Basic tests

src/configurations.rs

@@ -5,10 +5,15 @@ use super::registers::{
 /// Represents a set of vga registers for a given mode.
 #[derive(Debug)]
 pub struct VgaConfiguration {
+    /// Represents the configuration value for the miscellaneous output register.
     pub miscellaneous_output: u8,
+    /// Represents the configuration values for the sequencer registers.
     pub sequencer_registers: &'static [(SequencerIndex, u8)],
+    /// Represents the configuration values for the crtc controller registers.
     pub crtc_controller_registers: &'static [(CrtcControllerIndex, u8)],
+    /// Represents the configuration values for the graphics controller registers.
     pub graphics_controller_registers: &'static [(GraphicsControllerIndex, u8)],
+    /// Represents the configuration values for the attribute controller registers.
     pub attribute_controller_registers: &'static [(AttributeControllerIndex, u8)],
 }
 

src/lib.rs

@@ -7,12 +7,16 @@
 #![no_std]
 #![warn(missing_docs)]
 
-pub mod colors;
+mod colors;
 mod configurations;
 mod fonts;
 mod registers;
-pub mod vga;
+mod vga;
 mod writers;
 
-pub use self::vga::{VideoMode, VGA};
+pub use self::configurations::{
+    VgaConfiguration, MODE_40X25_CONFIGURATION, MODE_40X50_CONFIGURATION,
+    MODE_640X480X16_CONFIGURATION, MODE_80X25_CONFIGURATION,
+};
+pub use self::vga::{Vga, VideoMode, VGA};
 pub use self::writers::{Graphics640x480x16, Text40x25, Text40x50, Text80x25};

src/registers.rs

@@ -271,6 +271,12 @@ impl AttributeControllerRegisters {
         }
     }
 
+    pub fn read(&mut self, emulation_mode: EmulationMode, index: AttributeControllerIndex) -> u8 {
+        self.toggle_index(emulation_mode);
+        self.set_index(index);
+        unsafe { self.arx_data.read() }
+    }
+
     pub fn write(
         &mut self,
         emulation_mode: EmulationMode,

src/vga.rs

@@ -7,9 +7,9 @@ use super::{
     },
     fonts::{VgaFont, TEXT_8X16_FONT, TEXT_8X8_FONT},
     registers::{
-        AttributeControllerRegisters, CrtcControllerIndex, CrtcControllerRegisters, EmulationMode,
-        GeneralRegisters, GraphicsControllerIndex, GraphicsControllerRegisters, SequencerIndex,
-        SequencerRegisters,
+        AttributeControllerIndex, AttributeControllerRegisters, CrtcControllerIndex,
+        CrtcControllerRegisters, EmulationMode, GeneralRegisters, GraphicsControllerIndex,
+        GraphicsControllerRegisters, SequencerIndex, SequencerRegisters,
     },
 };
 use conquer_once::spin::Lazy;
@@ -131,17 +131,44 @@ impl Vga {
         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 {
+    /// Returns the current value of the miscellaneous output register.
+    pub fn read_msr(&mut self) -> u8 {
+        self.general_registers.read_msr()
+    }
+
+    /// Returns the current value of the sequencer register, as determined by `index`.
+    pub fn read_sequencer(&mut self, index: SequencerIndex) -> u8 {
+        self.sequencer_registers.read(index)
+    }
+
+    /// Returns the current value of the graphics controller register, as determined by `index`.
+    pub fn read_graphics_controller(&mut self, index: GraphicsControllerIndex) -> u8 {
+        self.graphics_controller_registers.read(index)
+    }
+
+    /// Returns the current value of the attribute controller register, as determined by `emulation_mode`
+    /// and `index`.
+    pub fn read_attribute_controller(
+        &mut self,
+        emulation_mode: EmulationMode,
+        index: AttributeControllerIndex,
+    ) -> u8 {
+        self.attribute_controller_registers
+            .read(emulation_mode, index)
+    }
+
+    /// Returns the current value of the crtc controller, as determined by `emulation_mode`
+    /// and `index`.
+    pub fn read_crtc_controller(
+        &mut self,
+        emulation_mode: EmulationMode,
+        index: CrtcControllerIndex,
+    ) -> u8 {
+        self.crtc_controller_registers.read(emulation_mode, index)
+    }
+
+    /// Returns the current `EmulationMode` as determined by the miscellaneous output register.
+    pub fn get_emulation_mode(&mut self) -> EmulationMode {
         EmulationMode::from(self.general_registers.read_msr() & 0x1)
     }
 

