[1] | 1 | /* |
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[23] | 2 | * sys_read.c - read bytes from a file |
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[1] | 3 | * |
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[440] | 4 | * Author Alain Greiner (2016,2017,2018) |
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[1] | 5 | * |
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[23] | 6 | * Copyright (c) UPMC Sorbonne Universites |
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[1] | 7 | * |
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[23] | 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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[1] | 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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[23] | 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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[1] | 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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[23] | 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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[1] | 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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[23] | 24 | #include <kernel_config.h> |
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[457] | 25 | #include <hal_kernel_types.h> |
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[23] | 26 | #include <hal_uspace.h> |
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[409] | 27 | #include <hal_irqmask.h> |
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[23] | 28 | #include <hal_special.h> |
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[1] | 29 | #include <errno.h> |
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[23] | 30 | #include <vfs.h> |
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| 31 | #include <vmm.h> |
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[1] | 32 | #include <thread.h> |
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[23] | 33 | #include <printk.h> |
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| 34 | #include <process.h> |
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[1] | 35 | |
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[407] | 36 | // TODO: concurrent user page(s) munmap need to be handled [AG] |
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[23] | 37 | |
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[407] | 38 | extern uint32_t enter_sys_read; |
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[436] | 39 | extern uint32_t enter_devfs_read; |
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[407] | 40 | extern uint32_t enter_txt_read; |
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[436] | 41 | extern uint32_t enter_chdev_cmd_read; |
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| 42 | extern uint32_t enter_chdev_server_read; |
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| 43 | extern uint32_t enter_tty_cmd_read; |
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| 44 | extern uint32_t enter_tty_isr_read; |
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| 45 | extern uint32_t exit_tty_isr_read; |
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| 46 | extern uint32_t exit_tty_cmd_read; |
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| 47 | extern uint32_t exit_chdev_server_read; |
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| 48 | extern uint32_t exit_chdev_cmd_read; |
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[407] | 49 | extern uint32_t exit_txt_read; |
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[436] | 50 | extern uint32_t exit_devfs_read; |
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[407] | 51 | extern uint32_t exit_sys_read; |
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| 52 | |
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| 53 | |
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[23] | 54 | ///////////////////////////////// |
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| 55 | int sys_read( uint32_t file_id, |
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[407] | 56 | void * vaddr, |
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[23] | 57 | uint32_t count ) |
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[1] | 58 | { |
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[23] | 59 | error_t error; |
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[440] | 60 | vseg_t * vseg; // required for user space checking |
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[23] | 61 | xptr_t file_xp; // remote file extended pointer |
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[407] | 62 | uint32_t nbytes; // number of bytes actually read |
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[408] | 63 | reg_t save_sr; // required to enable IRQs during syscall |
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[407] | 64 | |
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[446] | 65 | thread_t * this = CURRENT_THREAD; |
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| 66 | process_t * process = this->process; |
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| 67 | xptr_t process_owner_xp = process->owner_xp; |
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[23] | 68 | |
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[438] | 69 | #if DEBUG_SYS_READ |
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[433] | 70 | uint64_t tm_start; |
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| 71 | uint64_t tm_end; |
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| 72 | tm_start = hal_get_cycles(); |
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[438] | 73 | if( DEBUG_SYS_READ < tm_start ) |
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[435] | 74 | printk("\n[DBG] %s : thread %x enter / process %x / vaddr = %x / count %d / cycle %d\n", |
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[433] | 75 | __FUNCTION__, this, process->pid, vaddr, count, (uint32_t)tm_start ); |
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| 76 | #endif |
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| 77 | |
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[438] | 78 | #if (DEBUG_SYS_READ & 1) |
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[436] | 79 | enter_sys_read = (uint32_t)tm_start; |
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| 80 | #endif |
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| 81 | |
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[23] | 82 | // check file_id argument |
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| 83 | if( file_id >= CONFIG_PROCESS_FILE_MAX_NR ) |
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[1] | 84 | { |
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[435] | 85 | |
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[438] | 86 | #if DEBUG_SYSCALLS_ERROR |
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[435] | 87 | printk("\n[ERROR] in %s : illegal file descriptor index = %d\n", __FUNCTION__ , file_id ); |
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| 88 | #endif |
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[23] | 89 | this->errno = EBADFD; |
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[1] | 90 | return -1; |
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| 91 | } |
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| 92 | |
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[23] | 93 | // check user buffer in user space |
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[440] | 94 | error = vmm_get_vseg( process , (intptr_t)vaddr , &vseg ); |
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[23] | 95 | |
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| 96 | if ( error ) |
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| 97 | { |
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[435] | 98 | |
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[438] | 99 | #if DEBUG_SYSCALLS_ERROR |
