source: trunk/kernel/mm/ppm.h @ 220

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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
35/*****************************************************************************************
36 * This structure defines the Physical Memory Manager in a cluster.
37 * In all clusters, the physical memory bank starts at local physical address 0.
38 * The size of this local physical memory is defined by the <pages_nr> field in the
39 * boot_info structure. It is split in three parts:
40 * - the "kernel_code" section contains the kernel code, loaded by the boot-loader.
41 *   It starts at PPN = 0 and the size is defined by the <pages_offset> field in the
42 *   boot_info structure.
43 * - the "pages_tbl" section contains the physical page descriptors array. It starts
44 *   at PPN = pages_offset, and it contains one entry per small physical page in cluster.
45 *   It is created and initialized by the hal_ppm_create() function. "the
46 * - The "kernel_heap" section contains all physical pages that are are not in the
47 *   in the kernel_code and pages_tbl sections, and that have not been reserved by the
48 *   architecture specific bootloader. The reserved pages are defined in the boot_info
49 *   structure.
50 *
51 * The main service provided by the PMM is the dynamic allocation of physical pages
52 * from the "kernel_heap" section.
53 * This low-level allocator implements the buddy algorithm: an allocated block is
54 * an integer number n of 4 Kbytes pages, and n (called order) is a power of 2.
55 ****************************************************************************************/
56
57typedef struct ppm_s
58{
59        spinlock_t     free_lock;               /*! lock protecting free_pages[] lists      */
60        list_entry_t   free_pages_root[CONFIG_PPM_MAX_ORDER];  /*! roots of free lists      */
61        uint32_t       free_pages_nr[CONFIG_PPM_MAX_ORDER];    /*! numbers of free pages    */
62        page_t       * pages_tbl;               /*! pointer on page descriptors array       */
63        uint32_t       pages_nr;                /*! total number of small physical page     */
64    spinlock_t     dirty_lock;              /*! lock protecting the dirty pages list    */
65    list_entry_t   dirty_root;              /*! root of dirty pages list                */
66    void         * vaddr_base;              /*! pointer on local physical memory base   */
67}
68ppm_t;
69
70/*****************************************************************************************
71 * This is the low-level physical pages allocation function.
72 * It allocates N contiguous physical pages. N is a power of 2.
73 * In normal use, you don't need to call it directly, as the recommended way to get
74 * physical pages is to call the generic allocator defined in kmem.h.
75 *****************************************************************************************
76 * @ order        : ln2( number of 4 Kbytes pages)
77 * @ returns a pointer on the page descriptor if success / NULL otherwise
78 **************************************************************************************à))**/
79page_t * ppm_alloc_pages( uint32_t order );
80
81/*****************************************************************************************
82 * This is the low-level physical pages release function. It takes the lock protecting
83 * the free_list before register the released page in the relevant free_list.
84 * In normal use, you do not need to call it directly, as the recommended way to free
85 * physical pages is to call the generic allocator defined in kmem.h.
86 *****************************************************************************************
87 * @ page         : pointer to the page descriptor to be released
88 ****************************************************************************************/
89void ppm_free_pages( page_t * page );
90
91/*****************************************************************************************
92 * This function does the same as the ppm_free_page() function, without taking the lock.
93 * It is used by the hal_ppm_init() function to initialize the pages_tbl[] array, when
94 * there is no concurrent access issue.
95 *****************************************************************************************
96 * @ page         : pointer to the page descriptor to be released
97 ****************************************************************************************/
98void ppm_free_pages_nolock( page_t * page );
99
100/*****************************************************************************************
101 * This function check if a page descriptor pointer is valid.
102 *****************************************************************************************
103 * @ page         : pointer on a page descriptor
104 * @ returns true if valid / false otherwise.
105 ****************************************************************************************/
106inline bool_t ppm_page_is_valid( page_t * page );
107
108/*****************************************************************************************
109 * Get the page virtual address from the page descriptor pointer.
110 *****************************************************************************************
111 * @ page         : pointer to page descriptor
112 * @ returns virtual address of page itself.
113 ****************************************************************************************/
114inline void* ppm_page2vaddr( page_t * page );
115
116/*****************************************************************************************
117 * Get the page descriptor pointer from the page virtual address.
118 *****************************************************************************************
119 * @ vaddr        : page virtual address
120 * @ returns pointer on page descriptor
121 ****************************************************************************************/
122inline page_t * ppm_vaddr2page( void * vaddr );
123
124/*****************************************************************************************
125 * Get the PPN from the page descriptor pointer.
126 *****************************************************************************************
127 * @ page         : pointer to page descriptor
128 * @ returns physical page number
129 ****************************************************************************************/
130inline ppn_t ppm_page2ppn( page_t * page );
131
132/*****************************************************************************************
133 * Get the page descriptor pointer from the PPN.
134 *****************************************************************************************
135 * @ ppn          : physical page number
136 * @ returns pointer on page descriptor
137 ****************************************************************************************/
138inline page_t * ppm_ppn2page( ppn_t ppn );
139
140/*****************************************************************************************
141 * Get the page virtual address from the PPN.
142 *****************************************************************************************
143 * @ ppn          : physical page number
144 * @ returns page virtual address.
145 ****************************************************************************************/
146inline void* ppm_ppn2vaddr( ppn_t ppn );
147
148/*****************************************************************************************
149 * Get the PPN from the page virtual address.
150 *****************************************************************************************
151 * @ vaddr        : page virtual address
152 * @ returns physical page number.
153 ****************************************************************************************/
154inline ppn_t ppm_vaddr2ppn( void * base );
155
156/*****************************************************************************************
157 * This function prints the PPM allocator status.
158 *****************************************************************************************
159 * @ ppm      : pointer on PPM allocator.
160 * @ string   : define context of display.
161 ****************************************************************************************/
162void ppm_print( ppm_t * ppm,
163                char  * string );
164
165/*****************************************************************************************
166 * This function checks PPM allocator consistency.
167 *****************************************************************************************
168 * @ ppm      : pointer on PPM allocator.
169 * @ return 0 if PPM is OK / return -1 if PPM not consistent.
170 ****************************************************************************************/
171error_t ppm_assert_order( ppm_t * ppm );
172
173#endif  /* _PPM_H_ */
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