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mm.h revision 1.4 
      1 /*	$NetBSD: mm.h,v 1.4 2014/12/14 23:48:58 chs Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _LINUX_MM_H_
     33 #define _LINUX_MM_H_
     34 
     35 #include <sys/kauth.h>
     36 #include <sys/file.h>
     37 #include <sys/mman.h>
     38 #include <sys/proc.h>
     39 #include <sys/vnode.h>
     40 
     41 #include <miscfs/specfs/specdev.h>
     42 
     43 #include <uvm/uvm_extern.h>
     44 
     45 #include <asm/page.h>
     46 
     47 /* XXX Ugh bletch!  Whattakludge!  Linux's sense is reversed...  */
     48 #undef	PAGE_MASK
     49 #define	PAGE_MASK	(~(PAGE_SIZE-1))
     50 
     51 #define	PAGE_ALIGN(x)		(((x) + (PAGE_SIZE-1)) & ~(PAGE_SIZE-1))
     52 #define	offset_in_page(x)	((x) & (PAGE_SIZE-1))
     53 
     54 struct sysinfo {
     55 	unsigned long totalram;
     56 	unsigned long totalhigh;
     57 	uint32_t mem_unit;
     58 };
     59 
     60 static inline void
     61 si_meminfo(struct sysinfo *si)
     62 {
     63 
     64 	si->totalram = uvmexp.npages;
     65 	si->totalhigh = kernel_map->size >> PAGE_SHIFT;
     66 	si->mem_unit = PAGE_SIZE;
     67 	/* XXX Fill in more as needed.  */
     68 }
     69 
     70 /*
     71  * ###################################################################
     72  * ############### XXX THIS NEEDS SERIOUS SCRUTINY XXX ###############
     73  * ###################################################################
     74  */
     75 
     76 /*
     77  * XXX unsigned long is a loser but will probably work accidentally.
     78  * XXX struct file might not map quite right between Linux and NetBSD.
     79  * XXX This is large enough it should take its own file.
     80  */
     81 
     82 static inline unsigned long
     83 vm_mmap(struct file *file, unsigned long base, unsigned long size,
     84     unsigned long prot, unsigned long flags, unsigned long token)
     85 {
     86 	struct vnode *vp;
     87 	void *addr;
     88 	int error;
     89 
     90 	/*
     91 	 * Cargo-culted from sys_mmap.  Various conditions kasserted
     92 	 * rather than checked for expedience and safey.
     93 	 */
     94 
     95 	KASSERT(base == 0);
     96 	KASSERT(prot == (PROT_READ | PROT_WRITE));
     97 	KASSERT(flags == MAP_SHARED);
     98 
     99 	KASSERT(file->f_type == DTYPE_VNODE);
    100 	vp = file->f_data;
    101 
    102 	KASSERT(vp->v_type == VCHR);
    103 	KASSERT((file->f_flag & (FREAD | FWRITE)) == (FREAD | FWRITE));
    104 
    105 	/* XXX pax_mprotect?  pax_aslr?  */
    106 
    107 	addr = NULL;
    108 	error = uvm_mmap_dev(curproc, &addr, size, vp->v_rdev, (off_t)base);
    109 	if (error)
    110 		goto out;
    111 
    112 	KASSERT((uintptr_t)addr <= -1024UL); /* XXX Kludgerosity!  */
    113 
    114 out:	/* XXX errno NetBSD->Linux (kludgerific) */
    115 	return (error? (-error) : (unsigned long)addr);
    116 }
    117 
    118 #endif  /* _LINUX_MM_H_ */
    119