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/*
Copyright 2021-2023 Gabriel Jensen.
This file is part of Luma.
Luma is free software: you can redistribute it
and/or modify it under the terms of the GNU
Affero General Public License as published by
the Free Software Foundation, either version 3
of the License, or (at your option) any later
version.
Luma is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Affero General Public License for more details.
You should have received a copy of the GNU
Affero General Public License along with Luma.
If not, see <https://www.gnu.org/licenses/>.
*/
#[repr(u8)]
#[derive(Clone, Copy)]
pub enum CpuMode {
User = 0b10000,
FastInterruptRequest = 0b10001,
InterruptRequest = 0b10010,
Supervisor = 0b10011,
Abort = 0b10111,
Undefined = 0b11011,
System = 0b11111,
}
impl CpuMode {
pub fn from_raw(raw: u8) -> Self {
use CpuMode::*;
return match raw {
0b10000 => User,
0b10001 => FastInterruptRequest,
0b10010 => InterruptRequest,
0b10011 => Supervisor,
0b10111 => Abort,
0b11011 => Undefined,
0b11111 => System,
_ => panic!("invalid cpu mode {raw:#010b}"),
};
}
pub fn name(self) -> &'static str {
use CpuMode::*;
return match self {
Abort => "abt",
FastInterruptRequest => "fiq",
InterruptRequest => "irq",
Supervisor => "svc",
System => "sys",
Undefined => "und",
User => "usr",
};
}
}
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