source: trunk/kernel/mm/ppm.h @ 42

Last change on this file since 42 was 18, checked in by max@…, 7 years ago

cosmetic, and a few typos
File size: 8.8 KB
Line 
1/*
2 * ppm.h - Per-cluster Physical Pages Manager Interface
3 *
4 * Authors  Ghassan Almaless (2008,2009,2010,2011,2012)
5 *          Alain Greiner    (2016)
6 *
7 * Copyright (c) UPMC Sorbonne Universites
8 *
9 * This file is part of ALMOS-MKH.
10 *
11 * ALMOS-kernel is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; version 2.0 of the License.
14 *
15 * ALMOS-kernel is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with ALMOS-kernel; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25#ifndef _PPM_H_
26#define _PPM_H_
27
28#include <hal_types.h>
29#include <list.h>
30#include <spinlock.h>
31#include <boot_info.h>
32#include <page.h>
33
34#define  PPM_SIGNATURE     0xBABEF00D
35
36/*****************************************************************************************
37 * This structure defines the Physical Memory Manager in a cluster.
38 * In all clusters, the physical memory bank starts at address 0.
39 * The segments kcode and kdata are mapped in the first "offset" pages.
40 * The physical page descriptors array is implemented just after this offset zone.
41 * The main service provided by the PMM is the dynamic allocation of physical pages.
42 * This low-level allocator implements the buddy algorithm: an allocated block is
43 * is an integer number n of 4 Kbytes pages, and n (called order) is a power of 2.
44 ****************************************************************************************/
45typedef struct ppm_s
46{
47        uint32_t       signature;               /*! set when initialised                    */
48        spinlock_t     free_lock;               /*! lock protecting free_pages[] array      */
49        list_entry_t   free_pages_root[CONFIG_PPM_MAX_ORDER];  /*! roots of free lists      */
50        uint32_t       free_pages_nr[CONFIG_PPM_MAX_ORDER];    /*! numbers of free pages    */
51    uint32_t       total_free_pages;        /*! total number of free pages              */
52        page_t       * pages_tbl;               /*! pointer on page descriptors array       */
53        uint32_t       pages_nr;                /*! total number of 4 Kbytes physical page  */
54    uint32_t       pages_offset;            /*! allocated pages for kcode & kdata       */
55    uint32_t       pages_desc;              /*! allocated pages for pages_tbl[] array   */
56    spinlock_t     dirty_lock;              /*! lock protecting the dirty list          */
57    list_entry_t   dirty_root;              /*! root of dirty pages list                */
58}
59ppm_t;
60
61/*****************************************************************************************
62 * This function initializes a PPM (Physical Pages Manager) in a cluster.
63 * The physical memory base address in all clusters is zero.
64 * The physical memory size is NOT constrained to be smaller than 4 Gbytes.
65 *****************************************************************************************
66 * @ ppm          : pointer on physical pages manager.
67 * @ pages_nr     : total physical memory size (number of 4 Kbytes pages).
68 * @ pages_offset : number of pages already allocated in this physical memory.
69 ****************************************************************************************/
70void ppm_init( ppm_t    * ppm,
71               uint32_t   pages_nr,
72                   uint32_t   pages_offset );
73
74/*****************************************************************************************
75 * This is the low-level physical pages allocation function.
76 * It allocates N contiguous physical pages. N is a power of 2.
77 * In normal use, you don't need to call it directly, as the recommended way to get
78 * physical pages is to call the generic allocator defined in kmem.h.
79 *****************************************************************************************
80 * @ order        : ln2( number of 4 Kbytes pages)
81 * @ returns a pointer on the page descriptor if success / NULL otherwise
82 ****************************************************************************************/
83page_t * ppm_alloc_pages( uint32_t order );
84
85/*****************************************************************************************
86 * This is the low-level physical pages release function.
87 * In normal use, you do not need to call it directly, as the recommended way to free
88 * physical pages is to call the generic allocator defined in kmem.h.
89 *****************************************************************************************
90 * @ page         : pointer to the page descriptor to be released
91 ****************************************************************************************/
92void ppm_free_pages( page_t * page );
93
94/*****************************************************************************************
95 * This function check if a page descriptor is valid.
96 *****************************************************************************************
97 * @ page         : pointer on a page descriptor
98 * @ returns true if valid / false otherwise.
99 ****************************************************************************************/
100inline bool_t ppm_page_is_valid( page_t * page );
101
102/*****************************************************************************************
103 * Get the page base address from the page descriptor pointer.
104 *****************************************************************************************
105 * @ page         : pointer to page descriptor
106 * @ returns page base address
107 ****************************************************************************************/
108inline void* ppm_page2base( page_t * page );
109
110/*****************************************************************************************
111 * Get the page descriptor pointer from the page base address.
112 *****************************************************************************************
113 * @ vaddr        : page base address
114 * @ returns pointer on page descriptor
115 ****************************************************************************************/
116inline page_t * ppm_base2page( void * vaddr );
117
118/*****************************************************************************************
119 * Get the PPN from the page descriptor pointer.
120 *****************************************************************************************
121 * @ page         : pointer to page descriptor
122 * @ returns physical page number
123 ****************************************************************************************/
124inline ppn_t ppm_page2ppn( page_t * page );
125
126/*****************************************************************************************
127 * Get the page descriptor pointer from the PPN.
128 *****************************************************************************************
129 * @ ppn          : physical page number
130 * @ returns pointer on page descriptor
131 ****************************************************************************************/
132inline page_t * ppm_ppn2page( ppn_t ppn );
133
134/*****************************************************************************************
135 * Get the page base address from the PPN.
136 *****************************************************************************************
137 * @ ppn          : physical page number
138 * @ returns page base address
139 ****************************************************************************************/
140inline void* ppm_ppn2base( ppn_t ppn );
141
142/*****************************************************************************************
143 * Get the PPN from the page base address.
144 *****************************************************************************************
145 * @ vaddr        : page base address
146 * @ returns physical page number
147 ****************************************************************************************/
148inline ppn_t ppm_base2ppn( void * base );
149
150/*****************************************************************************************
151 * This function prints the PPM allocator status.
152 *****************************************************************************************
153 * @ ppm      : pointer on PPM allocator.
154 * @ string   : define context of display.
155 ****************************************************************************************/
156void ppm_print( ppm_t * ppm,
157                char  * string );
158
159/*****************************************************************************************
160 * This function checks PPM allocator consistency.
161 *****************************************************************************************
162 * @ ppm      : pointer on PPM allocator.
163 ****************************************************************************************/
164void ppm_assert_order( ppm_t * ppm );
165
166#endif  /* _PPM_H_ */
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