diff options
| author | Xiang Wang <wxjstz@126.com> | 2018-07-08 10:01:14 +0800 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2018-09-04 12:35:47 +0000 |
| commit | 3b5351d0444f028ebdb5d06ee51197e516b0c31e (patch) | |
| tree | 665f382c05c786bcd965308fb3a48ee099a58994 | |
| parent | 33354ddaa8bf067b86e283814fc3f03a02b1dfe5 (diff) | |
riscv: add spin lock support
Add spin lock support for riscv.
Change-Id: I7e93fb8b35c4452f0fe3f7f4bcc6f7aa4e042451
Signed-off-by: Xiang Wang <wxjstz@126.com>
Reviewed-on: https://review.coreboot.org/27356
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
| -rw-r--r-- | src/arch/riscv/include/arch/smp/spinlock.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/arch/riscv/include/arch/smp/spinlock.h b/src/arch/riscv/include/arch/smp/spinlock.h index bdf8ec4584..dc561d30a1 100644 --- a/src/arch/riscv/include/arch/smp/spinlock.h +++ b/src/arch/riscv/include/arch/smp/spinlock.h @@ -1,6 +1,8 @@ /* * This file is part of the coreboot project. * + * Copyright (C) 2018 HardenedLinux. + * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. @@ -10,3 +12,29 @@ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ +#ifndef ARCH_SMP_SPINLOCK_H +#define ARCH_SMP_SPINLOCK_H + +#include <arch/encoding.h> +#include <arch/smp/atomic.h> + +#define barrier() { asm volatile ("fence" ::: "memory"); } + +typedef struct { + volatile atomic_t lock; +} spinlock_t; + +static inline void spinlock_lock(spinlock_t *lock) +{ + while (atomic_swap(&lock->lock, -1)) + ; + barrier(); +} + +static inline void spinlock_unlock(spinlock_t *lock) +{ + barrier(); + atomic_set(&lock->lock, 0); +} + +#endif // ARCH_SMP_SPINLOCK_H |