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[440] | 100 | printk("\n[ERROR] in %s : user buffer unmapped %x / thread %x / process %x\n", |
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| 101 | __FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid ); |
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| 102 | vmm_display( process , false ); |
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[435] | 103 | #endif |
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[23] | 104 | this->errno = EINVAL; |
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| 105 | return -1; |
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| 106 | } |
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| 107 | |
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[408] | 108 | // enable IRQs |
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[421] | 109 | hal_enable_irq( &save_sr ); |
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[408] | 110 | |
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[23] | 111 | // get extended pointer on remote file descriptor |
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| 112 | file_xp = process_fd_get_xptr( process , file_id ); |
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| 113 | |
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| 114 | if( file_xp == XPTR_NULL ) |
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| 115 | { |
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[435] | 116 | |
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[438] | 117 | #if DEBUG_SYSCALLS_ERROR |
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[435] | 118 | printk("\n[ERROR] in %s : undefined fd_id %d in process %x\n", |
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| 119 | __FUNCTION__ , file_id , process->pid ); |
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| 120 | #endif |
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[23] | 121 | this->errno = EBADFD; |
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| 122 | return -1; |
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| 123 | } |
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| 124 | |
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| 125 | // get file descriptor cluster and local pointer |
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[436] | 126 | vfs_file_t * file_ptr = GET_PTR( file_xp ); |
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[23] | 127 | cxy_t file_cxy = GET_CXY( file_xp ); |
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| 128 | |
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| 129 | // check file readable |
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| 130 | uint32_t attr = hal_remote_lw( XPTR( file_cxy , &file_ptr->attr ) ); |
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| 131 | if( (attr & FD_ATTR_READ_ENABLE) == 0 ) |
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[1] | 132 | { |
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[435] | 133 | |
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[438] | 134 | #if DEBUG_SYSCALLS_ERROR |
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[435] | 135 | printk("\n[ERROR] in %s : file %d not readable in process %x\n", |
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| 136 | __FUNCTION__ , file_id , process->pid ); |
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| 137 | #endif |
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[23] | 138 | this->errno = EBADFD; |
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[1] | 139 | return -1; |
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| 140 | } |
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[313] | 141 | |
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[407] | 142 | // get file type |
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| 143 | vfs_inode_type_t type = hal_remote_lw( XPTR( file_cxy , &file_ptr->type ) ); |
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[313] | 144 | |
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[407] | 145 | // action depend on file type |
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[421] | 146 | if( type == INODE_TYPE_FILE ) // check file readable & read from mapper |
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[23] | 147 | { |
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[421] | 148 | // check file readable |
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| 149 | uint32_t attr = hal_remote_lw( XPTR( file_cxy , &file_ptr->attr ) ); |
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[443] | 150 | |
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[421] | 151 | if( (attr & FD_ATTR_READ_ENABLE) == 0 ) |
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| 152 | { |
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[435] | 153 | |
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[438] | 154 | #if DEBUG_SYSCALLS_ERROR |
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[435] | 155 | printk("\n[ERROR] in %s : file %d not readable in process %x\n", |
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| 156 | __FUNCTION__ , file_id , process->pid ); |
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| 157 | #endif |
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[421] | 158 | this->errno = EBADFD; |
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| 159 | return -1; |
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| 160 | } |
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| 161 | |
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| 162 | // move count bytes from mapper |
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[407] | 163 | nbytes = vfs_user_move( true, // from mapper to buffer |
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| 164 | file_xp, |
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| 165 | vaddr, |
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| 166 | count ); |
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| 167 | } |
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[446] | 168 | else if( type == INODE_TYPE_DEV ) // check ownership & read from device |
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[407] | 169 | { |
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[436] | 170 | // get cluster and pointers on TXT_RX chdev |
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| 171 | xptr_t chdev_xp = chdev_from_file( file_xp ); |
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| 172 | cxy_t chdev_cxy = GET_CXY( chdev_xp ); |
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| 173 | chdev_t * chdev_ptr = GET_PTR( chdev_xp ); |
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| 174 | |
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[446] | 175 | volatile xptr_t txt_owner_xp; |
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| 176 | uint32_t iter = 0; |
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[436] | 177 | |
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| 178 | while( 1 ) |
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| 179 | { |
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[446] | 180 | // extended pointer on TXT owner process |
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| 181 | txt_owner_xp = hal_remote_lwd( XPTR( chdev_cxy , &chdev_ptr->ext.txt.owner_xp ) ); |
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[436] | 182 | |
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| 183 | // check TXT_RX ownership |
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[446] | 184 | if ( process_owner_xp != txt_owner_xp ) |
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[436] | 185 | { |
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[446] | 186 | if( (iter & 0xFFF) == 0 ) |
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| 187 | printk("\n[WARNING] in %s : thread %x in process %x wait TXT_RX / cycle %d\n", |
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| 188 | __FUNCTION__, this->trdid, process->pid, (uint32_t)hal_get_cycles() ); |
