Function sys_malloc

kernel/src/syscalls.rs:480–502

Allocates a chunk of memory Returns - handle in RDI - starting virtual address in RSI - starting physical address in RDX

(
    context_ptr: *mut Context,
    num_pages: u64,
    max_physaddr: u64
)

///  - starting virtual address in RSI
///  - starting physical address in RDX
fn sys_malloc(
    context_ptr: *mut Context,
    num_pages: u64,
    max_physaddr: u64
) {
    let context = unsafe {&mut (*context_ptr)};

    match process::new_memory_chunk(
        num_pages,
        max_physaddr) {
        Ok((virtaddr, physaddr)) => {
            context.rax = 0; // No error
            context.rdi = virtaddr.as_u64() as usize;
            context.rsi = physaddr.as_u64() as usize;
        }
        Err(code) => {
            context.rax = code;
            context.rdi = 0;
            context.rsi = 0;
            context.rdx = 0;
        }
    }
}

/// Free a memory chunk containing the given virtual address
fn sys_free(