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3743 rimsky 1
/*
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 * Copyright (c) 2008 Pavel Rimsky
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 * All rights reserved.
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 *
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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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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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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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 */
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/** @addtogroup sparc64
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 * @{
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 */
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/**
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 * @file
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 * @brief   Niagara input/output driver based on hypervisor calls.
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 */
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#include <arch/drivers/niagara.h>
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#include <console/chardev.h>
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#include <console/console.h>
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#include <arch/drivers/kbd.h>
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#include <arch/sun4v/hypercall.h>
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/* functions referenced from definitions of I/O operations structures */
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static void niagara_putchar(chardev_t *, const char);
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static void niagara_noop(chardev_t *);
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static char niagara_read(chardev_t *);
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/** character device operations */
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static chardev_operations_t niagara_ops = {
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    .write = niagara_putchar,
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    .suspend = niagara_noop,
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    .resume = niagara_noop,
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    .read = niagara_read
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};
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/** Niagara character device */
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chardev_t niagara_io;
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/** defined in drivers/kbd.c */
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extern kbd_type_t kbd_type;
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/** Writes a single character to the standard output. */
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static void niagara_putchar(struct chardev * cd, const char c)
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{
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    __hypercall_fast1(CONS_PUTCHAR, c);
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    if (c == '\n')
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        __hypercall_fast1(CONS_PUTCHAR, '\r');
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}
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/**
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 * Grabs the input for kernel.
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 */
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void niagara_grab(void)
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{
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}
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/**
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 * Releases the input so that userspace can use it.
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 */
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void niagara_release(void)
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{
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}
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/**
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 * Default suspend/resume operation for the input device.
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 */
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static void niagara_noop(chardev_t *d)
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{
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}
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/**
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 * Called when actively reading the character. Not implemented yet.
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 */
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static char niagara_read(chardev_t *d)
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{
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    return (char) 0;
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}
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/**
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 * Function regularly called by the keyboard polling thread. Asks the
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 * hypervisor whether there is any unread character. If so, it picks it up
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 * and sends it to the upper layers of HelenOS.
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 */
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void niagara_poll(void)
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{
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    uint64_t c = 50;
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    if (__hypercall_fast_ret1(0, 0, 0, 0, 0, CONS_GETCHAR, &c) == EOK) {
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        chardev_push_character(&niagara_io, c);
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        if (c == '\r')
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            chardev_push_character(&niagara_io, '\n');
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    }
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}
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/**
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 * Initializes the input/output subsystem so that the Niagara standard
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 * input/output is used.
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 */
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void niagara_init(void)
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{
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    kbd_type = KBD_SUN4V;
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    chardev_initialize("niagara_io", &niagara_io, &niagara_ops);
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    stdin = &niagara_io;
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    stdout = &niagara_io;
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}
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/** @}
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 */