311b32aef8
- create a special process which reads the kernel messages from a buffer and dump them on the screen git-svn-id: http://svn.lfbs.rwth-aachen.de/svn/scc/trunk/MetalSVM@51 315a16e6-25f9-4109-90ae-ca3045a26c18
90 lines
1.8 KiB
C
90 lines
1.8 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/tasks.h>
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#include <metalsvm/semaphore.h>
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#include <asm/atomic.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 atomic_int32_t kmsg_counter = ATOMIC_INIT(0);
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static unsigned char kmessages[KMSG_SIZE] = {[0 ... KMSG_SIZE-1] = 0};
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#ifdef CONFIG_VGA
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static sem_t sem_output = SEM_INIT(0);
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static int STDCALL output_task(void* arg)
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{
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uint32_t rpos = 0;
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do {
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sem_wait(&sem_output);
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vga_putchar((int) kmessages[rpos]);
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rpos = (rpos + 1) % KMSG_SIZE;
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} while(1);
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return 0;
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}
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#endif
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int koutput_init(void)
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{
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#ifdef CONFIG_VGA
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tid_t id;
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vga_init();
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create_kernel_task(&id, output_task, NULL);
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#endif
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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 pos;
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int ret = 1;
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pos = atomic_int32_inc(&kmsg_counter);
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kmessages[pos % KMSG_SIZE] = c;
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#ifdef CONFIG_VGA
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sem_post(&sem_output);
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#endif
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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 pos;
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int i;
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for(i=0; str[i] != '\0'; i++) {
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pos = atomic_int32_inc(&kmsg_counter);
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kmessages[pos % KMSG_SIZE] = str[i];
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#ifdef CONFIG_VGA
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sem_post(&sem_output);
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#endif
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}
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return i;
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}
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