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ll_math.h
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1 /*************************************************************************************************/
2 /*!
3  * \file
4  *
5  * \brief Link Layer math utilities.
6  *
7  * Copyright (c) 2013-2019 Arm Ltd. All Rights Reserved.
8  *
9  * Copyright (c) 2019 Packetcraft, Inc.
10  *
11  * Licensed under the Apache License, Version 2.0 (the "License");
12  * you may not use this file except in compliance with the License.
13  * You may obtain a copy of the License at
14  *
15  * http://www.apache.org/licenses/LICENSE-2.0
16  *
17  * Unless required by applicable law or agreed to in writing, software
18  * distributed under the License is distributed on an "AS IS" BASIS,
19  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
20  * See the License for the specific language governing permissions and
21  * limitations under the License.
22  */
23 /*************************************************************************************************/
24 #ifndef LL_MATH_H
25 #define LL_MATH_H
26 
27 #ifdef __cplusplus
28 extern "C" {
29 #endif
30 
31 #include "wsf_types.h"
32 
33 /**************************************************************************************************
34  Macros
35 **************************************************************************************************/
36 
37 /*! \brief Binary divide with 1,000 divisor (n[max]=7,999). */
38 #define LL_MATH_DIV_10E3(n) ((uint32_t)(((uint64_t)(n) * UINT64_C(536871)) >> 29))
39 
40 /*! \brief Binary divide with 1,000,000 divisor (n[max]=0xFFFFFFFF). */
41 #define LL_MATH_DIV_10E6(n) ((uint32_t)(((uint64_t)(n) * UINT64_C(4295)) >> 32))
42 
43 /*! \brief Binary divide with 10 divisor (n[max]=0xFFFFFFFF). */
44 #define LL_MATH_DIV_10(n) ((uint32_t)(((uint64_t)(n) * UINT64_C(419431)) >> 22))
45 
46 /*! \brief Binary divide with 27 divisor (n[max]=55,295). */
47 #define LL_MATH_DIV_27(n) (((n) * UINT32_C(77673)) >> 21)
48 
49 /*! \brief Binary divide with 37 divisor (n[max]=75,776). */
50 #define LL_MATH_DIV_37(n) (((n) * UINT32_C(56680)) >> 21)
51 
52 /*! \brief Binary modulo 37. */
53 #define LL_MATH_MOD_37(n) ((n) - (LL_MATH_DIV_37(n) * 37))
54 
55 /*! \brief Binary divide with 1250 divisor (n[max]=0xFFFFFFFF). */
56 #define LL_MATH_DIV_1250(n) ((uint32_t)(((uint64_t)(n) * UINT64_C(1717987)) >> 31))
57 
58 /*! \brief Binary divide with 625 divisor (n[max]=0xFFFFFFFF). */
59 #define LL_MATH_DIV_625(n) ((uint32_t)(((uint64_t)(n) * UINT64_C(1717987)) >> 30))
60 
61 /*! \brief Binary divide with 30 divisor (n[max]=0xFFFFFFFF). */
62 #define LL_MATH_DIV_30(n) ((uint32_t)(((uint64_t)(n) * UINT64_C(286331154)) >> 33))
63 
64 /*! \brief Binary divide with 300 divisor (n[max]=0x3FFFFFFF). */
65 #define LL_MATH_DIV_300(n) ((uint32_t)(((uint64_t)(n) * UINT64_C(14660155038)) >> 42))
66 
67 /**************************************************************************************************
68  Data Types
69 **************************************************************************************************/
70 
71 /*! \brief ECC service callback. */
72 typedef void (*LlMathEccServiceCback_t)(uint8_t op);
73 
74 /*! \brief ECC operations. */
75 enum
76 {
77  LL_MATH_ECC_OP_GENERATE_P256_KEY_PAIR, /*!< Generate P-256 key pair. */
78  LL_MATH_ECC_OP_GENERATE_DH_KEY /*!< Generate Diffie-Hellman key. */
79 };
80 
81 /**************************************************************************************************
82  Function Declarations
83 **************************************************************************************************/
84 
85 /*************************************************************************************************/
86 /*!
87  * \brief Generate random number.
88  *
89  * \return 32-bit random number.
90  */
91 /*************************************************************************************************/
92 uint32_t LlMathRandNum(void);
93 
94 /*************************************************************************************************/
95 /*!
96  * \brief Return the number of bits which are set.
97  *
98  * \param num Input parameter.
99  *
100  * \return Number of bits which are set.
101  */
102 /*************************************************************************************************/
103 uint8_t LlMathGetNumBitsSet(uint64_t num);
104 
105 /*************************************************************************************************/
106 /*!
107  * \brief Return result of a division.
108  *
109  * \param nu32 Numerator of size 32 bits.
110  * \param de32 Denominator of size 32 bits.
111  *
112  * \return Result of a division.
113  */
114 /*************************************************************************************************/
115 uint32_t LlMathDivideUint32(uint32_t nu32, uint32_t de32);
116 
117 /*************************************************************************************************/
118 /*!
119  * \brief Return result of a division, rounding up.
120  *
121  * \param nu32 Numerator of size 32 bits.
122  * \param de32 Denominator of size 32 bits.
123  *
124  * \return Result of a division.
125  */
126 /*************************************************************************************************/
127 uint32_t LlMathDivideUint32RoundUp(uint32_t nu32, uint32_t de32);
128 
129 #ifdef __cplusplus
130 };
131 #endif
132 
133 #endif /* LL_API_H */
LlMathRandNum
uint32_t LlMathRandNum(void)
Generate random number.
LL_MATH_ECC_OP_GENERATE_DH_KEY
Definition: ll_math.h:78
LlMathGetNumBitsSet
uint8_t LlMathGetNumBitsSet(uint64_t num)
Return the number of bits which are set.
LlMathEccServiceCback_t
void(* LlMathEccServiceCback_t)(uint8_t op)
ECC service callback.
Definition: ll_math.h:72
wsf_types.h
Platform-independent data types.
LL_MATH_ECC_OP_GENERATE_P256_KEY_PAIR
Definition: ll_math.h:77
LlMathDivideUint32RoundUp
uint32_t LlMathDivideUint32RoundUp(uint32_t nu32, uint32_t de32)
Return result of a division, rounding up.
LlMathDivideUint32
uint32_t LlMathDivideUint32(uint32_t nu32, uint32_t de32)
Return result of a division.
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