FreeBSD/Linux Kernel Cross Reference
sys/i386at/model_dep.c

     /* 
      * Mach Operating System
      * Copyright (c) 1991,1990,1989, 1988 Carnegie Mellon University
      * All Rights Reserved.
      * 
      * Permission to use, copy, modify and distribute this software and its
      * documentation is hereby granted, provided that both the copyright
      * notice and this permission notice appear in all copies of the
      * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie Mellon
     * the rights to redistribute these changes.
     */
    
    /*
     * HISTORY
     * $Log:        model_dep.c,v $
     * Revision 2.11  93/08/10  15:57:58  mrt
     *      Look for the rconsole serial line FIRST.
     *      [93/06/17  22:43:15  rvb]
     * 
     *      Added extern (patchable) use_all_mem variable. It defaults to
     *      0 which limits memory use to 16M. If set to 1 all memory will
     *      be used, but DMA from higher memory does not work.
     *      [93/06/08            rvb]
     * 
     * Revision 2.10  93/05/15  19:33:02  mrt
     *      machparam.h -> machspl.h
     * 
     * Revision 2.9  93/01/14  17:31:41  danner
     *      Proper spl typing.
     *      [92/11/30            af]
     * 
     * Revision 2.8  92/07/09  22:54:52  rvb
     *      GROSS temporary (?) hack to limit memory to 16Meg to not freak
     *      out ISA machines doing dma.
     *      [92/06/18            rvb]
     * 
     * Revision 2.7  92/01/03  20:11:49  dbg
     *      Fixed so that mem_size can be patched to limit physical memory
     *      use.
     *      [91/09/29            dbg]
     * 
     *      Rename kdb_init to ddb_init.  Remove esym.
     *      [91/09/11            dbg]
     * 
     * Revision 2.6  91/07/31  17:42:41  dbg
     *      Remove call to pcb_module_init (in machine-independent code).
     *      [91/07/26            dbg]
     * 
     * Revision 2.5  91/06/19  11:55:48  rvb
     *      cputypes.h->platforms.h
     *      [91/06/12  13:45:37  rvb]
     * 
     * Revision 2.4  91/05/18  14:30:38  rpd
     *      Changed pmap_bootstrap arguments.
     *      Moved pmap_free_pages and pmap_next_page here.
     *      [91/05/15            rpd]
     * 
     * Revision 2.3  91/05/14  16:29:13  mrt
     *      Correcting copyright
     * 
     * Revision 2.2  91/05/08  12:44:52  dbg
     *      Initialization for i386 AT bus machines only.
     *      Combine code that was in i386/init.c and i386/i386_init.c.
     *      [91/04/26  14:40:43  dbg]
     * 
     * Revision 2.3  90/09/23  17:45:10  jsb
     *      Added support for iPSC2.
     *      [90/09/21  16:39:41  jsb]
     * 
     * Revision 2.2  90/05/03  15:27:39  dbg
     *      Alter for pure kernel.
     *      [90/02/15            dbg]
     * 
     * Revision 1.5.1.4  90/02/01  13:36:37  rvb
     *      esym must always be defined.  This is as good a place as any.
     *      [90/01/31            rvb]
     * 
     * Revision 1.5.1.3  89/12/28  12:43:10  rvb
     *      Fix av_start & esym initialization, esp for MACH_KDB.
     *      [89/12/26            rvb]
     * 
     * Revision 1.5.1.2  89/12/21  17:59:49  rvb
     *      enable esym processing.
     * 
     * 
    * Revision 1.5.1.1  89/10/22  11:30:41  rvb
    *      Setup of rootdevice should not be here.  And it was wrong.
    *      [89/10/17            rvb]
    * 
    *      Scary!  We've changed sbss to edata.  AND the coff loader
    *      following the vuifile spec was actually aligning the bss 
    *      on 4k boundaries.
    *      [89/10/16            rvb]
    * 
    * Revision 1.5  89/04/05  12:57:39  rvb
    *      Move extern out of function scope for gcc.
    *      [89/03/04            rvb]
    * 
    * Revision 1.4  89/02/26  12:31:25  gm0w
    *      Changes for cleanup.
    * 
    * 31-Dec-88  Robert Baron (rvb) at Carnegie-Mellon University
    *      Derived from MACH2.0 vax release.
    *
    */
   
