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001 /* Copyright (C) 2004 The SOS Team 001 /* Copyright (C) 2004 The SOS Team 002 Copyright (C) 1999 Free Software Foundatio 002 Copyright (C) 1999 Free Software Foundation, Inc. 003 003 004 This program is free software; you can redi 004 This program is free software; you can redistribute it and/or 005 modify it under the terms of the GNU Genera 005 modify it under the terms of the GNU General Public License 006 as published by the Free Software Foundatio 006 as published by the Free Software Foundation; either version 2 007 of the License, or (at your option) any lat 007 of the License, or (at your option) any later version. 008 008 009 This program is distributed in the hope tha 009 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the 010 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU General Public License for more details 012 GNU General Public License for more details. 013 013 014 You should have received a copy of the GNU 014 You should have received a copy of the GNU General Public License 015 along with this program; if not, write to t 015 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place - Suite 3 016 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 017 USA. 017 USA. 018 */ 018 */ 019 019 020 /* Include definitions of the multiboot standa 020 /* Include definitions of the multiboot standard */ 021 #include <bootstrap/multiboot.h> 021 #include <bootstrap/multiboot.h> 022 #include <hwcore/idt.h> 022 #include <hwcore/idt.h> 023 #include <hwcore/gdt.h> 023 #include <hwcore/gdt.h> 024 #include <hwcore/irq.h> 024 #include <hwcore/irq.h> 025 #include <hwcore/exception.h> 025 #include <hwcore/exception.h> 026 #include <hwcore/i8254.h> 026 #include <hwcore/i8254.h> 027 #include <sos/list.h> 027 #include <sos/list.h> 028 #include <sos/physmem.h> 028 #include <sos/physmem.h> 029 #include <hwcore/paging.h> << 030 #include <sos/kmem_vmm.h> << 031 #include <sos/kmalloc.h> << 032 #include <sos/klibc.h> 029 #include <sos/klibc.h> 033 #include <sos/assert.h> 030 #include <sos/assert.h> 034 #include <drivers/x86_videomem.h> 031 #include <drivers/x86_videomem.h> 035 #include <drivers/bochs.h> 032 #include <drivers/bochs.h> 036 033 037 034 038 /* Helper function to display each bits of a 3 035 /* Helper function to display each bits of a 32bits integer on the 039 screen as dark or light carrets */ 036 screen as dark or light carrets */ 040 void display_bits(unsigned char row, unsigned !! 037 static void display_bits(unsigned char row, unsigned char col, 041 unsigned char attribute, !! 038 unsigned char attribute, 042 sos_ui32_t integer) !! 039 sos_ui32_t integer) 043 { 040 { 044 int i; 041 int i; 045 /* Scan each bit of the integer, MSb first * 042 /* Scan each bit of the integer, MSb first */ 046 for (i = 31 ; i >= 0 ; i--) 043 for (i = 31 ; i >= 0 ; i--) 047 { 044 { 048 /* Test if bit i of 'integer' is set */ 045 /* Test if bit i of 'integer' is set */ 049 int bit_i = (integer & (1 << i)); 046 int bit_i = (integer & (1 << i)); 050 /* Ascii 219 => dark carret, Ascii 177 = 047 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 051 unsigned char ascii_code = bit_i?219:177 048 unsigned char ascii_code = bit_i?219:177; 052 sos_x86_videomem_putchar(row, col++, 049 sos_x86_videomem_putchar(row, col++, 053 attribute, 050 attribute, 054 ascii_code); 051 ascii_code); 055 } 052 } 056 } 053 } 057 054 058 055 059 /* Clock IRQ handler */ 056 /* Clock IRQ handler */ 060 static void clk_it(int intid, !! 