3  * Procedures for interfacing to the RTAS on CHRP machines.
32 #include <asm/rtas.h>
51 struct rtas_t rtas = {  variable
54 EXPORT_SYMBOL(rtas);
71 /* RTAS use home made raw locking instead of spin_lock_irqsave
82 	arch_spin_lock(&rtas.lock);  in lock_rtas()
88 	arch_spin_unlock(&rtas.lock);  in unlock_rtas()
102 	if (!rtas.base)  in call_rtas_display_status()
106 	rtas_call_unlocked(&rtas.args, 10, 1, 1, NULL, c);  in call_rtas_display_status()
143  * hardcode rtas.base/entry etc.
152 	if (!rtas.base)  in udbg_rtascon_putc()
171 	if (!rtas.base)  in udbg_rtascon_getc_poll()
212 	if (!rtas.base)  in rtas_progress()
217 		if ((root = of_find_node_by_path("/rtas"))) {  in rtas_progress()
286 			/* RTAS wants CR-LF, not just LF */  in rtas_progress()
322 	if (rtas.dev == NULL)  in rtas_token()
324 	tokp = of_get_property(rtas.dev, service, NULL);  in rtas_token()
338  *  for all rtas calls that require an error buffer argument.
339  *  This includes 'check-exception' and 'rtas-last-error'.
347 	rtas_error_log_max = rtas_token ("rtas-error-log-max");  in rtas_get_error_log_max()
350 		printk (KERN_WARNING "RTAS: bad log buffer size %d\n",  in rtas_get_error_log_max()
363  *  most recent failed call to rtas.  Because the error text
364  *  might go stale if there are any other intervening rtas calls,
366  *  the error (i.e. with rtas.lock still held from the previous call).
386 	save_args = rtas.args;  in __fetch_rtas_last_error()
387 	rtas.args = err_args;  in __fetch_rtas_last_error()
389 	enter_rtas(__pa(&rtas.args));  in __fetch_rtas_last_error()
391 	err_args = rtas.args;  in __fetch_rtas_last_error()
392 	rtas.args = save_args;  in __fetch_rtas_last_error()
456 	if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)  in rtas_call()
461 	/* We use the global rtas args buffer */  in rtas_call()
462 	rtas_args = &rtas.args;  in rtas_call()
510 /* For an RTAS busy status code, perform the hinted delay. */
545 			printk(KERN_ERR "%s: unexpected RTAS error %d\n",  in rtas_error_rc()
631 	indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen);  in rtas_indicator_present()
668  * Ignoring RTAS extended delay
693 	printk("RTAS system-reboot returned %d\n",  in rtas_restart()
703 	printk("RTAS power-off returned %d\n",  in rtas_power_off()
713 	printk("RTAS power-off returned %d\n",  in rtas_halt()
992 	 * rtas call  in rtas_ibm_suspend_me()
1024  * Find a specific pseries error log in an RTAS extended event log.
1025  * @log: RTAS error/event log
1064  * arbitrary physical addresses to RTAS calls. A number of RTAS calls
1071  * subset of RTAS calls.
1073  * Accordingly, we filter RTAS requests to check that the call is
1185 	pr_err_ratelimited("sys_rtas: RTAS call blocked - exploit attempt?\n");  in block_rtas_call()
1202 SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)  in SYSCALL_DEFINE1()  argument
1212 	if (!rtas.entry)  in SYSCALL_DEFINE1()
1265 	rtas.args = args;  in SYSCALL_DEFINE1()
1266 	enter_rtas(__pa(&rtas.args));  in SYSCALL_DEFINE1()
1267 	args = rtas.args;  in SYSCALL_DEFINE1()
1293  * Call early during boot, before mem init, to retrieve the RTAS
1306 	/* Get RTAS dev node and fill up our "rtas" structure with infos  in rtas_initialize()
1309 	rtas.dev = of_find_node_by_name(NULL, "rtas");  in rtas_initialize()
1310 	if (!rtas.dev)  in rtas_initialize()
1313 	no_base = of_property_read_u32(rtas.dev, "linux,rtas-base", &base);  in rtas_initialize()
1314 	no_size = of_property_read_u32(rtas.dev, "rtas-size", &size);  in rtas_initialize()
1316 		of_node_put(rtas.dev);  in rtas_initialize()
1317 		rtas.dev = NULL;  in rtas_initialize()
1321 	rtas.base = base;  in rtas_initialize()
1322 	rtas.size = size;  in rtas_initialize()
1323 	no_entry = of_property_read_u32(rtas.dev, "linux,rtas-entry", &entry);  in rtas_initialize()
1324 	rtas.entry = no_entry ? rtas.base : entry;  in rtas_initialize()
1326 	/* If RTAS was found, allocate the RMO buffer for it and look for  in rtas_initialize()
1338 	rtas_last_error_token = rtas_token("rtas-last-error");  in rtas_initialize()
1353 	if (depth != 1 || strcmp(uname, "rtas") != 0)  in early_init_dt_scan_rtas()
1356 	basep  = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);  in early_init_dt_scan_rtas()
1357 	entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);  in early_init_dt_scan_rtas()
1358 	sizep  = of_get_flat_dt_prop(node, "rtas-size", NULL);  in early_init_dt_scan_rtas()
1361 		rtas.base = *basep;  in early_init_dt_scan_rtas()
1362 		rtas.entry = *entryp;  in early_init_dt_scan_rtas()
1363 		rtas.size = *sizep;  in early_init_dt_scan_rtas()