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55 lines
1.2 KiB
C++
55 lines
1.2 KiB
C++
4 weeks ago
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#include "portio.hpp"
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#include "vgaterminal.hpp"
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#include <algorithm>
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#include <cstddef>
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#include <cstdint>
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#include <utility>
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void VGATerminal::write(char c) noexcept
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{
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switch (c) {
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case '\n':
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offset += Width;
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[[fallthrough]];
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case '\r':
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offset -= offset % Width;
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break;
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default:
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checkpos();
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put(c);
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updatecursor();
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break;
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}
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}
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void VGATerminal::put(char c) noexcept
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{
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std::uint16_t cell = c
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| (std::to_underlying(foreground) << 8)
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| (std::to_underlying(background) << 12);
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auto ptr = reinterpret_cast<std::uint16_t *>(Videoram);
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ptr[offset++] = cell;
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}
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void VGATerminal::checkpos() noexcept
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{
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if (offset >= Width * Height) {
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auto ptr = reinterpret_cast<std::uint16_t *>(Videoram);
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const auto end = ptr + Width * Height;
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std::copy(ptr + Width, end, ptr);
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std::fill(end - Width, end, 0);
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offset = Width * Height - Width;
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}
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}
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void VGATerminal::updatecursor() const noexcept
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{
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outb(0x03d4, 0x0f);
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outb(0x03d5, static_cast<std::uint8_t>(offset));
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outb(0x03d4, 0x0e);
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outb(0x03d5, static_cast<std::uint8_t>(offset >> 8));
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}
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