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| 189 | |
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[436] | 190 | // deschedule without blocking |
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[446] | 191 | sched_yield( "wait TXT_RX ownership" ); |
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| 192 | |
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| 193 | iter++; |
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[436] | 194 | } |
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| 195 | else |
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| 196 | { |
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| 197 | break; |
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| 198 | } |
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| 199 | } |
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| 200 | |
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[421] | 201 | // move count bytes from device |
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[407] | 202 | nbytes = devfs_user_move( true, // from device to buffer |
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| 203 | file_xp, |
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| 204 | vaddr, |
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| 205 | count ); |
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[421] | 206 | |
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[407] | 207 | } |
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| 208 | else |
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| 209 | { |
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| 210 | nbytes = 0; |
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[421] | 211 | assert( false , __FUNCTION__ , "file type %d non supported yet\n", type ); |
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[407] | 212 | } |
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| 213 | |
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| 214 | if( nbytes != count ) |
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| 215 | { |
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[435] | 216 | |
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[438] | 217 | #if DEBUG_SYSCALLS_ERROR |
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[435] | 218 | printk("\n[ERROR] in %s cannot read data from file %d in process %x\n", |
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| 219 | __FUNCTION__ , file_id , process->pid ); |
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| 220 | #endif |
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[313] | 221 | this->errno = error; |
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| 222 | return -1; |
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[23] | 223 | } |
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| 224 | |
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[408] | 225 | // restore IRQs |
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[421] | 226 | hal_restore_irq( save_sr ); |
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[408] | 227 | |
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[124] | 228 | hal_fence(); |
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[23] | 229 | |
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[438] | 230 | #if DEBUG_SYS_READ |
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[409] | 231 | tm_end = hal_get_cycles(); |
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[438] | 232 | if( DEBUG_SYS_READ < tm_end ) |
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[435] | 233 | printk("\n[DBG] %s : thread %x exit / process %x / cycle %d\n" |
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[441] | 234 | "nbytes = %d / file_id = %d / cost = %d\n", |
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[436] | 235 | __FUNCTION__ , this, process->pid, |
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[441] | 236 | (uint32_t)tm_start , nbytes , file_id , (uint32_t)(tm_end - tm_start) ); |
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[409] | 237 | #endif |
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[23] | 238 | |
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[438] | 239 | #if (DEBUG_SYS_READ & 1) |
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[418] | 240 | exit_sys_read = (uint32_t)tm_end; |
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[407] | 241 | |
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[443] | 242 | printk("\n***** timing to read one character *****\n" |
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[435] | 243 | " - enter_sys_read = %d / delta %d\n" |
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| 244 | " - enter_devfs_read = %d / delta %d\n" |
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| 245 | " - enter_txt_read = %d / delta %d\n" |
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| 246 | " - enter_chdev_cmd_read = %d / delta %d\n" |
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| 247 | " - enter_chdev_server_read = %d / delta %d\n" |
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| 248 | " - enter_tty_cmd_read = %d / delta %d\n" |
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| 249 | " - enter_tty_isr_read = %d / delta %d\n" |
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| 250 | " - exit_tty_isr_read = %d / delta %d\n" |
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| 251 | " - exit_tty_cmd_read = %d / delta %d\n" |
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| 252 | " - exit_chdev_server_read = %d / delta %d\n" |
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| 253 | " - exit_chdev_cmd_read = %d / delta %d\n" |
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| 254 | " - exit_txt_read = %d / delta %d\n" |
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| 255 | " - exit_devfs_read = %d / delta %d\n" |
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| 256 | " - exit_sys_read = %d / delta %d\n", |
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| 257 | enter_sys_read , 0 , |
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| 258 | enter_devfs_read , enter_devfs_read - enter_sys_read , |
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| 259 | enter_txt_read , enter_txt_read - enter_devfs_read , |
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| 260 | enter_chdev_cmd_read , enter_chdev_cmd_read - enter_txt_read , |
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| 261 | enter_chdev_server_read , enter_chdev_server_read - enter_chdev_cmd_read , |
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| 262 | enter_tty_cmd_read , enter_tty_cmd_read - enter_chdev_server_read , |
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| 263 | enter_tty_isr_read , enter_tty_isr_read - enter_tty_cmd_read , |
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| 264 | exit_tty_isr_read , exit_tty_isr_read - enter_tty_isr_read , |
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| 265 | exit_tty_cmd_read , exit_tty_cmd_read - exit_tty_isr_read , |
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| 266 | exit_chdev_server_read , exit_chdev_server_read - exit_tty_cmd_read , |
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| 267 | exit_chdev_cmd_read , exit_chdev_cmd_read - exit_chdev_server_read , |
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| 268 | exit_txt_read , exit_txt_read - exit_chdev_cmd_read , |
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| 269 | exit_devfs_read , exit_devfs_read - exit_txt_read , |
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| 270 | exit_sys_read , exit_sys_read - exit_devfs_read ); |
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[407] | 271 | #endif |
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| 272 | |
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| 273 | return nbytes; |
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| 274 | |
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[23] | 275 | } // end sys_read() |
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