The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/mips/beri/beri_machdep.c

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    1 /*-
    2  * Copyright (c) 2006 Wojciech A. Koszek <wkoszek@FreeBSD.org>
    3  * Copyright (c) 2012-2014 Robert N. M. Watson
    4  * All rights reserved.
    5  *
    6  * This software was developed by SRI International and the University of
    7  * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
    8  * ("CTSRD"), as part of the DARPA CRASH research programme.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: releng/11.0/sys/mips/beri/beri_machdep.c 296265 2016-03-01 11:39:07Z andrew $");
   33 
   34 #include "opt_ddb.h"
   35 #include "opt_platform.h"
   36 
   37 #include <sys/param.h>
   38 #include <sys/conf.h>
   39 #include <sys/kernel.h>
   40 #include <sys/systm.h>
   41 #include <sys/imgact.h>
   42 #include <sys/bio.h>
   43 #include <sys/buf.h>
   44 #include <sys/bus.h>
   45 #include <sys/cpu.h>
   46 #include <sys/cons.h>
   47 #include <sys/exec.h>
   48 #include <sys/linker.h>
   49 #include <sys/ucontext.h>
   50 #include <sys/proc.h>
   51 #include <sys/kdb.h>
   52 #include <sys/ptrace.h>
   53 #include <sys/reboot.h>
   54 #include <sys/signalvar.h>
   55 #include <sys/sysent.h>
   56 #include <sys/sysproto.h>
   57 #include <sys/user.h>
   58 
   59 #ifdef FDT
   60 #include <dev/fdt/fdt_common.h>
   61 #include <dev/ofw/openfirm.h>
   62 #endif
   63 
   64 #include <vm/vm.h>
   65 #include <vm/vm_object.h>
   66 #include <vm/vm_page.h>
   67 
   68 #include <machine/bootinfo.h>
   69 #include <machine/clock.h>
   70 #include <machine/cpu.h>
   71 #include <machine/cpuregs.h>
   72 #include <machine/hwfunc.h>
   73 #include <machine/md_var.h>
   74 #include <machine/metadata.h>
   75 #include <machine/pmap.h>
   76 #include <machine/trap.h>
   77 
   78 extern int      *edata;
   79 extern int      *end;
   80 
   81 void
   82 platform_cpu_init()
   83 {
   84         /* Nothing special */
   85 }
   86 
   87 static void
   88 mips_init(void)
   89 {
   90         int i;
   91 #ifdef FDT
   92         struct mem_region mr[FDT_MEM_REGIONS];
   93         uint64_t val;
   94         int mr_cnt;
   95         int j;
   96 #endif
   97 
   98         for (i = 0; i < 10; i++) {
   99                 phys_avail[i] = 0;
  100         }
  101 
  102         /* phys_avail regions are in bytes */
  103         phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
  104         phys_avail[1] = ctob(realmem);
  105 
  106         dump_avail[0] = phys_avail[0];
  107         dump_avail[1] = phys_avail[1];
  108 
  109         physmem = realmem;
  110 
  111 #ifdef FDT
  112         if (fdt_get_mem_regions(mr, &mr_cnt, &val) == 0) {
  113 
  114                 physmem = btoc(val);
  115 
  116                 KASSERT((phys_avail[0] >= mr[0].mr_start) && \
  117                         (phys_avail[0] < (mr[0].mr_start + mr[0].mr_size)),
  118                         ("First region is not within FDT memory range"));
  119 
  120                 /* Limit size of the first region */
  121                 phys_avail[1] = (mr[0].mr_start + MIN(mr[0].mr_size, ctob(realmem)));
  122                 dump_avail[1] = phys_avail[1];
  123 
  124                 /* Add the rest of regions */
  125                 for (i = 1, j = 2; i < mr_cnt; i++, j+=2) {
  126                         phys_avail[j] = mr[i].mr_start;
  127                         phys_avail[j+1] = (mr[i].mr_start + mr[i].mr_size);
  128                         dump_avail[j] = phys_avail[j];
  129                         dump_avail[j+1] = phys_avail[j+1];
  130                 }
  131         }
  132 #endif
  133 
  134         init_param1();
  135         init_param2(physmem);
  136         mips_cpu_init();
  137         pmap_bootstrap();
  138         mips_proc0_init();
  139         mutex_init();
  140         kdb_init();
  141 #ifdef KDB
  142         if (boothowto & RB_KDB)
  143                 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
  144 #endif
  145 }
  146 
  147 /*
  148  * Perform a board-level soft-reset.
