[657] | 1 | /* |
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| 2 | * remote_buf.c Remotely accessible, circular buffer implementation. |
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| 3 | * |
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| 4 | * Authors : Alain Greiner (2016,2017,2018,2019,2020) |
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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 <hal_kernel_types.h> |
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| 25 | #include <hal_irqmask.h> |
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| 26 | #include <hal_remote.h> |
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| 27 | #include <hal_uspace.h> |
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| 28 | #include <bits.h> |
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| 29 | #include <memcpy.h> |
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| 30 | #include <kmem.h> |
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| 31 | #include <remote_buf.h> |
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| 32 | |
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| 33 | /////////////////////////////////////////// |
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| 34 | error_t remote_buf_create( xptr_t buf_xp, |
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| 35 | uint32_t size ) |
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| 36 | { |
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| 37 | kmem_req_t req; |
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| 38 | uint8_t * data; |
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| 39 | |
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| 40 | remote_buf_t * buf_ptr = GET_PTR( buf_xp ); |
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| 41 | cxy_t buf_cxy = GET_CXY( buf_xp ); |
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| 42 | |
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| 43 | // allocate the data buffer |
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| 44 | if( size >= CONFIG_PPM_PAGE_SIZE ) |
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| 45 | { |
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| 46 | req.type = KMEM_PPM; |
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| 47 | req.order = bits_log2( size >> CONFIG_PPM_PAGE_SHIFT ); |
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| 48 | req.flags = AF_NONE; |
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| 49 | data = kmem_remote_alloc( buf_cxy , &req ); |
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| 50 | } |
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| 51 | else |
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| 52 | { |
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| 53 | req.type = KMEM_KCM; |
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| 54 | req.order = bits_log2( size ); |
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| 55 | req.flags = AF_NONE; |
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| 56 | data = kmem_remote_alloc( buf_cxy , &req ); |
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| 57 | } |
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| 58 | |
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| 59 | if( data == NULL ) return -1; |
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| 60 | |
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| 61 | // initialize buffer descriptor |
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| 62 | hal_remote_s32( XPTR( buf_cxy , &buf_ptr->size ) , size ); |
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| 63 | hal_remote_s32( XPTR( buf_cxy , &buf_ptr->ptw ) , 0 ); |
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| 64 | hal_remote_s32( XPTR( buf_cxy , &buf_ptr->ptr ) , 0 ); |
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| 65 | hal_remote_s32( XPTR( buf_cxy , &buf_ptr->sts ) , 0 ); |
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| 66 | hal_remote_spt( XPTR( buf_cxy , &buf_ptr->data ) , data ); |
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| 67 | |
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| 68 | return 0; |
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| 69 | |
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| 70 | } // end remote_buf_create() |
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| 71 | |
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| 72 | ///////////////////////////////////////// |
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| 73 | void remote_buf_destroy( xptr_t buf_xp ) |
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| 74 | { |
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| 75 | kmem_req_t req; |
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| 76 | |
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| 77 | remote_buf_t * buf_ptr = GET_PTR( buf_xp ); |
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| 78 | cxy_t buf_cxy = GET_CXY( buf_xp ); |
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| 79 | |
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| 80 | // release memory allocated to data buffer |
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| 81 | if( buf_ptr->size >= CONFIG_PPM_PAGE_SIZE ) |
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| 82 | { |
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| 83 | req.type = KMEM_PPM; |
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| 84 | req.ptr = hal_remote_lpt( XPTR( buf_cxy , &buf_ptr->data ) ); |
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| 85 | kmem_remote_free( buf_cxy , &req ); |
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| 86 | } |
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| 87 | else |
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| 88 | { |
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| 89 | req.type = KMEM_KCM; |
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| 90 | req.ptr = hal_remote_lpt( XPTR( buf_cxy , &buf_ptr->data ) ); |
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| 91 | kmem_remote_free( buf_cxy , &req ); |
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| 92 | } |
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| 93 | } |
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| 94 | |
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| 95 | ///////////////////////////////////////// |
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| 96 | void remote_buf_reset( xptr_t buf_xp ) |
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| 97 | { |
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| 98 | remote_buf_t * buf_ptr = GET_PTR( buf_xp ); |
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| 99 | cxy_t buf_cxy = GET_CXY( buf_xp ); |