testing/Cargo.toml

@@ -5,7 +5,8 @@ authors = ["Ryan Kennedy <rkennedy9064@gmail.com>"]
 edition = "2018"
 
 [dependencies]
-bootloader = { version = "0.8.9", features = ["map_physical_memory"] }
+# TODO: Move back to crate when vga mapping is merged in.
+bootloader = { git = "https://github.com/RKennedy9064/bootloader", branch = "vga-mappings", features = ["map_physical_memory"] }
 conquer-once = { version = "0.2.0", default-features = false }
 spinning_top = { version = "0.1.0", features = ["nightly"] }
 pic8259_simple = "0.1.1"

testing/tests/vga.rs

@@ -6,7 +6,10 @@
 
 use core::panic::PanicInfo;
 use testing::{gdt, interrupts, serial_print, serial_println};
-use vga::{VideoMode, VGA};
+use vga::{
+    Vga, VgaConfiguration, VideoMode, MODE_40X25_CONFIGURATION, MODE_40X50_CONFIGURATION,
+    MODE_640X480X16_CONFIGURATION, MODE_80X25_CONFIGURATION, VGA,
+};
 
 #[no_mangle] // don't mangle the name of this function
 pub extern "C" fn _start() -> ! {
@@ -28,12 +31,70 @@ fn panic(info: &PanicInfo) -> ! {
     testing::test_panic_handler(info)
 }
 
+#[test_case]
+fn set_mode_40x25() {
+    serial_print!("mode 40x25... ");
+
+    let mut vga = VGA.lock();
+    vga.set_video_mode(VideoMode::Mode40x25);
+    check_registers(&mut vga, &MODE_40X25_CONFIGURATION);
+
+    serial_println!("[ok]");
+}
+
+#[test_case]
+fn set_mode_40x50() {
+    serial_print!("mode 40x50... ");
+
+    let mut vga = VGA.lock();
+    vga.set_video_mode(VideoMode::Mode40x50);
+    check_registers(&mut vga, &MODE_40X50_CONFIGURATION);
+
+    serial_println!("[ok]");
+}
+
 #[test_case]
 fn set_mode_80x25() {
     serial_print!("mode 80x25... ");
 
     let mut vga = VGA.lock();
     vga.set_video_mode(VideoMode::Mode80x25);
+    check_registers(&mut vga, &MODE_80X25_CONFIGURATION);
 
     serial_println!("[ok]");
 }
+
+#[test_case]
+fn set_mode_640x480x16() {
+    serial_print!("mode 640x480x16... ");
+
+    let mut vga = VGA.lock();
+    vga.set_video_mode(VideoMode::Mode640x480x16);
+    check_registers(&mut vga, &MODE_640X480X16_CONFIGURATION);
+
+    serial_println!("[ok]");
+}
+
+fn check_registers(vga: &mut Vga, configuration: &VgaConfiguration) {
+    let emulation_mode = vga.get_emulation_mode();
+    assert_eq!(vga.read_msr(), configuration.miscellaneous_output);
+
+    for (index, value) in configuration.sequencer_registers {
+        assert_eq!(vga.read_sequencer(*index), *value);
+    }
+
+    for (index, value) in configuration.crtc_controller_registers {
+        assert_eq!(vga.read_crtc_controller(emulation_mode, *index), *value);
+    }
+
+    for (index, value) in configuration.graphics_controller_registers {
+        assert_eq!(vga.read_graphics_controller(*index), *value);
+    }
+
+    for (index, value) in configuration.attribute_controller_registers {
+        assert_eq!(
+            vga.read_attribute_controller(emulation_mode, *index),
+            *value
+        );
+    }
+}