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001 /* Copyright (C) 2005 David Decotigny 001 /* Copyright (C) 2005 David Decotigny 002 002 003 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 007 007 008 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 011 GNU General Public License for more details. 012 012 013 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 016 USA. 017 */ 017 */ 018 018 019 #include <sos/assert.h> 019 #include <sos/assert.h> 020 #include <sos/kmalloc.h> 020 #include <sos/kmalloc.h> 021 #include <sos/physmem.h> 021 #include <sos/physmem.h> 022 #include <hwcore/paging.h> 022 #include <hwcore/paging.h> 023 #include <sos/kmem_slab.h> 023 #include <sos/kmem_slab.h> 024 #include <sos/list.h> 024 #include <sos/list.h> 025 #include <hwcore/paging.h> 025 #include <hwcore/paging.h> 026 #include <drivers/devices.h> 026 #include <drivers/devices.h> 027 #include <sos/kmem_vmm.h> 027 #include <sos/kmem_vmm.h> 028 #include <sos/uaccess.h> 028 #include <sos/uaccess.h> 029 #include <sos/chardev.h> 029 #include <sos/chardev.h> 030 030 031 #include "mem.h" 031 #include "mem.h" 032 032 033 033 034 /** 034 /** 035 * A mapped mem/kmem resource 035 * A mapped mem/kmem resource 036 */ 036 */ 037 struct kernel_remapped_resource 037 struct kernel_remapped_resource 038 { 038 { 039 int ref_cnt; 039 int ref_cnt; 040 struct sos_umem_vmm_mapped_resource mr; 040 struct sos_umem_vmm_mapped_resource mr; 041 }; 041 }; 042 042 043 043 044 /** Called after the virtual region has been i 044 /** Called after the virtual region has been inserted inside its 045 address space */ 045 address space */ 046 static void resource_ref(struct sos_umem_vmm_v 046 static void resource_ref(struct sos_umem_vmm_vr * vr) 047 { 047 { 048 /* Retrieve the mem/kmem structure associate 048 /* Retrieve the mem/kmem structure associated with the mapped resource */ 049 struct kernel_remapped_resource * resource; 049 struct kernel_remapped_resource * resource; 050 resource 050 resource 051 = (struct kernel_remapped_resource*) 051 = (struct kernel_remapped_resource*) 052 sos_umem_vmm_get_mapped_resource_of_vr(vr) 052 sos_umem_vmm_get_mapped_resource_of_vr(vr)->custom_data; 053 053 054 /* Increment ref counter */ 054 /* Increment ref counter */ 055 resource->ref_cnt ++; 055 resource->ref_cnt ++; 056 } 056 } 057 057 058 058 059 /** Called when the virtual region is removed 059 /** Called when the virtual region is removed from its address 060 space */ 060 space */ 061 static void resource_unref(struct sos_umem_vmm 061 static void resource_unref(struct sos_umem_vmm_vr * vr) 062 { 062 { 063 /* Retrieve the mem/kmem structure associate 063 /* Retrieve the mem/kmem structure associated with the mapped resource */ 064 struct kernel_remapped_resource * resource; 064 struct kernel_remapped_resource * resource; 065 resource 065 resource 066 = (struct kernel_remapped_resource*) 066 = (struct kernel_remapped_resource*) 067 sos_umem_vmm_get_mapped_resource_of_vr(vr) 067 sos_umem_vmm_get_mapped_resource_of_vr(vr)->custom_data; 068 068 069 /* Decrement ref coutner */ 069 /* Decrement ref coutner */ 070 SOS_ASSERT_FATAL(resource->ref_cnt > 0); 070 