[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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[407] | 47 | |
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[1] | 48 | for( i = 0 ; i < wsize ; i++ ) // transfer one word per iteration |
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| 49 | { |
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| 50 | asm volatile( |
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| 51 | "mfc2 $15, $1 \n" /* save MMU_MODE */ |
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| 52 | "ori $14, $0, 0x7 \n" |
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| 53 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
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| 54 | "lw $13, 0(%0) \n" /* read data from user space */ |
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[87] | 55 | "mtc2 $15, $1 \n" /* restore MMU_MODE */ |
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[1] | 56 | "sw $13, 0(%1) \n" /* store data to kernel space */ |
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| 57 | : : "r"( src ) , "r"( dst ) : "$13","$14","$15", "memory" ); |
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| 58 | |
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| 59 | src += 4; |
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| 60 | dst += 4; |
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| 61 | } |
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| 62 | |
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| 63 | for( i = wsize << 2 ; i < size ; i++ ) // transfer one byte per iteration |
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| 64 | { |
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| 65 | asm volatile( |
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| 66 | "mfc2 $15, $1 \n" /* save MMU_MODE */ |
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| 67 | "ori $14, $0, 0x7 \n" |
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| 68 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
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| 69 | "lb $13, 0(%0) \n" /* read data from user space */ |
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[87] | 70 | "mtc2 $15, $1 \n" /* restore MMU_MODE */ |
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[1] | 71 | "sb $13, 0(%1) \n" /* store data to kernel space */ |
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| 72 | : : "r"( src ) , "r"( dst ) : "$13","$14","$15", "memory" ); |
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| 73 | |
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| 74 | src += 1; |
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| 75 | dst += 1; |
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| 76 | } |
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| 77 | |
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| 78 | hal_restore_irq( save_sr ); |
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| 79 | |
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[87] | 80 | } // end hal_copy_from_uspace() |
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| 81 | |
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[1] | 82 | /////////////////////////////////////////// |
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| 83 | void hal_copy_to_uspace( void * u_dst, |
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| 84 | void * k_src, |
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| 85 | uint32_t size ) |
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| 86 | { |
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| 87 | uint32_t save_sr; |
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| 88 | uint32_t i; |
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[87] | 89 | uint32_t wsize; // number of words if aligned |
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[1] | 90 | uint32_t src = (uint32_t)k_src; |
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| 91 | uint32_t dst = (uint32_t)u_dst; |
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| 92 | |
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[87] | 93 | if( (dst & 0x3) || (src & 0x3) ) wsize = 0; // not aligned |
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[1] | 94 | else wsize = size >> 2; |
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| 95 | |
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| 96 | hal_disable_irq( &save_sr ); |
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| 97 | |
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| 98 | for( i = 0 ; i < wsize ; i++ ) // transfer one word per iteration |
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| 99 | { |
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| 100 | asm volatile( |
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| 101 | "mfc2 $15, $1 \n" /* save MMU_MODE */ |
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| 102 | "lw $13, 0(%0) \n" /* read data from kernel space */ |
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| 103 | "ori $14, $0, 0x7 \n" |
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| 104 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
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| 105 | "sw $13, 0(%1) \n" /* store data to user space */ |
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[87] | 106 | "mtc2 $15, $1 \n" /* restore MMU_MODE */ |
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[1] | 107 | : : "r"( src ) , "r"( dst ) : "$13","$14","$15", "memory" ); |
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| 108 | |
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| 109 | src += 4; |
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| 110 | dst += 4; |
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| 111 | } |
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| 112 | |
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| 113 | for( i = wsize << 2 ; i < size ; i++ ) // transfer one byte per iteration |
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| 114 | { |
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| 115 | asm volatile( |
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| 116 | "mfc2 $15, $1 \n" /* save MMU_MODE */ |
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| 117 | "lw $13, 0(%0) \n" /* read data from kernel space */ |
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| 118 | "ori $14, $0, 0x7 \n" |
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| 119 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
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| 120 | "sb $13, 0(%1) \n" /* store data to user space */ |
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[87] | 121 | "mtc2 $15, $1 \n" /* restore MMU_MODE */ |
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[1] | 122 | : : "r"( src ) , "r"( dst ) : "$13","$14","$15", "memory" ); |
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| 123 | |
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| 124 | src += 1; |
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| 125 | dst += 1; |
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| 126 | } |
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| 127 | |
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| 128 | hal_restore_irq( save_sr ); |
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| 129 | |
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[87] | 130 | } // end hal_copy_to_uspace() |
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| 131 | |
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[407] | 132 | ////////////////////////////////////////////// |
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| 133 | void hal_strcpy_from_uspace( char * k_dst, |
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| 134 | char * u_src, |
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| 135 | uint32_t size ) |
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[87] | 136 | { |
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[407] | 137 | uint32_t save_sr; |
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[121] | 138 | |
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[87] | 139 | uint32_t src = (uint32_t)u_src; |
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| 140 | uint32_t dst = (uint32_t)k_dst; |
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| 141 | |
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| 142 | hal_disable_irq( &save_sr ); |
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| 143 | |
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[407] | 144 | // loop on characters while ( (character != NUL) and (count < size ) |
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[87] | 145 | asm volatile( |
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[407] | 146 | ".set noreorder \n" |
