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/*
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/*
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 * Copyright (C) 2003 Josef Cejka
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 * Copyright (C) 2005 Jakub Jermar
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 * Copyright (C) 2005 Jakub Jermar
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 * All rights reserved.
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 * All rights reserved.
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 *
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * modification, are permitted provided that the following conditions
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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 */
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#include <arch/drivers/keyboard.h>
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#include <arch/drivers/keyboard.h>
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#include <console/chardev.h>
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#include <console/console.h>
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#include <arch/cp0.h>
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#include <arch/cp0.h>
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#include <putchar.h>
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#include <putchar.h>
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#include <synch/spinlock.h>
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#include <synch/waitq.h>
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#include <typedefs.h>
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static chardev_t kbrd;
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static void keyboard_enable(void);
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/** Initialize keyboard subsystem. */
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void keyboard_init(void)
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void keyboard_init(void)
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{
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{
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    /* unmask keyboard interrupt */
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    cp0_unmask_int(KEYBOARD_IRQ);
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    cp0_unmask_int(KEYBOARD_IRQ);
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    chardev_initialize(&kbrd, keyboard_enable);
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    stdin = &kbrd;
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}
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}
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/** Process keyboard interrupt.
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 *
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 * This function is called directly from the interrupt handler.
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 * It feeds the keyboard buffer with characters read. When the buffer
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 * is full, it simply masks the keyboard interrupt signal.
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 */
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void keyboard(void)
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void keyboard(void)
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{
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{
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    char ch;
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    spinlock_lock(&kbrd.lock);
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    kbrd.counter++;
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    if (kbrd.counter == CHARDEV_BUFLEN - 1) {
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            /* buffer full => disable keyboard interrupt */
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        cp0_mask_int(KEYBOARD_IRQ);
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    }
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    putchar(*((char *) KEYBOARD_ADDRESS));
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    ch = *((char *) KEYBOARD_ADDRESS);
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    putchar(ch);
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    kbrd.buffer[kbrd.index++] = ch;
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    kbrd.index = kbrd.index % CHARDEV_BUFLEN; /* index modulo size of buffer */
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    waitq_wakeup(&kbrd.wq, WAKEUP_FIRST);
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    spinlock_unlock(&kbrd.lock);
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}
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/* Called from getc(). */
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void keyboard_enable(void)
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{
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    cp0_unmask_int(KEYBOARD_IRQ);
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}
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}