Initialize both PIC simultaneously.
(&mut self)
| 87 | |
| 88 | // Initialize both PIC simultaneously. |
| 89 | pub unsafe fn init(&mut self) |
| 90 | { |
| 91 | // Wait between writes to the PIC. |
| 92 | let mut waitport: Port<u8>= Port::new(0x80); |
| 93 | let mut wait = || waitport.write(0); |
| 94 | |
| 95 | // Save interrupt masks. |
| 96 | let mask_save = self.mask_read(); |
| 97 | |
| 98 | // Alert each PIC to an incoming initialization sequence. |
| 99 | self.pics[0].cmd.write(INIT_CMD); |
| 100 | wait(); |
| 101 | self.pics[1].cmd.write(INIT_CMD); |
| 102 | wait(); |
| 103 | |
| 104 | // Byte 1/3 - Establish base offsets. |
| 105 | self.pics[0].data.write(self.pics[0].offset); |
| 106 | wait(); |
| 107 | self.pics[1].data.write(self.pics[1].offset); |
| 108 | wait(); |
| 109 | |
| 110 | // Byte 2/3 - Coordinate the chain between the pair of PIC. |
| 111 | self.pics[0].data.write(4); |
| 112 | wait(); |
| 113 | self.pics[1].data.write(2); |
| 114 | wait(); |
| 115 | |
| 116 | // Byte 3/3 - Set the PIC mode. |
| 117 | self.pics[0].data.write(MODE_8086); |
| 118 | wait(); |
| 119 | self.pics[1].data.write(MODE_8086); |
| 120 | wait(); |
| 121 | |
| 122 | // Restore the previously saved masks. |
| 123 | self.mask_write(mask_save[0], mask_save[1]) |
| 124 | } |
| 125 | |
| 126 | // Read interrupt mask for both PIC, respectively. |
| 127 | pub unsafe fn mask_read(&mut self) -> [u8; 2] |
nothing calls this directly
no test coverage detected