[1] | 1 | /* |
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| 2 | * hal_uspace.c - implementation of Generic User Space Access API for MIPS32 |
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| 3 | * |
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| 4 | * Author Mohamed Karaoui (2015) |
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| 5 | * Alain Greiner (2016) |
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| 6 | * |
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| 7 | * Copyright (c) UPMC Sorbonne Universites |
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| 8 | * |
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| 9 | * This file is part of ALMOS-MKH.. |
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| 10 | * |
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| 11 | * ALMOS-MKH. is free software; you can redistribute it and/or modify it |
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| 12 | * under the terms of the GNU General Public License as published by |
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| 13 | * the Free Software Foundation; version 2.0 of the License. |
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| 14 | * |
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| 15 | * ALMOS-MKH. is distributed in the hope that it will be useful, but |
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| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 18 | * General Public License for more details. |
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| 19 | * |
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| 20 | * You should have received a copy of the GNU General Public License |
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| 21 | * along with ALMOS-MKH.; if not, write to the Free Software Foundation, |
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| 22 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 23 | */ |
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| 24 | |
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[315] | 25 | #include <errno.h> |
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| 26 | #include <vmm.h> |
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[1] | 27 | #include <hal_types.h> |
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| 28 | #include <hal_uspace.h> |
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| 29 | #include <hal_irqmask.h> |
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| 30 | |
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| 31 | /////////////////////////////////////////// |
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| 32 | void hal_copy_from_uspace( void * k_dst, |
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| 33 | void * u_src, |
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| 34 | uint32_t size ) |
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| 35 | { |
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| 36 | uint32_t save_sr; |
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| 37 | uint32_t i; |
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| 38 | uint32_t wsize; // number of words |
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| 39 | uint32_t src = (uint32_t)u_src; |
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| 40 | uint32_t dst = (uint32_t)k_dst; |
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| 41 | |
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| 42 | if( (dst & 0x3) || (src & 0x3) ) wsize = 0; // do it all in bytes |
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| 43 | else wsize = size >> 2; |
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| 44 | |
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| 45 | hal_disable_irq( &save_sr ); |
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| 46 | |
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| 47 | for( i = 0 ; i < wsize ; i++ ) // transfer one word per iteration |
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| 48 | { |
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| 49 | asm volatile( |
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| 50 | "mfc2 $15, $1 \n" /* save MMU_MODE */ |
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| 51 | "ori $14, $0, 0x7 \n" |
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| 52 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
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| 53 | "lw $13, 0(%0) \n" /* read data from user space */ |
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[87] | 54 | "mtc2 $15, $1 \n" /* restore MMU_MODE */ |
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[1] | 55 | "sw $13, 0(%1) \n" /* store data to kernel space */ |
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| 56 | : : "r"( src ) , "r"( dst ) : "$13","$14","$15", "memory" ); |
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| 57 | |
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| 58 | src += 4; |
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| 59 | dst += 4; |
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| 60 | } |
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| 61 | |
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| 62 | for( i = wsize << 2 ; i < size ; i++ ) // transfer one byte per iteration |
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| 63 | { |
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| 64 | asm volatile( |
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| 65 | "mfc2 $15, $1 \n" /* save MMU_MODE */ |
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| 66 | "ori $14, $0, 0x7 \n" |
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| 67 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
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| 68 | "lb $13, 0(%0) \n" /* read data from user space */ |
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[87] | 69 | "mtc2 $15, $1 \n" /* restore MMU_MODE */ |
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[1] | 70 | "sb $13, 0(%1) \n" /* store data to kernel space */ |
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| 71 | : : "r"( src ) , "r"( dst ) : "$13","$14","$15", "memory" ); |
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| 72 | |
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| 73 | src += 1; |
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| 74 | dst += 1; |
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| 75 | } |
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| 76 | |
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| 77 | hal_restore_irq( save_sr ); |
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| 78 | |
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[87] | 79 | } // end hal_copy_from_uspace() |
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| 80 | |
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[1] | 81 | /////////////////////////////////////////// |
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| 82 | void hal_copy_to_uspace( void * u_dst, |
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| 83 | void * k_src, |
