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use std;
use std::cell::RefCell;
use std::rc::Rc;
use rustv::isa;
use rustv::memory::SharedMemory;
use rustv::register_file::RegisterFile;
use rustv::syscall;
use rustv::trap::Trap;
use shareable_cache::ShareableCache;
pub struct SyscallHandler<'a> {
memory: SharedMemory<'a>,
caches: Vec<Rc<RefCell<ShareableCache<'a>>>>,
}
impl<'a> SyscallHandler<'a> {
pub fn new(memory: SharedMemory<'a>,
caches: Vec<Rc<RefCell<ShareableCache<'a>>>>)
-> SyscallHandler<'a> {
SyscallHandler {
memory: memory,
caches: caches,
}
}
}
impl<'a> SyscallHandler<'a> {
fn print(&mut self, core_id: usize,
registers: &mut RegisterFile) -> Option<Trap> {
let mut base = registers.read_word(isa::Register::X11);
let mut string = vec![];
loop {
let c = self.memory.borrow_mut().read_byte(base);
if let Ok(0x00) = c {
break;
}
else if let Ok(c) = c {
string.push(c);
}
base += 1;
}
let result = std::str::from_utf8(&string);
if let Ok(string) = result {
println!("{}", string);
}
else {
println!("Error printing string: not valid UTF-8: {:?}", result);
}
None
}
fn enable_secondary(&mut self, core_id: usize,
registers: &mut RegisterFile) -> Option<Trap> {
self.caches[core_id].borrow_mut().enable_secondary();
None
}
fn disable_secondary(&mut self, core_id: usize,
registers: &mut RegisterFile) -> Option<Trap> {
self.caches[core_id].borrow_mut().disable_secondary();
None
}
}
impl<'a> syscall::SyscallHandler for SyscallHandler<'a> {
// TODO: is trap really appropriate here?
fn syscall(&mut self, core_id: usize,
registers: &mut RegisterFile) -> Option<Trap> {
let syscall_number = registers.read_word(isa::Register::X10);
match syscall_number {
22 => self.print(core_id, registers),
23 => self.enable_secondary(core_id, registers),
24 => self.disable_secondary(core_id, registers),
_ => {
// TODO: some sort of error reporting
None
}
}
}
}
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