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kernel.c
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kernel.c
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/*
* Copyright (C) 2009 Renê de Souza Pinto
* Tempos - Tempos is an Educational and multi purpose Operating System
*
* File: kernel.c
* Desc: The TempOS kernel
*
* This file is part of TempOS.
*
* TempOS is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* TempOS is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <tempos/kernel.h>
#include <tempos/mm.h>
#include <tempos/timer.h>
#include <tempos/jiffies.h>
#include <tempos/delay.h>
#include <tempos/sched.h>
#include <tempos/wait.h>
#include <drv/i8042.h>
#include <drv/ata_generic.h>
#include <drv/serial.h>
#include <fs/vfs.h>
#include <fs/device.h>
#include <string.h>
#include <stdlib.h>
#include <linkedl.h>
#include <semaphore.h>
/** information passed from first stage */
karch_t kinfo;
/** kernel main thread */
void kernel_main_thread(void *arg);
/** idle thread */
void idle_thread(void *arg);
/** Console serial flag */
char console_over_serial = 0;
/** Console serial strucutre */
struct serial_interface tty_serial;
/** indicates when idle_thread should exit */
static int thread_done = 0;
/**
* tempos_main : Second stage
*
* This is the function called when first stage is done, which means that
* all dependent machine boot code was executed. See arch/$ARCH/boot/karch.c
*/
void tempos_main(karch_t kinf)
{
memcpy(&kinfo, &kinf, sizeof(karch_t));
/* keep init_timer() in first place because drivers use timer functions */
init_timer();
calibrate_delay();
/* Keyboard */
init_8042();
/* Initialize wait queues */
init_wait_queues();
/* Initialize the scheduler */
init_scheduler(kernel_main_thread);
/* Should never reaches here! */
panic("Error on initialize scheduler!");
}
void thread1(void *arg)
{
int *t = (int*)arg;
kprintf("Hello World! %x\n", t);
mdelay(4000);
kernel_thread_exit(0);
}
/**
* This is the main kernel thread. When TempOS initializes his scheduler
* the kernel process becomes a kernel thread (running this function). So
* this thread executes all functions after scheduler initialization.
*
* \param arg Not used.
*/
void kernel_main_thread(void *arg)
{
char rdev_str[10], *rstr, *init;
dev_t rootdev;
size_t i, rdev_len;
/* NOTE: keep calling order for the functions below */
/* Create idle thread */
kernel_thread_create(DEFAULT_PRIORITY, idle_thread, NULL);
/* Initialize Virtual File System layer */
register_all_fs_types();
/* Initialize PID numbers */
init_pids();
/* ATA controller */
init_ata_generic();
/* Show and parse command line */
kprintf(KERN_INFO "Kernel command line: %s\n", kinfo.cmdline);
parse_cmdline((char*)kinfo.cmdline);
/* Check for serial console */
rstr = cmdline_get_value("console");
if (rstr != NULL) {
if (strcmp(rstr, "ttyS0") == 0) {
if (serial_init(&tty_serial, SERIAL_CONSOLE_BAUD)) {
panic("Failed to init serial driver!");
} else {
console_over_serial = 1;
kprintf("Serial console initialized on ttyS0!\n");
}
}
}
/* Mount root file system */
memset(&rootdev, 0, sizeof(rootdev));
rstr = cmdline_get_value("root");
strcpy(rdev_str, rstr);
rdev_len = strlen(rstr);
rdev_str[rdev_len] = '\0';
for (i = 0; i < rdev_len; i++) {
if (rdev_str[i] == ':') {
rdev_str[i] = '\0';
rootdev.major = atoi(rdev_str);
rootdev.minor = atoi(&rdev_str[i+1]);
break;
}
}
if (i == rdev_len) {
panic("Kernel command line root argument bad formated.");
}
if ( !vfs_mount_root(rootdev) ) {
panic("VFS ERROR: Could not mount root file system.");
}
/* Load init */
init = cmdline_get_value("init");
if (init == NULL) {
init = DEFAULT_INIT_PROCCESS;
}
kprintf("Loading %s...\n", init);
/* Load init */
vfs_inode *arq = vfs_namei(init);
vfs_bmap_t bk;
if (arq == NULL) {
