| 0,0 → 1,424 |
|---|
| /* |
| * Copyright (C) 2001-2004 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** @addtogroup genarch |
| * @{ |
| */ |
| /** |
| * @file |
| * @brief i8042 processor driver. |
| * |
| * It takes care of low-level keyboard functions. |
| */ |
| |
| #include <genarch/i8042/i8042.h> |
| #include <arch/drivers/i8042.h> |
| #include <arch/interrupt.h> |
| #include <cpu.h> |
| #include <arch/asm.h> |
| #include <arch.h> |
| #include <synch/spinlock.h> |
| #include <typedefs.h> |
| #include <console/chardev.h> |
| #include <console/console.h> |
| #include <macros.h> |
| #include <interrupt.h> |
| |
| /* Keyboard commands. */ |
| #define KBD_ENABLE 0xf4 |
| #define KBD_DISABLE 0xf5 |
| #define KBD_ACK 0xfa |
| |
| /* |
| * 60 Write 8042 Command Byte: next data byte written to port 60h is |
| * placed in 8042 command register. Format: |
| * |
| * |7|6|5|4|3|2|1|0|8042 Command Byte |
| * | | | | | | | `---- 1=enable output register full interrupt |
| * | | | | | | `----- should be 0 |
| * | | | | | `------ 1=set status register system, 0=clear |
| * | | | | `------- 1=override keyboard inhibit, 0=allow inhibit |
| * | | | `-------- disable keyboard I/O by driving clock line low |
| * | | `--------- disable auxiliary device, drives clock line low |
| * | `---------- IBM scancode translation 0=AT, 1=PC/XT |
| * `----------- reserved, should be 0 |
| */ |
| |
| #define i8042_SET_COMMAND 0x60 |
| #define i8042_COMMAND 0x69 |
| |
| #define i8042_BUFFER_FULL_MASK 0x01 |
| #define i8042_WAIT_MASK 0x02 |
| #define i8042_MOUSE_DATA 0x20 |
| |
| #define KEY_RELEASE 0x80 |
| |
| /** |
| * These codes read from i8042 data register are silently ignored. |
| */ |
| #define IGNORE_CODE 0x7f |
| |
| static void key_released(uint8_t sc); |
| static void key_pressed(uint8_t sc); |
| static char key_read(chardev_t *d); |
| |
| #define PRESSED_SHIFT (1<<0) |
| #define PRESSED_CAPSLOCK (1<<1) |
| #define LOCKED_CAPSLOCK (1<<0) |
| |
| #define ACTIVE_READ_BUFF_SIZE 16 /* Must be power of 2 */ |
| |
| static uint8_t active_read_buff[ACTIVE_READ_BUFF_SIZE]; |
| |
| SPINLOCK_INITIALIZE(keylock); /**< keylock protects keyflags and lockflags. */ |
| static volatile int keyflags; /**< Tracking of multiple keypresses. */ |
| static volatile int lockflags; /**< Tracking of multiple keys lockings. */ |
| |
| static void i8042_suspend(chardev_t *); |
| static void i8042_resume(chardev_t *); |
| |
| static chardev_t kbrd; |
| static chardev_operations_t ops = { |
| .suspend = i8042_suspend, |
| .resume = i8042_resume, |
| .read = key_read |
| }; |
| |
| static void i8042_interrupt(int n, istate_t *istate); |
| static void i8042_wait(void); |
| |
| static iroutine oldvector; |
| /** Initialize keyboard and service interrupts using kernel routine */ |
| void i8042_grab(void) |
| { |
| oldvector = exc_register(VECTOR_KBD, "i8042_interrupt", (iroutine) i8042_interrupt); |
| i8042_wait(); |
| i8042_command_write(i8042_SET_COMMAND); |
| i8042_wait(); |
| i8042_data_write(i8042_COMMAND); |
| i8042_wait(); |
| } |
| /** Resume the former interrupt vector */ |
| void i8042_release(void) |
| { |
| if (oldvector) |
| exc_register(VECTOR_KBD, "user_interrupt", oldvector); |
| } |
| |
| /** Initialize i8042. */ |
| void i8042_init(void) |
| { |
| int i; |
| |
| i8042_grab(); |
