rtas.c

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    1 /*-
    2  * Copyright (c) 2011 Nathan Whitehorn
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/9.0/sys/powerpc/ofw/rtas.c 223571 2011-06-26 16:11:36Z nwhitehorn $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/kernel.h>
   32 #include <sys/lock.h>
   33 #include <sys/mutex.h>
   34 #include <sys/systm.h>
   35 #include <sys/proc.h>
   36 
   37 #include <vm/vm.h>
   38 #include <vm/vm_page.h>
   39 #include <vm/pmap.h>
   40 
   41 #include <machine/bus.h>
   42 #include <machine/md_var.h>
   43 #include <machine/pcb.h>
   44 #include <machine/pmap.h>
   45 #include <machine/rtas.h>
   46 #include <machine/stdarg.h>
   47 
   48 #include <dev/ofw/openfirm.h>
   49 
   50 MALLOC_DEFINE(M_RTAS, "rtas", "Run Time Abstraction Service");
   51 
   52 static vm_offset_t      rtas_bounce_phys;
   53 static caddr_t          rtas_bounce_virt;
   54 static off_t            rtas_bounce_offset;
   55 static size_t           rtas_bounce_size;
   56 static uintptr_t        rtas_private_data;
   57 static struct mtx       rtas_mtx;
   58 static phandle_t        rtas;
   59 
   60 /* From ofwcall.S */
   61 int rtascall(vm_offset_t callbuffer, uintptr_t rtas_privdat);
   62 extern uintptr_t        rtas_entry;
   63 extern register_t       rtasmsr;
   64 
   65 int setfault(faultbuf);             /* defined in locore.S */
   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         rtasi = OF_open(path);
   90         if (rtasi == 0) {
   91                 rtas = 0;
   92                 printf("Error initializing RTAS: could not open node\n");
   93                 return;
   94         }
   95 
   96         mtx_init(&rtas_mtx, "RTAS", MTX_DEF, 0);
   97 
   98         /* RTAS must be called with everything turned off in MSR */
   99         rtasmsr = mfmsr();
  100         rtasmsr &= ~(PSL_IR | PSL_DR | PSL_EE | PSL_SE);
  101         #ifdef __powerpc64__
  102         rtasmsr &= ~PSL_SF;
  103         #endif
  104 
  105         /*
  106          * Allocate rtas_size + one page of contiguous, wired physical memory
  107          * that can fit into a 32-bit address space and accessed from real mode.
  108          * This is used both to bounce arguments and for RTAS private data.
  109          *
  110          * It must be 4KB-aligned and not cross a 256 MB boundary.
  111          */
  112 
  113         OF_getprop(rtas, "rtas-size", &rtas_size, sizeof(rtas_size));
  114         rtas_size = round_page(rtas_size);
  115         rtas_bounce_virt = contigmalloc(rtas_size + PAGE_SIZE, M_RTAS, 0, 0,
  116             ulmin(platform_real_maxaddr(), BUS_SPACE_MAXADDR_32BIT),
  117             4096, 256*1024*1024);
  118 
  119         rtas_private_data = vtophys(rtas_bounce_virt);
  120         rtas_bounce_virt += rtas_size;  /* Actual bounce area */
  121         rtas_bounce_phys = vtophys(rtas_bounce_virt);
  122         rtas_bounce_size = PAGE_SIZE;
  123 
  124         /*
  125          * Instantiate RTAS. We always use the 32-bit version.
  126          */
  127 
  128         result = OF_call_method("instantiate-rtas", rtasi, 1, 1,
  129             (cell_t)rtas_private_data, &rtas_ptr);
  130         OF_close(rtasi);
  131 
  132         if (result != 0) {
  133                 rtas = 0;
  134                 rtas_ptr = 0;
  135                 printf("Error initializing RTAS (%d)\n", result);
  136                 return;
  137         }
  138 
  139         rtas_entry = (uintptr_t)(rtas_ptr);
  140 }
  141 
  142 static cell_t
  143 rtas_real_map(const void *buf, size_t len)
  144 {
