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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2006 Wojciech A. Koszek <wkoszek@FreeBSD.org>
    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 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: stable/12/sys/mips/gxemul/gxemul_machdep.c 326259 2017-11-27 15:07:26Z pfg $");
   30 
   31 #include "opt_ddb.h"
   32 
   33 #include <sys/param.h>
   34 #include <sys/conf.h>
   35 #include <sys/kernel.h>
   36 #include <sys/systm.h>
   37 #include <sys/imgact.h>
   38 #include <sys/bio.h>
   39 #include <sys/buf.h>
   40 #include <sys/bus.h>
   41 #include <sys/cpu.h>
   42 #include <sys/cons.h>
   43 #include <sys/exec.h>
   44 #include <sys/ucontext.h>
   45 #include <sys/proc.h>
   46 #include <sys/kdb.h>
   47 #include <sys/ptrace.h>
   48 #include <sys/reboot.h>
   49 #include <sys/signalvar.h>
   50 #include <sys/sysent.h>
   51 #include <sys/sysproto.h>
   52 #include <sys/user.h>
   53 
   54 #include <vm/vm.h>
   55 #include <vm/vm_object.h>
   56 #include <vm/vm_page.h>
   57 
   58 #include <machine/clock.h>
   59 #include <machine/cpu.h>
   60 #include <machine/cpuregs.h>
   61 #include <machine/hwfunc.h>
   62 #include <machine/md_var.h>
   63 #include <machine/pmap.h>
   64 #include <machine/trap.h>
   65 
   66 #ifdef SMP
   67 #include <sys/smp.h>
   68 #include <machine/smp.h>
   69 #endif
   70 
   71 #include <mips/gxemul/mpreg.h>
   72 
   73 extern int      *edata;
   74 extern int      *end;
   75 
   76 void
   77 platform_cpu_init()
   78 {
   79         /* Nothing special */
   80 }
   81 
   82 static void
   83 mips_init(void)
   84 {
   85         int i;
   86 
   87         for (i = 0; i < 10; i++) {
   88                 phys_avail[i] = 0;
   89         }
   90 
   91         /* phys_avail regions are in bytes */
   92         phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
   93         phys_avail[1] = ctob(realmem);
   94 
   95         dump_avail[0] = phys_avail[0];
   96         dump_avail[1] = phys_avail[1];
   97 
   98         physmem = realmem;
   99 
  100         init_param1();
  101         init_param2(physmem);
  102         mips_cpu_init();
  103         pmap_bootstrap();
  104         mips_proc0_init();
  105         mutex_init();
  106         kdb_init();
  107 #ifdef KDB
  108         if (boothowto & RB_KDB)
  109                 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
  110 #endif
  111 }
  112 
  113 /*
  114  * Perform a board-level soft-reset.
  115  *
  116  * XXXRW: Does gxemul have a moral equivalent to board-level reset?
  117  */
  118 void
  119 platform_reset(void)
  120 {
  121 
  122         panic("%s: not yet", __func__);
  123 }
  124 
  125 void
  126 platform_start(__register_t a0, __register_t a1,  __register_t a2, 
  127     __register_t a3)
  128 {
  129         vm_offset_t kernend;
  130         uint64_t platform_counter_freq;
  131         int argc = a0;
  132         char **argv = (char **)a1;
  133         char **envp = (char **)a2;
  134         int i;
  135 
  136         /* clear the BSS and SBSS segments */
  137         kernend = (vm_offset_t)&end;
  138         memset(&edata, 0, kernend - (vm_offset_t)(&edata));
  139 
  140         mips_postboot_fixup();
  141 
  142         mips_pcpu0_init();
  143 
  144         /*
  145          * XXXRW: Support for the gxemul real-time clock required in order to
  146          * usefully determine our emulated timer frequency.  Go with something
  147          * classic as the default in the mean time.
  148          */
  149         platform_counter_freq = MIPS_DEFAULT_HZ;
  150         mips_timer_early_init(platform_counter_freq);
  151 
  152         cninit();
  153         printf("entry: platform_start()\n");
  154 
  155         bootverbose = 1;
  156         if (bootverbose) {
  157                 printf("cmd line: ");
  158                 for (i = 0; i < argc; i++)
  159                         printf("%s ", argv[i]);
  160                 printf("\n");
  161 
  162                 if (envp != NULL) {
  163                         printf("envp:\n");
  164                         for (i = 0; envp[i]; i += 2)
  165                                 printf("\t%s = %s\n", envp[i], envp[i+1]);
  166                 } else {
  167                         printf("no envp.\n");
  168                 }
  169         }
  170 
  171         realmem = btoc(GXEMUL_MP_DEV_READ(GXEMUL_MP_DEV_MEMORY));
  172         mips_init();
  173 
  174         mips_timer_init_params(platform_counter_freq, 0);
  175 }
  176 
  177 #ifdef SMP
  178 void
  179 platform_ipi_send(int cpuid)
  180 {
  181         GXEMUL_MP_DEV_WRITE(GXEMUL_MP_DEV_IPI_ONE, (1 << 16) | cpuid);
  182 }
  183 
  184 void
  185 platform_ipi_clear(void)
  186 {
  187         GXEMUL_MP_DEV_WRITE(GXEMUL_MP_DEV_IPI_READ, 0);
  188 }
  189 
  190 int
  191 platform_ipi_hardintr_num(void)
  192 {
  193 
  194         return (GXEMUL_MP_DEV_IPI_INTERRUPT - 2);
  195 }
  196 
  197 int
  198 platform_ipi_softintr_num(void)
  199 {
  200 
  201         return (-1);
  202 }
  203 
  204 struct cpu_group *
  205 platform_smp_topo(void)
  206 {
  207         return (smp_topo_none());
  208 }
  209 
  210 void
  211 platform_init_ap(int cpuid)
  212 {
  213         int ipi_int_mask, clock_int_mask;
  214 
  215         /*
  216          * Unmask the clock and ipi interrupts.
  217          */
  218         clock_int_mask = hard_int_mask(5);
  219         ipi_int_mask = hard_int_mask(platform_ipi_hardintr_num());
  220         set_intr_mask(ipi_int_mask | clock_int_mask);
  221 }
  222 
  223 void
  224 platform_cpu_mask(cpuset_t *mask)
  225 {
  226         unsigned i, n;
  227 
  228         n = GXEMUL_MP_DEV_READ(GXEMUL_MP_DEV_NCPUS);
  229         CPU_ZERO(mask);
  230         for (i = 0; i < n; i++)
  231                 CPU_SET(i, mask);
  232 }
  233 
  234 int
  235 platform_processor_id(void)
  236 {
  237         return (GXEMUL_MP_DEV_READ(GXEMUL_MP_DEV_WHOAMI));
  238 }
  239 
  240 int
  241 platform_start_ap(int cpuid)
  242 {
  243         GXEMUL_MP_DEV_WRITE(GXEMUL_MP_DEV_STARTADDR, (intptr_t)mpentry);
  244         GXEMUL_MP_DEV_WRITE(GXEMUL_MP_DEV_START, cpuid);
  245         return (0);
  246 }
  247 #endif  /* SMP */

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