/* * Portions Copyright 2008 VMware, Inc. */ #ifndef __ASM_SYSTEM_H #define __ASM_SYSTEM_H #include #include #include #if defined(__VMKLNX__) #include "vmkapi.h" #endif #ifdef __KERNEL__ #define __STR(x) #x #define STR(x) __STR(x) #define __SAVE(reg,offset) "movq %%" #reg ",(14-" #offset ")*8(%%rsp)\n\t" #define __RESTORE(reg,offset) "movq (14-" #offset ")*8(%%rsp),%%" #reg "\n\t" /* frame pointer must be last for get_wchan */ #define SAVE_CONTEXT "pushq %%rbp ; movq %%rsi,%%rbp\n\t" #define RESTORE_CONTEXT "movq %%rbp,%%rsi ; popq %%rbp\n\t" #define __EXTRA_CLOBBER \ ,"rcx","rbx","rdx","r8","r9","r10","r11","r12","r13","r14","r15" #define switch_to(prev,next,last) \ asm volatile(SAVE_CONTEXT \ "movq %%rsp,%P[threadrsp](%[prev])\n\t" /* save RSP */ \ "movq %P[threadrsp](%[next]),%%rsp\n\t" /* restore RSP */ \ "call __switch_to\n\t" \ ".globl thread_return\n" \ "thread_return:\n\t" \ "movq %%gs:%P[pda_pcurrent],%%rsi\n\t" \ "movq %P[thread_info](%%rsi),%%r8\n\t" \ LOCK_PREFIX "btr %[tif_fork],%P[ti_flags](%%r8)\n\t" \ "movq %%rax,%%rdi\n\t" \ "jc ret_from_fork\n\t" \ RESTORE_CONTEXT \ : "=a" (last) \ : [next] "S" (next), [prev] "D" (prev), \ [threadrsp] "i" (offsetof(struct task_struct, thread.rsp)), \ [ti_flags] "i" (offsetof(struct thread_info, flags)),\ [tif_fork] "i" (TIF_FORK), \ [thread_info] "i" (offsetof(struct task_struct, thread_info)), \ [pda_pcurrent] "i" (offsetof(struct x8664_pda, pcurrent)) \ : "memory", "cc" __EXTRA_CLOBBER) extern void load_gs_index(unsigned); /* * Load a segment. Fall back on loading the zero * segment if something goes wrong.. */ #define loadsegment(seg,value) \ asm volatile("\n" \ "1:\t" \ "movl %k0,%%" #seg "\n" \ "2:\n" \ ".section .fixup,\"ax\"\n" \ "3:\t" \ "movl %1,%%" #seg "\n\t" \ "jmp 2b\n" \ ".previous\n" \ ".section __ex_table,\"a\"\n\t" \ ".align 8\n\t" \ ".quad 1b,3b\n" \ ".previous" \ : :"r" (value), "r" (0)) /* * Clear and set 'TS' bit respectively */ #define clts() __asm__ __volatile__ ("clts") static inline unsigned long read_cr0(void) { unsigned long cr0; asm volatile("movq %%cr0,%0" : "=r" (cr0)); return cr0; } static inline void write_cr0(unsigned long val) { asm volatile("movq %0,%%cr0" :: "r" (val)); } static inline unsigned long read_cr3(void) { unsigned long cr3; asm("movq %%cr3,%0" : "=r" (cr3)); return cr3; } static inline unsigned long read_cr4(void) { unsigned long cr4; asm("movq %%cr4,%0" : "=r" (cr4)); return cr4; } static inline void write_cr4(unsigned long val) { asm volatile("movq %0,%%cr4" :: "r" (val)); } #define stts() write_cr0(8 | read_cr0()) #define wbinvd() \ __asm__ __volatile__ ("wbinvd": : :"memory"); /* * On SMP systems, when the scheduler does migration-cost autodetection, * it needs a way to flush as much of the CPU's caches as possible. */ static inline void sched_cacheflush(void) { wbinvd(); } #endif /* __KERNEL__ */ #define nop() __asm__ __volatile__ ("nop") /** * xchg - exchange data between v and the value in memory pointed by ptr in an atomic operation * @ptr: a pointer to a memory to be exchanged * @v: a value to be exchanged * * Exchange v and the value in memory pointed by ptr in an atomic operation. * * SYNOPSIS: * #define xchg(ptr,v) * * RETURN VALUE: * It returns the original value of (*ptr). */ /* _VMKLNX_CODECHECK_: xchg */ #define xchg(ptr,v) ((__typeof__(*(ptr)))__xchg((unsigned long)(v),(ptr),sizeof(*(ptr)))) #define tas(ptr) (xchg((ptr),1)) #define __xg(x) ((volatile long *)(x)) static inline void set_64bit(volatile unsigned long *ptr, unsigned long val) { *ptr = val; } #define _set_64bit set_64bit /* * Note: no "lock" prefix even on SMP: xchg always implies lock anyway * Note 2: xchg has side effect, so that attribute volatile is necessary, * but generally the primitive is invalid, *ptr is output argument. --ANK */ /** * __xchg - exchange data between x and the value in memory pointed by ptr in an atomic operation * @x: a value to be exchanged * @ptr: a pointer to a memory to be exchanged * @size: the size of the value to be exchanged, in bytes - must be 1, 2, 4, or 8. * * Exchange x and the value in memory pointed by ptr in an atomic operation. * * RETURN VALUE: * The original value of (*ptr). * */ /* _VMKLNX_CODECHECK_: __xchg */ static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size) { switch (size) { case 1: __asm__ __volatile__("xchgb %b0,%1" :"=q" (x) :"m" (*__xg(ptr)), "0" (x) :"memory"); break; case 2: __asm__ __volatile__("xchgw %w0,%1" :"=r" (x) :"m" (*__xg(ptr)), "0" (x) :"memory"); break; case 