[1] | 1 | /* |
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| 2 | * hal_gpt.c - implementation of the Generic Page Table API for TSAR-MIPS32 |
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| 3 | * |
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| 4 | * Author Alain Greiner (2016) |
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| 5 | * |
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| 6 | * Copyright (c) UPMC Sorbonne Universites |
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| 7 | * |
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| 8 | * This file is part of ALMOS-MKH. |
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| 9 | * |
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| 10 | * ALMOS-MKH.is free software; you can redistribute it and/or modify it |
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| 11 | * under the terms of the GNU General Public License as published by |
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| 12 | * the Free Software Foundation; version 2.0 of the License. |
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| 13 | * |
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| 14 | * ALMOS-MKH.is distributed in the hope that it will be useful, but |
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| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 17 | * General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with ALMOS-MKH.; if not, write to the Free Software Foundation, |
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| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 22 | */ |
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| 23 | |
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| 24 | #include <hal_types.h> |
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| 25 | #include <hal_gpt.h> |
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| 26 | #include <hal_special.h> |
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| 27 | #include <printk.h> |
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| 28 | #include <bits.h> |
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| 29 | #include <process.h> |
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| 30 | #include <kmem.h> |
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| 31 | #include <thread.h> |
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| 32 | #include <cluster.h> |
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| 33 | #include <ppm.h> |
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| 34 | #include <page.h> |
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| 35 | |
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| 36 | //////////////////////////////////////////////////////////////////////////////////////// |
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[401] | 37 | // This define the masks for the TSAR MMU PTE attributes (from TSAR MMU specification) |
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[1] | 38 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 39 | |
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[401] | 40 | #define TSAR_MMU_MAPPED 0x80000000 |
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| 41 | #define TSAR_MMU_SMALL 0x40000000 |
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[1] | 42 | #define TSAR_MMU_LOCAL 0x20000000 |
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| 43 | #define TSAR_MMU_REMOTE 0x10000000 |
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| 44 | #define TSAR_MMU_CACHABLE 0x08000000 |
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| 45 | #define TSAR_MMU_WRITABLE 0x04000000 |
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| 46 | #define TSAR_MMU_EXECUTABLE 0x02000000 |
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| 47 | #define TSAR_MMU_USER 0x01000000 |
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| 48 | #define TSAR_MMU_GLOBAL 0x00800000 |
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| 49 | #define TSAR_MMU_DIRTY 0x00400000 |
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| 50 | |
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[401] | 51 | #define TSAR_MMU_COW 0x00000001 // only for small pages |
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| 52 | #define TSAR_MMU_SWAP 0x00000004 // only for small pages |
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| 53 | #define TSAR_MMU_LOCKED 0x00000008 // only for small pages |
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[1] | 54 | |
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| 55 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 56 | // TSAR MMU related macros (from the TSAR MMU specification) |
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| 57 | // - IX1 on 11 bits |
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| 58 | // - IX2 on 9 bits |
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| 59 | // - PPN on 28 bits |
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| 60 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 61 | |
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| 62 | #define TSAR_MMU_IX1_WIDTH 11 |
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| 63 | #define TSAR_MMU_IX2_WIDTH 9 |
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| 64 | #define TSAR_MMU_PPN_WIDTH 28 |
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| 65 | |
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[401] | 66 | #define TSAR_MMU_PTE1_ATTR_MASK 0xFFC00000 |
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| 67 | #define TSAR_MMU_PTE1_PPN_MASK 0x0007FFFF |
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| 68 | |
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[1] | 69 | #define TSAR_MMU_IX1_FROM_VPN( vpn ) ((vpn >> 9) & 0x7FF) |
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| 70 | #define TSAR_MMU_IX2_FROM_VPN( vpn ) (vpn & 0x1FF) |
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| 71 | |
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[315] | 72 | #define TSAR_MMU_PTBA_FROM_PTE1( pte1 ) (pte1 & 0x0FFFFFFF) |
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| 73 | #define TSAR_MMU_PPN_FROM_PTE1( pte1 ) ((pte1 & 0x0007FFFF)<<9) |
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[1] | 74 | #define TSAR_MMU_ATTR_FROM_PTE1( pte1 ) (pte1 & 0xFFC00000) |
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| 75 | |
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| 76 | #define TSAR_MMU_PPN_FROM_PTE2( pte2 ) (pte2 & 0x0FFFFFFF) |
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| 77 | #define TSAR_MMU_ATTR_FROM_PTE2( pte2 ) (pte2 & 0xFFC000FF) |
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| 78 | |
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[401] | 79 | |
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| 80 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 81 | // This static function translates the GPT attributes to the TSAR attributes |
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| 82 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 83 | static inline uint32_t gpt2tsar( uint32_t gpt_attr ) |
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| 84 | { |
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| 85 | uint32_t tsar_attr = 0; |
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| 86 | |
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| 87 | if( gpt_attr & GPT_MAPPED ) tsar_attr |= TSAR_MMU_MAPPED; |
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| 88 | if( gpt_attr & GPT_SMALL ) tsar_attr |= TSAR_MMU_SMALL; |
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| 89 | if( gpt_attr & GPT_WRITABLE ) tsar_attr |= TSAR_MMU_WRITABLE; |
