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use crate::svc;
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
#[repr(u64)]
pub enum FunctionId {
Invalid = 0,
GenerateRandomBytes = 0xC3000006
}
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
#[repr(C)]
pub struct Input {
pub function_id: FunctionId,
pub arguments: [u64; 7],
}
const_assert!(core::mem::size_of::<Input>() == 0x40);
impl Input {
pub const fn new(function_id: FunctionId) -> Self {
Self { function_id, arguments: [0; 7] }
}
}
#[derive(Copy, Clone, PartialEq, Eq, Debug, Default)]
#[repr(u64)]
pub enum Result {
#[default]
Success = 0,
NotImplemented = 1,
InvalidArgument = 2,
InProgress = 3,
NoAsyncOperation = 4,
InvalidAsyncOperation = 5,
NotPermitted = 6
}
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
#[repr(C)]
pub struct Output {
pub result: Result,
pub arguments: [u64; 7],
}
const_assert!(core::mem::size_of::<Output>() == core::mem::size_of::<Input>());
#[derive(Copy, Clone, PartialEq, Eq, Debug, Default)]
#[repr(C)]
pub struct Arguments {
pub arguments: [u64; 8]
}
const_assert!(core::mem::size_of::<Arguments>() == core::mem::size_of::<Output>());
impl Arguments {
pub fn from_input(input: Input) -> Self {
unsafe {
core::mem::transmute(input)
}
}
pub fn to_output(self) -> Output {
unsafe {
core::mem::transmute(self)
}
}
}
pub const GENERATE_RANDOM_BYTES_MAX_SIZE: usize = 0x38;
pub fn generate_random_bytes(dst: *mut u8, size: usize) -> Result {
let mut input = Input::new(FunctionId::GenerateRandomBytes);
input.arguments[0] = size as u64;
let output = svc::call_secure_monitor(input);
if output.result == Result::Success {
unsafe {
core::ptr::copy(output.arguments.as_ptr().offset(1) as *const u8, dst, size);
}
}
output.result
}