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| 84 | uint32_t size ) |
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| 85 | { |
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| 86 | uint32_t save_sr; |
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| 87 | uint32_t i; |
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[87] | 88 | uint32_t wsize; // number of words if aligned |
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[1] | 89 | uint32_t src = (uint32_t)k_src; |
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| 90 | uint32_t dst = (uint32_t)u_dst; |
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| 91 | |
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[87] | 92 | if( (dst & 0x3) || (src & 0x3) ) wsize = 0; // not aligned |
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[1] | 93 | else wsize = size >> 2; |
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| 94 | |
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| 95 | hal_disable_irq( &save_sr ); |
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| 96 | |
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| 97 | for( i = 0 ; i < wsize ; i++ ) // transfer one word per iteration |
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| 98 | { |
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| 99 | asm volatile( |
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| 100 | "mfc2 $15, $1 \n" /* save MMU_MODE */ |
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| 101 | "lw $13, 0(%0) \n" /* read data from kernel space */ |
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| 102 | "ori $14, $0, 0x7 \n" |
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| 103 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
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| 104 | "sw $13, 0(%1) \n" /* store data to user space */ |
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[87] | 105 | "mtc2 $15, $1 \n" /* restore MMU_MODE */ |
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[1] | 106 | : : "r"( src ) , "r"( dst ) : "$13","$14","$15", "memory" ); |
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| 107 | |
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| 108 | src += 4; |
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| 109 | dst += 4; |
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| 110 | } |
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| 111 | |
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| 112 | for( i = wsize << 2 ; i < size ; i++ ) // transfer one byte per iteration |
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| 113 | { |
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| 114 | asm volatile( |
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| 115 | "mfc2 $15, $1 \n" /* save MMU_MODE */ |
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| 116 | "lw $13, 0(%0) \n" /* read data from kernel space */ |
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| 117 | "ori $14, $0, 0x7 \n" |
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| 118 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
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| 119 | "sb $13, 0(%1) \n" /* store data to user space */ |
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[87] | 120 | "mtc2 $15, $1 \n" /* restore MMU_MODE */ |
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[1] | 121 | : : "r"( src ) , "r"( dst ) : "$13","$14","$15", "memory" ); |
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| 122 | |
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| 123 | src += 1; |
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| 124 | dst += 1; |
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| 125 | } |
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| 126 | |
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| 127 | hal_restore_irq( save_sr ); |
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| 128 | |
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[87] | 129 | } // end hal_copy_to_uspace() |
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| 130 | |
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| 131 | ////////////////////////////////////////// |
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[299] | 132 | error_t hal_strcpy_from_uspace( char * k_dst, |
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| 133 | char * u_src, |
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| 134 | uint32_t max_size ) |
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[87] | 135 | |
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| 136 | { |
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[121] | 137 | |
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[299] | 138 | // TODO implement the max_size handling, and error handling |
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[121] | 139 | |
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[87] | 140 | uint32_t save_sr; |
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| 141 | uint32_t src = (uint32_t)u_src; |
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| 142 | uint32_t dst = (uint32_t)k_dst; |
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[300] | 143 | uint32_t length; |
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| 144 | error_t error; |
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| 145 | paddr_t paddr; |
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[87] | 146 | |
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[300] | 147 | // XXX XXX XXX: must be converted, to handle faults |
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| 148 | error = vmm_v2p_translate( false , u_src , &paddr ); |
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| 149 | if( error ) |
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| 150 | { |
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| 151 | return EFAULT; |
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| 152 | } |
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[315] | 153 | |
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[300] | 154 | length = hal_strlen_from_uspace( u_src ); |
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| 155 | if( length >= max_size ) |
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| 156 | { |
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| 157 | return EFAULT; |
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| 158 | } |
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| 159 | |
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[87] | 160 | hal_disable_irq( &save_sr ); |
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| 161 | |
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| 162 | // loop on characters while non NUL |
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| 163 | asm volatile( |
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| 164 | "mfc2 $15, $1 \n" /* save current MMU_MODE */ |
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| 165 | "1: \n" /* loop entry */ |
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| 166 | "ori $14, $0, 0x7 \n" |
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| 167 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