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| 100 | |
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| 101 | hal_remote_s32( XPTR( buf_cxy , &buf_ptr->ptw ) , 0 ); |
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| 102 | hal_remote_s32( XPTR( buf_cxy , &buf_ptr->ptr ) , 0 ); |
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| 103 | hal_remote_s32( XPTR( buf_cxy , &buf_ptr->sts ) , 0 ); |
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| 104 | } |
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| 105 | |
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| 106 | ///////////////////////////////////////////////// |
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| 107 | error_t remote_buf_get_to_user( xptr_t buf_xp, |
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| 108 | uint8_t * u_buf, |
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| 109 | uint32_t nbytes ) |
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| 110 | { |
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| 111 | remote_buf_t * buf_ptr = GET_PTR( buf_xp ); |
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| 112 | cxy_t buf_cxy = GET_CXY( buf_xp ); |
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| 113 | |
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| 114 | // build relevant extended pointers |
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| 115 | xptr_t sts_xp = XPTR( buf_cxy , &buf_ptr->sts ); |
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| 116 | xptr_t ptr_xp = XPTR( buf_cxy , &buf_ptr->ptr ); |
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| 117 | xptr_t size_xp = XPTR( buf_cxy , &buf_ptr->size ); |
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| 118 | xptr_t data_xp = XPTR( buf_cxy , &buf_ptr->data ); |
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| 119 | |
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| 120 | // get relevant infos from remote buffer descriptor |
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| 121 | uint32_t sts = hal_remote_l32( sts_xp ); |
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| 122 | uint32_t ptr = hal_remote_l32( ptr_xp ); |
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| 123 | uint32_t size = hal_remote_l32( size_xp ); |
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| 124 | uint8_t * data = hal_remote_lpt( data_xp ); |
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| 125 | |
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| 126 | // check enough bytes in buffer |
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| 127 | if( nbytes > sts ) return -1; |
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| 128 | |
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| 129 | // move nbytes |
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| 130 | if( (ptr + nbytes) <= size) // no wrap around => one move |
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| 131 | { |
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| 132 | hal_copy_to_uspace( u_buf, |
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| 133 | XPTR( buf_cxy , data + ptr ), |
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| 134 | nbytes ); |
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| 135 | } |
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| 136 | else // wrap around => two moves |
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| 137 | { |
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| 138 | uint32_t bytes_1 = size - ptr; |
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| 139 | uint32_t bytes_2 = nbytes - bytes_1; |
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| 140 | |
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| 141 | hal_copy_to_uspace( u_buf, |
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| 142 | XPTR( buf_cxy , data + ptr ), |
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| 143 | bytes_1 ); |
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| 144 | |
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| 145 | hal_copy_to_uspace( u_buf + bytes_1, |
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| 146 | XPTR( buf_cxy , data ), |
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| 147 | bytes_2 ); |
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| 148 | } |
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| 149 | |
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| 150 | // update ptr in buffer descriptor |
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| 151 | hal_remote_s32( ptr_xp , (ptr + nbytes) % size ); |
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| 152 | |
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| 153 | // atomically update sts |
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| 154 | hal_remote_atomic_add( sts_xp , -nbytes ); |
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| 155 | |
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| 156 | return 0; |
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| 157 | |
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| 158 | } // end remote_buf_get_to_user() |
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| 159 | |
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| 160 | /////////////////////////////////////////////////// |
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| 161 | error_t remote_buf_get_to_kernel( xptr_t buf_xp, |
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| 162 | uint8_t * k_buf, |
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| 163 | uint32_t nbytes ) |
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| 164 | { |
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| 165 | remote_buf_t * buf_ptr = GET_PTR( buf_xp ); |
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| 166 | cxy_t buf_cxy = GET_CXY( buf_xp ); |
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| 167 | |
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| 168 | // build relevant extended pointers |
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| 169 | xptr_t sts_xp = XPTR( buf_cxy , &buf_ptr->sts ); |
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| 170 | xptr_t ptr_xp = XPTR( buf_cxy , &buf_ptr->ptr ); |
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| 171 | xptr_t size_xp = XPTR( buf_cxy , &buf_ptr->size ); |
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| 172 | xptr_t data_xp = XPTR( buf_cxy , &buf_ptr->data ); |
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| 173 | |
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| 174 | // get relevant infos from remote buffer descriptor |
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| 175 | uint32_t sts = hal_remote_l32( sts_xp ); |
