mirror of
https://github.com/RGBCube/serenity
synced 2025-05-16 10:14:57 +00:00
e362b56b4f
The kernel and its static data structures are no longer identity-mapped in the bottom 8MB of the address space, but instead move above 3GB. The first 8MB above 3GB are pseudo-identity-mapped to the bottom 8MB of the physical address space. But things don't have to stay this way! Thanks to Jesse who made an earlier attempt at this, it was really easy to get device drivers working once the page tables were in place! :^) Fixes #734.
564 lines
13 KiB
C++
564 lines
13 KiB
C++
#include "VirtualConsole.h"
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#include "IO.h"
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#include "StdLib.h"
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#include <Kernel/Heap/kmalloc.h>
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#include <AK/String.h>
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#include <Kernel/Arch/i386/CPU.h>
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#include <Kernel/Devices/KeyboardDevice.h>
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static u8* s_vga_buffer;
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static VirtualConsole* s_consoles[6];
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static int s_active_console;
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void VirtualConsole::get_vga_cursor(u8& row, u8& column)
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{
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u16 value;
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IO::out8(0x3d4, 0x0e);
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value = IO::in8(0x3d5) << 8;
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IO::out8(0x3d4, 0x0f);
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value |= IO::in8(0x3d5);
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row = value / columns();
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column = value % columns();
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}
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void VirtualConsole::flush_vga_cursor()
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{
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u16 value = m_current_vga_start_address + (m_cursor_row * columns() + m_cursor_column);
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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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void VirtualConsole::initialize()
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{
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s_vga_buffer = (u8*)0xc00b8000;
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memset(s_consoles, 0, sizeof(s_consoles));
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s_active_console = -1;
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}
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VirtualConsole::VirtualConsole(unsigned index, InitialContents initial_contents)
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: TTY(4, index)
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, m_index(index)
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{
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sprintf(m_tty_name, "/dev/tty%u", m_index);
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set_size(80, 25);
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m_horizontal_tabs = static_cast<u8*>(kmalloc_eternal(columns()));
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for (unsigned i = 0; i < columns(); ++i)
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m_horizontal_tabs[i] = (i % 8) == 0;
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// Rightmost column is always last tab on line.
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m_horizontal_tabs[columns() - 1] = 1;
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s_consoles[index] = this;
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m_buffer = (u8*)kmalloc_eternal(rows() * columns() * 2);
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if (initial_contents == AdoptCurrentVGABuffer) {
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memcpy(m_buffer, s_vga_buffer, rows() * columns() * 2);
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get_vga_cursor(m_cursor_row, m_cursor_column);
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} else {
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u16* line_mem = reinterpret_cast<u16*>(m_buffer);
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for (u16 i = 0; i < rows() * columns(); ++i)
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line_mem[i] = 0x0720;
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}
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}
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VirtualConsole::~VirtualConsole()
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{
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ASSERT_NOT_REACHED();
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}
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void VirtualConsole::clear()
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{
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u16* linemem = m_active ? (u16*)s_vga_buffer : (u16*)m_buffer;
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for (u16 i = 0; i < rows() * columns(); ++i)
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linemem[i] = 0x0720;
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if (m_active)
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set_vga_start_row(0);
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set_cursor(0, 0);
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}
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void VirtualConsole::switch_to(unsigned index)
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{
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if ((int)index == s_active_console)
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return;
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ASSERT(index < 6);
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ASSERT(s_consoles[index]);
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InterruptDisabler disabler;
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if (s_active_console != -1) {
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auto* active_console = s_consoles[s_active_console];
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// We won't know how to switch away from a graphical console until we
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// can set the video mode on our own. Just stop anyone from trying for
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// now.
