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#include "kapi/cio.hpp"
#include "x86_64/boot/boot.hpp"
#include "x86_64/boot/ld.hpp"
#include "x86_64/vga/crtc.hpp"
#include "x86_64/vga/text.hpp"
#include <bit>
#include <cstddef>
#include <cstdint>
#include <string_view>
namespace teachos::vga::x86_64::text
{
namespace
{
constexpr auto default_buffer_address = std::uintptr_t{0xb8000};
constexpr auto default_buffer_width = 80z;
constexpr auto default_buffer_height = 25z;
constexpr auto bit_cursor_enabled = 5U;
} // namespace
device::device()
: m_buffer{default_buffer_width, default_buffer_height,
std::bit_cast<buffer::cell *>(default_buffer_address +
std::bit_cast<std::uintptr_t>(&teachos::boot::x86_64::TEACHOS_VMA)),
boot::bootstrap_information.vga_buffer_index}
{
clear();
}
auto device::clear() -> void
{
m_buffer.clear();
}
auto device::cursor(bool enabled) -> void
{
auto cursor_disable_byte = std::byte{!enabled} << bit_cursor_enabled;
crtc::address::write(crtc::registers::cursor_start);
crtc::data::write(crtc::data::read() | cursor_disable_byte);
}
auto device::write(cio::output_stream stream, std::string_view text) -> void
{
auto attributes = [&] -> attribute {
switch (stream)
{
case cio::output_stream::stderr:
return red_on_black;
default:
return green_on_black;
}
}();
m_buffer.write(text, attributes);
}
} // namespace teachos::vga::x86_64::text
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