source: trunk/libs/libalmosmkh/almosmkh.h @ 478

Last change on this file since 478 was 478, checked in by viala@…, 3 years ago

[libalmosmkh] Add void type to function prototypes with no parameter

File size: 19.6 KB
Line 
1/*
2 * almosmkh.h - User level ALMOS-MKH specific library definition.
3 *
4 * Author     Alain Greiner (2016,2017,2018)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#ifndef _LIBALMOSMKH_H_
25#define _LIBALMOSMKH_H_
26
27/***************************************************************************************
28 * This file defines an user level, ALMOS-MKH specific library, containing:
29 * - non standard system calls.
30 * - debug functions.
31 * - remote malloc extensions.
32 **************************************************************************************/
33
34#include <pthread.h>
35#include <shared_almos.h>
36
37/****************** Non standard (ALMOS_MKH specific) system calls ********************/
38
39
40/***************************************************************************************
41 * This function is used to give the process identified by the <pid> argument the
42 * exclusive ownership of its TXT terminal.
43 ***************************************************************************************
44 * @ pid        : process identifier.
45 * @ returns O if success / returns -1 if process not found.
46 **************************************************************************************/
47int fg( unsigned int pid );
48
49/***************************************************************************************
50 * This function stores in the buffer identified by the <owner> argument a non zero
51 * value when the process identified by the <pid> argument is currently the exclusive
52 * owner of its TXT terminal.
53 ***************************************************************************************
54 * @ pid        : [in]  process identifier.
55 * @ owner      : [out] pointer on buffer to store the
56 * @ returns O if success / returns -1 if process not found.
57 **************************************************************************************/
58int is_fg( unsigned int pid,
59           unsigned int * owner );
60
61/***************************************************************************************
62 * This function returns the hardware platform parameters.
63 ***************************************************************************************
64 * @ x_size   : [out] number of clusters in a row.
65 * @ y_size   : [out] number of clusters in a column.
66 * @ ncores   : [out] number of cores per cluster.
67 * @ return always 0.
68 **************************************************************************************/
69int get_config( unsigned int * x_size,
70                unsigned int * y_size,
71                unsigned int * ncores );
72
73/***************************************************************************************
74 * This function returns the cluster an local index for the calling core.
75 ***************************************************************************************
76 * @ cxy      : [out] cluster identifier.
77 * @ lid      : [out] core local index in cluster.
78 * @ return always 0.
79 **************************************************************************************/
80int get_core( unsigned int * cxy,
81              unsigned int * lid );
82
83/***************************************************************************************
84 * This function returns the calling core cycles counter,
85 * taking into account a possible overflow on 32 bits architectures.
86 ***************************************************************************************
87 * @ cycle    : [out] current cycle value.
88 * @ return always 0.
89 **************************************************************************************/
90int get_cycle( unsigned long long * cycle );
91
92/***************************************************************************************
93 * This function implement the operations related to User Thread Local Storage.
94 ***************************************************************************************
95 * @ operation  : UTLS operation type as defined in "shared_sycalls.h" file.
96 * @ value      : argument value for the UTLS_SET operation.
97 * @ return value for the UTLS_GET and UTLS_GET_ERRNO / return -1 if failure.
98 **************************************************************************************/
99int utls( unsigned int operation,
100          unsigned int value );
101
102/***************************************************************************************
103 * This function returns a positive integer fom the standard "stdin" stream.
104 ***************************************************************************************
105 * returns the integer value if success / returns -1 if failure.
106 **************************************************************************************/
107int getint( void );
108
109
110/***************** Non standard (ALMOS-MKH specific) debug functions ******************/
111
112
113/***************************************************************************************
114 * This debug function displays on the kernel terminal TXT0
115 * the thread / process / core identifiers, the current cycle, plus a user defined
116 * message as specified by the <string> argument.
117 ***************************************************************************************
118 * @ string    : [in] user defined message.
119 **************************************************************************************/
120void display_string( char * string );
121
122/***************************************************************************************
123 * This debug function displays on the kernel terminal TXT0
124 * the state of the  VMM for the process <pid>, in cluster <cxy>.
125 * It can be called by any thread running in any cluster.
126 ***************************************************************************************
127 * @ pid      : [in] process identifier.
128 * @ return 0 if success / return -1 if illegal argument.
129 **************************************************************************************/
130int display_vmm(unsigned int cxy, unsigned int  pid );
131
132/***************************************************************************************
133 * This debug function displays on the kernel terminal TXT0
134 * the state of the core scheduler identified by the <cxy> and <lid> arguments.
135 * It can be called by any thread running in any cluster.
136 ***************************************************************************************
137 * @ cxy      : [in] target cluster identifier.
138 * @ lid      : [in] target core local index.
139 * @ return 0 if success / return -1 if illegal arguments.
140 **************************************************************************************/
141int display_sched( unsigned int  cxy,
142                   unsigned int  lid );
143
144/***************************************************************************************
145 * This debug function displays on the kernel terminal TXT0
146 * the list of process registered in a given cluster identified by the <cxy> argument.
