root/tools/testing/selftests/kvm/include/sparsebit.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * tools/testing/selftests/kvm/include/sparsebit.h
   4  *
   5  * Copyright (C) 2018, Google LLC.
   6  *
   7  * Header file that describes API to the sparsebit library.
   8  * This library provides a memory efficient means of storing
   9  * the settings of bits indexed via a uint64_t.  Memory usage
  10  * is reasonable, significantly less than (2^64 / 8) bytes, as
  11  * long as bits that are mostly set or mostly cleared are close
  12  * to each other.  This library is efficient in memory usage
  13  * even in the case where most bits are set.
  14  */
  15 
  16 #ifndef SELFTEST_KVM_SPARSEBIT_H
  17 #define SELFTEST_KVM_SPARSEBIT_H
  18 
  19 #include <stdbool.h>
  20 #include <stdint.h>
  21 #include <stdio.h>
  22 
  23 #ifdef __cplusplus
  24 extern "C" {
  25 #endif
  26 
  27 struct sparsebit;
  28 typedef uint64_t sparsebit_idx_t;
  29 typedef uint64_t sparsebit_num_t;
  30 
  31 struct sparsebit *sparsebit_alloc(void);
  32 void sparsebit_free(struct sparsebit **sbitp);
  33 void sparsebit_copy(struct sparsebit *dstp, struct sparsebit *src);
  34 
  35 bool sparsebit_is_set(struct sparsebit *sbit, sparsebit_idx_t idx);
  36 bool sparsebit_is_set_num(struct sparsebit *sbit,
  37                           sparsebit_idx_t idx, sparsebit_num_t num);
  38 bool sparsebit_is_clear(struct sparsebit *sbit, sparsebit_idx_t idx);
  39 bool sparsebit_is_clear_num(struct sparsebit *sbit,
  40                             sparsebit_idx_t idx, sparsebit_num_t num);
  41 sparsebit_num_t sparsebit_num_set(struct sparsebit *sbit);
  42 bool sparsebit_any_set(struct sparsebit *sbit);
  43 bool sparsebit_any_clear(struct sparsebit *sbit);
  44 bool sparsebit_all_set(struct sparsebit *sbit);
  45 bool sparsebit_all_clear(struct sparsebit *sbit);
  46 sparsebit_idx_t sparsebit_first_set(struct sparsebit *sbit);
  47 sparsebit_idx_t sparsebit_first_clear(struct sparsebit *sbit);
  48 sparsebit_idx_t sparsebit_next_set(struct sparsebit *sbit, sparsebit_idx_t prev);
  49 sparsebit_idx_t sparsebit_next_clear(struct sparsebit *sbit, sparsebit_idx_t prev);
  50 sparsebit_idx_t sparsebit_next_set_num(struct sparsebit *sbit,
  51                                        sparsebit_idx_t start, sparsebit_num_t num);
  52 sparsebit_idx_t sparsebit_next_clear_num(struct sparsebit *sbit,
  53                                          sparsebit_idx_t start, sparsebit_num_t num);
  54 
  55 void sparsebit_set(struct sparsebit *sbitp, sparsebit_idx_t idx);
  56 void sparsebit_set_num(struct sparsebit *sbitp, sparsebit_idx_t start,
  57                        sparsebit_num_t num);
  58 void sparsebit_set_all(struct sparsebit *sbitp);
  59 
  60 void sparsebit_clear(struct sparsebit *sbitp, sparsebit_idx_t idx);
  61 void sparsebit_clear_num(struct sparsebit *sbitp,
  62                          sparsebit_idx_t start, sparsebit_num_t num);
  63 void sparsebit_clear_all(struct sparsebit *sbitp);
  64 
  65 void sparsebit_dump(FILE *stream, struct sparsebit *sbit,
  66                     unsigned int indent);
  67 void sparsebit_validate_internal(struct sparsebit *sbit);
  68 
  69 #ifdef __cplusplus
  70 }
  71 #endif
  72 
  73 #endif /* SELFTEST_KVM_SPARSEBIT_H */