057 static void clk_it(int intid) 061 const struct sos_cpu_kstate << 062 { 058 { 063 static sos_ui32_t clock_count = 0; 059 static sos_ui32_t clock_count = 0; 064 060 065 display_bits(0, 48, 061 display_bits(0, 48, 066 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 062 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 067 clock_count); 063 clock_count); 068 clock_count++; 064 clock_count++; 069 } << 070 << 071 << 072 /* =========================================== << 073 * Page fault exception handling << 074 */ << 075 << 076 /* Helper function to dump a backtrace on boch << 077 static void dump_backtrace(const struct sos_cp << 078 sos_vaddr_t stack_b << 079 sos_size_t stack_s << 080 sos_bool_t on_conso << 081 sos_bool_t on_bochs << 082 { << 083 static void backtracer(sos_vaddr_t PC, << 084 sos_vaddr_t params, << 085 sos_ui32_t depth, << 086 void *custom_arg) << 087 { << 088 sos_ui32_t invalid = 0xffffffff, *arg1, << 089 << 090 /* Get the address of the first 3 argume << 091 frame. Among these arguments, 0, 1, 2 << 092 meaningful (depending on how many arg << 093 take). */ << 094 arg1 = (sos_ui32_t*)params; << 095 arg2 = (sos_ui32_t*)(params+4); << 096 arg3 = (sos_ui32_t*)(params+8); << 097 arg4 = (sos_ui32_t*)(params+12); << 098 << 099 /* Make sure the addresses of these argu << 100 stack boundaries */ << 101 #define INTERVAL_OK(b,v,u) ( ((b) <= (sos_vadd << 102 && ((sos_vaddr_t) << 103 if (!INTERVAL_OK(stack_bottom, arg1, sta << 104 arg1 = &invalid; << 105 if (!INTERVAL_OK(stack_bottom, arg2, sta << 106 arg2 = &invalid; << 107 if (!INTERVAL_OK(stack_bottom, arg3, sta << 108 arg3 = &invalid; << 109 if (!INTERVAL_OK(stack_bottom, arg4, sta << 110 arg4 = &invalid; << 111 << 112 /* Print the function context for this f << 113 if (on_bochs) << 114 sos_bochs_printf("[%d] PC=0x%x arg1=0x << 115 (unsigned)depth, (uns << 116 (unsigned)*arg1, (uns << 117 (unsigned)*arg3); << 118 << 119 if (on_console) << 120 sos_x86_videomem_printf(23-depth, 3, << 121 SOS_X86_VIDEO_ << 122 | SOS_X86_VI << 123 "[%d] PC=0x%x << 124 (unsigned)dept << 125 (unsigned)*arg << 126 (unsigned)*arg << 127 << 128 } << 129 << 130 sos_backtrace(cpu_kstate, 15, stack_bottom, << 131 } << 132 << 133 << 134 /* Page fault exception handler with demand pa << 135 static void pgflt_ex(int intid, const struct s << 136 { << 137 static sos_ui32_t demand_paging_count = 0; << 138 sos_vaddr_t faulting_vaddr = sos_cpu_kstate_ << 139 sos_paddr_t ppage_paddr; << 140 << 141 /* Check if address is covered by any VMM ra << 142 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v << 143 { << 144 /* No: The page fault is out of any kern << 145 the moment, we don't handle this. */ << 146 dump_backtrace(ctxt, << 147 bootstrap_stack_bottom, << 148 bootstrap_stack_size, << 149 TRUE, TRUE); << 150 sos_display_fatal_error("Unresolved page << 151 (unsigned)faulti << 152 (unsigned)sos_cp << 153 SOS_ASSERT_FATAL(! "Got page fault (note << 154 } << 155 << 156 << 157 /* << 158 * Demand paging << 159 */ << 160 << 161 /* Update the number of demand paging reques << 162 demand_paging_count ++; << 163 display_bits(0, 0, << 164 SOS_X86_VIDEO_FG_LTRED | SOS_X8 << 165 demand_paging_count); << 166 << 167 /* Allocate a new page for the virtual addre << 168 ppage_paddr = sos_physmem_ref_physpage_new(F << 169 if (! ppage_paddr) << 170 SOS_ASSERT_FATAL(! "TODO: implement swap. << 171 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp << 172 SO << 173 FA << 174 SO << 175 | << 176 | << 177 sos_physmem_unref_physpage(ppage_paddr); << 178 << 179 /* Ok, we can now return to interrupted cont << 180 } << 181 << 182 << 183 << 184 /* =========================================== << 185 * Demonstrate the use of