FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_extern.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1992, 1993
      *      The Regents of the University of California.  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.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
     *
     *      @(#)vm_extern.h 8.2 (Berkeley) 1/12/94
     * $FreeBSD$
     */
    
    #ifndef _VM_EXTERN_H_
    #define _VM_EXTERN_H_
    
    struct pmap;
    struct proc;
    struct vmspace;
    struct vnode;
    struct vmem;
    
    #ifdef _KERNEL
    #include <sys/kassert.h>
    
    struct cdev;
    struct cdevsw;
    struct domainset;
    
    /* These operate on kernel virtual addresses only. */
    vm_offset_t kva_alloc(vm_size_t);
    void kva_free(vm_offset_t, vm_size_t);
    
    /* These operate on pageable virtual addresses. */
    vm_offset_t kmap_alloc_wait(vm_map_t, vm_size_t);
    void kmap_free_wakeup(vm_map_t, vm_offset_t, vm_size_t);
    
    /* These operate on virtual addresses backed by memory. */
    void *kmem_alloc_attr(vm_size_t size, int flags,
        vm_paddr_t low, vm_paddr_t high, vm_memattr_t memattr);
    void *kmem_alloc_attr_domainset(struct domainset *ds, vm_size_t size,
        int flags, vm_paddr_t low, vm_paddr_t high, vm_memattr_t memattr);
    void *kmem_alloc_contig(vm_size_t size, int flags,
        vm_paddr_t low, vm_paddr_t high, u_long alignment, vm_paddr_t boundary,
        vm_memattr_t memattr);
    void *kmem_alloc_contig_domainset(struct domainset *ds, vm_size_t size,
        int flags, vm_paddr_t low, vm_paddr_t high, u_long alignment,
        vm_paddr_t boundary, vm_memattr_t memattr);
    void *kmem_malloc(vm_size_t size, int flags);
    void *kmem_malloc_domainset(struct domainset *ds, vm_size_t size,
        int flags);
    void kmem_free(void *addr, vm_size_t size);
    
    /* This provides memory for previously allocated address space. */
    int kmem_back(vm_object_t, vm_offset_t, vm_size_t, int);
    int kmem_back_domain(int, vm_object_t, vm_offset_t, vm_size_t, int);
    void kmem_unback(vm_object_t, vm_offset_t, vm_size_t);
    
    /* Bootstrapping. */
    void kmem_bootstrap_free(vm_offset_t, vm_size_t);
    void kmem_subinit(vm_map_t, vm_map_t, vm_offset_t *, vm_offset_t *, vm_size_t,
        bool);
    void kmem_init(vm_offset_t, vm_offset_t);
    void kmem_init_zero_region(void);
    void kmeminit(void);
    
    int kernacc(void *, int, int);
    int useracc(void *, int, int);
    int vm_fault(vm_map_t map, vm_offset_t vaddr, vm_prot_t fault_type,
        int fault_flags, vm_page_t *m_hold);
    void vm_fault_copy_entry(vm_map_t, vm_map_t, vm_map_entry_t, vm_map_entry_t,
        vm_ooffset_t *);
    int vm_fault_disable_pagefaults(void);
    void vm_fault_enable_pagefaults(int save);
    int vm_fault_quick_hold_pages(vm_map_t map, vm_offset_t addr, vm_size_t len,
        vm_prot_t prot, vm_page_t *ma, int max_count);
    int vm_fault_trap(vm_map_t map, vm_offset_t vaddr, vm_prot_t fault_type,
        int fault_flags, int *signo, int *ucode);
   int vm_forkproc(struct thread *, struct proc *, struct thread *,
       struct vmspace *, int);
   void vm_waitproc(struct proc *);
   int vm_mmap(vm_map_t, vm_offset_t *, vm_size_t, vm_prot_t, vm_prot_t, int,
       objtype_t, void *, vm_ooffset_t);
   int vm_mmap_object(vm_map_t, vm_offset_t *, vm_size_t, vm_prot_t,
       vm_prot_t, int, vm_object_t, vm_ooffset_t, boolean_t, struct thread *);
   int vm_mmap_to_errno(int rv);
   int vm_mmap_cdev(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *,
       int *, struct cdev *, struct cdevsw *, vm_ooffset_t *, vm_object_t *);
   int vm_mmap_vnode(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *, int *,
       struct vnode *, vm_ooffset_t *, vm_object_t *, boolean_t *);
   void vm_set_page_size(void);
   void vm_sync_icache(vm_map_t, vm_offset_t, vm_size_t);
   typedef int (*pmap_pinit_t)(struct pmap *pmap);
   struct vmspace *vmspace_alloc(vm_offset_t, vm_offset_t, pmap_pinit_t);
   struct vmspace *vmspace_fork(struct vmspace *, vm_ooffset_t *);
   int vmspace_exec(struct proc *, vm_offset_t, vm_offset_t);
   int vmspace_unshare(struct proc *);
   void vmspace_exit(struct thread *);
   struct vmspace *vmspace_acquire_ref(struct proc *);
   void vmspace_free(struct vmspace *);
   void vmspace_exitfree(struct proc *);
   void vmspace_switch_aio(struct vmspace *);
   void vnode_pager_setsize(struct vnode *, vm_ooffset_t);
   void vnode_pager_purge_range(struct vnode *, vm_ooffset_t, vm_ooffset_t);
   int vslock(void *, size_t);
   void vsunlock(void *, size_t);
   struct sf_buf *vm_imgact_map_page(vm_object_t object, vm_ooffset_t offset);
   void vm_imgact_unmap_page(struct sf_buf *sf);
   void vm_thread_dispose(struct thread *td);
   int vm_thread_new(struct thread *td, int pages);
   void vm_thread_stack_back(struct domainset *ds, vm_offset_t kaddr,
       vm_page_t ma[], int npages, int req_class);
   u_int vm_active_count(void);
   u_int vm_inactive_count(void);
   u_int vm_laundry_count(void);
   u_int vm_wait_count(void);
   
   /*
    * Is pa a multiple of alignment, which is a power-of-two?
    */
   static inline bool
   vm_addr_align_ok(vm_paddr_t pa, u_long alignment)
   {
           KASSERT(powerof2(alignment), ("%s: alignment is not a power of 2: %#lx",
               __func__, alignment));
           return ((pa & (alignment - 1)) == 0);
   }
   
   /*
    * Do the first and last addresses of a range match in all bits except the ones
    * in -boundary (a power-of-two)?  For boundary == 0, all addresses match.
    */
   static inline bool
   vm_addr_bound_ok(vm_paddr_t pa, vm_paddr_t size, vm_paddr_t boundary)
   {
           KASSERT(powerof2(boundary), ("%s: boundary is not a power of 2: %#jx",
               __func__, (uintmax_t)boundary));
           return (((pa ^ (pa + size - 1)) & -boundary) == 0);
   }
   
   static inline bool
   vm_addr_ok(vm_paddr_t pa, vm_paddr_t size, u_long alignment,
       vm_paddr_t boundary)
   {
           return (vm_addr_align_ok(pa, alignment) &&
               vm_addr_bound_ok(pa, size, boundary));
   }
   #endif                          /* _KERNEL */
   #endif                          /* !_VM_EXTERN_H_ */

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