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| 176 | uint32_t ptr = hal_remote_l32( ptr_xp ); |
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| 177 | uint32_t size = hal_remote_l32( size_xp ); |
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| 178 | uint8_t * data = hal_remote_lpt( data_xp ); |
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| 179 | |
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| 180 | // check enough bytes in buffer |
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| 181 | if( nbytes > sts ) return -1; |
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| 182 | |
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| 183 | // move nbytes |
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| 184 | if( (ptr + nbytes) <= size) // no wrap around => one move |
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| 185 | { |
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| 186 | hal_remote_memcpy( XPTR( local_cxy , k_buf ), |
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| 187 | XPTR( buf_cxy , data + ptr ), |
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| 188 | nbytes ); |
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| 189 | } |
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| 190 | else // wrap around => two moves |
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| 191 | { |
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| 192 | uint32_t bytes_1 = size - ptr; |
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| 193 | uint32_t bytes_2 = nbytes - bytes_1; |
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| 194 | |
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| 195 | hal_remote_memcpy( XPTR( local_cxy , k_buf ), |
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| 196 | XPTR( buf_cxy , data + ptr ), |
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| 197 | bytes_1 ); |
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| 198 | |
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| 199 | hal_remote_memcpy( XPTR( local_cxy , k_buf + bytes_1 ), |
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| 200 | XPTR( buf_cxy , data ), |
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| 201 | bytes_2 ); |
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| 202 | } |
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| 203 | |
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| 204 | // update ptr in buffer descriptor |
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| 205 | hal_remote_s32( ptr_xp , (ptr + nbytes) % size ); |
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| 206 | |
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| 207 | // atomically update sts |
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| 208 | hal_remote_atomic_add( sts_xp , -nbytes ); |
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| 209 | |
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| 210 | return 0; |
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| 211 | |
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| 212 | } // end remote_buf_get_to_user() |
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| 213 | |
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| 214 | /////////////////////////////////////////////////// |
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| 215 | error_t remote_buf_put_from_user( xptr_t buf_xp, |
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| 216 | uint8_t * u_buf, |
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| 217 | uint32_t nbytes ) |
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| 218 | { |
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| 219 | remote_buf_t * buf_ptr = GET_PTR( buf_xp ); |
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| 220 | cxy_t buf_cxy = GET_CXY( buf_xp ); |
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| 221 | |
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| 222 | // build relevant extended pointers |
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| 223 | xptr_t sts_xp = XPTR( buf_cxy , &buf_ptr->sts ); |
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| 224 | xptr_t ptw_xp = XPTR( buf_cxy , &buf_ptr->ptw ); |
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| 225 | xptr_t size_xp = XPTR( buf_cxy , &buf_ptr->size ); |
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| 226 | xptr_t data_xp = XPTR( buf_cxy , &buf_ptr->data ); |
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| 227 | |
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| 228 | // get relevant infos from remote buffer descriptor |
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| 229 | uint32_t sts = hal_remote_l32( sts_xp ); |
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| 230 | uint32_t ptw = hal_remote_l32( ptw_xp ); |
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| 231 | uint32_t size = hal_remote_l32( size_xp ); |
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| 232 | uint8_t * data = hal_remote_lpt( data_xp ); |
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| 233 | |
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| 234 | // check enough space in buffer |
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| 235 | if( nbytes > (size - sts) ) return -1; |
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| 236 | |
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| 237 | // move nbytes |
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| 238 | if( (ptw + nbytes) <= size) // no wrap around => one move |
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| 239 | { |
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| 240 | hal_copy_from_uspace( XPTR( buf_cxy , data + ptw ), |
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| 241 | u_buf, |
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| 242 | nbytes ); |
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| 243 | } |
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| 244 | else // wrap around => two moves |
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| 245 | { |
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| 246 | uint32_t bytes_1 = size - ptw; |
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| 247 | uint32_t bytes_2 = nbytes - bytes_1; |
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| 248 | |
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| 249 | hal_copy_from_uspace( XPTR( buf_cxy , data + ptw ), |
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| 250 | u_buf, |
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| 251 | bytes_1 ); |
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| 252 | |
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| 253 | hal_copy_from_uspace( XPTR( buf_cxy , data ), |
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| 254 | u_buf + bytes_1, |
