faaadcf475
Note: this currently has a rustc compiler panic trying to use the `#[no_core]` attribute, which seems poorly supported
75 lines
1.3 KiB
Rust
75 lines
1.3 KiB
Rust
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#![feature(lang_items, no_core)]
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#![no_core]
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#![no_main]
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#[lang = "eh_personality"]
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extern fn eh_personality() {}
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#[lang = "panic_fmt"]
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fn panic_fmt() -> ! { loop {} }
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#[lang = "panic"]
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pub fn panic(_expr_file_line: &(&'static str, &'static str, u32)) -> ! { panic_fmt() }
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#[lang = "panic_location"]
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struct Location<'a> {
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_file: &'a str,
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_line: u32,
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_col: u32,
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}
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#[lang = "sized"]
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pub trait Sized {}
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#[lang = "copy"]
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trait Copy {}
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#[lang = "add"]
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pub trait Add<RHS=Self> {
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type Output;
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fn add(self, _rhs: RHS) -> Self::Output;
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}
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/* this can be bogus, apparently? */
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impl Add for usize {
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type Output = usize;
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fn add(self, _rhs: usize) -> usize { 1 }
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}
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#[lang = "mul"]
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pub trait Mul<RHS = Self> {
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type Output;
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fn mul(self, _rhs: RHS) -> Self::Output;
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}
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impl Mul for usize {
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type Output = usize;
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fn mul(self, _rhs: usize) -> usize { 1 }
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}
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#[no_mangle]
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pub extern fn rust_entry() {
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//white A on black
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let spec: u16 = 0x0f_41;
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write_to_coord(1, 2, spec);
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loop { }
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}
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const X86_COLS: usize = 80;
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#[allow(dead_code)]
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const X86_ROWS: usize = 25;
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const VRAM_OFFSET: usize = 0xb8000;
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fn write_to_coord(x: u8, y: u8, x86_specifier: u16) {
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unsafe {
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let offset = VRAM_OFFSET + (X86_COLS*2*(y as usize)) + (x as usize)*2;
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*(offset as *mut u16) = x86_specifier;
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}
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}
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