FreeBSD/Linux Kernel Cross Reference
sys/mips/gxemul/gxemul_machdep.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2006 Wojciech A. Koszek <wkoszek@FreeBSD.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/12.0/sys/mips/gxemul/gxemul_machdep.c 326259 2017-11-27 15:07:26Z pfg $");
    
    #include "opt_ddb.h"
    
    #include <sys/param.h>
    #include <sys/conf.h>
    #include <sys/kernel.h>
    #include <sys/systm.h>
    #include <sys/imgact.h>
    #include <sys/bio.h>
    #include <sys/buf.h>
    #include <sys/bus.h>
    #include <sys/cpu.h>
    #include <sys/cons.h>
    #include <sys/exec.h>
    #include <sys/ucontext.h>
    #include <sys/proc.h>
    #include <sys/kdb.h>
    #include <sys/ptrace.h>
    #include <sys/reboot.h>
    #include <sys/signalvar.h>
    #include <sys/sysent.h>
    #include <sys/sysproto.h>
    #include <sys/user.h>
    
    #include <vm/vm.h>
    #include <vm/vm_object.h>
    #include <vm/vm_page.h>
    
    #include <machine/clock.h>
    #include <machine/cpu.h>
    #include <machine/cpuregs.h>
    #include <machine/hwfunc.h>
    #include <machine/md_var.h>
    #include <machine/pmap.h>
    #include <machine/trap.h>
    
    #ifdef SMP
    #include <sys/smp.h>
    #include <machine/smp.h>
    #endif
    
    #include <mips/gxemul/mpreg.h>
    
    extern int      *edata;
    extern int      *end;
    
    void
    platform_cpu_init()
    {
            /* Nothing special */
    }
    
    static void
    mips_init(void)
    {
            int i;
    
            for (i = 0; i < 10; i++) {
                    phys_avail[i] = 0;
            }
    
            /* phys_avail regions are in bytes */
            phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
            phys_avail[1] = ctob(realmem);
    
            dump_avail[0] = phys_avail[0];
            dump_avail[1] = phys_avail[1];
    
            physmem = realmem;
    
           init_param1();
           init_param2(physmem);
           mips_cpu_init();
           pmap_bootstrap();
           mips_proc0_init();
           mutex_init();
           kdb_init();
   #ifdef KDB
           if (boothowto & RB_KDB)
                   kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
   #endif
   }
   
   /*
    * Perform a board-level soft-reset.
    *
    * XXXRW: Does gxemul have a moral equivalent to board-level reset?
    */
   void
   platform_reset(void)
   {
   
           panic("%s: not yet", __func__);
   }
   
   void
   platform_start(__register_t a0, __register_t a1,  __register_t a2, 
       __register_t a3)
   {
           vm_offset_t kernend;
           uint64_t platform_counter_freq;
           int argc = a0;
           char **argv = (char **)a1;
           char **envp = (char **)a2;
           int i;
   
           /* clear the BSS and SBSS segments */
           kernend = (vm_offset_t)&end;
           memset(&edata, 0, kernend - (vm_offset_t)(&edata));
   
           mips_postboot_fixup();
   
           mips_pcpu0_init();
   
           /*
            * XXXRW: Support for the gxemul real-time clock required in order to
            * usefully determine our emulated timer frequency.  Go with something
            * classic as the default in the mean time.
            */
           platform_counter_freq = MIPS_DEFAULT_HZ;
           mips_timer_early_init(platform_counter_freq);
   
           cninit();
           printf("entry: platform_start()\n");
   
           bootverbose = 1;
           if (bootverbose) {
                   printf("cmd line: ");
                   for (i = 0; i < argc; i++)
                           printf("%s ", argv[i]);
                   printf("\n");
   
                   if (envp != NULL) {
                           printf("envp:\n");
                           for (i = 0; envp[i]; i += 2)
                                   printf("\t%s = %s\n", envp[i], envp[i+1]);
                   } else {
                           printf("no envp.\n");
                   }
           }
   
           realmem = btoc(GXEMUL_MP_DEV_READ(GXEMUL_MP_DEV_MEMORY));
           mips_init();
   
           mips_timer_init_params(platform_counter_freq, 0);
   }
   
   #ifdef SMP
   void
   platform_ipi_send(int cpuid)
   {
           GXEMUL_MP_DEV_WRITE(GXEMUL_MP_DEV_IPI_ONE, (1 << 16) | cpuid);
   }
   
   void
   platform_ipi_clear(void)
   {
           GXEMUL_MP_DEV_WRITE(GXEMUL_MP_DEV_IPI_READ, 0);
   }
   
   int
   platform_ipi_hardintr_num(void)
   {
   
           return (GXEMUL_MP_DEV_IPI_INTERRUPT - 2);
   }
   
   int
   platform_ipi_softintr_num(void)
   {
   
           return (-1);
   }
   
   struct cpu_group *
   platform_smp_topo(void)
   {
           return (smp_topo_none());
   }
   
   void
   platform_init_ap(int cpuid)
   {
           int ipi_int_mask, clock_int_mask;
   
           /*
            * Unmask the clock and ipi interrupts.
            */
           clock_int_mask = hard_int_mask(5);
           ipi_int_mask = hard_int_mask(platform_ipi_hardintr_num());
           set_intr_mask(ipi_int_mask | clock_int_mask);
   }
   
   void
   platform_cpu_mask(cpuset_t *mask)
   {
           unsigned i, n;
   
           n = GXEMUL_MP_DEV_READ(GXEMUL_MP_DEV_NCPUS);
           CPU_ZERO(mask);
           for (i = 0; i < n; i++)
                   CPU_SET(i, mask);
   }
   
   int
   platform_processor_id(void)
   {
           return (GXEMUL_MP_DEV_READ(GXEMUL_MP_DEV_WHOAMI));
   }
   
   int
   platform_start_ap(int cpuid)
   {
           GXEMUL_MP_DEV_WRITE(GXEMUL_MP_DEV_STARTADDR, (intptr_t)mpentry);
           GXEMUL_MP_DEV_WRITE(GXEMUL_MP_DEV_START, cpuid);
           return (0);
   }
   #endif  /* SMP */

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