4: __asm__ __volatile__("xchgl %k0,%1" :"=r" (x) :"m" (*__xg(ptr)), "0" (x) :"memory"); break; case 8: __asm__ __volatile__("xchgq %0,%1" :"=r" (x) :"m" (*__xg(ptr)), "0" (x) :"memory"); break; } return x; } /* * Atomic compare and exchange. Compare OLD with MEM, if identical, * store NEW in MEM. Return the initial value in MEM. Success is * indicated by comparing RETURN with OLD. */ #define __HAVE_ARCH_CMPXCHG 1 static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size) { unsigned long prev; switch (size) { case 1: #if defined(__VMKLNX__) vmk_AtomicPrologue(); #endif /* defined(__VMKLNX__) */ __asm__ __volatile__(LOCK_PREFIX "cmpxchgb %b1,%2" : "=a"(prev) : "q"(new), "m"(*__xg(ptr)), "0"(old) : "memory"); #if defined(__VMKLNX__) vmk_AtomicEpilogue(); #endif /* defined(__VMKLNX__) */ return prev; case 2: #if defined(__VMKLNX__) vmk_AtomicPrologue(); #endif /* defined(__VMKLNX__) */ __asm__ __volatile__(LOCK_PREFIX "cmpxchgw %w1,%2" : "=a"(prev) : "r"(new), "m"(*__xg(ptr)), "0"(old) : "memory"); #if defined(__VMKLNX__) vmk_AtomicEpilogue(); #endif /* defined(__VMKLNX__) */ return prev; case 4: #if defined(__VMKLNX__) vmk_AtomicPrologue(); #endif /* defined(__VMKLNX__) */ __asm__ __volatile__(LOCK_PREFIX "cmpxchgl %k1,%2" : "=a"(prev) : "r"(new), "m"(*__xg(ptr)), "0"(old) : "memory"); #if defined(__VMKLNX__) vmk_AtomicEpilogue(); #endif /* defined(__VMKLNX__) */ return prev; case 8: #if defined(__VMKLNX__) vmk_AtomicPrologue(); #endif /* defined(__VMKLNX__) */ __asm__ __volatile__(LOCK_PREFIX "cmpxchgq %1,%2" : "=a"(prev) : "r"(new), "m"(*__xg(ptr)), "0"(old) : "memory"); #if defined(__VMKLNX__) vmk_AtomicEpilogue(); #endif /* defined(__VMKLNX__) */ return prev; } return old; } #define cmpxchg(ptr,o,n)\ ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\ (unsigned long)(n),sizeof(*(ptr)))) #ifdef CONFIG_SMP /** * smp_mb - memory barrier for SMP * * Invokes memory barrier for SMP. * * SYNOPSIS: * #define smp_mb(void) * * RETURN VALUE: * None */ /* _VMKLNX_CODECHECK_: smp_mb */ #define smp_mb() mb() /** * smp_rmb - read memory barrier for SMP * * Invokes read memory barrier for SMP. * * SYNOPSIS: * #define smp_rmb(void) * * RETURN VALUE: * None */ /* _VMKLNX_CODECHECK_: smp_rmb */ #define smp_rmb() rmb() /** * smp_wmb - write memory barrier for SMP * * Invokes write memory barrier for SMP. * * SYNOPSIS: * #define smp_wmb(void) * * RETURN VALUE: * None */ /* _VMKLNX_CODECHECK_: smp_wmb */ #define smp_wmb() wmb() #define smp_read_barrier_depends() do {} while(0) #else #define smp_mb() barrier() #define smp_rmb() barrier() #define smp_wmb() barrier() #define smp_read_barrier_depends() do {} while(0) #endif /* * Force strict CPU ordering. * And yes, this is required on UP too when we're talking * to devices. */ #define mb() asm volatile("mfence":::"memory") /** * rmb - read memory barrier * * Read Memory Barriers make a guarantee that all the memory reads specified * before the barrier will happen before all memory reads specified after the * barrier. * * SYNOPSIS: * #define rmb(void) * * RETURN VALUE: * This function does not return a value. * */ /* _VMKLNX_CODECHECK_: rmb */ #define rmb() asm volatile("lfence":::"memory") /** * wmb - write memory barrier * * A write memory barrier guarantees that all write operations specified * before the barrier will happen before all the write operations specified * after the barrier. * * SYNOPSIS: * #define wmb() * * RETURN VALUE: * NONE */ /* * VMware : 2013 * * As mentioned in PR 891237, CONFIG_UNORDERED_IO was removed from Linux * on 03/25/2006 by Andi Kleen ("x86_64: Remove CONFIG_UNORDERED_IO"). Here * wmb() is being changed to a real sfence instead of just a compile barrier. */ /* _VMKLNX_CODECHECK_: wmb */ #define wmb() asm volatile("sfence" ::: "memory") #define read_barrier_depends() do {} while(0) #define set_mb(var, value) do { (void) xchg(&var, value); } while (0) /** * warn_if_not_ulong - warn if the type is not unsigned long * @x: variable to be tested * * Trigger a compiler warning if the type of a given argument is not unsigned long * * SYNOPSIS: * #define warn_if_not_ulong(x) * * RETURN VALUE: * NONE */ /* _VMKLNX_CODECHECK_: warn_if_not_ulong */ #define warn_if_not_ulong(x) do { unsigned long foo; (void) (&(x) == &foo); } while (0) #include void cpu_idle_wait(void); extern unsigned long arch_align_stack(unsigned long sp); extern void free_init_pages(char *what, unsigned long begin, unsigned long end); #endif