The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1992, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)vm_extern.h 8.2 (Berkeley) 1/12/94
   32  * $FreeBSD$
   33  */
   34 
   35 #ifndef _VM_EXTERN_H_
   36 #define _VM_EXTERN_H_
   37 
   38 struct pmap;
   39 struct proc;
   40 struct vmspace;
   41 struct vnode;
   42 struct vmem;
   43 
   44 #ifdef _KERNEL
   45 #include <sys/kassert.h>
   46 
   47 struct cdev;
   48 struct cdevsw;
   49 struct domainset;
   50 
   51 /* These operate on kernel virtual addresses only. */
   52 vm_offset_t kva_alloc(vm_size_t);
   53 void kva_free(vm_offset_t, vm_size_t);
   54 
   55 /* These operate on pageable virtual addresses. */
   56 vm_offset_t kmap_alloc_wait(vm_map_t, vm_size_t);
   57 void kmap_free_wakeup(vm_map_t, vm_offset_t, vm_size_t);
   58 
   59 /* These operate on virtual addresses backed by memory. */
   60 void *kmem_alloc_attr(vm_size_t size, int flags,
   61     vm_paddr_t low, vm_paddr_t high, vm_memattr_t memattr);
   62 void *kmem_alloc_attr_domainset(struct domainset *ds, vm_size_t size,
   63     int flags, vm_paddr_t low, vm_paddr_t high, vm_memattr_t memattr);
   64 void *kmem_alloc_contig(vm_size_t size, int flags,
   65     vm_paddr_t low, vm_paddr_t high, u_long alignment, vm_paddr_t boundary,
   66     vm_memattr_t memattr);
   67 void *kmem_alloc_contig_domainset(struct domainset *ds, vm_size_t size,
   68     int flags, vm_paddr_t low, vm_paddr_t high, u_long alignment,
   69     vm_paddr_t boundary, vm_memattr_t memattr);
   70 void *kmem_malloc(vm_size_t size, int flags);
   71 void *kmem_malloc_domainset(struct domainset *ds, vm_size_t size,
   72     int flags);
   73 void kmem_free(void *addr, vm_size_t size);
   74 
   75 /* This provides memory for previously allocated address space. */
   76 int kmem_back(vm_object_t, vm_offset_t, vm_size_t, int);
   77 int kmem_back_domain(int, vm_object_t, vm_offset_t, vm_size_t, int);
   78 void kmem_unback(vm_object_t, vm_offset_t, vm_size_t);
   79 
   80 /* Bootstrapping. */
   81 void kmem_bootstrap_free(vm_offset_t, vm_size_t);
   82 void kmem_subinit(vm_map_t, vm_map_t, vm_offset_t *, vm_offset_t *, vm_size_t,
   83     bool);
   84 void kmem_init(vm_offset_t, vm_offset_t);
   85 void kmem_init_zero_region(void);
   86 void kmeminit(void);
   87 
   88 int kernacc(void *, int, int);
   89 int useracc(void *, int, int);
   90 int vm_fault(vm_map_t map, vm_offset_t vaddr, vm_prot_t fault_type,
   91     int fault_flags, vm_page_t *m_hold);
   92 void vm_fault_copy_entry(vm_map_t, vm_map_t, vm_map_entry_t, vm_map_entry_t,
   93     vm_ooffset_t *);
   94 int vm_fault_disable_pagefaults(void);
   95 void vm_fault_enable_pagefaults(int save);
   96 int vm_fault_quick_hold_pages(vm_map_t map, vm_offset_t addr, vm_size_t len,
   97     vm_prot_t prot, vm_page_t *ma, int max_count);
   98 int vm_fault_trap(vm_map_t map, vm_offset_t vaddr, vm_prot_t fault_type,
   99     int fault_flags, int *signo, int *ucode);
  100 int vm_forkproc(struct thread *, struct proc *, struct thread *,
  101     struct vmspace *, int);
  102 void vm_waitproc(struct proc *);
  103 int vm_mmap(vm_map_t, vm_offset_t *, vm_size_t, vm_prot_t, vm_prot_t, int,
