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https://github.com/RGBCube/serenity
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a02c9c9569
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.
48 lines
1.1 KiB
C++
48 lines
1.1 KiB
C++
/*
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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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