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| 90 | if( gpt_attr & GPT_EXECUTABLE ) tsar_attr |= TSAR_MMU_EXECUTABLE; |
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| 91 | if( gpt_attr & GPT_CACHABLE ) tsar_attr |= TSAR_MMU_CACHABLE; |
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| 92 | if( gpt_attr & GPT_USER ) tsar_attr |= TSAR_MMU_USER; |
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| 93 | if( gpt_attr & GPT_DIRTY ) tsar_attr |= TSAR_MMU_DIRTY; |
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| 94 | if( gpt_attr & GPT_ACCESSED ) tsar_attr |= TSAR_MMU_LOCAL; |
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| 95 | if( gpt_attr & GPT_GLOBAL ) tsar_attr |= TSAR_MMU_GLOBAL; |
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| 96 | if( gpt_attr & GPT_COW ) tsar_attr |= TSAR_MMU_COW; |
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| 97 | if( gpt_attr & GPT_SWAP ) tsar_attr |= TSAR_MMU_SWAP; |
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| 98 | if( gpt_attr & GPT_LOCKED ) tsar_attr |= TSAR_MMU_LOCKED; |
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| 99 | |
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| 100 | return tsar_attr; |
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| 101 | } |
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| 102 | |
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| 103 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 104 | // This static function translates the TSAR attributes to the GPT attributes |
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| 105 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 106 | static inline uint32_t tsar2gpt( uint32_t tsar_attr ) |
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| 107 | { |
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| 108 | uint32_t gpt_attr = 0; |
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| 109 | |
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| 110 | if( tsar_attr & TSAR_MMU_MAPPED ) gpt_attr |= GPT_MAPPED; |
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| 111 | if( tsar_attr & TSAR_MMU_MAPPED ) gpt_attr |= GPT_READABLE; |
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| 112 | if( tsar_attr & TSAR_MMU_SMALL ) gpt_attr |= GPT_SMALL; |
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| 113 | if( tsar_attr & TSAR_MMU_WRITABLE ) gpt_attr |= GPT_WRITABLE; |
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| 114 | if( tsar_attr & TSAR_MMU_EXECUTABLE ) gpt_attr |= GPT_EXECUTABLE; |
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| 115 | if( tsar_attr & TSAR_MMU_CACHABLE ) gpt_attr |= GPT_CACHABLE; |
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| 116 | if( tsar_attr & TSAR_MMU_USER ) gpt_attr |= GPT_USER; |
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| 117 | if( tsar_attr & TSAR_MMU_DIRTY ) gpt_attr |= GPT_DIRTY; |
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| 118 | if( tsar_attr & TSAR_MMU_LOCAL ) gpt_attr |= GPT_ACCESSED; |
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| 119 | if( tsar_attr & TSAR_MMU_REMOTE ) gpt_attr |= GPT_ACCESSED; |
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| 120 | if( tsar_attr & TSAR_MMU_GLOBAL ) gpt_attr |= GPT_GLOBAL; |
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| 121 | if( tsar_attr & TSAR_MMU_COW ) gpt_attr |= GPT_COW; |
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| 122 | if( tsar_attr & TSAR_MMU_SWAP ) gpt_attr |= GPT_SWAP; |
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| 123 | if( tsar_attr & TSAR_MMU_LOCKED ) gpt_attr |= GPT_LOCKED; |
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| 124 | |
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| 125 | return gpt_attr; |
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| 126 | } |
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| 127 | |
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[1] | 128 | ///////////////////////////////////// |
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| 129 | error_t hal_gpt_create( gpt_t * gpt ) |
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| 130 | { |
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| 131 | page_t * page; |
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[315] | 132 | xptr_t page_xp; |
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[1] | 133 | |
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[438] | 134 | #if DEBUG_GPT_ACCESS |
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[432] | 135 | uint32_t cycle = (uint32_t)hal_get_cycles; |
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[438] | 136 | if( DEBUG_GPT_ACCESS < cycle ) |
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[432] | 137 | printk("\n[DBG] %s : thread %x enter / cycle %d\n", |
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| 138 | __FUNCTION__, CURRENT_THREAD, cycle ); |
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| 139 | #endif |
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[406] | 140 | |
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[1] | 141 | // check page size |
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[406] | 142 | assert( (CONFIG_PPM_PAGE_SIZE == 4096) , __FUNCTION__ , |
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[440] | 143 | "for TSAR, the page size must be 4 Kbytes\n" ); |
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[1] | 144 | |
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| 145 | // allocates 2 physical pages for PT1 |
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| 146 | kmem_req_t req; |
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| 147 | req.type = KMEM_PAGE; |
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| 148 | req.size = 1; // 2 small pages |
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| 149 | req.flags = AF_KERNEL | AF_ZERO; |
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| 150 | page = (page_t *)kmem_alloc( &req ); |
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| 151 | |
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[406] | 152 | if( page == NULL ) |
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[1] | 153 | { |
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[406] | 154 | printk("\n[ERROR] in %s : cannot allocate memory for PT1\n", __FUNCTION__ ); |
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[1] | 155 | return ENOMEM; |
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[406] | 156 | } |
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[1] | 157 | |
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| 158 | // initialize generic page table descriptor |
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[315] | 159 | page_xp = XPTR( local_cxy , page ); |
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| 160 | gpt->ptr = GET_PTR( ppm_page2base( page_xp ) ); |
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| 161 | gpt->ppn = ppm_page2ppn( page_xp ); |
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| 162 | |
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[438] | 163 | #if DEBUG_GPT_ACCESS |
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[432] | 164 | cycle = (uint32_t)hal_get_cycles; |
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[438] | 165 | if( DEBUG_GPT_ACCESS < cycle ) |
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[432] | 166 | printk("\n[DBG] %s : thread %x exit / cycle %d\n", |
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| 167 | __FUNCTION__, CURRENT_THREAD, cycle ); |
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| 168 | #endif |
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[406] | 169 | |
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[1] | 170 | return 0; |
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[406] | 171 | |
