2012-08-01 14:53:51 -04:00
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/*******************************************************************************
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2012-01-07 15:09:01 -05:00
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2014-01-03 19:28:59 -05:00
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2014.
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2012-01-07 15:09:01 -05:00
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2013-07-10 09:26:01 -04:00
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This file is part of Sortix.
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2012-01-07 15:09:01 -05:00
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2013-07-10 09:26:01 -04:00
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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2012-01-07 15:09:01 -05:00
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2013-07-10 09:26:01 -04:00
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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2012-01-07 15:09:01 -05:00
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2013-07-10 09:26:01 -04:00
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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2012-01-07 15:09:01 -05:00
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2013-07-10 09:26:01 -04:00
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kb/ps2.cpp
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A driver for the PS2 Keyboard.
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2012-01-07 15:09:01 -05:00
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2012-08-01 14:53:51 -04:00
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*******************************************************************************/
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2012-01-07 15:09:01 -05:00
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2013-10-26 20:42:10 -04:00
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#include <assert.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#if defined(__x86_64__)
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#include <msr.h>
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#endif
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2012-08-07 18:19:44 -04:00
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#include <sortix/keycodes.h>
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#include <sortix/kernel/cpu.h>
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#include <sortix/kernel/debugger.h>
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#include <sortix/kernel/interrupt.h>
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#include <sortix/kernel/kernel.h>
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#include <sortix/kernel/keyboard.h>
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#include <sortix/kernel/thread.h>
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#if defined(__i386__)
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#include "../x86-family/gdt.h"
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#endif
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#include "ps2.h"
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namespace Sortix {
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const uint16_t DATA = 0x0;
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const uint16_t COMMAND = 0x0;
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const uint16_t STATUS = 0x4;
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const uint8_t CMD_SETLED = 0xED;
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const uint8_t LED_SCRLCK = 1 << 0;
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const uint8_t LED_NUMLCK = 1 << 1;
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const uint8_t LED_CAPSLCK = 1 << 2;
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void PS2Keyboard__OnInterrupt(CPU::InterruptRegisters* regs, void* user)
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{
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((PS2Keyboard*) user)->OnInterrupt(regs);
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}
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PS2Keyboard::PS2Keyboard(uint16_t iobase, uint8_t interrupt)
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{
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this->queue = NULL;
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this->queuelength = 0;
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this->queueoffset = 0;
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this->queueused = 0;
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this->owner = NULL;
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this->ownerptr = NULL;
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this->iobase = iobase;
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this->interrupt = interrupt;
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this->leds = 0;
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this->scancodeescaped = false;
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this->kblock = KTHREAD_MUTEX_INITIALIZER;
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Interrupt::RegisterHandler(interrupt, PS2Keyboard__OnInterrupt, this);
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// If any scancodes were already pending, our interrupt handler will
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// never be called. Let's just discard anything pending.
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PopScancode();
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}
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PS2Keyboard::~PS2Keyboard()
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{
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Interrupt::RegisterHandler(interrupt, NULL, NULL);
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delete[] queue;
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}
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struct PS2KeyboardWork
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{
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PS2Keyboard* kb;
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uint8_t scancode;
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};
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static void PS2Keyboard__InterruptWork(void* payload, size_t size)
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{
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assert(size == sizeof(PS2KeyboardWork));
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PS2KeyboardWork* work = (PS2KeyboardWork*) payload;
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work->kb->InterruptWork(work->scancode);
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}
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void PS2Keyboard::OnInterrupt(CPU::InterruptRegisters* regs)
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{
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uint8_t scancode = PopScancode();
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if ( scancode == KBKEY_F10 )
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{
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Thread* thread = CurrentThread();
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#if defined(__i386__)
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thread->fsbase = (unsigned long) GDT::GetFSBase();
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thread->gsbase = (unsigned long) GDT::GetGSBase();
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#elif defined(__x86_64__)
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thread->fsbase = (unsigned long) rdmsr(MSRID_FSBASE);
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thread->gsbase = (unsigned long) rdmsr(MSRID_GSBASE);
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#endif
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thread->SaveRegisters(regs);
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Debugger::Run();
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}
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PS2KeyboardWork work;
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work.kb = this;
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work.scancode = scancode;
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Interrupt::ScheduleWork(PS2Keyboard__InterruptWork, &work, sizeof(work));
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}
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void PS2Keyboard::InterruptWork(uint8_t scancode)
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{