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| 255 | bytes_2 ); |
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| 256 | } |
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| 257 | |
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| 258 | // update ptw in buffer descriptor |
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| 259 | hal_remote_s32( ptw_xp , (ptw + nbytes) % size ); |
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| 260 | |
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| 261 | // atomically update sts |
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| 262 | hal_remote_atomic_add( sts_xp , nbytes ); |
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| 263 | |
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| 264 | return 0; |
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| 265 | |
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| 266 | } // end remote_buf_put_from_user() |
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| 267 | |
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| 268 | ///////////////////////////////////////////////////// |
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| 269 | error_t remote_buf_put_from_kernel( xptr_t buf_xp, |
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| 270 | uint8_t * k_buf, |
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| 271 | uint32_t nbytes ) |
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| 272 | { |
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| 273 | remote_buf_t * buf_ptr = GET_PTR( buf_xp ); |
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| 274 | cxy_t buf_cxy = GET_CXY( buf_xp ); |
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| 275 | |
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| 276 | // build relevant extended pointers |
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| 277 | xptr_t sts_xp = XPTR( buf_cxy , &buf_ptr->sts ); |
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| 278 | xptr_t ptw_xp = XPTR( buf_cxy , &buf_ptr->ptw ); |
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| 279 | xptr_t size_xp = XPTR( buf_cxy , &buf_ptr->size ); |
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| 280 | xptr_t data_xp = XPTR( buf_cxy , &buf_ptr->data ); |
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| 281 | |
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| 282 | // get relevant infos from remote buffer descriptor |
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| 283 | uint32_t sts = hal_remote_l32( sts_xp ); |
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| 284 | uint32_t ptw = hal_remote_l32( ptw_xp ); |
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| 285 | uint32_t size = hal_remote_l32( size_xp ); |
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| 286 | uint8_t * data = hal_remote_lpt( data_xp ); |
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| 287 | |
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| 288 | // check enough space in buffer |
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| 289 | if( nbytes > (size - sts) ) return -1; |
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| 290 | |
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| 291 | // move nbytes |
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| 292 | if( (ptw + nbytes) <= size) // no wrap around => one move |
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| 293 | { |
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| 294 | hal_remote_memcpy( XPTR( buf_cxy , data + ptw ), |
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| 295 | XPTR( local_cxy , k_buf ), |
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| 296 | nbytes ); |
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| 297 | } |
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| 298 | else // wrap around => two moves |
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| 299 | { |
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| 300 | uint32_t bytes_1 = size - ptw; |
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| 301 | uint32_t bytes_2 = nbytes - bytes_1; |
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| 302 | |
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| 303 | hal_remote_memcpy( XPTR( buf_cxy , data + ptw ), |
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| 304 | XPTR( local_cxy , k_buf ), |
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| 305 | bytes_1 ); |
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| 306 | |
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| 307 | hal_remote_memcpy( XPTR( buf_cxy , data ), |
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| 308 | XPTR( local_cxy , k_buf + bytes_1 ), |
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| 309 | bytes_2 ); |
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| 310 | } |
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| 311 | |
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| 312 | // update ptw in buffer descriptor |
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| 313 | hal_remote_s32( ptw_xp , (ptw + nbytes) % size ); |
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| 314 | |
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| 315 | // atomically update sts |
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| 316 | hal_remote_atomic_add( sts_xp , nbytes ); |
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| 317 | |
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| 318 | return 0; |
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| 319 | |
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| 320 | } // end remote_buf_put_from_kernel() |
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| 321 | |
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| 322 | //////////////////////////////////////////// |
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| 323 | uint32_t remote_buf_status( xptr_t buf_xp ) |
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| 324 | { |
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| 325 | remote_buf_t * buf_ptr = GET_PTR( buf_xp ); |
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| 326 | cxy_t buf_cxy = GET_CXY( buf_xp ); |
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| 327 | |
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| 328 | return hal_remote_l32( XPTR( buf_cxy , &buf_ptr->sts ) ); |
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| 329 | |
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| 330 | } // end remote_buf_status() |
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| 331 | |
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| 332 | |
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