  149  */
  150 void
  151 platform_reset(void)
  152 {
  153 
  154         /* XXX SMP will likely require us to do more. */
  155         __asm__ __volatile__(
  156                 "mfc0 $k0, $12\n\t"
  157                 "li $k1, 0x00100000\n\t"
  158                 "or $k0, $k0, $k1\n\t"
  159                 "mtc0 $k0, $12\n");
  160         for( ; ; )
  161                 __asm__ __volatile("wait");
  162 }
  163 
  164 #ifdef FDT
  165 /* Parse cmd line args as env - copied from xlp_machdep. */
  166 /* XXX-BZ this should really be centrally provided for all (boot) code. */
  167 static void
  168 _parse_bootargs(char *cmdline)
  169 {
  170         char *n, *v;
  171 
  172         while ((v = strsep(&cmdline, " \n")) != NULL) {
  173                 if (*v == '\0')
  174                         continue;
  175                 if (*v == '-') {
  176                         while (*v != '\0') {
  177                                 v++;
  178                                 switch (*v) {
  179                                 case 'a': boothowto |= RB_ASKNAME; break;
  180                                 /* Someone should simulate that ;-) */
  181                                 case 'C': boothowto |= RB_CDROM; break;
  182                                 case 'd': boothowto |= RB_KDB; break;
  183                                 case 'D': boothowto |= RB_MULTIPLE; break;
  184                                 case 'm': boothowto |= RB_MUTE; break;
  185                                 case 'g': boothowto |= RB_GDB; break;
  186                                 case 'h': boothowto |= RB_SERIAL; break;
  187                                 case 'p': boothowto |= RB_PAUSE; break;
  188                                 case 'r': boothowto |= RB_DFLTROOT; break;
  189                                 case 's': boothowto |= RB_SINGLE; break;
  190                                 case 'v': boothowto |= RB_VERBOSE; break;
  191                                 }
  192                         }
  193                 } else {
  194                         n = strsep(&v, "=");
  195                         if (v == NULL)
  196                                 kern_setenv(n, "1");
  197                         else
  198                                 kern_setenv(n, v);
  199                 }
  200         }
  201 }
  202 #endif
  203 
  204 void
  205 platform_start(__register_t a0, __register_t a1,  __register_t a2, 
  206     __register_t a3)
  207 {
  208         struct bootinfo *bootinfop;
  209         vm_offset_t kernend;
  210         uint64_t platform_counter_freq;
  211         int argc = a0;
  212         char **argv = (char **)a1;
  213         char **envp = (char **)a2;
  214         long memsize;
  215 #ifdef FDT
  216         char buf[2048];         /* early stack supposedly big enough */
  217         vm_offset_t dtbp;
  218         phandle_t chosen;
  219         void *kmdp;
  220 #endif
  221         int i;
  222 
  223         /* clear the BSS and SBSS segments */
  224         kernend = (vm_offset_t)&end;
  225         memset(&edata, 0, kernend - (vm_offset_t)(&edata));
  226 
  227         mips_postboot_fixup();
  228 
  229         mips_pcpu0_init();
  230 
  231         /*
  232          * Over time, we've changed out boot-time binary interface for the
  233          * kernel.  Miniboot simply provides a 'memsize' in a3, whereas the
  234          * FreeBSD boot loader provides a 'bootinfo *' in a3.  While slightly
  235          * grody, we support both here by detecting 'pointer-like' values in
  236          * a3 and assuming physical memory can never be that back.
  237          *
  238          * XXXRW: Pull more values than memsize out of bootinfop -- e.g.,
  239          * module information.
  240          */
  241         if (a3 >= 0x9800000000000000ULL) {
  242                 bootinfop = (void *)a3;
  243                 memsize = bootinfop->bi_memsize;
  244                 preload_metadata = (caddr_t)bootinfop->bi_modulep;
  245         } else {
  246                 bootinfop = NULL;
  247                 memsize = a3;
  248         }
  249 
  250 #ifdef FDT
  251         /*
  252          * Find the dtb passed in by the boot loader (currently fictional).
  253          */
  254         kmdp = preload_search_by_type("elf kernel");
  255         dtbp = MD_FETCH(kmdp, MODINFOMD_DTBP, vm_offset_t);
  256 
  257 #if defined(FDT_DTB_STATIC)
  258         /*
  259          * In case the device tree blob was not retrieved (from metadata) try
  260          * to use the statically embedded one.
  261          */
  262         if (dtbp == (vm_offset_t)NULL)
  263                 dtbp = (vm_offset_t)&fdt_static_dtb;
  264 #else
  265 #error  "Non-static FDT not yet supported on BERI"
  266 #endif
  267 
  268         if (OF_install(OFW_FDT, 0) == FALSE)
  269                 while (1);
  270         if (OF_init((void *)dtbp) != 0)
  271                 while (1);
  272 
  273         /*
  274          * Configure more boot-time parameters passed in by loader.
  275          */
  276         boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
  277         init_static_kenv(MD_FETCH(kmdp, MODINFOMD_ENVP, char *), 0);
  278 
  279         /*
  280          * Get bootargs from FDT if specified.
  281          */
  282         chosen = OF_finddevice("/chosen");
  283         if (OF_getprop(chosen, "bootargs", buf, sizeof(buf)) != -1)
  284                 _parse_bootargs(buf);
  285 #endif
  286 
  287         /*
  288          * XXXRW: We have no way to compare wallclock time to cycle rate on
  289          * BERI, so for now assume we run at the MALTA default (100MHz).
  290          */
  291         platform_counter_freq = MIPS_DEFAULT_HZ;
  292         mips_timer_early_init(platform_counter_freq);
  293 
  294         cninit();
  295         printf("entry: platform_start()\n");
  296 
  297         bootverbose = 1;
  298         if (bootverbose) {
  299                 printf("cmd line: ");
  300                 for (i = 0; i < argc; i++)
  301                         printf("%s ", argv[i]);
  302                 printf("\n");
  303 
  304                 printf("envp:\n");
  305                 for (i = 0; envp[i]; i += 2)
  306                         printf("\t%s = %s\n", envp[i], envp[i+1]);
  307 
  308                 if (bootinfop != NULL)
  309                         printf("bootinfo found at %p\n", bootinfop);
  310 
  311                 printf("memsize = %p\n", (void *)memsize);
  312         }
  313 
  314         realmem = btoc(memsize);
  315         mips_init();
  316 
  317         mips_timer_init_params(platform_counter_freq, 0);
  318 }

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