| 1 | /*- |
| 2 | * Copyright (c) 1997 Helmut Wirth <hfwirth@ping.at> |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice immediately at the beginning of the file, witout modification, |
| 10 | * this list of conditions, and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * 3. The name of the author may not be used to endorse or promote products |
| 15 | * derived from this software without specific prior written permission. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | * |
| 28 | * $FreeBSD: src/usr.bin/doscmd/ems.c,v 1.3.2.2 2002/04/25 11:04:51 tg Exp $ |
| 29 | * $DragonFly: src/usr.bin/doscmd/ems.c,v 1.4 2005/10/30 23:00:57 swildner Exp $ |
| 30 | */ |
| 31 | |
| 32 | /* |
| 33 | * EMS memory emulation |
| 34 | * |
| 35 | * To emulate Expanded Memory we use a DOS driver (emsdriv.sys) which |
| 36 | * routes calls to int 0x67 to this emulator routine. The main entry point |
| 37 | * is ems_entry(..). The emulator needs to be initialized before the first |
| 38 | * call. The first step of the initialization is done during program startup |
| 39 | * the second part is done during DOS boot, from a call of the DOS driver. |
| 40 | * The DOS driver is neccessary because DOS programs look for it to |
| 41 | * determine if EMS is available. |
| 42 | * |
| 43 | * To emulate a configurable amount of EMS memory we use a file created |
| 44 | * at startup with the size of the configured EMS memory. This file is |
| 45 | * mapped into the EMS window like any DOS memory manager would do, using |
| 46 | * mmap calls. |
| 47 | * |
| 48 | * The emulation follows the LIM EMS 4.0 standard. Not all functions of it |
| 49 | * are implemented yet. The "alter page map and jump" and "alter page map |
| 50 | * and call" functions are not implemented, because they are rather hard to |
| 51 | * do. (It would mean a call to the emulator executes a routine in EMS |
| 52 | * memory and returns to the emulator, the emulator switches the page map |
| 53 | * and then returns to the DOS program.) LINUX does not emulate this |
| 54 | * functions and I think they were very rarely used by DOS applications. |
| 55 | * |
| 56 | * Credits: To the writers of LINUX dosemu, I looked at their code |
| 57 | */ |
| 58 | |
| 59 | #include <sys/types.h> |
| 60 | #include <sys/param.h> |
| 61 | #include <sys/mman.h> |
| 62 | #include <unistd.h> |
| 63 | |
| 64 | #include "doscmd.h" |
| 65 | #include "ems.h" |
| 66 | |
| 67 | /* Will be configurable */ |
| 68 | u_long ems_max_size = EMS_MAXSIZE * 1024; |
| 69 | u_long ems_frame_addr = EMS_FRAME_ADDR; |
| 70 | |
| 71 | /* |
| 72 | * Method for EMS: Allocate a mapfile with the size of EMS memory |
| 73 | * and map the needed part into the page frame |
| 74 | */ |
| 75 | |
| 76 | #define EMS_MAP_PATH "/var/tmp/" /* Use a big file system */ |
| 77 | #define EMS_MAP_FILE "doscmd.XXXXXX" |
| 78 | static int mapfile_fd = -1; |
| 79 | |
| 80 | /* Pages are always 16 kB in size. The page frame is 64 kB, there are |
| 81 | * 4 positions (0..3) for a page to map in. The pages are numbered from 0 to |
| 82 | * the highest 16 kB page in the mapfile, depending on the EMS size |
| 83 | */ |
| 84 | |
| 85 | EMS_mapping_context ems_mapping_context; |
| 86 | |
| 87 | /* Handle and page management (see ems.h) */ |
| 88 | |
| 89 | /* The handle array. If the pointer is NULL, the handle is unallocated */ |
| 90 | static EMS_handle *ems_handle[EMS_NUM_HANDLES]; |
| 91 | static u_long ems_alloc_handles; |
| 92 | /* The active handle, if any */ |
| 93 | static short active_handle; |
| 94 | |
| 95 | /* The page array. It is malloced at runtime, depending on the total |
| 96 | * allocation size |
| 97 | */ |
| 98 | |
| 99 | static EMS_page *ems_page = NULL; |
| 100 | static u_long ems_total_pages; |
| 101 | static u_long ems_alloc_pages; |
| 102 | static u_long ems_free_pages; |
| 103 | |
| 104 | /* Local structure used for region copy and move operations */ |
| 105 | |
| 106 | struct copydesc { |
| 107 | #define SRC_EMS 1 |
| 108 | #define DST_EMS 2 |
| 109 | short copytype; /* Type of source and destination memory */ |
| 110 | EMS_addr src_addr; /* Combined pointer for source */ |
| 111 | EMS_addr dst_addr; /* Combined pointer for destination */ |
| 112 | u_long rest_len; /* Lenght to copy */ |
| 113 | }; |
| 114 | |
| 115 | |
| 116 | /* Local prototypes */ |
| 117 | static int init_mapfile(void); |
| 118 | static void map_page(u_long, u_char, short, int); |
| 119 | static EMS_handle *get_new_handle(long); |
| 120 | static void context_to_handle(short); |
| 121 | static long find_next_free_handle(void); |
| 122 | static short lookup_handle(Hname *hp); |
| 123 | static void allocate_pages_to_handle(u_short, long); |
| 124 | static void allocate_handle(short, long); |
| 125 | static void reallocate_pages_to_handle(u_short, long); |
| 126 | static void free_handle(short); |
| 127 | static void free_pages_of_handle(short); |
| 128 | static void restore_context(EMS_mapping_context *); |
| 129 | static void save_context_to_dos(EMScontext *); |
| 130 | static int check_saved_context(EMScontext *); |
| 131 | static void *get_valid_pointer(u_short, u_short, u_long); |
| 132 | static u_long move_ems_to_conv(short, u_short, u_short, u_long, u_long); |
| 133 | static u_long move_conv_to_ems(u_long, u_short, u_short, u_short, u_long); |
| 134 | static u_long move_ems_to_ems(u_short, u_short, u_short, u_short, |
| 135 | u_short, u_short, u_long); |
| 136 | |
| 137 | /* |
| 138 | * EMS initialization routine: Return 1, if successful, return 0 if |
| 139 | * init problem or EMS disabled |
| 140 | */ |
| 141 | |
| 142 | int |
| 143 | ems_init(void) |
| 144 | { |
| 145 | unsigned i; |
| 146 | |
| 147 | if (ems_max_size == 0) |
| 148 | return 0; |
| 149 | if (init_mapfile() == 0) |
| 150 | return 0; |
| 151 | /* Sanity */ |
| 152 | bzero((void *)(&ems_handle[0]), sizeof(ems_handle)); |
| 153 | ems_total_pages = ems_max_size / EMS_PAGESIZE; |
| 154 | ems_alloc_pages = 0; |
| 155 | ems_free_pages = ems_total_pages; |
| 156 | ems_alloc_handles = 0; |
| 157 | active_handle = 0; |
| 158 | /* Malloc the page array */ |
| 159 | ems_page = (EMS_page *)malloc(sizeof(EMS_page) * ems_total_pages); |
| 160 | if (ems_page == NULL) { |
| 161 | debug(D_ALWAYS, "Could not malloc page array, EMS disabled\n"); |
| 162 | ems_frame_addr = 0; |
| 163 | ems_max_size = 0; |
| 164 | ems_total_pages = 0; |
| 165 | return 0; |
| 166 | } |
| 167 | for (i = 0; i < ems_total_pages; i++) { |
| 168 | ems_page[i].handle = 0; |
| 169 | ems_page[i].status = EMS_FREE; |
| 170 | } |
| 171 | debug(D_EMS, "EMS: Emulation init OK.\n"); |
| 172 | return 1; |
| 173 | } |
| 174 | |
| 175 | |
| 176 | /* Main entry point */ |
| 177 | |
| 178 | void |
| 179 | ems_entry(regcontext_t *REGS) |
| 180 | { |
| 181 | /* |
| 182 | * If EMS is not enabled, the DOS ems.exe module should not have |
| 183 | * been loaded. If it is loaded anyway, report software malfunction |
| 184 | */ |
| 185 | if (ems_max_size == 0) { |
| 186 | R_AH = EMS_SW_MALFUNC; |
| 187 | debug(D_EMS, "EMS emulation not enabled\n"); |
| 188 | return; |
| 189 | } |
| 190 | |
| 191 | switch (R_AH) |
| 192 | { |
| 193 | case GET_MANAGER_STATUS: |
