pudding-pac 0.1.3

Peripheral Access Crate
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

#![allow(dead_code)]
#![cfg(target_arch = "arm")]

use core::arch::asm;

// T_Bit  0x20
// F_Bit  0x40
// I_Bit  0x80

pub unsafe fn fiq_enable() {
    asm!(
        r#"
            mrs     r0, cpsr                    /* cpsr取得 */
            bic     r0, r0, #0x40               /* Fビットをクリア */
            msr     cpsr_c, r0                  /* cpsr設定 */
        "#
    );
}

pub unsafe fn fiq_disable() {
    asm!(
        r#"
            mrs     r0, cpsr                    /* cpsr取得 */
            orr     r0, r0, #0x40               /* Fビットを設定 */
            msr     cpsr_c, r0                  /* cpsr設定 */
        "#
    );
}

pub unsafe fn irq_enable() {
    asm!(
        r#"
            mrs     r0, cpsr                    /* cpsr取得 */
            bic     r0, r0, #0x80               /* Iビットをクリア */
            msr     cpsr_c, r0                  /* cpsr設定 */
        "#
    );
}

pub unsafe fn irq_disable() {
    asm!(
        r#"
            mrs     r0, cpsr                    /* cpsr取得 */
            orr     r0, r0, #0x80               /* Iビットを設定 */
            msr     cpsr_c, r0                  /* cpsr設定 */
        "#
    );
}

pub unsafe fn int_enable() {
    asm!(
        r#"
            mrs     r0, cpsr                    /* cpsr取得 */
            bic     r0, r0, #(0x40 | 0x80)      /* FビットとIビットをクリア */
            msr     cpsr_c, r0                  /* cpsr設定 */
        "#
    );
}

pub unsafe fn int_disable() {
    asm!(
        r#"
            mrs     r0, cpsr                    /* cpsr取得 */
            orr     r0, r0, #(0x40 | 0x80)      /* FビットとIビットを設定 */
            msr     cpsr_c, r0                  /* cpsr設定 */
        "#
    );
}

/// ソフトウェア割り込み
pub unsafe fn svc0() {
    asm!("svc 0");
}
pub unsafe fn svc1() {
    asm!("svc 1");
}
pub unsafe fn svc2() {
    asm!("svc 2");
}
pub unsafe fn svc3() {
    asm!("svc 3");
}
pub unsafe fn svc4() {
    asm!("svc 4");
}
pub unsafe fn svc5() {
    asm!("svc 5");
}
pub unsafe fn svc6() {
    asm!("svc 6");
}
pub unsafe fn svc7() {
    asm!("svc 7");
}

/// 割り込み待ち
pub unsafe fn wfi() -> ! {
    loop {
        asm!("wfi");
    }
}

///  分岐予測有効化
pub unsafe fn enable_bpredict() {
    asm!(
        r#"
            mrc     p15, 0, r0, c1, c0, 1       /* Read ACTLR */
            bic     r0, r0, #0x1 << 17          /* Clear RSDIS bit 17 to enable return stack */
            bic     r0, r0, #0x1 << 16          /* Clear BP bit 15 and BP bit 16 */
            bic     r0, r0, #0x1 << 15          /* Normal operation, BP is taken from the global history table */
            mcr     p15, 0, r0, c1, c0, 1       /* Write ACTLR */
            dsb
        "#
    );
}

/// 分岐予測無効化
pub unsafe fn disable_bpredict() {
    asm!(
        r#"
            mrc     p15, 0, r0, c1, c0, 1       /* Read ACTLR */
            orr     r0, r0, #0x1 << 17          /* Enable RSDIS bit 17 to disable the return stack */
            orr     r0, r0, #0x1 << 16          /* Clear BP bit 15 and set BP bit 16:*/
            bic     r0, r0, #0x1 << 15          /* Branch always not taken and history table updates disabled*/
            mcr     p15, 0, r0, c1, c0, 1       /* Write ACTLR */
            dsb
        "#
    );
}