147 * It can be called by any thread running in any cluster.
148 ***************************************************************************************
149 * @ cxy      : [in] target cluster identifier.
150 * @ return 0 if success / return -1 if illegal argument.
151 **************************************************************************************/
152int display_cluster_processes( unsigned int  cxy );
153
154/***************************************************************************************
155 * This debug function displays on the kernel terminal TXT0
156 * the list of processes attached to a given TXT channel.
157 * It can be called by any thread running in any cluster.
158 ***************************************************************************************
159 * @ txt_id   : [in] TXT terminal indes.
160 * @ return 0 if success / return -1 if illegal argument.
161 **************************************************************************************/
162int display_txt_processes( unsigned int txt_id );
163
164/***************************************************************************************
165 * This debug function displays on the kernel terminal TXT0
166 * the list of channel devices available in the architecture.
167 * It can be called by any thread running in any cluster.
168 ***************************************************************************************
169 * @ return always 0.
170 **************************************************************************************/
171int display_chdev( void );
172
173/***************************************************************************************
174 * This debug function displays on the kernel terminal TXT0
175 * the list of channel device or pseudo-files registered in the VFS cache.
176 * It can be called by any thread running in any cluster.
177 ***************************************************************************************
178 * @ return always 0.
179 **************************************************************************************/
180int display_vfs( void );
181
182/***************************************************************************************
183 * This debug function displays on the kernel terminal TXT0 the current DQDT state.
184 * It can be called by any thread running in any cluster.
185 ***************************************************************************************
186 * @ return always 0.
187 **************************************************************************************/
188int display_dqdt( void );
189
190/*****************************************************************************************
191* This debug function is used to activate / desactivate the context switches trace
192* for a core identified by the <cxy> and <lid> arguments.
193* It can be called by any thread running in any cluster.
194*****************************************************************************************
195* @ active     : activate trace if non zero / desactivate if zero.
196* @ cxy        : cluster identifier.
197* @ lid        : core local index.
198* @ returns O if success / returns -1 if illegal arguments.
199****************************************************************************************/
200int trace( unsigned int active,
201           unsigned int cxy, 
202           unsigned int lid );
203
204/****************************************************************************************
205 * This blocking function implements an user-level interactive debugger that can be
206 * introduced in any user application to display various kernel distributed structures.
207 * The supported commands are:
208 * - p (cxy)     : display all processes descriptors in a given cluster.
209 * - s (cxy,lid) : display all threads attached to a given core in a given cluster.
210 * - v (cxy)     : display the calling process VMM in a given cluster.
211 * - t (tid)     : display all owner process descriptors attached to a TXT terminal.
212 * - x           : force the calling process to exit.
213 * - c           : continue calling process execution.
214 * - h           : list the supported commands
215 ***************************************************************************************/
216void idbg( void );
217
218
219/****************** Non standard (ALMOS-MKH specific) malloc operations  ***************/
220
221/////////////////////////////////////////////////////////////////////////////////////////
222// General principles:
223// - In user space the HEAP zone spread between the ELF zone and the STACK zone,
224//   as defined in the kernel_config.h file.
225// - The malloc library uses the mmap() syscall to create - on demand -
226//   one vseg in a given cluster. The size of this vseg is defined below
227//   by the MALLOC_LOCAL_STORE_SIZE parameter.
228// - For a standard malloc(), the target cluster is the cluster containing
229//   the core running the client thread.
230// - For a remote_malloc(), the target cluster is explicitely defined
231//   by the argument.
232// - In each cluster, the available storage in virtual space is handled by a
233//   local allocator using the buddy algorithm.
234//
235// TODO : In this first implementation one single - fixed size - vseg
236//        is allocated on demand in each cluster.
237//        We should introduce the possibility to dynamically allocate
238//        several vsegs in each cluster, using several mmap when required.
239/////////////////////////////////////////////////////////////////////////////////////////
240// Free blocks organisation in each cluster :
241// - All free blocks have a size that is a power of 2, larger or equal
242//   to MALLOC_MIN_BLOCK_SIZE (typically 64 bytes).
243// - All free blocks are aligned.
244// - They are pre-classed in an array of linked lists, where all blocks in a
245//   given list have the same size.
246// - The NEXT pointer implementing those linked lists is written
247//   in the first bytes of the block itself, using the unsigned int type.
248// - The pointers on the first free block for each size are stored in an
249//   array of pointers free[32] in the storage(x,y) descriptor.
250/////////////////////////////////////////////////////////////////////////////////////////
251// Allocation policy:
252// - The block size required by the user can be any value, but the allocated
253//   block size can be larger than the requested size:
254// - The allocator computes actual_size, that is the smallest power of 2
255//   value larger or equal to the requested size AND larger or equal to
256//   MALLOC_MIN_BLOCK_SIZE.
257// - It pop the linked list of free blocks corresponding to actual_size,
258//   and returns the block B if the list[actual_size] is not empty.
259// - If the list[actual_size] is empty, it pop the list[actual_size * 2].
260//   If a block B' is found, it breaks this block in 2 B/2 blocks, returns
261//   the first B/2 block and push the other B/2 block into list[actual_size].