| 194 | debug(D_EMS, "EMS: Get manager status\n"); |
| 195 | R_AH = EMS_SUCCESS; |
| 196 | break; |
| 197 | |
| 198 | case GET_PAGE_FRAME_SEGMENT: |
| 199 | debug(D_EMS, "EMS: Get page frame segment\n"); |
| 200 | R_BX = ems_frame_addr >> 4; |
| 201 | R_AH = EMS_SUCCESS; |
| 202 | break; |
| 203 | |
| 204 | case GET_PAGE_COUNTS: |
| 205 | R_BX = ems_total_pages - ems_alloc_pages; |
| 206 | R_DX = ems_total_pages; |
| 207 | debug(D_EMS, "EMS: Get page count: Returned total=%d, free=%d\n", |
| 208 | R_DX, R_BX); |
| 209 | R_AH = EMS_SUCCESS; |
| 210 | break; |
| 211 | |
| 212 | case GET_HANDLE_AND_ALLOCATE: |
| 213 | { |
| 214 | u_short npages; |
| 215 | short handle; |
| 216 | |
| 217 | npages = R_BX; |
| 218 | debug(D_EMS, "EMS: Get handle and allocate %d pages: ", npages); |
| 219 | |
| 220 | /* Enough handles? */ |
| 221 | if ((handle = find_next_free_handle()) < 0) { |
| 222 | debug(D_EMS,"Return error:No handles\n"); |
| 223 | R_AH = EMS_OUT_OF_HANDLES; |
| 224 | break; |
| 225 | } |
| 226 | /* Enough memory for this request ? */ |
| 227 | if (npages > ems_free_pages) { |
| 228 | debug(D_EMS,"Return error:Request too big\n"); |
| 229 | R_AH = EMS_OUT_OF_LOG; |
| 230 | break; |
| 231 | } |
| 232 | if (npages > ems_total_pages) { |
| 233 | debug(D_EMS,"Return error:Request too big\n"); |
| 234 | R_AH = EMS_OUT_OF_PHYS; |
| 235 | break; |
| 236 | } |
| 237 | /* Not allowed to allocate zero pages with this function */ |
| 238 | if (npages == 0) { |
| 239 | debug(D_EMS,"Return error:Cannot allocate 0 pages\n"); |
| 240 | R_AH = EMS_ZERO_PAGES; |
| 241 | break; |
| 242 | } |
| 243 | /* Allocate the handle */ |
| 244 | allocate_handle(handle, npages); |
| 245 | |
| 246 | /* Allocate the pages */ |
| 247 | allocate_pages_to_handle(handle, npages); |
| 248 | R_DX = handle; |
| 249 | R_AH = EMS_SUCCESS; |
| 250 | debug(D_EMS,"Return success:Handle = %d\n", handle); |
| 251 | break; |
| 252 | } |
| 253 | |
| 254 | case MAP_UNMAP: |
| 255 | { |
| 256 | u_char position; |
| 257 | u_short hpagenum, spagenum; |
| 258 | short handle; |
| 259 | |
| 260 | debug(D_EMS, "EMS: Map/Unmap handle=%d, pos=%d, pagenum=%d ", |
| 261 | R_DX, R_AL, R_BX); |
| 262 | handle = R_DX; |
| 263 | position = R_AL; |
| 264 | if (position > 3) { |
| 265 | debug(D_EMS, "invalid position\n"); |
| 266 | R_AH = EMS_ILL_PHYS; |
| 267 | break; |
| 268 | } |
| 269 | hpagenum = R_BX; |
| 270 | /* This succeeds without a valid handle ! */ |
| 271 | if (hpagenum == 0xffff) { |
| 272 | /* Unmap only */ |
| 273 | map_page(0, position, handle, 1); |
| 274 | debug(D_EMS, "(unmap only) success\n"); |
| 275 | R_AH = EMS_SUCCESS; |
| 276 | break; |
| 277 | } |
| 278 | if (handle > 255 || handle == 0 || ems_handle[handle] == NULL) { |
| 279 | R_AH = EMS_INV_HANDLE; |
| 280 | debug(D_EMS, "invalid handle\n"); |
| 281 | break; |
| 282 | } |
| 283 | if (hpagenum >= ems_handle[handle]->npages) { |
| 284 | R_AH = EMS_LOGPAGE_TOOBIG; |
| 285 | debug(D_EMS, "invalid pagenumber\n"); |
| 286 | break; |
| 287 | } |
| 288 | spagenum = ems_handle[handle]->pagenum[hpagenum]; |
| 289 | map_page(spagenum, position, handle, 0); |
| 290 | debug(D_EMS, "success\n"); |
| 291 | R_AH = EMS_SUCCESS; |
| 292 | break; |
| 293 | } |
| 294 | |
| 295 | case DEALLOCATE_HANDLE: |
| 296 | { |
| 297 | short handle; |
| 298 | |
| 299 | /* Handle valid ? */ |
| 300 | handle = R_DX; |
| 301 | debug(D_EMS, "EMS: Deallocate handle %d\n", handle); |
| 302 | if (handle > 255 || ems_handle[handle] == NULL) { |
| 303 | R_AH = EMS_INV_HANDLE; |
| 304 | break; |
| 305 | } |
| 306 | /* Mapping context saved ? */ |
| 307 | if (ems_handle[handle]->mcontext != NULL) { |
| 308 | R_AH = EMS_SAVED_MAP; |
| 309 | break; |
| 310 | } |
| 311 | |
| 312 | free_pages_of_handle(handle); |
| 313 | free_handle(handle); |
| 314 | R_AH = EMS_SUCCESS; |
| 315 | break; |
| 316 | } |
| 317 | |
| 318 | case GET_EMM_VERSION: |
| 319 | debug(D_EMS, "EMS: Get version\n"); |
| 320 | R_AL = EMS_VERSION; |
| 321 | R_AH = EMS_SUCCESS; |
| 322 | break; |
| 323 | |
| 324 | case SAVE_PAGE_MAP: |
| 325 | { |
| 326 | short handle; |
| 327 | |
| 328 | debug(D_EMS, "EMS: Save page map\n"); |
| 329 | handle = R_DX; |
| 330 | if (handle > 255 || handle == 0 || ems_handle[handle] == NULL) { |
| 331 | R_AH = EMS_INV_HANDLE; |
| 332 | break; |
| 333 | } |
| 334 | if (ems_handle[handle]->mcontext != NULL) { |
| 335 | /* There is already a context saved */ |
| 336 | if (memcmp((void *)ems_handle[handle]->mcontext, |
| 337 | (void *)&ems_mapping_context, |
| 338 | sizeof(EMS_mapping_context)) == 0) |
| 339 | R_AH = EMS_ALREADY_SAVED; |
| 340 | else |
| 341 | R_AH = EMS_NO_ROOM_TO_SAVE; |
| 342 | break; |
| 343 | } |
| 344 | context_to_handle(handle); |
| 345 | R_AH = EMS_SUCCESS; |
| 346 | break; |
| 347 | } |
| 348 | |
| 349 | case RESTORE_PAGE_MAP: |
| 350 | { |
| 351 | short handle; |
| 352 | |
| 353 | debug(D_EMS, "EMS: Restore page map\n"); |
| 354 | handle = R_DX; |
| 355 | if (handle > 255 || handle == 0 || ems_handle[handle] == NULL) { |
| 356 | R_AH = EMS_INV_HANDLE; |
| 357 | break; |
| 358 | } |
| 359 | if (ems_handle[handle]->mcontext == NULL) { |
| 360 | R_AH = EMS_NO_SAVED_CONTEXT; |
| 361 | break; |
| 362 | } |
| 363 | restore_context(ems_handle[handle]->mcontext); |
| 364 | free((void *)ems_handle[handle]->mcontext); |
| 365 | ems_handle[handle]->mcontext = NULL; |
| 366 | R_AH = EMS_SUCCESS; |
| 367 | break; |
| 368 | } |
| 369 | |
| 370 | case RESERVED_1: |
| 371 | case RESERVED_2: |
| 372 | debug(D_ALWAYS, "Reserved function called: %02x\n", R_AH); |
| 373 | R_AH = EMS_FUNC_NOSUP; |
| 374 | break; |
| 375 | |
| 376 | case GET_HANDLE_COUNT: |
| 377 | debug(D_EMS, "EMS: Get handle count\n"); |
| 378 | R_BX = ems_alloc_handles + 1; |
| 379 | R_AH = EMS_SUCCESS; |
| 380 | break; |
| 381 | |
| 382 | case GET_PAGES_OWNED: |
| 383 | { |
| 384 | short handle; |
| 385 | |
| 386 | debug(D_EMS, "EMS: Get pages owned\n"); |
| 387 | /* Handle valid ? */ |
| 388 | handle = R_DX; |
| 389 | if (handle > 255 || ems_handle[handle] == NULL) { |
| 390 | R_AH = EMS_INV_HANDLE; |
| 391 | break; |
| 392 | } |
| 393 | if (handle == 0) |
| 394 | R_BX = 0; |
| 395 | else |
| 396 | R_BX = ems_handle[handle]->npages; |
| 397 | R_AH = EMS_SUCCESS; |
| 398 | break; |
| 399 | } |
| 400 | |
| 401 | case GET_PAGES_FOR_ALL: |
| 402 | { |
| 403 | EMShandlepage *ehp; |
| 404 | unsigned safecount; |
| 405 | int i; |
| 406 | |
| 407 | debug(D_EMS, "EMS: Get pages for all\n"); |
| 408 | /* Get the address passed from DOS app */ |
| 409 | ehp = (EMShandlepage *)get_valid_pointer(R_ES, R_DI, |
| 410 | sizeof(EMShandlepage) * ems_alloc_handles); |
| 411 | if (ehp == NULL) { |
| 412 | R_AH = EMS_SW_MALFUNC; |
| 413 | break; |
| 414 | } |
| 415 | |
| 416 | R_BX = ems_alloc_handles; |
| 417 | safecount = 0; |
| 418 | for (i = 0; i < 255; i++) { |
| 419 | if (ems_handle[i] != NULL) { |
| 420 | if (safecount > (ems_alloc_handles+1)) |
| 421 | fatal("EMS: ems_alloc_handles is wrong, " |
| 422 | "cannot continue\n"); |
| 423 | ehp->handle = i; |
| 424 | ehp->npages = ems_handle[i]->npages; |
| 425 | ehp++; |
| 426 | safecount++; |
| 427 | } |
| 428 | } |
| 429 | R_AH = EMS_SUCCESS; |
| 430 | break; |
| 431 | } |
| 432 | |
| 433 | case PAGE_MAP: |
