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https://github.com/RGBCube/serenity
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22aea9f659
This makes sure that the debug message are properly aligned when running the kernel bare-metal on a Raspberry Pi. While we are here, also move the function out of line.
37 lines
733 B
C++
37 lines
733 B
C++
/*
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* Copyright (c) 2021, Nico Weber <thakis@chromium.org>
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* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Types.h>
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namespace Kernel::RPi {
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struct UARTRegisters;
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// Abstracts the PL011 UART on a Raspberry Pi.
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// (The BCM2711 on a Raspberry Pi 4 has five PL011 UARTs; this is always the first of those.)
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class UART {
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public:
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static UART& the();
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void send(u32 c);
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u32 receive();
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void print_str(char const*, size_t);
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private:
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UART();
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void set_baud_rate(int baud_rate, int uart_frequency_in_hz);
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void wait_until_we_can_send();
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void wait_until_we_can_receive();
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UARTRegisters volatile* m_registers;
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};
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}
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