bitops.h

   1 /*
   2  *      The PCI Utilities -- Decode bits and bit fields
   3  *
   4  *      Copyright (c) 2023 Martin Mares <mj@ucw.cz>
   5  *      Copyright (c) 2023 KNS Group LLC (YADRO)
   6  *
   7  *      Can be freely distributed and used under the terms of the GNU GPL v2+.
   8  *
   9  *      SPDX-License-Identifier: GPL-2.0-or-later
  10  */
  11
  12 #ifndef _BITOPS_H
  13 #define _BITOPS_H
  14
  15 #ifndef _PCI_LIB_H
  16 #error Import only from pci.h
  17 #endif
  18
  19 /* Useful macros for decoding of bits and bit fields */
  20
  21 #define FLAG(x, y) ((x & y) ? '+' : '-')
  22
  23 // Generate mask
  24
  25 #define BIT(at) ((u64)1 << (at))
  26 // Boundaries inclusive
  27 #define MASK(h, l)   ((((u64)1 << ((h) + 1)) - 1) & ~(((u64)1 << (l)) - 1))
  28
  29 // Get/set from register
  30
  31 #define BITS(x, at, width)      (((x) >> (at)) & ((1 << (width)) - 1))
  32 #define GET_REG_MASK(reg, mask) (((reg) & (mask)) / ((mask) & ~((mask) << 1)))
  33 #define SET_REG_MASK(reg, mask, val)                                                               \
  34   (((reg) & ~(mask)) | (((val) * ((mask) & ~((mask) << 1))) & (mask)))
  35
  36 #define TABLE(tab, x, buf)                                                                         \
  37   ((x) < sizeof(tab) / sizeof((tab)[0]) ? (tab)[x] : (sprintf((buf), "??%d", (x)), (buf)))
  38
  39 #endif