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Kernel: Fix text mode cursor

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Apparently text mode renders cursor in the *foreground* color. My
current clear function used the same color for foreground and background
making the cursor effectively invisible.

Also cursor hiding is now done by moving the cursor off bounds (0, height)
some website I read said this to be valid even on VGA compatible cards
without disable bit.

http://www.osdever.net/FreeVGA/vga/textcur.htm
This commit is contained in:
Bananymous
2025-04-25 02:31:33 +03:00
parent 9f3f8f950a
commit 9ff9d679e9
2 changed files with 35 additions and 23 deletions
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53
kernel/kernel/Terminal/TextModeTerminal.cpp
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@@ -122,32 +122,11 @@ namespace Kernel
{
for (uint32_t y = 0; y < m_height; y++)
for (uint32_t x = 0; x < m_width; x++)
putchar_at(' ', x, y, color, color);
putchar_at(' ', x, y, TerminalColor::WHITE, color);
}
void TextModeTerminalDriver::set_cursor_shown(bool shown)
void TextModeTerminalDriver::move_cursor_impl(uint32_t x, uint32_t y)
{
if (shown)
{
IO::outb(0x3D4, 0x0A);
IO::outb(0x3D5, (IO::inb(0x3D5) & 0xC0) | 14);
IO::outb(0x3D4, 0x0B);
IO::outb(0x3D5, (IO::inb(0x3D5) & 0xE0) | 15);
}
else
{
IO::outb(0x3D4, 0x0A);
IO::outb(0x3D5, 0x20);
}
}
void TextModeTerminalDriver::set_cursor_position(uint32_t x, uint32_t y)
{
// NOTE: cursor is allowed to be on width as scrolling only
// happens after character gets printed to next line
if (x == m_width)
return;
const uint16_t pos = y * m_width + x;
IO::outb(0x3D4, 0x0F);
IO::outb(0x3D5, pos & 0xFF);
@@ -155,4 +134,32 @@ namespace Kernel
IO::outb(0x3D5, pos >> 8);
}
void TextModeTerminalDriver::set_cursor_shown(bool shown)
{
if (m_cursor_shown == shown)
return;
m_cursor_shown = shown;
if (shown)
move_cursor_impl(m_cursor_x, m_cursor_y);
else
move_cursor_impl(0, m_height);
}
void TextModeTerminalDriver::set_cursor_position(uint32_t x, uint32_t y)
{
ASSERT(x <= m_width);
ASSERT(y < m_height);
m_cursor_x = x;
m_cursor_y = y;
if (!m_cursor_shown)
return;
if (x == m_width)
move_cursor_impl(0, m_height);
else
move_cursor_impl(x, y);
}
}