the CPU kernet conte << 186 * - A coroutine prints "Hlowrd" and switches << 187 * letter << 188 * - A coroutine prints "el ol\n" and switche << 189 * each letter. << 190 * The first to reach the '\n' returns back to << 191 */ << 192 struct sos_cpu_kstate *ctxt_hello1; << 193 struct sos_cpu_kstate *ctxt_hello2; << 194 struct sos_cpu_kstate *ctxt_main; << 195 sos_vaddr_t hello1_stack, hello2_stack; << 196 << 197 static void reclaim_stack(sos_vaddr_t stack_va << 198 { << 199 sos_kfree(stack_vaddr); << 200 } << 201 << 202 << 203 static void exit_hello12(sos_vaddr_t stack_vad << 204 { << 205 sos_cpu_kstate_exit_to(ctxt_main, << 206 (sos_cpu_kstate_funct << 207 stack_vaddr); << 208 } << 209 << 210 << 211 static void hello1 (char *str) << 212 { << 213 for ( ; *str != '\n' ; str++) << 214 { << 215 sos_bochs_printf("hello1: %c\n", *str); << 216 sos_cpu_kstate_switch(& ctxt_hello1, ctx << 217 } << 218 << 219 /* You can uncomment this in case you explic << 220 now. But returning from the function will << 221 /* sos_cpu_kstate_exit_to(ctxt_main, << 222 (sos_cpu_kstate_funct << 223 hello1_stack); */ << 224 } << 225 << 226 << 227 static void hello2 (char *str) << 228 { << 229 for ( ; *str != '\n' ; str++) << 230 { << 231 sos_bochs_printf("hello2: %c\n", *str); << 232 sos_cpu_kstate_switch(& ctxt_hello2, ctx << 233 } << 234 << 235 /* You can uncomment this in case you explic << 236 now. But returning from the function will << 237 /* sos_cpu_kstate_exit_to(ctxt_main, << 238 (sos_cpu_kstate_funct << 239 hello2_stack); */ << 240 } << 241 << 242 << 243 void print_hello_world () << 244 { << 245 #define DEMO_STACK_SIZE 1024 << 246 /* Allocate the stacks */ << 247 hello1_stack = sos_kmalloc(DEMO_STACK_SIZE, << 248 hello2_stack = sos_kmalloc(DEMO_STACK_SIZE, << 249 << 250 /* Initialize the coroutines' contexts */ << 251 sos_cpu_kstate_init(&ctxt_hello1, << 252 (sos_cpu_kstate_function << 253 (sos_ui32_t) "Hlowrd", << 254 (sos_vaddr_t) hello1_sta << 255 (sos_cpu_kstate_function << 256 (sos_ui32_t) hello1_stac << 257 sos_cpu_kstate_init(&ctxt_hello2, << 258 (sos_cpu_kstate_function << 259 (sos_ui32_t) "el ol\n", << 260 (sos_vaddr_t) hello2_sta << 261 (sos_cpu_kstate_function << 262 (sos_ui32_t) hello2_stac << 263 << 264 /* Go to first coroutine */ << 265 sos_bochs_printf("Printing Hello World\\n... << 266 sos_cpu_kstate_switch(& ctxt_main, ctxt_hell << 267 << 268 /* The first coroutine to reach the '\n' swi << 269 sos_bochs_printf("Back in main !\n"); << 270 } << 271 << 272 << 273 /* =========================================== << 274 * Generate page faults on an unmapped but all << 275 * region, which results in a series of physic << 276 * faulted pages. << 277 */ << 278 static void test_demand_paging(int nb_alloc_vp << 279 { << 280 int i; << 281 sos_vaddr_t base_vaddr; << 282 << 283 sos_x86_videomem_printf(10, 0, << 284 SOS_X86_VIDEO_BG_BLU << 285 "Demand paging test << 286 nb_alloc_vpages >> 8 << 287 << 288 /* Allocate virtual memory */ << 289 base_vaddr = sos_kmem_vmm_alloc(nb_alloc_vpa << 290 << 291 SOS_ASSERT_FATAL(base_vaddr != (sos_vaddr_t) << 292 sos_x86_videomem_printf(11, 0, << 293 SOS_X86_VIDEO_BG_BLU << 294 "Allocated virtual r << 295 base_vaddr, << 296 base_vaddr + nb_allo << 297 << 298 /* Now use part of it in physical memory */ << 299 for (i = 0 ; (i < nb_alloc_ppages) && (i < n << 300 { << 301 /* Compute an address inside the range * << 302 sos_ui32_t *value, j; << 303 sos_vaddr_t vaddr = base_vaddr; << 304 vaddr += (nb_alloc_vpages - (i + 1))*SOS << 305 vaddr += 2345; << 306 << 307 sos_x86_videomem_printf(12, 0, << 308 SOS_X86_VIDEO_BG << 309 "Writing %d at v << 310 i, vaddr); << 311 << 312 /* Write at this address */ << 313 value = (sos_ui32_t*)vaddr; << 314 *value = i; << 315 << 316 /* Yep ! A new page should normally have << 317 sos_x86_videomem_printf(13, 0, << 318 SOS_X86_VIDEO_BG << 319 "Value read at a << 320 vaddr, (unsigned << 321 } << 322 << 323 SOS_ASSERT_FATAL(SOS_OK == sos_kmem_vmm_free << 324 /* Yep ! A new page should normally have bee << 325 sos_x86_videomem_printf(14, 0, << 326 SOS_X86_VIDEO_BG_BLU << 327 "Done (area un-alloc << 328 } << 329 << 330 << 331 << 332 /* =========================================== << 333 * Shows how the backtrace stuff works << 334 */ << 335 << 336 /* Recursive function. Print the backtrace fro << 337 static void test_backtrace(int i, int magic, s << 338 sos_size_t stack_s << 339 { << 340 if (i <= 0) << 341 { << 342 /* The page fault exception handler will << 343 this function, because address 0x42 i << 344 *((char*)0x42) = 12; << 345 << 346 /* More direct variant: */ << 347 /* dump_backtrace(NULL, stack_bottom, st << 348 } << 349 else << 350 test_backtrace(i-1, magic, stack_bottom, s << 351 } << 352 << 353 << 354 /* =========================================== << 355 * Parsing of Mathematical expressions << 356 * << 357 * This is a recursive lexer/parser/evaluator << 358 * expressions. Supports both binary +/-* and << 359 * well as parentheses. << 360 * << 361 * Terminal tokens (Lexer): << 362 * - Number: positive integer number << 363 * - Variable: ascii name (regexp: [a-zA-Z]+) << 364 * - Operator: +*-/ << 365 * - Opening/closing parentheses << 366 * << 367 * Grammar (Parser): << 368 * Expression ::= Term E' << 369 * Expr_lr ::= + Term Expr_lr | - Term Exp << 370 * Term ::= Factor Term_lr << 371 * Term_lr ::= * Factor Term_lr | / Factor << 372 * Factor ::= - Factor | + Factor | Scala << 373 * Scalar ::= Number | Variable << 374 * << 375 * Note. This is the left-recursive equivalent << 376 * Expression ::= Expression + Term | Express << 377 * Term ::= Term * Factor | Term / Fact << 378 * factor ::= - Factor | + Factor | Scala << 379 * Scalar ::= Number | Variable << 380 * << 381 * The parsing is composed of a 3 stages pipel << 382 * - The reader: reads a string 1 character a << 383 * the control back to lexer after each cha << 384 * interest in using coroutines, because it << 385 * implicitely stored in the stack between << 386 * - The lexer: consumes the characters from << 387 * the terminal tokens, 1 token at a time, << 388 * to the parser after each token. This fun << 389 * in using coroutines, because its state ( << 390 * implicitely stored in the stack between << 391 * - The parser: consumes the tokens from the << 392 * syntax tree of the expression. There is << 393 * interest in defining a coroutine devoted << 394 * do use one for that because this allows << 395 * deeper stack. Actually, the parser is hi << 396 * the default 16kB stack of the sos_main() << 397 * enough. Here, we switch to a 64kB stack, << 398 * recursive functions. The Parser uses int << 399 * are defined and implemented as internal << 400 * just for the sake of clarity, and is abs << 401 * the algorithm: one can transfer these fu << 402 * function without restriction. << 403 * << 404 * The evaluator is another recursive function << 405 * parser's stack to evaluate the parsed expre << 406 * values for the variables present in the exp << 407 * parser function, this function defines and << 408 * which can be extracted from the main evalua << 409 * << 410 * All these functions support a kind of "exce << 411 * something goes wrong, control is transferre << 412 * sos_main() context, without