[1] | 1 | /* |
---|
| 2 | * hal_uspace.c - implementation of Generic User Space Access API for MIPS32 |
---|
| 3 | * |
---|
| 4 | * Author Mohamed Karaoui (2015) |
---|
| 5 | * Alain Greiner (2016) |
---|
| 6 | * |
---|
| 7 | * Copyright (c) UPMC Sorbonne Universites |
---|
| 8 | * |
---|
| 9 | * This file is part of ALMOS-MKH.. |
---|
| 10 | * |
---|
| 11 | * ALMOS-MKH. is free software; you can redistribute it and/or modify it |
---|
| 12 | * under the terms of the GNU General Public License as published by |
---|
| 13 | * the Free Software Foundation; version 2.0 of the License. |
---|
| 14 | * |
---|
| 15 | * ALMOS-MKH. is distributed in the hope that it will be useful, but |
---|
| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
---|
| 18 | * General Public License for more details. |
---|
| 19 | * |
---|
| 20 | * You should have received a copy of the GNU General Public License |
---|
| 21 | * along with ALMOS-MKH.; if not, write to the Free Software Foundation, |
---|
| 22 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
---|
| 23 | */ |
---|
| 24 | |
---|
[315] | 25 | #include <errno.h> |
---|
| 26 | #include <vmm.h> |
---|
[457] | 27 | #include <hal_kernel_types.h> |
---|
[1] | 28 | #include <hal_uspace.h> |
---|
| 29 | #include <hal_irqmask.h> |
---|
| 30 | |
---|
[425] | 31 | #include <printk.h> |
---|
| 32 | #include <thread.h> |
---|
| 33 | |
---|
[1] | 34 | /////////////////////////////////////////// |
---|
| 35 | void hal_copy_from_uspace( void * k_dst, |
---|
| 36 | void * u_src, |
---|
[425] | 37 | uint32_t size ) |
---|
[1] | 38 | { |
---|
| 39 | uint32_t save_sr; |
---|
| 40 | uint32_t i; |
---|
| 41 | uint32_t wsize; // number of words |
---|
| 42 | uint32_t src = (uint32_t)u_src; |
---|
| 43 | uint32_t dst = (uint32_t)k_dst; |
---|
| 44 | |
---|
| 45 | if( (dst & 0x3) || (src & 0x3) ) wsize = 0; // do it all in bytes |
---|
| 46 | else wsize = size >> 2; |
---|
| 47 | |
---|
| 48 | hal_disable_irq( &save_sr ); |
---|
| 49 | |
---|
[407] | 50 | |
---|
[1] | 51 | for( i = 0 ; i < wsize ; i++ ) // transfer one word per iteration |
---|
| 52 | { |
---|
| 53 | asm volatile( |
---|
| 54 | "mfc2 $15, $1 \n" /* save MMU_MODE */ |
---|
| 55 | "ori $14, $0, 0x7 \n" |
---|
| 56 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
---|
| 57 | "lw $13, 0(%0) \n" /* read data from user space */ |
---|
[87] | 58 | "mtc2 $15, $1 \n" /* restore MMU_MODE */ |
---|
[1] | 59 | "sw $13, 0(%1) \n" /* store data to kernel space */ |
---|
| 60 | : : "r"( src ) , "r"( dst ) : "$13","$14","$15", "memory" ); |
---|
| 61 | |
---|
| 62 | src += 4; |
---|
| 63 | dst += 4; |
---|
| 64 | } |
---|
| 65 | |
---|
| 66 | for( i = wsize << 2 ; i < size ; i++ ) // transfer one byte per iteration |
---|
| 67 | { |
---|
| 68 | asm volatile( |
---|
| 69 | "mfc2 $15, $1 \n" /* save MMU_MODE */ |
---|
| 70 | "ori $14, $0, 0x7 \n" |
---|
| 71 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
---|
| 72 | "lb $13, 0(%0) \n" /* read data from user space */ |
---|
[87] | 73 | "mtc2 $15, $1 \n" /* restore MMU_MODE */ |
---|
[1] | 74 | "sb $13, 0(%1) \n" /* store data to kernel space */ |
---|
| 75 | : : "r"( src ) , "r"( dst ) : "$13","$14","$15", "memory" ); |
---|
| 76 | |
---|
| 77 | src += 1; |
---|
| 78 | dst += 1; |
---|
| 79 | } |
---|
| 80 | |
---|
| 81 | hal_restore_irq( save_sr ); |
---|
| 82 | |
---|
[87] | 83 | } // end hal_copy_from_uspace() |
---|
| 84 | |
---|
[1] | 85 | /////////////////////////////////////////// |
---|
| 86 | void hal_copy_to_uspace( void * u_dst, |
---|
