redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

powerpc: Merge spinlock.h 

The result is mostly similar to the original ppc64 version but with
some adaptations for 32-bit compilation.

include/asm-ppc64 is now empty!

Signed-off-by: Paul Mackerras <paulus@samba.org>
hifive-unleashed-5.1
Paul Mackerras 2005-11-19 20:50:46 +11:00
parent 21a6290220
commit 0212ddd839
1 changed files with 50 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

72
include/asm-ppc64/spinlock.h → include/asm-powerpc/spinlock.h
View File

@ -18,31 +18,41 @@
*
* (the type definitions are in asm/spinlock_types.h)
*/
#include <linux/config.h>
#ifdef CONFIG_PPC64
#include <asm/paca.h>
#include <asm/hvcall.h>
#include <asm/iseries/hv_call.h>
#endif
#include <asm/asm-compat.h>
#include <asm/synch.h>
#define __raw_spin_is_locked(x) ((x)->slock != 0)
#ifdef CONFIG_PPC64
/* use 0x800000yy when locked, where yy == CPU number */
#define LOCK_TOKEN (*(u32 *)(&get_paca()->lock_token))
#else
#define LOCK_TOKEN 1
#endif
/*
* This returns the old value in the lock, so we succeeded
* in getting the lock if the return value is 0.
*/
static __inline__ unsigned long __spin_trylock(raw_spinlock_t *lock)
{
unsigned long tmp, tmp2;
unsigned long tmp, token;
token = LOCK_TOKEN;
__asm__ __volatile__(
" lwz %1,%3(13) # __spin_trylock\n\
1: lwarx %0,0,%2\n\
"1: lwarx %0,0,%2 # __spin_trylock\n\
cmpwi 0,%0,0\n\
bne- 2f\n\
stwcx. %1,0,%2\n\
bne- 1b\n\
isync\n\
2:" : "=&r" (tmp), "=&r" (tmp2)
: "r" (&lock->slock), "i" (offsetof(struct paca_struct, lock_token))
2:" : "=&r" (tmp)
: "r" (token), "r" (&lock->slock)
: "cr0", "memory");
return tmp;
@ -113,11 +123,17 @@ static void __inline__ __raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long
static __inline__ void __raw_spin_unlock(raw_spinlock_t *lock)
{
__asm__ __volatile__("lwsync # __raw_spin_unlock": : :"memory");
__asm__ __volatile__(SYNC_ON_SMP" # __raw_spin_unlock"
: : :"memory");
lock->slock = 0;
}
#ifdef CONFIG_PPC64
extern void __raw_spin_unlock_wait(raw_spinlock_t *lock);
#else
#define __raw_spin_unlock_wait(lock) \
do { while (__raw_spin_is_locked(lock)) cpu_relax(); } while (0)
#endif
/*
* Read-write spinlocks, allowing multiple readers
@ -133,6 +149,14 @@ extern void __raw_spin_unlock_wait(raw_spinlock_t *lock);
#define __raw_read_can_lock(rw) ((rw)->lock >= 0)
#define __raw_write_can_lock(rw) (!(rw)->lock)
#ifdef CONFIG_PPC64
#define __DO_SIGN_EXTEND "extsw %0,%0\n"
#define WRLOCK_TOKEN LOCK_TOKEN /* it's negative */
#else
#define __DO_SIGN_EXTEND
#define WRLOCK_TOKEN (-1)
#endif
/*
* This returns the old value in the lock + 1,
* so we got a read lock if the return value is > 0.
@ -142,11 +166,12 @@ static long __inline__ __read_trylock(raw_rwlock_t *rw)
long tmp;
__asm__ __volatile__(
"1: lwarx %0,0,%1 # read_trylock\n\
extsw %0,%0\n\
addic. %0,%0,1\n\
ble- 2f\n\
stwcx. %0,0,%1\n\
"1: lwarx %0,0,%1 # read_trylock\n"
__DO_SIGN_EXTEND
" addic. %0,%0,1\n\
ble- 2f\n"
PPC405_ERR77(0,%1)
" stwcx. %0,0,%1\n\
bne- 1b\n\
isync\n\
2:" : "=&r" (tmp)
@ -162,18 +187,19 @@ static long __inline__ __read_trylock(raw_rwlock_t *rw)
*/
static __inline__ long __write_trylock(raw_rwlock_t *rw)
{
long tmp, tmp2;
long tmp, token;
token = WRLOCK_TOKEN;
__asm__ __volatile__(
" lwz %1,%3(13) # write_trylock\n\
1: lwarx %0,0,%2\n\
"1: lwarx %0,0,%2 # write_trylock\n\
cmpwi 0,%0,0\n\
bne- 2f\n\
stwcx. %1,0,%2\n\
bne- 2f\n"
PPC405_ERR77(0,%1)
" stwcx. %1,0,%2\n\
bne- 1b\n\
isync\n\
2:" : "=&r" (tmp), "=&r" (tmp2)
: "r" (&rw->lock), "i" (offsetof(struct paca_struct, lock_token))
2:" : "=&r" (tmp)
: "r" (token), "r" (&rw->lock)
: "cr0", "memory");
return tmp;
@ -224,8 +250,9 @@ static void __inline__ __raw_read_unlock(raw_rwlock_t *rw)
__asm__ __volatile__(
"eieio # read_unlock\n\
1: lwarx %0,0,%1\n\
addic %0,%0,-1\n\
stwcx. %0,0,%1\n\
addic %0,%0,-1\n"
PPC405_ERR77(0,%1)
" stwcx. %0,0,%1\n\
bne- 1b"
: "=&r"(tmp)
: "r"(&rw->lock)
@ -234,7 +261,8 @@ static void __inline__ __raw_read_unlock(raw_rwlock_t *rw)
static __inline__ void __raw_write_unlock(raw_rwlock_t *rw)
{
__asm__ __volatile__("lwsync # write_unlock": : :"memory");
__asm__ __volatile__(SYNC_ON_SMP" # write_unlock"
: : :"memory");
rw->lock = 0;
}