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Kernel: Abstract platform-specific serial port access from kprintf
kprintf should not really care about the hardware-specific details of each UART or serial port out there, so instead of using x86 specific instructions, let's ensure that we will compile only the relevant code for debug output for a targeted-specific platform.
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6 changed files with 109 additions and 28 deletions
48
Kernel/Arch/x86/common/DebugOutput.cpp
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48
Kernel/Arch/x86/common/DebugOutput.cpp
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/*
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* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Arch/DebugOutput.h>
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#include <Kernel/Arch/x86/IO.h>
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#include <Kernel/Arch/x86/common/BochsDebugOutput.h>
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namespace Kernel {
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static constexpr u16 serial_com1_io_port = 0x3F8;
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void bochs_debug_output(char ch)
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{
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IO::out8(IO::BOCHS_DEBUG_PORT, ch);
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}
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void debug_output(char ch)
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{
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static bool serial_ready = false;
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static bool was_cr = false;
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if (!serial_ready) {
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IO::out8(serial_com1_io_port + 1, 0x00);
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IO::out8(serial_com1_io_port + 3, 0x80);
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IO::out8(serial_com1_io_port + 0, 0x02);
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IO::out8(serial_com1_io_port + 1, 0x00);
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IO::out8(serial_com1_io_port + 3, 0x03);
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IO::out8(serial_com1_io_port + 2, 0xC7);
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IO::out8(serial_com1_io_port + 4, 0x0B);
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serial_ready = true;
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}
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while ((IO::in8(serial_com1_io_port + 5) & 0x20) == 0)
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;
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if (ch == '\n' && !was_cr)
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IO::out8(serial_com1_io_port, '\r');
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IO::out8(serial_com1_io_port, ch);
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was_cr = ch == '\r';
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}
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}
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