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Added some cursor manipulation

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This commit is contained in:
Ryan Kennedy 2020-03-16 18:52:48 -05:00
parent ac8da132e5
commit a00a9762e6
1 changed files with 53 additions and 14 deletions
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67
src/writers/mod.rs
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@ -72,16 +72,61 @@ pub trait TextWriter {
}
}
/// Disables the cursor in vga text modes.
fn disable_cursor(&self) {
let (mut vga, _frame_buffer) = self.get_frame_buffer();
let emulation_mode = vga.get_emulation_mode();
let cursor_start =
vga.read_crtc_controller(emulation_mode, CrtcControllerIndex::TextCursorStart);
vga.write_crtc_controller(
emulation_mode,
CrtcControllerIndex::TextCursorStart,
cursor_start | 0x20,
);
}
/// Enables the cursor in vga text modes.
fn enable_cursor(&self) {
let (mut vga, _frame_buffer) = self.get_frame_buffer();
let emulation_mode = vga.get_emulation_mode();
let cursor_start =
vga.read_crtc_controller(emulation_mode, CrtcControllerIndex::TextCursorStart);
vga.write_crtc_controller(
emulation_mode,
CrtcControllerIndex::TextCursorStart,
cursor_start & 0xDF,
);
}
/// Sets the size of the cursor, as specified by `scan_line_start` and `scan_line_end`.
///
/// This field controls the appearance of the text mode cursor by specifying the scan
/// line location within a character cell. The top most scan line is 0, with the bottom
/// determined by `CrtcControllerIndex::MaxiumumScanLine (usually 15)`.
/// If `scan_line_start > scan_line_end`, the cursor isn't drawn.
fn set_cursor(&self, scan_line_start: u8, scan_line_end: u8) {
let (mut vga, _frame_buffer) = self.get_frame_buffer();
let emulation_mode = vga.get_emulation_mode();
let cursor_start =
vga.read_crtc_controller(emulation_mode, CrtcControllerIndex::TextCursorStart) & 0xC0;
let cursor_end =
vga.read_crtc_controller(emulation_mode, CrtcControllerIndex::TextCursorEnd) & 0xE0;
vga.write_crtc_controller(
emulation_mode,
CrtcControllerIndex::TextCursorStart,
cursor_start | scan_line_start,
);
vga.write_crtc_controller(
emulation_mode,
CrtcControllerIndex::TextCursorEnd,
cursor_end | scan_line_end,
);
}
/// Sets the current text cursor to the position specified by
/// `x` and `y`.
///
/// Panics if `x >= se.lf.get_width()` or `y >= self.get_height()`.
fn set_cursor_position(&self, x: usize, y: usize) {
let width = self.get_width();
let height = self.get_height();
assert!(x < width, "x >= {}", width);
assert!(y < height, "y >= {}", height);
let offset = width * y + x;
let offset = self.get_width() * y + x;
let (mut vga, _frame_buffer) = self.get_frame_buffer();
let emulation_mode = vga.get_emulation_mode();
let cursor_start = offset & 0xFF;
@ -99,15 +144,9 @@ pub trait TextWriter {
}
/// Prints the given `character` and `color` at `(x, y)`.
///
/// Panics if `x >= self.get_width()` or `y >= self.get_height()`.
fn write_character(&self, x: usize, y: usize, screen_character: ScreenCharacter) {
let width = self.get_width();
let height = self.get_height();
assert!(x < width, "x >= {}", width);
assert!(y < height, "y >= {}", height);
let (_vga, frame_buffer) = self.get_frame_buffer();
let offset = width * y + x;
let offset = self.get_width() * y + x;
unsafe {
frame_buffer.add(offset).write_volatile(screen_character);
}