commit 66dd6670f63c34adeef69a805bd3f4c850bafa47 Author: Ryan Kennedy Date: Thu Mar 12 12:10:18 2020 -0500 Initial commit diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..96ef6c0 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +/target +Cargo.lock diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..2c9c03c --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,12 @@ +[package] +name = "vga" +version = "0.1.0" +authors = ["Ryan Kennedy "] +edition = "2018" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +conquer-once = "0.2.0" +spinning_top = "0.1.0" +x86_64 = "0.9.6" diff --git a/rust-toolchain b/rust-toolchain new file mode 100644 index 0000000..bf867e0 --- /dev/null +++ b/rust-toolchain @@ -0,0 +1 @@ +nightly diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..91f39e7 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,21 @@ +//! This crate provides vga specific functions, data structures, +//! and access to various registers. + +#![no_std] +#![warn(missing_docs)] + +pub mod vga; +pub mod vga_colors; +mod vga_configurations; +mod vga_fonts; +mod vga_registers; + +pub use vga::VGA; + +#[cfg(test)] +mod tests { + #[test] + fn it_works() { + assert_eq!(2 + 2, 4); + } +} diff --git a/src/vga.rs b/src/vga.rs new file mode 100644 index 0000000..9ba4b70 --- /dev/null +++ b/src/vga.rs @@ -0,0 +1,343 @@ +//! Provides access to the vga graphics card. + +use super::{ + vga_configurations::{ + VgaConfiguration, MODE_40X25_CONFIGURATION, MODE_40X50_CONFIGURATION, + MODE_640X480X16_CONFIGURATION, MODE_80X25_CONFIGURATION, + }, + vga_fonts::{VgaFont, TEXT_8X16_FONT, TEXT_8X8_FONT}, + vga_registers::{ + AttributeControllerRegisters, CrtcControllerIndex, CrtcControllerRegisters, EmulationMode, + GeneralRegisters, GraphicsControllerIndex, GraphicsControllerRegisters, SequencerIndex, + SequencerRegisters, + }, +}; +use conquer_once::spin::Lazy; +use spinning_top::Spinlock; + +/// Provides mutable access to the vga graphics card. +pub static VGA: Lazy> = Lazy::new(|| Spinlock::new(Vga::new())); + +/// Represents the starting address of the frame buffer for +/// various video modes. +#[derive(Debug, Copy, Clone)] +#[repr(u32)] +pub enum FrameBuffer { + /// The starting address for graphics modes. + GraphicsMode = 0xa0000, + /// The starting address for color text modes. + CgaMode = 0xb8000, + /// The starting address for monochrome text modes. + MdaMode = 0xb0000, +} + +impl From for FrameBuffer { + fn from(value: u8) -> FrameBuffer { + match value { + 0x1 => FrameBuffer::GraphicsMode, + 0x2 => FrameBuffer::MdaMode, + 0x3 => FrameBuffer::CgaMode, + _ => panic!("{:X} is not a valid FrameBuffer value", value), + } + } +} + +impl From for u32 { + fn from(value: FrameBuffer) -> u32 { + value as u32 + } +} + +/// Represents a plane for reading and writing vga data. +#[allow(dead_code)] +#[derive(Debug, Copy, Clone)] +#[repr(u8)] +pub enum Plane { + /// Represents `Plane 0 (0x0)`. + Plane0 = 0x0, + /// Represents `Plane 1 (0x1)`. + Plane1 = 0x1, + /// Represents `Plane 2 (0x2)`. + Plane2 = 0x2, + /// Represents `Plane 3 (0x3)`. + Plane3 = 0x3, +} + +impl From for u8 { + fn from(value: Plane) -> u8 { + value as u8 + } +} + +/// Represents a specified vga video mode. +#[derive(Debug, Clone, Copy)] +pub enum VideoMode { + /// Represents text mode 40x25. + Mode40x25, + /// Represents text mode 40x50. + Mode40x50, + /// Represents text mode 80x25. + Mode80x25, + /// Represents graphics mode 640x480x16. + Mode640x480x16, +} + +/// Represents a vga graphics card with it's common registers, +/// as well as the most recent video mode. +pub struct Vga { + general_registers: GeneralRegisters, + sequencer_registers: SequencerRegisters, + graphics_controller_registers: GraphicsControllerRegisters, + attribute_controller_registers: AttributeControllerRegisters, + crtc_controller_registers: CrtcControllerRegisters, + most_recent_video_mode: Option, +} + +impl Vga { + fn new() -> Vga { + Vga { + general_registers: GeneralRegisters::new(), + sequencer_registers: SequencerRegisters::new(), + graphics_controller_registers: GraphicsControllerRegisters::new(), + attribute_controller_registers: AttributeControllerRegisters::new(), + crtc_controller_registers: CrtcControllerRegisters::new(), + most_recent_video_mode: None, + } + } + + /// Sets the vga graphics card to the given `VideoMode`. + pub fn set_video_mode(&mut self, video_mode: VideoMode) { + match video_mode { + VideoMode::Mode40x25 => self.set_video_mode_40x25(), + VideoMode::Mode40x50 => self.set_video_mode_40x50(), + VideoMode::Mode80x25 => self.set_video_mode_80x25(), + VideoMode::Mode640x480x16 => self.set_video_mode_640x480x16(), + } + } + + /// Gets the `FrameBuffer` address as specified by the + /// `Miscellaneous Output Register`. + pub fn get_frame_buffer(&mut self) -> FrameBuffer { + let miscellaneous_graphics = self + .graphics_controller_registers + .read(GraphicsControllerIndex::Miscellaneous); + let memory_map_mode = (miscellaneous_graphics >> 0x2) & 0x3; + FrameBuffer::from(memory_map_mode) + } + + /// Returns the most recent video mode, or `None` if no + /// video mode has been set