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[1] | 172 | } // end hal_gpt_create() |
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| 173 | |
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| 174 | |
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| 175 | /////////////////////////////////// |
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| 176 | void hal_gpt_destroy( gpt_t * gpt ) |
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| 177 | { |
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| 178 | uint32_t ix1; |
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| 179 | uint32_t ix2; |
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| 180 | uint32_t * pt1; |
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| 181 | uint32_t pte1; |
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| 182 | ppn_t pt2_ppn; |
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| 183 | uint32_t * pt2; |
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| 184 | uint32_t attr; |
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| 185 | vpn_t vpn; |
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| 186 | kmem_req_t req; |
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| 187 | bool_t is_ref; |
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| 188 | |
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| 189 | // get pointer on calling process |
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| 190 | process_t * process = CURRENT_THREAD->process; |
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| 191 | |
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| 192 | // compute is_ref |
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[23] | 193 | is_ref = ( GET_CXY( process->ref_xp ) == local_cxy ); |
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[1] | 194 | |
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| 195 | // get pointer on PT1 |
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| 196 | pt1 = (uint32_t *)gpt->ptr; |
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| 197 | |
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| 198 | // scan the PT1 |
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| 199 | for( ix1 = 0 ; ix1 < 2048 ; ix1++ ) |
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| 200 | { |
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| 201 | pte1 = pt1[ix1]; |
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[401] | 202 | if( (pte1 & TSAR_MMU_MAPPED) != 0 ) // PTE1 valid |
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[1] | 203 | { |
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[401] | 204 | if( (pte1 & TSAR_MMU_SMALL) == 0 ) // BIG page |
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[1] | 205 | { |
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[391] | 206 | if( (pte1 & TSAR_MMU_USER) != 0 ) |
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[1] | 207 | { |
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| 208 | // warning message |
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| 209 | printk("\n[WARNING] in %s : found an USER BIG page / ix1 = %d\n", |
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[391] | 210 | __FUNCTION__ , ix1 ); |
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[1] | 211 | |
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| 212 | // release the big physical page if reference cluster |
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| 213 | if( is_ref ) |
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| 214 | { |
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| 215 | vpn = (vpn_t)(ix1 << TSAR_MMU_IX2_WIDTH); |
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| 216 | hal_gpt_reset_pte( gpt , vpn ); |
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| 217 | } |
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| 218 | } |
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| 219 | } |
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[391] | 220 | else // SMALL page |
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[1] | 221 | { |
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[315] | 222 | // get local pointer on PT2 |
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[1] | 223 | pt2_ppn = TSAR_MMU_PTBA_FROM_PTE1( pte1 ); |
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[315] | 224 | xptr_t base_xp = ppm_ppn2base( pt2_ppn ); |
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| 225 | pt2 = (uint32_t *)GET_PTR( base_xp ); |
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[1] | 226 | |
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| 227 | // scan the PT2 to release all entries VALID and USER if reference cluster |
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| 228 | if( is_ref ) |
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| 229 | { |
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| 230 | for( ix2 = 0 ; ix2 < 512 ; ix2++ ) |
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| 231 | { |
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| 232 | attr = TSAR_MMU_ATTR_FROM_PTE2( pt2[2 * ix2] ); |
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[401] | 233 | if( ((attr & TSAR_MMU_MAPPED) != 0 ) && ((attr & TSAR_MMU_USER) != 0) ) |
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[1] | 234 | { |
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| 235 | // release the physical page |
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| 236 | vpn = (vpn_t)((ix1 << TSAR_MMU_IX2_WIDTH) | ix2); |
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| 237 | hal_gpt_reset_pte( gpt , vpn ); |
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| 238 | } |
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| 239 | } |
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| 240 | } |
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| 241 | |
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| 242 | // release the PT2 |
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| 243 | req.type = KMEM_PAGE; |
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[315] | 244 | req.ptr = GET_PTR( ppm_base2page( XPTR(local_cxy , pt2 ) ) ); |
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[1] | 245 | kmem_free( &req ); |
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| 246 | } |
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| 247 | } |
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| 248 | } |
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| 249 | |
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| 250 | // release the PT1 |
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| 251 | req.type = KMEM_PAGE; |
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[315] | 252 | req.ptr = GET_PTR( ppm_base2page( XPTR(local_cxy , pt1 ) ) ); |
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[1] | 253 | kmem_free( &req ); |
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| 254 | |
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| 255 | } // end hal_gpt_destroy() |
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| 256 | |
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[407] | 257 | /////////////////////////////////////////// |
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| 258 | void hal_gpt_display( process_t * process ) |
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[1] | 259 | { |
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[407] | 260 | gpt_t * gpt; |
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[1] | 261 | uint32_t ix1; |
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| 262 | uint32_t ix2; |
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| 263 | uint32_t * pt1; |
