1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
46 #include <machine/rtas.h>
50 static MALLOC_DEFINE(M_RTAS, "rtas", "Run Time Abstraction Service");
58 static phandle_t	rtas;  variable
66  * After the VM is up, allocate RTAS memory and instantiate it
81 	rtas = OF_finddevice("/rtas");  in rtas_setup()
82 	if (rtas == -1) {  in rtas_setup()
83 		rtas = 0;  in rtas_setup()
86 	OF_package_to_path(rtas, path, sizeof(path));  in rtas_setup()
88 	mtx_init(&rtas_mtx, "RTAS", NULL, MTX_SPIN);  in rtas_setup()
90 	/* RTAS must be called with everything turned off in MSR */  in rtas_setup()
99 	 * that can fit into a 32-bit address space and accessed from real mode.  in rtas_setup()
100 	 * This is used both to bounce arguments and for RTAS private data.  in rtas_setup()
102 	 * It must be 4KB-aligned and not cross a 256 MB boundary.  in rtas_setup()
105 	OF_getencprop(rtas, "rtas-size", &rtas_size, sizeof(rtas_size));  in rtas_setup()
117 	 * Instantiate RTAS. We always use the 32-bit version.  in rtas_setup()
120 	if (OF_hasprop(rtas, "linux,rtas-entry") &&  in rtas_setup()
121 	    OF_hasprop(rtas, "linux,rtas-base")) {  in rtas_setup()
122 		OF_getencprop(rtas, "linux,rtas-base", &rtas_ptr,  in rtas_setup()
125 		OF_getencprop(rtas, "linux,rtas-entry", &rtas_ptr,  in rtas_setup()
130 			rtas = 0;  in rtas_setup()
131 			printf("Error initializing RTAS: could not open "  in rtas_setup()
136 		result = OF_call_method("instantiate-rtas", rtasi, 1, 1,  in rtas_setup()
141 			rtas = 0;  in rtas_setup()
143 			printf("Error initializing RTAS (%d)\n", result);  in rtas_setup()
162 	rtas_bounce_offset += sizeof(register_t) -  in rtas_real_map()
166 		panic("Oversize RTAS call!");  in rtas_real_map()
189 	memcpy(buf, rtas_bounce_virt + (physaddr - rtas_bounce_phys), len);  in rtas_real_unmap()
192 /* Check if we have RTAS */
196 	return (rtas != 0);  in rtas_exists()
199 /* Call an RTAS method by token */
215 		return (-1);  in rtas_call_method()
233 	oldfaultbuf = curthread->td_pcb->pcb_onfault;  in rtas_call_method()
234 	curthread->td_pcb->pcb_onfault = &env;  in rtas_call_method()
242 	curthread->td_pcb->pcb_onfault = oldfaultbuf;  in rtas_call_method()
256 /* Look up an RTAS token */
263 		return (-1);  in rtas_token_lookup()
265 	if (OF_getencprop(rtas, method, &token, sizeof(token)) == -1)  in rtas_token_lookup()
266 		return (-1);  in rtas_token_lookup()