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/* Machine-dependent pthreads configuration and inline functions.
nios2 version.
Copyright (C) 1996, 1998, 2000, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser 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. */
#ifndef _PT_MACHINE_H
#define _PT_MACHINE_H 1
#ifndef PT_EI
# define PT_EI extern inline
#endif
extern long int testandset (int *spinlock);
/* Spinlock implementation; required. */
PT_EI long int
testandset (int *spinlock)
{
unsigned int scratch;
long int ret=-2;
__asm__ __volatile__(
"rdctl %0, status\n\t"
"and %0, %0, %1\n\t"
"wrctl status, %0 #disable interrupts\n\t"
"ldw %1, 0(%4)\n\t"
"stw %3, 0(%4)\n\t"
"ori %0, %0, 1\n\t"
"wrctl status, %0 #enable interrupts\n\t"
: "=&r"(scratch), "=r"(ret)
: "1"(ret), "r"(1), "r"(spinlock)
: "memory");
return ret;
}
/* 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__ ("%sp");
#endif /* pt-machine.h */
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