unrolling the r << 413 * how exceptions basically work, but one shou << 414 * a reference exceptions implementation. Real << 415 * (such as that in the C++ language) call the << 416 * objects allocated on the stack during the " << 417 * upon exception handling, which complicates << 418 * don't have real Objects here (in the OOP se << 419 * destructors), so we don't have to complicat << 420 * << 421 * After this little coroutine demo, one shoul << 422 * a low-level manual direct manipulation of s << 423 * probably mess up the whole kernel to do wha << 424 * resources such as mutex/semaphore won't be << 425 * ...). Higher level "kernel thread" primitiv << 426 * presented, which provide a higher-level set << 427 * contexts. You'll have to use EXCLUSIVELY th << 428 * need a huge stack to do recursion for examp << 429 * think of changing manually the stack for so << 430 * rethink your algorithm, making it non-recur << 431 */ << 432 << 433 << 434 /* The stacks involved */ << 435 static char stack_reader[1024]; << 436 static char stack_lexer[1024]; << 437 static char deep_stack[65536]; /* For the pars << 438 << 439 /* The CPU states for the various coroutines * << 440 static struct sos_cpu_kstate *st_reader, *st_l << 441 *st_eval, *st_free, *st_main; << 442 << 443 << 444 /* << 445 * Default exit/reclaim functions: return cont << 446 * context << 447 */ << 448 static void reclaim(int unused) << 449 { << 450 } << 451 static void func_exit(sos_ui32_t unused) << 452 { << 453 sos_cpu_kstate_exit_to(st_main, (sos_cpu_kst << 454 } << 455 << 456 << 457 /* << 458 * The reader coroutine and associated variabl << 459 * have been a normal function, except that th << 460 * character would have to be stored somewhere << 461 */ << 462 static char data_reader_to_lexer; << 463 << 464 static void func_reader(const char *str) << 465 { << 466 for ( ; str && (*str != '\0') ; str++) << 467 { << 468 data_reader_to_lexer = *str; << 469 sos_cpu_kstate_switch(& st_reader, st_le << 470 } << 471 << 472 data_reader_to_lexer = '\0'; << 473 sos_cpu_kstate_switch(& st_reader, st_lexer) << 474 } << 475 << 476 << 477 /* << 478 * The Lexer coroutine and associated types/va << 479 * could have been a normal function, except t << 480 * character, token and previous token would h << 481 * somewhere. << 482 */ << 483 #define STR_VAR_MAXLEN 16 << 484 static struct lex_elem << 485 { << 486 enum { LEX_IS_NUMBER, LEX_IS_OPER, LEX_IS_VA << 487 LEX_IS_OPENPAR, LEX_IS_CLOSEPAR, LEX_ << 488 union { << 489 int number; << 490 char operator; << 491 char var[STR_VAR_MAXLEN]; << 492 }; << 493 } data_lexer_to_parser; << 494 << 495 static void func_lexer(sos_ui32_t unused) << 496 { << 497 char c; << 498 enum { GOT_SPACE, GOT_NUM, GOT_OP, GOT_STR, << 499 GOT_OPENPAR, GOT_CLOSEPAR } got_what, << 500 << 501 data_lexer_to_parser.number = 0; << 502 got_what_before = GOT_SPACE; << 503 do << 504 { << 505 /* Consume one character from the reader << 506 sos_cpu_kstate_switch(& st_lexer, st_rea << 507 c = data_reader_to_lexer; << 508 << 509 /* Classify the consumed character */ << 510 if ( (c >= '0') && (c <= '9') ) << 511 got_what = GOT_NUM; << 512 else if ( (c == '+') || (c == '-') || (c << 513 got_what = GOT_OP; << 514 else if ( ( (c >= 'a') && (c <= 'z') ) << 515 || ( (c >= 'A') && (c <= 'Z') << 516 got_what = GOT_STR; << 517 else if (c == '(') << 518 got_what = GOT_OPENPAR; << 519 else if (c == ')') << 520 got_what = GOT_CLOSEPAR; << 521 else << 522 got_what = GOT_SPACE; << 523 << 524 /* Determine whether the current token i << 525 if ( (got_what != got_what_before) << 526 || (got_what_before == GOT_OP) << 