6f2bc1ccc8
git-svn-id: http://svn.lfbs.rwth-aachen.de/svn/scc/trunk/MetalSVM@44 315a16e6-25f9-4109-90ae-ca3045a26c18
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
/*
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* Copyright 2010 Stefan Lankes, Chair for Operating Systems,
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* RWTH Aachen University
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of MetalSVM.
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*/
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#include <metalsvm/stdio.h>
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#include <metalsvm/string.h>
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#include <metalsvm/stdarg.h>
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#include <metalsvm/spinlocks.h>
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#ifdef CONFIG_VGA
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#include <asm/vga.h>
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#endif
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static unsigned int kmsg_counter = 0;
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static unsigned char kmessages[KMSG_SIZE];
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static spinlock_t kio_lock = SPINLOCK_INIT;
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int koutput_init(void)
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{
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#ifdef CONFIG_VGA
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vga_init();
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#endif
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memset(kmessages, 0, sizeof(unsigned char)*KMSG_SIZE);
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return 0;
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}
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int kputchar(int c)
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{
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int ret = 1;
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spinlock_lock(&kio_lock);
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kmessages[kmsg_counter++ % KMSG_SIZE] = c;
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#ifdef CONFIG_VGA
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ret = vga_putchar(c);
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#endif
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spinlock_unlock(&kio_lock);
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return ret;
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}
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int kputs(const char *str)
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{
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int i;
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spinlock_lock(&kio_lock);
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for(i=0; str[i] != '\0'; i++)
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kmessages[kmsg_counter++ % KMSG_SIZE] = str[i];
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#ifdef CONFIG_VGA
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i = vga_puts(str);
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#endif
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spinlock_unlock(&kio_lock);
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return i;
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}
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