Exemple #1
0
static int serial_mount_devices(void) {

	fs_node_t * ttyS0 = serial_device_create(SERIAL_PORT_A);
	vfs_mount("/dev/ttyS0", ttyS0);

	fs_node_t * ttyS1 = serial_device_create(SERIAL_PORT_B);
	vfs_mount("/dev/ttyS1", ttyS1);

	fs_node_t * ttyS2 = serial_device_create(SERIAL_PORT_C);
	vfs_mount("/dev/ttyS2", ttyS2);

	fs_node_t * ttyS3 = serial_device_create(SERIAL_PORT_D);
	vfs_mount("/dev/ttyS3", ttyS3);

	char * c;
	if ((c = args_value("logtoserial"))) {
		debug_file = ttyS0;
		debug_level = atoi(c);
		debug_print(NOTICE, "Serial logging enabled at level %d.", debug_level);
	}


	return 0;
}
Exemple #2
0
/*
 * multiboot i386 (pc) kernel entry point
 */
int kmain(struct multiboot *mboot, uint32_t mboot_mag, uintptr_t esp) {
	initial_esp = esp;
	extern char * cmdline;

	uint32_t mboot_mods_count = 0;
	mboot_mod_t * mboot_mods = NULL;
	mboot_ptr = mboot;

	ENABLE_EARLY_BOOT_LOG(0);

	assert(mboot_mag == MULTIBOOT_EAX_MAGIC && "Didn't boot with multiboot, not sure how we got here.");
	debug_print(NOTICE, "Processing Multiboot information.");

	/* Initialize core modules */
	gdt_install();      /* Global descriptor table */
	idt_install();      /* IDT */
	isrs_install();     /* Interrupt service requests */
	irq_install();      /* Hardware interrupt requests */

	if (mboot_ptr->flags & (1 << 3)) {
		debug_print(NOTICE, "There %s %d module%s starting at 0x%x.", mboot_ptr->mods_count == 1 ? "is" : "are", mboot_ptr->mods_count, mboot_ptr->mods_count == 1 ? "" : "s", mboot_ptr->mods_addr);
		debug_print(NOTICE, "Current kernel heap start point would be 0x%x.", &end);
		if (mboot_ptr->mods_count > 0) {
			uintptr_t last_mod = (uintptr_t)&end;
			uint32_t i;
			mboot_mods = (mboot_mod_t *)mboot_ptr->mods_addr;
			mboot_mods_count = mboot_ptr->mods_count;
			for (i = 0; i < mboot_ptr->mods_count; ++i ) {
				mboot_mod_t * mod = &mboot_mods[i];
				uint32_t module_start = mod->mod_start;
				uint32_t module_end   = mod->mod_end;
				if ((uintptr_t)mod + sizeof(mboot_mod_t) > last_mod) {
					/* Just in case some silly person put this *behind* the modules... */
					last_mod = (uintptr_t)mod + sizeof(mboot_mod_t);
				}
				debug_print(NOTICE, "Module %d is at 0x%x:0x%x", i, module_start, module_end);
				if (last_mod < module_end) {
					last_mod = module_end;
				}
			}
			debug_print(NOTICE, "Moving kernel heap start to 0x%x", last_mod);
			kmalloc_startat(last_mod);
		}
	}

	paging_install(mboot_ptr->mem_upper + mboot_ptr->mem_lower);
	if (mboot_ptr->flags & (1 << 6)) {
		debug_print(NOTICE, "Parsing memory map.");
		mboot_memmap_t * mmap = (void *)mboot_ptr->mmap_addr;
		while ((uintptr_t)mmap < mboot_ptr->mmap_addr + mboot_ptr->mmap_length) {
			if (mmap->type == 2) {
				for (unsigned long long int i = 0; i < mmap->length; i += 0x1000) {
					if (mmap->base_addr + i > 0xFFFFFFFF) break; /* xxx */
					debug_print(INFO, "Marking 0x%x", (uint32_t)(mmap->base_addr + i));
					paging_mark_system((mmap->base_addr + i) & 0xFFFFF000);
				}
			}
			mmap = (mboot_memmap_t *) ((uintptr_t)mmap + mmap->size + sizeof(uintptr_t));
		}
	}
	paging_finalize();

	{
		char cmdline_[1024];

		size_t len = strlen((char *)mboot_ptr->cmdline);
		memmove(cmdline_, (char *)mboot_ptr->cmdline, len + 1);

		/* Relocate the command line */
		cmdline = (char *)kmalloc(len + 1);
		memcpy(cmdline, cmdline_, len + 1);
	}

	/* Memory management */
	heap_install();     /* Kernel heap */

	if (cmdline) {
		args_parse(cmdline);
	}

	vfs_install();
	tasking_install();  /* Multi-tasking */
	timer_install();    /* PIC driver */
	fpu_install();      /* FPU/SSE magic */
	syscalls_install(); /* Install the system calls */
	shm_install();      /* Install shared memory */
	modules_install();  /* Modules! */

	DISABLE_EARLY_BOOT_LOG();

	/* Load modules from bootloader */
	debug_print(NOTICE, "%d modules to load", mboot_mods_count);
	for (unsigned int i = 0; i < mboot_ptr->mods_count; ++i ) {
		mboot_mod_t * mod = &mboot_mods[i];
		uint32_t module_start = mod->mod_start;
		uint32_t module_end = mod->mod_end;
		size_t   module_size = module_end - module_start;

		if (!module_quickcheck((void *)module_start)) {
			debug_print(NOTICE, "Loading ramdisk: 0x%x:0x%x", module_start, module_end);
			ramdisk_mount(module_start, module_size);
		} else {

			debug_print(NOTICE, "Loading a module: 0x%x:0x%x", module_start, module_end);
			module_data_t * mod_info = (module_data_t *)module_load_direct((void *)(module_start), module_size);
			if (mod_info) {
				debug_print(NOTICE, "Loaded: %s", mod_info->mod_info->name);
			}
		}
	}

	/* Map /dev to a device mapper */
	map_vfs_directory("/dev");

	if (args_present("root")) {
		vfs_mount_type("ext2", args_value("root"), "/");
	}

	if (args_present("start")) {
		char * c = args_value("start");
		if (!c) {
			debug_print(WARNING, "Expected an argument to kernel option `start`. Ignoring.");
		} else {
			debug_print(NOTICE, "Got start argument: %s", c);
			boot_arg = strdup(c);
		}
	}

	if (!fs_root) {
		debug_print(CRITICAL, "No root filesystem is mounted. Skipping init.");
		map_vfs_directory("/");
		switch_task(0);
	}

	/* Prepare to run /bin/init */
	char * argv[] = {
		"/bin/init",
		boot_arg,
		NULL
	};
	int argc = 0;
	while (argv[argc]) {
		argc++;
	}
	system(argv[0], argc, argv); /* Run init */

	return 0;
}