4  * Procedures for interfacing to the RTAS on CHRP machines.
29 #include <asm/rtas.h>
49 struct rtas_t rtas = {  variable
52 EXPORT_SYMBOL(rtas);
69 /* RTAS use home made raw locking instead of spin_lock_irqsave
80 	arch_spin_lock(&rtas.lock);  in lock_rtas()
86 	arch_spin_unlock(&rtas.lock);  in unlock_rtas()
100 	if (!rtas.base)  in call_rtas_display_status()
104 	rtas_call_unlocked(&rtas.args, 10, 1, 1, NULL, c);  in call_rtas_display_status()
141  * hardcode rtas.base/entry etc.
150 	if (!rtas.base)  in udbg_rtascon_putc()
169 	if (!rtas.base)  in udbg_rtascon_getc_poll()
210 	if (!rtas.base)  in rtas_progress()
215 		if ((root = of_find_node_by_path("/rtas"))) {  in rtas_progress()
284 			/* RTAS wants CR-LF, not just LF */  in rtas_progress()
320 	if (rtas.dev == NULL)  in rtas_token()
322 	tokp = of_get_property(rtas.dev, service, NULL);  in rtas_token()
336  *  for all rtas calls that require an error buffer argument.
337  *  This includes 'check-exception' and 'rtas-last-error'.
345 	rtas_error_log_max = rtas_token ("rtas-error-log-max");  in rtas_get_error_log_max()
348 		printk (KERN_WARNING "RTAS: bad log buffer size %d\n",  in rtas_get_error_log_max()
361  *  most recent failed call to rtas.  Because the error text
362  *  might go stale if there are any other intervening rtas calls,
364  *  the error (i.e. with rtas.lock still held from the previous call).
384 	save_args = rtas.args;  in __fetch_rtas_last_error()
385 	rtas.args = err_args;  in __fetch_rtas_last_error()
387 	enter_rtas(__pa(&rtas.args));  in __fetch_rtas_last_error()
389 	err_args = rtas.args;  in __fetch_rtas_last_error()
390 	rtas.args = save_args;  in __fetch_rtas_last_error()
454 	if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)  in rtas_call()
459 	/* We use the global rtas args buffer */  in rtas_call()
460 	rtas_args = &rtas.args;  in rtas_call()
508 /* For an RTAS busy status code, perform the hinted delay. */
543 			printk(KERN_ERR "%s: unexpected RTAS error %d\n",  in rtas_error_rc()
629 	indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen);  in rtas_indicator_present()
666  * Ignoring RTAS extended delay
691 	printk("RTAS system-reboot returned %d\n",  in rtas_restart()
701 	printk("RTAS power-off returned %d\n",  in rtas_power_off()
711 	printk("RTAS power-off returned %d\n",  in rtas_halt()
884 	 * rtas call  in rtas_ibm_suspend_me()
902  * rtas_call_reentrant() - Used for reentrant rtas calls
903  * @token:	Token for desired reentrant RTAS call
907  * @...:	Inputs for desired RTAS call
911  * Reentrant calls need their own rtas_args buffer, so not using rtas.args, but
915  *		First output value of RTAS call if (nret > 0),
925 	if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)  in rtas_call_reentrant()
931 	/* We use the per-cpu (PACA) rtas args buffer */  in rtas_call_reentrant()
959  * Find a specific pseries error log in an RTAS extended event log.
960  * @log: RTAS error/event log
999  * arbitrary physical addresses to RTAS calls. A number of RTAS calls
1006  * subset of RTAS calls.
1008  * Accordingly, we filter RTAS requests to check that the call is
1120 	pr_err_ratelimited("sys_rtas: RTAS call blocked - exploit attempt?\n");  in block_rtas_call()
1137 SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)  in SYSCALL_DEFINE1()  argument
1147 	if (!rtas.entry)  in SYSCALL_DEFINE1()
1200 	rtas.args = args;  in SYSCALL_DEFINE1()
1201 	enter_rtas(__pa(&rtas.args));  in SYSCALL_DEFINE1()
1202 	args = rtas.args;  in SYSCALL_DEFINE1()
1228  * Call early during boot, before mem init, to retrieve the RTAS
1241 	/* Get RTAS dev node and fill up our "rtas" structure with infos  in rtas_initialize()
1244 	rtas.dev = of_find_node_by_name(NULL, "rtas");  in rtas_initialize()
1245 	if (!rtas.dev)  in rtas_initialize()
1248 	no_base = of_property_read_u32(rtas.dev, "linux,rtas-base", &base);  in rtas_initialize()
1249 	no_size = of_property_read_u32(rtas.dev, "rtas-size", &size);  in rtas_initialize()
1251 		of_node_put(rtas.dev);  in rtas_initialize()
1252 		rtas.dev = NULL;  in rtas_initialize()
1256 	rtas.base = base;  in rtas_initialize()
1257 	rtas.size = size;  in rtas_initialize()
1258 	no_entry = of_property_read_u32(rtas.dev, "linux,rtas-entry", &entry);  in rtas_initialize()
1259 	rtas.entry = no_entry ? rtas.base : entry;  in rtas_initialize()
1261 	/* If RTAS was found, allocate the RMO buffer for it and look for  in rtas_initialize()
1273 		panic("ERROR: RTAS: Failed to allocate %lx bytes below %pa\n",  in rtas_initialize()
1277 	rtas_last_error_token = rtas_token("rtas-last-error");  in rtas_initialize()
1292 	if (depth != 1 || strcmp(uname, "rtas") != 0)  in early_init_dt_scan_rtas()
1295 	basep  = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);  in early_init_dt_scan_rtas()
1296 	entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);  in early_init_dt_scan_rtas()
1297 	sizep  = of_get_flat_dt_prop(node, "rtas-size", NULL);  in early_init_dt_scan_rtas()
1300 		rtas.base = *basep;  in early_init_dt_scan_rtas()
1301 		rtas.entry = *entryp;  in early_init_dt_scan_rtas()
1302 		rtas.size = *sizep;  in early_init_dt_scan_rtas()