| 434 | /* This function is a nuisance. It was invented to save time and |
| 435 | * memory, but in our case it is useless. We have to support it |
| 436 | * but we use the same save memory as for the page map function. |
| 437 | * It uses only 20 bytes anyway. We store/restore the entire mapping |
| 438 | */ |
| 439 | case PAGE_MAP_PARTIAL: |
| 440 | { |
| 441 | int subfunction; |
| 442 | EMScontext *src, *dest; |
| 443 | |
| 444 | debug(D_EMS, "EMS: Page map "); |
| 445 | subfunction = R_AL; |
| 446 | if (R_AH == PAGE_MAP_PARTIAL) { |
| 447 | debug(D_EMS, "partial "); |
| 448 | /* Page map partial has slightly different subfunctions |
| 449 | * GET_SET does not exist and is GET_SIZE in this case |
| 450 | */ |
| 451 | if (subfunction == GET_SET) |
| 452 | subfunction = GET_SIZE; |
| 453 | } |
| 454 | switch (subfunction) |
| 455 | { |
| 456 | case GET: |
| 457 | { |
| 458 | debug(D_EMS, "get\n"); |
| 459 | /* Get the address passed from DOS app */ |
| 460 | dest = (EMScontext *)get_valid_pointer(R_ES, R_DI, |
| 461 | sizeof(EMScontext)); |
| 462 | if (dest == NULL) { |
| 463 | R_AH = EMS_SW_MALFUNC; |
| 464 | break; |
| 465 | } |
| 466 | save_context_to_dos(dest); |
| 467 | R_AH = EMS_SUCCESS; |
| 468 | break; |
| 469 | } |
| 470 | case SET: |
| 471 | { |
| 472 | debug(D_EMS, "set\n"); |
| 473 | src = (EMScontext *)get_valid_pointer(R_DS, R_SI, |
| 474 | sizeof(EMScontext)); |
| 475 | if (src == NULL) { |
| 476 | R_AH = EMS_SW_MALFUNC; |
| 477 | break; |
| 478 | } |
| 479 | if (check_saved_context(src) == 0) { |
| 480 | R_AH = EMS_SAVED_CONTEXT_BAD; |
| 481 | break; |
| 482 | } |
| 483 | restore_context(&src->ems_saved_context); |
| 484 | R_AH = EMS_SUCCESS; |
| 485 | break; |
| 486 | } |
| 487 | case GET_SET: |
| 488 | { |
| 489 | debug(D_EMS, "get/set\n"); |
| 490 | dest = (EMScontext *)get_valid_pointer(R_ES, R_DI, |
| 491 | sizeof(EMScontext)); |
| 492 | if (dest == NULL) { |
| 493 | R_AH = EMS_SW_MALFUNC; |
| 494 | break; |
| 495 | } |
| 496 | save_context_to_dos(dest); |
| 497 | src = (EMScontext *)get_valid_pointer(R_DS, R_SI, |
| 498 | sizeof(EMScontext)); |
| 499 | if (src == NULL) { |
| 500 | R_AH = EMS_SW_MALFUNC; |
| 501 | break; |
| 502 | } |
| 503 | if (check_saved_context(src) == 0) { |
| 504 | R_AH = EMS_SAVED_CONTEXT_BAD; |
| 505 | break; |
| 506 | } |
| 507 | restore_context(&src->ems_saved_context); |
| 508 | R_AH = EMS_SUCCESS; |
| 509 | break; |
| 510 | } |
| 511 | case GET_SIZE: |
| 512 | debug(D_EMS, "get size\n"); |
| 513 | R_AL = (sizeof(EMScontext) + 1) & 0xfe; |
| 514 | R_AH = EMS_SUCCESS; |
| 515 | break; |
| 516 | default: |
| 517 | debug(D_EMS, "invalid subfunction\n"); |
| 518 | R_AH = EMS_INVALID_SUB; |
| 519 | break; |
| 520 | } |
| 521 | break; |
| 522 | } |
| 523 | |
| 524 | case MAP_UNMAP_MULTI_HANDLE: |
| 525 | { |
| 526 | u_char position; |
| 527 | u_short hpagenum, spagenum; |
| 528 | short handle; |
| 529 | EMSmapunmap *mp; |
| 530 | int n_entry, i; |
| 531 | |
| 532 | |
| 533 | debug(D_EMS, "EMS: Map/Unmap multiple "); |
| 534 | |
| 535 | if ((n_entry = R_CX) > 3) { |
| 536 | R_AH = EMS_ILL_PHYS; |
| 537 | } |
| 538 | |
| 539 | /* This is valid according to the LIM EMS 4.0 spec */ |
| 540 | if (n_entry == 0) { |
| 541 | R_AH = EMS_SUCCESS; |
| 542 | break; |
| 543 | } |
| 544 | |
| 545 | handle = R_DX; |
| 546 | if (handle > 255 || handle == 0 || ems_handle[handle] == NULL) { |
| 547 | R_AH = EMS_INV_HANDLE; |
| 548 | break; |
| 549 | } |
| 550 | |
| 551 | mp = (EMSmapunmap *)get_valid_pointer(R_DS, R_SI, |
| 552 | sizeof(EMSmapunmap) * n_entry); |
| 553 | if (mp == NULL) { |
| 554 | R_AH = EMS_SW_MALFUNC; |
| 555 | break; |
| 556 | } |
| 557 | |
| 558 | R_AH = EMS_SUCCESS; |
| 559 | /* Walk through the table and map/unmap */ |
| 560 | for (i = 0; i < n_entry; i++) { |
| 561 | hpagenum = mp->log; |
| 562 | /* Method is in R_AL */ |
| 563 | if (R_AL == 0) { |
| 564 | debug(D_EMS, "phys page method\n"); |
| 565 | if (mp->phys <= 3) { |
| 566 | position = mp->phys; |
| 567 | } else { |
| 568 | R_AH = EMS_ILL_PHYS; |
| 569 | break; |
| 570 | } |
| 571 | } else if (R_AL == 1) { |
| 572 | /* Compute position from segment address */ |
| 573 | u_short p_seg; |
| 574 | |
| 575 | debug(D_EMS, "segment method\n"); |
| 576 | p_seg = mp->phys; |
| 577 | p_seg -= ems_frame_addr; |
| 578 | p_seg /= EMS_PAGESIZE; |
| 579 | if (p_seg <= 3) { |
| 580 | position = p_seg; |
| 581 | } else { |
| 582 | R_AH = EMS_ILL_PHYS; |
| 583 | break; |
| 584 | } |
| 585 | } else { |
| 586 | debug(D_EMS, "invalid subfunction\n"); |
| 587 | R_AH = EMS_INVALID_SUB; |
| 588 | break; |
| 589 | } |
| 590 | |
| 591 | mp++; |
| 592 | if (hpagenum == 0xffff) { |
| 593 | /* Unmap only */ |
| 594 | map_page(0, position, handle, 1); |
| 595 | continue; |
| 596 | } |
| 597 | if (hpagenum >= ems_handle[handle]->npages) { |
| 598 | R_AH = EMS_LOGPAGE_TOOBIG; |
| 599 | break; |
| 600 | } |
| 601 | spagenum = ems_handle[handle]->pagenum[hpagenum]; |
| 602 | map_page(spagenum, position, handle, 0); |
| 603 | } |
| 604 | break; |
| 605 | } |
| 606 | |
| 607 | case REALLOC_PAGES: |
| 608 | { |
| 609 | short handle; |
| 610 | u_long newpages; |
| 611 | |
| 612 | debug(D_EMS, "EMS: Realloc pages "); |
| 613 | |
| 614 | handle = R_DX; |
| 615 | if (handle > 255 || handle == 0 || ems_handle[handle] == NULL) { |
| 616 | R_AH = EMS_INV_HANDLE; |
| 617 | debug(D_EMS, "invalid handle\n"); |
| 618 | break; |
| 619 | } |
| 620 | newpages = R_BX; |
| 621 | debug(D_EMS, "changed from %ld to %ld pages\n", |
| 622 | ems_handle[handle]->npages, newpages); |
| 623 | |
| 624 | /* Case 1: Realloc to zero pages */ |
| 625 | if (newpages == 0) { |
| 626 | free_pages_of_handle(handle); |
| 627 | R_AH = EMS_SUCCESS; |
| 628 | break; |
| 629 | } |
| 630 | /* Case 2: New allocation is equal to allocated number */ |
| 631 | if (newpages == ems_handle[handle]->npages) { |
| 632 | R_AH = EMS_SUCCESS; |
| 633 | break; |
| 634 | } |
| 635 | /* Case 3: Reallocate to bigger and smaller sizes */ |
| 636 | if (newpages > ems_handle[handle]->npages) { |
| 637 | if (newpages > ems_free_pages) { |
| 638 | R_AH = EMS_OUT_OF_LOG; |
| 639 | break; |
| 640 | } |
| 641 | if (newpages > ems_total_pages) { |
| 642 | R_AH = EMS_OUT_OF_PHYS; |
| 643 | break; |
| 644 | } |
| 645 | } |
| 646 | reallocate_pages_to_handle(handle, newpages); |
| 647 | R_AH = EMS_SUCCESS; |
| 648 | break; |
| 649 | } |
| 650 | |
| 651 | /* We do not support nonvolatile pages */ |
| 652 | case HANDLE_ATTRIBUTES: |
| 653 | debug(D_EMS, "Handle attributes called\n"); |
| 654 | switch (R_AL) { |
| 655 | case GET: |
| 656 | case SET: |
| 657 | R_AH = EMS_FEAT_NOSUP; |
| 658 | break; |
| 659 | case HANDLE_CAPABILITY: |
| 660 | R_AL = 0; /* Volatile only */ |
| 661 | R_AH = EMS_SUCCESS; |
| 662 | break; |
| 663 | default: |
| 664 | R_AH = EMS_FUNC_NOSUP; |
| 665 | break; |
| 666 | } |
| 667 | break; |
| 668 | |
| 669 | case HANDLE_NAME: |
| 670 | { |
| 671 | short handle; |
| 672 | Hname *hp; |
| 673 | |
| 674 | handle = R_DX; |
| 675 | if (handle > 255 || handle == 0 || ems_handle[handle] == NULL) { |
| 676 | R_AH = EMS_INV_HANDLE; |
| 677 | debug(D_EMS, "invalid handle\n"); |
| 678 | break; |
| 679 | } |
| 680 | switch (R_AL) { |