SOS_ASSERT_FATAL(resource->ref_cnt > 0); 071 resource->ref_cnt --; 071 resource->ref_cnt --; 072 072 073 /* Free the resource if it becomes unused */ 073 /* Free the resource if it becomes unused */ 074 if (resource->ref_cnt == 0) 074 if (resource->ref_cnt == 0) 075 sos_kfree((sos_vaddr_t)resource); 075 sos_kfree((sos_vaddr_t)resource); 076 } 076 } 077 077 078 078 079 /** MOST IMPORTANT callback ! Called when a th 079 /** MOST IMPORTANT callback ! Called when a thread page faults on the 080 resource's mapping */ 080 resource's mapping */ 081 static sos_ret_t kmem_page_in(struct sos_umem_ 081 static sos_ret_t kmem_page_in(struct sos_umem_vmm_vr * vr, 082 sos_uaddr_t uadd 082 sos_uaddr_t uaddr, 083 sos_bool_t write 083 sos_bool_t write_access) 084 { 084 { 085 sos_vaddr_t vaddr; 085 sos_vaddr_t vaddr; 086 sos_ret_t retval = SOS_OK; 086 sos_ret_t retval = SOS_OK; 087 sos_paddr_t ppage_paddr; 087 sos_paddr_t ppage_paddr; 088 088 089 /* Compute address of kernel page */ 089 /* Compute address of kernel page */ 090 vaddr = uaddr - sos_umem_vmm_get_start_of_vr 090 vaddr = uaddr - sos_umem_vmm_get_start_of_vr(vr) 091 + sos_umem_vmm_get_offset_in_resource(vr); 091 + sos_umem_vmm_get_offset_in_resource(vr); 092 092 093 /* Don't allow demand paging of non kernel p 093 /* Don't allow demand paging of non kernel pages */ 094 if (vaddr >= SOS_PAGING_BASE_USER_ADDRESS) 094 if (vaddr >= SOS_PAGING_BASE_USER_ADDRESS) 095 return -SOS_EFAULT; 095 return -SOS_EFAULT; 096 096 097 /* Lookup physical kernel page */ 097 /* Lookup physical kernel page */ 098 ppage_paddr = sos_paging_get_paddr(SOS_PAGE_ 098 ppage_paddr = sos_paging_get_paddr(SOS_PAGE_ALIGN_INF(vaddr)); 099 099 100 /* Cannot access unmapped kernel pages */ 100 /* Cannot access unmapped kernel pages */ 101 if (! ppage_paddr) 101 if (! ppage_paddr) 102 return -SOS_EFAULT; 102 return -SOS_EFAULT; 103 103 104 /* Remap it in user space */ 104 /* Remap it in user space */ 105 retval = sos_paging_map(ppage_paddr, 105 retval = sos_paging_map(ppage_paddr, 106 SOS_PAGE_ALIGN_INF(u 106 SOS_PAGE_ALIGN_INF(uaddr), 107 TRUE, 107 TRUE, 108 sos_umem_vmm_get_pro 108 sos_umem_vmm_get_prot_of_vr(vr)); 109 109 110 return retval; 110 return retval; 111 } 111 } 112 112 113 113 114 /** The callbacks for a mapped kmem resource * 114 /** The callbacks for a mapped kmem resource */ 115 static struct sos_umem_vmm_vr_ops kmem_ops = ( 115 static struct sos_umem_vmm_vr_ops kmem_ops = (struct sos_umem_vmm_vr_ops) 116 { 116 { 117 .ref = resource_ref, 117 .ref = resource_ref, 118 .unref = resource_unref, 118 .unref = resource_unref, 119 .page_in = kmem_page_in, 119 .page_in = kmem_page_in, 120 }; 120 }; 121 121 122 122 123 /** The callback that gets called when the res 123 /** The callback that gets called when the resource gets mapped */ 124 static sos_ret_t kmem_mmap(struct sos_umem_vmm 124 static sos_ret_t kmem_mmap(struct sos_umem_vmm_vr *vr) 125 { 125 { 126 return sos_umem_vmm_set_ops_of_vr(vr, &kmem_ 126 return sos_umem_vmm_set_ops_of_vr(vr, &kmem_ops); 127 } 127 } 128 128 129 129 130 /** The function responsible for mapping the / 130 /** The function responsible for mapping the /dev/kmem resource in 131 user space */ 131 user space */ 132 static 132 static 133 sos_ret_t sos_dev_kmem_map(struct sos_umem_vmm 133 sos_ret_t sos_dev_kmem_map(struct sos_umem_vmm_as * dest_as, 134 sos_uaddr_t *uaddr, 134 sos_uaddr_t *uaddr, 135 sos_size_t size, 135 sos_size_t size, 136 sos_vaddr_t offset, 136 sos_vaddr_t offset, 137 sos_ui32_t access_r 137 sos_ui32_t access_rights, 138 sos_ui32_t flags) 138 sos_ui32_t flags) 139 { 139 { 140 sos_ret_t retval; 140 sos_ret_t retval; 141 struct kernel_remapped_resource * kmem_resou 141 struct kernel_remapped_resource * kmem_resource; 142 142 143 /* Allocate a new "descriptor" for the resou 143 /* Allocate a new "descriptor" for the resource */ 144 kmem_resource 144 kmem_resource 145 = (struct kernel_remapped_resource*) sos_k 145 = (struct kernel_remapped_resource*) sos_kmalloc(sizeof(*kmem_resource), 146 146 0); 147 if (! kmem_resource) 147 if (! kmem_resource) 148 return -SOS_ENOMEM; 148 return -SOS_ENOMEM; 149 149 150 memset(kmem_resource, 0x0, sizeof(*kmem_reso 150 memset(kmem_resource, 0x0, sizeof(*kmem_resource)); 151 kmem_resource->mr.allowed_access_rights 151 kmem_resource->mr.allowed_access_rights 152 = SOS_VM_MAP_PROT_READ 152 = SOS_VM_MAP_PROT_READ 153 | SOS_VM_MAP_PROT_WRITE 153 | SOS_VM_MAP_PROT_WRITE 154 | SOS_VM_MAP_PROT_EXEC; 154 | SOS_VM_MAP_PROT_EXEC; 155 kmem_resource->mr.custom_data = kmem_reso 155 kmem_resource->mr.custom_data = kmem_resource; 156 kmem_resource->mr.mmap = kmem_mmap 156 kmem_resource->mr.mmap = kmem_mmap; 157 157 158 /* Map it in user space */ 158 /* Map it in user space */ 159 retval = sos_umem_vmm_map(dest_as, uaddr, si 159 retval = sos_umem_vmm_map(dest_as, uaddr, size, 160 access_rights, fla 160 access_rights, flags, 161 & kmem_resource->m 161 & kmem_resource->mr, offset); 162 if (SOS_OK != retval) 162 if (SOS_OK != retval) 163 { 163 { 164 sos_kfree((sos_vaddr_t)kmem_resource); 164 sos_kfree((sos_vaddr_t)kmem_resource); 165 return retval; 165 return retval; 166 } 166 } 167 167 168 return SOS_OK; 168 return SOS_OK; 169 } 169 } 170 170 171 171 172 /** MOST IMPORTANT callback ! Called when a th 172 /** MOST IMPORTANT callback ! Called when a thread page faults on the 173 resource's mapping */ 173 resource's mapping */ 174 static sos_ret_t physmem_page_in(struct sos_um 174 static sos_ret_t physmem_page_in(struct sos_umem_vmm_vr * vr, 175 sos_uaddr_t u 175 sos_uaddr_t uaddr, 176 sos_bool_t wr 176 sos_bool_t write_access) 177 { 177 { 178 sos_ret_t retval = SOS_OK; 178 sos_ret_t retval = SOS_OK; 179 sos_paddr_t ppage_paddr; 179 sos_paddr_t ppage_paddr; 180 180 181 /* Compute address of kernel page */ 181 /* Compute address of kernel page */ 182 ppage_paddr = uaddr - sos_umem_vmm_get_start 182 ppage_paddr = uaddr - sos_umem_vmm_get_start_of_vr(vr) 183 + sos_umem_vmm_get_offset_in_resource(vr); 183 + sos_umem_vmm_get_offset_in_resource(vr); 184 184 185 /* Remap page in user space */ 185 /* Remap page in user space */ 186 retval = sos_paging_map(SOS_PAGE_ALIGN_INF(p 186 retval = sos_paging_map(SOS_PAGE_ALIGN_INF(ppage_paddr), 187 SOS_PAGE_ALIGN_INF(u 187 SOS_PAGE_ALIGN_INF(uaddr), 188 TRUE, 188 TRUE, 189 sos_umem_vmm_get_pro 189 sos_umem_vmm_get_prot_of_vr(vr)); 190 return