yet. + pub fn get_most_recent_video_mode(&self) -> Option { + self.most_recent_video_mode + } + + /// `I/O Address Select` Bit 0 `(value & 0x1)` of MSR selects 3Bxh or 3Dxh as the I/O address for the CRT Controller + /// registers, the Feature Control Register (FCR), and Input Status Register 1 (ST01). Presently + /// ignored (whole range is claimed), but will "ignore" 3Bx for color configuration or 3Dx for + /// monochrome. + /// Note that it is typical in AGP chipsets to shadow this bit and properly steer I/O cycles to the + /// proper bus for operation where a MDA exists on another bus such as ISA. + /// + /// 0 = Select 3Bxh I/O address `(EmulationMode::Mda)` + /// + /// 1 = Select 3Dxh I/O address `(EmulationMode:Cga)` + fn get_emulation_mode(&mut self) -> EmulationMode { + EmulationMode::from(self.general_registers.read_msr() & 0x1) + } + + fn load_font(&mut self, vga_font: &VgaFont) { + // Save registers + let ( + plane_mask, + sequencer_memory_mode, + read_plane_select, + graphics_mode, + miscellaneous_graphics, + ) = self.save_font_registers(); + + // Switch to flat addressing + self.sequencer_registers + .write(SequencerIndex::MemoryMode, sequencer_memory_mode | 0x04); + + // Disable Even/Odd addressing + self.graphics_controller_registers + .write(GraphicsControllerIndex::GraphicsMode, graphics_mode & !0x10); + self.graphics_controller_registers.write( + GraphicsControllerIndex::Miscellaneous, + miscellaneous_graphics & !0x02, + ); + + // Write font to plane + self.set_plane(Plane::Plane2); + + let frame_buffer = u32::from(self.get_frame_buffer()) as *mut u8; + + for character in 0..vga_font.characters { + for row in 0..vga_font.character_height { + let offset = (character * 32) + row; + let font_offset = (character * vga_font.character_height) + row; + unsafe { + frame_buffer + .offset(offset as isize) + .write_volatile(vga_font.font_data[font_offset as usize]); + } + } + } + + self.restore_font_registers( + plane_mask, + sequencer_memory_mode, + read_plane_select, + graphics_mode, + miscellaneous_graphics, + ); + } + + fn restore_font_registers( + &mut self, + plane_mask: u8, + sequencer_memory_mode: u8, + read_plane_select: u8, + graphics_mode: u8, + miscellaneous_graphics: u8, + ) { + self.sequencer_registers + .write(SequencerIndex::PlaneMask, plane_mask); + self.sequencer_registers + .write(SequencerIndex::MemoryMode, sequencer_memory_mode); + self.graphics_controller_registers + .write(GraphicsControllerIndex::ReadPlaneSelect, read_plane_select); + self.graphics_controller_registers + .write(GraphicsControllerIndex::GraphicsMode, graphics_mode); + self.graphics_controller_registers.write( + GraphicsControllerIndex::Miscellaneous, + miscellaneous_graphics, + ); + } + + fn save_font_registers(&mut self) -> (u8, u8, u8, u8, u8) { + ( + self.sequencer_registers.read(SequencerIndex::PlaneMask), + self.sequencer_registers.read(SequencerIndex::MemoryMode), + self.graphics_controller_registers + .read(GraphicsControllerIndex::ReadPlaneSelect), + self.graphics_controller_registers + .read(GraphicsControllerIndex::GraphicsMode), + self.graphics_controller_registers + .read(GraphicsControllerIndex::Miscellaneous), + ) + } + + /// Turns on the given `Plane` in the vga graphics card. + pub fn set_plane(&mut self, plane: Plane) { + let mut plane = u8::from(plane); + + plane &= 0x3; + + self.graphics_controller_registers + .write(GraphicsControllerIndex::ReadPlaneSelect, plane); + self.sequencer_registers + .write(SequencerIndex::PlaneMask, 0x1 << plane); + } + + fn set_registers(&mut self, configuration: &VgaConfiguration) { + let emulation_mode = self.get_emulation_mode(); + + // Set miscellaneous output + self.general_registers + .write_msr(configuration.miscellaneous_output); + + // Set the sequencer registers. + for (index, value) in configuration.sequencer_registers { + self.sequencer_registers.write(*index, *value); + } + + // Unlock the crtc registers. + self.unlock_crtc_registers(emulation_mode); + + // Set the crtc registers. + for (index, value) in configuration.crtc_controller_registers { + self.crtc_controller_registers + .write(emulation_mode, *index, *value); + } + + // Set the grx registers. + for (index, value) in configuration.graphics_controller_registers { + self.graphics_controller_registers.write(*index, *value); + } + + // Blank the screen so the palette registers are unlocked. + self.attribute_controller_registers + .blank_screen(emulation_mode); + + // Set the arx registers. + for (index, value) in configuration.attribute_controller_registers { + self.attribute_controller_registers + .write(emulation_mode, *index, *value); + } + + // Unblank the screen so the palette registers are locked. + self.attribute_controller_registers + .unblank_screen(emulation_mode); + } + + /// Sets the video card to Mode 40x25. + fn set_video_mode_40x25(&mut self) { + self.set_registers(&MODE_40X25_CONFIGURATION); + self.load_font(&TEXT_8X16_FONT); + self.most_recent_video_mode = Some(VideoMode::Mode40x25); + } + + /// Sets the video card to Mode 40x50. + fn set_video_mode_40x50(&mut