4  * Procedures for interfacing to the RTAS on CHRP machines.
32 #include <asm/rtas.h>
68 	srr_regs_clobbered(); /* rtas uses SRRs, invalidate */  in do_enter_rtas()
71 struct rtas_t rtas = {  variable
74 EXPORT_SYMBOL(rtas);
91 /* RTAS use home made raw locking instead of spin_lock_irqsave
102 	arch_spin_lock(&rtas.lock);  in lock_rtas()
108 	arch_spin_unlock(&rtas.lock);  in unlock_rtas()
122 	if (!rtas.base)  in call_rtas_display_status()
126 	rtas_call_unlocked(&rtas.args, 10, 1, 1, NULL, c);  in call_rtas_display_status()
163  * hardcode rtas.base/entry etc.
172 	if (!rtas.base)  in udbg_rtascon_putc()
191 	if (!rtas.base)  in udbg_rtascon_getc_poll()
232 	if (!rtas.base)  in rtas_progress()
237 		if ((root = of_find_node_by_path("/rtas"))) {  in rtas_progress()
306 			/* RTAS wants CR-LF, not just LF */  in rtas_progress()
342 	if (rtas.dev == NULL)  in rtas_token()
344 	tokp = of_get_property(rtas.dev, service, NULL);  in rtas_token()
358  *  for all rtas calls that require an error buffer argument.
359  *  This includes 'check-exception' and 'rtas-last-error'.
367 	rtas_error_log_max = rtas_token ("rtas-error-log-max");  in rtas_get_error_log_max()
370 		printk (KERN_WARNING "RTAS: bad log buffer size %d\n",  in rtas_get_error_log_max()
383  *  most recent failed call to rtas.  Because the error text
384  *  might go stale if there are any other intervening rtas calls,
386  *  the error (i.e. with rtas.lock still held from the previous call).
406 	save_args = rtas.args;  in __fetch_rtas_last_error()
407 	rtas.args = err_args;  in __fetch_rtas_last_error()
409 	do_enter_rtas(__pa(&rtas.args));  in __fetch_rtas_last_error()
411 	err_args = rtas.args;  in __fetch_rtas_last_error()
412 	rtas.args = save_args;  in __fetch_rtas_last_error()
479 	if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)  in rtas_call()
486 		 * RTAS status, not an errno.  in rtas_call()
499 	/* We use the global rtas args buffer */  in rtas_call()
500 	rtas_args = &rtas.args;  in rtas_call()
528  * rtas_busy_delay_time() - From an RTAS status value, calculate the
532  *          the status of a RTAS function call.
566  * rtas_busy_delay() - helper for RTAS busy and extended delay statuses
569  *          the status of a RTAS function call.
577  *           Generally the caller should reattempt the RTAS call which
660 			printk(KERN_ERR "%s: unexpected RTAS error %d\n",  in rtas_error_rc()
746 	indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen);  in rtas_indicator_present()
783  * Ignoring RTAS extended delay
807  * @fw_status: RTAS call status will be placed here if not NULL.
865 	printk("RTAS system-reboot returned %d\n",  in rtas_restart()
875 	printk("RTAS power-off returned %d\n",  in rtas_power_off()
885 	printk("RTAS power-off returned %d\n",  in rtas_halt()
949  * get_pseries_errorlog() - Find a specific pseries error log in an RTAS
951  * @log: RTAS error/event log
990  * arbitrary physical addresses to RTAS calls. A number of RTAS calls
997  * subset of RTAS calls.
999  * Accordingly, we filter RTAS requests to check that the call is
1122 	pr_err_ratelimited("sys_rtas: RTAS call blocked - exploit attempt?\n");  in block_rtas_call()
1151 SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)  in SYSCALL_DEFINE1()  argument
1161 	if (!rtas.entry)  in SYSCALL_DEFINE1()
1222 	rtas.args = args;  in SYSCALL_DEFINE1()
1223 	do_enter_rtas(__pa(&rtas.args));  in SYSCALL_DEFINE1()
1224 	args = rtas.args;  in SYSCALL_DEFINE1()
1250  * Call early during boot, before mem init, to retrieve the RTAS
1260 	/* Get RTAS dev node and fill up our "rtas" structure with infos  in rtas_initialize()
1263 	rtas.dev = of_find_node_by_name(NULL, "rtas");  in rtas_initialize()
1264 	if (!rtas.dev)  in rtas_initialize()
1267 	no_base = of_property_read_u32(rtas.dev, "linux,rtas-base", &base);  in rtas_initialize()
1268 	no_size = of_property_read_u32(rtas.dev, "rtas-size", &size);  in rtas_initialize()
1270 		of_node_put(rtas.dev);  in rtas_initialize()
1271 		rtas.dev = NULL;  in rtas_initialize()
1275 	rtas.base = base;  in rtas_initialize()
1276 	rtas.size = size;  in rtas_initialize()
1277 	no_entry = of_property_read_u32(rtas.dev, "linux,rtas-entry", &entry);  in rtas_initialize()
1278 	rtas.entry = no_entry ? rtas.base : entry;  in rtas_initialize()
1280 	/* If RTAS was found, allocate the RMO buffer for it and look for  in rtas_initialize()
1290 		panic("ERROR: RTAS: Failed to allocate %lx bytes below %pa\n",  in rtas_initialize()
1294 	rtas_last_error_token = rtas_token("rtas-last-error");  in rtas_initialize()
1306 	if (depth != 1 || strcmp(uname, "rtas") != 0)  in early_init_dt_scan_rtas()
1309 	basep  = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);  in early_init_dt_scan_rtas()
1310 	entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);  in early_init_dt_scan_rtas()
1311 	sizep  = of_get_flat_dt_prop(node, "rtas-size", NULL);  in early_init_dt_scan_rtas()
1320 		rtas.base = *basep;  in early_init_dt_scan_rtas()
1321 		rtas.entry = *entryp;  in early_init_dt_scan_rtas()
1322 		rtas.size = *sizep;  in early_init_dt_scan_rtas()