   /*
    *      File:   model_dep.c
    *      Author: Avadis Tevanian, Jr., Michael Wayne Young
    *
    *      Copyright (C) 1986, Avadis Tevanian, Jr., Michael Wayne Young
    *
    *      Basic initialization for I386 - ISA bus machines.
    */
   
   #include <platforms.h>
   #include <mach_kdb.h>
   
   #include <mach/i386/vm_param.h>
   
   #include <mach/vm_param.h>
   #include <mach/vm_prot.h>
   #include <mach/machine.h>
   #include <kern/time_out.h>
   #include <sys/time.h>
   #include <vm/vm_page.h>
   #include <i386/machspl.h>
   
   #if     MACH_KDB
   #include <sys/reboot.h>
   #endif  MACH_KDB
   
   int             loadpt;
   
   vm_size_t       mem_size = 0;
   vm_size_t       rawmem_size;
   vm_offset_t     first_addr = 0; /* set by start.s - keep out of bss */
   vm_offset_t     first_avail = 0;/* first after page tables */
   vm_offset_t     last_addr;
   
   vm_offset_t     avail_start, avail_end;
   vm_offset_t     virtual_avail, virtual_end;
   vm_offset_t     hole_start, hole_end;
   vm_offset_t     avail_next;
   unsigned int    avail_remaining;
   
   /* parameters passed from bootstrap loader */
   int             cnvmem = 0;             /* must be in .data section */
   int             extmem = 0;
   int             boottype = 0;
   
   extern char     edata, end;
   
   extern char     version[];
   
   extern void     setup_main();
   
   void            inittodr();     /* forward */
   
   int             rebootflag = 0; /* exported to kdintr */
   
   /*
    *      Cpu initialization.  Running virtual, but without MACH VM
    *      set up.  First C routine called.
    */
   void machine_startup()
   {
           /*
            * Do basic VM initialization
            */
           i386_init();
   
           /*
            * Initialize the console so we can print.
            */
           cninit();
           proberc();
   #if     MACH_KDB
   
           /*
            * Initialize the kernel debugger.
            */
           ddb_init();
   
           /*
            * Cause a breakpoint trap to the debugger before proceeding
            * any further if the proper option bit was specified in
            * the boot flags.
            *
            * XXX use -a switch to invoke kdb, since there's no
            *     boot-program switch to turn on RB_HALT!
            */
           if (boothowto & RB_ASKNAME)
               Debugger();
   #endif  MACH_KDB
   
           printf(version);
   
           machine_slot[0].is_cpu = TRUE;
           machine_slot[0].running = TRUE;
           machine_slot[0].cpu_type = CPU_TYPE_I386;
           machine_slot[0].cpu_subtype = CPU_SUBTYPE_AT386;
   
           /*
            * Start the system.
            */
           setup_main();
   }
   
   /*
    * Find devices.  The system is alive.
    */
   void machine_init()
   {
           /*
            * Set up to use floating point.
            */
           init_fpu();
   
           /*
            * Find the devices
            */
           probeio();
   
           /*
            * Find the root device
            */
           get_root_device();
   
           /*
            * Get the time
            */
           inittodr();
   }
   
   /*
    * Halt a cpu.
    */
   halt_cpu()
   {
   }
   
   /*
    * Halt the system or reboot.
    */
   halt_all_cpus(reboot)
           boolean_t       reboot;
   {
           if (reboot) {
               /*
                * Tell the BIOS not to clear and test memory.
                */
               *(unsigned short *)phystokv(0x472) = 0x1234;
   
               kdreboot();
           }
           else {
               rebootflag = 1;
               printf("In tight loop: hit ctl-alt-del to reboot\n");
               (void) spl0();
           }
           for (;;)
               continue;
   }
   
