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mm.h revision 1.18 
      1 /*	$NetBSD: mm.h,v 1.18 2021/12/19 09:56:10 riastradh 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/malloc.h>
     36 
     37 #include <uvm/uvm_extern.h>
     38 #include <uvm/uvm_object.h>
     39 
     40 #include <asm/page.h>
     41 #include <linux/shrinker.h>
     42 #include <linux/slab.h>
     43 #include <linux/sizes.h>
     44 
     45 struct file;
     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 #define	untagged_addr(x)	(x)
     55 
     56 struct sysinfo {
     57 	unsigned long totalram;
     58 	unsigned long totalhigh;
     59 	uint32_t mem_unit;
     60 };
     61 
     62 static inline void
     63 si_meminfo(struct sysinfo *si)
     64 {
     65 
     66 	si->totalram = uvmexp.npages;
     67 	si->totalhigh = kernel_map->size >> PAGE_SHIFT;
     68 	si->mem_unit = PAGE_SIZE;
     69 	/* XXX Fill in more as needed.  */
     70 }
     71 
     72 static inline size_t
     73 si_mem_available(void)
     74 {
     75 
     76 	/* XXX ? */
     77 	return uvmexp.free;
     78 }
     79 
     80 static inline unsigned long
     81 vm_mmap(struct file *file __unused, unsigned long base __unused,
     82     unsigned long size __unused, unsigned long prot __unused,
     83     unsigned long flags __unused, unsigned long token __unused)
     84 {
     85 
     86 	return -ENODEV;
     87 }
     88 
     89 static inline unsigned long
     90 get_num_physpages(void)
     91 {
     92 	return uvmexp.npages;
     93 }
     94 
     95 static inline void *
     96 kvzalloc(size_t size, gfp_t gfp)
     97 {
     98 
     99 	return kmalloc(size, gfp | __GFP_ZERO);
    100 }
    101 
    102 static inline void *
    103 kvmalloc_array(size_t nelem, size_t elemsize, gfp_t gfp)
    104 {
    105 
    106 	KASSERT(elemsize != 0);
    107 	if (nelem > SIZE_MAX/elemsize)
    108 		return NULL;
    109 	return kmalloc(nelem * elemsize, gfp);
    110 }
    111 
    112 /*
    113  * XXX Requires that kmalloc in <linux/slab.h> and vmalloc in
    114  * <linux/vmalloc.h> both use malloc(9).  If you change either of
    115  * those, be sure to update this.
    116  */
    117 static inline void
    118 kvfree(void *ptr)
    119 {
    120 
    121 	if (ptr != NULL)
    122 		free(ptr, M_TEMP);
    123 }
    124 
    125 static inline void
    126 set_page_dirty(struct page *page)
    127 {
    128 	struct vm_page *pg = &page->p_vmp;
    129 
    130 	/* XXX */
    131 	if (pg->uobject != NULL) {
    132 		rw_enter(pg->uobject->vmobjlock, RW_WRITER);
    133 		uvm_pagemarkdirty(pg, UVM_PAGE_STATUS_DIRTY);
    134 		rw_exit(pg->uobject->vmobjlock);
    135 	} else {
    136 		uvm_pagemarkdirty(pg, UVM_PAGE_STATUS_DIRTY);
    137 	}
    138 }
    139 
    140 #endif  /* _LINUX_MM_H_ */
    141