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if (active_console->is_graphical())
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return;
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active_console->set_active(false);
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}
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dbgprintf("VC: Switch to %u (%p)\n", index, s_consoles[index]);
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s_active_console = index;
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s_consoles[s_active_console]->set_active(true);
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Console::the().set_implementation(s_consoles[s_active_console]);
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}
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void VirtualConsole::set_active(bool b)
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{
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if (b == m_active)
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return;
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InterruptDisabler disabler;
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m_active = b;
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if (!m_active) {
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memcpy(m_buffer, m_current_vga_window, rows() * columns() * 2);
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KeyboardDevice::the().set_client(nullptr);
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return;
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}
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memcpy(s_vga_buffer, m_buffer, rows() * columns() * 2);
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set_vga_start_row(0);
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flush_vga_cursor();
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KeyboardDevice::the().set_client(this);
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}
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inline bool is_valid_parameter_character(u8 ch)
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{
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return ch >= 0x30 && ch <= 0x3f;
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}
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inline bool is_valid_intermediate_character(u8 ch)
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{
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return ch >= 0x20 && ch <= 0x2f;
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}
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inline bool is_valid_final_character(u8 ch)
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{
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return ch >= 0x40 && ch <= 0x7e;
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}
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enum class VGAColor : u8 {
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Black = 0,
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Blue,
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Green,
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Cyan,
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Red,
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Magenta,
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Brown,
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LightGray,
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DarkGray,
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BrightBlue,
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BrightGreen,
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BrightCyan,
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BrightRed,
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BrightMagenta,
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Yellow,
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White,
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};
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enum class ANSIColor : u8 {
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Black = 0,
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Red,
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Green,
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Brown,
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Blue,
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Magenta,
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Cyan,
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LightGray,
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DarkGray,
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BrightRed,
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BrightGreen,
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Yellow,
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BrightBlue,
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BrightMagenta,
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BrightCyan,
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White,
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};
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static inline VGAColor ansi_color_to_vga(ANSIColor color)
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{
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switch (color) {
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case ANSIColor::Black:
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return VGAColor::Black;
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case ANSIColor::Red:
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return VGAColor::Red;
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case ANSIColor::Brown:
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return VGAColor::Brown;
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case ANSIColor::Blue:
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return VGAColor::Blue;
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case ANSIColor::Magenta:
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return VGAColor::Magenta;
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case ANSIColor::Green:
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return VGAColor::Green;
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case ANSIColor::Cyan:
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return VGAColor::Cyan;
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case ANSIColor::LightGray:
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return VGAColor::LightGray;
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case ANSIColor::DarkGray:
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return VGAColor::DarkGray;
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case ANSIColor::BrightRed:
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return VGAColor::BrightRed;
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case ANSIColor::BrightGreen:
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return VGAColor::BrightGreen;
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case ANSIColor::Yellow:
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return VGAColor::Yellow;
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case ANSIColor::BrightBlue:
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return VGAColor::BrightBlue;
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case ANSIColor::BrightMagenta:
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return VGAColor::BrightMagenta;
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case ANSIColor::BrightCyan:
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return VGAColor::BrightCyan;
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case ANSIColor::White:
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return VGAColor::White;
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}
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ASSERT_NOT_REACHED();
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return VGAColor::LightGray;
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}
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static inline u8 ansi_color_to_vga(u8 color)
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{
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return (u8)ansi_color_to_vga((ANSIColor)color);
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}
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void VirtualConsole::escape$m(const Vector<unsigned>& params)
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{
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for (auto param : params) {
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switch (param) {
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case 0:
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// Reset
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m_current_attribute = 0x07;
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break;
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case 1:
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// Bold
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m_current_attribute |= 8;
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break;
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case 30:
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case 31:
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case 32:
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case 33:
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case 34:
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case 35:
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case 36:
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case 37:
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// Foreground color
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m_current_attribute &= ~0x7;
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m_current_attribute |= ansi_color_to_vga(param - 30);
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break;
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case 40:
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case 41:
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case 42:
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case 43:
