/*      $NetBSD: uvm_init.c,v 1.60 2025/11/05 00:39:46 thorpej 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 1.60 2025/11/05 00:39:46 thorpej 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)
{
        static bool uvm_md_initialized;

        if (! uvm_md_initialized) {
                uvm_setpagesize(); /* initialize PAGE_SIZE-dependent vars */
                uvm_physseg_init();
                uvm_md_initialized = true;
        }
}

/*
 * 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);
}