ofw_machdep.c

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    1 /*-
    2  * Copyright (C) 1996 Wolfgang Solfrank.
    3  * Copyright (C) 1996 TooLs GmbH.
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. All advertising materials mentioning features or use of this software
   15  *    must display the following acknowledgement:
   16  *      This product includes software developed by TooLs GmbH.
   17  * 4. The name of TooLs GmbH may not be used to endorse or promote products
   18  *    derived from this software without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
   21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   23  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   26  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   27  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   28  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   29  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   30  *
   31  * $NetBSD: ofw_machdep.c,v 1.5 2000/05/23 13:25:43 tsubai Exp $
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: releng/6.2/sys/powerpc/powerpc/ofw_machdep.c 152292 2005-11-11 05:21:08Z grehan $");
   36 
   37 #include <sys/param.h>
   38 #include <sys/bus.h>
   39 #include <sys/systm.h>
   40 #include <sys/conf.h>
   41 #include <sys/disk.h>
   42 #include <sys/fcntl.h>
   43 #include <sys/malloc.h>
   44 #include <sys/stat.h>
   45 
   46 #include <net/ethernet.h>
   47 
   48 #include <dev/ofw/openfirm.h>
   49 
   50 #include <vm/vm.h>
   51 #include <vm/vm_param.h>
   52 #include <vm/vm_page.h>
   53 
   54 #include <machine/powerpc.h>
   55 #include <machine/ofw_machdep.h>
   56 #include <powerpc/ofw/ofw_pci.h>
   57 
   58 #define OFMEM_REGIONS   32
   59 static struct mem_region OFmem[OFMEM_REGIONS + 1], OFavail[OFMEM_REGIONS + 3];
   60 static struct mem_region OFfree[OFMEM_REGIONS + 3];
   61 
   62 extern register_t ofmsr[5];
   63 extern struct   pcpu __pcpu[MAXCPU];
   64 extern struct   pmap ofw_pmap;
   65 extern int      pmap_bootstrapped;
   66 static int      (*ofwcall)(void *);
   67 
   68 /*
   69  * Saved SPRG0-3 from OpenFirmware. Will be restored prior to the callback.
   70  */
   71 register_t      ofw_sprg0_save;
   72 
   73 static __inline void
   74 ofw_sprg_prepare(void)
   75 {
   76         /*
   77          * Assume that interrupt are disabled at this point, or
   78          * SPRG1-3 could be trashed
   79          */
   80         __asm __volatile("mfsprg0 %0\n\t"
   81                          "mtsprg0 %1\n\t"
   82                          "mtsprg1 %2\n\t"
   83                          "mtsprg2 %3\n\t"
   84                          "mtsprg3 %4\n\t"
   85                          : "=&r"(ofw_sprg0_save)
   86                          : "r"(ofmsr[1]),
   87                          "r"(ofmsr[2]),
   88                          "r"(ofmsr[3]),
   89                          "r"(ofmsr[4]));
   90 }
   91 
   92 static __inline void
   93 ofw_sprg_restore(void)
   94 {
   95         /*
   96          * Note that SPRG1-3 contents are irrelevant. They are scratch
   97          * registers used in the early portion of trap handling when
   98          * interrupts are disabled.
   99          *
  100          * PCPU data cannot be used until this routine is called !
  101          */
  102         __asm __volatile("mtsprg0 %0" :: "r"(ofw_sprg0_save));
  103 }
  104 
  105 /*
  106  * Memory region utilities: determine if two regions overlap,
  107  * and merge two overlapping regions into one
  108  */
  109 static int
  110 memr_overlap(struct mem_region *r1, struct mem_region *r2)
  111 {
  112         if ((r1->mr_start + r1->mr_size) < r2->mr_start ||
  113             (r2->mr_start + r2->mr_size) < r1->mr_start)
  114                 return (FALSE);
  115         
  116         return (TRUE);  
  117 }
  118 
  119 static void
  120 memr_merge(struct mem_region *from, struct mem_region *to)
  121 {
  122         int end;
  123         end = imax(to->mr_start + to->mr_size, from->mr_start + from->mr_size);
  124         to->mr_start = imin(from->mr_start, to->mr_start);
  125         to->mr_size = end - to->mr_start;
  126 }
  127 
  128 /*
  129  * This is called during powerpc_init, before the system is really initialized.
  130  * It shall provide the total and the available regions of RAM.
  131  * Both lists must have a zero-size entry as terminator.
  132  * The available regions need not take the kernel into account, but needs
  133  * to provide space for two additional entry beyond the terminating one.
  134  */
  135 void
  136 mem_regions(struct mem_region **memp, int *memsz,
  137                 struct mem_region **availp, int *availsz)
  138 {
  139         int phandle;
  140         int asz, msz, fsz;
  141         int i, j;
  142         int still_merging;
  143         
  144         /*
  145          * Get memory.
  146          */
  147         if ((phandle = OF_finddevice("/memory")) == -1
  148             || (msz = OF_getprop(phandle, "reg",
  149                           OFmem, sizeof OFmem[0] * OFMEM_REGIONS))
  150                <= 0