   /*
    * Basic VM initialization.
    */
   int use_all_mem = 0;
   i386_init()
   {
           /*
            * Zero the BSS.
            */
           bzero((char *)&edata,(unsigned)(&end - &edata));
   
           /*
            * Initialize the pic prior to any possible call to an spl.
            */
           picinit();
   
           vm_set_page_size();
   
           /*
            * Compute the memory size.
            */
           first_addr = 0x1000;
                   /* BIOS leaves data in low memory */
           last_addr = 1024*1024 + extmem*1024;
                   /* extended memory starts at 1MB */
           if (mem_size != 0) {
               if (mem_size < last_addr - loadpt)
                   last_addr = loadpt + mem_size;
           }
           if ((!use_all_mem) && last_addr - loadpt > 16 * 1024*1024) {
                   printf("************ i386at/model_dep.c: i386_init(); ");
                   printf("Limiting useable memory to 16 Meg to avoid DMA problems.\n");
                   last_addr = loadpt + 16 * 1024*1024;            /* XXX */
           }
   
           mem_size = last_addr - loadpt;
   
           first_addr = round_page(first_addr);
           last_addr = trunc_page(last_addr);
   
           /*
            *      Initialize kernel physical map, mapping the
            *      region from loadpt to avail_start.
            *      Kernel virtual address starts at VM_KERNEL_MIN_ADDRESS.
            */
   
           avail_start = first_addr;
           avail_end = last_addr;
           printf("AT386 boot: memory from 0x%x to 0x%x\n", avail_start,
                           avail_end);
   
           pmap_bootstrap(loadpt);
   
           /*
            *      Initialize for pmap_free_pages and pmap_next_page.
            *      These guys should be page-aligned.
            */
   
           hole_start = trunc_page((vm_offset_t)(1024 * cnvmem));
           hole_end = round_page((vm_offset_t)first_avail);
   
           avail_remaining = atop((avail_end - avail_start) -
                                  (hole_end - hole_start));
           avail_next = avail_start;
   
           printf("i386_init: virtual_avail = %x, virtual_end = %x\n",
                   virtual_avail, virtual_end);
   }
   
   #include <mach/vm_prot.h>
   #include <vm/pmap.h>
   #include <mach/time_value.h>
   
   timemmap(dev,off,prot)
           vm_prot_t prot;
   {
           extern time_value_t *mtime;
   
   #ifdef  lint
           dev++; off++;
   #endif  lint
   
           if (prot & VM_PROT_WRITE) return (-1);
   
           return (i386_btop(pmap_extract(pmap_kernel(), (vm_offset_t) mtime)));
   }
   
   startrtclock()
   {
           clkstart();
   }
   
   void
   inittodr()
   {
           time_value_t    new_time;
   
           new_time.seconds = 0;
           new_time.microseconds = 0;
   
           (void) readtodc(&new_time.seconds);
   
           {
               spl_t       s = splhigh();
               time = new_time;
               splx(s);
           }
   }
   
   void
   resettodr()
   {
           writetodc();
   }
   
   unsigned int pmap_free_pages()
   {
           return avail_remaining;
   }
   
   boolean_t pmap_next_page(addrp)
           vm_offset_t *addrp;
   {
           if (avail_next == avail_end)
                   return FALSE;
   
           /* skip the hole */
   
           if (avail_next == hole_start)
                   avail_next = hole_end;
   
           *addrp = avail_next;
           avail_next += PAGE_SIZE;
           avail_remaining--;
           return TRUE;
   }
   
   boolean_t pmap_valid_page(x)
           vm_offset_t x;
   {
           return (((avail_start <= x) && (x < avail_end)) &&
                   !((hole_start <= x) && (x < hole_end)));
   }

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