  145         cell_t phys;
  146 
  147         mtx_assert(&rtas_mtx, MA_OWNED);
  148 
  149         /*
  150          * Make sure the bounce page offset satisfies any reasonable
  151          * alignment constraint.
  152          */
  153         rtas_bounce_offset += sizeof(register_t) -
  154             (rtas_bounce_offset % sizeof(register_t));
  155 
  156         if (rtas_bounce_offset + len > rtas_bounce_size) {
  157                 panic("Oversize RTAS call!");
  158                 return 0;
  159         }
  160 
  161         if (buf != NULL)
  162                 memcpy(rtas_bounce_virt + rtas_bounce_offset, buf, len);
  163         else
  164                 return (0);
  165 
  166         phys = rtas_bounce_phys + rtas_bounce_offset;
  167         rtas_bounce_offset += len;
  168 
  169         return (phys);
  170 }
  171 
  172 static void
  173 rtas_real_unmap(cell_t physaddr, void *buf, size_t len)
  174 {
  175         mtx_assert(&rtas_mtx, MA_OWNED);
  176 
  177         if (physaddr == 0)
  178                 return;
  179 
  180         memcpy(buf, rtas_bounce_virt + (physaddr - rtas_bounce_phys), len);
  181 }
  182 
  183 /* Check if we have RTAS */
  184 int
  185 rtas_exists(void)
  186 {
  187         return (rtas != 0);
  188 }
  189 
  190 /* Call an RTAS method by token */
  191 int
  192 rtas_call_method(cell_t token, int nargs, int nreturns, ...)
  193 {
  194         vm_offset_t argsptr;
  195         faultbuf env;
  196         va_list ap;
  197         struct {
  198                 cell_t token;
  199                 cell_t nargs;
  200                 cell_t nreturns;
  201                 cell_t args_n_results[12];
  202         } args;
  203         int n, result;
  204 
  205         if (!rtas_exists() || nargs + nreturns > 12)
  206                 return (-1);
  207 
  208         args.token = token;
  209         va_start(ap, nreturns);
  210 
  211         mtx_lock(&rtas_mtx);
  212         rtas_bounce_offset = 0;
  213 
  214         args.nargs = nargs;
  215         args.nreturns = nreturns;
  216 
  217         for (n = 0; n < nargs; n++)
  218                 args.args_n_results[n] = va_arg(ap, cell_t);
  219 
  220         argsptr = rtas_real_map(&args, sizeof(args));
  221 
  222         /* Get rid of any stale machine checks that have been waiting.  */
  223         __asm __volatile ("sync; isync");
  224         if (!setfault(env)) {
  225                 __asm __volatile ("sync");
  226                 result = rtascall(argsptr, rtas_private_data);
  227                 __asm __volatile ("sync; isync");
  228         } else {
  229                 result = RTAS_HW_ERROR;
  230         }
  231         curthread->td_pcb->pcb_onfault = 0;
  232         __asm __volatile ("sync");
  233 
  234         rtas_real_unmap(argsptr, &args, sizeof(args));
  235         mtx_unlock(&rtas_mtx);
  236 
  237         if (result < 0)
  238                 return (result);
  239 
  240         for (n = nargs; n < nargs + nreturns; n++)
  241                 *va_arg(ap, cell_t *) = args.args_n_results[n];
  242         return (result);
  243 }
  244 
  245 /* Look up an RTAS token */
  246 cell_t
  247 rtas_token_lookup(const char *method)
  248 {
  249         cell_t token;
  250         
  251         if (!rtas_exists())
  252                 return (-1);
  253 
  254         if (OF_getprop(rtas, method, &token, sizeof(token)) == -1)
  255                 return (-1);
  256 
  257         return (token);
  258 }
  259 
  260

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

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