| 681 | case GET: |
| 682 | if ((hp = (Hname *)get_valid_pointer(R_ES, R_DI, 8)) |
| 683 | == NULL) { |
| 684 | R_AH = EMS_SW_MALFUNC; |
| 685 | break; |
| 686 | } |
| 687 | *hp = ems_handle[handle]->hname; |
| 688 | R_AH = EMS_SUCCESS; |
| 689 | break; |
| 690 | |
| 691 | case SET: |
| 692 | if ((hp = (Hname *)get_valid_pointer(R_DS, R_SI, 8)) |
| 693 | == NULL) { |
| 694 | R_AH = EMS_SW_MALFUNC; |
| 695 | break; |
| 696 | } |
| 697 | /* If the handle name is not 0, it may not exist */ |
| 698 | if ((hp->ul_hn[0] | hp->ul_hn[1]) != 0) { |
| 699 | if (lookup_handle(hp) == 0) { |
| 700 | ems_handle[handle]->hname = *hp; |
| 701 | R_AH = EMS_SUCCESS; |
| 702 | } else { |
| 703 | R_AH = EMS_NAME_EXISTS; |
| 704 | break; |
| 705 | } |
| 706 | } else { |
| 707 | /* Name is deleted (set to zeros) */ |
| 708 | ems_handle[handle]->hname = *hp; |
| 709 | R_AH = EMS_SUCCESS; |
| 710 | } |
| 711 | break; |
| 712 | |
| 713 | default: |
| 714 | R_AH = EMS_FUNC_NOSUP; |
| 715 | break; |
| 716 | } |
| 717 | break; |
| 718 | } |
| 719 | |
| 720 | case HANDLE_DIRECTORY: |
| 721 | { |
| 722 | int i; |
| 723 | EMShandledir *hdp; |
| 724 | Hname *hp; |
| 725 | short handle; |
| 726 | |
| 727 | switch(R_AL) { |
| 728 | case GET: |
| 729 | hdp = (EMShandledir *)get_valid_pointer(R_ES, R_DI, |
| 730 | sizeof(EMShandledir) * ems_alloc_handles); |
| 731 | if (hdp == NULL) { |
| 732 | R_AH = EMS_SW_MALFUNC; |
| 733 | break; |
| 734 | } |
| 735 | for (i = 0; i < EMS_NUM_HANDLES; i++) { |
| 736 | if (ems_handle[i] != NULL) { |
| 737 | hdp->log = i; |
| 738 | hdp->name = ems_handle[i]->hname; |
| 739 | } |
| 740 | } |
| 741 | R_AH = EMS_SUCCESS; |
| 742 | break; |
| 743 | |
| 744 | case HANDLE_SEARCH: |
| 745 | hp = (Hname *)get_valid_pointer(R_DS, R_SI, 8); |
| 746 | if (hp == NULL) { |
| 747 | R_AH = EMS_SW_MALFUNC; |
| 748 | break; |
| 749 | } |
| 750 | /* Cannot search for NULL handle name */ |
| 751 | if ((hp->ul_hn[0] | hp->ul_hn[1]) != 0) { |
| 752 | R_AH = EMS_NAME_EXISTS; |
| 753 | break; |
| 754 | } |
| 755 | if ((handle = lookup_handle(hp)) == 0) { |
| 756 | R_AH = EMS_HNAME_NOT_FOUND; |
| 757 | } else { |
| 758 | R_DX = handle; |
| 759 | R_AH = EMS_SUCCESS; |
| 760 | } |
| 761 | break; |
| 762 | |
| 763 | case GET_TOTAL_HANDLES: |
| 764 | R_AH = EMS_SUCCESS; |
| 765 | R_BX = EMS_NUM_HANDLES; /* Includes OS handle */ |
| 766 | break; |
| 767 | |
| 768 | default: |
| 769 | R_AH = EMS_FUNC_NOSUP; |
| 770 | break; |
| 771 | } |
| 772 | break; |
| 773 | } |
| 774 | |
| 775 | |
| 776 | /* I do not know if we need this. LINUX emulation leaves it out |
| 777 | * so I leave it out too for now. |
| 778 | */ |
| 779 | case ALTER_PAGEMAP_JUMP: |
| 780 | debug(D_ALWAYS, "Alter pagemap and jump used!\n"); |
| 781 | R_AH = EMS_FUNC_NOSUP; |
| 782 | break; |
| 783 | case ALTER_PAGEMAP_CALL: |
| 784 | debug(D_ALWAYS, "Alter pagemap and call used!\n"); |
| 785 | R_AH = EMS_FUNC_NOSUP; |
| 786 | break; |
| 787 | |
| 788 | |
| 789 | case MOVE_MEMORY_REGION: |
| 790 | { |
| 791 | EMSmovemem *emvp; |
| 792 | u_long src_addr = 0, dst_addr = 0; |
| 793 | u_short src_handle = 0, dst_handle = 0; |
| 794 | |
| 795 | if (R_AL == EXCHANGE) |
| 796 | debug(D_EMS, "EMS: Exchange memory region "); |
| 797 | else |
| 798 | debug(D_EMS, "EMS: Move memory region "); |
| 799 | |
| 800 | emvp = (EMSmovemem *)get_valid_pointer(R_DS, R_SI, |
| 801 | sizeof(EMSmovemem)); |
| 802 | if (emvp == NULL) { |
| 803 | debug(D_EMS, "Invalid structure pointer\n"); |
| 804 | R_AH = EMS_SW_MALFUNC; |
| 805 | break; |
| 806 | } |
| 807 | /* Zero length is not an error */ |
| 808 | if (emvp->length == 0) { |
| 809 | debug(D_EMS, "Zero length\n"); |
| 810 | R_AH = EMS_SUCCESS; |
| 811 | break; |
| 812 | } |
| 813 | /* Some checks */ |
| 814 | if (emvp->src_type == EMS_MOVE_CONV) { |
| 815 | /* Conventional memory source */ |
| 816 | src_addr = MAKEPTR(emvp->src_seg, emvp->src_offset); |
| 817 | /* May not exceed conventional memory */ |
| 818 | if ((src_addr + emvp->length) > 640 * 1024) { |
| 819 | R_AH = EMS_SW_MALFUNC; |
| 820 | break; |
| 821 | } |
| 822 | } else { |
| 823 | /* Check the handle */ |
| 824 | src_handle = emvp->src_handle; |
| 825 | if (src_handle > 255 || src_handle == 0 || |
| 826 | ems_handle[src_handle] == NULL) { |
| 827 | R_AH = EMS_INV_HANDLE; |
| 828 | debug(D_EMS, "invalid source handle\n"); |
| 829 | break; |
| 830 | } |
| 831 | /* Offset may not exceed page size */ |
| 832 | if (emvp->src_offset >= (16 * 1024)) { |
| 833 | R_AH = EMS_PAGEOFFSET; |
| 834 | debug(D_EMS, "source page offset too big\n"); |
| 835 | break; |
| 836 | } |
| 837 | } |
| 838 | |
| 839 | if (emvp->dst_type == EMS_MOVE_CONV) { |
| 840 | /* Conventional memory source */ |
| 841 | dst_addr = MAKEPTR(emvp->dst_seg, emvp->dst_offset); |
| 842 | /* May not exceed conventional memory */ |
| 843 | if ((dst_addr + emvp->length) > 640 * 1024) { |
| 844 | R_AH = EMS_SW_MALFUNC; |
| 845 | break; |
| 846 | } |
| 847 | } else { |
| 848 | /* Check the handle */ |
| 849 | dst_handle = emvp->dst_handle; |
| 850 | if (dst_handle > 255 || dst_handle == 0 || |
| 851 | ems_handle[dst_handle] == NULL) { |
| 852 | R_AH = EMS_INV_HANDLE; |
| 853 | debug(D_EMS, "invalid destination handle\n"); |
| 854 | break; |
| 855 | } |
| 856 | /* Offset may not exceed page size */ |
| 857 | if (emvp->dst_offset >= (16 * 1024)) { |
| 858 | R_AH = EMS_PAGEOFFSET; |
| 859 | debug(D_EMS, "destination page offset too big\n"); |
| 860 | break; |
| 861 | } |
| 862 | } |
| 863 | |
| 864 | if (R_AL == MOVE) { |
| 865 | /* If it is conventional memory only, do it */ |
| 866 | if (emvp->src_type == EMS_MOVE_CONV && |
| 867 | emvp->dst_type == EMS_MOVE_CONV) { |
| 868 | memmove((void *)dst_addr, (void *)src_addr, |
| 869 | (size_t) emvp->length); |
| 870 | debug(D_EMS, "conventional to conventional memory done\n"); |
| 871 | R_AH = EMS_SUCCESS; |
| 872 | break; |
| 873 | } |
| 874 | if (emvp->src_type == EMS_MOVE_EMS && |
| 875 | emvp->dst_type == EMS_MOVE_CONV) |
| 876 | R_AH = move_ems_to_conv(src_handle, emvp->src_seg, |
| 877 | emvp->src_offset, dst_addr, emvp->length); |
| 878 | else if (emvp->src_type == EMS_MOVE_CONV && |
| 879 | emvp->dst_type == EMS_MOVE_EMS) |
| 880 | R_AH = move_conv_to_ems(src_addr, dst_handle, |
| 881 | emvp->dst_seg, emvp->dst_offset, emvp->length); |
| 882 | else |
| 883 | R_AH = move_ems_to_ems(src_handle, emvp->src_seg, |
| 884 | emvp->src_offset, dst_handle, emvp->dst_seg, |
| 885 | emvp->dst_offset, emvp->length); |
| 886 | debug(D_EMS, " done\n"); |
| 887 | break; |
| 888 | } else { |
| 889 | /* exchange memory region */ |
| 890 | |
| 891 | /* We need a scratch area for the exchange */ |
| 892 | void *buffer; |
| 893 | if ((buffer = malloc(emvp->length)) == NULL) |
| 894 | fatal("EMS: Could not malloc scratch area for exchange"); |
| 895 | |
| 896 | /* If it is conventional memory only, do it */ |
| 897 | if (emvp->src_type == EMS_MOVE_CONV && |
| 898 | emvp->dst_type == EMS_MOVE_CONV) { |
| 899 | /* destination -> buffer */ |
| 900 | memmove(buffer, (void *)dst_addr, (size_t) emvp->length); |
| 901 | /* Source -> destination */ |
| 902 | memmove((void *)dst_addr, (void *)src_addr, |
| 903 | (size_t) emvp->length); |
| 904 | /* Buffer -> source */ |