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kthread_mutex_lock(&kblock);
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int kbkey = DecodeScancode(scancode);
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if ( !kbkey )
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{
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kthread_mutex_unlock(&kblock);
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return;
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}
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if ( !PushKey(kbkey) )
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{
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Log::PrintF("Warning: dropping keystroke due to insufficient "
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"storage space in PS2 keyboard driver.\n");
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kthread_mutex_unlock(&kblock);
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return;
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}
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uint8_t newleds = leds;
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if ( kbkey == KBKEY_CAPSLOCK )
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newleds ^= LED_CAPSLCK;
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if ( kbkey == KBKEY_SCROLLLOCK )
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newleds ^= LED_SCRLCK;
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if ( kbkey == KBKEY_NUMLOCK )
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newleds ^= LED_NUMLCK;
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if ( newleds != leds )
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UpdateLEDs(leds = newleds);
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kthread_mutex_unlock(&kblock);
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NotifyOwner();
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}
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void PS2Keyboard::NotifyOwner()
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{
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if ( !owner)
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return;
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owner->OnKeystroke(this, ownerptr);
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}
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int PS2Keyboard::DecodeScancode(uint8_t scancode)
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{
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const uint8_t SCANCODE_ESCAPE = 0xE0;
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if ( scancode == SCANCODE_ESCAPE )
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{
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scancodeescaped = true;
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return 0;
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}
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int offset = scancodeescaped ? 0x80 : 0;
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int kbkey = scancode & 0x7F;
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kbkey = scancode & 0x80 ? -kbkey - offset : kbkey + offset;
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scancodeescaped = false;
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// kbkey is now in the format specified in <sortix/keycodes.h>.
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return kbkey;
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}
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uint8_t PS2Keyboard::PopScancode()
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{
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return CPU::InPortB(iobase + DATA);
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}
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void PS2Keyboard::UpdateLEDs(int ledval)
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{
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while ( (CPU::InPortB(iobase + STATUS) & (1<<1)) );
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CPU::OutPortB(iobase + COMMAND, CMD_SETLED);
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while ( (CPU::InPortB(iobase + STATUS) & (1<<1)) );
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CPU::OutPortB(iobase + COMMAND, ledval);
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}
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void PS2Keyboard::SetOwner(KeyboardOwner* owner, void* user)
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{
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kthread_mutex_lock(&kblock);
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this->owner = owner;
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this->ownerptr = user;
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kthread_mutex_unlock(&kblock);
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if ( queueused )
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NotifyOwner();
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}
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bool PS2Keyboard::PushKey(int key)
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{
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// Check if we need to allocate or resize the circular queue.
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if ( queueused == queuelength )
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{
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size_t newqueuelength = (queuelength) ? queuelength * 2 : 32UL;
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int* newqueue = new int[newqueuelength];
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if ( !newqueue )
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return false;
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size_t elemsize = sizeof(*queue);
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size_t leadingavai = queuelength-queueoffset;
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size_t leading = (leadingavai < queueused) ? leadingavai : queueused;
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size_t trailing = queueused - leading;
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memcpy(newqueue, queue + queueoffset, leading * elemsize);
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memcpy(newqueue + leading, queue, trailing * elemsize);
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delete[] queue;
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queue = newqueue;
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queuelength = newqueuelength;
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queueoffset = 0;
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}
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queue[(queueoffset + queueused++) % queuelength] = key;
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return true;
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}
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int PS2Keyboard::PopKey()
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{
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if ( !queueused )
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return 0;
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int kbkey = queue[queueoffset];
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queueoffset = (queueoffset + 1) % queuelength;
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queueused--;
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return kbkey;
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}
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int PS2Keyboard::Read()
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{
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ScopedLock lock(&kblock);
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return PopKey();
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}
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size_t PS2Keyboard::GetPending() const
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{
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ScopedLock lock(&kblock);
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return queueused;
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}
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bool PS2Keyboard::HasPending() const
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{
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ScopedLock lock(&kblock);
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return queueused;
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}
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} // namespace Sortix
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