1 | /* |
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2 | * hal_vmm.c - Virtual Memory Manager Initialisation for TSAR |
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3 | * |
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4 | * Authors Alain Greiner (2016,2017,2018,2019) |
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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 <kernel_config.h> |
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25 | #include <hal_kernel_types.h> |
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26 | #include <hal_vmm.h> |
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27 | #include <hal_gpt.h> |
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28 | #include <process.h> |
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29 | #include <vseg.h> |
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30 | #include <xlist.h> |
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31 | #include <vmm.h> |
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32 | #include <remote_rwlock.h> |
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33 | |
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34 | ////////////////////////////////////////////////////////////////////////////////////////// |
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35 | // This file contains the TSAR specific code used to initialize the kernel process VMM, |
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36 | // or to update an user process VMM with informations related to the kernel vsegs. |
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37 | // As the TSAR architure does not use the DATA MMU, but use only the DATA extension |
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38 | // address register to access local and remote kernel data, the kernel VSL contains only |
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39 | // one "kcode" segment, and the kernel GPT contains only one big page in PT1[0] slot. |
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40 | ////////////////////////////////////////////////////////////////////////////////////////// |
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41 | |
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42 | // extern global variables |
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43 | extern process_t process_zero; |
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44 | |
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45 | ////////////////////////////////////////////////////////////////////////////////////////// |
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46 | // This function is called by the process_zero_init() function during kernel_init. |
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47 | // It initializes the VMM of the kernel proces_zero (containing all kernel threads) |
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48 | // in the local cluster. |
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49 | ////////////////////////////////////////////////////////////////////////////////////////// |
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50 | error_t hal_vmm_kernel_init( boot_info_t * info ) |
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51 | { |
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52 | error_t error; |
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53 | |
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54 | // get pointer on kernel GPT |
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55 | gpt_t * gpt = &process_zero.vmm.gpt; |
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56 | |
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57 | // get cluster identifier |
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58 | cxy_t cxy = local_cxy; |
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59 | |
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60 | // allocate memory for kernel GPT |
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61 | error = hal_gpt_create( gpt ); |
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62 | |
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63 | if( error ) |
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64 | { |
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65 | printk("\n[PANIC] in %s : cannot allocate kernel GPT in cluster %x\n", |
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66 | __FUNCTION__ , cxy ); |
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67 | hal_core_sleep(); |
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68 | } |
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69 | |
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70 | // compute attr and ppn for one PTE1 |
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71 | uint32_t attr = 0x8A800000; // bits : V,C,X,G |
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72 | uint32_t ppn = (cxy << 20) >> 9; // physical page index is 0 |
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73 | |
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74 | // set PTE1 in slot[0] |
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75 | error = hal_gpt_set_pte( XPTR( cxy , gpt ) , 0 , attr , ppn ); |
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76 | |
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77 | if( error ) |
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78 | { |
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79 | printk("\n[PANIC] in %s : cannot initialize kernel GPT in cluster %x\n", |
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80 | __FUNCTION__ , cxy ); |
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81 | hal_core_sleep(); |
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82 | } |
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83 | |
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84 | // create kcode vseg and register it in kernel VSL |
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85 | vseg_t * vseg = vmm_create_vseg( &process_zero, |
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86 | VSEG_TYPE_CODE, |
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87 | info->kcode_base, |
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88 | info->kcode_size, |
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89 | 0, 0, // file ofset and file size (unused) |
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90 | XPTR_NULL, // no mapper |
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91 | local_cxy ); |
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92 | if( vseg == NULL ) |
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93 | { |
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94 | printk("\n[PANIC] in %s : cannot register vseg to VSL in cluster %x\n", |
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95 | __FUNCTION__ , cxy ); |
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96 | hal_core_sleep(); |
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97 | } |
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98 | |
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99 | } // end hal_vmm_init() |
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100 | |
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101 | ////////////////////////////////////////////////////////////////////////////////////////// |
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102 | // This function is called by the vmm_init() function to update the VMM of an user |
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103 | // process identified by the <process> argument. |
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104 | // It registers in the user VSL the "kcode" vseg, registered in the local kernel VSL, |
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105 | // and register in the user GPT the big page[0] mapped in the local kernel GPT. |
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106 | ////////////////////////////////////////////////////////////////////////////////////////// |
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107 | error_t hal_vmm_kernel_update( process_t * process ) |
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108 | { |
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109 | error_t error; |
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110 | uint32_t attr; |
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111 | uint32_t ppn; |
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112 | |
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113 | // TODO check ppn value in kernel GPT (must be 0) |
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114 | |
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115 | // get cluster identifier |
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116 | cxy_t cxy = local_cxy; |
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117 | |
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118 | // get extended pointer on user GPT |
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119 | xptr_t gpt_xp = XPTR( cxy , &process->vmm.gpt ); |
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120 | |
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121 | // get ppn and attributes from slot[0] in kernel GPT |
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122 | hal_gpt_get_pte( gpt_xp , 0 , &attr , &ppn ); |
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123 | |
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124 | // check ppn and attributes |
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125 | assert( (attr == 0x8A800000) && (ppn == ((cxy << 20) >> 9)), __FUNCTION__, |
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126 | "bad ppn = %x or attr = %x in slot[0] of kernel GPT\n", ppn , attr ); |
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127 | |
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128 | // update user GPT : set PTE1 in slot[0] |
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129 | error = hal_gpt_set_pte( gpt_xp , 0 , attr , ppn ); |
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130 | |
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131 | if( error ) |
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132 | { |
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133 | printk("\n[ERROR] in %s : cannot update GPT in cluster %x\n", |
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134 | __FUNCTION__ , cxy ); |
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135 | return -1; |
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136 | } |
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137 | |
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138 | // get pointer on the unique vseg registered in kernel VSL |
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139 | xptr_t root_xp = XPTR( cxy , &process_zero.vmm.vsegs_root ); |
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140 | vseg_t * vseg = XLIST_FIRST( root_xp , vseg_t , xlist ); |
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141 | |
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142 | // check vsegs_nr |
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143 | assert( (process_zero.vmm.vsegs_nr == 1 ) , __FUNCTION__, |
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144 | "bad vsegs number in kernel VSL\n" ); |
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145 | |
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146 | // update user VSL : register one new vseg for kcode |
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147 | vseg_t * new = vmm_create_vseg( process, |
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148 | vseg->type, |
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149 | vseg->min, |
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150 | vseg->max - vseg->min, |
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151 | 0, 0, // file ofset and file size (unused) |
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152 | XPTR_NULL, // no mapper |
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153 | local_cxy ); |
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154 | if( new == NULL ) |
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155 | { |
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156 | printk("\n[ERROR] in %s : cannot update VSL in cluster %x\n", |
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157 | __FUNCTION__ , cxy ); |
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158 | return -1; |
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159 | } |
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160 | } |
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161 | |
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162 | |
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