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Add ns16550a

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This commit is contained in:
Yifan Wu 2022-02-18 13:09:03 -08:00
parent fef12c79f1
commit 704eae3bb0
16 changed files with 311 additions and 129 deletions
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30
os/src/boards/qemu.rs
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@ -1,42 +1,54 @@
pub const CLOCK_FREQ: usize = 12500000;
pub const MMIO: &[(usize, usize)] = &[
(0x10001000, 0x1000),
(0x1000_0000, 0x1000),
(0x1000_1000, 0x1000),
(0xC00_0000, 0x40_0000),
];
pub type BlockDeviceImpl = crate::drivers::block::VirtIOBlock;
pub type CharDeviceImpl = crate::drivers::chardev::NS16550a<VIRT_UART>;
pub const VIRT_PLIC: usize = 0xC00_0000;
pub const VIRT_UART: usize = 0x1000_0000;
use crate::drivers::plic::{PLIC, IntrTargetPriority};
use crate::drivers::block::BLOCK_DEVICE;
use crate::drivers::chardev::{CharDevice, UART};
use crate::drivers::plic::{IntrTargetPriority, PLIC};
pub fn device_init() {
use riscv::register::sie;
let mut plic = unsafe { PLIC::new(VIRT_PLIC) };
let hart_id: usize = 0;
let supervisor = IntrTargetPriority::Supervisor;
let machine = IntrTargetPriority::Machine;
let machine = IntrTargetPriority::Machine;
plic.set_threshold(hart_id, supervisor, 0);
plic.set_threshold(hart_id, machine, 1);
for intr_src_id in [1usize, 10] {
plic.enable(hart_id, supervisor, intr_src_id);
plic.enable(hart_id, supervisor, intr_src_id);
plic.set_priority(intr_src_id, 1);
}
crate::println!("Hart0M threshold = {}", plic.get_threshold(hart_id, IntrTargetPriority::Machine));
crate::println!("Hart0S threshold = {}", plic.get_threshold(hart_id, IntrTargetPriority::Supervisor));
crate::println!(
"Hart0M threshold = {}",
plic.get_threshold(hart_id, IntrTargetPriority::Machine)
);
crate::println!(
"Hart0S threshold = {}",
plic.get_threshold(hart_id, IntrTargetPriority::Supervisor)
);
crate::println!("1 prio = {}", plic.get_priority(1));
crate::println!("10 prio = {}", plic.get_priority(10));
unsafe { sie::set_sext(); }
unsafe {
sie::set_sext();
}
}
use crate::drivers::block::BLOCK_DEVICE;
pub fn irq_handler() {
let mut plic = unsafe { PLIC::new(VIRT_PLIC) };
let intr_src_id = plic.claim(0, IntrTargetPriority::Supervisor);
match intr_src_id {
1 => BLOCK_DEVICE.handle_irq(),
10 => UART.handle_irq(),
_ => panic!("unsupported IRQ {}", intr_src_id),
}
plic.complete(0, IntrTargetPriority::Supervisor, intr_src_id);