| 905 | memmove((void *)src_addr, buffer, (size_t) emvp->length); |
| 906 | free(buffer); |
| 907 | debug(D_EMS, "conventional to conventional memory done\n"); |
| 908 | R_AH = EMS_SUCCESS; |
| 909 | break; |
| 910 | } |
| 911 | |
| 912 | /* Exchange EMS with conventional */ |
| 913 | if (emvp->src_type == EMS_MOVE_EMS && |
| 914 | emvp->dst_type == EMS_MOVE_CONV) { |
| 915 | /* Destination -> buffer */ |
| 916 | memmove(buffer, (void *)dst_addr, (size_t) emvp->length); |
| 917 | /* Source -> destination */ |
| 918 | R_AH = move_ems_to_conv(src_handle, emvp->src_seg, |
| 919 | emvp->src_offset, dst_addr, emvp->length); |
| 920 | if (R_AH != EMS_SUCCESS) { |
| 921 | free(buffer); |
| 922 | break; |
| 923 | } |
| 924 | /* Buffer -> source */ |
| 925 | R_AH = move_conv_to_ems((u_long)buffer, src_handle, |
| 926 | emvp->src_seg, emvp->src_offset, emvp->length); |
| 927 | |
| 928 | /* Exchange conventional with EMS */ |
| 929 | } else if (emvp->src_type == EMS_MOVE_CONV && |
| 930 | emvp->dst_type == EMS_MOVE_EMS) { |
| 931 | /* Destination -> buffer */ |
| 932 | R_AH = move_ems_to_conv(dst_handle, emvp->dst_seg, |
| 933 | emvp->dst_offset, (u_long)buffer, emvp->length); |
| 934 | if (R_AH != EMS_SUCCESS) { |
| 935 | free(buffer); |
| 936 | break; |
| 937 | } |
| 938 | /* Source -> destination */ |
| 939 | R_AH = move_conv_to_ems((u_long)buffer, dst_handle, |
| 940 | emvp->dst_seg, emvp->dst_offset, emvp->length); |
| 941 | /* Buffer -> source */ |
| 942 | memmove(buffer, (void *)src_addr, (size_t) emvp->length); |
| 943 | |
| 944 | /* Exchange EMS with EMS */ |
| 945 | } else { |
| 946 | /* Destination -> buffer */ |
| 947 | R_AH = move_ems_to_conv(dst_handle, emvp->dst_seg, |
| 948 | emvp->dst_offset, (u_long)buffer, emvp->length); |
| 949 | if (R_AH != EMS_SUCCESS) { |
| 950 | free(buffer); |
| 951 | break; |
| 952 | } |
| 953 | /* Source -> destination */ |
| 954 | R_AH = move_ems_to_ems(src_handle, emvp->src_seg, |
| 955 | emvp->src_offset, dst_handle, emvp->dst_seg, |
| 956 | emvp->dst_offset, emvp->length); |
| 957 | if (R_AH != EMS_SUCCESS) { |
| 958 | free(buffer); |
| 959 | break; |
| 960 | } |
| 961 | /* Buffer -> source */ |
| 962 | R_AH = move_conv_to_ems((u_long)buffer, src_handle, |
| 963 | emvp->src_seg, emvp->src_offset, emvp->length); |
| 964 | } |
| 965 | free(buffer); |
| 966 | } |
| 967 | debug(D_EMS, " done\n"); |
| 968 | break; |
| 969 | } |
| 970 | |
| 971 | case GET_MAPPABLE_PHYS_ADDR: |
| 972 | { |
| 973 | switch (R_AL) { |
| 974 | case GET_ARRAY: |
| 975 | { |
| 976 | EMSaddrarray *eadp; |
| 977 | int i; |
| 978 | u_short seg; |
| 979 | |
| 980 | eadp = (EMSaddrarray *)get_valid_pointer(R_ES, R_DI, |
| 981 | sizeof(EMSaddrarray) * 4); |
| 982 | if (eadp == NULL) { |
| 983 | R_AH = EMS_SW_MALFUNC; |
| 984 | break; |
| 985 | } |
| 986 | for (i = 0, seg = (ems_frame_addr >> 4); i < 4; i++) { |
| 987 | eadp->segm = seg; |
| 988 | eadp->phys = i; |
| 989 | eadp++; |
| 990 | seg += 1024; |
| 991 | } |
| 992 | R_AH = EMS_SUCCESS; |
| 993 | break; |
| 994 | } |
| 995 | case GET_ARRAY_ENTRIES: |
| 996 | /* There are always 4 positions, 4*16kB = 64kB */ |
| 997 | R_CX = 4; |
| 998 | R_AH = EMS_SUCCESS; |
| 999 | break; |
| 1000 | default: |
| 1001 | R_AH = EMS_FUNC_NOSUP; |
| 1002 | break; |
| 1003 | } |
| 1004 | break; |
| 1005 | } |
| 1006 | |
| 1007 | /* This is an OS function in the LIM EMS 4.0 standard: It is |
| 1008 | * usable only by an OS and its use can be disabled for all other |
| 1009 | * programs. I think we do not need to support it. It is not |
| 1010 | * implemented and it reports "disabled" to any caller. |
| 1011 | */ |
| 1012 | case GET_HW_CONFIGURATION: |
| 1013 | R_AH = EMS_FUNCTION_DISABLED; |
| 1014 | break; |
| 1015 | |
| 1016 | /* This function is a little different, it was defined with |
| 1017 | * LIM EMS 4.0: It is allowed to allocate zero pages and raw |
| 1018 | * page size (i.e. page size != 16kB) is supported. We have |
| 1019 | * only 16kB pages, so the second difference does not matter. |
| 1020 | */ |
| 1021 | case ALLOCATE_PAGES: |
| 1022 | { |
| 1023 | u_short npages; |
| 1024 | short handle; |
| 1025 | |
| 1026 | npages = R_BX; |
| 1027 | debug(D_EMS, "EMS: Get handle and allocate %d pages: ", npages); |
| 1028 | |
| 1029 | /* Enough handles? */ |
| 1030 | if ((handle = find_next_free_handle()) < 0) { |
| 1031 | debug(D_EMS,"Return error:No handles\n"); |
| 1032 | R_AH = EMS_OUT_OF_HANDLES; |
| 1033 | break; |
| 1034 | } |
| 1035 | /* Enough memory for this request ? */ |
| 1036 | if (npages > ems_free_pages) { |
| 1037 | debug(D_EMS,"Return error:Request too big\n"); |
| 1038 | R_AH = EMS_OUT_OF_LOG; |
| 1039 | break; |
| 1040 | } |
| 1041 | if (npages > ems_total_pages) { |
| 1042 | debug(D_EMS,"Return error:Request too big\n"); |
| 1043 | R_AH = EMS_OUT_OF_PHYS; |
| 1044 | break; |
| 1045 | } |
| 1046 | |
| 1047 | /* Allocate the handle */ |
| 1048 | allocate_handle(handle, npages); |
| 1049 | |
| 1050 | /* Allocate the pages */ |
| 1051 | allocate_pages_to_handle(handle, npages); |
| 1052 | R_DX = handle; |
| 1053 | R_AH = EMS_SUCCESS; |
| 1054 | debug(D_EMS,"Return success:Handle = %d\n", handle); |
| 1055 | break; |
| 1056 | } |
| 1057 | |
| 1058 | /* This is an OS function in the LIM EMS 4.0 standard: It is |
| 1059 | * usable only by an OS and its use can be disabled for all other |
| 1060 | * programs. I think we do not need to support it. It is not |
| 1061 | * implemented and it reports "disabled" to any caller. |
| 1062 | */ |
| 1063 | case ALTERNATE_MAP_REGISTER: |
| 1064 | R_AH = EMS_FUNCTION_DISABLED; |
| 1065 | break; |
| 1066 | |
| 1067 | /* We cannot support that ! */ |
| 1068 | case PREPARE_WARMBOOT: |
| 1069 | R_AH = EMS_FUNC_NOSUP; |
| 1070 | break; |
| 1071 | |
| 1072 | case OS_FUNCTION_SET: |
| 1073 | R_AH = EMS_FUNCTION_DISABLED; |
| 1074 | break; |
| 1075 | |
| 1076 | default: |
| 1077 | debug(D_ALWAYS, "EMS: Unknown function called: %02x\n", R_AH); |
| 1078 | R_AH = EMS_FUNC_NOSUP; |
| 1079 | break; |
| 1080 | } |
| 1081 | } |
| 1082 | |
| 1083 | /* Initialize the EMS memory: Return 1 on success, 0 on failure */ |
| 1084 | |
| 1085 | static int |
| 1086 | init_mapfile(void) |
| 1087 | { |
| 1088 | char path[256]; |
| 1089 | int mfd; |
| 1090 | |
| 1091 | /* Sanity */ |
| 1092 | if (ems_max_size == 0) |
| 1093 | return 0; |
| 1094 | strcpy(path, EMS_MAP_PATH); |
| 1095 | strcat(path, EMS_MAP_FILE); |
| 1096 | |
| 1097 | mfd = mkstemp(path); |
| 1098 | |
| 1099 | if (mfd < 0) { |
| 1100 | debug(D_ALWAYS, "Could not create EMS mapfile, "); |
| 1101 | goto fail; |
| 1102 | } |
| 1103 | unlink(path); |
| 1104 | mapfile_fd = squirrel_fd(mfd); |
| 1105 | |
| 1106 | if (lseek(mapfile_fd, (off_t)(ems_max_size - 1), 0) < 0) { |
| 1107 | debug(D_ALWAYS, "Could not seek into EMS mapfile, "); |
| 1108 | goto fail; |
| 1109 | } |
| 1110 | if (write(mapfile_fd, "", 1) < 0) { |
| 1111 | debug(D_ALWAYS, "Could not write to EMS mapfile, "); |
| 1112 | goto fail; |
| 1113 | } |
| 1114 | /* Unmap the entire page frame */ |
| 1115 | if (munmap((caddr_t)ems_frame_addr, 64 * 1024) < 0) { |
| 1116 | debug(D_ALWAYS, "Could not unmap EMS page frame, "); |
| 1117 | goto fail; |
| 1118 | } |
