28 lines
622 B
Rust
28 lines
622 B
Rust
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const SERIAL_BASE: *mut u8 = 0x16000000 as *mut u8;
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const SERIAL_FLAG_REGISTER: *const u8 = 0x16000018 as *const u8;
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const SERIAL_BUFFER_FULL: u8 = (1 << 5);
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unsafe fn putc (c: u8)
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{
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/* Wait until the serial buffer is empty */
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while *SERIAL_FLAG_REGISTER & SERIAL_BUFFER_FULL == SERIAL_BUFFER_FULL {}
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/* Put our character, c, into the serial buffer */
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*SERIAL_BASE = c;
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}
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unsafe fn puts(string: &str)
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{
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for b in string.bytes() {
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putc(b);
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}
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}
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#[no_mangle]
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#[naked]
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pub unsafe extern fn kstart() -> ! {
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asm!("mov sp, 0x18000" : : : : "volatile");
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puts("TEST\r\n");
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loop {}
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}
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