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| 264 | uint32_t pte1; |
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| 265 | ppn_t pt2_ppn; |
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| 266 | uint32_t * pt2; |
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| 267 | uint32_t pte2_attr; |
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| 268 | ppn_t pte2_ppn; |
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[406] | 269 | vpn_t vpn; |
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[1] | 270 | |
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[407] | 271 | assert( (process != NULL) , __FUNCTION__ , "NULL process pointer\n"); |
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[1] | 272 | |
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[407] | 273 | // get pointer on gpt |
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| 274 | gpt = &(process->vmm.gpt); |
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| 275 | |
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| 276 | // get pointer on PT1 |
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[1] | 277 | pt1 = (uint32_t *)gpt->ptr; |
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| 278 | |
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[406] | 279 | printk("\n***** Generic Page Table for process %x : &gpt = %x / &pt1 = %x\n\n", |
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[407] | 280 | process->pid , gpt , pt1 ); |
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[406] | 281 | |
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[1] | 282 | // scan the PT1 |
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| 283 | for( ix1 = 0 ; ix1 < 2048 ; ix1++ ) |
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| 284 | { |
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| 285 | pte1 = pt1[ix1]; |
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[401] | 286 | if( (pte1 & TSAR_MMU_MAPPED) != 0 ) |
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[1] | 287 | { |
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[401] | 288 | if( (pte1 & TSAR_MMU_SMALL) == 0 ) // BIG page |
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[1] | 289 | { |
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[406] | 290 | vpn = ix1 << 9; |
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| 291 | printk(" - BIG : vpn = %x / pt1[%d] = %X\n", vpn , ix1 , pte1 ); |
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[1] | 292 | } |
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| 293 | else // SMALL pages |
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| 294 | { |
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| 295 | pt2_ppn = TSAR_MMU_PTBA_FROM_PTE1( pte1 ); |
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[315] | 296 | xptr_t base_xp = ppm_ppn2base ( pt2_ppn ); |
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| 297 | pt2 = (uint32_t *)GET_PTR( base_xp ); |
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[1] | 298 | |
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| 299 | // scan the PT2 |
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| 300 | for( ix2 = 0 ; ix2 < 512 ; ix2++ ) |
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| 301 | { |
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| 302 | pte2_attr = TSAR_MMU_ATTR_FROM_PTE2( pt2[2 * ix2] ); |
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| 303 | pte2_ppn = TSAR_MMU_PPN_FROM_PTE2( pt2[2 * ix2 + 1] ); |
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[406] | 304 | |
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[401] | 305 | if( (pte2_attr & TSAR_MMU_MAPPED) != 0 ) |
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[1] | 306 | { |
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[406] | 307 | vpn = (ix1 << 9) | ix2; |
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[408] | 308 | printk(" - SMALL : vpn %X / ppn %X / attr %X\n", |
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| 309 | vpn , pte2_ppn , tsar2gpt(pte2_attr) ); |
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[1] | 310 | } |
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| 311 | } |
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| 312 | } |
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| 313 | } |
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| 314 | } |
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[407] | 315 | } // end hal_gpt_display() |
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[1] | 316 | |
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| 317 | |
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| 318 | /////////////////////////////////////// |
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| 319 | error_t hal_gpt_set_pte( gpt_t * gpt, |
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| 320 | vpn_t vpn, |
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[408] | 321 | uint32_t attr, // generic GPT attributes |
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| 322 | ppn_t ppn ) |
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[1] | 323 | { |
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[406] | 324 | uint32_t * pt1; // PT1 base addres |
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| 325 | uint32_t * pte1_ptr; // pointer on PT1 entry |
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[401] | 326 | uint32_t pte1; // PT1 entry value |
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[1] | 327 | |
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[401] | 328 | ppn_t pt2_ppn; // PPN of PT2 |
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[406] | 329 | uint32_t * pt2; // PT2 base address |
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[1] | 330 | |
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[401] | 331 | uint32_t small; // requested PTE is for a small page |
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[406] | 332 | bool_t success; // exit condition for while loop below |
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[315] | 333 | |
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[401] | 334 | page_t * page; // pointer on new physical page descriptor |
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| 335 | xptr_t page_xp; // extended pointer on new page descriptor |
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[1] | 336 | |
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[401] | 337 | uint32_t ix1; // index in PT1 |
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| 338 | uint32_t ix2; // index in PT2 |
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[1] | 339 | |
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[401] | 340 | uint32_t tsar_attr; // PTE attributes for TSAR MMU |
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| 341 | |
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[438] | 342 | #if DEBUG_GPT_ACCESS |
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[432] | 343 | uint32_t cycle = (uint32_t)hal_get_cycles; |
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[438] | 344 | if( DEBUG_GPT_ACCESS < cycle ) |
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[432] | 345 | printk("\n[DBG] %s : thread %x enter / vpn %x / attr %x / ppn %x / cycle %d\n", |
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| 346 | __FUNCTION__, CURRENT_THREAD, vpn, attr, ppn, cycle ); |
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| 347 | #endif |
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| 348 | |
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[1] | 349 | // compute indexes in PT1 and PT2 |
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| 350 | ix1 = TSAR_MMU_IX1_FROM_VPN( vpn ); |
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| 351 | ix2 = TSAR_MMU_IX2_FROM_VPN( vpn ); |