| 87 | void * k_src, |
---|
| 88 | uint32_t size ) |
---|
| 89 | { |
---|
| 90 | uint32_t save_sr; |
---|
| 91 | uint32_t i; |
---|
[87] | 92 | uint32_t wsize; // number of words if aligned |
---|
[1] | 93 | uint32_t src = (uint32_t)k_src; |
---|
| 94 | uint32_t dst = (uint32_t)u_dst; |
---|
| 95 | |
---|
[87] | 96 | if( (dst & 0x3) || (src & 0x3) ) wsize = 0; // not aligned |
---|
[1] | 97 | else wsize = size >> 2; |
---|
| 98 | |
---|
| 99 | hal_disable_irq( &save_sr ); |
---|
| 100 | |
---|
| 101 | for( i = 0 ; i < wsize ; i++ ) // transfer one word per iteration |
---|
| 102 | { |
---|
| 103 | asm volatile( |
---|
| 104 | "mfc2 $15, $1 \n" /* save MMU_MODE */ |
---|
| 105 | "lw $13, 0(%0) \n" /* read data from kernel space */ |
---|
| 106 | "ori $14, $0, 0x7 \n" |
---|
| 107 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
---|
| 108 | "sw $13, 0(%1) \n" /* store data to user space */ |
---|
[87] | 109 | "mtc2 $15, $1 \n" /* restore MMU_MODE */ |
---|
[1] | 110 | : : "r"( src ) , "r"( dst ) : "$13","$14","$15", "memory" ); |
---|
| 111 | |
---|
| 112 | src += 4; |
---|
| 113 | dst += 4; |
---|
| 114 | } |
---|
| 115 | |
---|
| 116 | for( i = wsize << 2 ; i < size ; i++ ) // transfer one byte per iteration |
---|
| 117 | { |
---|
| 118 | asm volatile( |
---|
| 119 | "mfc2 $15, $1 \n" /* save MMU_MODE */ |
---|
| 120 | "lw $13, 0(%0) \n" /* read data from kernel space */ |
---|
| 121 | "ori $14, $0, 0x7 \n" |
---|
| 122 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
---|
| 123 | "sb $13, 0(%1) \n" /* store data to user space */ |
---|
[87] | 124 | "mtc2 $15, $1 \n" /* restore MMU_MODE */ |
---|
[1] | 125 | : : "r"( src ) , "r"( dst ) : "$13","$14","$15", "memory" ); |
---|
| 126 | |
---|
| 127 | src += 1; |
---|
| 128 | dst += 1; |
---|
| 129 | } |
---|
| 130 | |
---|
| 131 | hal_restore_irq( save_sr ); |
---|
| 132 | |
---|
[87] | 133 | } // end hal_copy_to_uspace() |
---|
| 134 | |
---|
[407] | 135 | ////////////////////////////////////////////// |
---|
| 136 | void hal_strcpy_from_uspace( char * k_dst, |
---|
| 137 | char * u_src, |
---|
| 138 | uint32_t size ) |
---|
[87] | 139 | { |
---|
[407] | 140 | uint32_t save_sr; |
---|
[87] | 141 | uint32_t src = (uint32_t)u_src; |
---|
| 142 | uint32_t dst = (uint32_t)k_dst; |
---|
| 143 | |
---|
| 144 | hal_disable_irq( &save_sr ); |
---|
| 145 | |
---|
[425] | 146 | // loop on characters while ( (character != NUL) and (count < size ) ) |
---|
[87] | 147 | asm volatile( |
---|
[407] | 148 | ".set noreorder \n" |
---|
| 149 | "move $11, %0 \n" /* $11 <= count == size */ |
---|
| 150 | "move $12, %1 \n" /* $12 <= u_src */ |
---|
| 151 | "move $13, %2 \n" /* $13 <= k_dst */ |
---|
[425] | 152 | "mfc2 $15, $1 \n" /* $15 <= mode DTLB and ITLB off */ |
---|
| 153 | "ori $14, $15, 0x4 \n" /* $14 <= mode DTLB on */ |
---|
[407] | 154 | "1: \n" |
---|
[87] | 155 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
---|
[407] | 156 | "lb $10, 0($12) \n" /* read char from user space */ |
---|
[425] | 157 | "mtc2 $15, $1 \n" /* restore DTLB and ITLB off */ |
---|
[407] | 158 | "sb $10, 0($13) \n" /* store char to kernel space */ |
---|
[425] | 159 | "beq $10, $0, 2f \n" /* exit if char = 0 */ |
---|
[407] | 160 | "addi $11, $11, -1 \n" /* decrement count */ |
---|
| 161 | "addi $12, $12, 1 \n" /* increment u_src pointer */ |
---|
| 162 | "beq $11, $0, 2f \n" /* exit if count == 0 */ |
---|
| 163 | "addi $13, $13, 1 \n" /* increment k_src pointer */ |
---|
| 164 | "j 1b \n" /* jump to next iteration */ |
---|
| 165 | "2: \n" |
