From f5e706ad886b6a5eb59637830110b09ccebf01c5 Mon Sep 17 00:00:00 2001 From: Sam Ravnborg Date: Thu, 17 Jul 2008 21:55:51 -0700 Subject: sparc: join the remaining header files With this commit all sparc64 header files are moved to asm-sparc. The remaining files (71 files) were too different to be trivially merged so divide them up in a _32.h and a _64.h file which are both included from the file with no bit size. The following script were used: cd include FILES=`wc -l asm-sparc64/*h | grep -v '^ 1' | cut -b 20-` for FILE in ${FILES}; do echo $FILE: BASE=`echo $FILE | cut -d '.' -f 1` FN32=${BASE}_32.h FN64=${BASE}_64.h GUARD=___ASM_SPARC_`echo $BASE | tr '-' '_' | tr [:lower:] [:upper:]`_H git mv asm-sparc/$FILE asm-sparc/$FN32 git mv asm-sparc64/$FILE asm-sparc/$FN64 echo git mv done printf "#ifndef %s\n" $GUARD > asm-sparc/$FILE printf "#define %s\n" $GUARD >> asm-sparc/$FILE printf "#if defined(__sparc__) && defined(__arch64__)\n" >> asm-sparc/$FILE printf "#include \n" $FN64 >> asm-sparc/$FILE printf "#else\n" >> asm-sparc/$FILE printf "#include \n" $FN32 >> asm-sparc/$FILE printf "#endif\n" >> asm-sparc/$FILE printf "#endif\n" >> asm-sparc/$FILE git add asm-sparc/$FILE echo new file done printf "#include \n" $FILE > asm-sparc64/$FILE git add asm-sparc64/$FILE echo sparc64 file done done The guard contains three '_' to avoid conflict with existing guards. In additing the two Kbuild files are emptied to avoid breaking headers_* targets. We will reintroduce the exported header files when the necessary kbuild changes are merged. Signed-off-by: Sam Ravnborg Signed-off-by: David S. Miller --- include/asm-sparc/spinlock_32.h | 192 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 192 insertions(+) create mode 100644 include/asm-sparc/spinlock_32.h (limited to 'include/asm-sparc/spinlock_32.h') diff --git a/include/asm-sparc/spinlock_32.h b/include/asm-sparc/spinlock_32.h new file mode 100644 index 0000000..de2249b --- /dev/null +++ b/include/asm-sparc/spinlock_32.h @@ -0,0 +1,192 @@ +/* spinlock.h: 32-bit Sparc spinlock support. + * + * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) + */ + +#ifndef __SPARC_SPINLOCK_H +#define __SPARC_SPINLOCK_H + +#include /* For NR_CPUS */ + +#ifndef __ASSEMBLY__ + +#include + +#define __raw_spin_is_locked(lock) (*((volatile unsigned char *)(lock)) != 0) + +#define __raw_spin_unlock_wait(lock) \ + do { while (__raw_spin_is_locked(lock)) cpu_relax(); } while (0) + +static inline void __raw_spin_lock(raw_spinlock_t *lock) +{ + __asm__ __volatile__( + "\n1:\n\t" + "ldstub [%0], %%g2\n\t" + "orcc %%g2, 0x0, %%g0\n\t" + "bne,a 2f\n\t" + " ldub [%0], %%g2\n\t" + ".subsection 2\n" + "2:\n\t" + "orcc %%g2, 0x0, %%g0\n\t" + "bne,a 2b\n\t" + " ldub [%0], %%g2\n\t" + "b,a 1b\n\t" + ".previous\n" + : /* no outputs */ + : "r" (lock) + : "g2", "memory", "cc"); +} + +static inline int __raw_spin_trylock(raw_spinlock_t *lock) +{ + unsigned int result; + __asm__ __volatile__("ldstub [%1], %0" + : "=r" (result) + : "r" (lock) + : "memory"); + return (result == 0); +} + +static inline void __raw_spin_unlock(raw_spinlock_t *lock) +{ + __asm__ __volatile__("stb %%g0, [%0]" : : "r" (lock) : "memory"); +} + +/* Read-write spinlocks, allowing multiple readers + * but only one writer. + * + * NOTE! it is quite common to have readers in