rtas.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 624 行 · 第 1/2 页

		if (rc == RTAS_BUSY)
			udelay(1);
		else if (rtas_is_extended_busy(rc)) {
			wait_time = rtas_extended_busy_delay_time(rc);
			udelay(wait_time * 1000);
		}
		else
			break;
	}

	return rc;
}

#define FLASH_BLOCK_LIST_VERSION (1UL)
static void
rtas_flash_firmware(void)
{
	unsigned long image_size;
	struct flash_block_list *f, *next, *flist;
	unsigned long rtas_block_list;
	int i, status, update_token;

	update_token = rtas_token("ibm,update-flash-64-and-reboot");
	if (update_token == RTAS_UNKNOWN_SERVICE) {
		printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot is not available -- not a service partition?\n");
		printk(KERN_ALERT "FLASH: firmware will not be flashed\n");
		return;
	}

	/* NOTE: the "first" block list is a global var with no data
	 * blocks in the kernel data segment.  We do this because
	 * we want to ensure this block_list addr is under 4GB.
	 */
	rtas_firmware_flash_list.num_blocks = 0;
	flist = (struct flash_block_list *)&rtas_firmware_flash_list;
	rtas_block_list = virt_to_abs(flist);
	if (rtas_block_list >= 4UL*1024*1024*1024) {
		printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n");
		return;
	}

	printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n");
	/* Update the block_list in place. */
	image_size = 0;
	for (f = flist; f; f = next) {
		/* Translate data addrs to absolute */
		for (i = 0; i < f->num_blocks; i++) {
			f->blocks[i].data = (char *)virt_to_abs(f->blocks[i].data);
			image_size += f->blocks[i].length;
		}
		next = f->next;
		/* Don't translate NULL pointer for last entry */
		if (f->next)
			f->next = (struct flash_block_list *)virt_to_abs(f->next);
		else
			f->next = NULL;
		/* make num_blocks into the version/length field */
		f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16);
	}

	printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size);
	printk(KERN_ALERT "FLASH: performing flash and reboot\n");
	ppc_md.progress("Flashing        \n", 0x0);
	ppc_md.progress("Please Wait...  ", 0x0);
	printk(KERN_ALERT "FLASH: this will take several minutes.  Do not power off!\n");
	status = rtas_call(update_token, 1, 1, NULL, rtas_block_list);
	switch (status) {	/* should only get "bad" status */
	    case 0:
		printk(KERN_ALERT "FLASH: success\n");
		break;
	    case -1:
		printk(KERN_ALERT "FLASH: hardware error.  Firmware may not be not flashed\n");
		break;
	    case -3:
		printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform.  Firmware not flashed\n");
		break;
	    case -4:
		printk(KERN_ALERT "FLASH: flash failed when partially complete.  System may not reboot\n");
		break;
	    default:
		printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status);
		break;
	}
}

void rtas_flash_bypass_warning(void)
{
	printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n");
	printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n");
}


void
rtas_restart(char *cmd)
{
	if (rtas_firmware_flash_list.next)
		rtas_flash_firmware();

	printk("RTAS system-reboot returned %d\n",
	       rtas_call(rtas_token("system-reboot"), 0, 1, NULL));
	for (;;);
}

void
rtas_power_off(void)
{
	if (rtas_firmware_flash_list.next)
		rtas_flash_bypass_warning();
	/* allow power on only with power button press */
	printk("RTAS power-off returned %d\n",
	       rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1));
	for (;;);
}

void
rtas_halt(void)
{
	if (rtas_firmware_flash_list.next)
		rtas_flash_bypass_warning();
	rtas_power_off();
}

/* Must be in the RMO region, so we place it here */
static char rtas_os_term_buf[2048];

void rtas_os_term(char *str)
{
	int status;

	snprintf(rtas_os_term_buf, 2048, "OS panic: %s", str);

	do {
		status = rtas_call(rtas_token("ibm,os-term"), 1, 1, NULL,
				   __pa(rtas_os_term_buf));

		if (status == RTAS_BUSY)
			udelay(1);
		else if (status != 0)
			printk(KERN_EMERG "ibm,os-term call failed %d\n",
			       status);
	} while (status == RTAS_BUSY);
}


asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
{
	struct rtas_args args;
	unsigned long flags;
	char * buff_copy;
	int nargs;
	int err_rc = 0;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (copy_from_user(&args, uargs, 3 * sizeof(u32)) != 0)
		return -EFAULT;

	nargs = args.nargs;
	if (nargs > ARRAY_SIZE(args.args)
	    || args.nret > ARRAY_SIZE(args.args)
	    || nargs + args.nret > ARRAY_SIZE(args.args))
		return -EINVAL;

	/* Copy in args. */
	if (copy_from_user(args.args, uargs->args,
			   nargs * sizeof(rtas_arg_t)) != 0)
		return -EFAULT;

	buff_copy = kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL);

	spin_lock_irqsave(&rtas.lock, flags);

	rtas.args = args;
	enter_rtas(__pa(&rtas.args));
	args = rtas.args;

	args.rets = &args.args[nargs];

