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https://github.com/RGBCube/serenity
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a2810d3cf8
This gives the processor the hint that it is in a hot loop and allows us to do other work in between
49 lines
1.1 KiB
C++
49 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_64/BochsDebugOutput.h>
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#include <Kernel/Arch/x86_64/IO.h>
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#include <Kernel/Arch/x86_64/Processor.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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Processor::wait_check();
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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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