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case 44:
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case 45:
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case 46:
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case 47:
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// Background color
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m_current_attribute &= ~0x70;
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m_current_attribute |= ansi_color_to_vga(param - 30) << 8;
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break;
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}
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}
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}
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void VirtualConsole::escape$s(const Vector<unsigned>&)
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{
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m_saved_cursor_row = m_cursor_row;
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m_saved_cursor_column = m_cursor_column;
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}
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void VirtualConsole::escape$u(const Vector<unsigned>&)
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{
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set_cursor(m_saved_cursor_row, m_saved_cursor_column);
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}
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void VirtualConsole::escape$H(const Vector<unsigned>& params)
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{
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unsigned row = 1;
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unsigned col = 1;
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if (params.size() >= 1)
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row = params[0];
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if (params.size() >= 2)
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col = params[1];
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set_cursor(row - 1, col - 1);
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}
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void VirtualConsole::escape$A(const Vector<unsigned>& params)
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{
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int num = 1;
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if (params.size() >= 1)
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num = params[0];
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int new_row = (int)m_cursor_row - num;
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if (new_row < 0)
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new_row = 0;
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set_cursor(new_row, m_cursor_column);
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}
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void VirtualConsole::escape$D(const Vector<unsigned>& params)
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{
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int num = 1;
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if (params.size() >= 1)
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num = params[0];
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int new_column = (int)m_cursor_column - num;
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if (new_column < 0)
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new_column = 0;
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set_cursor(m_cursor_row, new_column);
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}
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void VirtualConsole::escape$J(const Vector<unsigned>& params)
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{
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int mode = 0;
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if (params.size() >= 1)
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mode = params[0];
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switch (mode) {
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case 0:
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// FIXME: Clear from cursor to end of screen.
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ASSERT_NOT_REACHED();
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break;
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case 1:
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// FIXME: Clear from cursor to beginning of screen.
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ASSERT_NOT_REACHED();
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break;
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case 2:
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clear();
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break;
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case 3:
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// FIXME: <esc>[3J should also clear the scrollback buffer.
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clear();
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break;
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}
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}
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void VirtualConsole::execute_escape_sequence(u8 final)
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{
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auto paramparts = String::copy(m_parameters).split(';');
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Vector<unsigned> params;
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for (auto& parampart : paramparts) {
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bool ok;
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unsigned value = parampart.to_uint(ok);
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if (!ok) {
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// FIXME: Should we do something else?
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return;
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}
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params.append(value);
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}
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switch (final) {
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case 'A':
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escape$A(params);
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break;
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case 'D':
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escape$D(params);
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break;
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case 'H':
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escape$H(params);
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break;
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case 'J':
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escape$J(params);
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break;
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case 'm':
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escape$m(params);
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break;
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case 's':
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escape$s(params);
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break;
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case 'u':
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escape$u(params);
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break;
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default:
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break;
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}
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m_parameters.clear();
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m_intermediates.clear();
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}
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void VirtualConsole::clear_vga_row(u16 row)
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{
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u16* linemem = (u16*)&m_current_vga_window[row * 160];
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for (u16 i = 0; i < columns(); ++i)
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linemem[i] = 0x0720;
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}
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void VirtualConsole::scroll_up()
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{
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if (m_cursor_row == (rows() - 1)) {
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if (m_active) {
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if (m_vga_start_row >= 160) {
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memcpy(s_vga_buffer, m_current_vga_window + 160, (rows() - 1) * columns() * 2);
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set_vga_start_row(0);
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clear_vga_row(24);
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} else {
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set_vga_start_row(m_vga_start_row + 1);
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clear_vga_row(24);
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}
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} else {
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memmove(m_buffer, m_buffer + 160, 160 * 24);
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u16* linemem = (u16*)&m_buffer[24 * 160];
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for (u16 i = 0; i < columns(); ++i)
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linemem[i] = 0x0720;
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}
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} else {
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++m_cursor_row;
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}
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m_cursor_column = 0;
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}
