209 lines
4.6 KiB
C
209 lines
4.6 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"); you may not
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* use this file except in compliance with the License. You may obtain a copy
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* 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* 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/stdlib.h>
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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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#include <asm/processor.h>
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#include <asm/io.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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#define NO_EARLY_PRINT 0
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#define VGA_EARLY_PRINT 1
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#define UART_EARLY_PRINT 2
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#ifdef CONFIG_VGA
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static uint32_t early_print = VGA_EARLY_PRINT;
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#elif defined(CONFIG_UART)
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static uint32_t early_print = UART_EARLY_PRINT;
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#else
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static uint32_t early_print = NO_EARLY_PRINT;
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#endif
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static spinlock_irqsave_t olock = SPINLOCK_IRQSAVE_INIT;
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static atomic_int32_t kmsg_counter = ATOMIC_INIT(0);
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static unsigned char kmessages[KMSG_SIZE] __attribute__ ((section(".kmsg"))) = {[0 ... KMSG_SIZE-1] = 0x00};
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static ssize_t kmsg_read(fildes_t* file, uint8_t* buffer, size_t size)
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{
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size_t start, i = 0;
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if (BUILTIN_EXPECT(!buffer, 0))
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return -EINVAL;
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if (BUILTIN_EXPECT(!size, 0))
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return 0;
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if (kmessages[(atomic_int32_read(&kmsg_counter) + 1) % KMSG_SIZE] == 0)
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start = 0;
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else
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start = (atomic_int32_read(&kmsg_counter) + 1) % KMSG_SIZE;
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if (((start + file->offset) % KMSG_SIZE) == atomic_int32_read(&kmsg_counter))
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return 0;
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if (file->offset >= KMSG_SIZE)
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return 0;
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for(i=0; i<size; i++, file->offset++) {
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buffer[i] = kmessages[(start + file->offset) % KMSG_SIZE];
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if (((start + file->offset) % KMSG_SIZE) == atomic_int32_read(&kmsg_counter))
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return i;
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}
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return size;
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}
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static int kmsg_open(fildes_t* file, const char *name)
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{
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return 0;
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}
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static int kmsg_close(fildes_t* file)
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{
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return 0;
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}
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/* Init Functions */
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int kmsg_init(vfs_node_t * node, const char *name)
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{
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uint32_t i, j;
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vfs_node_t* new_node;
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dir_block_t* blockdir;
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dirent_t* dirent;
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block_list_t* blist;
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if (BUILTIN_EXPECT(!node || !name, 0))
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return -EINVAL;
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if (BUILTIN_EXPECT(node->type != FS_DIRECTORY, 0))
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return -EINVAL;
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if (finddir_fs(node, name))
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return -EINVAL;
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new_node = kmalloc(sizeof(vfs_node_t));
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if (BUILTIN_EXPECT(!new_node, 0))
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return -ENOMEM;
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memset(new_node, 0x00, sizeof(vfs_node_t));
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new_node->type = FS_CHARDEVICE;
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new_node->open = &kmsg_open;
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new_node->close = &kmsg_close;
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new_node->read = &kmsg_read;
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new_node->write = NULL;
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spinlock_init(&new_node->lock);
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blist = &node->block_list;
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do {
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for (i = 0; i < MAX_DATABLOCKS; i++) {
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if (blist->data[i]) {
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blockdir = (dir_block_t *) blist->data[i];
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for (j = 0; j < MAX_DIRENTRIES; j++) {
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dirent = &blockdir->entries[j];
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if (!dirent->vfs_node) {
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dirent->vfs_node = new_node;
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strncpy(dirent->name, name, MAX_FNAME);
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return 0;
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}
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}
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}
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}
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if (!blist->next) {
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blist->next = (block_list_t *) kmalloc(sizeof(block_list_t));
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if (blist->next)
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memset(blist->next, 0x00, sizeof(block_list_t));
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}
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} while (blist);
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kfree(new_node, sizeof(vfs_node_t));
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return -ENOMEM;
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}
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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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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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if (early_print != NO_EARLY_PRINT)
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spinlock_irqsave_lock(&olock);
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pos = atomic_int32_inc(&kmsg_counter);
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kmessages[pos % KMSG_SIZE] = (unsigned char) c;
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#ifdef CONFIG_VGA
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if (early_print == VGA_EARLY_PRINT)
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vga_putchar(c);
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#endif
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#ifdef CONFIG_UART
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if (early_print == UART_EARLY_PRINT)
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uart_putchar(c);
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#endif
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if (early_print != NO_EARLY_PRINT)
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spinlock_irqsave_unlock(&olock);
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return 1;
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}
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int kputs(const char *str)
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{
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int pos, i;
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if (early_print != NO_EARLY_PRINT)
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spinlock_irqsave_lock(&olock);
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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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if (early_print == VGA_EARLY_PRINT)
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vga_putchar(str[i]);
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#endif
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#ifdef CONFIG_UART
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if (early_print == UART_EARLY_PRINT)
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uart_putchar(str[i]);
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#endif
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}
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if (early_print != NO_EARLY_PRINT)
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spinlock_irqsave_unlock(&olock);
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return i;
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}
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int kflush(void)
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{
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flush_cache();
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return 0;
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}
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