| 1119 | /* DOS programs will access the page frame without allocating |
| 1120 | * pages first. Microsoft diagnose MSD.EXE does this, for example |
| 1121 | * We need to have memory here to avoid segmentation violation |
| 1122 | */ |
| 1123 | if (mmap((caddr_t)ems_frame_addr, 64 * 1024, |
| 1124 | PROT_EXEC | PROT_READ | PROT_WRITE, |
| 1125 | MAP_ANON | MAP_FIXED | MAP_SHARED, |
| 1126 | -1, 0) == MAP_FAILED) { |
| 1127 | debug(D_ALWAYS, "Could not map EMS page frame, "); |
| 1128 | goto fail; |
| 1129 | } |
| 1130 | bzero((void *)&ems_mapping_context, sizeof(EMS_mapping_context)); |
| 1131 | return (1); |
| 1132 | |
| 1133 | fail: |
| 1134 | debug(D_ALWAYS, "EMS disabled\n"); |
| 1135 | ems_max_size = 0; |
| 1136 | ems_frame_addr = 0; |
| 1137 | return (0); |
| 1138 | } |
| 1139 | |
| 1140 | /* Map/Unmap pages into one of four positions in the frame segment */ |
| 1141 | |
| 1142 | static void |
| 1143 | map_page(u_long pagenum, u_char position, short handle, int unmaponly) |
| 1144 | { |
| 1145 | caddr_t map_addr; |
| 1146 | size_t len; |
| 1147 | off_t file_offs; |
| 1148 | |
| 1149 | if (position > 3) |
| 1150 | fatal("EMS: Internal error: Mapping position\n"); |
| 1151 | |
| 1152 | map_addr = (caddr_t)(ems_frame_addr + (1024 * 16 * (u_long)position)); |
| 1153 | len = 1024 * 16; |
| 1154 | file_offs = (off_t)(pagenum * 16 * 1024); |
| 1155 | |
| 1156 | if (ems_mapping_context.pos_mapped[position]) { |
| 1157 | if (munmap(map_addr, len) < 0) { |
| 1158 | fatal("EMS unmapping error: %s\nCannot recover\n", |
| 1159 | strerror(errno)); |
| 1160 | } |
| 1161 | ems_page[ems_mapping_context.pos_pagenum[position]].status |
| 1162 | &= ~EMS_MAPPED; |
| 1163 | ems_mapping_context.pos_mapped[position] = 0; |
| 1164 | ems_mapping_context.handle[position] = 0; |
| 1165 | } |
| 1166 | if (unmaponly) { |
| 1167 | /* DOS programs will access the page frame without allocating |
| 1168 | * pages first. Microsoft diagnose MSD.EXE does this, for example |
| 1169 | * We need to have memory here to avoid segmentation violation |
| 1170 | */ |
| 1171 | if (mmap((caddr_t)ems_frame_addr, 64 * 1024, |
| 1172 | PROT_EXEC | PROT_READ | PROT_WRITE, |
| 1173 | MAP_ANON | MAP_FIXED | MAP_SHARED, |
| 1174 | -1, 0) == MAP_FAILED) |
| 1175 | fatal("Could not map EMS page frame during unmap only\n"); |
| 1176 | return; |
| 1177 | } |
| 1178 | if (mmap(map_addr, len, |
| 1179 | PROT_EXEC | PROT_READ | PROT_WRITE, |
| 1180 | MAP_FILE | MAP_FIXED | MAP_SHARED, |
| 1181 | mapfile_fd, file_offs) == MAP_FAILED) { |
| 1182 | fatal("EMS mapping error: %s\nCannot recover\n", strerror(errno)); |
| 1183 | } |
| 1184 | ems_mapping_context.pos_mapped[position] = 1; |
| 1185 | ems_mapping_context.pos_pagenum[position] = pagenum; |
| 1186 | ems_mapping_context.handle[position] = handle; |
| 1187 | ems_page[pagenum].status |= EMS_MAPPED; |
| 1188 | } |
| 1189 | |
| 1190 | /* Get a pointer from VM86 app, check it and return it. This returns NULL |
| 1191 | * if the pointer is not valid. We can check only for very limited |
| 1192 | * criteria: The pointer and the area defined by size may not point to |
| 1193 | * memory over 1MB and it may not may to addresses under 1kB, because there |
| 1194 | * is the VM86 interrupt table. |
| 1195 | */ |
| 1196 | static void * |
| 1197 | get_valid_pointer(u_short seg, u_short offs, u_long size) |
| 1198 | { |
| 1199 | u_long addr; |
| 1200 | addr = MAKEPTR(seg, offs); |
| 1201 | /* Check bounds */ |
| 1202 | if ((addr + size) >= (1024 * 1024) || addr < 1024) |
| 1203 | return NULL; |
| 1204 | else |
| 1205 | return (void *)addr; |
| 1206 | } |
| 1207 | |
| 1208 | /* Malloc a new handle */ |
| 1209 | static EMS_handle * |
| 1210 | get_new_handle(long npages) |
| 1211 | { |
| 1212 | EMS_handle *ehp; |
| 1213 | size_t dynsize = sizeof(EMS_handle) + sizeof(short) * npages; |
| 1214 | |
| 1215 | if ((ehp = calloc(1, dynsize)) == NULL) |
| 1216 | fatal("Cannot malloc EMS handle, cannot continue\n"); |
| 1217 | return ehp; |
| 1218 | } |
| 1219 | |
| 1220 | /* Allocate a mapping context to a handle */ |
| 1221 | static void |
| 1222 | context_to_handle(short handle) |
| 1223 | { |
| 1224 | EMS_mapping_context *emc; |
| 1225 | |
| 1226 | if (ems_handle[handle] == NULL) |
| 1227 | fatal("EMS context_to_handle called with invalid handle\n"); |
| 1228 | if ((emc = calloc(1, sizeof(EMS_mapping_context))) == NULL) |
| 1229 | fatal("EMS Cannot malloc mapping context, cannot continue\n"); |
| 1230 | ems_handle[handle]->mcontext = emc; |
| 1231 | memmove((void *)emc, (void *)&ems_mapping_context, |
| 1232 | sizeof(EMS_mapping_context)); |
| 1233 | } |
| 1234 | |
| 1235 | /* Find the next free handle, returns -1 if there are no more handles */ |
| 1236 | static long |
| 1237 | find_next_free_handle(void) |
| 1238 | { |
| 1239 | int i; |
| 1240 | |
| 1241 | if (ems_alloc_handles >= 255) |
| 1242 | return (-1); |
| 1243 | /* handle 0 is OS handle */ |
| 1244 | for (i = 1; i < EMS_NUM_HANDLES; i++) { |
| 1245 | if (ems_handle[i] == NULL) |
| 1246 | return (i); |
| 1247 | } |
| 1248 | fatal("EMS handle count garbled, should not happen\n"); |
| 1249 | /* quiet 'gcc -Wall' */ |
| 1250 | return (-1); |
| 1251 | } |
| 1252 | |
| 1253 | /* Look for a named handle, returns 0 if not found, else handle */ |
| 1254 | static short |
| 1255 | lookup_handle(Hname *hp) |
| 1256 | { |
| 1257 | int i; |
| 1258 | |
| 1259 | for (i = 1; i < EMS_NUM_HANDLES; i++) { |
| 1260 | if (ems_handle[i] != NULL) { |
| 1261 | if (hp->ul_hn[0] == ems_handle[i]->hname.ul_hn[0] && |
| 1262 | hp->ul_hn[1] == ems_handle[i]->hname.ul_hn[1]) |
| 1263 | return (i); |
| 1264 | } |
| 1265 | } |
| 1266 | return (0); |
| 1267 | } |
| 1268 | |
| 1269 | /* Malloc a new handle struct and put into array at index handle */ |
| 1270 | static void |
| 1271 | allocate_handle(short handle, long npages) |
| 1272 | { |
| 1273 | if (ems_handle[handle] != NULL) |
| 1274 | fatal("EMS allocate_handle, handle was not free\n"); |
| 1275 | ems_handle[handle] = get_new_handle(npages); |
| 1276 | ems_alloc_handles++; |
| 1277 | } |
| 1278 | |
| 1279 | /* Free a handle, return its memory. Call this *after* freeing the |
| 1280 | * allocated pages ! |
| 1281 | */ |
| 1282 | static void |
| 1283 | free_handle(short handle) |
| 1284 | { |
| 1285 | if (ems_handle[handle] == NULL) |
| 1286 | fatal("EMS free_handle, handle was free\n"); |
| 1287 | if (ems_handle[handle]->mcontext != NULL) |
| 1288 | free((void *)ems_handle[handle]->mcontext); |
| 1289 | free((void *)ems_handle[handle]); |
| 1290 | ems_handle[handle] = NULL; |
| 1291 | ems_alloc_handles--; |
| 1292 | } |
| 1293 | |
| 1294 | |
| 1295 | /* Allocates npages to handle. Call this routine only after you have |
| 1296 | * ensured there are enough free pages *and* the new handle is in place |
| 1297 | * in the handle array ! |
| 1298 | */ |
| 1299 | static void |
| 1300 | allocate_pages_to_handle(u_short handle, long npages) |
| 1301 | { |
| 1302 | unsigned syspagenum; |
| 1303 | int pages_to_alloc = npages; |
| 1304 | int allocpagenum = 0; |
| 1305 | |
| 1306 | /* sanity */ |
| 1307 | if (handle > 255 || ems_handle[handle] == NULL) |
| 1308 | fatal("EMS allocate_pages_to_handle called with invalid handle\n"); |