interrupts + * but no interrupt writers. For those circumstances we + * can "mix" irq-safe locks - any writer needs to get a + * irq-safe write-lock, but readers can get non-irqsafe + * read-locks. + * + * XXX This might create some problems with my dual spinlock + * XXX scheme, deadlocks etc. -DaveM + * + * Sort of like atomic_t's on Sparc, but even more clever. + * + * ------------------------------------ + * | 24-bit counter | wlock | raw_rwlock_t + * ------------------------------------ + * 31 8 7 0 + * + * wlock signifies the one writer is in or somebody is updating + * counter. For a writer, if he successfully acquires the wlock, + * but counter is non-zero, he has to release the lock and wait, + * till both counter and wlock are zero. + * + * Unfortunately this scheme limits us to ~16,000,000 cpus. + */ +static inline void __read_lock(raw_rwlock_t *rw) +{ + register raw_rwlock_t *lp asm("g1"); + lp = rw; + __asm__ __volatile__( + "mov %%o7, %%g4\n\t" + "call ___rw_read_enter\n\t" + " ldstub [%%g1 + 3], %%g2\n" + : /* no outputs */ + : "r" (lp) + : "g2", "g4", "memory", "cc"); +} + +#define __raw_read_lock(lock) \ +do { unsigned long flags; \ + local_irq_save(flags); \ + __read_lock(lock); \ + local_irq_restore(flags); \ +} while(0) + +static inline void __read_unlock(raw_rwlock_t *rw) +{ + register raw_rwlock_t *lp asm("g1"); + lp = rw; + __asm__ __volatile__( + "mov %%o7, %%g4\n\t" + "call ___rw_read_exit\n\t" + " ldstub [%%g1 + 3], %%g2\n" + : /* no outputs */ + : "r" (lp) + : "g2", "g4", "memory", "cc"); +} + +#define __raw_read_unlock(lock) \ +do { unsigned long flags; \ + local_irq_save(flags); \ + __read_unlock(lock); \ + local_irq_restore(flags); \ +} while(0) + +static inline void __raw_write_lock(raw_rwlock_t *rw) +{ + register raw_rwlock_t *lp asm("g1"); + lp = rw; + __asm__ __volatile__( + "mov %%o7, %%g4\n\t" + "call ___rw_write_enter\n\t" + " ldstub [%%g1 + 3], %%g2\n" + : /* no outputs */ + : "r" (lp) + : "g2", "g4", "memory", "cc"); + *(volatile __u32 *)&lp->lock = ~0U; +} + +static inline int __raw_write_trylock(raw_rwlock_t *rw) +{ + unsigned int val; + + __asm__ __volatile__("ldstub [%1 + 3], %0" + : "=r" (val) + : "r" (&rw->lock) + : "memory"); + + if (val == 0) { + val = rw->lock & ~0xff; + if (val) + ((volatile u8*)&rw->lock)[3] = 0; + else + *(volatile u32*)&rw->lock = ~0U; + } + + return (val == 0); +} + +static inline int __read_trylock(raw_rwlock_t *rw) +{ + register raw_rwlock_t *lp asm("g1"); + register int res asm("o0"); + lp = rw; + __asm__ __volatile__( + "mov %%o7, %%g4\n\t" + "call ___rw_read_try\n\t" + " ldstub [%%g1 + 3], %%g2\n" + : "=r" (res) + : "r" (lp) + : "g2", "g4", "memory", "cc"); + return res; +} + +#define __raw_read_trylock(lock) \ +({ unsigned long flags; \ + int res; \ + local_irq_save(flags); \ + res = __read_trylock(lock); \ + local_irq_restore(flags); \ + res; \ +}) + +#define __raw_write_unlock(rw) do { (rw)->lock = 0; } while(0) + +#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock) + +#define _raw_spin_relax(lock) cpu_relax() +#define _raw_read_relax(lock) cpu_relax() +#define _raw_write_relax(lock) cpu_relax() + +#define __raw_read_can_lock(rw) (!((rw)->lock & 0xff)) +#define __raw_write_can_lock(rw) (!(rw)->lock) + +#endif /* !(__ASSEMBLY__) */ + +#endif /* __SPARC_SPINLOCK_H */ -- cgit v1.1