allocate DMA frame

This commit is contained in:
TheOddGarlic 2022-08-08 22:55:28 +03:00
parent 3836416891
commit 6bc74e896c
4 changed files with 96 additions and 3 deletions

View file

@ -34,7 +34,7 @@ pub fn start(boot_info: &'static BootInfo) -> ! {
allocator::init_heap(&mut mapper, &mut frame_allocator).expect("heap initialization failed");
crate::kmain::kernel_main();
crate::kmain::kernel_main(mapper, frame_allocator);
}
#[allow(unused)]

View file

@ -19,6 +19,9 @@ pub use enums::*;
pub mod port;
use port::*;
// MassStorage_IDE (0x0101)
pub mod piix;
use self::devices::DeviceID;
// PciDeviceInfo ///////////////////////////////////////////////////////////////

View file

@ -0,0 +1,80 @@
// FIXME: platform agnostic paging stuff
use x86_64::structures::paging::{PhysFrame, FrameAllocator, Size4KiB, mapper::MapToError, Mapper, Page};
use x86_64::VirtAddr;
use super::{PciDeviceInfo, check_device};
const PRDT_START: u64 = 0x_ffff_ffff_0000_0000;
pub struct Piix {
device_info: PciDeviceInfo,
prdt_frame: Option<PhysFrame>,
}
impl Piix {
pub fn new(bus: u8, device: u8) -> Option<Self> {
let device_info = check_device(bus, device)?;
trace!("device_info: {device_info}");
Some(Self {
device_info,
prdt_frame: None,
})
}
pub fn allocate_dma_frame(
&mut self,
mapper: &mut impl Mapper<Size4KiB>,
frame_allocator: &mut impl FrameAllocator<Size4KiB>,
) -> Result<(), MapToError<Size4KiB>> {
use x86_64::structures::paging::PageTableFlags as Flags;
let prdt_frame = frame_allocator.allocate_frame()
.ok_or(MapToError::FrameAllocationFailed)?;
let flags = Flags::NO_CACHE | Flags::PRESENT | Flags::WRITABLE;
unsafe {
mapper.map_to(
Page::containing_address(VirtAddr::new(PRDT_START)),
prdt_frame,
flags,
frame_allocator,
)?.flush()
}
trace!("{prdt_frame:#?}");
self.prdt_frame = Some(prdt_frame);
Ok(())
}
pub fn read(&self) {
// bus master interface base address
let bmiba = self.device_info.bars[4] as *mut BusMasterInterface;
// bmiba.bmidtpp = prdt;
}
}
#[derive(Copy, Clone, Debug)]
#[repr(C, packed)]
struct BusMasterInterface {
/// Bus Master IDE Command (primary)
pub bmicp: u8,
/// Reserved
pub _0: u8,
/// Bus Master IDE Status (primary)
pub bmisp: u8,
/// Reserved
pub _1: u8,
/// Bus Master IDE Descriptor Table Pointer (primary)
pub bmidtpp: u32,
/// Bus Master IDE Command (secondary)
pub bmics: u8,
/// Reserved
pub _2: u8,
/// Bus Master IDE Status (secondary)
pub bmiss: u8,
/// Reserved
pub _3: u8,
/// Bus Master IDE Descriptor Table Pointer (secondary)
pub bmidtps: u32,
}

View file

@ -9,6 +9,7 @@
use core::sync::atomic::AtomicU64;
use crate::arch::{drivers::sysinfo::master, init, sloop};
use crate::devices::pci::piix::Piix;
use crate::relib::network::socket::{SimpleSock, Socket};
use crate::{
boot_conf::KernelConfig, scratchpad, systeminfo::RELEASE_TYPE, TERM,
@ -17,12 +18,17 @@ use crate::{filesystem, hardware};
use kernel::KERNEL_VERSION;
use spin::Lazy;
// FIXME: platform agnostic paging stuff
use x86_64::structures::paging::{Mapper, FrameAllocator, Size4KiB};
// TODO: Change this structure to allow for multiple cores loaded
pub static KERNEL_CONF: Lazy<KernelConfig> = Lazy::new(KernelConfig::new);
/// The main entry point of the kernel
#[no_mangle]
pub fn kernel_main() -> ! {
pub fn kernel_main(
mut mapper: impl Mapper<Size4KiB>,
mut frame_allocator: impl FrameAllocator<Size4KiB>,
) -> ! {
init::init();
// /*
@ -45,6 +51,10 @@ pub fn kernel_main() -> ! {
filesystem::init().unwrap();
// FIXME: unhardcode this and do device discovery
let mut piix = Piix::new(0, 3).unwrap();
piix.allocate_dma_frame(&mut mapper, &mut frame_allocator).unwrap();
/*
// println!("abc");