self) { + self.set_registers(&MODE_40X50_CONFIGURATION); + self.load_font(&TEXT_8X8_FONT); + self.most_recent_video_mode = Some(VideoMode::Mode40x50); + } + + /// Sets the video card to Mode 80x25. + fn set_video_mode_80x25(&mut self) { + self.set_registers(&MODE_80X25_CONFIGURATION); + self.load_font(&TEXT_8X16_FONT); + self.most_recent_video_mode = Some(VideoMode::Mode80x25); + } + + /// Sets the video card to Mode 640x480x16. + fn set_video_mode_640x480x16(&mut self) { + self.set_registers(&MODE_640X480X16_CONFIGURATION); + self.most_recent_video_mode = Some(VideoMode::Mode640x480x16); + } + + /// Unlocks the CRTC registers by setting bit 7 to 0 `(value & 0x7F)`. + /// + /// `Protect Registers [0:7]`: Note that the ability to write to Bit 4 of the Overflow Register (CR07) + /// is not affected by this bit (i.e., bit 4 of the Overflow Register is always writeable). + /// + /// 0 = Enable writes to registers `CR[00:07]` + /// + /// 1 = Disable writes to registers `CR[00:07]` + fn unlock_crtc_registers(&mut self, emulation_mode: EmulationMode) { + // Setting bit 7 to 1 used to be required for `VGA`, but says it's + // ignored in modern hardware. Setting it to 1 just to be safe for older + // hardware. More information can be found here + // https://01.org/sites/default/files/documentation/intel-gfx-prm-osrc-hsw-display.pdf + // under `CR03 - Horizontal Blanking End Register`. + let horizontal_blanking_end = self + .crtc_controller_registers + .read(emulation_mode, CrtcControllerIndex::HorizontalBlankingEnd); + self.crtc_controller_registers.write( + emulation_mode, + CrtcControllerIndex::HorizontalBlankingEnd, + horizontal_blanking_end | 0x80, + ); + + let vertical_sync_end = self + .crtc_controller_registers + .read(emulation_mode, CrtcControllerIndex::VerticalSyncEnd); + self.crtc_controller_registers.write( + emulation_mode, + CrtcControllerIndex::VerticalSyncEnd, + vertical_sync_end & 0x7F, + ); + } +} diff --git a/src/vga_colors.rs b/src/vga_colors.rs new file mode 100644 index 0000000..3654018 --- /dev/null +++ b/src/vga_colors.rs @@ -0,0 +1,52 @@ +//! Common color structures used in vga. + +/// Represents a 16 bit color used for vga display. +#[derive(Debug, Clone, Copy)] +#[repr(u8)] +pub enum Color16Bit { + /// Represents the color `Black (0x0)`. + Black = 0x0, + /// Represents the color `Blue (0x1)`. + Blue = 0x1, + /// Represents the color `Green (0x2)`. + Green = 0x2, + /// Represents the color `Cyan (0x3)`. + Cyan = 0x3, + /// Represents the color `Red (0x4)`. + Red = 0x4, + /// Represents the color `Magenta (0x5)`. + Magenta = 0x5, + /// Represents the color `Brown (0x6)`. + Brown = 0x6, + /// Represents the color `LightGrey (0x7)`. + LightGrey = 0x7, + /// Represents the color `DarkGrey (0x8)`. + DarkGrey = 0x8, + /// Represents the color `LightBlue (0x9)`. + LightBlue = 0x9, + /// Represents the color `LightGreen (0xA)`. + LightGreen = 0xA, + /// Represents the color `LightCyan (0xB)`. + LightCyan = 0xB, + /// Represents the color `LightRed (0xC)`. + LightRed = 0xC, + /// Represents the color `Pink (0xD)`. + Pink = 0xD, + /// Represents the color `Yellow (0xE)`. + Yellow = 0xE, + /// Represents the color `White (0xF)`. + White = 0xF, +} + +/// Represents a color for vga text modes. +#[derive(Debug, Copy, Clone)] +#[repr(transparent)] +pub struct TextModeColor(u8); + +impl TextModeColor { + /// Returns a new `TextModeColor` given the specified `foreground` + /// and `background` color. + pub const fn new(foreground: Color16Bit, background: Color16Bit) -> TextModeColor { + TextModeColor((background as u8) << 4 | (foreground as u8)) + } +} diff --git a/src/vga_configurations.rs b/src/vga_configurations.rs new file mode 100644 index 0000000..fbefcd8 --- /dev/null +++ b/src/vga_configurations.rs @@ -0,0 +1,310 @@ +use super::vga_registers::{ + AttributeControllerIndex, CrtcControllerIndex, GraphicsControllerIndex, SequencerIndex, +}; + +/// Represents a set of vga registers for a given mode. +#[derive(Debug)] +pub struct VgaConfiguration { + pub miscellaneous_output: u8, + pub sequencer_registers: &'static [(SequencerIndex, u8)], + pub crtc_controller_registers: &'static [(CrtcControllerIndex, u8)], + pub graphics_controller_registers: &'static [(GraphicsControllerIndex, u8)], + pub attribute_controller_registers: &'static [(AttributeControllerIndex, u8)], +} + +/// Register values for Vga mode 40x25 Text. +pub const MODE_40X25_CONFIGURATION: VgaConfiguration = VgaConfiguration { + // Configuration values acquired from https://www.singlix.com/trdos/archive/vga/Graphics%20in%20pmode.pdf + miscellaneous_output: 0x67, + sequencer_registers: &[ + (SequencerIndex::SequencerReset, 0x03), + (SequencerIndex::ClockingMode, 0x08), + (SequencerIndex::PlaneMask, 0x03), + (SequencerIndex::CharacterFont, 0x00), + (SequencerIndex::MemoryMode, 0x02), + ], + crtc_controller_registers: &[ + (CrtcControllerIndex::HorizontalTotal, 0x2D), + (CrtcControllerIndex::HorizontalDisplayEnableEnd, 0x27), + (CrtcControllerIndex::HorizontalBlankingStart, 0x28), + (CrtcControllerIndex::HorizontalBlankingEnd, 0x90), + (CrtcControllerIndex::HorizontalSyncStart, 0x2B), + (CrtcControllerIndex::HorizontalSyncEnd, 