262// - If the list[actual_size * 2] is empty, it pop the list[actual_size * 4].
263//   If a block B is found, it break this block in 3 blocks B/4, B/4 and B/2,
264//   returns the first B/4 block, push the other blocks B/4 and B/2 into
265//   the proper lists. etc...
266// - If no block satisfying the request is available it returns a failure
267//   (NULL pointer).
268// - This allocation policy has the nice following property:
269//   If the vseg is aligned (the vseg base is a multiple of the
270//   vseg size), all allocated blocks are aligned on the actual_size.
271/////////////////////////////////////////////////////////////////////////////////////////
272// Free policy:
273// - Each allocated block is registered in an alloc[] array of unsigned char.
274// - This registration is required by the free() operation, because the size
275//   of the allocated block must be obtained from the base address of the block. 
276// - The number of entries in this array is equal to the max number
277//   of allocated block : MALLOC_LOCAL_STORE_SIZE / MALLOC_MIN_BLOCK_SIZE.
278// - For each allocated block, the value registered in the alloc[] array
279//   is log2( size_of_allocated_block ).
280// - The index in this array is computed from the allocated block base address:
281//      index = (block_base - vseg_base) / MALLOC_MIN_BLOCK_SIZE
282// - The alloc[] array is stored at the end of heap segment. This consume
283//   (1 / MALLOC_MIN_BLOCK_SIZE) of the total storage capacity.
284/////////////////////////////////////////////////////////////////////////////////////////
285
286
287#define MALLOC_INITIALIZED         0xBABEF00D   // magic number when initialised
288#define MALLOC_MIN_BLOCK_SIZE      0x40         // 64 bytes
289#define MALLOC_LOCAL_STORE_SIZE    0x800000     // 8 Mbytes     
290#define MALLOC_MAX_CLUSTERS        0x100        // 256 clusters
291
292/////////////////////////////////////////////////////////////////////////////////////////
293//               store(x,y) descriptor (one per cluster)
294/////////////////////////////////////////////////////////////////////////////////////////
295
296typedef struct malloc_store_s
297{
298    pthread_mutex_t mutex;           // lock protecting exclusive access to local heap
299    unsigned int    initialized;     // initialised when value == MALLOC_INITIALIZED
300    unsigned int    cxy;             // cluster identifier 
301    unsigned int    store_base;      // store base address
302    unsigned int    store_size;      // store size (bytes)
303    unsigned int    alloc_base;      // alloc[] array base address
304    unsigned int    alloc_size;      // alloc[] array size (bytes)
305    unsigned int    free[32];        // array of addresses of first free block
306} 
307malloc_store_t;
308
309/*****************************************************************************************
310 * This function allocates <size> bytes of memory in user space, and returns a pointer
311 * to the allocated buffer. The pysical memory is allocated from store located in
312 * cluster identified by the <cxy> argument.
313 *****************************************************************************************
314 * @ size    : number of requested bytes.
315 * @ cxy     : target cluster identifier.
316 * @ returns a pointer on the allocated buffer if success / returns NULL if failure
317 ****************************************************************************************/
318void * remote_malloc( unsigned int size, 
319                      unsigned int cxy );
320
321/*****************************************************************************************
322 * This function releases the memory buffer identified by the <ptr> argument,
323 * to the store identified by the <cxy> argument.
324 * It displays an error message, but does nothing if the ptr is illegal.
325 *****************************************************************************************
326 * @ ptr   : pointer on the released buffer.
327 * @ cxy   : target cluster identifier.
328 ****************************************************************************************/
329void remote_free( void        * ptr,
330                  unsigned int  cxy );
331
332/*****************************************************************************************
333 * This function releases the memory buffer identified by the <ptr> argument,
334 * to the store located in cluster identified by the <cxy> argument, and allocates
335 * a new buffer containing <size> bytes from this store.
336 * The content of the old buffer is copied to the new buffer, up to <size> bytes.
337 * It displays an error message, but does nothing if the ptr is illegal.
338 *****************************************************************************************
339 * @ ptr     : pointer on the released buffer.
340 * @ size    : new buffer requested size (bytes).
341 * @ cxy     : target cluster identifier.
342 * @ return a pointer on allocated buffer if success / return NULL if failure
343 ****************************************************************************************/
344void * remote_realloc( void        * ptr,
345                       unsigned int  size,
346                       unsigned int  cxy );
347
348/*****************************************************************************************
349 * This function allocates enough space for <count> objects that are <size> bytes
350 * of memory each from the store located in cluster identied by the <cxy> argument.
351 * The allocated memory is filled with bytes of value zero.
352 *****************************************************************************************
353 * @ count   : number of requested objects.
354 * @ size    : number of bytes per object.
355 * @ cxy     : target cluster identifier.
356 * @ returns a pointer on allocated buffer if success / returns NULL if failure
357 ****************************************************************************************/
358void * remote_calloc( unsigned int count,
359                      unsigned int size,
360                      unsigned int cxy );
361
362#endif /* _LIBALMOSMKH_H_ */
363
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