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intrinsics.h

#ifndef _ASM_IA64_INTRINSICS_H
#define _ASM_IA64_INTRINSICS_H

/*
 * Compiler-dependent intrinsics.
 *
 * Copyright (C) 2002-2003 Hewlett-Packard Co
 *    David Mosberger-Tang <davidm@hpl.hp.com>
 */

#ifndef __ASSEMBLY__

/* include compiler specific intrinsics */
#include <asm/ia64regs.h>
#ifdef __INTEL_COMPILER
# include <asm/intel_intrin.h>
#else
# include <asm/gcc_intrin.h>
#endif

#define ia64_native_get_psr_i()     (ia64_native_getreg(_IA64_REG_PSR) & IA64_PSR_I)

#define ia64_native_set_rr0_to_rr4(val0, val1, val2, val3, val4)  \
do {                                                  \
      ia64_native_set_rr(0x0000000000000000UL, (val0));           \
      ia64_native_set_rr(0x2000000000000000UL, (val1));           \
      ia64_native_set_rr(0x4000000000000000UL, (val2));           \
      ia64_native_set_rr(0x6000000000000000UL, (val3));           \
      ia64_native_set_rr(0x8000000000000000UL, (val4));           \
} while (0)

/*
 * Force an unresolved reference if someone tries to use
 * ia64_fetch_and_add() with a bad value.
 */
extern unsigned long __bad_size_for_ia64_fetch_and_add (void);
extern unsigned long __bad_increment_for_ia64_fetch_and_add (void);

#define IA64_FETCHADD(tmp,v,n,sz,sem)                                   \
({                                                          \
      switch (sz) {                                               \
            case 4:                                               \
              tmp = ia64_fetchadd4_##sem((unsigned int *) v, n);        \
            break;                                                \
                                                            \
            case 8:                                               \
              tmp = ia64_fetchadd8_##sem((unsigned long *) v, n);       \
            break;                                                \
                                                            \
            default:                                              \
            __bad_size_for_ia64_fetch_and_add();                        \
      }                                                     \
})

#define ia64_fetchadd(i,v,sem)                                                \
({                                                                \
      __u64 _tmp;                                                 \
      volatile __typeof__(*(v)) *_v = (v);                                    \
      /* Can't use a switch () here: gcc isn't always smart enough for that... */   \
      if ((i) == -16)                                                   \
            IA64_FETCHADD(_tmp, _v, -16, sizeof(*(v)), sem);                  \
      else if ((i) == -8)                                               \
            IA64_FETCHADD(_tmp, _v, -8, sizeof(*(v)), sem);                   \
      else if ((i) == -4)                                               \
            IA64_FETCHADD(_tmp, _v, -4, sizeof(*(v)), sem);                   \
      else if ((i) == -1)                                               \
            IA64_FETCHADD(_tmp, _v, -1, sizeof(*(v)), sem);                   \
      else if ((i) == 1)                                                \
            IA64_FETCHADD(_tmp, _v, 1, sizeof(*(v)), sem);                    \
      else if ((i) == 4)                                                \
            IA64_FETCHADD(_tmp, _v, 4, sizeof(*(v)), sem);                    \
      else if ((i) == 8)                                                \
            IA64_FETCHADD(_tmp, _v, 8, sizeof(*(v)), sem);                    \
      else if ((i) == 16)                                               \
            IA64_FETCHADD(_tmp, _v, 16, sizeof(*(v)), sem);                   \
      else                                                        \
            _tmp = __bad_increment_for_ia64_fetch_and_add();                  \
      (__typeof__(*(v))) (_tmp);    /* return old value */                    \
})

#define ia64_fetch_and_add(i,v)     (ia64_fetchadd(i, v, rel) + (i)) /* return new value */

/*
 * This function doesn't exist, so you'll get a linker error if
 * something tries to do an invalid xchg().
 */
extern void ia64_xchg_called_with_bad_pointer (void);

#define __xchg(x,ptr,size)                                  \
({                                                    \
      unsigned long __xchg_result;                          \
                                                      \
      switch (size) {                                       \
            case 1:                                         \
            __xchg_result = ia64_xchg1((__u8 *)ptr, x);           \
            break;                                          \
                                                      \
            case 2:                                         \
            __xchg_result = ia64_xchg2((__u16 *)ptr, x);          \
            break;                                          \
                                                      \
            case 4:                                         \
            __xchg_result = ia64_xchg4((__u32 *)ptr, x);          \
            break;                                          \
                                                      \
            case 8:                                         \
            __xchg_result = ia64_xchg8((__u64 *)ptr, x);          \
            break;                                          \
            default:                                        \
            ia64_xchg_called_with_bad_pointer();                  \
      }                                               \
      __xchg_result;                                        \
})

#define xchg(ptr,x)                                              \
  ((__typeof__(*(ptr))) __xchg ((unsigned long) (x), (ptr), sizeof(*(ptr))))

/*
 * 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

/*
 * This function doesn't exist, so you'll get a linker error
 * if something tries to do an invalid cmpxchg().
 */
extern long ia64_cmpxchg_called_with_bad_pointer (void);

