Function check_region

api/src/mm.rs:21–39

(start: VirtAddr, layout: Layout, access_flags: MappingFlags)

use starry_vm::{vm_load_until_nul, vm_read_slice, vm_write_slice};

fn check_region(start: VirtAddr, layout: Layout, access_flags: MappingFlags) -> AxResult<()> {
    let align = layout.align();
    if start.as_usize() & (align - 1) != 0 {
        return Err(AxError::BadAddress);
    }

    let curr = current();
    let mut aspace = curr.as_thread().proc_data.aspace.lock();

    if !aspace.can_access_range(start, layout.size(), access_flags) {
        return Err(AxError::BadAddress);
    }

    let page_start = start.align_down_4k();
    let page_end = (start + layout.size()).align_up_4k();
    aspace.populate_area(page_start, page_end - page_start, access_flags)?;

    Ok(())
}

fn check_null_terminated<T: PartialEq + Default>(
    start: VirtAddr,