  104     objtype_t, void *, vm_ooffset_t);
  105 int vm_mmap_object(vm_map_t, vm_offset_t *, vm_size_t, vm_prot_t,
  106     vm_prot_t, int, vm_object_t, vm_ooffset_t, boolean_t, struct thread *);
  107 int vm_mmap_to_errno(int rv);
  108 int vm_mmap_cdev(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *,
  109     int *, struct cdev *, struct cdevsw *, vm_ooffset_t *, vm_object_t *);
  110 int vm_mmap_vnode(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *, int *,
  111     struct vnode *, vm_ooffset_t *, vm_object_t *, boolean_t *);
  112 void vm_set_page_size(void);
  113 void vm_sync_icache(vm_map_t, vm_offset_t, vm_size_t);
  114 typedef int (*pmap_pinit_t)(struct pmap *pmap);
  115 struct vmspace *vmspace_alloc(vm_offset_t, vm_offset_t, pmap_pinit_t);
  116 struct vmspace *vmspace_fork(struct vmspace *, vm_ooffset_t *);
  117 int vmspace_exec(struct proc *, vm_offset_t, vm_offset_t);
  118 int vmspace_unshare(struct proc *);
  119 void vmspace_exit(struct thread *);
  120 struct vmspace *vmspace_acquire_ref(struct proc *);
  121 void vmspace_free(struct vmspace *);
  122 void vmspace_exitfree(struct proc *);
  123 void vmspace_switch_aio(struct vmspace *);
  124 void vnode_pager_setsize(struct vnode *, vm_ooffset_t);
  125 void vnode_pager_purge_range(struct vnode *, vm_ooffset_t, vm_ooffset_t);
  126 int vslock(void *, size_t);
  127 void vsunlock(void *, size_t);
  128 struct sf_buf *vm_imgact_map_page(vm_object_t object, vm_ooffset_t offset);
  129 void vm_imgact_unmap_page(struct sf_buf *sf);
  130 void vm_thread_dispose(struct thread *td);
  131 int vm_thread_new(struct thread *td, int pages);
  132 void vm_thread_stack_back(struct domainset *ds, vm_offset_t kaddr,
  133     vm_page_t ma[], int npages, int req_class);
  134 u_int vm_active_count(void);
  135 u_int vm_inactive_count(void);
  136 u_int vm_laundry_count(void);
  137 u_int vm_wait_count(void);
  138 
  139 /*
  140  * Is pa a multiple of alignment, which is a power-of-two?
  141  */
  142 static inline bool
  143 vm_addr_align_ok(vm_paddr_t pa, u_long alignment)
  144 {
  145         KASSERT(powerof2(alignment), ("%s: alignment is not a power of 2: %#lx",
  146             __func__, alignment));
  147         return ((pa & (alignment - 1)) == 0);
  148 }
  149 
  150 /*
  151  * Do the first and last addresses of a range match in all bits except the ones
  152  * in -boundary (a power-of-two)?  For boundary == 0, all addresses match.
  153  */
  154 static inline bool
  155 vm_addr_bound_ok(vm_paddr_t pa, vm_paddr_t size, vm_paddr_t boundary)
  156 {
  157         KASSERT(powerof2(boundary), ("%s: boundary is not a power of 2: %#jx",
  158             __func__, (uintmax_t)boundary));
  159         return (((pa ^ (pa + size - 1)) & -boundary) == 0);
  160 }
  161 
  162 static inline bool
  163 vm_addr_ok(vm_paddr_t pa, vm_paddr_t size, u_long alignment,
  164     vm_paddr_t boundary)
  165 {
  166         return (vm_addr_align_ok(pa, alignment) &&
  167             vm_addr_bound_ok(pa, size, boundary));
  168 }
  169 #endif                          /* _KERNEL */
  170 #endif                          /* !_VM_EXTERN_H_ */

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