  151             || (asz = OF_getprop(phandle, "available",
  152                           OFavail, sizeof OFavail[0] * OFMEM_REGIONS))
  153                <= 0)
  154                 panic("no memory?");
  155         *memp = OFmem;
  156         *memsz = msz / sizeof(struct mem_region);
  157 
  158         /*
  159          * OFavail may have overlapping regions - collapse these
  160          * and copy out remaining regions to OFfree
  161          */
  162         asz /= sizeof(struct mem_region);
  163         do {
  164                 still_merging = FALSE;
  165                 for (i = 0; i < asz; i++) {
  166                         if (OFavail[i].mr_size == 0)
  167                                 continue;
  168                         for (j = i+1; j < asz; j++) {
  169                                 if (OFavail[j].mr_size == 0)
  170                                         continue;
  171                                 if (memr_overlap(&OFavail[j], &OFavail[i])) {
  172                                         memr_merge(&OFavail[j], &OFavail[i]);
  173                                         /* mark inactive */
  174                                         OFavail[j].mr_size = 0;
  175                                         still_merging = TRUE;
  176                                 }
  177                         }
  178                 }
  179         } while (still_merging == TRUE);
  180 
  181         /* evict inactive ranges */
  182         for (i = 0, fsz = 0; i < asz; i++) {
  183                 if (OFavail[i].mr_size != 0) {
  184                         OFfree[fsz] = OFavail[i];
  185                         fsz++;
  186                 }
  187         }
  188 
  189         *availp = OFfree;
  190         *availsz = fsz;
  191 }
  192 
  193 void
  194 set_openfirm_callback(int (*openfirm)(void *))
  195 {
  196 
  197         ofwcall = openfirm;
  198 }
  199 
  200 int
  201 openfirmware(void *args)
  202 {
  203         long    oldmsr;
  204         int     result;
  205         u_int   srsave[16];
  206         u_int   i;
  207 
  208         __asm __volatile(       "\t"
  209                 "sync\n\t"
  210                 "mfmsr  %0\n\t"
  211                 "mtmsr  %1\n\t"
  212                 "isync\n"
  213                 : "=r" (oldmsr)
  214                 : "r" (ofmsr[0])
  215         );
  216 
  217         ofw_sprg_prepare();
  218 
  219         if (pmap_bootstrapped) {
  220                 /*
  221                  * Swap the kernel's address space with Open Firmware's
  222                  */
  223                 for (i = 0; i < 16; i++) {
  224                         srsave[i] = mfsrin(i << ADDR_SR_SHFT);
  225                         mtsrin(i << ADDR_SR_SHFT, ofw_pmap.pm_sr[i]);
  226                 }
  227 
  228                 /*
  229                  * Clear battable[] translations
  230                  */
  231                 __asm __volatile("mtdbatu 2, %0\n"
  232                                  "mtdbatu 3, %0" : : "r" (0));
  233                 isync();
  234         }
  235 
  236         result = ofwcall(args);
  237 
  238         if (pmap_bootstrapped) {
  239                 /*
  240                  * Restore the kernel's addr space. The isync() doesn;t
  241                  * work outside the loop unless mtsrin() is open-coded
  242                  * in an asm statement :(
  243                  */
  244                 for (i = 0; i < 16; i++) {
  245                         mtsrin(i << ADDR_SR_SHFT, srsave[i]);
  246                         isync();
  247                 }
  248         }
  249 
  250         ofw_sprg_restore();
  251 
  252         __asm(  "\t"
  253                 "mtmsr  %0\n\t"
  254                 "isync\n"
  255                 : : "r" (oldmsr)
  256         );
  257 
  258         return (result);
  259 }
  260 
  261 void
  262 OF_halt()
  263 {
  264         int retval;     /* dummy, this may not be needed */
  265 
  266         OF_interpret("shut-down", 1, &retval);
  267         for (;;);       /* just in case */
  268 }
  269 
  270 void
  271 OF_reboot()
  272 {
  273         int retval;     /* dummy, this may not be needed */
  274 
  275         OF_interpret("reset-all", 1, &retval);
  276         for (;;);       /* just in case */
  277 }
  278 
  279 void
  280 OF_getetheraddr(device_t dev, u_char *addr)
  281 {
  282         phandle_t       node;
  283 
  284         node = ofw_pci_find_node(dev);
  285         OF_getprop(node, "local-mac-address", addr, ETHER_ADDR_LEN);
  286 }
  287 
  288 int
  289 mem_valid(vm_offset_t addr, int len)
  290 {
  291         int i;
  292 
  293         for (i = 0; i < OFMEM_REGIONS; i++)
  294                 if ((addr >= OFmem[i].mr_start) 
  295                     && (addr + len < OFmem[i].mr_start + OFmem[i].mr_size))
  296                         return (0);
  297 
  298         return (EFAULT);
  299 }

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FreeBSD/Linux Kernel Cross Reference sys/powerpc/powerpc/ofw_machdep.c

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sys/powerpc/powerpc/ofw_machdep.c