[54] | 1 | /* |
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[110] | 2 | * hal_ppm.c - Generic Physical Page Manager API implementation for x86 |
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[54] | 3 | * |
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[110] | 4 | * Copyright (c) 2017 Maxime Villard |
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[54] | 5 | * |
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| 6 | * This file is part of ALMOS-MKH. |
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| 7 | * |
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| 8 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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| 9 | * under the terms of the GNU General Public License as published by |
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| 10 | * the Free Software Foundation; version 2.0 of the License. |
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| 11 | * |
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| 12 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 13 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU General Public License |
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[234] | 18 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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[54] | 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |
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| 22 | #include <kernel_config.h> |
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| 23 | #include <hal_types.h> |
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| 24 | #include <hal_ppm.h> |
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| 25 | #include <hal_special.h> |
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| 26 | #include <printk.h> |
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| 27 | #include <spinlock.h> |
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| 28 | #include <process.h> |
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| 29 | #include <ppm.h> |
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| 30 | #include <thread.h> |
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| 31 | #include <cluster.h> |
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| 32 | #include <page.h> |
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| 33 | |
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[116] | 34 | #include <hal_boot.h> |
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[54] | 35 | #include <hal_internal.h> |
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| 36 | |
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[110] | 37 | error_t hal_ppm_init(boot_info_t *info) |
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[54] | 38 | { |
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[116] | 39 | boot_rsvd_t *rsvd; |
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| 40 | size_t i, j; |
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[110] | 41 | |
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| 42 | // get relevant info from boot_info structure |
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| 43 | uint32_t pages_nr = info->pages_nr; |
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| 44 | uint32_t pages_tbl_offset = info->pages_offset; |
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| 45 | uint32_t rsvd_nr = info->rsvd_nr; |
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| 46 | |
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| 47 | // get pointer on local Physical Page Manager |
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| 48 | ppm_t * ppm = &LOCAL_CLUSTER->ppm; |
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| 49 | |
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| 50 | // initialize lock protecting the free_pages[] lists |
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| 51 | spinlock_init( &ppm->free_lock ); |
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| 52 | |
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| 53 | // initialize lock protecting the dirty_pages list |
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| 54 | spinlock_init( &ppm->dirty_lock ); |
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| 55 | |
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| 56 | // initialize all free_pages[] lists as empty |
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| 57 | for( i = 0 ; i < CONFIG_PPM_MAX_ORDER ; i++ ) |
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| 58 | { |
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| 59 | list_root_init( &ppm->free_pages_root[i] ); |
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| 60 | ppm->free_pages_nr[i] = 0; |
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| 61 | } |
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| 62 | |
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[116] | 63 | // initialize dirty_list as empty |
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| 64 | list_root_init( &ppm->dirty_root ); |
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[110] | 65 | |
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[116] | 66 | // compute size of pages_tbl[] array rounded to an integer number of pages |
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| 67 | uint32_t bytes = ARROUND_UP( pages_nr * sizeof(page_t), CONFIG_PPM_PAGE_SIZE ); |
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| 68 | |
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| 69 | // compute number of pages required to store page descriptor array |
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| 70 | uint32_t pages_tbl_nr = bytes >> CONFIG_PPM_PAGE_SHIFT; |
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| 71 | |
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| 72 | // compute total number of reserved pages (kernel code & pages_tbl[]) |
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| 73 | uint32_t reserved_pages = pages_tbl_offset + pages_tbl_nr; |
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| 74 | |
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| 75 | // initialize pages_nr, pages_tbl, and vaddr_base pointers |
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| 76 | ppm->pages_nr = pages_nr; |
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| 77 | ppm->vaddr_base = (void *)CLUSTER_MIN_VA(0); |
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| 78 | ppm->pages_tbl = (page_t *)hal_gpt_bootstrap_valloc(pages_tbl_nr); |
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| 79 | |
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| 80 | // make sure we respect the rule [VA = PA + constant_offset] |
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| 81 | XASSERT(ppm->pages_tbl == ppm->vaddr_base + pages_tbl_offset * PAGE_SIZE); |
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| 82 | |
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| 83 | // initialize all page descriptors in pages_tbl[] |
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| 84 | for( i = 0 ; i < pages_nr ; i++ ) |
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| 85 | { |
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| 86 | page_init( &ppm->pages_tbl[i] ); |
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| 87 | |
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| 88 | // TODO optimisation for this enormous loop on small pages: |
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| 89 | // make only a partial init with a memset, and complete the |
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| 90 | // initialisation when page is allocated [AG] |
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| 91 | } |
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| 92 | |
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| 93 | /* |
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| 94 | * Set the PG_RESERVED flag for reserved pages (kernel, pages_tbl[] and |
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| 95 | * memory holes). |
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| 96 | */ |
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| 97 | for (i = 0; i < reserved_pages; i++) { |
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| 98 | page_set_flag(&ppm->pages_tbl[i], PG_RESERVED); |
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| 99 | } |
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| 100 | for (i = 0; i < rsvd_nr; i++) { |
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| 101 | rsvd = &info->rsvd[i]; |
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| 102 | for (j = 0; j < rsvd->npages; j++) { |
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| 103 | page_set_flag(&ppm->pages_tbl[rsvd->first_page + j], PG_RESERVED); |
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| 104 | } |
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| 105 | } |
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| 106 | |
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| 107 | /* Release all other pages to populate the free lists */ |
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| 108 | for (i = reserved_pages; i < pages_nr; i++) { |
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| 109 | if (!page_is_flag(&ppm->pages_tbl[i], PG_RESERVED)) |
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| 110 | ppm_free_pages_nolock(&ppm->pages_tbl[i]); |
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| 111 | } |
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| 112 | |
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| 113 | /* Check consistency */ |
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| 114 | return ppm_assert_order(ppm); |
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[54] | 115 | } |
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| 116 | |
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