kprintf(KERN_DEBUG "%s: not found!\n", init);
panic("init file not found!\n");
}
size_t fblocks = (arq->i_size / arq->sb->s_log_block_size);
if ((arq->i_size % arq->sb->s_log_block_size) != 0) fblocks++;
char *blocks = kmalloc(fblocks*arq->sb->s_log_block_size, GFP_NORMAL_Z);
char *blk;
size_t pos = 0;
for (i = 0; i < fblocks; i++) {
bk = vfs_bmap(arq, pos);
blk = arq->sb->sb_op->get_fs_block(arq->sb, bk.blk_number);
memcpy(&blocks[pos], blk, arq->sb->s_log_block_size);
pos += arq->sb->s_log_block_size;
}
_exec_init(blocks, arq->i_size);
/* TEST: Read root directory */
/*kprintf("DEBUG:\n");
vfs_inode *root = vfs_namei("/");
if ( !(root->i_mode & S_IFDIR) ) {
panic("Not dir.");
}
char *block = root->sb->sb_op->get_fs_block(root->sb, root->i_block[0]);
vfs_directory dir;
int pos = 0;
int newpos = 0;
kprintf("/: %ld\n", root->i_size);
while(1) {
memcpy(&dir.inode, &block[pos], sizeof(uint32_t));
if (dir.inode == 0) {
break;
} else {
pos += sizeof(uint32_t);
}
memcpy(&dir.rec_len, &block[pos], sizeof(uint16_t));
pos += sizeof(uint16_t);
memcpy(&dir.name_len, &block[pos], sizeof(uchar8_t));
pos += 2 * sizeof(uchar8_t);
memcpy(&dir.name[0], &block[pos], dir.name_len);
dir.name[dir.name_len] = '\0';
newpos += dir.rec_len;
pos = newpos;
kprintf("%.8ld|", dir.inode);
kprintf("|%ld\n", dir.rec_len);
kprintf("|%ld\n", dir.name_len);
kprintf("%s\n", dir.name);
}
kfree(block);
vfs_inode *arq = vfs_namei("/test.txt");
vfs_inode *arq = vfs_namei("/test2.txt");
vfs_inode *arq = vfs_iget(root->sb, 12);
vfs_inode *arq = vfs_iget(root->sb, 14);
vfs_bmap_t bk = vfs_bmap(arq, 12298);
vfs_bmap_t bk = vfs_bmap(arq, 274442);
vfs_bmap_t bk = vfs_bmap(arq, 67384320);
*/
/*pid_t pid = _fork(GET_TASK(cur_task));
if (pid != 0) {
kprintf("Eu sou o PAI!\n");
while(1) {
kprintf("PAI: %d\n", pid);
mdelay(500);
}
} else {
kprintf("Eu sou o Filho!\n");
while(1) {
kprintf("Filho: %d\n", GET_TASK(cur_task)->pid);
mdelay(500);
}
}*/
/*task_t *th1 = kernel_thread_create(DEFAULT_PRIORITY, thread1, (void*)0x24);
kernel_thread_wait(th1);
kprintf("Acordei!\n");*/
/* fork thread */
/* call execve_init */
/**
* We are done. User process "init" is running, now
* idle_thread can go away...
*/
/* thread_done = 1; */
for(;;) {
/* measure system load */
mdelay(5000);
kprintf("Kernel thread: idle\n");
}
/* tests */
/*buff_header_t *buff;
buff = bread(3, 1, 368);
for (i = 0; i < 512; i++) {
kprintf("%c ", buff->data[i]);
}*/
/*getblk(3, 0, 24);
getblk(3, 0, 4);
getblk(3, 0, 8);
getblk(3, 0, 16);
getblk(3, 0, 24);
kprintf(KERN_INFO "Hello, I'm the main kernel process!\n"); */
/*new_alarm(jiffies + (3 * HZ), test, 2);*/
/* Call a system call */
/*char *hello = "Hello World!\n";
asm("movl $4, %%eax \n" // syscall number
"movl $13, %%ebx \n" // count
"movl %0, %%ecx \n" // hello
"movl $0, %%edx \n" // fd
"pushl %%eax\n"
"int $0x85" : : "g" (hello) : "eax", "ebx", "ecx", "edx");
kprintf(KERN_INFO "\nI'am back from syscall!!\n");*/
/*
kprintf(KERN_INFO "\n1 ");
mdelay(1000);
kprintf(KERN_INFO "2 ");
mdelay(1000);
kprintf(KERN_INFO "3 ");*/
}
/**
* This function does nothing.
* \note This function will run as a kernel thread just to keep another
* process running when the main kernel thread goes to sleep
* at system initialization, when there is no user process running yet.
*
* \param arg Not used.
*/
void idle_thread(void *arg)
{
while(!thread_done);
kernel_thread_exit(0);
}
/**
* Show error message and dump halt CPU.
* This function should be used when something goes really wrong.
* System will hang out without any chance of recovery.
*
* \param format Error message (formated).
*/
void panic(const char *format, ...)
{
char str[MAX_KPRINTF_SIZE];
va_list args;
va_start(args, format);
vsprintf(str, format, args);
va_end(args);
kprintf(KERN_CRIT "\nPANIC: %s\n", str);
halt_cpu();
for(;;);
}