| /* Prevent user from accidentaly releasing calling i8042_resume |
| * and disabling keyboard |
| */ |
| oldvector = NULL; |
| |
| trap_virtual_enable_irqs(1<<IRQ_KBD); |
| chardev_initialize("i8042_kbd", &kbrd, &ops); |
| stdin = &kbrd; |
| |
| /* |
| * Clear input buffer. |
| * Number of iterations is limited to prevent infinite looping. |
| */ |
| for (i = 0; (i8042_status_read() & i8042_BUFFER_FULL_MASK) && i < 100; i++) { |
| i8042_data_read(); |
| } |
| } |
| |
| /** Process i8042 interrupt. |
| * |
| * @param n Interrupt vector. |
| * @param istate Interrupted state. |
| */ |
| void i8042_interrupt(int n, istate_t *istate) |
| { |
| uint8_t x; |
| uint8_t status; |
| |
| while (((status=i8042_status_read()) & i8042_BUFFER_FULL_MASK)) { |
| x = i8042_data_read(); |
| |
| if ((status & i8042_MOUSE_DATA)) |
| continue; |
| |
| if (x & KEY_RELEASE) |
| key_released(x ^ KEY_RELEASE); |
| else |
| key_pressed(x); |
| } |
| trap_virtual_eoi(); |
| } |
| |
| /** Wait until the controller reads its data. */ |
| void i8042_wait(void) { |
| while (i8042_status_read() & i8042_WAIT_MASK) { |
| /* wait */ |
| } |
| } |
| |
| /** Process release of key. |
| * |
| * @param sc Scancode of the key being released. |
| */ |
| void key_released(uint8_t sc) |
| { |
| spinlock_lock(&keylock); |
| switch (sc) { |
| case SC_LSHIFT: |
| case SC_RSHIFT: |
| keyflags &= ~PRESSED_SHIFT; |
| break; |
| case SC_CAPSLOCK: |
| keyflags &= ~PRESSED_CAPSLOCK; |
| if (lockflags & LOCKED_CAPSLOCK) |
| lockflags &= ~LOCKED_CAPSLOCK; |
| else |
| lockflags |= LOCKED_CAPSLOCK; |
| break; |
| default: |
| break; |
| } |
| spinlock_unlock(&keylock); |
| } |
| |
| /** Process keypress. |
| * |
| * @param sc Scancode of the key being pressed. |
| */ |
| void key_pressed(uint8_t sc) |
| { |
| char *map = sc_primary_map; |
| char ascii = sc_primary_map[sc]; |
| bool shift, capslock; |
| bool letter = false; |
| |
| spinlock_lock(&keylock); |
| switch (sc) { |
| case SC_LSHIFT: |
| case SC_RSHIFT: |
| keyflags |= PRESSED_SHIFT; |
| break; |
| case SC_CAPSLOCK: |
| keyflags |= PRESSED_CAPSLOCK; |
| break; |
| case SC_SPEC_ESCAPE: |
| break; |
| case SC_LEFTARR: |
| chardev_push_character(&kbrd, 0x1b); |
| chardev_push_character(&kbrd, 0x5b); |
| chardev_push_character(&kbrd, 0x44); |
| break; |
| case SC_RIGHTARR: |
| chardev_push_character(&kbrd, 0x1b); |
| chardev_push_character(&kbrd, 0x5b); |
| chardev_push_character(&kbrd, 0x43); |
| break; |
| case SC_UPARR: |
| chardev_push_character(&kbrd, 0x1b); |
| chardev_push_character(&kbrd, 0x5b); |
| chardev_push_character(&kbrd, 0x41); |
| break; |
| case SC_DOWNARR: |
| chardev_push_character(&kbrd, 0x1b); |
| chardev_push_character(&kbrd, 0x5b); |
| chardev_push_character(&kbrd, 0x42); |
| break; |
| case SC_HOME: |
| chardev_push_character(&kbrd, 0x1b); |
| chardev_push_character(&kbrd, 0x4f); |
| chardev_push_character(&kbrd, 0x48); |
| break; |
| case SC_END: |
| chardev_push_character(&kbrd, 0x1b); |
| chardev_push_character(&kbrd, 0x4f); |
| chardev_push_character(&kbrd, 0x46); |
| break; |
| case SC_DELETE: |
| chardev_push_character(&kbrd, 0x1b); |
| chardev_push_character(&kbrd, 0x5b); |
| chardev_push_character(&kbrd, 0x33); |
| chardev_push_character(&kbrd, 0x7e); |
| break; |
| default: |
| letter = is_lower(ascii); |
| capslock = (keyflags & PRESSED_CAPSLOCK) || (lockflags & LOCKED_CAPSLOCK); |
