arch/ia64/include/asm/fpu.h

   1 #ifndef _ASM_IA64_FPU_H
   2 #define _ASM_IA64_FPU_H
   3
   4 /*
   5  * Copyright (C) 1998, 1999, 2002, 2003 Hewlett-Packard Co
   6  *      David Mosberger-Tang <davidm@hpl.hp.com>
   7  */
   8
   9 /* floating point status register: */
  10 #define FPSR_TRAP_VD    (1 << 0)        /* invalid op trap disabled */
  11 #define FPSR_TRAP_DD    (1 << 1)        /* denormal trap disabled */
  12 #define FPSR_TRAP_ZD    (1 << 2)        /* zero-divide trap disabled */
  13 #define FPSR_TRAP_OD    (1 << 3)        /* overflow trap disabled */
  14 #define FPSR_TRAP_UD    (1 << 4)        /* underflow trap disabled */
  15 #define FPSR_TRAP_ID    (1 << 5)        /* inexact trap disabled */
  16 #define FPSR_S0(x)      ((x) <<  6)
  17 #define FPSR_S1(x)      ((x) << 19)
  18 #define FPSR_S2(x)      (__IA64_UL(x) << 32)
  19 #define FPSR_S3(x)      (__IA64_UL(x) << 45)
  20
  21 /* floating-point status field controls: */
  22 #define FPSF_FTZ        (1 << 0)                /* flush-to-zero */
  23 #define FPSF_WRE        (1 << 1)                /* widest-range exponent */
  24 #define FPSF_PC(x)      (((x) & 0x3) << 2)      /* precision control */
  25 #define FPSF_RC(x)      (((x) & 0x3) << 4)      /* rounding control */
  26 #define FPSF_TD         (1 << 6)                /* trap disabled */
  27
  28 /* floating-point status field flags: */
  29 #define FPSF_V          (1 <<  7)               /* invalid operation flag */
  30 #define FPSF_D          (1 <<  8)               /* denormal/unnormal operand flag */
  31 #define FPSF_Z          (1 <<  9)               /* zero divide (IEEE) flag */
  32 #define FPSF_O          (1 << 10)               /* overflow (IEEE) flag */
  33 #define FPSF_U          (1 << 11)               /* underflow (IEEE) flag */
  34 #define FPSF_I          (1 << 12)               /* inexact (IEEE) flag) */
  35
  36 /* floating-point rounding control: */
  37 #define FPRC_NEAREST    0x0
  38 #define FPRC_NEGINF     0x1
  39 #define FPRC_POSINF     0x2
  40 #define FPRC_TRUNC      0x3
  41
  42 #define FPSF_DEFAULT    (FPSF_PC (0x3) | FPSF_RC (FPRC_NEAREST))
  43
  44 /* This default value is the same as HP-UX uses.  Don't change it
  45    without a very good reason.  */
  46 #define FPSR_DEFAULT    (FPSR_TRAP_VD | FPSR_TRAP_DD | FPSR_TRAP_ZD     \
  47                          | FPSR_TRAP_OD | FPSR_TRAP_UD | FPSR_TRAP_ID   \
  48                          | FPSR_S0 (FPSF_DEFAULT)                       \
  49                          | FPSR_S1 (FPSF_DEFAULT | FPSF_TD | FPSF_WRE)  \
  50                          | FPSR_S2 (FPSF_DEFAULT | FPSF_TD)             \
  51                          | FPSR_S3 (FPSF_DEFAULT | FPSF_TD))
  52
  53 # ifndef __ASSEMBLY__
  54
  55 struct ia64_fpreg {
  56         union {
  57                 unsigned long bits[2];
  58                 long double __dummy;    /* force 16-byte alignment */
  59         } u;
  60 };
  61
  62 # endif /* __ASSEMBLY__ */
  63
  64 #endif /* _ASM_IA64_FPU_H */