diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/libc_r/arch/powerpc/_atomic_lock.c | 43 | ||||
| -rw-r--r-- | lib/libc_r/arch/powerpc/_spinlock.h | 6 | ||||
| -rw-r--r-- | lib/libc_r/arch/powerpc/uthread_machdep.h | 31 | ||||
| -rw-r--r-- | lib/libpthread/arch/powerpc/_atomic_lock.c | 43 | ||||
| -rw-r--r-- | lib/libpthread/arch/powerpc/_spinlock.h | 6 | ||||
| -rw-r--r-- | lib/libpthread/arch/powerpc/uthread_machdep.h | 31 |
6 files changed, 160 insertions, 0 deletions
diff --git a/lib/libc_r/arch/powerpc/_atomic_lock.c b/lib/libc_r/arch/powerpc/_atomic_lock.c new file mode 100644 index 00000000000..ab1a5321763 --- /dev/null +++ b/lib/libc_r/arch/powerpc/_atomic_lock.c @@ -0,0 +1,43 @@ +/* $OpenBSD: _atomic_lock.c,v 1.1 1998/12/21 07:22:26 d Exp $ */ +/* + * Atomic lock for powerpc + */ + +#include "spinlock.h" + +int +_atomic_lock(volatile _spinlock_lock_t *lock) +{ + _spinlock_lock_t old; + + __asm__("1: lwarx %0,0,%1 \n" + " stwcx. %2,0,%1 \n" + " bne- 1b \n" + : "=r" (old), "=r" (lock) + : "r" (_SPINLOCK_LOCKED), "1" (lock) + ); + + return (old != _SPINLOCK_UNLOCKED); + + /* + * Dale <rahnds@openbsd.org> sez: + * Side note. to prevent two processes from accessing + * the same address with the lwarx in one instrution + * and the stwcx in another process, the current powerpc + * kernel uses a lwarx instruction without the corresponding + * stwcx which effectively causes any reservation of a + * process to be removed. if a context switch occurs + * between the two accesses the store will not occur + * and the condition code will cause it to loop. If on + * a dual processor machine, the reserve will cause + * appropriate bus cycle accesses to notify other + * processors. + */ +} + +int +_atomic_is_locked(volatile _spinlock_lock_t *lock) +{ + + return (*lock != _SPINLOCK_UNLOCKED); +} diff --git a/lib/libc_r/arch/powerpc/_spinlock.h b/lib/libc_r/arch/powerpc/_spinlock.h new file mode 100644 index 00000000000..a1e95b6aafa --- /dev/null +++ b/lib/libc_r/arch/powerpc/_spinlock.h @@ -0,0 +1,6 @@ +/* $OpenBSD: _spinlock.h,v 1.1 1998/12/21 07:22:26 d Exp $ */ + +#define _SPINLOCK_UNLOCKED (0) +#define _SPINLOCK_LOCKED (1) +typedef register_t _spinlock_lock_t; + diff --git a/lib/libc_r/arch/powerpc/uthread_machdep.h b/lib/libc_r/arch/powerpc/uthread_machdep.h new file mode 100644 index 00000000000..3ba790a49c2 --- /dev/null +++ b/lib/libc_r/arch/powerpc/uthread_machdep.h @@ -0,0 +1,31 @@ +/* + * OpenBSD/powerpc machine-dependent thread macros + * + * $OpenBSD: uthread_machdep.h,v 1.1 1998/12/21 07:22:26 d Exp $ + */ + +/* save the floating point state of a thread */ +#define _thread_machdep_save_float_state(thr) \ + { \ + /* rahnds to fill in */ \ + } + +/* restore the floating point state of a thread */ +#define _thread_machdep_restore_float_state(thr) \ + { \ + /* rahnds to fill in */ \ + } + +/* initialise the jmpbuf stack frame so it continues from entry */ +#define _thread_machdep_thread_create(thr, entry, pattr) \ + { \ + /* rahnds to fill in */ \ + } + +#define _thread_machdep_longjmp(a,v) longjmp(a,v) +#define _thread_machdep_setjmp(a) setjmp(a) + +struct _machdep_struct { + char xxx; +}; + diff --git a/lib/libpthread/arch/powerpc/_atomic_lock.c b/lib/libpthread/arch/powerpc/_atomic_lock.c new file mode 100644 index 00000000000..ab1a5321763 --- /dev/null +++ b/lib/libpthread/arch/powerpc/_atomic_lock.c @@ -0,0 +1,43 @@ +/* $OpenBSD: _atomic_lock.c,v 1.1 1998/12/21 07:22:26 d Exp $ */ +/* + * Atomic lock for powerpc + */ + +#include "spinlock.h" + +int +_atomic_lock(volatile _spinlock_lock_t *lock) +{ + _spinlock_lock_t old; + + __asm__("1: lwarx %0,0,%1 \n" + " stwcx. %2,0,%1 \n" + " bne- 1b \n" + : "=r" (old), "=r" (lock) + : "r" (_SPINLOCK_LOCKED), "1" (lock) + ); + + return (old != _SPINLOCK_UNLOCKED); + + /* + * Dale <rahnds@openbsd.org> sez: + * Side note. to prevent two processes from accessing + * the same address with the lwarx in one instrution + * and the stwcx in another process, the current powerpc + * kernel uses a lwarx instruction without the corresponding + * stwcx which effectively causes any reservation of a + * process to be removed. if a context switch occurs + * between the two accesses the store will not occur + * and the condition code will cause it to loop. If on + * a dual processor machine, the reserve will cause + * appropriate bus cycle accesses to notify other + * processors. + */ +} + +int +_atomic_is_locked(volatile _spinlock_lock_t *lock) +{ + + return (*lock != _SPINLOCK_UNLOCKED); +} diff --git a/lib/libpthread/arch/powerpc/_spinlock.h b/lib/libpthread/arch/powerpc/_spinlock.h new file mode 100644 index 00000000000..a1e95b6aafa --- /dev/null +++ b/lib/libpthread/arch/powerpc/_spinlock.h @@ -0,0 +1,6 @@ +/* $OpenBSD: _spinlock.h,v 1.1 1998/12/21 07:22:26 d Exp $ */ + +#define _SPINLOCK_UNLOCKED (0) +#define _SPINLOCK_LOCKED (1) +typedef register_t _spinlock_lock_t; + diff --git a/lib/libpthread/arch/powerpc/uthread_machdep.h b/lib/libpthread/arch/powerpc/uthread_machdep.h new file mode 100644 index 00000000000..3ba790a49c2 --- /dev/null +++ b/lib/libpthread/arch/powerpc/uthread_machdep.h @@ -0,0 +1,31 @@ +/* + * OpenBSD/powerpc machine-dependent thread macros + * + * $OpenBSD: uthread_machdep.h,v 1.1 1998/12/21 07:22:26 d Exp $ + */ + +/* save the floating point state of a thread */ +#define _thread_machdep_save_float_state(thr) \ + { \ + /* rahnds to fill in */ \ + } + +/* restore the floating point state of a thread */ +#define _thread_machdep_restore_float_state(thr) \ + { \ + /* rahnds to fill in */ \ + } + +/* initialise the jmpbuf stack frame so it continues from entry */ +#define _thread_machdep_thread_create(thr, entry, pattr) \ + { \ + /* rahnds to fill in */ \ + } + +#define _thread_machdep_longjmp(a,v) longjmp(a,v) +#define _thread_machdep_setjmp(a) setjmp(a) + +struct _machdep_struct { + char xxx; +}; + |