mirror of
https://github.com/fail0verflow/switch-coreboot.git
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b636ab9cf1
the Linux kernel (as far as possible). The code is a lot simpler and shorter now. Also, add cpu_relax() (which is also part of the Linux file) which could be useful for busy-loops (but is currently not used). Drop the cpu_relax() from spinlock.h as it's not spinlock related in any way. The code builds, and works in QEMU, but is not tested on hardware. Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de> Acked-by: Stefan Reinauer <stepan@coresystems.de> git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@423 f3766cd6-281f-0410-b1cd-43a5c92072e9
44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
/*
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* This file is part of the LinuxBIOS project.
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*
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* Copyright (C) 2001 Linux Networx
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef SPINLOCK_H
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#define SPINLOCK_H
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#if defined(CONFIG_SMP) && CONFIG_SMP == 1
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#include <arch/spinlock.h>
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#else /* !CONFIG_SMP */
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/* Most GCC versions have a nasty bug with empty initializers */
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#if (__GNUC__ > 2)
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typedef struct { } spinlock_t;
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#define SPIN_LOCK_UNLOCKED (spinlock_t) { }
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#else
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typedef struct { int gcc_is_buggy; } spinlock_t;
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#define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 }
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#endif
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#define barrier() do {} while(0)
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#define spin_is_locked(lock) 0
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#define spin_unlock_wait(lock) do {} while(0)
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#define spin_lock(lock) do {} while(0)
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#define spin_unlock(lock) do {} while(0)
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#endif
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#endif /* SPINLOCK_H */
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