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| 352 | |
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| 353 | pt1 = gpt->ptr; |
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[401] | 354 | small = attr & GPT_SMALL; |
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[1] | 355 | |
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[432] | 356 | // compute tsar attributes from generic attributes |
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[401] | 357 | tsar_attr = gpt2tsar( attr ); |
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| 358 | |
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[438] | 359 | #if (DEBUG_GPT_ACCESS & 1) |
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| 360 | if( DEBUG_GPT_ACCESS < cycle ) |
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[432] | 361 | printk("\n[DBG] %s : thread %x / vpn %x / &pt1 %x / tsar_attr %x\n", |
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| 362 | __FUNCTION__, CURRENT_THREAD, vpn, pt1, tsar_attr ); |
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| 363 | #endif |
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[406] | 364 | |
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| 365 | // get pointer on PT1[ix1] |
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[1] | 366 | pte1_ptr = &pt1[ix1]; |
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| 367 | |
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[406] | 368 | // PTE1 (big page) are only set for the kernel vsegs, in the kernel init phase. |
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[1] | 369 | // There is no risk of concurrent access. |
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[401] | 370 | if( small == 0 ) |
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| 371 | { |
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[406] | 372 | // get current pte1 value |
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| 373 | pte1 = *pte1_ptr; |
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| 374 | |
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| 375 | assert( (pte1 == 0) , __FUNCTION__ , |
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| 376 | "try to set a big page in a mapped PT1 entry / PT1[%d] = %x\n", ix1 , pte1 ); |
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[1] | 377 | |
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| 378 | // set the PTE1 |
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[401] | 379 | *pte1_ptr = (tsar_attr & TSAR_MMU_PTE1_ATTR_MASK) | |
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| 380 | ((ppn >> 9) & TSAR_MMU_PTE1_PPN_MASK); |
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[124] | 381 | hal_fence(); |
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[1] | 382 | return 0; |
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| 383 | } |
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| 384 | |
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| 385 | // From this point, the requested PTE is a PTE2 (small page) |
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| 386 | |
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[406] | 387 | // loop to access PTE1 and get pointer on PT2 |
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| 388 | success = false; |
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| 389 | do |
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| 390 | { |
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| 391 | // get current pte1 value |
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| 392 | pte1 = *pte1_ptr; |
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| 393 | |
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[438] | 394 | #if (DEBUG_GPT_ACCESS & 1) |
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| 395 | if( DEBUG_GPT_ACCESS < cycle ) |
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[432] | 396 | printk("\n[DBG] %s : thread %x / vpn %x / current_pte1 %x\n", |
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| 397 | __FUNCTION__, CURRENT_THREAD, vpn, pte1 ); |
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| 398 | #endif |
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[406] | 399 | |
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| 400 | // allocate a PT2 if PT1 entry not valid |
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| 401 | if( (pte1 & TSAR_MMU_MAPPED) == 0 ) // PT1 entry not valid |
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| 402 | { |
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| 403 | // allocate one physical page for the PT2 |
---|
| 404 | kmem_req_t req; |
---|
| 405 | req.type = KMEM_PAGE; |
---|
| 406 | req.size = 0; // 1 small page |
---|
| 407 | req.flags = AF_KERNEL | AF_ZERO; |
---|
| 408 | page = (page_t *)kmem_alloc( &req ); |
---|
| 409 | if( page == NULL ) |
---|
| 410 | { |
---|
| 411 | printk("\n[ERROR] in %s : cannot allocate PT2\n", __FUNCTION__ ); |
---|
| 412 | return ENOMEM; |
---|
| 413 | } |
---|
[1] | 414 | |
---|
[406] | 415 | // get the PT2 PPN |
---|
| 416 | page_xp = XPTR( local_cxy , page ); |
---|
| 417 | pt2_ppn = ppm_page2ppn( page_xp ); |
---|
[315] | 418 | |
---|
[406] | 419 | // try to atomicaly set the PT1 entry |
---|
| 420 | pte1 = TSAR_MMU_MAPPED | TSAR_MMU_SMALL | pt2_ppn; |
---|
| 421 | success = hal_atomic_cas( pte1_ptr , 0 , pte1 ); |
---|
[1] | 422 | |
---|
[406] | 423 | // release allocated PT2 if PT1 entry modified by another thread |
---|
| 424 | if( success == false ) ppm_free_pages( page ); |
---|
| 425 | } |
---|
| 426 | else // PT1 entry is valid |
---|
[1] | 427 | { |
---|
[406] | 428 | // This valid entry must be a PTD1 |
---|
| 429 | assert( (pte1 & TSAR_MMU_SMALL) , __FUNCTION__ , |
---|
| 430 | "try to set a small page in a big PT1 entry / PT1[%d] = %x\n", ix1 , pte1 ); |
---|
[1] | 431 | |
---|
[406] | 432 | success = true; |
---|
[1] | 433 | } |
---|
| 434 | |
---|
[406] | 435 | // get PT2 base from pte1 |
---|
| 436 | pt2_ppn = TSAR_MMU_PTBA_FROM_PTE1( pte1 ); |
---|
| 437 | pt2 = (uint32_t *)GET_PTR( ppm_ppn2base( pt2_ppn ) ); |
---|
[1] | 438 | |
---|
[438] | 439 | #if (DEBUG_GPT_ACCESS & 1) |
---|
| 440 | if( DEBUG_GPT_ACCESS < cycle ) |
---|
[432] | 441 | printk("\n[DBG] %s : thread %x / vpn %x / pte1 %x / &pt2 %x\n", |
---|
| 442 | __FUNCTION__, CURRENT_THREAD, vpn, pte1, pt2 ); |
---|
| 443 | #endif |
---|
[406] | 444 | |
---|
| 445 | } |
---|
| 446 | while (success == false); |
---|
[1] | 447 | |
---|
| 448 | // set PTE2 in this order |
---|
| 449 | pt2[2 * ix2 + 1] = ppn; |
---|
[124] | 450 | hal_fence(); |
---|
[401] | 451 | pt2[2 * ix2] = tsar_attr; |
---|
[124] | 452 | hal_fence(); |
---|
[1] | 453 | |
---|
[438] | 454 | #if DEBUG_GPT_ACCESS |
---|
[432] | 455 | cycle = (uint32_t)hal_get_cycles; |
---|
[438] | 456 | if( DEBUG_GPT_ACCESS < cycle ) |
---|
[432] | 457 | printk("\n[DBG] %s : thread %x exit / vpn %x / pte2_attr %x / pte2_ppn %x / cycle %d\n", |
---|
| 458 | __FUNCTION__, CURRENT_THREAD, vpn, pt2[2 * ix2], pt2[2 * ix2 + 1], cycle ); |
---|
| 459 | #endif |
---|
| 460 | |
---|
[1] | 461 | return 0; |
---|
[401] | 462 | |
---|
[1] | 463 | } // end of hal_gpt_set_pte() |
---|
| 464 | |
---|
[406] | 465 | |
---|
[1] | 466 | ///////////////////////////////////// |
---|
| 467 | void hal_gpt_get_pte( gpt_t * gpt, |
---|
| 468 | vpn_t vpn, |
---|
| 469 | uint32_t * attr, |
---|
| 470 | ppn_t * ppn ) |
---|
| 471 | { |
---|
| 472 | uint32_t * pt1; |
---|
| 473 | uint32_t pte1; |
---|
| 474 | |
---|
| 475 | uint32_t * pt2; |
---|
| 476 | ppn_t pt2_ppn; |
---|
| 477 | |
---|
| 478 | uint32_t ix1 = TSAR_MMU_IX1_FROM_VPN( vpn ); |
---|
| 479 | uint32_t ix2 = TSAR_MMU_IX2_FROM_VPN( vpn ); |
---|
| 480 | |
---|
| 481 | // get PTE1 value |
