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Kernel: Implement scrolling critical messages vga text mode console

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DaftMouse 2023-08-30 15:50:47 -03:00 • committed by Andrew Kaster
parent 6f7f0b3a8c
commit 29c89d3b95
1 changed files with 21 additions and 4 deletions
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25
Kernel/Devices/GPU/Console/VGATextModeConsole.cpp
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@ -115,6 +115,15 @@ void VGATextModeConsole::clear(size_t x, size_t y, size_t length)
void VGATextModeConsole::scroll_up() void VGATextModeConsole::scroll_up()
{ {
auto* start_of_buffer = m_current_vga_window.as_ptr();
auto* start_of_second_line = m_current_vga_window.offset(max_column() * 2).as_ptr();
auto size_to_move = (max_row() - 1) * max_column() * 2;
memmove(start_of_buffer, start_of_second_line, size_to_move);
// Clear the last row with a memset, we're called from `write` here which already
// grabs `m_vga_lock` so we will get a deadlock trying to call `clear_vga_row`
auto* last_line = m_current_vga_window.offset((max_row() - 1) * width() * 2).as_ptr();
memset(last_line, 0, width() * 2);
} }
void VGATextModeConsole::write(size_t x, size_t y, char ch, bool critical) void VGATextModeConsole::write(size_t x, size_t y, char ch, bool critical)
@ -133,8 +142,10 @@ void VGATextModeConsole::write(size_t x, size_t y, char ch, Color background, Co
m_x = 0; m_x = 0;
m_y += 1; m_y += 1;
if (m_y >= max_row()) if (m_y >= max_row()) {
m_y = 0; m_y = max_row() - 1;
scroll_up();
}
return; return;
} }
@ -145,8 +156,14 @@ void VGATextModeConsole::write(size_t x, size_t y, char ch, Color background, Co
if (m_x >= max_column()) { if (m_x >= max_column()) {
m_x = 0; m_x = 0;
m_y = y + 1; m_y = y + 1;
if (m_y >= max_row()) if (m_y >= max_row()) {
m_y = 0; if (critical) {
m_y = max_row() - 1;
scroll_up();
} else {
m_y = 0;
}
}
} }
} }