---|
[87] | 166 | "nop \n" |
---|
[407] | 167 | ".set reorder \n" |
---|
| 168 | : |
---|
| 169 | : "r"(size),"r"(src),"r"(dst) |
---|
| 170 | : "$10","$11","$12","$13","$14","$15" ); |
---|
| 171 | |
---|
| 172 | hal_restore_irq( save_sr ); |
---|
[87] | 173 | |
---|
| 174 | } // hal_strcpy_from_uspace() |
---|
| 175 | |
---|
[121] | 176 | //////////////////////////////////////////// |
---|
[407] | 177 | void hal_strcpy_to_uspace( char * u_dst, |
---|
| 178 | char * k_src, |
---|
| 179 | uint32_t size ) |
---|
[121] | 180 | { |
---|
[407] | 181 | uint32_t save_sr; |
---|
[87] | 182 | uint32_t src = (uint32_t)k_src; |
---|
| 183 | uint32_t dst = (uint32_t)u_dst; |
---|
| 184 | |
---|
| 185 | hal_disable_irq( &save_sr ); |
---|
| 186 | |
---|
[407] | 187 | // loop on characters while ( (character != NUL) and (count < size) ) |
---|
[87] | 188 | asm volatile( |
---|
[407] | 189 | ".set noreorder \n" |
---|
| 190 | "move $11, %0 \n" /* $11 <= count == size */ |
---|
| 191 | "move $12, %1 \n" /* $12 <= k_src */ |
---|
| 192 | "move $13, %2 \n" /* $13 <= u_dst */ |
---|
[425] | 193 | "mfc2 $15, $1 \n" /* $15 <= mode DTLB and ITLB off */ |
---|
| 194 | "ori $14, $15, 0x4 \n" /* $14 <= mode DTLB on */ |
---|
[407] | 195 | "1: \n" |
---|
| 196 | "lb $10, 0($12) \n" /* read char from kernel space */ |
---|
[87] | 197 | "mtc2 $14, $1 \n" /* MMU_MODE <= DTLB ON */ |
---|
[407] | 198 | "sb $10, 0($13) \n" /* store char to user space */ |
---|
[425] | 199 | "mtc2 $15, $1 \n" /* restore DTLB and ITLB off */ |
---|
| 200 | "beq $10, $0, 2f \n" /* exit if char == 0 */ |
---|
[407] | 201 | "addi $11, $11, -1 \n" /* decrement count */ |
---|
| 202 | "addi $12, $12, 1 \n" /* increment k_src pointer */ |
---|
| 203 | "beq $11, $0, 2f \n" /* exit if count == size */ |
---|
| 204 | "addi $13, $13, 1 \n" /* increment u_src pointer */ |
---|
| 205 | "j 1b \n" /* jump to next iteration */ |
---|
| 206 | "2: \n" |
---|
[87] | 207 | "nop \n" |
---|
[407] | 208 | ".set reorder \n" |
---|
| 209 | : |
---|
| 210 | : "r"(size),"r"(src),"r"(dst) |
---|
| 211 | : "$10","$11","$12","$13","$14","$15" ); |
---|
| 212 | |
---|
| 213 | hal_restore_irq( save_sr ); |
---|
[87] | 214 | |
---|
[299] | 215 | } // hal_strcpy_to_uspace() |
---|
[87] | 216 | |
---|
[1] | 217 | /////////////////////////////////////////////// |
---|
| 218 | uint32_t hal_strlen_from_uspace( char * u_str ) |
---|
| 219 | { |
---|
| 220 | uint32_t save_sr; |
---|
[407] | 221 | uint32_t count = 0; |
---|
[425] | 222 | uint32_t str = (uint32_t)u_str; |
---|
[1] | 223 | |
---|
| 224 | hal_disable_irq( &save_sr ); |
---|
| 225 | |
---|
| 226 | asm volatile( |
---|
[407] | 227 | ".set noreorder \n" |
---|
[425] | 228 | "move $13, %1 \n" /* $13 <= str */ |
---|
| 229 | "mfc2 $15, $1 \n" /* $15 <= DTLB and ITLB off */ |
---|
| 230 | "ori $14, $15, 0x4 \n" /* $14 <= mode DTLB on */ |
---|
[1] | 231 | "1: \n" |
---|
[425] | 232 | "mtc2 $14, $1 \n" /* set DTLB on */ |
---|
[407] | 233 | "lb $12, 0($13) \n" /* read char from user space */ |
---|
[425] | 234 | "mtc2 $15, $1 \n" /* set DTLB off */ |
---|
[1] | 235 | "addi $13, $13, 1 \n" /* increment address */ |
---|
[407] | 236 | "bne $12, $0, 1b \n" /* loop until NUL found */ |
---|
| 237 | "addi %0, %0, 1 \n" /* increment count */ |
---|
| 238 | ".set reorder \n" |
---|
| 239 | : "+r"(count) |
---|
| 240 | : "r"(str) |
---|
| 241 | : "$12","$13","$14","$15" ); |
---|
[1] | 242 | |
---|
| 243 | hal_restore_irq( save_sr ); |
---|
| 244 | |
---|
| 245 | return count; |
---|
| 246 | } |
---|
| 247 | |
---|