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      1 /*	$NetBSD: mm.h,v 1.24 2021/12/19 12:21:30 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 <uvm/uvm_extern.h>
     36 #include <uvm/uvm_object.h>
     37 
     38 #include <asm/page.h>
     39 
     40 #include <linux/pfn.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)	((uintptr_t)(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 totalram_pages(void)
     91 {
     92 
     93 	return uvmexp.npages;
     94 }
     95 
     96 static inline unsigned long
     97 get_num_physpages(void)
     98 {
     99 
    100 	return uvmexp.npages;
    101 }
    102 
    103 static inline void *
    104 kvmalloc(size_t size, gfp_t gfp)
    105 {
    106 
    107 	return kmalloc(size, gfp);
    108 }
    109 
    110 static inline void *
    111 kvzalloc(size_t size, gfp_t gfp)
    112 {
    113 
    114 	return kmalloc(size, gfp | __GFP_ZERO);
    115 }
    116 
    117 static inline void *
    118 kvcalloc(size_t nelem, size_t elemsize, gfp_t gfp)
    119 {
    120 
    121 	KASSERT(elemsize > 0);
    122 	if (SIZE_MAX/elemsize < nelem)
    123 		return NULL;
    124 	return kvzalloc(nelem * elemsize, gfp);
    125 }
    126 
    127 static inline void *
    128 kvmalloc_array(size_t nelem, size_t elemsize, gfp_t gfp)
    129 {
    130 
    131 	KASSERT(elemsize != 0);
    132 	if (nelem > SIZE_MAX/elemsize)
    133 		return NULL;
    134 	return kmalloc(nelem * elemsize, gfp);
    135 }
    136 
    137 /*
    138  * XXX kvfree must additionally work on kmalloc (linux/slab.h) and
    139  * vmalloc (linux/vmalloc.h).  If you change either of those, be sure
    140  * to change this too.
    141  */
    142 
    143 static inline void
    144 kvfree(void *ptr)
    145 {
    146 	kfree(ptr);
    147 }
    148 
    149 static inline void
    150 set_page_dirty(struct page *page)
    151 {
    152 	struct vm_page *pg = &page->p_vmp;
    153 
    154 	/* XXX */
    155 	if (pg->uobject != NULL) {
    156 		rw_enter(pg->uobject->vmobjlock, RW_WRITER);
    157 		uvm_pagemarkdirty(pg, UVM_PAGE_STATUS_DIRTY);
    158 		rw_exit(pg->uobject->vmobjlock);
    159 	} else {
    160 		uvm_pagemarkdirty(pg, UVM_PAGE_STATUS_DIRTY);
    161 	}
    162 }
    163 
    164 #endif  /* _LINUX_MM_H_ */
    165