diff options
| -rw-r--r-- | include/asm-mips/cmpxchg.h | 107 | ||||
| -rw-r--r-- | include/asm-mips/local.h | 1 | ||||
| -rw-r--r-- | include/asm-mips/system.h | 261 |
3 files changed, 109 insertions, 260 deletions
diff --git a/include/asm-mips/cmpxchg.h b/include/asm-mips/cmpxchg.h new file mode 100644 index 0000000..c5b4708 --- /dev/null +++ b/include/asm-mips/cmpxchg.h @@ -0,0 +1,107 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2003, 06, 07 by Ralf Baechle (ralf@linux-mips.org) + */ +#ifndef __ASM_CMPXCHG_H +#define __ASM_CMPXCHG_H + +#include <linux/irqflags.h> + +#define __HAVE_ARCH_CMPXCHG 1 + +#define __cmpxchg_asm(ld, st, m, old, new) \ +({ \ + __typeof(*(m)) __ret; \ + \ + if (cpu_has_llsc && R10000_LLSC_WAR) { \ + __asm__ __volatile__( \ + " .set push \n" \ + " .set noat \n" \ + " .set mips3 \n" \ + "1: " ld " %0, %2 # __cmpxchg_asm \n" \ + " bne %0, %z3, 2f \n" \ + " .set mips0 \n" \ + " move $1, %z4 \n" \ + " .set mips3 \n" \ + " " st " $1, %1 \n" \ + " beqzl $1, 1b \n" \ + "2: \n" \ + " .set pop \n" \ + : "=&r" (__ret), "=R" (*m) \ + : "R" (*m), "Jr" (old), "Jr" (new) \ + : "memory"); \ + } else if (cpu_has_llsc) { \ + __asm__ __volatile__( \ + " .set push \n" \ + " .set noat \n" \ + " .set mips3 \n" \ + "1: " ld " %0, %2 # __cmpxchg_asm \n" \ + " bne %0, %z3, 2f \n" \ + " .set mips0 \n" \ + " move $1, %z4 \n" \ + " .set mips3 \n" \ + " " st " $1, %1 \n" \ + " beqz $1, 3f \n" \ + "2: \n" \ + " .subsection 2 \n" \ + "3: b 1b \n" \ + " .previous \n" \ + " .set pop \n" \ + : "=&r" (__ret), "=R" (*m) \ + : "R" (*m), "Jr" (old), "Jr" (new) \ + : "memory"); \ + } else { \ + unsigned long __flags; \ + \ + raw_local_irq_save(__flags); \ + __ret = *m; \ + if (__ret == old) \ + *m = new; \ + raw_local_irq_restore(__flags); \ + } \ + \ + __ret; \ +}) + +/* + * This function doesn't exist, so you'll get a linker error + * if something tries to do an invalid cmpxchg(). + */ +extern void __cmpxchg_called_with_bad_pointer(void); + +#define __cmpxchg(ptr,old,new,barrier) \ +({ \ + __typeof__(ptr) __ptr = (ptr); \ + __typeof__(*(ptr)) __old = (old); \ + __typeof__(*(ptr)) __new = (new); \ + __typeof__(*(ptr)) __res = 0; \ + \ + barrier; \ + \ + switch (sizeof(*(__ptr))) { \ + case 4: \ + __res = __cmpxchg_asm("ll", "sc", __ptr, __old, __new); \ + break; \ + case 8: \ + if (sizeof(long) == 8) { \ + __res = __cmpxchg_asm("lld", "scd", __ptr, \ + __old, __new); \ + break; \ + } \ + default: \ + __cmpxchg_called_with_bad_pointer(); \ + break; \ + } \ + \ + barrier; \ + \ + __res; \ +}) + +#define cmpxchg(ptr, old, new) __cmpxchg(ptr, old, new, smp_llsc_mb()) +#define cmpxchg_local(ptr, old, new) __cmpxchg(ptr, old, new,) + +#endif /* __ASM_CMPXCHG_H */ diff --git a/include/asm-mips/local.h b/include/asm-mips/local.h index ed882c8..7034a01 100644 --- a/include/asm-mips/local.h +++ b/include/asm-mips/local.h @@ -4,6 +4,7 @@ #include <linux/percpu.h> #include <linux/bitops.h> #include <asm/atomic.h> +#include <asm/cmpxchg.h> #include <asm/war.h> typedef struct diff --git a/include/asm-mips/system.h b/include/asm-mips/system.h index 357251f..480b574 100644 --- a/include/asm-mips/system.h +++ b/include/asm-mips/system.h @@ -17,6 +17,7 @@ #include <asm/addrspace.h> #include <asm/barrier.h> +#include <asm/cmpxchg.h> #include <asm/cpu-features.h> #include <asm/dsp.h> #include <asm/war.h> @@ -194,266 +195,6 @@ static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int siz #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) -#define __HAVE_ARCH_CMPXCHG 1 - -static inline unsigned long __cmpxchg_u32(volatile int * m, unsigned long old, - unsigned long new) -{ - __u32 retval; - - if (cpu_has_llsc && R10000_LLSC_WAR) { - __asm__ __volatile__( - " .set push \n" - " .set noat \n" - " .set mips3 \n" - "1: ll %0, %2 # __cmpxchg_u32 \n" - " bne %0, %z3, 2f \n" - " .set mips0 \n" - " move $1, %z4 \n" - " .set mips3 \n" - " sc $1, %1 \n" - " beqzl $1, 1b \n" - "2: \n" - " .set pop \n" - : "=&r" (retval), "=R" (*m) - : "R" (*m), "Jr" (old), "Jr" (new) - : "memory"); - } else if (cpu_has_llsc) { - __asm__ __volatile__( - " .set push \n" - " .set noat \n" - " .set mips3 \n" - "1: ll %0, %2 # __cmpxchg_u32 \n" - " bne %0, %z3, 2f \n" - " .set mips0 \n" - " move $1, %z4 \n" - " .set mips3 \n" - " sc $1, %1 \n" - " beqz $1, 3f \n" - "2: \n" - " .subsection 2 \n" - "3: b 1b \n" - " .previous \n" - " .set pop \n" - : "=&r" (retval), "=R" (*m) - : "R" (*m), "Jr" (old), "Jr" (new) - : "memory"); - } else { - unsigned long flags; - - raw_local_irq_save(flags); - retval = *m; - if (retval == old) - *m = new; - raw_local_irq_restore(flags); /* implies memory barrier */ - } - - smp_llsc_mb(); - - return retval; -} - -static inline unsigned long __cmpxchg_u32_local(volatile int * m, - unsigned long old, unsigned long new) -{ - __u32 retval; - - if (cpu_has_llsc && R10000_LLSC_WAR) { - __asm__ __volatile__( - " .set push \n" - " .set noat \n" - " .set mips3 \n" - "1: ll %0, %2 # __cmpxchg_u32 \n" - " bne %0, %z3, 2f \n" - " .set mips0 \n" - " move $1, %z4 \n" - " .set mips3 \n" - " sc $1, %1 \n" - " beqzl $1, 1b \n" - "2: \n" - " .set pop \n" - : "=&r" (retval), "=R" (*m) - : "R" (*m), "Jr" (old), "Jr" (new) - : "memory"); - } else if (cpu_has_llsc) { - __asm__ __volatile__( - " .set push \n" - " .set noat \n" - " .set mips3 \n" - "1: ll %0, %2 # __cmpxchg_u32 \n" - " bne %0, %z3, 2f \n" - " .set mips0 \n" - " move $1, %z4 \n" - " .set mips3 \n" - " sc $1, %1 \n" - " beqz $1, 1b \n" - "2: \n" - " .set pop \n" - : "=&r" (retval), "=R" (*m) - : "R" (*m), "Jr" (old), "Jr" (new) - : "memory"); - } else { - unsigned long flags; - - local_irq_save(flags); - retval = *m; - if (retval == old) - *m = new; - local_irq_restore(flags); /* implies memory barrier */ - } - - return retval; -} - -#ifdef CONFIG_64BIT -static inline unsigned long __cmpxchg_u64(volatile int * m, unsigned long old, - unsigned long new) -{ - __u64 retval; - - if (cpu_has_llsc && R10000_LLSC_WAR) { - __asm__ __volatile__( - " .set push \n" - " .set noat \n" - " .set mips3 \n" - "1: lld %0, %2 # __cmpxchg_u64 \n" - " bne %0, %z3, 2f \n" - " move $1, %z4 \n" - " scd $1, %1 \n" - " beqzl $1, 1b \n" - "2: \n" - " .set pop \n" - : "=&r" (retval), "=R" (*m) - : "R" (*m), "Jr" (old), "Jr" (new) - : "memory"); - } else if (cpu_has_llsc) { - __asm__ __volatile__( - " .set push \n" - " .set noat \n" - " .set mips3 \n" - "1: lld %0, %2 # __cmpxchg_u64 \n" - " bne %0, %z3, 2f \n" - " move $1, %z4 \n" - " scd $1, %1 \n" - " beqz $1, 3f \n" - "2: \n" - " .subsection 2 \n" - "3: b 1b \n" - " .previous \n" - " .set pop \n" - : "=&r" (retval), "=R" (*m) - : "R" (*m), "Jr" (old), "Jr" (new) - : "memory"); - } else { - unsigned long flags; - - raw_local_irq_save(flags); - retval = *m; - if (retval == old) - *m = new; - raw_local_irq_restore(flags); /* implies memory barrier */ - } - - smp_llsc_mb(); - - return retval; -} - -static inline unsigned long __cmpxchg_u64_local(volatile int * m, - unsigned long old, unsigned long new) -{ - __u64 retval; - - if (cpu_has_llsc && R10000_LLSC_WAR) { - __asm__ __volatile__( - " .set push \n" - " .set noat \n" - " .set mips3 \n" - "1: lld %0, %2 # __cmpxchg_u64 \n" - " bne %0, %z3, 2f \n" - " move $1, %z4 \n" - " scd $1, %1 \n" - " beqzl $1, 1b \n" - "2: \n" - " .set pop \n" - : "=&r" (retval), "=R" (*m) - : "R" (*m), "Jr" (old), "Jr" (new) - : "memory"); - } else if (cpu_has_llsc) { - __asm__ __volatile__( - " .set push \n" - " .set noat \n" - " .set mips3 \n" - "1: lld %0, %2 # __cmpxchg_u64 \n" - " bne %0, %z3, 2f \n" - " move $1, %z4 \n" - " scd $1, %1 \n" - " beqz $1, 1b \n" - "2: \n" - " .set pop \n" - : "=&r" (retval), "=R" (*m) - : "R" (*m), "Jr" (old), "Jr" (new) - : "memory"); - } else { - unsigned long flags; - - local_irq_save(flags); - retval = *m; - if (retval == old) - *m = new; - local_irq_restore(flags); /* implies memory barrier */ - } - - return retval; -} - -#else -extern unsigned long __cmpxchg_u64_unsupported_on_32bit_kernels( - volatile int * m, unsigned long old, unsigned long new); -#define __cmpxchg_u64 __cmpxchg_u64_unsupported_on_32bit_kernels -extern unsigned long __cmpxchg_u64_local_unsupported_on_32bit_kernels( - volatile int * m, unsigned long old, unsigned long new); -#define __cmpxchg_u64_local __cmpxchg_u64_local_unsupported_on_32bit_kernels -#endif - -/* This function doesn't exist, so you'll get a linker error - if something tries to do an invalid cmpxchg(). */ -extern void __cmpxchg_called_with_bad_pointer(void); - -static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old, - unsigned long new, int size) -{ - switch (size) { - case 4: - return __cmpxchg_u32(ptr, old, new); - case 8: - return __cmpxchg_u64(ptr, old, new); - } - __cmpxchg_called_with_bad_pointer(); - return old; -} - -static inline unsigned long __cmpxchg_local(volatile void * ptr, - unsigned long old, unsigned long new, int size) -{ - switch (size) { - case 4: - return __cmpxchg_u32_local(ptr, old, new); - case 8: - return __cmpxchg_u64_local(ptr, old, new); - } - __cmpxchg_called_with_bad_pointer(); - return old; -} - -#define cmpxchg(ptr,old,new) \ - ((__typeof__(*(ptr)))__cmpxchg((ptr), \ - (unsigned long)(old), (unsigned long)(new),sizeof(*(ptr)))) - -#define cmpxchg_local(ptr,old,new) \ - ((__typeof__(*(ptr)))__cmpxchg_local((ptr), \ - (unsigned long)(old), (unsigned long)(new),sizeof(*(ptr)))) - extern void set_handler (unsigned long offset, void *addr, unsigned long len); extern void set_uncached_handler (unsigned long offset, void *addr, unsigned long len); |