retval; 190 return retval; 191 } 191 } 192 192 193 193 194 /** The callbacks for a mapped physmem resourc 194 /** The callbacks for a mapped physmem resource */ 195 static struct sos_umem_vmm_vr_ops physmem_ops 195 static struct sos_umem_vmm_vr_ops physmem_ops = (struct sos_umem_vmm_vr_ops) 196 { 196 { 197 .ref = resource_ref, 197 .ref = resource_ref, 198 .unref = resource_unref, 198 .unref = resource_unref, 199 .page_in = physmem_page_in, 199 .page_in = physmem_page_in, 200 }; 200 }; 201 201 202 202 203 /** The callback that gets called when the res 203 /** The callback that gets called when the resource gets mapped */ 204 static sos_ret_t physmem_mmap(struct sos_umem_ 204 static sos_ret_t physmem_mmap(struct sos_umem_vmm_vr *vr) 205 { 205 { 206 return sos_umem_vmm_set_ops_of_vr(vr, &physm 206 return sos_umem_vmm_set_ops_of_vr(vr, &physmem_ops); 207 } 207 } 208 208 209 209 210 /** The function responsible for mapping the / 210 /** The function responsible for mapping the /dev/mem resource in 211 user space */ 211 user space */ 212 static 212 static 213 sos_ret_t sos_dev_physmem_map(struct sos_umem_ 213 sos_ret_t sos_dev_physmem_map(struct sos_umem_vmm_as * dest_as, 214 sos_uaddr_t *uad 214 sos_uaddr_t *uaddr, 215 sos_size_t size, 215 sos_size_t size, 216 sos_paddr_t offs 216 sos_paddr_t offset, 217 sos_ui32_t acces 217 sos_ui32_t access_rights, 218 sos_ui32_t flags 218 sos_ui32_t flags) 219 { 219 { 220 sos_ret_t retval; 220 sos_ret_t retval; 221 struct kernel_remapped_resource * physmem_re 221 struct kernel_remapped_resource * physmem_resource; 222 222 223 physmem_resource 223 physmem_resource 224 = (struct kernel_remapped_resource*) sos_k 224 = (struct kernel_remapped_resource*) sos_kmalloc(sizeof(*physmem_resource), 225 225 0); 226 if (! physmem_resource) 226 if (! physmem_resource) 227 return -SOS_ENOMEM; 227 return -SOS_ENOMEM; 228 228 229 memset(physmem_resource, 0x0, sizeof(*physme 229 memset(physmem_resource, 0x0, sizeof(*physmem_resource)); 230 physmem_resource->mr.allowed_access_rights 230 physmem_resource->mr.allowed_access_rights 231 = SOS_VM_MAP_PROT_READ 231 = SOS_VM_MAP_PROT_READ 232 | SOS_VM_MAP_PROT_WRITE 232 | SOS_VM_MAP_PROT_WRITE 233 | SOS_VM_MAP_PROT_EXEC; 233 | SOS_VM_MAP_PROT_EXEC; 234 physmem_resource->mr.custom_data = physme 234 physmem_resource->mr.custom_data = physmem_resource; 235 physmem_resource->mr.mmap = physme 235 physmem_resource->mr.mmap = physmem_mmap; 236 236 237 retval = sos_umem_vmm_map(dest_as, uaddr, si 237 retval = sos_umem_vmm_map(dest_as, uaddr, size, 238 access_rights, fla 238 access_rights, flags, 239 & physmem_resource 239 & physmem_resource->mr, offset); 240 if (SOS_OK != retval) 240 if (SOS_OK != retval) 241 { 241 { 242 sos_kfree((sos_vaddr_t)physmem_resource) 242 sos_kfree((sos_vaddr_t)physmem_resource); 243 return retval; 243 return retval; 244 } 244 } 245 245 246 return SOS_OK; 246 return SOS_OK; 247 } 247 } 248 248 249 249 250 /* 250 /* 251 * /dev/mem and /dev/kmem character device ope 251 * /dev/mem and /dev/kmem character device operations 252 * 252 * 253 * the "custom_data" field of the FS node is u 253 * the "custom_data" field of the FS node is used to store