diff options
author | 2015-08-04 12:17:53 -0700 | |
---|---|---|
committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/powerpc/include/asm/local.h | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/powerpc/include/asm/local.h')
-rw-r--r-- | kernel/arch/powerpc/include/asm/local.h | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/kernel/arch/powerpc/include/asm/local.h b/kernel/arch/powerpc/include/asm/local.h new file mode 100644 index 000000000..b8da91363 --- /dev/null +++ b/kernel/arch/powerpc/include/asm/local.h @@ -0,0 +1,175 @@ +#ifndef _ARCH_POWERPC_LOCAL_H +#define _ARCH_POWERPC_LOCAL_H + +#include <linux/percpu.h> +#include <linux/atomic.h> + +typedef struct +{ + atomic_long_t a; +} local_t; + +#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) } + +#define local_read(l) atomic_long_read(&(l)->a) +#define local_set(l,i) atomic_long_set(&(l)->a, (i)) + +#define local_add(i,l) atomic_long_add((i),(&(l)->a)) +#define local_sub(i,l) atomic_long_sub((i),(&(l)->a)) +#define local_inc(l) atomic_long_inc(&(l)->a) +#define local_dec(l) atomic_long_dec(&(l)->a) + +static __inline__ long local_add_return(long a, local_t *l) +{ + long t; + + __asm__ __volatile__( +"1:" PPC_LLARX(%0,0,%2,0) " # local_add_return\n\ + add %0,%1,%0\n" + PPC405_ERR77(0,%2) + PPC_STLCX "%0,0,%2 \n\ + bne- 1b" + : "=&r" (t) + : "r" (a), "r" (&(l->a.counter)) + : "cc", "memory"); + + return t; +} + +#define local_add_negative(a, l) (local_add_return((a), (l)) < 0) + +static __inline__ long local_sub_return(long a, local_t *l) +{ + long t; + + __asm__ __volatile__( +"1:" PPC_LLARX(%0,0,%2,0) " # local_sub_return\n\ + subf %0,%1,%0\n" + PPC405_ERR77(0,%2) + PPC_STLCX "%0,0,%2 \n\ + bne- 1b" + : "=&r" (t) + : "r" (a), "r" (&(l->a.counter)) + : "cc", "memory"); + + return t; +} + +static __inline__ long local_inc_return(local_t *l) +{ + long t; + + __asm__ __volatile__( +"1:" PPC_LLARX(%0,0,%1,0) " # local_inc_return\n\ + addic %0,%0,1\n" + PPC405_ERR77(0,%1) + PPC_STLCX "%0,0,%1 \n\ + bne- 1b" + : "=&r" (t) + : "r" (&(l->a.counter)) + : "cc", "xer", "memory"); + + return t; +} + +/* + * local_inc_and_test - increment and test + * @l: pointer of type local_t + * + * Atomically increments @l by 1 + * and returns true if the result is zero, or false for all + * other cases. + */ +#define local_inc_and_test(l) (local_inc_return(l) == 0) + +static __inline__ long local_dec_return(local_t *l) +{ + long t; + + __asm__ __volatile__( +"1:" PPC_LLARX(%0,0,%1,0) " # local_dec_return\n\ + addic %0,%0,-1\n" + PPC405_ERR77(0,%1) + PPC_STLCX "%0,0,%1\n\ + bne- 1b" + : "=&r" (t) + : "r" (&(l->a.counter)) + : "cc", "xer", "memory"); + + return t; +} + +#define local_cmpxchg(l, o, n) \ + (cmpxchg_local(&((l)->a.counter), (o), (n))) +#define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n))) + +/** + * local_add_unless - add unless the number is a given value + * @l: pointer of type local_t + * @a: the amount to add to v... + * @u: ...unless v is equal to u. + * + * Atomically adds @a to @l, so long as it was not @u. + * Returns non-zero if @l was not @u, and zero otherwise. + */ +static __inline__ int local_add_unless(local_t *l, long a, long u) +{ + long t; + + __asm__ __volatile__ ( +"1:" PPC_LLARX(%0,0,%1,0) " # local_add_unless\n\ + cmpw 0,%0,%3 \n\ + beq- 2f \n\ + add %0,%2,%0 \n" + PPC405_ERR77(0,%2) + PPC_STLCX "%0,0,%1 \n\ + bne- 1b \n" +" subf %0,%2,%0 \n\ +2:" + : "=&r" (t) + : "r" (&(l->a.counter)), "r" (a), "r" (u) + : "cc", "memory"); + + return t != u; +} + +#define local_inc_not_zero(l) local_add_unless((l), 1, 0) + +#define local_sub_and_test(a, l) (local_sub_return((a), (l)) == 0) +#define local_dec_and_test(l) (local_dec_return((l)) == 0) + +/* + * Atomically test *l and decrement if it is greater than 0. + * The function returns the old value of *l minus 1. + */ +static __inline__ long local_dec_if_positive(local_t *l) +{ + long t; + + __asm__ __volatile__( +"1:" PPC_LLARX(%0,0,%1,0) " # local_dec_if_positive\n\ + cmpwi %0,1\n\ + addi %0,%0,-1\n\ + blt- 2f\n" + PPC405_ERR77(0,%1) + PPC_STLCX "%0,0,%1\n\ + bne- 1b" + "\n\ +2:" : "=&b" (t) + : "r" (&(l->a.counter)) + : "cc", "memory"); + + return t; +} + +/* Use these for per-cpu local_t variables: on some archs they are + * much more efficient than these naive implementations. Note they take + * a variable, not an address. + */ + +#define __local_inc(l) ((l)->a.counter++) +#define __local_dec(l) ((l)->a.counter++) +#define __local_add(i,l) ((l)->a.counter+=(i)) +#define __local_sub(i,l) ((l)->a.counter-=(i)) + +#endif /* _ARCH_POWERPC_LOCAL_H */ |