source: trunk/kernel/kern/core.c @ 457

Last change on this file since 457 was 457, checked in by alain, 3 years ago

This version modifies the exec syscall and fixes a large number of small bugs.
The version number has been updated (0.1)

File size: 3.2 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_kernel_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->usage             = 0;
50        core->spurious_irqs     = 0;
51        core->fpu_owner         = NULL;
52        core->rand_last         = hal_time_stamp() & 0xFFF;
53
54    // initialize scheduler
55        sched_init( core );
56}
57
58//////////////////////////////////////////////
59inline uint32_t core_get_rand( core_t * core )
60{
61        uint32_t value  = ((core->rand_last * CONFIG_RDNG_PARAM_A) +
62                            CONFIG_RDNG_PARAM_C) ^ (hal_get_cycles() & 0xFFF);
63        core->rand_last = value;
64        return value;
65}
66
67////////////////////////////////////
68void core_get_time( core_t   * core,
69                    uint32_t * tm_s, 
70                    uint32_t * tm_us )
71{
72        *tm_s  = (core->ticks_nr*CONFIG_SCHED_TICK_MS_PERIOD)/1000;
73        *tm_us = (core->ticks_nr*CONFIG_SCHED_TICK_MS_PERIOD*1000)%1000000;
74}
75
76////////////////////////////////
77void core_clock( core_t * core )
78{
79        uint32_t ticks;
80
81        // update ticks counter
82        ticks = core->ticks_nr++;
83
84        // handle scheduler
85        if( (ticks % CONFIG_SCHED_TICKS_PER_QUANTUM) == 0 ) sched_yield( "TICK");
86}
87
88////////////////////////////////////////
89void core_compute_stats( core_t * core )
90{
91        thread_t * idle  = core->scheduler.idle;
92        uint32_t   ticks = core->ticks_nr;
93
94        uint32_t   idle_percent;
95        uint32_t   busy_percent;
96        uint32_t   usage;
97
98        // compute cumulated usage
99        ticks         = (ticks) ? ticks : 1;
100        idle_percent  = (idle->ticks_nr * 100) / ticks;
101        idle_percent  = (idle_percent > 100) ? 100 : idle_percent;
102        busy_percent  = 100 - idle_percent;
103        usage         = (busy_percent + core->usage) / 2;
104
105        // update core descriptor
106        core->usage = usage;
107        hal_fence();
108
109        core->ticks_nr = 0;
110        idle->ticks_nr = 0;
111}
112
113/////////////////////////////////////
114void core_reset_stats( core_t * core )
115{
116        thread_t * idle  = core->scheduler.idle;
117
118        core->ticks_nr = 0;
119        core->usage    = 0;
120        idle->ticks_nr = 0;
121
122        hal_fence();
123}
124
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