FreeBSD/Linux Kernel Cross Reference
sys/mips/idt/idt_machdep.c

     /*-
      * Copyright (C) 2007 by Oleksandr Tymoshenko. 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 ``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 HIS RELATIVES 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 MIND, 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.
     *
     * $Id: $
     * 
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #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/cache.h>
    #include <machine/clock.h>
    #include <machine/cpu.h>
    #include <machine/cpuinfo.h>
    #include <machine/cpufunc.h>
    #include <machine/cpuregs.h>
    #include <machine/hwfunc.h>
    #include <machine/intr_machdep.h>
    #include <machine/locore.h>
    #include <machine/md_var.h>
    #include <machine/pte.h>
    #include <machine/sigframe.h>
    #include <machine/trap.h>
    #include <machine/vmparam.h>
    
    extern int      *edata;
    extern int      *end;
    
    void
    platform_cpu_init()
    {
            /* Nothing special */
    }
    
    void
    platform_reset(void)
    {
            volatile unsigned int * p = (void *)0xb8008000;
            /* 
             * TODO: we should take care of TLB stuff here. Otherwise
             * board does not boots properly next time
             */
    
            /* Write 0x8000_0001 to the Reset register */
            *p = 0x80000001;
    
            __asm __volatile("li    $25, 0xbfc00000");
            __asm __volatile("j     $25");
    }
    
    void
   platform_start(__register_t a0, __register_t a1,
       __register_t a2 __unused, __register_t a3 __unused)
   {
           uint64_t platform_counter_freq;
           vm_offset_t kernend;
           int argc = a0;
           char **argv = (char **)a1;
           int i, mem;
   
   
           /* clear the BSS and SBSS segments */
           kernend = (vm_offset_t)&end;
           memset(&edata, 0, kernend - (vm_offset_t)(&edata));
   
           mips_postboot_fixup();
   
           /* Initialize pcpu stuff */
           mips_pcpu0_init();
   
           /*
            * Looking for mem=XXM argument
            */
           mem = 0; /* Just something to start with */
           for (i=0; i < argc; i++) {
                   if (strncmp(argv[i], "mem=", 4) == 0) {
                           mem = strtol(argv[i] + 4, NULL, 0);
                           break;
                   }
           }
   
           bootverbose = 1;
           if (mem > 0)
                   realmem = btoc(mem << 20);
           else
                   realmem = btoc(32 << 20);
   
           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;
   
           /* 
            * ns8250 uart code uses DELAY so ticker should be inititalized 
            * before cninit. And tick_init_params refers to hz, so * init_param1 
            * should be called first.
            */
           init_param1();
           /* TODO: parse argc,argv */
           platform_counter_freq = 330000000UL;
           mips_timer_init_params(platform_counter_freq, 1);
           cninit();
           /* Panic here, after cninit */ 
           if (mem == 0)
                   panic("No mem=XX parameter in arguments");
   
           printf("cmd line: ");
           for (i=0; i < argc; i++)
                   printf("%s ", argv[i]);
           printf("\n");
   
           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
   }

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