source: mainline/kernel/arch/ia64/src/drivers/ski.c@ a000878c

/*
 * Copyright (c) 2005 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 ia64
 * @{
 */
/** @file
 */

#include <arch/drivers/ski.h>
#include <console/console.h>
#include <console/chardev.h>
#include <sysinfo/sysinfo.h>
#include <arch/types.h>
#include <proc/thread.h>
#include <synch/spinlock.h>
#include <arch/asm.h>
#include <arch/drivers/kbd.h>
#include <string.h>
#include <arch.h>

enum {
        /** Interval between polling in microseconds */
        POLL_INTERVAL = 10000,  /* 0.01 s */
        
        /** Max. number of characters to pull out at a time */
        POLL_LIMIT = 30,
        
        SKI_INIT_CONSOLE = 20,
        SKI_GETCHAR      = 21,
        SKI_PUTCHAR      = 31
};

static void ski_putchar(outdev_t *, const wchar_t, bool);

static outdev_operations_t skidev_ops = {
        .write = ski_putchar,
        .redraw = NULL
};

static ski_instance_t *instance = NULL;

/** Ask debug console if a key was pressed.
 *
 * Use SSC (Simulator System Call) to
 * get character from debug console.
 *
 * This call is non-blocking.
 *
 * @return ASCII code of pressed key or 0 if no key pressed.
 *
 */
static wchar_t ski_getchar(void)
{
        uint64_t ch;
        
        asm volatile (
                "mov r15 = %1\n"
                "break 0x80000;;\n"  /* modifies r8 */
                "mov %0 = r8;;\n"
                
                : "=r" (ch)
                : "i" (SKI_GETCHAR)
                : "r15", "r8"
        );
        
        return (wchar_t) ch;
}

/** Ask keyboard if a key was pressed.
 *
 * If so, it will repeat and pull up to POLL_LIMIT characters.
 */
static void poll_keyboard(ski_instance_t *instance)
{
        if (silent)
                return;
        
        int count = POLL_LIMIT;
        
        while (count > 0) {
                wchar_t ch = ski_getchar();
                
                if (ch == '\0')
                        break;
                
                indev_push_character(instance->srlnin, ch);
                --count;
        }
}

/** Kernel thread for polling keyboard. */
static void kskipoll(void *arg)
{
        ski_instance_t *instance = (ski_instance_t *) arg;
        
        while (true) {
                if (!silent)
                        poll_keyboard(instance);
                
                thread_usleep(POLL_INTERVAL);
        }
}

/** Initialize debug console
 *
 * Issue SSC (Simulator System Call) to
 * to open debug console.
 *
 */
static void ski_init(void)
{
        if (instance)
                return;
        
        asm volatile (
                "mov r15 = %0\n"
                "break 0x80000\n"
                :
                : "i" (SKI_INIT_CONSOLE)
                : "r15", "r8"
        );
        
        instance = malloc(sizeof(ski_instance_t), FRAME_ATOMIC);
        
        if (instance) {
                instance->thread = thread_create(kskipoll, instance, TASK, 0,
                    "kskipoll", true);
                
                if (!instance->thread) {
                        free(instance);
                        instance = NULL;
                        return;
                }
                
                instance->srlnin = NULL;
        }
}

static void ski_do_putchar(const wchar_t ch)
{
        asm volatile (
                "mov r15 = %[cmd]\n"
                "mov r32 = %[ch]\n"   /* r32 is in0 */
                "break 0x80000\n"     /* modifies r8 */
                :
                : [cmd] "i" (SKI_PUTCHAR), [ch] "r" (ch)
                : "r15", "in0", "r8"
        );
}

/** Display character on debug console
 *
 * Use SSC (Simulator System Call) to
 * display character on debug console.
 *
 * @param dev    Character device.
 * @param ch     Character to be printed.
 * @param silent Whether the output should be silenced.
 *
 */
static void ski_putchar(outdev_t *dev, const wchar_t ch, bool silent)
{
        if (!silent) {
                if (ascii_check(ch)) {
                        if (ch == '\n')
                                ski_do_putchar('\r');
                        
                        ski_do_putchar(ch);
                } else
                        ski_do_putchar(U_SPECIAL);
        }
}

outdev_t *skiout_init(void)
{
        ski_init();
        if (!instance)
                return NULL;
        
        outdev_t *skidev = malloc(sizeof(outdev_t), FRAME_ATOMIC);
        if (!skidev)
                return NULL;
        
        outdev_initialize("skidev", skidev, &skidev_ops);
        skidev->data = instance;
        
        if (!fb_exported) {
                /*
                 * This is the necessary evil until the userspace driver is entirely
                 * self-sufficient.
                 */
                sysinfo_set_item_val("fb", NULL, false);
                
                fb_exported = true;
        }
        
        return skidev;
}

ski_instance_t *skiin_init(void)
{
        ski_init();
        return instance;
}

void skiin_wire(ski_instance_t *instance, indev_t *srlnin)
{
        ASSERT(instance);
        ASSERT(srlnin);
        
        instance->srlnin = srlnin;
        thread_ready(instance->thread);
        
        sysinfo_set_item_val("kbd", NULL, true);
        sysinfo_set_item_val("kbd.type", NULL, KBD_SKI);
}

/** @}
 */