Function special_memory_chunk

kernel/src/process.rs:841–861

A memory chunk which maps a specific range of physical memory No frame allocation, so assumes that the physical memory is ok to use. # Arguments `thread` - The thread which will have the new chunk mapped `num_pages` - Number of 4k pages `start_physaddr` - Starting physical address. Must be page aligned

(
    thread: &Thread,
    num_pages: u64,
    start_physaddr: u64
)

///                      Must be page aligned
///
pub fn special_memory_chunk(
    thread: &Thread,
    num_pages: u64,
    start_physaddr: u64
) -> Result<(VirtAddr, PhysAddr), usize> {
    // Virtual address of the available page chunk
    let start_virtaddr = match memory::find_available_page_chunk(
        thread.page_table_physaddr) {
        Some(value) => value,
        None => return Err(syscalls::SYSCALL_ERROR_MEMORY)
    };

    match memory::create_physical_range_pages(
        thread.page_table_physaddr,
        start_virtaddr,
        num_pages,
        PhysAddr::new(start_physaddr)) {
        Ok(physaddr) => Ok((start_virtaddr, physaddr)),
        Err(_) => Err(syscalls::SYSCALL_ERROR_MEMORY)
    }
}

/// Free a memory chunk previously allocated with new_memory_chunk
pub fn free_memory_chunk(