2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2011 Nathan Whitehorn
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/endian.h>
33 #include <sys/param.h>
34 #include <sys/kernel.h>
36 #include <sys/mutex.h>
37 #include <sys/systm.h>
41 #include <vm/vm_page.h>
44 #include <machine/bus.h>
45 #include <machine/md_var.h>
46 #include <machine/pcb.h>
47 #include <machine/rtas.h>
48 #include <machine/stdarg.h>
50 #include <dev/ofw/openfirm.h>
52 static MALLOC_DEFINE(M_RTAS, "rtas", "Run Time Abstraction Service");
54 static vm_offset_t rtas_bounce_phys;
55 static caddr_t rtas_bounce_virt;
56 static off_t rtas_bounce_offset;
57 static size_t rtas_bounce_size;
58 static uintptr_t rtas_private_data;
59 static struct mtx rtas_mtx;
60 static phandle_t rtas;
63 int rtascall(vm_offset_t callbuffer, uintptr_t rtas_privdat);
64 extern uintptr_t rtas_entry;
65 extern register_t rtasmsr;
68 * After the VM is up, allocate RTAS memory and instantiate it
71 static void rtas_setup(void *);
73 SYSINIT(rtas_setup, SI_SUB_KMEM, SI_ORDER_ANY, rtas_setup, NULL);
76 rtas_setup(void *junk)
79 cell_t rtas_size = 0, rtas_ptr;
83 rtas = OF_finddevice("/rtas");
88 OF_package_to_path(rtas, path, sizeof(path));
90 mtx_init(&rtas_mtx, "RTAS", NULL, MTX_SPIN);
92 /* RTAS must be called with everything turned off in MSR */
94 rtasmsr &= ~(PSL_IR | PSL_DR | PSL_EE | PSL_SE | PSL_LE);
100 * Allocate rtas_size + one page of contiguous, wired physical memory
101 * that can fit into a 32-bit address space and accessed from real mode.
102 * This is used both to bounce arguments and for RTAS private data.
104 * It must be 4KB-aligned and not cross a 256 MB boundary.
107 OF_getencprop(rtas, "rtas-size", &rtas_size, sizeof(rtas_size));
108 rtas_size = round_page(rtas_size);
109 rtas_bounce_virt = contigmalloc(rtas_size + PAGE_SIZE, M_RTAS, 0, 0,
110 ulmin(platform_real_maxaddr(), BUS_SPACE_MAXADDR_32BIT),
111 4096, 256*1024*1024);
113 rtas_private_data = vtophys(rtas_bounce_virt);
114 rtas_bounce_virt += rtas_size; /* Actual bounce area */
115 rtas_bounce_phys = vtophys(rtas_bounce_virt);
116 rtas_bounce_size = PAGE_SIZE;
119 * Instantiate RTAS. We always use the 32-bit version.
122 if (OF_hasprop(rtas, "linux,rtas-entry") &&
123 OF_hasprop(rtas, "linux,rtas-base")) {
124 OF_getencprop(rtas, "linux,rtas-base", &rtas_ptr,
126 rtas_private_data = rtas_ptr;
127 OF_getencprop(rtas, "linux,rtas-entry", &rtas_ptr,
130 rtasi = OF_open(path);
133 printf("Error initializing RTAS: could not open "
138 result = OF_call_method("instantiate-rtas", rtasi, 1, 1,
139 (cell_t)rtas_private_data, &rtas_ptr);
145 printf("Error initializing RTAS (%d)\n", result);
150 rtas_entry = (uintptr_t)(rtas_ptr);
154 rtas_real_map(const void *buf, size_t len)
158 mtx_assert(&rtas_mtx, MA_OWNED);
161 * Make sure the bounce page offset satisfies any reasonable
162 * alignment constraint.
164 rtas_bounce_offset += sizeof(register_t) -
165 (rtas_bounce_offset % sizeof(register_t));
167 if (rtas_bounce_offset + len > rtas_bounce_size) {
168 panic("Oversize RTAS call!");
173 memcpy(rtas_bounce_virt + rtas_bounce_offset, buf, len);
177 phys = rtas_bounce_phys + rtas_bounce_offset;
178 rtas_bounce_offset += len;
184 rtas_real_unmap(cell_t physaddr, void *buf, size_t len)
186 mtx_assert(&rtas_mtx, MA_OWNED);
191 memcpy(buf, rtas_bounce_virt + (physaddr - rtas_bounce_phys), len);
194 /* Check if we have RTAS */
201 /* Call an RTAS method by token */
203 rtas_call_method(cell_t token, int nargs, int nreturns, ...)
206 jmp_buf env, *oldfaultbuf;
212 cell_t args_n_results[12];
216 if (!rtas_exists() || nargs + nreturns > 12)
219 args.token = htobe32(token);
220 va_start(ap, nreturns);
222 mtx_lock_spin(&rtas_mtx);
223 rtas_bounce_offset = 0;
225 args.nargs = htobe32(nargs);
226 args.nreturns = htobe32(nreturns);
228 for (n = 0; n < nargs; n++)
229 args.args_n_results[n] = htobe32(va_arg(ap, cell_t));
231 argsptr = rtas_real_map(&args, sizeof(args));
233 /* Get rid of any stale machine checks that have been waiting. */
234 __asm __volatile ("sync; isync");
235 oldfaultbuf = curthread->td_pcb->pcb_onfault;
236 curthread->td_pcb->pcb_onfault = &env;
238 __asm __volatile ("sync");
239 result = rtascall(argsptr, rtas_private_data);
240 __asm __volatile ("sync; isync");
242 result = RTAS_HW_ERROR;
244 curthread->td_pcb->pcb_onfault = oldfaultbuf;
245 __asm __volatile ("sync");
247 rtas_real_unmap(argsptr, &args, sizeof(args));
248 mtx_unlock_spin(&rtas_mtx);
253 for (n = nargs; n < nargs + nreturns; n++)
254 *va_arg(ap, cell_t *) = be32toh(args.args_n_results[n]);
258 /* Look up an RTAS token */
260 rtas_token_lookup(const char *method)
267 if (OF_getencprop(rtas, method, &token, sizeof(token)) == -1)