rCore/kernel/src/syscall/custom.rs

//! Custom nonstandard syscalls
use rcore_memory::memory_set::handler::Linear;
use rcore_memory::memory_set::MemoryAttr;
use super::*;
use crate::drivers::bus::pci;

pub fn sys_map_pci_device(vendor: usize, product: usize) -> SysResult {
    info!(
        "map_pci_device: vendor: {}, product: {}",
        vendor, product
    );
    if let Some(tag) = pci::find_device(vendor as u32, product as u32) {
        // Get BAR0 memory
        if let Some((base, len)) = unsafe { tag.get_bar_mem(0) } {
            let mut proc = process();
            let virt_addr = proc.memory_set.find_free_area(0, len);
            let attr = MemoryAttr::default().user();
            proc.memory_set.push(
                virt_addr,
                virt_addr + len,
                attr,
                Linear::new(base as isize - virt_addr as isize),
                "pci",
            );
            Ok(virt_addr)
        } else {
            Err(SysError::ENOENT)
        }
    } else {
        Err(SysError::ENOENT)
    }
}