/*
* 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.
*/
#include <arch/ski.h>
#include <stdbool.h>
#include <stddef.h>
#define SKI_INIT_CONSOLE 20
#define SKI_PUTCHAR 31
static void ski_console_init(void)
{
static bool initialized = false;
if (initialized)
return;
asm volatile (
"mov r15 = %[cmd]\n"
"break 0x80000\n"
:
: [cmd] "i" (SKI_INIT_CONSOLE)
: "r15", "r8"
);
initialized = true;
}
void ski_putchar(char ch)
{
ski_console_init();
if (ch == '\n')
ski_putchar('\r');
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"
);
}