source: trunk/kernel/kern/core.c @ 228

Last change on this file since 228 was 188, checked in by alain, 7 years ago

Redefine the PIC device API.

File size: 5.1 KB
Line 
1/*
2 * core.c - core descriptor access function.
3 *
4 * Author  Ghassan Almaless (2008,2009,2010,2011,2012)
5 *         Alain Greiner (2016,2017)
6 *
7 * Copyright (c) UPMC Sorbonne Universites
8 *
9 * This file is part of ALMOS-MKH.
10 *
11 * ALMOS-MKH.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-MKH 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-MKH; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25#include <kernel_config.h>
26#include <hal_types.h>
27#include <hal_special.h>
28#include <errno.h>
29#include <printk.h>
30#include <thread.h>
31#include <chdev.h>
32#include <dev_pic.h>
33#include <rpc.h>
34#include <cluster.h>
35#include <kmem.h>
36#include <dqdt.h>
37#include <core.h>
38
39/////////////////////////////////
40void core_init( core_t    * core,
41                lid_t       lid,
42                gid_t       gid )
43{
44        core->lid               = lid;
45        core->gid               = gid;
46        core->cycles            = 0;
47        core->time_stamp        = 0;
48        core->ticks_nr          = 0;
49        core->ticks_period      = CONFIG_SCHED_TICK_PERIOD;
50        core->usage             = 0;
51        core->spurious_irqs     = 0;
52    core->rpc_threads       = 0;
53        core->thread_idle       = NULL;
54        core->fpu_owner         = NULL;
55        core->rand_last         = hal_time_stamp() & 0xFFF;
56
57    // initialize scheduler
58        sched_init( core );
59}
60
61//////////////////////////////////////////////
62inline uint32_t core_get_rand( core_t * core )
63{
64        uint32_t value  = ((core->rand_last * CONFIG_RDNG_PARAM_A) +
65                            CONFIG_RDNG_PARAM_C) ^ (hal_get_cycles() & 0xFFF);
66        core->rand_last = value;
67        return value;
68}
69
70////////////////////////////////////
71void core_get_time( core_t   * core,
72                    uint32_t * tm_s, 
73                    uint32_t * tm_us )
74{
75        uint64_t cycles = hal_get_cycles();
76
77        *tm_s  = (cycles / CONFIG_CYCLES_PER_MS);
78        *tm_us = (cycles % CONFIG_CYCLES_PER_MS) / (CONFIG_CYCLES_PER_MS / 1000000);
79}
80
81//////////////////////////////////////
82void core_time_update( core_t * core )
83{
84        uint32_t elapsed;
85        uint32_t ticks_nr   = core->ticks_nr;
86        uint64_t cycles     = core->cycles;
87        uint32_t time_stamp = core->time_stamp;
88        uint32_t time_now   = hal_get_cycles();
89
90        // compute number of elapsed cycles taking into account 32 bits register wrap
91        if( time_now < time_stamp ) elapsed = (0xFFFFFFFF - time_stamp) + time_now;
92        else                        elapsed = time_now - time_stamp;
93
94        cycles  += elapsed;
95        ticks_nr = elapsed / core->ticks_period;
96
97        core->time_stamp     = time_now;
98        core->cycles         = cycles + elapsed;
99        core->ticks_nr       = ticks_nr + (elapsed / core->ticks_period);
100        hal_fence();
101}
102
103////////////////////////////////
104void core_clock( core_t * core )
105{
106        uint32_t ticks;
107
108        // update cycles and ticks counter
109        core_time_update( core );
110
111        // get current ticks number
112        ticks = core->ticks_nr;
113
114        // handle pending alarms TODO ??? [AG]
115        // alarm_clock( &core->alarm_mgr , ticks );
116
117        // handle scheduler TODO  improve the scheduling condition ... AG
118        if( (ticks % 10) == 0 ) sched_yield();
119
120        // update DQDT TODO  This update should depend on the cluster identifier,
121        // to avoid simultaneous updates from various clusters ... AG
122        if( ((ticks % CONFIG_DQDT_PERIOD) == 0) && (core->lid == 0) ) dqdt_global_update();
123}
124
125////////////////////////////////////////
126void core_compute_stats( core_t * core )
127{
128        thread_t * idle  = core->thread_idle;
129        uint32_t   ticks = core->ticks_nr;
130
131        uint32_t   idle_percent;
132        uint32_t   busy_percent;
133        uint32_t   usage;
134
135        // compute cumulated usage
136        ticks         = (ticks) ? ticks : 1;
137        idle_percent  = (idle->ticks_nr * 100) / ticks;
138        idle_percent  = (idle_percent > 100) ? 100 : idle_percent;
139        busy_percent  = 100 - idle_percent;
140        usage         = (busy_percent + core->usage) / 2;
141
142        // update core descriptor
143        core->usage = usage;
144        hal_fence();
145
146#if CONFIG_SHOW_CPU_USAGE
147        printk(INFO, "INFO: core %d in cluster %x : busy_percent = %d / cumulated_usage = %d\n",
148               core->lid, local_cxy , busy_percent , usage );
149#endif
150
151        core->ticks_nr = 0;
152        idle->ticks_nr = 0;
153}
154
155/////////////////////////////////////
156void core_reset_stats( core_t * core )
157{
158        core_time_update(core);
159
160        core->ticks_nr              = 0;
161        core->usage                 = 0;
162        core->thread_idle->ticks_nr = 0;
163        hal_fence();
164}
165
166
167/* deprecated [AG] july 20017
168///////////////////////////////////////////////////
169void core_set_irq_vector_entry( core_t   * core,
170                                uint32_t   irq_type,
171                                uint32_t   irq_id,
172                                chdev_t  * chdev )
173{
174        if     ( irq_type == WTI_TYPE ) core->wti_vector[irq_id] = chdev;
175        else if( irq_type == HWI_TYPE ) core->hwi_vector[irq_id] = chdev;
176        else                            core->pti_vector[irq_id] = chdev;
177}
178*/
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