0xA0), + (CrtcControllerIndex::VeritcalTotal, 0xBF), + (CrtcControllerIndex::Overflow, 0x1F), + (CrtcControllerIndex::PresetRowScan, 0x00), + (CrtcControllerIndex::MaximumScanLine, 0x4F), + (CrtcControllerIndex::TextCursorStart, 0x0A), + (CrtcControllerIndex::TextCursorEnd, 0x20), + (CrtcControllerIndex::StartAddressHigh, 0x00), + (CrtcControllerIndex::StartAddressLow, 0x00), + (CrtcControllerIndex::TextCursorLocationHigh, 0x00), + (CrtcControllerIndex::TextCursorLocationLow, 0xA0), + (CrtcControllerIndex::VerticalSyncStart, 0x9C), + (CrtcControllerIndex::VerticalSyncEnd, 0x8E), + (CrtcControllerIndex::VerticalDisplayEnableEnd, 0x8F), + (CrtcControllerIndex::Offset, 0x14), + (CrtcControllerIndex::UnderlineLocationRegister, 0x1F), + (CrtcControllerIndex::VerticalBlankingStart, 0x96), + (CrtcControllerIndex::VerticalBlankingEnd, 0xB9), + (CrtcControllerIndex::ModeControl, 0xA3), + (CrtcControllerIndex::LineCompare, 0xFF), + ], + graphics_controller_registers: &[ + (GraphicsControllerIndex::SetReset, 0x00), + (GraphicsControllerIndex::EnableSetReset, 0x00), + (GraphicsControllerIndex::ColorCompare, 0x00), + (GraphicsControllerIndex::DataRotate, 0x00), + (GraphicsControllerIndex::ReadPlaneSelect, 0x00), + (GraphicsControllerIndex::GraphicsMode, 0x10), + (GraphicsControllerIndex::Miscellaneous, 0x0E), + (GraphicsControllerIndex::ColorDontCare, 0x00), + (GraphicsControllerIndex::BitMask, 0xFF), + ], + attribute_controller_registers: &[ + (AttributeControllerIndex::PaletteRegister0, 0x00), + (AttributeControllerIndex::PaletteRegister1, 0x01), + (AttributeControllerIndex::PaletteRegister2, 0x02), + (AttributeControllerIndex::PaletteRegister3, 0x03), + (AttributeControllerIndex::PaletteRegister4, 0x04), + (AttributeControllerIndex::PaletteRegister5, 0x05), + (AttributeControllerIndex::PaletteRegister6, 0x14), + (AttributeControllerIndex::PaletteRegister7, 0x07), + (AttributeControllerIndex::PaletteRegister8, 0x38), + (AttributeControllerIndex::PaletteRegister9, 0x39), + (AttributeControllerIndex::PaletteRegisterA, 0x3A), + (AttributeControllerIndex::PaletteRegisterB, 0x3B), + (AttributeControllerIndex::PaletteRegisterC, 0x3C), + (AttributeControllerIndex::PaletteRegisterD, 0x3D), + (AttributeControllerIndex::PaletteRegisterE, 0x3E), + (AttributeControllerIndex::PaletteRegisterF, 0x3F), + (AttributeControllerIndex::ModeControl, 0x0C), + (AttributeControllerIndex::OverscanColor, 0x00), + (AttributeControllerIndex::MemoryPlaneEnable, 0x0F), + (AttributeControllerIndex::HorizontalPixelPanning, 0x08), + (AttributeControllerIndex::ColorSelect, 0x00), + ], +}; + +/// Register values for Vga mode 40x50 Text. +pub const MODE_40X50_CONFIGURATION: VgaConfiguration = VgaConfiguration { + // Configuration values acquired from https://www.singlix.com/trdos/archive/vga/Graphics%20in%20pmode.pdf + miscellaneous_output: 0x67, + sequencer_registers: &[ + (SequencerIndex::SequencerReset, 0x03), + (SequencerIndex::ClockingMode, 0x08), + (SequencerIndex::PlaneMask, 0x03), + (SequencerIndex::CharacterFont, 0x00), + (SequencerIndex::MemoryMode, 0x02), + ], + crtc_controller_registers: &[ + (CrtcControllerIndex::HorizontalTotal, 0x2D), + (CrtcControllerIndex::HorizontalDisplayEnableEnd, 0x27), + (CrtcControllerIndex::HorizontalBlankingStart, 0x28), + (CrtcControllerIndex::HorizontalBlankingEnd, 0x90), + (CrtcControllerIndex::HorizontalSyncStart, 0x2B), + (CrtcControllerIndex::HorizontalSyncEnd, 0xA0), + (CrtcControllerIndex::VeritcalTotal, 0xBF), + (CrtcControllerIndex::Overflow, 0x1F), + (CrtcControllerIndex::PresetRowScan, 0x00), + (CrtcControllerIndex::MaximumScanLine, 0x47), + (CrtcControllerIndex::TextCursorStart, 0x0A), + (CrtcControllerIndex::TextCursorEnd, 0x20), + (CrtcControllerIndex::StartAddressHigh, 0x00), + (CrtcControllerIndex::StartAddressLow, 0x00), + (CrtcControllerIndex::TextCursorLocationHigh, 0x04), + (CrtcControllerIndex::TextCursorLocationLow, 0x60), + (CrtcControllerIndex::VerticalSyncStart, 0x9C), + (CrtcControllerIndex::VerticalSyncEnd, 0x8E), + (CrtcControllerIndex::VerticalDisplayEnableEnd, 0x8F), + (CrtcControllerIndex::Offset, 0x14), + (CrtcControllerIndex::UnderlineLocationRegister, 0x1F), + (CrtcControllerIndex::VerticalBlankingStart, 0x96), + (CrtcControllerIndex::VerticalBlankingEnd, 0xB9), + (CrtcControllerIndex::ModeControl, 0xA3), + (CrtcControllerIndex::LineCompare, 0xFF), + ], + graphics_controller_registers: &[ + (GraphicsControllerIndex::SetReset, 0x00), + (GraphicsControllerIndex::EnableSetReset, 0x00), + (GraphicsControllerIndex::ColorCompare, 0x00), + (GraphicsControllerIndex::DataRotate, 0x00), + (GraphicsControllerIndex::ReadPlaneSelect, 0x00), + (GraphicsControllerIndex::GraphicsMode, 0x10), + (GraphicsControllerIndex::Miscellaneous, 0x0E), + (GraphicsControllerIndex::ColorDontCare, 0x00), + (GraphicsControllerIndex::BitMask, 0xFF), + ], + attribute_controller_registers: &[ + (AttributeControllerIndex::PaletteRegister0, 0x00), + (AttributeControllerIndex::PaletteRegister1, 0x01), + (AttributeControllerIndex::PaletteRegister2, 0x02), + (AttributeControllerIndex::PaletteRegister3, 0x03), + (AttributeControllerIndex::PaletteRegister4, 