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/gxemul/gxemul_machdep.c

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    1 /*-
    2  * Copyright (c) 2006 Wojciech A. Koszek <wkoszek@FreeBSD.org>
    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 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/10.1/sys/mips/gxemul/gxemul_machdep.c 247297 2013-02-26 01:00:11Z attilio $");
   28 
   29 #include "opt_ddb.h"
   30 
   31 #include <sys/param.h>
   32 #include <sys/conf.h>
   33 #include <sys/kernel.h>
   34 #include <sys/systm.h>
   35 #include <sys/imgact.h>
   36 #include <sys/bio.h>
   37 #include <sys/buf.h>
   38 #include <sys/bus.h>
   39 #include <sys/cpu.h>
   40 #include <sys/cons.h>
   41 #include <sys/exec.h>
   42 #include <sys/ucontext.h>
   43 #include <sys/proc.h>
   44 #include <sys/kdb.h>
   45 #include <sys/ptrace.h>
   46 #include <sys/reboot.h>
   47 #include <sys/signalvar.h>
   48 #include <sys/sysent.h>
   49 #include <sys/sysproto.h>
   50 #include <sys/user.h>
   51 
   52 #include <vm/vm.h>
   53 #include <vm/vm_object.h>
   54 #include <vm/vm_page.h>
   55 
   56 #include <machine/clock.h>
   57 #include <machine/cpu.h>
   58 #include <machine/cpuregs.h>
   59 #include <machine/hwfunc.h>
   60 #include <machine/md_var.h>
   61 #include <machine/pmap.h>
   62 #include <machine/trap.h>
   63 
   64 #ifdef SMP
   65 #include <sys/smp.h>
   66 #include <machine/smp.h>
   67 #endif
   68 
   69 #include <mips/gxemul/mpreg.h>
   70 
   71 extern int      *edata;
   72 extern int      *end;
   73 
   74 void
   75 platform_cpu_init()
   76 {
   77         /* Nothing special */
   78 }
   79 
   80 static void
   81 mips_init(void)
   82 {
   83         int i;
   84 
   85         for (i = 0; i < 10; i++) {
   86                 phys_avail[i] = 0;
   87         }
   88 
   89         /* phys_avail regions are in bytes */
   90         phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
   91         phys_avail[1] = ctob(realmem);
   92 
   93         dump_avail[0] = phys_avail[0];
   94         dump_avail[1] = phys_avail[1];
   95 
   96         physmem = realmem;
   97 
   98         init_param1();
   99         init_param2(physmem);
  100         mips_cpu_init();
  101         pmap_bootstrap();
  102         mips_proc0_init();
  103         mutex_init();
  104         kdb_init();
  105 #ifdef KDB
  106         if (boothowto & RB_KDB)
  107                 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
  108 #endif
  109 }
  110 
  111 /*
  112  * Perform a board-level soft-reset.
  113  *
  114  * XXXRW: Does gxemul have a moral equivalent to board-level reset?
  115  */
  116 void
  117 platform_reset(void)
  118 {
  119 
  120         panic("%s: not yet", __func__);
  121 }
  122 
  123 void
  124 platform_start(__register_t a0, __register_t a1,  __register_t a2, 
  125     __register_t a3)
  126 {
  127         vm_offset_t kernend;
  128         uint64_t platform_counter_freq;
  129         int argc = a0;
  130         char **argv = (char **)a1;
  131         char **envp = (char **)a2;
  132         int i;
  133 
  134         /* clear the BSS and SBSS segments */
  135         kernend = (vm_offset_t)&end;
  136         memset(&edata, 0, kernend - (vm_offset_t)(&edata));
  137 
  138         mips_postboot_fixup();
  139 
  140         mips_pcpu0_init();
  141 
  142         /*
  143          * XXXRW: Support for the gxemul real-time clock required in order to
  144          * usefully determine our emulated timer frequency.  Go with something
  145          * classic as the default in the mean time.
  146          */
  147         platform_counter_freq = MIPS_DEFAULT_HZ;
  148         mips_timer_early_init(platform_counter_freq);
  149 
  150         cninit();
  151         printf("entry: platform_start()\n");
  152 
  153         bootverbose = 1;
  154         if (bootverbose) {
  155                 printf("cmd line: ");
  156                 for (i = 0; i < argc; i++)
  157                         printf("%s ", argv[i]);
  158                 printf("\n");
  159 
  160                 if (envp != NULL) {
  161                         printf("envp:\n");
  162                         for (i = 0; envp[i]; i += 2)
  163                                 printf("\t%s = %s\n", envp[i], envp[i+1]);
  164                 } else {
  165                         printf("no envp.\n");
  166                 }
  167         }
  168 
  169         realmem = btoc(GXEMUL_MP_DEV_READ(GXEMUL_MP_DEV_MEMORY));
  170         mips_init();
  171 
  172         mips_timer_init_params(platform_counter_freq, 0);
  173 }
  174 
  175 #ifdef SMP
  176 void
  177 platform_ipi_send(int cpuid)
  178 {
  179         GXEMUL_MP_DEV_WRITE(GXEMUL_MP_DEV_IPI_ONE, (1 << 16) | cpuid);
  180 }
  181 
  182 void
  183 platform_ipi_clear(void)
  184 {
  185         GXEMUL_MP_DEV_WRITE(GXEMUL_MP_DEV_IPI_READ, 0);
  186 }
  187 
  188 int
  189 platform_ipi_intrnum(void)
  190 {
  191         return (GXEMUL_MP_DEV_IPI_INTERRUPT - 2);
  192 }
  193 
  194 struct cpu_group *
  195 platform_smp_topo(void)
  196 {
  197         return (smp_topo_none());
  198 }
  199 
  200 void
  201 platform_init_ap(int cpuid)
  202 {
  203         int ipi_int_mask, clock_int_mask;
  204 
  205         /*
  206          * Unmask the clock and ipi interrupts.
  207          */
  208         clock_int_mask = hard_int_mask(5);
  209         ipi_int_mask = hard_int_mask(platform_ipi_intrnum());
  210         set_intr_mask(ipi_int_mask | clock_int_mask);
  211 }
  212 
  213 void
  214 platform_cpu_mask(cpuset_t *mask)
  215 {
  216         unsigned i, n;
  217 
  218         n = GXEMUL_MP_DEV_READ(GXEMUL_MP_DEV_NCPUS);
  219         CPU_ZERO(mask);
  220         for (i = 0; i < n; i++)
  221                 CPU_SET(i, mask);
  222 }
  223 
  224 int
  225 platform_processor_id(void)
  226 {
  227         return (GXEMUL_MP_DEV_READ(GXEMUL_MP_DEV_WHOAMI));
  228 }
  229 
  230 int
  231 platform_start_ap(int cpuid)
  232 {
  233         GXEMUL_MP_DEV_WRITE(GXEMUL_MP_DEV_STARTADDR, (intptr_t)mpentry);
  234         GXEMUL_MP_DEV_WRITE(GXEMUL_MP_DEV_START, cpuid);
  235         return (0);
  236 }
  237 #endif  /* SMP */

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