---|
| 482 | pt1 = gpt->ptr; |
---|
| 483 | pte1 = pt1[ix1]; |
---|
| 484 | |
---|
[401] | 485 | if( (pte1 & TSAR_MMU_MAPPED) == 0 ) // PT1 entry not present |
---|
[1] | 486 | { |
---|
| 487 | *attr = 0; |
---|
| 488 | *ppn = 0; |
---|
| 489 | } |
---|
| 490 | |
---|
[401] | 491 | if( (pte1 & TSAR_MMU_SMALL) == 0 ) // it's a PTE1 |
---|
[1] | 492 | { |
---|
[401] | 493 | *attr = tsar2gpt( TSAR_MMU_ATTR_FROM_PTE1( pte1 ) ); |
---|
[1] | 494 | *ppn = TSAR_MMU_PPN_FROM_PTE1( pte1 ) | (vpn & ((1<<TSAR_MMU_IX2_WIDTH)-1)); |
---|
| 495 | } |
---|
| 496 | else // it's a PTD1 |
---|
| 497 | { |
---|
| 498 | // compute PT2 base address |
---|
| 499 | pt2_ppn = TSAR_MMU_PTBA_FROM_PTE1( pte1 ); |
---|
[315] | 500 | pt2 = (uint32_t*)GET_PTR( ppm_ppn2base( pt2_ppn ) ); |
---|
[1] | 501 | |
---|
| 502 | *ppn = pt2[2*ix2+1] & ((1<<TSAR_MMU_PPN_WIDTH)-1); |
---|
[401] | 503 | *attr = tsar2gpt( pt2[2*ix2] ); |
---|
[1] | 504 | } |
---|
| 505 | } // end hal_gpt_get_pte() |
---|
| 506 | |
---|
| 507 | //////////////////////////////////// |
---|
| 508 | void hal_gpt_reset_pte( gpt_t * gpt, |
---|
| 509 | vpn_t vpn ) |
---|
| 510 | { |
---|
| 511 | uint32_t * pt1; // PT1 base address |
---|
| 512 | uint32_t pte1; // PT1 entry value |
---|
| 513 | |
---|
| 514 | ppn_t pt2_ppn; // PPN of PT2 |
---|
| 515 | uint32_t * pt2; // PT2 base address |
---|
| 516 | |
---|
| 517 | ppn_t ppn; // PPN of page to be released |
---|
| 518 | |
---|
[391] | 519 | // get ix1 & ix2 indexes |
---|
[1] | 520 | uint32_t ix1 = TSAR_MMU_IX1_FROM_VPN( vpn ); |
---|
| 521 | uint32_t ix2 = TSAR_MMU_IX2_FROM_VPN( vpn ); |
---|
| 522 | |
---|
| 523 | // get PTE1 value |
---|
| 524 | pt1 = gpt->ptr; |
---|
| 525 | pte1 = pt1[ix1]; |
---|
| 526 | |
---|
[401] | 527 | if( (pte1 & TSAR_MMU_MAPPED) == 0 ) // PT1 entry not present |
---|
[1] | 528 | { |
---|
| 529 | return; |
---|
| 530 | } |
---|
| 531 | |
---|
[401] | 532 | if( (pte1 & TSAR_MMU_SMALL) == 0 ) // it's a PTE1 |
---|
[1] | 533 | { |
---|
| 534 | // get PPN |
---|
| 535 | ppn = TSAR_MMU_PPN_FROM_PTE1( pte1 ); |
---|
| 536 | |
---|
| 537 | // unmap the big page |
---|
| 538 | pt1[ix1] = 0; |
---|
[124] | 539 | hal_fence(); |
---|
[1] | 540 | |
---|
| 541 | return; |
---|
| 542 | } |
---|
[391] | 543 | else // it's a PTD1 |
---|
[1] | 544 | { |
---|
| 545 | // compute PT2 base address |
---|
| 546 | pt2_ppn = TSAR_MMU_PTBA_FROM_PTE1( pte1 ); |
---|
[315] | 547 | pt2 = (uint32_t*)GET_PTR( ppm_ppn2base( pt2_ppn ) ); |
---|
[1] | 548 | |
---|
| 549 | // get PPN |
---|
| 550 | ppn = TSAR_MMU_PPN_FROM_PTE2( pt2[2*ix2+1] ); |
---|
| 551 | |
---|
| 552 | // unmap the small page |
---|
[391] | 553 | pt2[2*ix2] = 0; // only attr is reset |
---|
| 554 | hal_fence(); |
---|
[1] | 555 | |
---|
| 556 | return; |
---|
| 557 | } |
---|
| 558 | } // end hal_gpt_reset_pte() |
---|
| 559 | |
---|
| 560 | ////////////////////////////////////// |
---|
| 561 | error_t hal_gpt_lock_pte( gpt_t * gpt, |
---|
| 562 | vpn_t vpn ) |
---|
| 563 | { |
---|
| 564 | uint32_t * pt1; // PT1 base address |
---|
| 565 | volatile uint32_t * pte1_ptr; // address of PT1 entry |
---|
| 566 | uint32_t pte1; // value of PT1 entry |
---|
| 567 | |
---|
| 568 | uint32_t * pt2; // PT2 base address |
---|
| 569 | ppn_t pt2_ppn; // PPN of PT2 page if missing PT2 |
---|
| 570 | volatile uint32_t * pte2_ptr; // address of PT2 entry |
---|
| 571 | |
---|
| 572 | uint32_t attr; |
---|
| 573 | bool_t atomic; |
---|
| 574 | page_t * page; |
---|
[315] | 575 | xptr_t page_xp; |
---|
[1] | 576 | |
---|
| 577 | uint32_t ix1 = TSAR_MMU_IX1_FROM_VPN( vpn ); // index in PT1 |
---|
| 578 | uint32_t ix2 = TSAR_MMU_IX2_FROM_VPN( vpn ); // index in PT2 |
---|
| 579 | |
---|
| 580 | // get the PTE1 value |
---|
| 581 | pt1 = gpt->ptr; |
---|
| 582 | pte1_ptr = &pt1[ix1]; |
---|
| 583 | pte1 = *pte1_ptr; |
---|
| 584 | |
---|
| 585 | // If present, the page must be small |
---|
[401] | 586 | if( ((pte1 & TSAR_MMU_MAPPED) != 0) && ((pte1 & TSAR_MMU_SMALL) == 0) ) |
---|
[1] | 587 | { |
---|
| 588 | printk("\n[ERROR] in %s : try to lock a big page / PT1[%d] = %x\n", |
---|
| 589 | __FUNCTION__ , ix1 , pte1 ); |
---|
| 590 | return EINVAL; |
---|
| 591 | } |
---|
| 592 | |
---|
[401] | 593 | if( (pte1 & TSAR_MMU_MAPPED) == 0 ) // missing PT1 entry |
---|
[1] | 594 | { |
---|
| 595 | // allocate one physical page for PT2 |
---|
| 596 | kmem_req_t req; |
---|
| 597 | req.type = KMEM_PAGE; |
---|
| 598 | req.size = 0; // 1 small page |
---|
| 599 | req.flags = AF_KERNEL | AF_ZERO; |
---|
| 600 | page = (page_t *)kmem_alloc( &req ); |
---|
[23] | 601 | |
---|
[1] | 602 | if( page == NULL ) |
---|
| 603 | { |
---|
| 604 | printk("\n[ERROR] in %s : try to set a small page but cannot allocate PT2\n", |
---|
| 605 | __FUNCTION__ ); |
---|
| 606 | return ENOMEM; |
---|
| 607 | } |
---|
[23] | 608 | |
---|
[315] | 609 | page_xp = XPTR( local_cxy , page ); |
---|
| 610 | pt2_ppn = ppm_page2ppn( page_xp ); |
---|
| 611 | pt2 = (uint32_t *)GET_PTR( ppm_page2base( page_xp ) ); |
---|
[1] | 612 | |
---|
| 613 | // try to set the PT1 entry |
---|
| 614 | do |
---|
| 615 | { |
---|
| 616 | atomic = hal_atomic_cas( (void*)pte1_ptr , 0 , |
---|
[401] | 617 | TSAR_MMU_MAPPED | TSAR_MMU_SMALL | pt2_ppn ); |
---|
[1] | 618 | } |
---|
| 619 | while( (atomic == false) && (*pte1_ptr == 0) ); |
---|
| 620 | |
---|
| 621 | if( atomic == false ) // missing PT2 has been allocate by another core |
---|
| 622 | { |
---|
| 623 | // release the allocated page |
---|
| 624 | ppm_free_pages( page ); |
---|
| 625 | |
---|
| 626 | // read again the PTE1 |
---|
| 627 | pte1 = *pte1_ptr; |
---|
| 628 | |
---|
| 629 | // get the PT2 base address |
---|
| 630 | pt2_ppn = TSAR_MMU_PPN_FROM_PTE1( pte1 ); |
---|
[315] | 631 | pt2 = (uint32_t*)GET_PTR( ppm_ppn2base( pt2_ppn ) ); |
---|
[1] | 632 | } |
---|
| 633 | } |
---|
| 634 | else |
---|
| 635 | { |
---|
| 636 | // This valid entry must be a PTD1 |
---|
[401] | 637 | if( (pte1 & TSAR_MMU_SMALL) == 0 ) |
---|
[1] | 638 | { |
---|
| 639 | printk("\n[ERROR] in %s : set a small page in a big PT1 entry / PT1[%d] = %x\n", |
---|
| 640 | __FUNCTION__ , ix1 , pte1 ); |
---|
| 641 | return EINVAL; |
---|
| 642 | } |
---|
| 643 | |
---|
| 644 | // compute PPN of PT2 base |
---|
| 645 | pt2_ppn = TSAR_MMU_PTBA_FROM_PTE1( pte1 ); |
---|
| 646 | |
---|
| 647 | // compute pointer on PT2 base |
---|
[315] | 648 | pt2 = (uint32_t *)GET_PTR( ppm_ppn2base( pt2_ppn ) ); |
---|
[1] | 649 | } |
---|
| 650 | |
---|
| 651 | // from here we have the PT2 pointer |
---|
| 652 | |
---|
| 653 | // compute pointer on PTE2 |
---|
| 654 | pte2_ptr = &pt2[2 * ix2]; |
---|
| 655 | |
---|
| 656 | // try to atomically lock the PTE2 until success |
---|
| 657 | do |
---|
| 658 | { |
---|
[401] | 659 | // busy waiting until TSAR_MMU_LOCK == 0 |
---|
[1] | 660 | do |
---|
| 661 | { |
---|
| 662 | attr = *pte2_ptr; |
---|
| 663 | hal_rdbar(); |
---|
| 664 | } |
---|
[401] | 665 | while( (attr & TSAR_MMU_LOCKED) != 0 ); |
---|
[1] | 666 | |
---|
[401] | 667 | atomic = hal_atomic_cas( (void*)pte2_ptr, attr , (attr | TSAR_MMU_LOCKED) ); |
---|
[1] | 668 | } |
---|
| 669 | while( atomic == 0 ); |
---|
| 670 | |
---|
| 671 | return 0; |
---|
[401] | 672 | |
---|
[1] | 673 | } // end hal_gpt_lock_pte() |
---|
| 674 | |
---|
| 675 | //////////////////////////////////////// |
---|
| 676 | error_t hal_gpt_unlock_pte( gpt_t * gpt, |
---|
| 677 | vpn_t vpn ) |
---|
| 678 | { |
---|
| 679 | uint32_t * pt1; // PT1 base address |
---|
| 680 | uint32_t pte1; // value of PT1 entry |
---|
| 681 | |
---|
| 682 | uint32_t * pt2; // PT2 base address |
---|
| 683 | ppn_t pt2_ppn; // PPN of PT2 page if missing PT2 |
---|
| 684 | uint32_t * pte2_ptr; // address of PT2 entry |
---|
| 685 | |
---|
| 686 | uint32_t attr; // PTE2 attribute |
---|
| 687 | |
---|
| 688 | // compute indexes in P1 and PT2 |
