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https://github.com/LadybirdBrowser/ladybird.git
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c6f2890d8e
FileHandle gets a hasDataAvailableForRead() getter. If this returns true in sys$read(), the task will block(BlockedRead) + yield. The fd blocked on is stored in Task::m_fdBlockedOnRead. The scheduler then looks at the state of that fd during the unblock phase. This makes "sh" restful. :^) There's still some problem with the kernel not surviving the colonel task getting scheduled. I need to figure that out and fix it.
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', '-', '=', 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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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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