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https://github.com/RGBCube/serenity
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48f3d762af
The new VGAIOArbiter class is now responsible to conduct x86-specific instructions to control VGA hardware from the old ISA ports. This allows us to ensure the GraphicsManagement code doesn't use x86-specific code, thus allowing it to be compiled within non-x86 kernel builds.
83 lines
2.1 KiB
C++
83 lines
2.1 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 <AK/Try.h>
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#include <Kernel/Arch/Delay.h>
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#include <Kernel/Arch/x86/CPU.h>
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#include <Kernel/Arch/x86/IO.h>
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#include <Kernel/Arch/x86/VGA/IOArbiter.h>
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namespace Kernel {
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NonnullOwnPtr<VGAIOArbiter> VGAIOArbiter::must_create(Badge<GraphicsManagement>)
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{
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return MUST(adopt_nonnull_own_or_enomem(new (nothrow) VGAIOArbiter()));
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}
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VGAIOArbiter::~VGAIOArbiter() = default;
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VGAIOArbiter::VGAIOArbiter() = default;
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void VGAIOArbiter::disable_vga_emulation_access_permanently(Badge<GraphicsManagement>)
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{
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SpinlockLocker locker(m_main_vga_lock);
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disable_vga_text_mode_console_cursor();
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IO::out8(0x3c4, 1);
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u8 sr1 = IO::in8(0x3c5);
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IO::out8(0x3c5, sr1 | 1 << 5);
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microseconds_delay(1000);
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m_vga_access_is_disabled = true;
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}
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void VGAIOArbiter::enable_vga_text_mode_console_cursor(Badge<GraphicsManagement>)
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{
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enable_vga_text_mode_console_cursor();
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}
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void VGAIOArbiter::enable_vga_text_mode_console_cursor()
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{
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SpinlockLocker locker(m_main_vga_lock);
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if (m_vga_access_is_disabled)
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return;
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IO::out8(0x3D4, 0xA);
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IO::out8(0x3D5, 0);
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}
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void VGAIOArbiter::disable_vga_text_mode_console_cursor(Badge<GraphicsManagement>)
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{
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disable_vga_text_mode_console_cursor();
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}
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void VGAIOArbiter::disable_vga_text_mode_console_cursor()
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{
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SpinlockLocker locker(m_main_vga_lock);
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if (m_vga_access_is_disabled)
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return;
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IO::out8(0x3D4, 0xA);
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IO::out8(0x3D5, 0x20);
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}
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void VGAIOArbiter::unblank_screen(Badge<GraphicsManagement>)
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{
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SpinlockLocker locker(m_main_vga_lock);
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if (m_vga_access_is_disabled)
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return;
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IO::out8(0x3c0, 0x20);
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}
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void VGAIOArbiter::set_vga_text_mode_cursor(Badge<GraphicsManagement>, size_t console_width, size_t x, size_t y)
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{
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SpinlockLocker locker(m_main_vga_lock);
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if (m_vga_access_is_disabled)
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return;
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enable_vga_text_mode_console_cursor();
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u16 value = y * console_width + x;
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IO::out8(0x3d4, 0x0e);
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IO::out8(0x3d5, MSB(value));
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IO::out8(0x3d4, 0x0f);
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IO::out8(0x3d5, LSB(value));
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}
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}
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