---|
| 689 | uint32_t ix1 = TSAR_MMU_IX1_FROM_VPN( vpn ); // index in PT1 |
---|
| 690 | uint32_t ix2 = TSAR_MMU_IX2_FROM_VPN( vpn ); // index in PT2 |
---|
| 691 | |
---|
| 692 | // get pointer on PT1 base |
---|
| 693 | pt1 = (uint32_t*)gpt->ptr; |
---|
| 694 | |
---|
| 695 | // get PTE1 |
---|
| 696 | pte1 = pt1[ix1]; |
---|
| 697 | |
---|
| 698 | // check PTE1 present and small page |
---|
[401] | 699 | if( ((pte1 & TSAR_MMU_MAPPED) == 0) || ((pte1 & TSAR_MMU_SMALL) == 0) ) |
---|
[1] | 700 | { |
---|
| 701 | printk("\n[ERROR] in %s : try to unlock a big or undefined page / PT1[%d] = %x\n", |
---|
| 702 | __FUNCTION__ , ix1 , pte1 ); |
---|
| 703 | return EINVAL; |
---|
| 704 | } |
---|
| 705 | |
---|
| 706 | // get pointer on PT2 base |
---|
| 707 | pt2_ppn = TSAR_MMU_PPN_FROM_PTE1( pte1 ); |
---|
[315] | 708 | pt2 = (uint32_t *)GET_PTR( ppm_ppn2base( pt2_ppn ) ); |
---|
[1] | 709 | |
---|
| 710 | // get pointer on PTE2 |
---|
| 711 | pte2_ptr = &pt2[2 * ix2]; |
---|
| 712 | |
---|
| 713 | // get PTE2_ATTR |
---|
| 714 | attr = *pte2_ptr; |
---|
| 715 | |
---|
| 716 | // check PTE2 present and locked |
---|
[420] | 717 | if( ((attr & TSAR_MMU_MAPPED) == 0) || ((attr & TSAR_MMU_LOCKED) == 0) ) |
---|
[1] | 718 | { |
---|
[401] | 719 | printk("\n[ERROR] in %s : unlock an unlocked/unmapped page / PT1[%d] = %x\n", |
---|
[1] | 720 | __FUNCTION__ , ix1 , pte1 ); |
---|
| 721 | return EINVAL; |
---|
| 722 | } |
---|
| 723 | |
---|
| 724 | // reset GPT_LOCK |
---|
[401] | 725 | *pte2_ptr = attr & ~TSAR_MMU_LOCKED; |
---|
[1] | 726 | |
---|
| 727 | return 0; |
---|
[401] | 728 | |
---|
[1] | 729 | } // end hal_gpt_unlock_pte() |
---|
| 730 | |
---|
[408] | 731 | /////////////////////////////////////////// |
---|
| 732 | error_t hal_gpt_pte_copy( gpt_t * dst_gpt, |
---|
| 733 | xptr_t src_gpt_xp, |
---|
| 734 | vpn_t vpn, |
---|
| 735 | bool_t cow, |
---|
| 736 | ppn_t * ppn, |
---|
| 737 | bool_t * mapped ) |
---|
[23] | 738 | { |
---|
| 739 | uint32_t ix1; // index in PT1 |
---|
| 740 | uint32_t ix2; // index in PT2 |
---|
[1] | 741 | |
---|
[408] | 742 | cxy_t src_cxy; // SRC GPT cluster |
---|
| 743 | gpt_t * src_gpt; // SRC GPT local pointer |
---|
[1] | 744 | |
---|
[408] | 745 | uint32_t * src_pt1; // local pointer on SRC PT1 |
---|
| 746 | uint32_t * dst_pt1; // local pointer on DST PT1 |
---|
| 747 | uint32_t * src_pt2; // local pointer on SRC PT2 |
---|
| 748 | uint32_t * dst_pt2; // local pointer on DST PT2 |
---|
| 749 | |
---|
[407] | 750 | kmem_req_t req; // for dynamic PT2 allocation |
---|
| 751 | |
---|
| 752 | uint32_t src_pte1; |
---|
| 753 | uint32_t dst_pte1; |
---|
| 754 | |
---|
[408] | 755 | uint32_t src_pte2_attr; |
---|
| 756 | uint32_t src_pte2_ppn; |
---|
[1] | 757 | |
---|
[23] | 758 | page_t * page; |
---|
[315] | 759 | xptr_t page_xp; |
---|
[1] | 760 | |
---|
[23] | 761 | ppn_t src_pt2_ppn; |
---|
| 762 | ppn_t dst_pt2_ppn; |
---|
[1] | 763 | |
---|
[438] | 764 | #if DEBUG_GPT_ACCESS |
---|
[432] | 765 | uint32_t cycle = (uint32_t)hal_get_cycles; |
---|
[438] | 766 | if( DEBUG_GPT_ACCESS < cycle ) |
---|
[432] | 767 | printk("\n[DBG] %s : thread %x enter / vpn %x / cycle %d\n", |
---|
| 768 | __FUNCTION__, CURRENT_THREAD, vpn, cycle ); |
---|
| 769 | #endif |
---|
[407] | 770 | |
---|
[408] | 771 | // get remote src_gpt cluster and local pointer |
---|
| 772 | src_cxy = GET_CXY( src_gpt_xp ); |
---|
| 773 | src_gpt = (gpt_t *)GET_PTR( src_gpt_xp ); |
---|
[407] | 774 | |
---|
[408] | 775 | // get remote src_pt1 and local dst_pt1 |
---|
| 776 | src_pt1 = (uint32_t *)hal_remote_lpt( XPTR( src_cxy , &src_gpt->ptr ) ); |
---|
[23] | 777 | dst_pt1 = (uint32_t *)dst_gpt->ptr; |
---|
[1] | 778 | |
---|
[408] | 779 | // check src_pt1 and dst_pt1 existence |
---|
| 780 | assert( (src_pt1 != NULL) , __FUNCTION__ , "src_pt1 does not exist\n"); |
---|
| 781 | assert( (dst_pt1 != NULL) , __FUNCTION__ , "dst_pt1 does not exist\n"); |
---|
[407] | 782 | |
---|
[408] | 783 | ix1 = TSAR_MMU_IX1_FROM_VPN( vpn ); |
---|
| 784 | ix2 = TSAR_MMU_IX2_FROM_VPN( vpn ); |
---|
[407] | 785 | |
---|
[408] | 786 | // get src_pte1 |
---|
| 787 | src_pte1 = hal_remote_lw( XPTR( src_cxy , &src_pt1[ix1] ) ); |
---|
[407] | 788 | |
---|
[408] | 789 | // do nothing if src_pte1 not MAPPED or not SMALL |
---|
| 790 | if( (src_pte1 & TSAR_MMU_MAPPED) && (src_pte1 & TSAR_MMU_SMALL) ) |
---|
| 791 | { |
---|
| 792 | // get dst_pt1 entry |
---|
| 793 | dst_pte1 = dst_pt1[ix1]; |
---|
[407] | 794 | |
---|
[408] | 795 | // map dst_pte1 if required |
---|
| 796 | if( (dst_pte1 & TSAR_MMU_MAPPED) == 0 ) |
---|
| 797 | { |
---|
| 798 | // allocate one physical page for a new PT2 |
---|
| 799 | req.type = KMEM_PAGE; |
---|
| 800 | req.size = 0; // 1 small page |
---|
| 801 | req.flags = AF_KERNEL | AF_ZERO; |
---|
| 802 | page = (page_t *)kmem_alloc( &req ); |
---|
[407] | 803 | |
---|
[408] | 804 | if( page == NULL ) |
---|
| 805 | { |
---|
| 806 | printk("\n[ERROR] in %s : cannot allocate PT2\n", __FUNCTION__ ); |
---|
| 807 | return -1; |
---|
| 808 | } |
---|
[407] | 809 | |
---|
[408] | 810 | // build extended pointer on page descriptor |
---|
| 811 | page_xp = XPTR( local_cxy , page ); |
---|
[407] | 812 | |
---|
[408] | 813 | // get PPN for this new PT2 |
---|
| 814 | dst_pt2_ppn = (ppn_t)ppm_page2ppn( page_xp ); |
---|
[407] | 815 | |
---|
[408] | 816 | // build the new dst_pte1 |
---|
| 817 | dst_pte1 = TSAR_MMU_MAPPED | TSAR_MMU_SMALL | dst_pt2_ppn; |
---|
[407] | 818 | |
---|
[408] | 819 | // register it in DST_GPT |
---|
| 820 | dst_pt1[ix1] = dst_pte1; |
---|
| 821 | } |
---|
[407] | 822 | |
---|
[408] | 823 | // get pointer on src_pt2 |
---|
| 824 | src_pt2_ppn = (ppn_t)TSAR_MMU_PTBA_FROM_PTE1( src_pte1 ); |
---|
| 825 | src_pt2 = (uint32_t *)GET_PTR( ppm_ppn2base( src_pt2_ppn ) ); |
---|
[407] | 826 | |
---|
[408] | 827 | // get pointer on dst_pt2 |
---|
| 828 | dst_pt2_ppn = (ppn_t)TSAR_MMU_PTBA_FROM_PTE1( dst_pte1 ); |
---|
| 829 | dst_pt2 = (uint32_t *)GET_PTR( ppm_ppn2base( dst_pt2_ppn ) ); |
---|
[407] | 830 | |
---|
[408] | 831 | // get attr and ppn from SRC_PT2 |
---|
| 832 | src_pte2_attr = hal_remote_lw( XPTR( src_cxy , &src_pt2[2 * ix2] ) ); |
---|
| 833 | src_pte2_ppn = hal_remote_lw( XPTR( src_cxy , &src_pt2[2 * ix2 + 1] ) ); |
---|
[407] | 834 | |
---|
[408] | 835 | // do nothing if src_pte2 not MAPPED |
---|
| 836 | if( (src_pte2_attr & TSAR_MMU_MAPPED) != 0 ) |
---|
| 837 | { |
---|
| 838 | // set PPN in DST PTE2 |
---|
| 839 | dst_pt2[2*ix2+1] = src_pte2_ppn; |
---|
| 840 | |
---|
| 841 | // set attributes in DST PTE2 |
---|
| 842 | if( cow && (src_pte2_attr & TSAR_MMU_WRITABLE) ) |
---|
[407] | 843 | { |
---|
[408] | 844 | dst_pt2[2*ix2] = (src_pte2_attr | TSAR_MMU_COW) & (~TSAR_MMU_WRITABLE); |
---|
| 845 | } |
---|
| 846 | else |
---|
| 847 | { |
---|
| 848 | dst_pt2[2*ix2] = src_pte2_attr; |
---|
| 849 | } |
---|
[407] | 850 | |
---|
[408] | 851 | // return "successfully copied" |
---|
| 852 | *mapped = true; |
---|
| 853 | *ppn = src_pte2_ppn; |
---|
| 854 | |
---|
[438] | 855 | #if DEBUG_GPT_ACCESS |
---|
[432] | 856 | cycle = (uint32_t)hal_get_cycles; |
---|
[438] | 857 | if( DEBUG_GPT_ACCESS < cycle ) |
---|
[432] | 858 | printk("\n[DBG] %s : thread %x exit / copy done for vpn %x / cycle %d\n", |
---|
| 859 | __FUNCTION__, CURRENT_THREAD, vpn, cycle ); |
---|
| 860 | #endif |
---|
[407] | 861 | |
---|
[408] | 862 | hal_fence(); |
---|
[407] | 863 | |
---|
[408] | 864 | return 0; |
---|
| 865 | } // end if PTE2 mapped |
---|
| 866 | } // end if PTE1 mapped |
---|
| 867 | |
---|
| 868 | // return "nothing done" |
---|
| 869 | *mapped = false; |
---|
| 870 | *ppn = 0; |
---|
[432] | 871 | |
---|
[438] | 872 | #if DEBUG_GPT_ACCESS |
---|
[432] | 873 | cycle = (uint32_t)hal_get_cycles; |
---|
[438] | 874 | if( DEBUG_GPT_ACCESS < cycle ) |
---|
