mirror of
https://github.com/fergalmoran/ladybird.git
synced 2025-12-28 04:08:08 +00:00
bd2b5327d0
This doesn't mean we get any line editing just yet. But the keyboard device now recognizes the backspace key, and the console device knows what to do with the backspace characters.
109 lines
2.8 KiB
C++
109 lines
2.8 KiB
C++
#include "types.h"
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#include "i386.h"
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#include "IO.h"
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#include "VGA.h"
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#include "PIC.h"
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#include "Keyboard.h"
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#include <AK/Assertions.h>
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#define IRQ_KEYBOARD 1
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#define I8042_BUFFER 0x60
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#define I8042_STATUS 0x64
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#define SET_LEDS 0xED
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#define DATA_AVAILABLE 0x01
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#define I8042_ACK 0xFA
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#define MOD_ALT 1
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#define MOD_CTRL 2
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#define MOD_SHIFT 4
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static char map[0x100] =
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{
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0, 0, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', 0x08, 0,
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'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', 0, 0,
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'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'', '`', 0, '\\',
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'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/',
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0, 0, 0, ' '
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};
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static char shift_map[0x100] =
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{
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0, 0, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+', 0, 0,
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'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', 0, 0,
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'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', '~', 0, '|',
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'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?',
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0, 0, 0, ' '
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};
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void Keyboard::handleIRQ()
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{
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while (IO::in8(0x64) & 1) {
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BYTE ch = IO::in8(0x60);
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switch (ch) {
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case 0x38: m_modifiers |= MOD_ALT; break;
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case 0xB8: m_modifiers &= ~MOD_ALT; break;
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case 0x1D: m_modifiers |= MOD_CTRL; break;
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case 0x9D: m_modifiers &= ~MOD_CTRL; break;
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case 0x2A: m_modifiers |= MOD_SHIFT; break;
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case 0xAA: m_modifiers &= ~MOD_SHIFT; break;
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case 0x1C: /* enter */ m_queue.enqueue('\n'); break;
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case 0xFA: /* i8042 ack */ break;
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default:
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if (ch & 0x80) {
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// key has been depressed
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break;
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}
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if (!m_modifiers)
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m_queue.enqueue(map[ch]);
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else if (m_modifiers & MOD_SHIFT)
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m_queue.enqueue(shift_map[ch]);
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else if (m_modifiers & MOD_CTRL) {
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// FIXME: This is obviously not a good enough way to process ctrl+whatever.
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m_queue.enqueue('^');
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m_queue.enqueue(shift_map[ch]);
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}
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}
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//break;
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}
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}
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Keyboard::Keyboard()
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: IRQHandler(IRQ_KEYBOARD)
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{
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// Empty the buffer of any pending data.
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// I don't care what you've been pressing until now!
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while (IO::in8(I8042_STATUS ) & DATA_AVAILABLE)
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IO::in8(I8042_BUFFER);
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enableIRQ();
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}
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Keyboard::~Keyboard()
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{
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ASSERT_NOT_REACHED();
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}
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bool Keyboard::hasDataAvailableForRead() const
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{
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return !m_queue.isEmpty();
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}
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ssize_t Keyboard::read(byte* buffer, size_t size)
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{
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ssize_t nread = 0;
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while (nread < size) {
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if (m_queue.isEmpty())
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break;
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buffer[nread++] = m_queue.dequeue();
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}
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return nread;
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}
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ssize_t Keyboard::write(const byte* data, size_t size)
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{
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return 0;
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}
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