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80 lines
2.4 KiB
Rust
80 lines
2.4 KiB
Rust
/*
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* MIT License
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*
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* Copyright (c) 2018 Andre Richter <andre.o.richter@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#![no_std]
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#![no_main]
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#![feature(asm)]
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const MMIO_BASE: u32 = 0x3F00_0000;
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mod gpio;
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mod mbox;
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mod uart;
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fn kernel_entry() -> ! {
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let mut mbox = mbox::Mbox::new();
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let uart = uart::Uart::new();
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// set up serial console
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if uart.init(&mut mbox).is_err() {
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unsafe { asm!("wfe" :::: "volatile") }; // If UART fails, abort early
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}
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// Say hello
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for c in "RBIN64\r\n".chars() {
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uart.send(c);
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}
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// Notify raspbootcom to send the kernel
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uart.send(3 as char);
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uart.send(3 as char);
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uart.send(3 as char);
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// Read the kernel's size
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let mut size: u32 = u32::from(uart.getc());
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size |= u32::from(uart.getc()) << 8;
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size |= u32::from(uart.getc()) << 16;
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size |= u32::from(uart.getc()) << 24;
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// For now, blindly trust it's not too big
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uart.send('O');
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uart.send('K');
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let kernel_addr: *mut u8 = 0x80_000 as *mut u8;
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unsafe {
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// Read the kernel byte by byte
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for i in 0..size {
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*kernel_addr.offset(i as isize) = uart.getc();
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}
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}
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// Use black magic to get a function pointer to 0x80_000
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let kernel: extern "C" fn() -> ! = unsafe { core::mem::transmute(kernel_addr as *const ()) };
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// Jump to loaded kernel and never return!
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kernel()
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}
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raspi3_boot::entry!(kernel_entry);
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