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| 147 | "move $11, %0 \n" /* $11 <= count == size */ |
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| 148 | "move $12, %1 \n" /* $12 <= u_src */ |
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| 149 | "move $13, %2 \n" /* $13 <= k_dst */ |
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| 150 | "mfc2 $15, $1 \n" /* $15 <= MMU_MODE */ |
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| 151 | "ori $14, $15, 0x7 \n" /* $14 <= mode DTLB on */ |
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| 152 | "1: \n" |
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[87] | 153 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
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[407] | 154 | "lb $10, 0($12) \n" /* read char from user space */ |
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[87] | 155 | "mtc2 $15, $1 \n" /* restore MMU_MODE */ |
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[407] | 156 | "sb $10, 0($13) \n" /* store char to kernel space */ |
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| 157 | "beq $13, $0, 2f \n" /* exit if char = 0 */ |
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| 158 | "addi $11, $11, -1 \n" /* decrement count */ |
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| 159 | "addi $12, $12, 1 \n" /* increment u_src pointer */ |
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| 160 | "beq $11, $0, 2f \n" /* exit if count == 0 */ |
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| 161 | "addi $13, $13, 1 \n" /* increment k_src pointer */ |
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| 162 | "j 1b \n" /* jump to next iteration */ |
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| 163 | "2: \n" |
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[87] | 164 | "nop \n" |
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[407] | 165 | ".set reorder \n" |
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| 166 | : |
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| 167 | : "r"(size),"r"(src),"r"(dst) |
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| 168 | : "$10","$11","$12","$13","$14","$15" ); |
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| 169 | |
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| 170 | hal_restore_irq( save_sr ); |
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[87] | 171 | |
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| 172 | } // hal_strcpy_from_uspace() |
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| 173 | |
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[121] | 174 | //////////////////////////////////////////// |
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[407] | 175 | void hal_strcpy_to_uspace( char * u_dst, |
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| 176 | char * k_src, |
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| 177 | uint32_t size ) |
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[121] | 178 | { |
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[407] | 179 | uint32_t save_sr; |
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[87] | 180 | |
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| 181 | uint32_t src = (uint32_t)k_src; |
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| 182 | uint32_t dst = (uint32_t)u_dst; |
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| 183 | |
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| 184 | hal_disable_irq( &save_sr ); |
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| 185 | |
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[407] | 186 | // loop on characters while ( (character != NUL) and (count < size) ) |
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[87] | 187 | asm volatile( |
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[407] | 188 | ".set noreorder \n" |
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| 189 | "move $11, %0 \n" /* $11 <= count == size */ |
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| 190 | "move $12, %1 \n" /* $12 <= k_src */ |
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| 191 | "move $13, %2 \n" /* $13 <= u_dst */ |
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| 192 | "mfc2 $15, $1 \n" /* $15 <= MMU_MODE */ |
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| 193 | "ori $14, $15, 0x7 \n" /* $14 <= mode DTLB on */ |
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| 194 | "1: \n" |
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| 195 | "lb $10, 0($12) \n" /* read char from kernel space */ |
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[87] | 196 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
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[407] | 197 | "sb $10, 0($13) \n" /* store char to user space */ |
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[87] | 198 | "mtc2 $15, $1 \n" /* restore MMU_MODE */ |
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[407] | 199 | "beq $13, $0, 2f \n" /* exit if char == 0 */ |
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| 200 | "addi $11, $11, -1 \n" /* decrement count */ |
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| 201 | "addi $12, $12, 1 \n" /* increment k_src pointer */ |
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| 202 | "beq $11, $0, 2f \n" /* exit if count == size */ |
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| 203 | "addi $13, $13, 1 \n" /* increment u_src pointer */ |
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| 204 | "j 1b \n" /* jump to next iteration */ |
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| 205 | "2: \n" |
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[87] | 206 | "nop \n" |
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[407] | 207 | ".set reorder \n" |
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| 208 | : |
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| 209 | : "r"(size),"r"(src),"r"(dst) |
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| 210 | : "$10","$11","$12","$13","$14","$15" ); |
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| 211 | |
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| 212 | hal_restore_irq( save_sr ); |
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[87] | 213 | |
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[299] | 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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[407] | 220 | uint32_t count = 0; |
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[1] | 221 | |
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[407] | 222 | uint32_t str = (uint32_t)u_str; |
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| 223 | |
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[1] | 224 | hal_disable_irq( &save_sr ); |
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| 225 | |
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| 226 | asm volatile( |
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[407] | 227 | ".set noreorder \n" |
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[1] | 228 | "ori $13, %1, 0 \n" /* $13 <= str */ |
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[407] | 229 | "mfc2 $15, $1 \n" /* $15 <= MMU_MODE */ |
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| 230 | "ori $14, $15, 0x7 \n" /* $14 <= mode DTLB on */ |
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[1] | 231 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
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| 232 | "1: \n" |
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[407] | 233 | "lb $12, 0($13) \n" /* read char from user space */ |
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[1] | 234 | "addi $13, $13, 1 \n" /* increment address */ |
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[407] | 235 | "bne $12, $0, 1b \n" /* loop until NUL found */ |
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| 236 | "addi %0, %0, 1 \n" /* increment count */ |
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| 237 | "mtc2 $15, $1 \n" /* restore MMU_MODE */ |
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| 238 | ".set reorder \n" |
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| 239 | : "+r"(count) |
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| 240 | : "r"(str) |
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| 241 | : "$12","$13","$14","$15" ); |
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[1] | 242 | |
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| 243 | hal_restore_irq( save_sr ); |
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| 244 | |
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| 245 | return count; |
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| 246 | } |
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| 247 | |
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