4  * Procedures for interfacing to the RTAS on CHRP machines.
30 #include <asm/rtas.h>
54 	srr_regs_clobbered(); /* rtas uses SRRs, invalidate */  in do_enter_rtas()
57 struct rtas_t rtas = {  variable
60 EXPORT_SYMBOL(rtas);
77 /* RTAS use home made raw locking instead of spin_lock_irqsave
88 	arch_spin_lock(&rtas.lock);  in lock_rtas()
94 	arch_spin_unlock(&rtas.lock);  in unlock_rtas()
108 	if (!rtas.base)  in call_rtas_display_status()
112 	rtas_call_unlocked(&rtas.args, 10, 1, 1, NULL, c);  in call_rtas_display_status()
149  * hardcode rtas.base/entry etc.
158 	if (!rtas.base)  in udbg_rtascon_putc()
177 	if (!rtas.base)  in udbg_rtascon_getc_poll()
218 	if (!rtas.base)  in rtas_progress()
223 		if ((root = of_find_node_by_path("/rtas"))) {  in rtas_progress()
292 			/* RTAS wants CR-LF, not just LF */  in rtas_progress()
328 	if (rtas.dev == NULL)  in rtas_token()
330 	tokp = of_get_property(rtas.dev, service, NULL);  in rtas_token()
344  *  for all rtas calls that require an error buffer argument.
345  *  This includes 'check-exception' and 'rtas-last-error'.
353 	rtas_error_log_max = rtas_token ("rtas-error-log-max");  in rtas_get_error_log_max()
356 		printk (KERN_WARNING "RTAS: bad log buffer size %d\n",  in rtas_get_error_log_max()
369  *  most recent failed call to rtas.  Because the error text
370  *  might go stale if there are any other intervening rtas calls,
372  *  the error (i.e. with rtas.lock still held from the previous call).
392 	save_args = rtas.args;  in __fetch_rtas_last_error()
393 	rtas.args = err_args;  in __fetch_rtas_last_error()
395 	do_enter_rtas(__pa(&rtas.args));  in __fetch_rtas_last_error()
397 	err_args = rtas.args;  in __fetch_rtas_last_error()
398 	rtas.args = save_args;  in __fetch_rtas_last_error()
462 	if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)  in rtas_call()
467 	/* We use the global rtas args buffer */  in rtas_call()
468 	rtas_args = &rtas.args;  in rtas_call()
516 /* For an RTAS busy status code, perform the hinted delay. */
551 			printk(KERN_ERR "%s: unexpected RTAS error %d\n",  in rtas_error_rc()
637 	indicators = of_get_property(rtas.dev, "rtas-indicators", &proplen);  in rtas_indicator_present()
674  * Ignoring RTAS extended delay
698  * @fw_status: RTAS call status will be placed here if not NULL.
756 	printk("RTAS system-reboot returned %d\n",  in rtas_restart()
766 	printk("RTAS power-off returned %d\n",  in rtas_power_off()
776 	printk("RTAS power-off returned %d\n",  in rtas_halt()
841  * rtas_call_reentrant() - Used for reentrant rtas calls
842  * @token:	Token for desired reentrant RTAS call
846  * @...:	Inputs for desired RTAS call
850  * Reentrant calls need their own rtas_args buffer, so not using rtas.args, but
854  *		First output value of RTAS call if (nret > 0),
864 	if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)  in rtas_call_reentrant()
870 	/* We use the per-cpu (PACA) rtas args buffer */  in rtas_call_reentrant()
893  * Find a specific pseries error log in an RTAS extended event log.
894  * @log: RTAS error/event log
933  * arbitrary physical addresses to RTAS calls. A number of RTAS calls
940  * subset of RTAS calls.
942  * Accordingly, we filter RTAS requests to check that the call is
1056 	pr_err_ratelimited("sys_rtas: RTAS call blocked - exploit attempt?\n");  in block_rtas_call()
1085 SYSCALL_DEFINE1(rtas, struct rtas_args __user *, uargs)  in SYSCALL_DEFINE1()  argument
1095 	if (!rtas.entry)  in SYSCALL_DEFINE1()
1148 	rtas.args = args;  in SYSCALL_DEFINE1()
1149 	do_enter_rtas(__pa(&rtas.args));  in SYSCALL_DEFINE1()
1150 	args = rtas.args;  in SYSCALL_DEFINE1()
1176  * Call early during boot, before mem init, to retrieve the RTAS
1186 	/* Get RTAS dev node and fill up our "rtas" structure with infos  in rtas_initialize()
1189 	rtas.dev = of_find_node_by_name(NULL, "rtas");  in rtas_initialize()
1190 	if (!rtas.dev)  in rtas_initialize()
1193 	no_base = of_property_read_u32(rtas.dev, "linux,rtas-base", &base);  in rtas_initialize()
1194 	no_size = of_property_read_u32(rtas.dev, "rtas-size", &size);  in rtas_initialize()
1196 		of_node_put(rtas.dev);  in rtas_initialize()
1197 		rtas.dev = NULL;  in rtas_initialize()
1201 	rtas.base = base;  in rtas_initialize()
1202 	rtas.size = size;  in rtas_initialize()
1203 	no_entry = of_property_read_u32(rtas.dev, "linux,rtas-entry", &entry);  in rtas_initialize()
1204 	rtas.entry = no_entry ? rtas.base : entry;  in rtas_initialize()
1206 	/* If RTAS was found, allocate the RMO buffer for it and look for  in rtas_initialize()
1216 		panic("ERROR: RTAS: Failed to allocate %lx bytes below %pa\n",  in rtas_initialize()
1220 	rtas_last_error_token = rtas_token("rtas-last-error");  in rtas_initialize()
1231 	if (depth != 1 || strcmp(uname, "rtas") != 0)  in early_init_dt_scan_rtas()
1234 	basep  = of_get_flat_dt_prop(node, "linux,rtas-base", NULL);  in early_init_dt_scan_rtas()
1235 	entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);  in early_init_dt_scan_rtas()
1236 	sizep  = of_get_flat_dt_prop(node, "rtas-size", NULL);  in early_init_dt_scan_rtas()
1239 		rtas.base = *basep;  in early_init_dt_scan_rtas()
1240 		rtas.entry = *entryp;  in early_init_dt_scan_rtas()
1241 		rtas.size = *sizep;  in early_init_dt_scan_rtas()