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84 lines
2.9 KiB
Rust
84 lines
2.9 KiB
Rust
/*
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* MIT License
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*
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* Copyright (c) 2018-2019 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(range_contains)]
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mod delays;
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mod gpio;
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mod mbox;
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mod memory;
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mod uart;
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fn kernel_entry() -> ! {
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let gpio = gpio::GPIO::new(memory::map::physical::GPIO_BASE);
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let mut mbox = mbox::Mbox::new(memory::map::physical::VIDEOCORE_MBOX_BASE);
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{
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// Before the MMU is live, instantiate a UART driver with the physical address
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let uart = uart::Uart::new(memory::map::physical::UART_BASE);
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// set up serial console
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match uart.init(&mut mbox, &gpio) {
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Ok(_) => uart.puts("\n[0] UART is live!\n"),
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Err(_) => loop {
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cortex_a::asm::wfe() // If UART fails, abort early
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},
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}
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uart.puts("[1] Press a key to continue booting... ");
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uart.getc();
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uart.puts("Greetings fellow Rustacean!\n");
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memory::mmu::print_features(&uart);
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match unsafe { memory::mmu::init() } {
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Err(s) => {
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uart.puts("[2][Error] MMU: ");
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uart.puts(s);
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uart.puts("\n");
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}
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// The following write is already using the identity mapped
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// translation in the LVL2 table.
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Ok(()) => uart.puts("[2] MMU online.\n"),
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}
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} // After this closure, the UART instance is not valid anymore.
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// Instantiate a new UART using the remapped address. No need to init()
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// again, though.
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let uart = uart::Uart::new(memory::map::virt::REMAPPED_UART_BASE);
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uart.puts("\nWriting through the virtual mapping at base address 0x");
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uart.hex(memory::map::virt::REMAPPED_UART_BASE as u64);
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uart.puts(".\n");
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// echo everything back
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loop {
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uart.send(uart.getc());
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}
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}
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raspi3_boot::entry!(kernel_entry);
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