the total 254 * number of pages available 254 * number of pages available 255 */ 255 */ 256 #define GET_DEV_SIZE(fsnode) \ 256 #define GET_DEV_SIZE(fsnode) \ 257 ((sos_size_t)(fsnode)->custom_data) 257 ((sos_size_t)(fsnode)->custom_data) 258 258 259 static sos_ret_t dev_mem_fs_open(struct sos_fs 259 static sos_ret_t dev_mem_fs_open(struct sos_fs_node * fsnode, 260 struct sos_fs 260 struct sos_fs_opened_file * of, 261 void * charde 261 void * chardev_class_custom_data) 262 { 262 { 263 /* Make sure the device is supported by this 263 /* Make sure the device is supported by this driver and compute its 264 "size" (use the custom_data field to stor 264 "size" (use the custom_data field to store it) */ 265 switch (fsnode->dev_id.device_instance) 265 switch (fsnode->dev_id.device_instance) 266 { 266 { 267 /* For /dev/kmem, go to the end of the k 267 /* For /dev/kmem, go to the end of the kernel mapping */ 268 case SOS_CHARDEV_KMEM_MINOR: 268 case SOS_CHARDEV_KMEM_MINOR: 269 fsnode->custom_data = (void*)SOS_PAGING_ 269 fsnode->custom_data = (void*)SOS_PAGING_BASE_USER_ADDRESS; 270 return SOS_OK; 270 return SOS_OK; 271 break; 271 break; 272 272 273 /* For /dev/mem, go to the end of physic 273 /* For /dev/mem, go to the end of physical memory */ 274 case SOS_CHARDEV_PHYSMEM_MINOR: 274 case SOS_CHARDEV_PHYSMEM_MINOR: 275 { 275 { 276 sos_size_t ram_pages = 0; 276 sos_size_t ram_pages = 0; 277 sos_physmem_get_state(& ram_pages, NUL 277 sos_physmem_get_state(& ram_pages, NULL); 278 fsnode->custom_data = (void*)(ram_page 278 fsnode->custom_data = (void*)(ram_pages << SOS_PAGE_SHIFT); 279 } 279 } 280 return SOS_OK; 280 return SOS_OK; 281 break; 281 break; 282 282 283 default: 283 default: 284 break; 284 break; 285 } 285 } 286 286 287 return -SOS_ENODEV; 287 return -SOS_ENODEV; 288 } 288 } 289 289 290 290 291 static sos_ret_t dev_mem_fs_seek(struct sos_fs 291 static sos_ret_t dev_mem_fs_seek(struct sos_fs_opened_file *this, 292 sos_lsoffset_ 292 sos_lsoffset_t offset, 293 sos_seek_when 293 sos_seek_whence_t whence, 294 /* out */ sos 294 /* out */ sos_lsoffset_t * result_position) 295 { 295 { 296 /* Make sure the device is supported by this 296 /* Make sure the device is supported by this driver */ 297 struct sos_fs_node * fsnode = sos_fs_nscache 297 struct sos_fs_node * fsnode = sos_fs_nscache_get_fs_node(this->direntry); 298 298 299 /* Artificiallly update the position in the 299 /* Artificiallly update the position in the "file" */ 300 sos_lsoffset_t ref_offs; 300 sos_lsoffset_t ref_offs; 301 sos_lsoffset_t dev_size = GET_DEV_SIZE(fsnod 301 sos_lsoffset_t dev_size = GET_DEV_SIZE(fsnode); 302 302 303 *result_position = this->position; 303 *result_position = this->position; 304 switch (whence) 304 switch (whence) 305 { 305 { 306 case SOS_SEEK_SET: 306 case SOS_SEEK_SET: 307 ref_offs = 0; 307 ref_offs = 0; 308 break; 308 break; 309 309 310 case SOS_SEEK_CUR: 310 case SOS_SEEK_CUR: 311 ref_offs = this->position; 311 ref_offs = this->position; 312 break; 312 break; 313 313 314 case SOS_SEEK_END: 314 case SOS_SEEK_END: 315 ref_offs = dev_size; 315 ref_offs = dev_size; 316 break; 316 break; 317 317 318 default: 318 default: 319 return -SOS_EINVAL; 319 return -SOS_EINVAL; 320 } 320 } 321 321 322 /* Forbid accesses "before" the start of the 322 /* Forbid accesses "before" the start of the device */ 323 if (offset < -ref_offs) 323 if (offset < -ref_offs) 324 return -SOS_EINVAL; 324 return -SOS_EINVAL; 325 325 326 /* Forbid accesses "after" the end of the de 326 /* Forbid accesses "after" the end of the device */ 327 else if (ref_offs + offset > dev_size) 327 else if (ref_offs + offset > dev_size) 328 return -SOS_EINVAL; 328 return -SOS_EINVAL; 329 329 330 this->position = ref_offs + offset; 330 this->position = ref_offs + offset; 331 *result_position = this->position; 331 *result_position = this->position; 332 return SOS_OK; 332 return SOS_OK; 333 } 333 } 334 334 335 335 336 typedef enum { DO_READ, DO_WRITE } dev_mem_acc 336 typedef enum { DO_READ, DO_WRITE } dev_mem_access_type_t; 337 static sos_ret_t dev_mem_fs_access(struct sos_ 337 static sos_ret_t dev_mem_fs_access(struct sos_fs_opened_file *this, 338 sos_uaddr_t 338 sos_uaddr_t user_buf, 339 sos_size_t 339 sos_size_t * /* in/out */len, 340 dev_mem_acc 340 dev_mem_access_type_t access_type) 341 { 341 { 342 struct sos_fs_node * fsnode = sos_fs_nscache 342 struct sos_fs_node * fsnode = sos_fs_nscache_get_fs_node(this->direntry); 343 sos_vaddr_t physmem_transfer_kernel_page = 343 sos_vaddr_t physmem_transfer_kernel_page = 0; /* Used for /dev/mem only */ 344 sos_uoffset_t offs; 344 sos_uoffset_t offs; 345 sos_size_t accesslen = 0; 345 sos_size_t accesslen = 0; 346 346 347 /* Readjust copy length to match the size of 347 /* Readjust copy length to match the size of the device */ 348 if (this->position + *len >= GET_DEV_SIZE(fs 348 if (this->position + *len >= GET_DEV_SIZE(fsnode)) 349 *len = GET_DEV_SIZE(fsnode) - this->positi 349 *len = GET_DEV_SIZE(fsnode) - this->position; 350 350 351 /* Ignore zero-size requests */ 351 /* Ignore zero-size requests */ 352 if (*len <= 0) 352 if (*len <= 0) 353 return SOS_OK; 353 return SOS_OK; 354 354 355 /* For /dev/mem device, prepare a kernel pag 355 /* For /dev/mem device, prepare a kernel page to copy the physical 356 pages before transferring to user space * 356 pages before transferring to user space */ 357 if (SOS_CHARDEV_PHYSMEM_MINOR == fsnode->dev 357 if (SOS_CHARDEV_PHYSMEM_MINOR == fsnode->dev_id.device_instance) 358 { 358 { 359 physmem_transfer_kernel_page = sos_kmem_ 359 physmem_transfer_kernel_page = sos_kmem_vmm_alloc(1, 0); 360 if (! physmem_transfer_kernel_page) 360 if (! physmem_transfer_kernel_page) 361 return -SOS_ENOMEM; 361 return -SOS_ENOMEM; 362 } 362 } 363 363 364 /* Try to copy the data in page-size chunks 364 /* Try to copy the data in page-size chunks */ 365 offs = this->position; 365 offs = this->position; 366 while (offs < this->position + *len) 366 while (offs < this->position + *len) 367 { 367 { 368 /* Retrieve page address of data in kern 368 /* Retrieve page address of data in kernel memory */ 369 sos_uoffset_t page_boundary = SOS_PAGE_A 369 sos_uoffset_t page_boundary = SOS_PAGE_ALIGN_INF(offs); 370 sos_vaddr_t page_vaddr; 370 sos_vaddr_t page_vaddr; 371 sos_uoffset_t offset_in_page; 371 sos_uoffset_t offset_in_page; 372 sos_uoffset_t