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| 168 | "lb $13, 0(%0) \n" /* read char from user space */ |
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| 169 | "mtc2 $15, $1 \n" /* restore MMU_MODE */ |
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| 170 | "sb $13, 0(%1) \n" /* store char to kernel space */ |
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| 171 | "addi %0, %0, 1 \n" /* increment SRC pointer */ |
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| 172 | "addi %1, %1, 1 \n" /* increment DST pointer */ |
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| 173 | "bne $13, $0, 1b \n" /* test NUL */ |
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| 174 | "nop \n" |
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| 175 | : : "r"( src ) , "r"( dst ) : "$13","$14","$15", "memory" ); |
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| 176 | |
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| 177 | hal_restore_irq( save_sr ); |
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| 178 | |
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[299] | 179 | return 0; |
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[87] | 180 | } // hal_strcpy_from_uspace() |
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| 181 | |
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[121] | 182 | //////////////////////////////////////////// |
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[299] | 183 | error_t hal_strcpy_to_uspace( char * u_dst, |
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| 184 | char * k_src, |
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| 185 | uint32_t max_size ) |
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[121] | 186 | { |
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[87] | 187 | |
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[299] | 188 | // TODO implement the max_size handling, and error handling |
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[121] | 189 | |
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[87] | 190 | uint32_t save_sr; |
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| 191 | uint32_t src = (uint32_t)k_src; |
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| 192 | uint32_t dst = (uint32_t)u_dst; |
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| 193 | |
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| 194 | hal_disable_irq( &save_sr ); |
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| 195 | |
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| 196 | // loop on characters while non NUL |
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| 197 | asm volatile( |
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| 198 | "mfc2 $15, $1 \n" /* save current MMU_MODE */ |
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| 199 | "1: \n" /* loop entry */ |
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| 200 | "lb $13, 0(%0) \n" /* read char from kernel space */ |
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| 201 | "ori $14, $0, 0x7 \n" |
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| 202 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
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| 203 | "sb $13, 0(%1) \n" /* store char to user space */ |
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| 204 | "mtc2 $15, $1 \n" /* restore MMU_MODE */ |
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| 205 | "addi %0, %0, 1 \n" /* increment SRC pointer */ |
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| 206 | "addi %1, %1, 1 \n" /* increment DST pointer */ |
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| 207 | "bne $13, $0, 1b \n" /* test NUL */ |
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| 208 | "nop \n" |
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| 209 | : : "r"( src ) , "r"( dst ) : "$13","$14","$15", "memory" ); |
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| 210 | |
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| 211 | hal_restore_irq( save_sr ); |
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| 212 | |
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[299] | 213 | return 0; |
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| 214 | } // hal_strcpy_to_uspace() |
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[87] | 215 | |
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[1] | 216 | /////////////////////////////////////////////// |
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| 217 | uint32_t hal_strlen_from_uspace( char * u_str ) |
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| 218 | { |
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| 219 | uint32_t save_sr; |
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| 220 | uint32_t str = (uint32_t)u_str; |
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| 221 | uint32_t count = 0; |
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| 222 | |
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| 223 | hal_disable_irq( &save_sr ); |
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| 224 | |
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| 225 | asm volatile( |
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| 226 | "ori $15, %0, 0 \n" /* $15 <= count */ |
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| 227 | "ori $13, %1, 0 \n" /* $13 <= str */ |
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| 228 | |
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| 229 | "mfc2 $15, $1 \n" /* save MMU_MODE */ |
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| 230 | "ori $14, $0, 0x7 \n" /* $14 <= mode DTLB on */ |
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| 231 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
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| 232 | |
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| 233 | "1: \n" |
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[87] | 234 | "lb $13, 0(%0) \n" /* read char from kernel space */ |
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[1] | 235 | "addi $13, $13, 1 \n" /* increment address */ |
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| 236 | "bne $13, $0, 1b \n" /* loop until NUL found */ |
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| 237 | "addi $15, $15, 1 \n" /* increment counter */ |
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| 238 | |
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| 239 | "mtc2 $14, $1 \n" /* restore MMU_MODE */ |
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| 240 | : "+r"(count) : "r"(str) : "$13","$14","$15" ); |
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| 241 | |
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| 242 | hal_restore_irq( save_sr ); |
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| 243 | |
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| 244 | return count; |
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| 245 | } |
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| 246 | |
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