rtas.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2011 Nathan Whitehorn
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   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.
   15  *
   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
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/endian.h>
   33 #include <sys/param.h>
   34 #include <sys/kernel.h>
   35 #include <sys/lock.h>
   36 #include <sys/mutex.h>
   37 #include <sys/systm.h>
   38 #include <sys/proc.h>
   39 
   40 #include <vm/vm.h>
   41 #include <vm/vm_page.h>
   42 #include <vm/pmap.h>
   43 
   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>
   49 
   50 #include <dev/ofw/openfirm.h>
   51 
   52 static MALLOC_DEFINE(M_RTAS, "rtas", "Run Time Abstraction Service");
   53 
   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;
   61 
   62 /* From ofwcall.S */
   63 int rtascall(vm_offset_t callbuffer, uintptr_t rtas_privdat);
   64 extern uintptr_t        rtas_entry;
   65 extern register_t       rtasmsr;
   66 
   67 /*
   68  * After the VM is up, allocate RTAS memory and instantiate it
   69  */
   70 
   71 static void rtas_setup(void *);
   72 
   73 SYSINIT(rtas_setup, SI_SUB_KMEM, SI_ORDER_ANY, rtas_setup, NULL);
   74 
   75 static void
   76 rtas_setup(void *junk)
   77 {
   78         ihandle_t rtasi;
   79         cell_t rtas_size = 0, rtas_ptr;
   80         char path[31];
   81         int result;
   82 
   83         rtas = OF_finddevice("/rtas");
   84         if (rtas == -1) {
   85                 rtas = 0;
   86                 return;
   87         }
   88         OF_package_to_path(rtas, path, sizeof(path));
   89 
   90         mtx_init(&rtas_mtx, "RTAS", NULL, MTX_SPIN);
   91 
   92         /* RTAS must be called with everything turned off in MSR */
   93         rtasmsr = mfmsr();
   94         rtasmsr &= ~(PSL_IR | PSL_DR | PSL_EE | PSL_SE | PSL_LE);
   95         #ifdef __powerpc64__
   96         rtasmsr &= ~PSL_SF;
   97         #endif
   98 
   99         /*
  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.
  103          *
  104          * It must be 4KB-aligned and not cross a 256 MB boundary.
  105          */
  106 
  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);
  112 
  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;
  117 
  118         /*
  119          * Instantiate RTAS. We always use the 32-bit version.
  120          */
  121 
  122         if (OF_hasprop(rtas, "linux,rtas-entry") &&
  123             OF_hasprop(rtas, "linux,rtas-base")) {
  124                 OF_getencprop(rtas, "linux,rtas-base", &rtas_ptr,
  125                     sizeof(rtas_ptr));
  126                 rtas_private_data = rtas_ptr;
  127                 OF_getencprop(rtas, "linux,rtas-entry", &rtas_ptr,
  128                     sizeof(rtas_ptr));
  129         } else {
  130                 rtasi = OF_open(path);
  131                 if (rtasi == 0) {
  132                         rtas = 0;
  133                         printf("Error initializing RTAS: could not open "
  134                             "node\n");
  135                         return;
  136                 }
  137 
  138                 result = OF_call_method("instantiate-rtas", rtasi, 1, 1,
  139                     (cell_t)rtas_private_data, &rtas_ptr);
  140                 OF_close(rtasi);
  141 
  142                 if (result != 0) {
  143                         rtas = 0;
  144                         rtas_ptr = 0;
  145                         printf("Error initializing RTAS (%d)\n", result);
  146                         return;
  147                 }
  148         }
  149 
  150         rtas_entry = (uintptr_t)(rtas_ptr);
  151 }
  152 
  153 static cell_t
  154 rtas_real_map(const void *buf, size_t len)
  155 {
  156         cell_t phys;
  157 
  158         mtx_assert(&rtas_mtx, MA_OWNED);
  159 
  160         /*
  161          * Make sure the bounce page offset satisfies any reasonable
  162          * alignment constraint.
  163          */
  164         rtas_bounce_offset += sizeof(register_t) -
  165             (rtas_bounce_offset % sizeof(register_t));
  166 
  167         if (rtas_bounce_offset + len > rtas_bounce_size) {
  168                 panic("Oversize RTAS call!");
  169                 return 0;
  170         }
  171 
  172         if (buf != NULL)
  173                 memcpy(rtas_bounce_virt + rtas_bounce_offset, buf, len);
  174         else
  175                 return (0);
  176 
  177         phys = rtas_bounce_phys + rtas_bounce_offset;
  178         rtas_bounce_offset += len;
  179 
  180         return (phys);
  181 }
  182 
  183 static void
  184 rtas_real_unmap(cell_t physaddr, void *buf, size_t len)
  185 {
  186         mtx_assert(&rtas_mtx, MA_OWNED);
  187 
  188         if (physaddr == 0)
  189                 return;
  190 
  191         memcpy(buf, rtas_bounce_virt + (physaddr - rtas_bounce_phys), len);
  192 }
  193 
  194 /* Check if we have RTAS */
  195 int
  196 rtas_exists(void)
  197 {
  198         return (rtas != 0);
  199 }
  200 
  201 /* Call an RTAS method by token */
  202 int
  203 rtas_call_method(cell_t token, int nargs, int nreturns, ...)
  204 {
  205         vm_offset_t argsptr;
  206         jmp_buf env, *oldfaultbuf;
  207         va_list ap;
  208         struct {
  209                 cell_t token;
  210                 cell_t nargs;
  211                 cell_t nreturns;
  212                 cell_t args_n_results[12];
  213         } args;
  214         int n, result;
  215 
  216         if (!rtas_exists() || nargs + nreturns > 12)
  217                 return (-1);
  218 
  219         args.token = htobe32(token);
  220         va_start(ap, nreturns);
  221 
  222         mtx_lock_spin(&rtas_mtx);
  223         rtas_bounce_offset = 0;
  224 
  225         args.nargs = htobe32(nargs);
  226         args.nreturns = htobe32(nreturns);
  227 
  228         for (n = 0; n < nargs; n++)
  229                 args.args_n_results[n] = htobe32(va_arg(ap, cell_t));
  230 
  231         argsptr = rtas_real_map(&args, sizeof(args));
  232 
  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;
  237         if (!setjmp(env)) {
  238                 __asm __volatile ("sync");
  239                 result = rtascall(argsptr, rtas_private_data);
  240                 __asm __volatile ("sync; isync");
  241         } else {
  242                 result = RTAS_HW_ERROR;
  243         }
  244         curthread->td_pcb->pcb_onfault = oldfaultbuf;
  245         __asm __volatile ("sync");
  246 
  247         rtas_real_unmap(argsptr, &args, sizeof(args));
  248         mtx_unlock_spin(&rtas_mtx);
  249 
  250         if (result < 0)
  251                 return (result);
  252 
  253         for (n = nargs; n < nargs + nreturns; n++)
  254                 *va_arg(ap, cell_t *) = be32toh(args.args_n_results[n]);
  255         return (result);
  256 }
  257 
  258 /* Look up an RTAS token */
  259 cell_t
  260 rtas_token_lookup(const char *method)
  261 {
  262         cell_t token;
  263 
  264         if (!rtas_exists())
  265                 return (-1);
  266 
  267         if (OF_getencprop(rtas, method, &token, sizeof(token)) == -1)
  268                 return (-1);
  269 
  270         return (token);
  271 }

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FreeBSD/Linux Kernel Cross Reference sys/powerpc/ofw/rtas.c

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/ofw/rtas.c