accesslen_in_page; 372 sos_uoffset_t accesslen_in_page; 373 sos_ret_t retval; 373 sos_ret_t retval; 374 374 375 /* For /dev/mem device, we need to map t 375 /* For /dev/mem device, we need to map the page in kernel memory 376 before */ 376 before */ 377 if (SOS_CHARDEV_PHYSMEM_MINOR == fsnode- 377 if (SOS_CHARDEV_PHYSMEM_MINOR == fsnode->dev_id.device_instance) 378 { 378 { 379 retval = sos_paging_map(page_boundar 379 retval = sos_paging_map(page_boundary, 380 physmem_tran 380 physmem_transfer_kernel_page, 381 FALSE, 381 FALSE, 382 (access_type 382 (access_type==DO_WRITE)? 383 SOS_VM_MAP 383 SOS_VM_MAP_PROT_WRITE 384 :SOS_VM_MA 384 :SOS_VM_MAP_PROT_READ); 385 if (SOS_OK != retval) 385 if (SOS_OK != retval) 386 break; 386 break; 387 387 388 page_vaddr = physmem_transfer_kernel 388 page_vaddr = physmem_transfer_kernel_page; 389 } 389 } 390 /* For /dev/kmem device, the page should 390 /* For /dev/kmem device, the page should already be in kernel space */ 391 else if (! sos_kmem_vmm_is_valid_vaddr(p 391 else if (! sos_kmem_vmm_is_valid_vaddr(page_boundary)) 392 break; /* No: page is not mapped in ke 392 break; /* No: page is not mapped in kernel space ! */ 393 else 393 else 394 page_vaddr = page_boundary; /* Yes, pa 394 page_vaddr = page_boundary; /* Yes, page is mapped */ 395 395 396 /* Now copy the data from kernel to user 396 /* Now copy the data from kernel to user space */ 397 offset_in_page = offs - page_boundary; 397 offset_in_page = offs - page_boundary; 398 accesslen_in_page = SOS_PAGE_SIZE - off 398 accesslen_in_page = SOS_PAGE_SIZE - offset_in_page; 399 if (accesslen + accesslen_in_page > *len 399 if (accesslen + accesslen_in_page > *len) 400 accesslen_in_page = *len - accesslen; 400 accesslen_in_page = *len - accesslen; 401 401 402 if (access_type==DO_WRITE) 402 if (access_type==DO_WRITE) 403 retval = sos_memcpy_from_user(page_vad 403 retval = sos_memcpy_from_user(page_vaddr + offset_in_page, 404 user_buf 404 user_buf + accesslen, 405 accessle 405 accesslen_in_page); 406 else 406 else 407 retval = sos_memcpy_to_user(user_buf + 407 retval = sos_memcpy_to_user(user_buf + accesslen, 408 page_vaddr 408 page_vaddr + offset_in_page, 409 accesslen_ 409 accesslen_in_page); 410 410 411 /* Now, for /dev/mem, unmap the page fro 411 /* Now, for /dev/mem, unmap the page from kernel */ 412 if (SOS_CHARDEV_PHYSMEM_MINOR == fsnode- 412 if (SOS_CHARDEV_PHYSMEM_MINOR == fsnode->dev_id.device_instance) 413 sos_paging_unmap(physmem_transfer_kern 413 sos_paging_unmap(physmem_transfer_kernel_page); 414 414 415 /* Go to next page if possible */ 415 /* Go to next page if possible */ 416 if (retval < 0) 416 if (retval < 0) 417 break; 417 break; 418 418 419 accesslen += retval; 419 accesslen += retval; 420 /* If transfer was interrupted, stop her 420 /* If transfer was interrupted, stop here */ 421 if (retval < (sos_ret_t)accesslen_in_pag !! 