[432] | 875 | printk("\n[DBG] %s : thread %x exit / nothing done for vpn %x / cycle %d\n", |
---|
| 876 | __FUNCTION__, CURRENT_THREAD, vpn, cycle ); |
---|
| 877 | #endif |
---|
[408] | 878 | |
---|
[407] | 879 | hal_fence(); |
---|
| 880 | |
---|
| 881 | return 0; |
---|
| 882 | |
---|
[408] | 883 | } // end hal_gpt_pte_copy() |
---|
[407] | 884 | |
---|
[408] | 885 | ////////////////////////////////////////// |
---|
| 886 | bool_t hal_gpt_pte_is_mapped( gpt_t * gpt, |
---|
| 887 | vpn_t vpn ) |
---|
| 888 | { |
---|
| 889 | uint32_t * pt1; |
---|
| 890 | uint32_t pte1; |
---|
| 891 | uint32_t pte2_attr; |
---|
| 892 | |
---|
| 893 | uint32_t * pt2; |
---|
| 894 | ppn_t pt2_ppn; |
---|
| 895 | |
---|
| 896 | uint32_t ix1 = TSAR_MMU_IX1_FROM_VPN( vpn ); |
---|
| 897 | uint32_t ix2 = TSAR_MMU_IX2_FROM_VPN( vpn ); |
---|
| 898 | |
---|
| 899 | // get PTE1 value |
---|
| 900 | pt1 = gpt->ptr; |
---|
| 901 | pte1 = pt1[ix1]; |
---|
| 902 | |
---|
| 903 | if( (pte1 & TSAR_MMU_MAPPED) == 0 ) return false; |
---|
| 904 | |
---|
| 905 | if( (pte1 & TSAR_MMU_SMALL) == 0 ) return false; |
---|
| 906 | |
---|
| 907 | // compute PT2 base address |
---|
| 908 | pt2_ppn = TSAR_MMU_PTBA_FROM_PTE1( pte1 ); |
---|
| 909 | pt2 = (uint32_t*)GET_PTR( ppm_ppn2base( pt2_ppn ) ); |
---|
| 910 | |
---|
| 911 | // get pte2_attr |
---|
| 912 | pte2_attr = pt2[2*ix2]; |
---|
| 913 | |
---|
| 914 | if( (pte2_attr & TSAR_MMU_MAPPED) == 0 ) return false; |
---|
| 915 | else return true; |
---|
| 916 | |
---|
| 917 | } // end hal_gpt_pte_is_mapped() |
---|
| 918 | |
---|
[407] | 919 | /////////////////////////////////////// |
---|
| 920 | bool_t hal_gpt_pte_is_cow( gpt_t * gpt, |
---|
| 921 | vpn_t vpn ) |
---|
| 922 | { |
---|
| 923 | uint32_t * pt1; |
---|
| 924 | uint32_t pte1; |
---|
[408] | 925 | uint32_t pte2_attr; |
---|
[407] | 926 | |
---|
| 927 | uint32_t * pt2; |
---|
| 928 | ppn_t pt2_ppn; |
---|
| 929 | |
---|
| 930 | uint32_t ix1 = TSAR_MMU_IX1_FROM_VPN( vpn ); |
---|
| 931 | uint32_t ix2 = TSAR_MMU_IX2_FROM_VPN( vpn ); |
---|
| 932 | |
---|
| 933 | // get PTE1 value |
---|
| 934 | pt1 = gpt->ptr; |
---|
| 935 | pte1 = pt1[ix1]; |
---|
| 936 | |
---|
[408] | 937 | if( (pte1 & TSAR_MMU_MAPPED) == 0 ) return false; |
---|
[407] | 938 | |
---|
[408] | 939 | if( (pte1 & TSAR_MMU_SMALL) == 0 ) return false; |
---|
[407] | 940 | |
---|
[408] | 941 | // compute PT2 base address |
---|
| 942 | pt2_ppn = TSAR_MMU_PTBA_FROM_PTE1( pte1 ); |
---|
| 943 | pt2 = (uint32_t*)GET_PTR( ppm_ppn2base( pt2_ppn ) ); |
---|
| 944 | |
---|
| 945 | // get pte2_attr |
---|
| 946 | pte2_attr = pt2[2*ix2]; |
---|
| 947 | |
---|
| 948 | if( (pte2_attr & TSAR_MMU_MAPPED) == 0 ) return false; |
---|
| 949 | |
---|
| 950 | if( (pte2_attr & TSAR_MMU_COW) == 0 ) return false; |
---|
| 951 | else return true; |
---|
| 952 | |
---|
[407] | 953 | } // end hal_gpt_pte_is_cow() |
---|
| 954 | |
---|
[408] | 955 | ///////////////////////////////////////// |
---|
[432] | 956 | void hal_gpt_set_cow( xptr_t gpt_xp, |
---|
| 957 | vpn_t vpn_base, |
---|
| 958 | vpn_t vpn_size ) |
---|
[408] | 959 | { |
---|
| 960 | cxy_t gpt_cxy; |
---|
| 961 | gpt_t * gpt_ptr; |
---|
[407] | 962 | |
---|
[408] | 963 | vpn_t vpn; |
---|
[407] | 964 | |
---|
[408] | 965 | uint32_t ix1; |
---|
| 966 | uint32_t ix2; |
---|
[407] | 967 | |
---|
[408] | 968 | uint32_t * pt1; |
---|
| 969 | uint32_t pte1; |
---|
[407] | 970 | |
---|
[408] | 971 | uint32_t * pt2; |
---|
| 972 | ppn_t pt2_ppn; |
---|
[432] | 973 | uint32_t attr; |
---|
[407] | 974 | |
---|
[408] | 975 | // get GPT cluster and local pointer |
---|
| 976 | gpt_cxy = GET_CXY( gpt_xp ); |
---|
| 977 | gpt_ptr = (gpt_t *)GET_PTR( gpt_xp ); |
---|
[407] | 978 | |
---|
[408] | 979 | // get local PT1 pointer |
---|
| 980 | pt1 = (uint32_t *)hal_remote_lpt( XPTR( gpt_cxy , &gpt_ptr->ptr ) ); |
---|
[407] | 981 | |
---|
[408] | 982 | // loop on pages |
---|
| 983 | for( vpn = vpn_base ; vpn < (vpn_base + vpn_size) ; vpn++ ) |
---|
| 984 | { |
---|
| 985 | ix1 = TSAR_MMU_IX1_FROM_VPN( vpn ); |
---|
| 986 | ix2 = TSAR_MMU_IX2_FROM_VPN( vpn ); |
---|
[407] | 987 | |
---|
[408] | 988 | // get PTE1 value |
---|
| 989 | pte1 = hal_remote_lw( XPTR( gpt_cxy , &pt1[ix1] ) ); |
---|
[407] | 990 | |
---|
[408] | 991 | // only MAPPED & SMALL PTEs are modified |
---|
| 992 | if( (pte1 & TSAR_MMU_MAPPED) && (pte1 & TSAR_MMU_SMALL) ) |
---|
| 993 | { |
---|
| 994 | // compute PT2 base address |
---|
| 995 | pt2_ppn = TSAR_MMU_PTBA_FROM_PTE1( pte1 ); |
---|
| 996 | pt2 = (uint32_t*)GET_PTR( ppm_ppn2base( pt2_ppn ) ); |
---|
[407] | 997 | |
---|
[408] | 998 | assert( (GET_CXY( ppm_ppn2base( pt2_ppn ) ) == gpt_cxy ), __FUNCTION__, |
---|
| 999 | "PT2 and PT1 must be in the same cluster\n"); |
---|
| 1000 | |
---|
| 1001 | // get current PTE2 attributes |
---|
[432] | 1002 | attr = hal_remote_lw( XPTR( gpt_cxy , &pt2[2*ix2] ) ); |
---|
[408] | 1003 | |
---|
| 1004 | // only MAPPED PTEs are modified |
---|
[432] | 1005 | if( attr & TSAR_MMU_MAPPED ) |
---|
[23] | 1006 | { |
---|
[432] | 1007 | attr = (attr | TSAR_MMU_COW) & (~TSAR_MMU_WRITABLE); |
---|
| 1008 | hal_remote_sw( XPTR( gpt_cxy , &pt2[2*ix2] ) , attr ); |
---|
| 1009 | } |
---|
| 1010 | } |
---|
[408] | 1011 | } // end loop on pages |
---|
[23] | 1012 | |
---|
[432] | 1013 | } // end hal_gpt_set_cow() |
---|
[315] | 1014 | |
---|
[408] | 1015 | ////////////////////////////////////////// |
---|
| 1016 | void hal_gpt_update_pte( xptr_t gpt_xp, |
---|
| 1017 | vpn_t vpn, |
---|
| 1018 | uint32_t attr, // generic GPT attributes |
---|
| 1019 | ppn_t ppn ) |
---|
| 1020 | { |
---|
| 1021 | uint32_t * pt1; // PT1 base addres |
---|
| 1022 | uint32_t pte1; // PT1 entry value |
---|
[23] | 1023 | |
---|
[408] | 1024 | ppn_t pt2_ppn; // PPN of PT2 |
---|
| 1025 | uint32_t * pt2; // PT2 base address |
---|
[23] | 1026 | |
---|
[408] | 1027 | uint32_t ix1; // index in PT1 |
---|
| 1028 | uint32_t ix2; // index in PT2 |
---|
[23] | 1029 | |
---|
[408] | 1030 | uint32_t tsar_attr; // PTE attributes for TSAR MMU |
---|
[23] | 1031 | |
---|
[408] | 1032 | // check attr argument MAPPED and SMALL |
---|
| 1033 | if( (attr & GPT_MAPPED) == 0 ) return; |
---|
| 1034 | if( (attr & GPT_SMALL ) == 0 ) return; |
---|
[23] | 1035 | |
---|
[408] | 1036 | // get cluster and local pointer on remote GPT |
---|
| 1037 | cxy_t gpt_cxy = GET_CXY( gpt_xp ); |
---|
| 1038 | gpt_t * gpt_ptr = (gpt_t *)GET_PTR( gpt_xp ); |
---|
[23] | 1039 | |
---|
[408] | 1040 | // compute indexes in PT1 and PT2 |
---|
| 1041 | ix1 = TSAR_MMU_IX1_FROM_VPN( vpn ); |
---|
| 1042 | ix2 = TSAR_MMU_IX2_FROM_VPN( vpn ); |
---|
[23] | 1043 | |
---|
[408] | 1044 | // get PT1 base |
---|
| 1045 | pt1 = (uint32_t *)hal_remote_lpt( XPTR( gpt_cxy , &gpt_ptr->ptr ) ); |
---|
[23] | 1046 | |
---|
[408] | 1047 | // compute tsar_attr from generic attributes |
---|
| 1048 | tsar_attr = gpt2tsar( attr ); |
---|
[23] | 1049 | |
---|
[408] | 1050 | // get PTE1 value |
---|
| 1051 | pte1 = hal_remote_lw( XPTR( gpt_cxy , &pt1[ix1] ) ); |
---|
[23] | 1052 | |
---|
[408] | 1053 | if( (pte1 & TSAR_MMU_MAPPED) == 0 ) return; |
---|
| 1054 | if( (pte1 & TSAR_MMU_SMALL ) == 0 ) return; |
---|
| 1055 | |
---|
| 1056 | // get PT2 base from PTE1 |
---|
| 1057 | pt2_ppn = TSAR_MMU_PTBA_FROM_PTE1( pte1 ); |
---|
| 1058 | pt2 = (uint32_t *)GET_PTR( ppm_ppn2base( pt2_ppn ) ); |
---|
| 1059 | |
---|
| 1060 | // reset PTE2 |
---|
| 1061 | hal_remote_sw( XPTR( gpt_cxy, &pt2[2 * ix2] ) , 0 ); |
---|
| 1062 | hal_fence(); |
---|
| 1063 | |
---|
| 1064 | // set PTE2 in this order |
---|
| 1065 | hal_remote_sw( XPTR( gpt_cxy, &pt2[2 * ix2 + 1] ) , ppn ); |
---|
| 1066 | hal_fence(); |
---|
| 1067 | hal_remote_sw( XPTR( gpt_cxy, &pt2[2 * ix2] ) , tsar_attr ); |
---|
| 1068 | hal_fence(); |
---|
| 1069 | |
---|
| 1070 | } // end hal_gpt_update_pte() |
---|
| 1071 | |
---|