0x04), + (AttributeControllerIndex::PaletteRegister5, 0x05), + (AttributeControllerIndex::PaletteRegister6, 0x14), + (AttributeControllerIndex::PaletteRegister7, 0x07), + (AttributeControllerIndex::PaletteRegister8, 0x38), + (AttributeControllerIndex::PaletteRegister9, 0x39), + (AttributeControllerIndex::PaletteRegisterA, 0x3A), + (AttributeControllerIndex::PaletteRegisterB, 0x3B), + (AttributeControllerIndex::PaletteRegisterC, 0x3C), + (AttributeControllerIndex::PaletteRegisterD, 0x3D), + (AttributeControllerIndex::PaletteRegisterE, 0x3E), + (AttributeControllerIndex::PaletteRegisterF, 0x3F), + (AttributeControllerIndex::ModeControl, 0x0C), + (AttributeControllerIndex::OverscanColor, 0x00), + (AttributeControllerIndex::MemoryPlaneEnable, 0x0F), + (AttributeControllerIndex::HorizontalPixelPanning, 0x08), + (AttributeControllerIndex::ColorSelect, 0x00), + ], +}; + +/// Register values for Vga mode 80x25 Text. +pub const MODE_80X25_CONFIGURATION: VgaConfiguration = VgaConfiguration { + // Configuration values acquired from https://www.singlix.com/trdos/archive/vga/Graphics%20in%20pmode.pdf + miscellaneous_output: 0x67, + sequencer_registers: &[ + (SequencerIndex::SequencerReset, 0x03), + (SequencerIndex::ClockingMode, 0x00), + (SequencerIndex::PlaneMask, 0x03), + (SequencerIndex::CharacterFont, 0x00), + (SequencerIndex::MemoryMode, 0x02), + ], + crtc_controller_registers: &[ + (CrtcControllerIndex::HorizontalTotal, 0x5F), + (CrtcControllerIndex::HorizontalDisplayEnableEnd, 0x4F), + (CrtcControllerIndex::HorizontalBlankingStart, 0x50), + (CrtcControllerIndex::HorizontalBlankingEnd, 0x82), + (CrtcControllerIndex::HorizontalSyncStart, 0x55), + (CrtcControllerIndex::HorizontalSyncEnd, 0x81), + (CrtcControllerIndex::VeritcalTotal, 0xBF), + (CrtcControllerIndex::Overflow, 0x1F), + (CrtcControllerIndex::PresetRowScan, 0x00), + (CrtcControllerIndex::MaximumScanLine, 0x4F), + (CrtcControllerIndex::TextCursorStart, 0x0D), + (CrtcControllerIndex::TextCursorEnd, 0x0E), + (CrtcControllerIndex::StartAddressHigh, 0x00), + (CrtcControllerIndex::StartAddressLow, 0x00), + (CrtcControllerIndex::TextCursorLocationHigh, 0x00), + (CrtcControllerIndex::TextCursorLocationLow, 0x50), + (CrtcControllerIndex::VerticalSyncStart, 0x9C), + (CrtcControllerIndex::VerticalSyncEnd, 0x0E), + (CrtcControllerIndex::VerticalDisplayEnableEnd, 0x8F), + (CrtcControllerIndex::Offset, 0x28), + (CrtcControllerIndex::UnderlineLocationRegister, 0x1F), + (CrtcControllerIndex::VerticalBlankingStart, 0x96), + (CrtcControllerIndex::VerticalBlankingEnd, 0xB9), + (CrtcControllerIndex::ModeControl, 0xA3), + (CrtcControllerIndex::LineCompare, 0xFF), + ], + graphics_controller_registers: &[ + (GraphicsControllerIndex::SetReset, 0x00), + (GraphicsControllerIndex::EnableSetReset, 0x00), + (GraphicsControllerIndex::ColorCompare, 0x00), + (GraphicsControllerIndex::DataRotate, 0x00), + (GraphicsControllerIndex::ReadPlaneSelect, 0x00), + (GraphicsControllerIndex::GraphicsMode, 0x10), + (GraphicsControllerIndex::Miscellaneous, 0x0E), + (GraphicsControllerIndex::ColorDontCare, 0x00), + (GraphicsControllerIndex::BitMask, 0xFF), + ], + attribute_controller_registers: &[ + (AttributeControllerIndex::PaletteRegister0, 0x00), + (AttributeControllerIndex::PaletteRegister1, 0x01), + (AttributeControllerIndex::PaletteRegister2, 0x02), + (AttributeControllerIndex::PaletteRegister3, 0x03), + (AttributeControllerIndex::PaletteRegister4, 0x04), + (AttributeControllerIndex::PaletteRegister5, 0x05), + (AttributeControllerIndex::PaletteRegister6, 0x14), + (AttributeControllerIndex::PaletteRegister7, 0x07), + (AttributeControllerIndex::PaletteRegister8, 0x38), + (AttributeControllerIndex::PaletteRegister9, 0x39), + (AttributeControllerIndex::PaletteRegisterA, 0x3A), + (AttributeControllerIndex::PaletteRegisterB, 0x3B), + (AttributeControllerIndex::PaletteRegisterC, 0x3C), + (AttributeControllerIndex::PaletteRegisterD, 0x3D), + (AttributeControllerIndex::PaletteRegisterE, 0x3E), + (AttributeControllerIndex::PaletteRegisterF, 0x3F), + (AttributeControllerIndex::ModeControl, 0x0C), + (AttributeControllerIndex::OverscanColor, 0x00), + (AttributeControllerIndex::MemoryPlaneEnable, 0x0F), + (AttributeControllerIndex::HorizontalPixelPanning, 0x08), + (AttributeControllerIndex::ColorSelect, 0x00), + ], +}; + +/// Register values for Vga mode 640x480x16 Graphics. +pub const MODE_640X480X16_CONFIGURATION: VgaConfiguration = VgaConfiguration { + // Configuration values acquired from https://www.singlix.com/trdos/archive/vga/Graphics%20in%20pmode.pdf + // and https://forum.osdev.org/viewtopic.php?f=1&t=20137&hilit=640x480x16 + miscellaneous_output: 0xE3, + sequencer_registers: &[ + (SequencerIndex::SequencerReset, 0x03), + (SequencerIndex::ClockingMode, 0x01), + (SequencerIndex::PlaneMask, 0x08), + (SequencerIndex::CharacterFont, 0x00), + (SequencerIndex::MemoryMode, 0x06), + ], + crtc_controller_registers: &[ + (CrtcControllerIndex::HorizontalTotal, 0x5F), + (CrtcControllerIndex::HorizontalDisplayEnableEnd, 0x4F), + (CrtcControllerIndex::HorizontalBlankingStart, 0x50), + (CrtcControllerIndex::HorizontalBlankingEnd, 0x82), + (CrtcControllerIndex::HorizontalSyncStart, 