source: trunk/hal/tsar_mips32/core/hal_ppm.c @ 290

Last change on this file since 290 was 279, checked in by alain, 7 years ago

1) Introduce independant command fields for the various devices in the thread descriptor.
2) Introduce a new dev_pic_enable_ipi() function in the generic PIC device
3) Fix two bugs identified by Maxime in the scheduler initialisation, and in the sched_select().
4) fix several bugs in the TSAR hal_kentry.S.
5) Introduce a third kgiet segment (besides kdata and kcode) in the TSAR bootloader.

File size: 3.9 KB
Line 
1/*
2 * hal_ppm.c - Generic Physical Page Manager API implementation for TSAR
3 *
4 * Authors  Alain Greiner (2016,2017)
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#include <kernel_config.h>
25#include <hal_types.h>
26#include <hal_ppm.h>
27#include <hal_special.h>
28#include <printk.h>
29#include <spinlock.h>
30#include <process.h>
31#include <ppm.h>
32#include <thread.h>
33#include <cluster.h>
34#include <page.h>
35
36//////////////////////////////////////////////////////////////////////////////////////////
37// For The TSAR architecture, the kernel pointers are identity mapped:
38// - the 32 bits PTR value is identical to the 32 bits LPA value,
39// - the 64 bits XPTR value is identical to the 64 bits PADDR value.
40// The pages_tbl[] is mapped in first free page after kernel code.
41//////////////////////////////////////////////////////////////////////////////////////////
42
43///////////////////////////////////////////
44error_t  hal_ppm_init( boot_info_t * info )
45{
46        uint32_t i;
47
48        // get relevant info from boot_info structure
49        uint32_t pages_nr         = info->pages_nr;
50        uint32_t pages_tbl_offset = info->pages_offset;
51        uint32_t rsvd_nr          = info->rsvd_nr;
52
53        // get pointer on local Physical Page Manager
54        ppm_t * ppm = &LOCAL_CLUSTER->ppm;
55
56        // initialize lock protecting the free_pages[] lists
57        spinlock_init( &ppm->free_lock );
58
59        // initialize lock protecting the dirty_pages list
60        spinlock_init( &ppm->dirty_lock );
61
62        // initialize all free_pages[] lists as empty
63        for( i = 0 ; i < CONFIG_PPM_MAX_ORDER ; i++ )
64        {
65                list_root_init( &ppm->free_pages_root[i] );
66                ppm->free_pages_nr[i] = 0;
67        }
68
69        // initialize dirty_list as empty
70        list_root_init( &ppm->dirty_root );
71
72        // compute size of pages_tbl[] array rounded to an integer number of pages
73        uint32_t bytes = ARROUND_UP( pages_nr * sizeof(page_t), CONFIG_PPM_PAGE_SIZE );
74
75        // compute number of pages required to store page descriptor array
76        uint32_t pages_tbl_nr = bytes >> CONFIG_PPM_PAGE_SHIFT;
77
78        // compute total number of reserved pages (kernel code & pages_tbl[])
79        uint32_t reserved_pages = pages_tbl_offset + pages_tbl_nr;
80
81        // initialize pages_nr, pages_tbl, and vaddr_base pointers
82        // (TSAR uses identity mapping for kernel pointers)
83        // x86 architectures should use vaddr_base = 0xFFFF8000000000 + (cxy << 36)
84        ppm->pages_nr   = pages_nr;
85        ppm->vaddr_base = NULL;
86        ppm->pages_tbl  = (page_t*)( ppm->vaddr_base +
87                                     (pages_tbl_offset << CONFIG_PPM_PAGE_SHIFT) );
88
89        // initialize all page descriptors in pages_tbl[]
90        for( i = 0 ; i < pages_nr ; i++ )
91        {
92                page_init( &ppm->pages_tbl[i] );
93
94                // TODO optimisation for this enormous loop on small pages:
95                // make only a partial init with a memset, and complete the
96                // initialisation when page is allocated [AG]
97        }
98
99        // - set PG_RESERVED flag for reserved pages (kernel code & pages_tbl[])
100        // - release all other pages to populate the free lists
101        for( i = 0 ; i < reserved_pages ; i++)
102        {
103                page_set_flag( &ppm->pages_tbl[i] , PG_RESERVED );
104        }
105        for( i = reserved_pages ; i < pages_nr ; i++ )
106        {
107                ppm_free_pages_nolock( &ppm->pages_tbl[i] );
108
109                // TODO optimisation : decompose this enormous set of small pages
110                // to several sets of big pages with various order values
111        }
112
113        // check consistency
114        return ppm_assert_order( ppm );
115}
116
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