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void VirtualConsole::set_cursor(unsigned row, unsigned column)
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{
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ASSERT(row < rows());
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ASSERT(column < columns());
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m_cursor_row = row;
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m_cursor_column = column;
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if (m_active)
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flush_vga_cursor();
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}
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void VirtualConsole::put_character_at(unsigned row, unsigned column, u8 ch)
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{
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ASSERT(row < rows());
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ASSERT(column < columns());
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u16 cur = (row * 160) + (column * 2);
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if (m_active) {
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u16 cur = (row * 160) + (column * 2);
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m_current_vga_window[cur] = ch;
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m_current_vga_window[cur + 1] = m_current_attribute;
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} else {
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m_buffer[cur] = ch;
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m_buffer[cur + 1] = m_current_attribute;
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}
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}
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void VirtualConsole::on_char(u8 ch)
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{
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// ignore writes in graphical mode
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if (m_graphical)
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return;
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switch (m_escape_state) {
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case ExpectBracket:
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if (ch == '[')
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m_escape_state = ExpectParameter;
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else
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m_escape_state = Normal;
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return;
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case ExpectParameter:
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if (is_valid_parameter_character(ch)) {
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m_parameters.append(ch);
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return;
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}
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m_escape_state = ExpectIntermediate;
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[[fallthrough]];
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case ExpectIntermediate:
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if (is_valid_intermediate_character(ch)) {
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m_intermediates.append(ch);
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return;
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}
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m_escape_state = ExpectFinal;
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[[fallthrough]];
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case ExpectFinal:
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if (is_valid_final_character(ch)) {
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m_escape_state = Normal;
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execute_escape_sequence(ch);
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return;
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}
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m_escape_state = Normal;
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return;
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case Normal:
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break;
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}
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switch (ch) {
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case '\0':
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return;
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case '\033':
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m_escape_state = ExpectBracket;
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return;
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case 8: // Backspace
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if (m_cursor_column) {
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set_cursor(m_cursor_row, m_cursor_column - 1);
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put_character_at(m_cursor_row, m_cursor_column, ' ');
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return;
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}
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break;
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case '\a':
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// FIXME: Bell!
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return;
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case '\t': {
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for (unsigned i = m_cursor_column; i < columns(); ++i) {
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if (m_horizontal_tabs[i]) {
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set_cursor(m_cursor_row, i);
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return;
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}
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}
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return;
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}
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case '\n':
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scroll_up();
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set_cursor(m_cursor_row, m_cursor_column);
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return;
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}
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put_character_at(m_cursor_row, m_cursor_column, ch);
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++m_cursor_column;
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if (m_cursor_column >= columns())
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scroll_up();
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set_cursor(m_cursor_row, m_cursor_column);
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}
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void VirtualConsole::on_key_pressed(KeyboardDevice::Event key)
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{
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// ignore keyboard in graphical mode
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if (m_graphical)
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return;
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if (!key.is_press())
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return;
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if (key.ctrl()) {
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if (key.character >= 'a' && key.character <= 'z') {
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emit(key.character - 'a' + 1);
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return;
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} else if (key.character == '\\') {
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emit(0x1c);
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return;
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}
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}
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emit(key.character);
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}
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void VirtualConsole::on_sysconsole_receive(u8 ch)
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{
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InterruptDisabler disabler;
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auto old_attribute = m_current_attribute;
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m_current_attribute = 0x03;
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on_char(ch);
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m_current_attribute = old_attribute;
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}
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ssize_t VirtualConsole::on_tty_write(const u8* data, ssize_t size)
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{
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InterruptDisabler disabler;
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for (ssize_t i = 0; i < size; ++i)
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on_char(data[i]);
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return size;
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}
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StringView VirtualConsole::tty_name() const
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{
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return m_tty_name;
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}
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void VirtualConsole::echo(u8 ch)
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{
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if (should_echo_input()) {
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on_tty_write(&ch, 1);
|
|
}
|
|
}
|
|
|
|
void VirtualConsole::set_vga_start_row(u16 row)
|
|
{
|
|
m_vga_start_row = row;
|
|
m_current_vga_start_address = row * columns();
|
|
m_current_vga_window = s_vga_buffer + row * 160;
|
|
IO::out8(0x3d4, 0x0c);
|
|
IO::out8(0x3d5, MSB(m_current_vga_start_address));
|
|
IO::out8(0x3d4, 0x0d);
|
|
IO::out8(0x3d5, LSB(m_current_vga_start_address));
|
|
}
|