0x54), + (CrtcControllerIndex::HorizontalSyncEnd, 0x80), + (CrtcControllerIndex::VeritcalTotal, 0x0B), + (CrtcControllerIndex::Overflow, 0x3E), + (CrtcControllerIndex::PresetRowScan, 0x00), + (CrtcControllerIndex::MaximumScanLine, 0x40), + (CrtcControllerIndex::TextCursorStart, 0x00), + (CrtcControllerIndex::TextCursorEnd, 0x00), + (CrtcControllerIndex::StartAddressHigh, 0x00), + (CrtcControllerIndex::StartAddressLow, 0x00), + (CrtcControllerIndex::TextCursorLocationHigh, 0x00), + (CrtcControllerIndex::TextCursorLocationLow, 0x00), + (CrtcControllerIndex::VerticalSyncStart, 0xEA), + (CrtcControllerIndex::VerticalSyncEnd, 0x0C), + (CrtcControllerIndex::VerticalDisplayEnableEnd, 0xDF), + (CrtcControllerIndex::Offset, 0x28), + (CrtcControllerIndex::UnderlineLocationRegister, 0x00), + (CrtcControllerIndex::VerticalBlankingStart, 0xE7), + (CrtcControllerIndex::VerticalBlankingEnd, 0x04), + (CrtcControllerIndex::ModeControl, 0xE3), + (CrtcControllerIndex::LineCompare, 0xFF), + ], + graphics_controller_registers: &[ + (GraphicsControllerIndex::SetReset, 0x00), + (GraphicsControllerIndex::EnableSetReset, 0x00), + (GraphicsControllerIndex::ColorCompare, 0x00), + (GraphicsControllerIndex::DataRotate, 0x00), + (GraphicsControllerIndex::ReadPlaneSelect, 0x03), + (GraphicsControllerIndex::GraphicsMode, 0x00), + (GraphicsControllerIndex::Miscellaneous, 0x05), + (GraphicsControllerIndex::ColorDontCare, 0x0F), + (GraphicsControllerIndex::BitMask, 0xFF), + ], + attribute_controller_registers: &[ + (AttributeControllerIndex::PaletteRegister0, 0x00), + (AttributeControllerIndex::PaletteRegister1, 0x01), + (AttributeControllerIndex::PaletteRegister2, 0x02), + (AttributeControllerIndex::PaletteRegister3, 0x03), + (AttributeControllerIndex::PaletteRegister4, 0x04), + (AttributeControllerIndex::PaletteRegister5, 0x05), + (AttributeControllerIndex::PaletteRegister6, 0x14), + (AttributeControllerIndex::PaletteRegister7, 0x07), + (AttributeControllerIndex::PaletteRegister8, 0x38), + (AttributeControllerIndex::PaletteRegister9, 0x39), + (AttributeControllerIndex::PaletteRegisterA, 0x3A), + (AttributeControllerIndex::PaletteRegisterB, 0x3B), + (AttributeControllerIndex::PaletteRegisterC, 0x3C), + (AttributeControllerIndex::PaletteRegisterD, 0x3D), + (AttributeControllerIndex::PaletteRegisterE, 0x3E), + (AttributeControllerIndex::PaletteRegisterF, 0x3F), + (AttributeControllerIndex::ModeControl, 0x01), + (AttributeControllerIndex::OverscanColor, 0x00), + (AttributeControllerIndex::MemoryPlaneEnable, 0x0F), + (AttributeControllerIndex::HorizontalPixelPanning, 0x00), + (AttributeControllerIndex::ColorSelect, 0x00), + ], +}; diff --git a/src/vga_fonts.rs b/src/vga_fonts.rs new file mode 100644 index 0000000..a3b1ea4 --- /dev/null +++ b/src/vga_fonts.rs @@ -0,0 +1,435 @@ +/// Represents a font to be used for text mode. +pub struct VgaFont { + pub characters: u16, + pub character_height: u16, + pub font_data: &'static [u8], +} + +/// Standard 8x8 character font. +pub const TEXT_8X8_FONT: VgaFont = VgaFont { + characters: 256, + character_height: 8, + // Font data acquired from https://www.singlix.com/trdos/archive/vga/Graphics%20in%20pmode.pdf + font_data: &[ + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7E, 0x81, 0xA5, 0x81, 0xBD, 0x99, 0x81, + 0x7E, 0x7E, 0xFF, 0xDB, 0xFF, 0xC3, 0xE7, 0xFF, 0x7E, 0x6C, 0xFE, 0xFE, 0xFE, 0x7C, 0x38, + 0x10, 0x00, 0x10, 0x38, 0x7C, 0xFE, 0x7C, 0x38, 0x10, 0x00, 0x38, 0x7C, 0x38, 0xFE, 0xFE, + 0x92, 0x10, 0x7C, 0x00, 0x10, 0x38, 0x7C, 0xFE, 0x7C, 0x38, 0x7C, 0x00, 0x00, 0x18, 0x3C, + 0x3C, 0x18, 0x00, 0x00, 0xFF, 0xFF, 0xE7, 0xC3, 0xC3, 0xE7, 0xFF, 0xFF, 0x00, 0x3C, 0x66, + 0x42, 0x42, 0x66, 0x3C, 0x00, 0xFF, 0xC3, 0x99, 0xBD, 0xBD, 0x99, 0xC3, 0xFF, 0x0F, 0x07, + 0x0F, 0x7D, 0xCC, 0xCC, 0xCC, 0x78, 0x3C, 0x66, 0x66, 0x66, 0x3C, 0x18, 0x7E, 0x18, 0x3F, + 0x33, 0x3F, 0x30, 0x30, 0x70, 0xF0, 0xE0, 0x7F, 0x63, 0x7F, 0x63, 0x63, 0x67, 0xE6, 0xC0, + 0x99, 0x5A, 0x3C, 0xE7, 0xE7, 0x3C, 0x5A, 0x99, 0x80, 0xE0, 0xF8, 0xFE, 0xF8, 0xE0, 0x80, + 0x00, 0x02, 0x0E, 0x3E, 0xFE, 0x3E, 0x0E, 0x02, 0x00, 0x18, 0x3C, 0x7E, 0x18, 0x18, 0x7E, + 0x3C, 0x18, 0x66, 0x66, 0x66, 0x66, 0x66, 0x00, 0x66, 0x00, 0x7F, 0xDB, 0xDB, 0x7B, 0x1B, + 0x1B, 0x1B, 0x00, 0x3E, 0x63, 0x38, 0x6C, 0x6C, 0x38, 0x86, 0xFC, 0x00, 0x00, 0x00, 0x00, + 0x7E, 0x7E, 0x7E, 0x00, 0x18, 0x3C, 0x7E, 0x18, 0x7E, 0x3C, 0x18, 0xFF, 0x18, 0x3C, 0x7E, + 0x18, 0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x18, 0x18, 0x7E, 0x3C, 0x18, 0x00, 0x00, 0x18, + 0x0C, 0xFE, 0x0C, 0x18, 0x00, 0x00, 0x00, 0x30, 0x60, 0xFE, 0x60, 0x30, 0x00, 0x00, 0x00, + 0x00, 0xC0, 0xC0, 0xC0, 0xFE, 0x00, 0x00, 0x00, 0x24, 0x66, 0xFF, 0x66, 0x24, 0x00, 0x00, + 0x00, 0x18, 0x3C, 0x7E, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x7E, 0x3C, 0x18, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x3C, 0x3C, 0x18, 0x18, 0x00, + 0x18, 0x00, 0x6C, 0x6C, 0x6C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x6C, 0x6C, 0xFE, 0x6C, 0xFE, + 0x6C, 0x6C, 0x00, 0x18, 0x7E, 0xC0, 0x7C, 0x06, 0xFC, 0x18, 0x00, 0x00, 0xC6, 0xCC, 0x18, + 0x30, 0x66, 0xC6, 0x00, 0x38, 0x6C, 0x38, 0x76, 0xDC, 0xCC, 