421 if (retval < accesslen_in_page) 422 break; 422 break; 423 423 424 /* Go on to next page */ 424 /* Go on to next page */ 425 offs = page_boundary + SOS_PAGE_SIZE; 425 offs = page_boundary + SOS_PAGE_SIZE; 426 } 426 } 427 427 428 /* Release the temporary page for physical m 428 /* Release the temporary page for physical mem transfers */ 429 if (SOS_CHARDEV_PHYSMEM_MINOR == fsnode->dev 429 if (SOS_CHARDEV_PHYSMEM_MINOR == fsnode->dev_id.device_instance) 430 sos_kmem_vmm_free(physmem_transfer_kernel_ 430 sos_kmem_vmm_free(physmem_transfer_kernel_page); 431 431 432 /* Update the position in the "file" */ 432 /* Update the position in the "file" */ 433 *len = accesslen; 433 *len = accesslen; 434 this->position += accesslen; 434 this->position += accesslen; 435 return SOS_OK; 435 return SOS_OK; 436 } 436 } 437 437 438 438 439 static sos_ret_t dev_mem_fs_read(struct sos_fs 439 static sos_ret_t dev_mem_fs_read(struct sos_fs_opened_file *this, 440 sos_uaddr_t 440 sos_uaddr_t dest_buf, 441 sos_size_t 441 sos_size_t * /* in/out */len) 442 { 442 { 443 return dev_mem_fs_access(this, dest_buf, len 443 return dev_mem_fs_access(this, dest_buf, len, DO_READ); 444 } 444 } 445 445 446 446 447 static sos_ret_t dev_mem_fs_write(struct sos_f 447 static sos_ret_t dev_mem_fs_write(struct sos_fs_opened_file *this, 448 sos_uaddr_t 448 sos_uaddr_t src_buf, 449 sos_size_t * 449 sos_size_t * /* in/out */len) 450 { 450 { 451 return dev_mem_fs_access(this, src_buf, len, 451 return dev_mem_fs_access(this, src_buf, len, DO_WRITE); 452 } 452 } 453 453 454 454 455 static sos_ret_t dev_mem_fs_mmap(struct sos_fs 455 static sos_ret_t dev_mem_fs_mmap(struct sos_fs_opened_file *this, 456 sos_uaddr_t * 456 sos_uaddr_t *uaddr, sos_size_t size, 457 sos_ui32_t ac 457 sos_ui32_t access_rights, 458 sos_ui32_t fl 458 sos_ui32_t flags, 459 sos_luoffset_ 459 sos_luoffset_t offset) 460 { 460 { 461 struct sos_fs_node * fsnode = sos_fs_nscache 461 struct sos_fs_node * fsnode = sos_fs_nscache_get_fs_node(this->direntry); 462 if (SOS_CHARDEV_PHYSMEM_MINOR == fsnode->dev 462 if (SOS_CHARDEV_PHYSMEM_MINOR == fsnode->dev_id.device_instance) 463 return sos_dev_physmem_map(sos_process_get 463 return sos_dev_physmem_map(sos_process_get_address_space(this->owner), 464 uaddr, size, of 464 uaddr, size, offset, access_rights, flags); 465 465 466 return sos_dev_kmem_map(sos_process_get_addr 466 return sos_dev_kmem_map(sos_process_get_address_space(this->owner), 467 uaddr, size, offset, 467 uaddr, size, offset, access_rights, flags); 468 } 468 } 469 469 470 470 471 static struct sos_chardev_ops dev_mem_fs_ops 471 static struct sos_chardev_ops dev_mem_fs_ops 472 = (struct sos_chardev_ops) { 472 = (struct sos_chardev_ops) { 473 .open = dev_mem_fs_open, 473 .open = dev_mem_fs_open, 474 .close = NULL, 474 .close = NULL, 475 .seek = dev_mem_fs_seek, 475 .seek = dev_mem_fs_seek, 476 .read = dev_mem_fs_read, 476 .read = dev_mem_fs_read, 477 .write = dev_mem_fs_write, 477 .write = dev_mem_fs_write, 478 .mmap = dev_mem_fs_mmap, 478 .mmap = dev_mem_fs_mmap, 479 .fcntl = NULL, 479 .fcntl = NULL, 480 .ioctl = NULL 480 .ioctl = NULL 481 }; 481 }; 482 482 483 483 484 sos_ret_t sos_dev_mem_chardev_setup() 484 sos_ret_t sos_dev_mem_chardev_setup() 485 { 485 { 486 return sos_chardev_register_class(SOS_CHARDE 486 return sos_chardev_register_class(SOS_CHARDEV_MEM_MAJOR, 487 & dev_mem_ 487 & dev_mem_fs_ops, 488 NULL); 488 NULL); 489 } 489 }
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