1 use crate::{
2 arch::interrupt::{cli, sti},
3 include::bindings::bindings::{io_in8, io_out8},
4 syscall::SystemError,
5 };
6
7 pub struct RtcTime {
8 pub second: i32,
9 pub minute: i32,
10 pub hour: i32,
11 pub day: i32,
12 pub month: i32,
13 pub year: i32,
14 }
15
16 impl Default for RtcTime {
default() -> Self17 fn default() -> Self {
18 Self {
19 second: (0),
20 minute: (0),
21 hour: (0),
22 day: (0),
23 month: (0),
24 year: (0),
25 }
26 }
27 }
28
29 impl RtcTime {
30 ///@brief 从主板cmos中获取时间
31 ///
32 ///@param self time结构体
33 ///@return int 成功则为0
get(&mut self) -> Result<i32, SystemError>34 pub fn get(&mut self) -> Result<i32, SystemError> {
35 // 为防止中断请求打断该过程，需要先关中断
36 cli();
37 //0x0B
38 let status_register_b: u8 = read_cmos(0x0B); // 读取状态寄存器B
39 let is_24h: bool = if (status_register_b & 0x02) != 0 {
40 true
41 } else {
42 false
43 }; // 判断是否启用24小时模式
44
45 let is_binary: bool = if (status_register_b & 0x04) != 0 {
46 true
47 } else {
48 false
49 }; // 判断是否为二进制码
50
51 loop {
52 self.year = read_cmos(CMOSTimeSelector::Year as u8) as i32;
53 self.month = read_cmos(CMOSTimeSelector::Month as u8) as i32;
54 self.day = read_cmos(CMOSTimeSelector::Day as u8) as i32;
55 self.hour = read_cmos(CMOSTimeSelector::Hour as u8) as i32;
56 self.minute = read_cmos(CMOSTimeSelector::Minute as u8) as i32;
57 self.second = read_cmos(CMOSTimeSelector::Second as u8) as i32;
58
59 if self.second == read_cmos(CMOSTimeSelector::Second as u8) as i32 {
60 break;
61 } // 若读取时间过程中时间发生跳变则重新读取
62 }
63
64 unsafe {
65 io_out8(0x70, 0x00);
66 }
67
68 if !is_binary
69 // 把BCD转为二进制
70 {
71 self.second = (self.second & 0xf) + (self.second >> 4) * 10;
72 self.minute = (self.minute & 0xf) + (self.minute >> 4) * 10;
73 self.hour = ((self.hour & 0xf) + ((self.hour & 0x70) >> 4) * 10) | (self.hour & 0x80);
74 self.day = (self.day & 0xf) + ((self.day / 16) * 10);
75 self.month = (self.month & 0xf) + (self.month >> 4) * 10;
76 self.year = (self.year & 0xf) + (self.year >> 4) * 10;
77 }
78 self.year += 2000;
79
80 if (!is_24h) && (self.hour & 0x80) != 0 {
81 self.hour = ((self.hour & 0x7f) + 12) % 24;
82 } // 将十二小时制转为24小时
83
84 sti();
85
86 return Ok(0);
87 }
88 }
89
90 ///置位0x70的第7位，禁止不可屏蔽中断
91 #[inline]
read_cmos(addr: u8) -> u892 fn read_cmos(addr: u8) -> u8 {
93 unsafe {
94 io_out8(0x70, 0x80 | addr);
95 return io_in8(0x71);
96 }
97 }
98
99 /// used in the form of u8
100 #[repr(u8)]
101 enum CMOSTimeSelector {
102 Second = 0x00,
103 Minute = 0x02,
104 Hour = 0x04,
105 Day = 0x07,
106 Month = 0x08,
107 Year = 0x09,
108 }
109