "      xor. %0,%3,%0;"
+		       "      bne 1f;"
+		       "      stwcx. %2,0,%1;"
+		       "      bne- 0b;"
+		       "1:    "
+	: "=&r"(ret)
+	: "r"(p), "r"(newval), "r"(oldval)
+	: "cr0", "memory");
+  sync();
+  return ret == 0;
+}