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/* Machine-dependent pthreads configuration and inline functions.
ARM version.
Copyright (C) 1997, 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Philip Blundell <philb@gnu.org>.
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. */
#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. */
/* it is weird and dangerous to disable interrupt in userspace, but for nios
what else we can do before we have a swap like instruction? This is better
than nothing
*/
PT_EI long int
testandset (int *spinlock)
{
unsigned int ret;
__asm__ __volatile__("pfx 8\n\t"
"wrctl %1 ; disable interrupt\n\t"
"nop\n\t"
"nop\n\t"
"ld %0, [%2]\n\t"
"st [%2], %1\n\t"
"pfx 9\n\t"
"wrctl %1 ; enable interrupt\n\t"
"nop\n\t"
"nop\n\t"
: "=&r"(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");
/* nios needs more because of reg windows */
#define THREAD_MANAGER_STACK_SIZE (32*1024)
#define STACK_SIZE (32*1024)
#endif /* pt-machine.h */
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