0x76, 0x00, 0x30, 0x30, 0x60, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x30, 0x60, 0x60, 0x60, 0x30, 0x18, 0x00, 0x60, 0x30, + 0x18, 0x18, 0x18, 0x30, 0x60, 0x00, 0x00, 0x66, 0x3C, 0xFF, 0x3C, 0x66, 0x00, 0x00, 0x00, + 0x18, 0x18, 0x7E, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x30, + 0x00, 0x00, 0x00, 0x7E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 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ST01_READ_MDA_ADDRESS: u16 = 0x3BA; +const FCR_READ_ADDRESS: u16 = 0x3CA; +const FCR_CGA_WRITE_ADDRESS: u16 = 0x3DA; +const FCR_MDA_WRITE_ADDRESS: u16 = 0x3BA; +const MSR_READ_ADDRESS: u16 = 0x3CC; +const MSR_WRITE_ADDRESS: u16 = 0x3C2; + +const SRX_INDEX_ADDRESS: u16 = 0x3C4; +const SRX_DATA_ADDRESS: u16 = 0x3C5; + +const GRX_INDEX_ADDRESS: u16 = 0x3CE; +const GRX_DATA_ADDRESS: u16 = 0x3CF; + +const ARX_INDEX_ADDRESS: u16 = 0x3C0; +const ARX_DATA_ADDRESS: u16 = 0x3C1; + +const CRX_INDEX_CGA_ADDRESS: u16 = 0x3D4; +const CRX_INDEX_MDA_ADDRESS: u16 = 0x3B4; +const CRX_DATA_CGA_ADDRESS: u16 = 0x3D5; +const CRX_DATA_MDA_ADDRESS: u16 = 0x3B5; + +#[derive(Debug, Copy, Clone)] +#[repr(u8)] +pub enum EmulationMode { + Mda = 0x0, + Cga = 0x1, +} + +impl From for EmulationMode { + fn from(value: u8) -> EmulationMode { + match value { + 0x0 => EmulationMode::Mda, + 0x1 => EmulationMode::Cga, + _ => panic!("{} is an invalid emulation mode", value), + } + } +} + +#[derive(Debug, Clone, Copy)] +#[repr(u8)] +pub enum SequencerIndex { + SequencerReset = 0x0, + ClockingMode = 0x1, + PlaneMask = 0x2, + CharacterFont = 0x3, + MemoryMode = 0x4, + CounterReset = 0x7, +} + +impl From for u8 { + fn from(value: SequencerIndex) -> u8 { + value as u8 + } +} + +#[derive(Debug, Copy, Clone)] +#[repr(u8)] +pub enum GraphicsControllerIndex { + SetReset = 0x0, + EnableSetReset = 0x1, + ColorCompare = 0x2, + DataRotate = 0x3, + ReadPlaneSelect = 0x4, + GraphicsMode = 0x5, + Miscellaneous = 0x6, + ColorDontCare = 0x7, + BitMask = 0x8, + AddressMapping = 0x10, + PageSelector = 0x11, + SoftwareFlags = 0x18, +} + +impl From for u8 { + fn from(value: GraphicsControllerIndex) -> u8 { + value as u8 + } +} + +#[derive(Debug, Copy, Clone)] +#[repr(u8)] +pub enum AttributeControllerIndex { + PaletteRegister0 = 0x00, + PaletteRegister1 = 0x01, + PaletteRegister2 = 0x02, + PaletteRegister3 = 0x03, + PaletteRegister4 = 0x04, + PaletteRegister5 = 0x05, + PaletteRegister6 = 0x06, + PaletteRegister7 = 0x07, + PaletteRegister8 = 0x08, + PaletteRegister9 = 0x09, + PaletteRegisterA = 0x0A, + PaletteRegisterB = 0x0B, + PaletteRegisterC = 0x0C, + PaletteRegisterD = 0x0D, + PaletteRegisterE = 0x0E, + PaletteRegisterF = 0x0F, + ModeControl = 0x10, + OverscanColor = 0x11, + MemoryPlaneEnable = 0x12, + HorizontalPixelPanning = 0x13, + ColorSelect = 0x14, +} + +impl From for u8 { + fn from(value: AttributeControllerIndex) -> u8 { + value as u8 + } +} + +#[derive(Debug, Copy, Clone)] +#[repr(u8)] +pub enum CrtcControllerIndex { + HorizontalTotal = 0x00, + HorizontalDisplayEnableEnd = 0x01, + HorizontalBlankingStart = 0x02, + HorizontalBlankingEnd = 0x03, + HorizontalSyncStart = 0x04, + HorizontalSyncEnd = 0x05, + VeritcalTotal = 0x06, + Overflow = 0x07, + PresetRowScan = 0x08, + MaximumScanLine = 0x09, + TextCursorStart = 0x0A, + TextCursorEnd = 0x0B, + StartAddressHigh = 0x0C, + StartAddressLow = 0x0D, + TextCursorLocationHigh = 0x0E, + TextCursorLocationLow = 0x0F, + VerticalSyncStart = 0x10, + VerticalSyncEnd = 0x11, + VerticalDisplayEnableEnd = 0x12, + Offset = 0x13, + UnderlineLocationRegister = 0x14, + VerticalBlankingStart = 0x15, + VerticalBlankingEnd = 0x16, + ModeControl = 0x17, + LineCompare = 0x18, + MemoryReadLatchData = 0x22, + ToggleStateOfAttributeController = 0x24, +} + +impl From for u8 { + fn from(value: CrtcControllerIndex) -> u8 { + value as u8 + } +} + +#[derive(Debug)] +pub struct GeneralRegisters { + st00_read: PortReadOnly, + st01_read_cga: PortReadOnly, + st01_read_mda: PortReadOnly, + fcr_read: PortReadOnly, + fcr_write_cga: PortWriteOnly, + fcr_write_mda: PortWriteOnly, + msr_read: PortReadOnly, + msr_write: PortWriteOnly, +} + +impl GeneralRegisters { + pub fn new() -> GeneralRegisters { + GeneralRegisters { + st00_read: PortReadOnly::new(ST00_READ_ADDRESS), + st01_read_cga: PortReadOnly::new(ST01_READ_CGA_ADDRESS), + st01_read_mda: PortReadOnly::new(ST01_READ_MDA_ADDRESS), + fcr_read: PortReadOnly::new(FCR_READ_ADDRESS), + fcr_write_cga: PortWriteOnly::new(FCR_CGA_WRITE_ADDRESS), + fcr_write_mda: PortWriteOnly::new(FCR_MDA_WRITE_ADDRESS), + msr_read: PortReadOnly::new(MSR_READ_ADDRESS), + msr_write: PortWriteOnly::new(MSR_WRITE_ADDRESS), + } + } + + pub fn read_msr(&mut self) -> u8 { + unsafe { self.msr_read.read() } + } + + pub fn write_msr(&mut self, value: u8) { + unsafe { + self.msr_write.write(value); + } + } +} + +#[derive(Debug)] +pub struct SequencerRegisters { + srx_index: Port, + srx_data: Port, +} + +impl SequencerRegisters { + pub fn new() -> SequencerRegisters { + SequencerRegisters { + srx_index: Port::new(SRX_INDEX_ADDRESS), + srx_data: Port::new(SRX_DATA_ADDRESS), + } + } + + pub fn read(&mut self, index: SequencerIndex) -> u8 { + self.set_index(index); + unsafe { self.srx_data.read() } + } + + pub fn write(&mut self, index: SequencerIndex, value: u8) { + self.set_index(index); + unsafe { + self.srx_data.write(value); + } + } + + fn set_index(&mut self, index: SequencerIndex) { + unsafe { + self.srx_index.write(u8::from(index)); + } + } +} + +#[derive(Debug)] +pub struct GraphicsControllerRegisters { + grx_index: Port, + grx_data: Port, +} + +impl GraphicsControllerRegisters { + pub fn new() -> GraphicsControllerRegisters { + GraphicsControllerRegisters { + grx_index: Port::new(GRX_INDEX_ADDRESS), + grx_data: Port::new(GRX_DATA_ADDRESS), + } + } + + pub fn read(&mut self, index: GraphicsControllerIndex) -> u8 { + self.set_index(index); + unsafe { self.grx_data.read() } + } + + pub fn write(&mut self, index: GraphicsControllerIndex, value: u8) { + self.set_index(index); + unsafe { + self.grx_data.write(value); + } + } + + fn set_index(&mut self, index: GraphicsControllerIndex) { + unsafe { + self.grx_index.write(u8::from(index)); + } + } +} + +#[derive(Debug)] +pub struct AttributeControllerRegisters { + arx_index: Port, + arx_data: Port, + st01_read_cga: Port, + st01_read_mda: Port, +} + +impl AttributeControllerRegisters { + pub fn new() -> AttributeControllerRegisters { + AttributeControllerRegisters { + arx_index: Port::new(ARX_INDEX_ADDRESS), + arx_data: Port::new(ARX_DATA_ADDRESS), + st01_read_cga: Port::new(ST01_READ_CGA_ADDRESS), + st01_read_mda: Port::new(ST01_READ_MDA_ADDRESS), + } + } + + pub fn write( + &mut self, + emulation_mode: EmulationMode, + index: AttributeControllerIndex, + value: u8, + ) { + self.toggle_index(emulation_mode); + self.set_index(index); + unsafe { + self.arx_index.write(value); + } + } + + fn set_index(&mut self, index: AttributeControllerIndex) { + unsafe { + self.arx_index.write(u8::from(index)); + } + } + + fn toggle_index(&mut self, emulation_mode: EmulationMode) { + let st01_read = match emulation_mode { + EmulationMode::Cga => &mut self.st01_read_cga, + EmulationMode::Mda => &mut self.st01_read_mda, + }; + unsafe { + st01_read.read(); + } + } + + /// Video Enable. Note that In the VGA standard, this is called the "Palette Address Source" bit. + /// Clearing this bit will cause the VGA display data to become all 00 index values. For the default + /// palette, this will cause a black screen. The video timing signals continue. Another control bit will + /// turn video off and stop the data fetches. + /// + /// 0 = Disable. Attribute controller color registers (AR[00:0F]) can be accessed by the CPU. + /// + /// 1 = Enable. Attribute controller color registers (AR[00:0F]) are inaccessible by the CPU. + pub fn blank_screen(&mut self, emulation_mode: EmulationMode) { + self.toggle_index(emulation_mode); + let arx_index_value = unsafe { self.arx_index.read() }; + unsafe { + self.arx_index.write(arx_index_value & 0xDF); + } + } + + /// Video Enable. Note that In the VGA standard, this is called the "Palette Address Source" bit. + /// Clearing this bit will cause the VGA display data to become all 00 index values. For the default + /// palette, this will cause a black screen. The video timing signals continue. Another control bit will + /// turn video off and stop the data fetches. + /// + /// 0 = Disable. Attribute controller color registers (AR[00:0F]) can be accessed by the CPU. + /// + /// 1 = Enable. Attribute controller color registers (AR[00:0F]) are inaccessible by the CPU. + pub fn unblank_screen(&mut self, emulation_mode: EmulationMode) { + self.toggle_index(emulation_mode); + let arx_index_value = unsafe { self.arx_index.read() }; + unsafe { + self.arx_index.write(arx_index_value | 0x20); + } + } +} + +#[derive(Debug)] +pub struct CrtcControllerRegisters { + crx_index_cga: Port, + crx_index_mda: Port, + crx_data_cga: Port, + crx_data_mda: Port, +} + +impl CrtcControllerRegisters { + pub fn new() -> CrtcControllerRegisters { + CrtcControllerRegisters { + crx_index_cga: Port::new(CRX_INDEX_CGA_ADDRESS), + crx_index_mda: Port::new(CRX_INDEX_MDA_ADDRESS), + crx_data_cga: Port::new(CRX_DATA_CGA_ADDRESS), + crx_data_mda: Port::new(CRX_DATA_MDA_ADDRESS), + } + } + + pub fn read(&mut self, emulation_mode: EmulationMode, index: CrtcControllerIndex) -> u8 { + self.set_index(emulation_mode, index); + unsafe { self.get_data_port(emulation_mode).read() } + } + + pub fn write(&mut self, emulation_mode: EmulationMode, index: CrtcControllerIndex, value: u8) { + self.set_index(emulation_mode, index); + unsafe { + self.get_data_port(emulation_mode).write(value); + } + } + + fn set_index(&mut self, emulation_mode: EmulationMode, index: CrtcControllerIndex) { + unsafe { + self.get_index_port(emulation_mode).write(u8::from(index)); + } + } + + fn get_data_port(&mut self, emulation_mode: EmulationMode) -> &mut Port { + match emulation_mode { + EmulationMode::Cga => &mut self.crx_data_cga, + EmulationMode::Mda => &mut self.crx_data_mda, + } + } + + fn get_index_port(&mut self, emulation_mode: EmulationMode) -> &mut Port { + match emulation_mode { + EmulationMode::Cga => &mut self.crx_index_cga, + EmulationMode::Mda => &mut self.crx_index_mda, + } + } +}