| // Copyright 2026 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| use bitrs::layout; |
| |
| // Models the x86 EFLAGS register. |
| layout!({ |
| pub struct Eflags(u32); |
| { |
| let __ @ 31..22 = 0; |
| let id @ 21; // ID flag |
| let vip @ 20; // Virtual interrupt pending |
| let vif @ 19; // Virtual interrupt |
| let ac @ 18; // Alignment check / access control |
| let vm @ 17; // Virtual-8086 mode |
| let rf @ 16; // Resume flag |
| let __ @ 15 = 0; |
| let nt @ 14; // Nested task |
| let iopl @ 13..12; // I/O privilege level |
| let of @ 11; // Overflow flag |
| let df @ 10; // Direction flag |
| let if_ @ 9 = 1; // Interrupt enable flag |
| let tf @ 8; // Trap flag |
| let sf @ 7; // Sign flag |
| let zf @ 6; // Zero flag |
| let __ @ 5 = 0; |
| let af @ 4; // Auxiliary carry flag |
| let __ @ 3 = 0; |
| let pf @ 2; // Parity flag |
| let __ @ 1 = 1; |
| let cf @ 0; // Carry flag |
| } |
| }); |
| |
| fn main() { |
| macro_rules! print_formatted { |
| ($obj:ident) => { |
| let obj_name = stringify!($obj); |
| println!("{obj_name}: debug: {:?}", $obj); |
| println!("{obj_name}: lower hex: {:x}", $obj); |
| println!("{obj_name}: upper hex: {:X}", $obj); |
| println!("{obj_name}: octal: {:o}", $obj); |
| }; |
| } |
| |
| let new = Eflags::new(); |
| let default = Eflags::default(); |
| let custom = *Eflags::new().set_iopl(0b11).set_if_(true).set_zf(true).set_cf(true); |
| |
| print_formatted!(new); |
| print_formatted!(default); |
| print_formatted!(custom); |
| } |