| 1309 | |
| 1310 | ems_handle[handle]->npages = npages; |
| 1311 | for (syspagenum = 0; syspagenum < ems_total_pages; syspagenum++) { |
| 1312 | if (ems_page[syspagenum].status == EMS_FREE) { |
| 1313 | ems_page[syspagenum].handle = handle; |
| 1314 | ems_page[syspagenum].status = EMS_ALLOCED; |
| 1315 | ems_handle[handle]->pagenum[allocpagenum] = syspagenum; |
| 1316 | allocpagenum++; |
| 1317 | pages_to_alloc--; |
| 1318 | if (pages_to_alloc == 0) |
| 1319 | break; |
| 1320 | } |
| 1321 | } |
| 1322 | if (pages_to_alloc > 0) |
| 1323 | fatal("EMS allocate_pages_to_handle found not enough free pages\n"); |
| 1324 | ems_alloc_pages += npages; |
| 1325 | ems_free_pages -= npages; |
| 1326 | } |
| 1327 | |
| 1328 | /* Reallocates npages to handle. Call this routine only after you have |
| 1329 | * ensured there are enough free pages *and* the new handle is in place |
| 1330 | * in the handle array ! |
| 1331 | */ |
| 1332 | static void |
| 1333 | reallocate_pages_to_handle(u_short handle, long npages) |
| 1334 | { |
| 1335 | unsigned allocpagenum; |
| 1336 | unsigned syspagenum; |
| 1337 | int pages_to_alloc; |
| 1338 | long delta; |
| 1339 | size_t dynsize; |
| 1340 | EMS_handle *emp; |
| 1341 | |
| 1342 | /* sanity */ |
| 1343 | if (handle > 255 || ems_handle[handle] == NULL) |
| 1344 | fatal("EMS allocate_pages_to_handle called with invalid handle\n"); |
| 1345 | |
| 1346 | delta = npages - ems_handle[handle]->npages; |
| 1347 | if (delta > 0) { |
| 1348 | /* Grow array size and allocation */ |
| 1349 | |
| 1350 | emp = ems_handle[handle]; |
| 1351 | dynsize = sizeof(EMS_handle) + sizeof(short) * npages; |
| 1352 | |
| 1353 | /* First step: Make room in the handle pagenum array */ |
| 1354 | if ((emp = (EMS_handle *)realloc((void *)emp, dynsize)) == NULL) |
| 1355 | fatal("Cannot malloc EMS handle, cannot continue\n"); |
| 1356 | ems_handle[handle] = emp; |
| 1357 | |
| 1358 | /* Second step: Add pages to the handle */ |
| 1359 | pages_to_alloc = delta; |
| 1360 | allocpagenum = ems_handle[handle]->npages; |
| 1361 | ems_handle[handle]->npages = npages; |
| 1362 | for (syspagenum = 0; syspagenum < ems_total_pages; syspagenum++) { |
| 1363 | if (ems_page[syspagenum].status == EMS_FREE) { |
| 1364 | ems_page[syspagenum].handle = handle; |
| 1365 | ems_page[syspagenum].status = EMS_ALLOCED; |
| 1366 | ems_handle[handle]->pagenum[allocpagenum] = syspagenum; |
| 1367 | allocpagenum++; |
| 1368 | pages_to_alloc--; |
| 1369 | if (pages_to_alloc == 0) |
| 1370 | break; |
| 1371 | } |
| 1372 | } |
| 1373 | if (pages_to_alloc > 0) |
| 1374 | fatal("EMS allocate_pages_to_handle found not enough free pages\n"); |
| 1375 | |
| 1376 | } else { |
| 1377 | /* Shrink array size and allocation */ |
| 1378 | |
| 1379 | /* First step: Deallocate all pages from new size to old size */ |
| 1380 | for (allocpagenum = npages; |
| 1381 | allocpagenum < ems_handle[handle]->npages; |
| 1382 | allocpagenum++) { |
| 1383 | syspagenum = ems_handle[handle]->pagenum[allocpagenum]; |
| 1384 | |
| 1385 | /* sanity */ |
| 1386 | if (syspagenum > ems_total_pages) |
| 1387 | fatal("EMS free_pages_of_handle found invalid page number\n"); |
| 1388 | if (!(ems_page[syspagenum].status & EMS_ALLOCED)) |
| 1389 | fatal("EMS free_pages_of_handle tried to free page already free\n"); |
| 1390 | ems_page[syspagenum].handle = 0; |
| 1391 | ems_page[syspagenum].status = EMS_FREE; |
| 1392 | } |
| 1393 | |
| 1394 | /* Second step: Shrink the dynamic array of the handle */ |
| 1395 | dynsize = sizeof(EMS_handle) + sizeof(short) * npages; |
| 1396 | emp = ems_handle[handle]; |
| 1397 | if ((emp = (EMS_handle *)realloc((void *)emp, dynsize)) == NULL) |
| 1398 | fatal("Cannot realloc EMS handle, cannot continue\n"); |
| 1399 | ems_handle[handle] = emp; |
| 1400 | ems_handle[handle]->npages = npages; |
| 1401 | } |
| 1402 | ems_alloc_pages += delta; |
| 1403 | ems_free_pages -= delta; |
| 1404 | } |
| 1405 | |
| 1406 | /* Free all pages belonging to a handle, handle must be valid */ |
| 1407 | static void |
| 1408 | free_pages_of_handle(short handle) |
| 1409 | { |
| 1410 | int allocpagenum; |
| 1411 | unsigned syspagenum; |
| 1412 | int npages; |
| 1413 | |
| 1414 | /* sanity */ |
| 1415 | |
| 1416 | if (handle > 255 || ems_handle[handle] == NULL) |
| 1417 | fatal("EMS free_pages_of_handle called with invalid handle\n"); |
| 1418 | |
| 1419 | if ((npages = ems_handle[handle]->npages) == 0) |
| 1420 | return; |
| 1421 | |
| 1422 | for (allocpagenum = 0; allocpagenum < npages; allocpagenum++) { |
| 1423 | syspagenum = ems_handle[handle]->pagenum[allocpagenum]; |
| 1424 | /* sanity */ |
| 1425 | if (syspagenum > ems_total_pages) |
| 1426 | fatal("EMS free_pages_of_handle found invalid page number\n"); |
| 1427 | if (!(ems_page[syspagenum].status & EMS_ALLOCED)) |
| 1428 | fatal("EMS free_pages_of_handle tried to free page already free\n"); |
| 1429 | ems_page[syspagenum].handle = 0; |
| 1430 | ems_page[syspagenum].status = EMS_FREE; |
| 1431 | } |
| 1432 | ems_alloc_pages -= npages; |
| 1433 | ems_free_pages += npages; |
| 1434 | } |
| 1435 | |
| 1436 | /* Restore a saved mapping context, overwrites current mapping context */ |
| 1437 | static void |
| 1438 | restore_context(EMS_mapping_context *emc) |
| 1439 | { |
| 1440 | int i; |
| 1441 | |
| 1442 | for (i = 0; i < 4; i++) { |
| 1443 | ems_mapping_context.handle[i] = emc->handle[i]; |
| 1444 | if (emc->pos_mapped[i] != 0 && |
| 1445 | ems_mapping_context.pos_pagenum[i] != emc->pos_pagenum[i]) { |
| 1446 | map_page(emc->pos_pagenum[i], (u_char) i, emc->handle[i], 0); |
| 1447 | } else { |
| 1448 | ems_mapping_context.pos_mapped[i] = 0; |
| 1449 | } |
| 1450 | } |
| 1451 | } |
| 1452 | |
| 1453 | /* Prepare a special context save block for DOS and save it to |
| 1454 | * VM86 memory |
| 1455 | */ |
| 1456 | static void |
| 1457 | save_context_to_dos(EMScontext *emp) |
| 1458 | { |
| 1459 | int i, end; |
| 1460 | EMScontext context; |
| 1461 | u_short *sp; |
| 1462 | u_short sum; |
| 1463 | |
| 1464 | context.ems_saved_context = ems_mapping_context; |
| 1465 | context.magic = EMS_SAVEMAGIC; |
| 1466 | context.checksum = 0; |
| 1467 | sp = (u_short *)&context; |
| 1468 | end = sizeof(EMScontext) / sizeof(short); |
| 1469 | /* Generate checksum */ |
| 1470 | for (i = 0, sum = 0; i < end; i++) { |
| 1471 | sum += *sp++; |
| 1472 | sum &= 0xffff; |
| 1473 | } |
| 1474 | context.checksum = 0x10000L - sum; |
| 1475 | /* Save it to VM86 memory */ |
| 1476 | *emp = context; |
| 1477 | } |
| 1478 | |
| 1479 | /* Check a context returned from VM86 app for validity, return 0, if |
| 1480 | * not valid, else return 1 |
| 1481 | */ |
| 1482 | static int |
| 1483 | check_saved_context(EMScontext *emp) |
| 1484 | { |
| 1485 | int i, end; |
| 1486 | u_short *sp; |
| 1487 | u_short sum; |
| 1488 | |
| 1489 | if (emp->magic != EMS_SAVEMAGIC) |
| 1490 | return 0; |
| 1491 | |
| 1492 | sp = (u_short *)emp; |
| 1493 | end = sizeof(EMScontext) / sizeof(short); |
| 1494 | /* Generate checksum */ |
| 1495 | for (i = 0, sum = 0; i < end; i++) { |
| 1496 | sum += *sp++; |
| 1497 | sum &= 0xffff; |
| 1498 | } |
| 1499 | if (sum != 0) |
| 1500 | return 0; |
| 1501 | else |
| 1502 | return 1; |
