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sys/x86/include/xen/xen-os.h
| Show All 24 Lines | |||||
| * DEALINGS IN THE SOFTWARE. | * DEALINGS IN THE SOFTWARE. | ||||
| * | * | ||||
| * $FreeBSD$ | * $FreeBSD$ | ||||
| */ | */ | ||||
| #ifndef _MACHINE_X86_XEN_XEN_OS_H_ | #ifndef _MACHINE_X86_XEN_XEN_OS_H_ | ||||
| #define _MACHINE_X86_XEN_XEN_OS_H_ | #define _MACHINE_X86_XEN_XEN_OS_H_ | ||||
| #ifdef PAE | |||||
| #define CONFIG_X86_PAE | |||||
| #endif | |||||
| /* Everything below this point is not included by assembler (.S) files. */ | /* Everything below this point is not included by assembler (.S) files. */ | ||||
| #ifndef __ASSEMBLY__ | #ifndef __ASSEMBLY__ | ||||
| /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */ | |||||
| static inline void rep_nop(void) | |||||
| { | |||||
| __asm__ __volatile__ ( "rep;nop" : : : "memory" ); | |||||
| } | |||||
| #define cpu_relax() rep_nop() | |||||
| /* This is a barrier for the compiler only, NOT the processor! */ | |||||
| #define barrier() __asm__ __volatile__("": : :"memory") | |||||
| #define LOCK_PREFIX "" | |||||
| #define LOCK "" | |||||
| #define ADDR (*(volatile long *) addr) | |||||
| /** | |||||
| * test_and_clear_bit - Clear a bit and return its old value | |||||
| * @nr: Bit to set | |||||
| * @addr: Address to count from | |||||
| * | |||||
| * This operation is atomic and cannot be reordered. | |||||
| * It also implies a memory barrier. | |||||
| */ | |||||
| static __inline int test_and_clear_bit(int nr, volatile void * addr) | |||||
| { | |||||
| int oldbit; | |||||
| __asm__ __volatile__( LOCK_PREFIX | |||||
| "btrl %2,%1\n\tsbbl %0,%0" | |||||
| :"=r" (oldbit),"=m" (ADDR) | |||||
| :"Ir" (nr) : "memory"); | |||||
| return oldbit; | |||||
| } | |||||
| static __inline int constant_test_bit(int nr, const volatile void * addr) | |||||
| { | |||||
| return ((1UL << (nr & 31)) & (((const volatile unsigned int *) addr)[nr >> 5])) != 0; | |||||
| } | |||||
| static __inline int variable_test_bit(int nr, volatile void * addr) | |||||
| { | |||||
| int oldbit; | |||||
| __asm__ __volatile__( | |||||
| "btl %2,%1\n\tsbbl %0,%0" | |||||
| :"=r" (oldbit) | |||||
| :"m" (ADDR),"Ir" (nr)); | |||||
| return oldbit; | |||||
| } | |||||
| #define test_bit(nr,addr) \ | |||||
| (__builtin_constant_p(nr) ? \ | |||||
| constant_test_bit((nr),(addr)) : \ | |||||
| variable_test_bit((nr),(addr))) | |||||
| /** | |||||
| * set_bit - Atomically set a bit in memory | |||||
| * @nr: the bit to set | |||||
| * @addr: the address to start counting from | |||||
| * | |||||
| * This function is atomic and may not be reordered. See __set_bit() | |||||
| * if you do not require the atomic guarantees. | |||||
| * Note that @nr may be almost arbitrarily large; this function is not | |||||
| * restricted to acting on a single-word quantity. | |||||
| */ | |||||
| static __inline__ void set_bit(int nr, volatile void * addr) | |||||
| { | |||||
| __asm__ __volatile__( LOCK_PREFIX | |||||
| "btsl %1,%0" | |||||
| :"=m" (ADDR) | |||||
| :"Ir" (nr)); | |||||
| } | |||||
| /** | |||||
| * clear_bit - Clears a bit in memory | |||||
| * @nr: Bit to clear | |||||
| * @addr: Address to start counting from | |||||
| * | |||||
| * clear_bit() is atomic and may not be reordered. However, it does | |||||
| * not contain a memory barrier, so if it is used for locking purposes, | |||||
| * you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit() | |||||
| * in order to ensure changes are visible on other processors. | |||||
| */ | |||||
| static __inline__ void clear_bit(int nr, volatile void * addr) | |||||
| { | |||||
| __asm__ __volatile__( LOCK_PREFIX | |||||
| "btrl %1,%0" | |||||
| :"=m" (ADDR) | |||||
| :"Ir" (nr)); | |||||
| } | |||||
| #endif /* !__ASSEMBLY__ */ | #endif /* !__ASSEMBLY__ */ | ||||
| #endif /* _MACHINE_X86_XEN_XEN_OS_H_ */ | #endif /* _MACHINE_X86_XEN_XEN_OS_H_ */ | ||||