08e875c16a
This patch adds SMP initialisation and spinlocks implementation for AArch64. The spinlock support uses the new load-acquire/store-release instructions to avoid explicit barriers. The architecture also specifies that an event is automatically generated when clearing the exclusive monitor state to wake up processors in WFE, so there is no need for an explicit DSB/SEV instruction sequence. The SEVL instruction is used to set the exclusive monitor locally as there is no conditional WFE and a branch is more expensive. For the SMP booting protocol, see Documentation/arm64/booting.txt. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
/*
|
|
* Copyright (C) 2012 ARM Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#ifndef __ASM_SPINLOCK_TYPES_H
|
|
#define __ASM_SPINLOCK_TYPES_H
|
|
|
|
#if !defined(__LINUX_SPINLOCK_TYPES_H) && !defined(__ASM_SPINLOCK_H)
|
|
# error "please don't include this file directly"
|
|
#endif
|
|
|
|
/* We only require natural alignment for exclusive accesses. */
|
|
#define __lock_aligned
|
|
|
|
typedef struct {
|
|
volatile unsigned int lock;
|
|
} arch_spinlock_t;
|
|
|
|
#define __ARCH_SPIN_LOCK_UNLOCKED { 0 }
|
|
|
|
typedef struct {
|
|
volatile unsigned int lock;
|
|
} arch_rwlock_t;
|
|
|
|
#define __ARCH_RW_LOCK_UNLOCKED { 0 }
|
|
|
|
#endif
|