#define ia64_cmpxchg(sem,ptr,old,new,size)                                    \
({                                                                \
      __u64 _o_, _r_;                                                   \
                                                                  \
      switch (size) {                                                   \
            case 1: _o_ = (__u8 ) (long) (old); break;                        \
            case 2: _o_ = (__u16) (long) (old); break;                        \
            case 4: _o_ = (__u32) (long) (old); break;                        \
            case 8: _o_ = (__u64) (long) (old); break;                        \
            default: break;                                             \
      }                                                           \
      switch (size) {                                                   \
            case 1:                                                     \
                  _r_ = ia64_cmpxchg1_##sem((__u8 *) ptr, new, _o_);                \
            break;                                                      \
                                                                  \
            case 2:                                                     \
             _r_ = ia64_cmpxchg2_##sem((__u16 *) ptr, new, _o_);              \
            break;                                                      \
                                                                  \
            case 4:                                                     \
                  _r_ = ia64_cmpxchg4_##sem((__u32 *) ptr, new, _o_);               \
            break;                                                      \
                                                                  \
            case 8:                                                     \
            _r_ = ia64_cmpxchg8_##sem((__u64 *) ptr, new, _o_);               \
            break;                                                      \
                                                                  \
            default:                                                    \
            _r_ = ia64_cmpxchg_called_with_bad_pointer();                     \
            break;                                                      \
      }                                                           \
      (__typeof__(old)) _r_;                                            \
})

#define cmpxchg_acq(ptr, o, n)      \
      ia64_cmpxchg(acq, (ptr), (o), (n), sizeof(*(ptr)))
#define cmpxchg_rel(ptr, o, n)      \
      ia64_cmpxchg(rel, (ptr), (o), (n), sizeof(*(ptr)))

/* for compatibility with other platforms: */
#define cmpxchg(ptr, o, n)    cmpxchg_acq((ptr), (o), (n))
#define cmpxchg64(ptr, o, n)  cmpxchg_acq((ptr), (o), (n))

#define cmpxchg_local         cmpxchg
#define cmpxchg64_local       cmpxchg64

#ifdef CONFIG_IA64_DEBUG_CMPXCHG
# define CMPXCHG_BUGCHECK_DECL      int _cmpxchg_bugcheck_count = 128;
# define CMPXCHG_BUGCHECK(v)                                      \
  do {                                                            \
      if (_cmpxchg_bugcheck_count-- <= 0) {                             \
            void *ip;                                       \
            extern int printk(const char *fmt, ...);              \
            ip = (void *) ia64_getreg(_IA64_REG_IP);              \
            printk("CMPXCHG_BUGCHECK: stuck at %p on word %p\n", ip, (v));    \
            break;                                                \
      }                                                     \
  } while (0)
#else /* !CONFIG_IA64_DEBUG_CMPXCHG */
# define CMPXCHG_BUGCHECK_DECL
# define CMPXCHG_BUGCHECK(v)
#endif /* !CONFIG_IA64_DEBUG_CMPXCHG */

#endif

#ifdef __KERNEL__
#include <asm/paravirt_privop.h>
#endif

#ifndef __ASSEMBLY__
#if defined(CONFIG_PARAVIRT) && defined(__KERNEL__)
#define IA64_INTRINSIC_API(name)    pv_cpu_ops.name
#define IA64_INTRINSIC_MACRO(name)  paravirt_ ## name
#else
#define IA64_INTRINSIC_API(name)    ia64_native_ ## name
#define IA64_INTRINSIC_MACRO(name)  ia64_native_ ## name
#endif

/************************************************/
/* Instructions paravirtualized for correctness */
/************************************************/
/* fc, thash, get_cpuid, get_pmd, get_eflags, set_eflags */
/* Note that "ttag" and "cover" are also privilege-sensitive; "ttag"
 * is not currently used (though it may be in a long-format VHPT system!)
 */
#define ia64_fc                     IA64_INTRINSIC_API(fc)
#define ia64_thash                  IA64_INTRINSIC_API(thash)
#define ia64_get_cpuid              IA64_INTRINSIC_API(get_cpuid)
#define ia64_get_pmd                IA64_INTRINSIC_API(get_pmd)


/************************************************/
/* Instructions paravirtualized for performance */
/************************************************/
#define ia64_ssm              IA64_INTRINSIC_MACRO(ssm)
#define ia64_rsm              IA64_INTRINSIC_MACRO(rsm)
#define ia64_getreg                 IA64_INTRINSIC_API(getreg)
#define ia64_setreg                 IA64_INTRINSIC_API(setreg)
#define ia64_set_rr                 IA64_INTRINSIC_API(set_rr)
#define ia64_get_rr                 IA64_INTRINSIC_API(get_rr)
#define ia64_ptcga                  IA64_INTRINSIC_API(ptcga)
#define ia64_get_psr_i              IA64_INTRINSIC_API(get_psr_i)
#define ia64_intrin_local_irq_restore     \
      IA64_INTRINSIC_API(intrin_local_irq_restore)
#define ia64_set_rr0_to_rr4         IA64_INTRINSIC_API(set_rr0_to_rr4)

#endif /* !__ASSEMBLY__ */

#endif /* _ASM_IA64_INTRINSICS_H */

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