| 1503 | } |
| 1504 | |
| 1505 | /* Helper routine for the move routines below: Check if length bytes |
| 1506 | * can be moved from/to handle pages (i.e are there enough pages) |
| 1507 | */ |
| 1508 | static int |
| 1509 | check_alloc_pages(u_short handle, u_short firstpage, u_short offset, |
| 1510 | u_long length __unused) |
| 1511 | { |
| 1512 | u_long nbytes; |
| 1513 | |
| 1514 | if (firstpage > ems_handle[handle]->npages) |
| 1515 | return (0); |
| 1516 | nbytes = (ems_handle[handle]->npages - firstpage) * EMS_PAGESIZE - offset; |
| 1517 | return (ems_handle[handle]->npages >= nbytes); |
| 1518 | } |
| 1519 | |
| 1520 | /* Copy a block of memory up to the next 16kB boundary in the source |
| 1521 | * to the destination in upward direction (i.e. with ascending addresses) |
| 1522 | * XXX Could be an inline function. |
| 1523 | */ |
| 1524 | static void |
| 1525 | copy_block_up(struct copydesc *cdp) |
| 1526 | { |
| 1527 | size_t size; |
| 1528 | void *srcp; |
| 1529 | void *dstp; |
| 1530 | |
| 1531 | /* If source or both memory types are EMS, source determines the |
| 1532 | * block lenght, else destination determines the block lenght |
| 1533 | */ |
| 1534 | if (cdp->copytype & SRC_EMS) |
| 1535 | size = EMS_PAGESIZE - cdp->EMS_OFFS(src_addr); |
| 1536 | else |
| 1537 | size = EMS_PAGESIZE - cdp->EMS_OFFS(dst_addr); |
| 1538 | |
| 1539 | if (size > cdp->rest_len) |
| 1540 | size = cdp->rest_len; |
| 1541 | |
| 1542 | /* If src is EMS memory, it is mapped into position 0 */ |
| 1543 | if (cdp->copytype & SRC_EMS) |
| 1544 | srcp = (void *)(ems_frame_addr + cdp->EMS_OFFS(src_addr)); |
| 1545 | else |
| 1546 | srcp = (void *)(cdp->EMS_PTR(src_addr)); |
| 1547 | |
| 1548 | /* If dest is EMS memory, it is mapped into position 1,2 */ |
| 1549 | if (cdp->copytype & DST_EMS) |
| 1550 | dstp = (void *)(ems_frame_addr + EMS_PAGESIZE + |
| 1551 | cdp->EMS_OFFS(dst_addr)); |
| 1552 | else |
| 1553 | dstp = (void *)(cdp->EMS_PTR(dst_addr)); |
| 1554 | |
| 1555 | /* Move this block */ |
| 1556 | memmove(dstp, srcp, size); |
| 1557 | |
| 1558 | /* Update the copy descriptor: This updates the address of both |
| 1559 | * conventional and EMS memory |
| 1560 | */ |
| 1561 | cdp->EMS_PTR(src_addr) += size; |
| 1562 | cdp->EMS_PTR(dst_addr) += size; |
| 1563 | |
| 1564 | cdp->rest_len -= size; |
| 1565 | } |
| 1566 | |
| 1567 | |
| 1568 | /* Move EMS memory starting with handle page src_seg and offset src_offset |
| 1569 | * to conventional memory dst_addr for length bytes |
| 1570 | * dst_addr is checked, handle is valid |
| 1571 | */ |
| 1572 | static u_long |
| 1573 | move_ems_to_conv(short src_handle, u_short src_seg, |
| 1574 | u_short src_offset, u_long dst_addr, u_long length) |
| 1575 | { |
| 1576 | EMS_mapping_context ems_saved_context; |
| 1577 | EMS_handle *ehp; |
| 1578 | int pageindx = src_seg; |
| 1579 | struct copydesc cd; |
| 1580 | |
| 1581 | if (check_alloc_pages(src_handle, src_seg, src_offset, length) == 0) |
| 1582 | return EMS_MOVE_OVERFLOW; |
| 1583 | |
| 1584 | ehp = ems_handle[src_handle]; |
| 1585 | |
| 1586 | /* Prepare the move: Save the mapping context */ |
| 1587 | ems_saved_context = ems_mapping_context; |
| 1588 | |
| 1589 | /* Setup the copy descriptor struct */ |
| 1590 | |
| 1591 | cd.copytype = SRC_EMS; |
| 1592 | cd.EMS_PAGE(src_addr) = ehp->pagenum[pageindx]; |
| 1593 | cd.EMS_OFFS(src_addr) = src_offset; |
| 1594 | cd.EMS_PTR(dst_addr) = dst_addr; |
| 1595 | cd.rest_len = length; |
| 1596 | |
| 1597 | do { |
| 1598 | /* Map for the first block copy, source is mapped to position zero */ |
| 1599 | map_page(cd.EMS_PAGE(src_addr), 0, src_handle, 0); |
| 1600 | copy_block_up(&cd); |
| 1601 | } while(cd.rest_len > 0); |
| 1602 | |
| 1603 | /* Restore the original mapping */ |
| 1604 | restore_context(&ems_saved_context); |
| 1605 | return EMS_SUCCESS; |
| 1606 | } |
| 1607 | |
| 1608 | /* Move conventional memory starting with src_addr |
| 1609 | * to EMS memory starting with handle page src_seg and offset src_offset |
| 1610 | * for length bytes |
| 1611 | * dst_addr is checked, handle is valid |
| 1612 | */ |
| 1613 | static u_long |
| 1614 | move_conv_to_ems(u_long src_addr, u_short dst_handle, u_short dst_seg, |
| 1615 | u_short dst_offset, u_long length) |
| 1616 | { |
| 1617 | EMS_mapping_context ems_saved_context; |
| 1618 | EMS_handle *ehp; |
| 1619 | int pageindx = dst_seg; |
| 1620 | struct copydesc cd; |
| 1621 | |
| 1622 | if (check_alloc_pages(dst_handle, dst_seg, dst_offset, length) == 0) |
| 1623 | return EMS_MOVE_OVERFLOW; |
| 1624 | |
| 1625 | ehp = ems_handle[dst_handle]; |
| 1626 | |
| 1627 | /* Prepare the move: Save the mapping context */ |
| 1628 | ems_saved_context = ems_mapping_context; |
| 1629 | |
| 1630 | /* Setup the copy descriptor struct */ |
| 1631 | |
| 1632 | cd.copytype = DST_EMS; |
| 1633 | cd.EMS_PAGE(dst_addr) = ehp->pagenum[pageindx]; |
| 1634 | cd.EMS_OFFS(dst_addr) = dst_offset; |
| 1635 | cd.EMS_PTR(src_addr) = src_addr; |
| 1636 | cd.rest_len = length; |
| 1637 | |
| 1638 | do { |
| 1639 | map_page(cd.EMS_PAGE(dst_addr), 1, dst_handle, 0); |
| 1640 | copy_block_up(&cd); |
| 1641 | } while(cd.rest_len > 0); |
| 1642 | |
| 1643 | /* Restore the original mapping */ |
| 1644 | restore_context(&ems_saved_context); |
| 1645 | return EMS_SUCCESS; |
| 1646 | } |
| 1647 | |
| 1648 | static u_long |
| 1649 | move_ems_to_ems(u_short src_handle, u_short src_seg, u_short src_offset, |
| 1650 | u_short dst_handle, u_short dst_seg, u_short dst_offset, |
| 1651 | u_long length) |
| 1652 | { |
| 1653 | EMS_mapping_context ems_saved_context; |
| 1654 | EMS_handle *src_hp, *dst_hp; |
| 1655 | struct copydesc cd; |
| 1656 | |
| 1657 | if (check_alloc_pages(src_handle, src_seg, src_offset, length) == 0) |
| 1658 | return EMS_MOVE_OVERFLOW; |
| 1659 | if (check_alloc_pages(dst_handle, dst_seg, dst_offset, length) == 0) |
| 1660 | return EMS_MOVE_OVERFLOW; |
| 1661 | |
| 1662 | src_hp = ems_handle[src_handle]; |
| 1663 | dst_hp = ems_handle[dst_handle]; |
| 1664 | |
| 1665 | /* Prepare the move: Save the mapping context */ |
| 1666 | ems_saved_context = ems_mapping_context; |
| 1667 | |
| 1668 | /* Setup the copy descriptor struct */ |
| 1669 | |
| 1670 | cd.copytype = SRC_EMS | DST_EMS; |
| 1671 | cd.EMS_PAGE(src_addr) = src_hp->pagenum[src_seg]; |
| 1672 | cd.EMS_OFFS(src_addr) = src_offset; |
| 1673 | cd.EMS_PAGE(dst_addr) = dst_hp->pagenum[dst_seg]; |
| 1674 | cd.EMS_OFFS(dst_addr) = dst_offset; |
| 1675 | cd.rest_len = length; |
| 1676 | |
| 1677 | /* Copy */ |
| 1678 | do { |
| 1679 | map_page(cd.EMS_PAGE(src_addr), 0, src_handle, 0); |
| 1680 | map_page(cd.EMS_PAGE(dst_addr), 1, dst_handle, 0); |
| 1681 | /* If there are more pages, map the next destination page to |
| 1682 | * position 2. This removes a compare between source and dest |
| 1683 | * offsets. |
| 1684 | */ |
| 1685 | if (cd.EMS_PAGE(dst_addr) < dst_hp->npages) |
| 1686 | map_page((cd.EMS_PAGE(dst_addr) + 1), 2, dst_handle, 0); |
| 1687 | copy_block_up(&cd); |
| 1688 | } while(cd.rest_len > 0); |
| 1689 | |
| 1690 | /* Restore the original mapping */ |
| 1691 | restore_context(&ems_saved_context); |
| 1692 | return EMS_SUCCESS; |
| 1693 | } |