hardware 0.0.9

A no_std bare-metal hardware abstraction layer — all port I/O, memory and swap allocations are guarded at runtime. Do not consider this dependency stable before x.1.x
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162

use super::consts::O_RDONLY;
use super::raw::raw_syscall;
use crate::arch::shim;

pub fn sys_open(path: &[u8], flags: i32, mode: u32) -> i64 {
    if path.is_empty() || path[path.len() - 1] != 0 {
        return crate::common::error::ERR_NOT_IMPLEMENTED;
    }
    unsafe {
        raw_syscall(
            shim::nr_openat(),
            shim::os_at_fdcwd() as u64,
            path.as_ptr() as u64,
            flags as u64,
            mode as u64,
            0,
            0,
        )
    }
}

pub fn sys_write_fd(fd: i64, buf: &[u8]) -> i64 {
    unsafe {
        raw_syscall(
            shim::nr_write(),
            fd as u64,
            buf.as_ptr() as u64,
            buf.len() as u64,
            0,
            0,
            0,
        )
    }
}

pub fn sys_read_fd(fd: i64, buf: &mut [u8]) -> i64 {
    unsafe {
        raw_syscall(
            shim::nr_read(),
            fd as u64,
            buf.as_mut_ptr() as u64,
            buf.len() as u64,
            0,
            0,
            0,
        )
    }
}

pub fn sys_close(fd: i64) -> i64 {
    unsafe { raw_syscall(shim::nr_close(), fd as u64, 0, 0, 0, 0, 0) }
}

pub fn sys_getdents64(fd: i64, buf: &mut [u8]) -> i64 {
    unsafe {
        raw_syscall(
            shim::nr_getdents64(),
            fd as u64,
            buf.as_mut_ptr() as u64,
            buf.len() as u64,
            0,
            0,
            0,
        )
    }
}

pub fn sys_fsync(fd: i64) -> i64 {
    unsafe { raw_syscall(shim::nr_fsync(), fd as u64, 0, 0, 0, 0, 0) }
}

pub fn sys_unlink(path: &[u8]) -> i64 {
    if path.is_empty() || path[path.len() - 1] != 0 {
        return crate::common::error::ERR_NOT_IMPLEMENTED;
    }
    unsafe {
        raw_syscall(
            shim::nr_unlinkat(),
            shim::os_at_fdcwd() as u64,
            path.as_ptr() as u64,
            0,
            0,
            0,
            0,
        )
    }
}

pub fn sys_mkdir(path: &[u8], mode: u32) -> i64 {
    if path.is_empty() || path[path.len() - 1] != 0 {
        return crate::common::error::ERR_NOT_IMPLEMENTED;
    }
    shim::mkdir(path, mode)
}

pub fn sys_stat(path: &[u8], statbuf: &mut [u8; 144]) -> i64 {
    if path.is_empty() || path[path.len() - 1] != 0 {
        return crate::common::error::ERR_NOT_IMPLEMENTED;
    }
    unsafe {
        raw_syscall(
            shim::nr_stat(),
            shim::os_at_fdcwd() as u64,
            path.as_ptr() as u64,
            statbuf.as_mut_ptr() as u64,
            0,
            0,
            0,
        )
    }
}

pub fn sys_getcwd(buf: &mut [u8]) -> i64 {
    unsafe {
        raw_syscall(
            shim::nr_getcwd(),
            buf.as_mut_ptr() as u64,
            buf.len() as u64,
            0,
            0,
            0,
            0,
        )
    }
}

pub fn sys_ioctl(fd: i64, request: u64, arg: u64) -> i64 {
    unsafe { raw_syscall(shim::nr_ioctl(), fd as u64, request, arg, 0, 0, 0) }
}

#[derive(Copy, Clone)]
pub struct DirEntry {
    pub name: [u8; 128],
    pub name_len: u8,
    pub d_type: u8,
}

pub fn scan_dir(dir_path: &[u8], out: &mut [DirEntry]) -> usize {
    shim::scan_dir_dispatch(dir_path, out)
}

pub fn read_file_bytes(path: &[u8], buf: &mut [u8]) -> usize {
    let fd = sys_open(path, O_RDONLY, 0);
    if fd < 0 {
        return 0;
    }
    let n = sys_read_fd(fd, buf);
    sys_close(fd);
    if n < 0 {
        0
    } else {
        n as usize
    }
}

pub fn trim_trailing(buf: &[u8], len: usize) -> usize {
    let mut l = len;
    while l > 0 && (buf[l - 1] == b'\n' || buf[l - 1] == b'\r' || buf[l - 1] == b' ') {
        l -= 1;
    }
    l
}