/*      $NetBSD: uvm_init.c,v 1.59 2023/09/23 18:21:12 ad Exp $ */

/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
* 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 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.
*
* from: Id: uvm_init.c,v 1.1.2.3 1998/02/06 05:15:27 chs Exp
*/

/*
* uvm_init.c: init the vm system.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_init.c,v 1.59 2023/09/23 18:21:12 ad Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/debug.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/resourcevar.h>
#include <sys/kmem.h>
#include <sys/mman.h>
#include <sys/vnode.h>
#include <sys/rndsource.h>

#include <uvm/uvm.h>
#include <uvm/uvm_pdpolicy.h>
#include <uvm/uvm_physseg.h>
#include <uvm/uvm_readahead.h>
#include <uvm/uvm_rndsource.h>

/*
* struct uvm: we store most global vars in this structure to make them
* easier to spot...
*/

struct uvm uvm;         /* decl */
struct uvmexp uvmexp;   /* decl */
struct uvm_object *uvm_kernel_object;

#if defined(__uvmexp_pagesize)
const int * const uvmexp_pagesize = &uvmexp.pagesize;
const int * const uvmexp_pagemask = &uvmexp.pagemask;
const int * const uvmexp_pageshift = &uvmexp.pageshift;
#endif

kmutex_t uvm_kentry_lock __cacheline_aligned;

struct krndsource uvm_fault_rndsource;

/*
* uvm_md_init: Init dependant on the MD boot context.
*              called from MD code.
*/

void
uvm_md_init(void)
{
       uvm_setpagesize(); /* initialize PAGE_SIZE-dependent variables */
       uvm_physseg_init();
}

/*
* uvm_init: init the VM system.   called from kern/init_main.c.
*/

void
uvm_init(void)
{
       vaddr_t kvm_start, kvm_end;

       /*
        * Ensure that the hardware set the page size, zero the UVM structure.
        */

       if (uvmexp.pagesize == 0) {
               panic("uvm_init: page size not set");
       }

       memset(&uvm, 0, sizeof(uvm));
       averunnable.fscale = FSCALE;

       /*
        * Init the page sub-system.  This includes allocating the vm_page
        * structures, and setting up all the page queues (and locks).
        * Available memory will be put in the "free" queue, kvm_start and
        * kvm_end will be set to the area of kernel virtual memory which
        * is available for general use.
        */

       uvm_page_init(&kvm_start, &kvm_end);
       uvm_pglistalloc_init();

       /*
        * Init the map sub-system.
        */

       uvm_map_init();

       /*
        * Setup the kernel's virtual memory data structures.  This includes
        * setting up the kernel_map/kernel_object.
        * Bootstrap all kernel memory allocators.
        */

       uao_init();
       uvm_km_bootstrap(kvm_start, kvm_end);

       /*
        * Setup uvm_map caches and init the amap.
        */

       uvm_map_init_caches();
       uvm_amap_init();

       /*
        * Init the pmap module.  The pmap module is free to allocate
        * memory for its private use (e.g. pvlists).
        */

       pmap_init();

       /*
        * Make kernel memory allocators ready for use.
        * After this call the pool/kmem memory allocators can be used.
        */

       uvm_km_init();
#ifdef __HAVE_PMAP_PV_TRACK
       pmap_pv_init();
#endif

#ifdef DEBUG
       debug_init();
#endif

       /*
        * Init all pagers and the pager_map.
        */

       uvm_pager_init();

       /*
        * Initialize the uvm_loan() facility.
        */

       uvm_loan_init();

       /*
        * Enable paging of kernel objects.
        * This second pass of initializing kernel_object requires rw_obj,
        * so initialize that first.
        */

       uao_create(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS,
           UAO_FLAG_KERNSWAP);

       uvmpdpol_reinit();

       /*
        * Init anonymous memory systems.
        */

       uvm_anon_init();

       uvm_uarea_init();

       /*
        * Init readahead mechanism.
        */

       uvm_ra_init();

       /*
        * Initialize random source for page fault events.
        */

       rnd_attach_source(&uvm_fault_rndsource, "uvmfault", RND_TYPE_VM,
           RND_FLAG_COLLECT_TIME|RND_FLAG_COLLECT_VALUE|
           RND_FLAG_ESTIMATE_VALUE);
}