	/* A -1 return code indicates that the last command couldn't
	   be completed due to a hardware error. */
	if (args.rets[0] == -1) {
		err_rc = __fetch_rtas_last_error();
		if ((err_rc == 0) && buff_copy) {
			memcpy(buff_copy, rtas_err_buf, RTAS_ERROR_LOG_MAX);
		}
	}

	spin_unlock_irqrestore(&rtas.lock, flags);

	if (buff_copy) {
		if ((args.rets[0] == -1) && (err_rc == 0)) {
			log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0);
		}
		kfree(buff_copy);
	}

	/* Copy out args. */
	if (copy_to_user(uargs->args + nargs,
			 args.args + nargs,
			 args.nret * sizeof(rtas_arg_t)) != 0)
		return -EFAULT;

	return 0;
}

#ifdef CONFIG_HOTPLUG_CPU
/* This version can't take the spinlock, because it never returns */

struct rtas_args rtas_stop_self_args = {
	/* The token is initialized for real in setup_system() */
	.token = RTAS_UNKNOWN_SERVICE,
	.nargs = 0,
	.nret = 1,
	.rets = &rtas_stop_self_args.args[0],
};

void rtas_stop_self(void)
{
	struct rtas_args *rtas_args = &rtas_stop_self_args;

	local_irq_disable();

	BUG_ON(rtas_args->token == RTAS_UNKNOWN_SERVICE);

	printk("cpu %u (hwid %u) Ready to die...\n",
	       smp_processor_id(), hard_smp_processor_id());
	enter_rtas(__pa(rtas_args));

	panic("Alas, I survived.\n");
}
#endif /* CONFIG_HOTPLUG_CPU */

/*
 * Return the firmware-specified size of the error log buffer
 *  for all rtas calls that require an error buffer argument.
 *  This includes 'check-exception' and 'rtas-last-error'.
 */
int rtas_get_error_log_max(void)
{
	static int rtas_error_log_max;
	if (rtas_error_log_max)
		return rtas_error_log_max;

	rtas_error_log_max = rtas_token ("rtas-error-log-max");
	if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) ||
	    (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) {
		printk (KERN_WARNING "RTAS: bad log buffer size %d\n", rtas_error_log_max);
		rtas_error_log_max = RTAS_ERROR_LOG_MAX;
	}
	return rtas_error_log_max;
}

/*
 * Call early during boot, before mem init or bootmem, to retreive the RTAS
 * informations from the device-tree and allocate the RMO buffer for userland
 * accesses.
 */
void __init rtas_initialize(void)
{
	/* Get RTAS dev node and fill up our "rtas" structure with infos
	 * about it.
	 */
	rtas.dev = of_find_node_by_name(NULL, "rtas");
	if (rtas.dev) {
		u64 *basep, *entryp;
		u32 *sizep;

		basep = (u64 *)get_property(of_chosen, "linux,rtas-base", NULL);
		sizep = (u32 *)get_property(of_chosen, "linux,rtas-size", NULL);
		if (basep != NULL && sizep != NULL) {
			rtas.base = *basep;
			rtas.size = *sizep;
			entryp = (u64 *)get_property(of_chosen, "linux,rtas-entry", NULL);
			if (entryp == NULL) /* Ugh */
				rtas.entry = rtas.base;
			else
				rtas.entry = *entryp;
		} else
			rtas.dev = NULL;
	}
	/* If RTAS was found, allocate the RMO buffer for it and look for
	 * the stop-self token if any
	 */
	if (rtas.dev) {
		unsigned long rtas_region = RTAS_INSTANTIATE_MAX;
		if (systemcfg->platform == PLATFORM_PSERIES_LPAR)
			rtas_region = min(lmb.rmo_size, RTAS_INSTANTIATE_MAX);

		rtas_rmo_buf = lmb_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE,
							rtas_region);

#ifdef CONFIG_HOTPLUG_CPU
		rtas_stop_self_args.token = rtas_token("stop-self");
#endif /* CONFIG_HOTPLUG_CPU */
	}

}


EXPORT_SYMBOL(rtas_firmware_flash_list);
EXPORT_SYMBOL(rtas_token);
EXPORT_SYMBOL(rtas_call);
EXPORT_SYMBOL(rtas_data_buf);
EXPORT_SYMBOL(rtas_data_buf_lock);
EXPORT_SYMBOL(rtas_extended_busy_delay_time);
EXPORT_SYMBOL(rtas_get_sensor);
EXPORT_SYMBOL(rtas_get_power_level);
EXPORT_SYMBOL(rtas_set_power_level);
EXPORT_SYMBOL(rtas_set_indicator);
EXPORT_SYMBOL(rtas_get_error_log_max);