xref: /openbmc/linux/fs/befs/endian.h (revision 0a907292)
1  /* SPDX-License-Identifier: GPL-2.0 */
2  /*
3   * linux/fs/befs/endian.h
4   *
5   * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com>
6   *
7   * Partially based on similar funtions in the sysv driver.
8   */
9  
10  #ifndef LINUX_BEFS_ENDIAN
11  #define LINUX_BEFS_ENDIAN
12  
13  #include <asm/byteorder.h>
14  
15  static inline u64
16  fs64_to_cpu(const struct super_block *sb, fs64 n)
17  {
18  	if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
19  		return le64_to_cpu((__force __le64)n);
20  	else
21  		return be64_to_cpu((__force __be64)n);
22  }
23  
24  static inline fs64
25  cpu_to_fs64(const struct super_block *sb, u64 n)
26  {
27  	if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
28  		return (__force fs64)cpu_to_le64(n);
29  	else
30  		return (__force fs64)cpu_to_be64(n);
31  }
32  
33  static inline u32
34  fs32_to_cpu(const struct super_block *sb, fs32 n)
35  {
36  	if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
37  		return le32_to_cpu((__force __le32)n);
38  	else
39  		return be32_to_cpu((__force __be32)n);
40  }
41  
42  static inline fs32
43  cpu_to_fs32(const struct super_block *sb, u32 n)
44  {
45  	if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
46  		return (__force fs32)cpu_to_le32(n);
47  	else
48  		return (__force fs32)cpu_to_be32(n);
49  }
50  
51  static inline u16
52  fs16_to_cpu(const struct super_block *sb, fs16 n)
53  {
54  	if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
55  		return le16_to_cpu((__force __le16)n);
56  	else
57  		return be16_to_cpu((__force __be16)n);
58  }
59  
60  static inline fs16
61  cpu_to_fs16(const struct super_block *sb, u16 n)
62  {
63  	if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
64  		return (__force fs16)cpu_to_le16(n);
65  	else
66  		return (__force fs16)cpu_to_be16(n);
67  }
68  
69  /* Composite types below here */
70  
71  static inline befs_block_run
72  fsrun_to_cpu(const struct super_block *sb, befs_disk_block_run n)
73  {
74  	befs_block_run run;
75  
76  	if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE) {
77  		run.allocation_group = le32_to_cpu((__force __le32)n.allocation_group);
78  		run.start = le16_to_cpu((__force __le16)n.start);
79  		run.len = le16_to_cpu((__force __le16)n.len);
80  	} else {
81  		run.allocation_group = be32_to_cpu((__force __be32)n.allocation_group);
82  		run.start = be16_to_cpu((__force __be16)n.start);
83  		run.len = be16_to_cpu((__force __be16)n.len);
84  	}
85  	return run;
86  }
87  
88  static inline befs_disk_block_run
89  cpu_to_fsrun(const struct super_block *sb, befs_block_run n)
90  {
91  	befs_disk_block_run run;
92  
93  	if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE) {
94  		run.allocation_group = cpu_to_le32(n.allocation_group);
95  		run.start = cpu_to_le16(n.start);
96  		run.len = cpu_to_le16(n.len);
97  	} else {
98  		run.allocation_group = cpu_to_be32(n.allocation_group);
99  		run.start = cpu_to_be16(n.start);
100  		run.len = cpu_to_be16(n.len);
101  	}
102  	return run;
103  }
104  
105  static inline befs_data_stream
106  fsds_to_cpu(const struct super_block *sb, const befs_disk_data_stream *n)
107  {
108  	befs_data_stream data;
109  	int i;
110  
111  	for (i = 0; i < BEFS_NUM_DIRECT_BLOCKS; ++i)
112  		data.direct[i] = fsrun_to_cpu(sb, n->direct[i]);
113  
114  	data.max_direct_range = fs64_to_cpu(sb, n->max_direct_range);
115  	data.indirect = fsrun_to_cpu(sb, n->indirect);
116  	data.max_indirect_range = fs64_to_cpu(sb, n->max_indirect_range);
117  	data.double_indirect = fsrun_to_cpu(sb, n->double_indirect);
118  	data.max_double_indirect_range = fs64_to_cpu(sb,
119  						     n->
120  						     max_double_indirect_range);
121  	data.size = fs64_to_cpu(sb, n->size);
122  
123  	return data;
124  }
125  
126  #endif				//LINUX_BEFS_ENDIAN
127