| shift = keyflags & PRESSED_SHIFT; |
| if (letter && capslock) |
| shift = !shift; |
| if (shift) |
| map = sc_secondary_map; |
| chardev_push_character(&kbrd, map[sc]); |
| break; |
| } |
| spinlock_unlock(&keylock); |
| } |
| |
| /* Called from getc(). */ |
| void i8042_resume(chardev_t *d) |
| { |
| } |
| |
| /* Called from getc(). */ |
| void i8042_suspend(chardev_t *d) |
| { |
| } |
| |
| static uint8_t active_read_buff_read(void) |
| { |
| static int i=0; |
| i &= (ACTIVE_READ_BUFF_SIZE-1); |
| if(!active_read_buff[i]) { |
| return 0; |
| } |
| return active_read_buff[i++]; |
| } |
| |
| static void active_read_buff_write(uint8_t ch) |
| { |
| static int i=0; |
| active_read_buff[i] = ch; |
| i++; |
| i &= (ACTIVE_READ_BUFF_SIZE-1); |
| active_read_buff[i]=0; |
| } |
| |
| |
| static void active_read_key_pressed(uint8_t sc) |
| { |
| char *map = sc_primary_map; |
| char ascii = sc_primary_map[sc]; |
| bool shift, capslock; |
| bool letter = false; |
| |
| /*spinlock_lock(&keylock);*/ |
| switch (sc) { |
| case SC_LSHIFT: |
| case SC_RSHIFT: |
| keyflags |= PRESSED_SHIFT; |
| break; |
| case SC_CAPSLOCK: |
| keyflags |= PRESSED_CAPSLOCK; |
| break; |
| case SC_SPEC_ESCAPE: |
| break; |
| case SC_LEFTARR: |
| active_read_buff_write(0x1b); |
| active_read_buff_write(0x5b); |
| active_read_buff_write(0x44); |
| break; |
| case SC_RIGHTARR: |
| active_read_buff_write(0x1b); |
| active_read_buff_write(0x5b); |
| active_read_buff_write(0x43); |
| break; |
| case SC_UPARR: |
| active_read_buff_write(0x1b); |
| active_read_buff_write(0x5b); |
| active_read_buff_write(0x41); |
| break; |
| case SC_DOWNARR: |
| active_read_buff_write(0x1b); |
| active_read_buff_write(0x5b); |
| active_read_buff_write(0x42); |
| break; |
| case SC_HOME: |
| active_read_buff_write(0x1b); |
| active_read_buff_write(0x4f); |
| active_read_buff_write(0x48); |
| break; |
| case SC_END: |
| active_read_buff_write(0x1b); |
| active_read_buff_write(0x4f); |
| active_read_buff_write(0x46); |
| break; |
| case SC_DELETE: |
| active_read_buff_write(0x1b); |
| active_read_buff_write(0x5b); |
| active_read_buff_write(0x33); |
| active_read_buff_write(0x7e); |
| break; |
| default: |
| letter = is_lower(ascii); |
| capslock = (keyflags & PRESSED_CAPSLOCK) || (lockflags & LOCKED_CAPSLOCK); |
| shift = keyflags & PRESSED_SHIFT; |
| if (letter && capslock) |
| shift = !shift; |
| if (shift) |
| map = sc_secondary_map; |
| active_read_buff_write(map[sc]); |
| break; |
| } |
| /*spinlock_unlock(&keylock);*/ |
| |
| } |
| |
| static char key_read(chardev_t *d) |
| { |
| char ch; |
| |
| while(!(ch = active_read_buff_read())) { |
| uint8_t x; |
| while (!(i8042_status_read() & i8042_BUFFER_FULL_MASK)) |
| ; |
| x = i8042_data_read(); |
| if (x != IGNORE_CODE) { |
| if (x & KEY_RELEASE) |
| key_released(x ^ KEY_RELEASE); |
| else |
| active_read_key_pressed(x); |
| } |
| } |
| return ch; |
| } |
| |
| /** Poll for key press and release events. |
| * |
| * This function can be used to implement keyboard polling. |
| */ |
| void i8042_poll(void) |
| { |
| uint8_t x; |
| |
| while (((x = i8042_status_read() & i8042_BUFFER_FULL_MASK))) { |
| x = i8042_data_read(); |
| if (x != IGNORE_CODE) { |
| if (x & KEY_RELEASE) |
| key_released(x ^ KEY_RELEASE); |
| else |
| key_pressed(x); |
| } |
| } |
| } |
| |
| /** @} |
| */ |
| |