five32_instruction_set/
fields.rs

1use bitvec::field::BitField;
2use bitvec::order::Lsb0;
3use bitvec::slice::BitSlice;
4use bitvec::view::BitView;
5
6pub type Word = u32;
7
8#[derive(Debug, Default, Ord, PartialOrd, Eq, PartialEq)]
9pub struct ImmediateI(pub u32);
10
11#[derive(Debug, Default, Ord, PartialOrd, Eq, PartialEq)]
12pub struct ImmediateS(pub u32);
13
14#[derive(Debug, Default, Ord, PartialOrd, Eq, PartialEq)]
15pub struct ImmediateB(pub u32);
16
17#[derive(Debug, Default, Ord, PartialOrd, Eq, PartialEq)]
18pub struct ImmediateU(pub u32);
19
20#[derive(Debug, Default, Ord, PartialOrd, Eq, PartialEq)]
21pub struct ImmediateJ(pub u32);
22
23#[derive(Debug, Default, Ord, PartialOrd, Eq, PartialEq)]
24pub struct Rd(pub u8);
25
26#[derive(Debug, Default, Ord, PartialOrd, Eq, PartialEq)]
27pub struct Rs1(pub u8);
28
29#[derive(Debug, Default, Ord, PartialOrd, Eq, PartialEq)]
30pub struct Rs2(pub u8);
31
32#[derive(Debug, Default, Ord, PartialOrd, Eq, PartialEq)]
33pub struct Opcode(pub u8);
34
35#[derive(Debug, Default, Ord, PartialOrd, Eq, PartialEq)]
36pub struct Func3(pub u8);
37
38#[derive(Debug, Default, Ord, PartialOrd, Eq, PartialEq)]
39pub struct Func7(pub u8);
40
41impl From<&BitSlice<Word, Lsb0>> for Rd {
42    fn from(bs: &BitSlice<Word, Lsb0>) -> Self {
43        assert_eq!(bs.len(), 5);
44        Self(bs.load())
45    }
46}
47
48impl From<&BitSlice<Word, Lsb0>> for Func7 {
49    fn from(bs: &BitSlice<Word, Lsb0>) -> Self {
50        assert_eq!(bs.len(), 7);
51        Self(bs.load())
52    }
53}
54
55impl From<&BitSlice<Word, Lsb0>> for Func3 {
56    fn from(bs: &BitSlice<Word, Lsb0>) -> Self {
57        assert_eq!(bs.len(), 3);
58        Self(bs.load())
59    }
60}
61
62impl From<&BitSlice<Word, Lsb0>> for Opcode {
63    fn from(bs: &BitSlice<Word, Lsb0>) -> Self {
64        assert_eq!(bs.len(), 7);
65        Self(bs.load())
66    }
67}
68
69impl From<&BitSlice<Word, Lsb0>> for Rs1 {
70    fn from(bs: &BitSlice<Word, Lsb0>) -> Self {
71        assert_eq!(bs.len(), 5);
72        Self(bs.load())
73    }
74}
75
76impl From<&BitSlice<Word, Lsb0>> for Rs2 {
77    fn from(bs: &BitSlice<Word, Lsb0>) -> Self {
78        assert_eq!(bs.len(), 5);
79        Self(bs.load())
80    }
81}
82
83// impl From<&ImmediateI> for i32 {
84//     fn from(imm: &ImmediateI) -> Self {
85//
86//     }
87// }
88
89
90// Immediate    31      30        20 19             12    11 10         5 4          1       0
91//              |-------|-----------|---------------|-------|------------|-----------|-------|
92// Instr=K      | K[31] ->                 <- K[31] |  K[7] | K[30..25]  | K[11..8]  |  '0'  |
93//
94impl From<Word> for ImmediateB {
95
96    fn from(w: Word) -> Self {
97        let src = w.view_bits::<Lsb0>();
98        let mut data = 0u32;
99        let dst = data.view_bits_mut::<Lsb0>();
100
101        dst.set(11, src[7]);
102        dst[1..5].copy_from_bitslice(&src[8..=11]);
103        dst[5..11].copy_from_bitslice(&src[25..=30]);
104
105        for i in 12..=31 {
106            dst.set(i, src[31]);
107        }
108
109        Self(data)
110    }
111}
112
113// Immediate    31      30        20 19             12    11 10         5 4          1       0
114//              |-------|-----------|---------------|-------|------------|-----------|-------|
115// Instr=K      | K[31] ->                         <- K[31] | K[30..25]  | K[11..8]  | K[7]  |
116//
117impl From<Word> for ImmediateS {
118
119    fn from(w: Word) -> Self {
120        let src = w.view_bits::<Lsb0>();
121        let mut data = 0u32;
122        let dst = data.view_bits_mut::<Lsb0>();
123
124        dst.set(0, src[7]);
125        dst[1..=4].copy_from_bitslice(&src[8..=11]);
126        dst[5..=10].copy_from_bitslice(&src[25..=30]);
127
128        for i in 11..=31 {
129            dst.set(i, src[31]);
130        }
131
132        Self(data)
133    }
134}
135
136// Immediate    31      30        20 19             12    11 10         5 4          1       0
137//              |-------|-----------|---------------|-------|------------|-----------|-------|
138// Instr=K      | K[31] ->                         <- K[31] | K[30..25]  | K[24..21] | K[20] |
139//
140impl From<Word> for ImmediateI {
141
142    fn from(w: Word) -> Self {
143        let src = w.view_bits::<Lsb0>();
144        let mut data = 0u32;
145        let dst = data.view_bits_mut::<Lsb0>();
146
147        dst.set(0, src[20]);
148        dst[1..=4].copy_from_bitslice(&src[21..=24]);
149        dst[5..=10].copy_from_bitslice(&src[25..=30]);
150
151        for i in 11..=31 {
152            dst.set(i, src[31]);
153        }
154
155        Self(data)
156    }
157}
158
159// Immediate    31      30        20 19             12    11 10         5 4          1       0
160//              |-------|-----------|---------------|-------|------------|-----------|-------|
161// Instr=K      |          <- K[31] |   K[19..12]   | K[20] | K[30..25]  | K[24..21] |  '0'  |
162//
163impl From<Word> for ImmediateJ {
164
165    fn from(w: Word) -> Self {
166        let src = w.view_bits::<Lsb0>();
167        let mut data = 0u32;
168        let dst = data.view_bits_mut::<Lsb0>();
169
170        dst[1..5].copy_from_bitslice(&src[21..25]);
171        dst[5..11].copy_from_bitslice(&src[25..31]);
172        dst.set(11, src[20]);
173        dst[12..20].copy_from_bitslice(&src[12..20]);
174
175        for i in 20..32 {
176            dst.set(i, src[31]);
177        }
178
179        Self(data)
180    }
181}
182
183// Immediate    31      30        20 19             12    11 10         5 4          1       0
184//              |-------|-----------|---------------|-------|------------|-----------|-------|
185// Instr=K      |           K[31..12]               | '0' ->                          <- '0' |
186//
187impl From<Word> for ImmediateU {
188    fn from(w: Word) -> Self {
189        let src = w.view_bits::<Lsb0>();
190        let mut data = 0u32;
191        data.view_bits_mut::<Lsb0>()[12..=31].copy_from_bitslice(&src[12..=31]);
192        Self(data)
193    }
194}
five32_instruction_set/fields.rs

five32_instruction_set/
fields.rs
