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- /*
- * Copyright 2012 Calxeda, Inc.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope 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_ARM_PERCPU_H_
- #define _ASM_ARM_PERCPU_H_
- /*
- * Same as asm-generic/percpu.h, except that we store the per cpu offset
- * in the TPIDRPRW. TPIDRPRW only exists on V6K and V7
- */
- #if defined(CONFIG_SMP) && !defined(CONFIG_CPU_V6)
- static inline void set_my_cpu_offset(unsigned long off)
- {
- /* Set TPIDRPRW */
- asm volatile("mcr p15, 0, %0, c13, c0, 4" : : "r" (off) : "memory");
- }
- static inline unsigned long __my_cpu_offset(void)
- {
- unsigned long off;
- /*
- * Read TPIDRPRW.
- * We want to allow caching the value, so avoid using volatile and
- * instead use a fake stack read to hazard against barrier().
- */
- asm("mrc p15, 0, %0, c13, c0, 4" : "=r" (off)
- : "Q" (*(const unsigned long *)current_stack_pointer));
- return off;
- }
- #define __my_cpu_offset __my_cpu_offset()
- #else
- #define set_my_cpu_offset(x) do {} while(0)
- #endif /* CONFIG_SMP */
- #include <asm-generic/percpu.h>
- #endif /* _ASM_ARM_PERCPU_H_ */
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