1 /* 2 * The PCI Utilities -- Decode bits and bit fields 3 * 4 * Copyright (c) 2023 Martin Mares <[email protected]> 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 40