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4044 svoboda 1
/*
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 * Copyright (c) 2005 Jakub Jermar
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 * Copyright (c) 2009 Jiri Svoboda
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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 kbd_port
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 * @ingroup  kbd
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 * @{
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 */
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/** @file
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 * @brief   Ski console keyboard port driver.
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 */
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#include <stdlib.h>
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#include <unistd.h>
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#include <kbd.h>
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#include <kbd_port.h>
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#include <sys/types.h>
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#include <thread.h>
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#include <bool.h>
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#define SKI_GETCHAR     21
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#define POLL_INTERVAL       10000
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static void *ski_thread_impl(void *arg);
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static int32_t ski_getchar(void);
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static volatile bool polling_disabled = false;
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/** Initialize Ski port driver. */
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int kbd_port_init(void)
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{
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    thread_id_t tid;
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    int rc;
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    rc = thread_create(ski_thread_impl, NULL, "kbd_poll", &tid);
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    if (rc != 0) {
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        return rc;
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    }
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    return 0;
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}
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void kbd_port_yield(void)
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{
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    polling_disabled = true;
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}
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void kbd_port_reclaim(void)
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{
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    polling_disabled = false;
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}
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/** Thread to poll Ski for keypresses. */
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static void *ski_thread_impl(void *arg)
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{
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    int32_t c;
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    (void) arg;
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    while (1) {
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        while (polling_disabled == false) {
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            c = ski_getchar();
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            if (c == 0)
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                break;
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            kbd_push_scancode(c);
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        }
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        usleep(POLL_INTERVAL);
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    }
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}
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/** Ask Ski if a key was pressed.
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 *
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 * Use SSC (Simulator System Call) to get character from the debug console.
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 * This call is non-blocking.
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 *
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 * @return ASCII code of pressed key or 0 if no key pressed.
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 */
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static int32_t ski_getchar(void)
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{
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    uint64_t ch;
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    asm volatile (
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        "mov r15 = %1\n"
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        "break 0x80000;;\n" /* modifies r8 */
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        "mov %0 = r8;;\n"      
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        : "=r" (ch)
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        : "i" (SKI_GETCHAR)
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        : "r15", "r8"
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    );
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    return (int32_t) ch;
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}
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/** @}
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 */