527 || (got_what_before == GOT_OPENPAR) << 528 || (got_what_before == GOT_CLOSEPAR << 529 { << 530 /* return control back to the parser << 531 has been recognized */ << 532 if ( (got_what_before != GOT_SPACE) << 533 sos_cpu_kstate_switch(& st_lexer, << 534 << 535 data_lexer_to_parser.number = 0; << 536 } << 537 << 538 /* Update the token being currently reco << 539 if (got_what == GOT_OP) << 540 { << 541 data_lexer_to_parser.type = LEX_IS_O << 542 data_lexer_to_parser.operator = c; << 543 } << 544 else if (got_what == GOT_NUM) << 545 { << 546 data_lexer_to_parser.type = LEX_IS_N << 547 data_lexer_to_parser.number *= 10; << 548 data_lexer_to_parser.number += (c - << 549 } << 550 else if (got_what == GOT_STR) << 551 { << 552 char to_cat[] = { c, '\0' }; << 553 data_lexer_to_parser.type = LEX_IS_V << 554 strzcat(data_lexer_to_parser.var, to << 555 } << 556 else if (got_what == GOT_OPENPAR) << 557 data_lexer_to_parser.type = LEX_IS_OPE << 558 else if (got_what == GOT_CLOSEPAR) << 559 data_lexer_to_parser.type = LEX_IS_CLO << 560 << 561 got_what_before = got_what; << 562 } << 563 while (c != '\0'); << 564 065 565 /* Transfer last recognized token to the par << 566 if ( (got_what_before != GOT_SPACE) ) << 567 sos_cpu_kstate_switch(& st_lexer, st_parse << 568 << 569 /* Signal that no more token are available * << 570 data_lexer_to_parser.type = LEX_END; << 571 sos_cpu_kstate_switch(& st_lexer, st_parser) << 572 << 573 /* Exception: parser asks for a token AFTER << 574 one */ << 575 sos_bochs_printf("Error: end of string alrea << 576 sos_cpu_kstate_switch(& st_lexer, st_main); << 577 } 066 } 578 067 579 !! 068 #define MY_PPAGE_NUM_INT 511 580 /* !! 069 struct my_ppage 581 * The Parser coroutine and associated types/v << 582 */ << 583 struct syntax_node << 584 { << 585 enum { YY_IS_BINOP, YY_IS_UNAROP, YY_IS_NUM, << 586 union << 587 { << 588 int number; << 589 char var[STR_VAR_MAXLEN]; << 590 struct << 591 { << 592 char op; << 593 struct syntax_node *parm_left, *parm_rig << 594 } binop; << 595 struct << 596 { << 597 char op; << 598 struct syntax_node *parm; << 599 } unarop; << 600 }; << 601 }; << 602 << 603 static void func_parser(struct syntax_node ** << 604 { << 605 static struct syntax_node *alloc_node_num(in << 606 static struct syntax_node *alloc_node_var(co << 607 static struct syntax_node *alloc_node_binop( << 608 << 609 << 610 static struct syntax_node *alloc_node_unarop << 611 << 612 static struct syntax_node * get_expr(); << 613 static struct syntax_node * get_expr_lr(stru << 614 static struct syntax_node * get_term(); << 615 static struct syntax_node * get_term_lr(stru << 616 static struct syntax_node * get_factor(); << 617 static struct syntax_node * get_scalar(); << 618 << 619 /* Create a new node to store a number */ << 620 static struct syntax_node *alloc_node_num(in << 621 { << 622 struct syntax_node *n << 623 = (struct syntax_node*) sos_kmalloc(si << 624 n->type = YY_IS_NUM; << 625 n->number = val; << 626 return n; << 627 } << 628 /* Create a new node to store a variable */ << 629 static struct syntax_node *alloc_node_var(co << 630 { << 631 struct syntax_node *n << 632 = (struct syntax_node*) sos_kmalloc(si << 633 n->type = YY_IS_VAR; << 634 strzcpy(n->var, name, STR_VAR_MAXLEN); << 635 return n; << 636 } << 637 /* Create a new node to store a binary opera << 638 static struct syntax_node *alloc_node_binop( << 639 << 640 << 641 { << 642 struct syntax_node *n << 643 = (struct syntax_node*) sos_kmalloc(si << 644 n->type = YY_IS_BINOP; << 645 n->binop.op = op; << 646 n->binop.parm_left = parm_left; << 647 n->binop.parm_right = parm_right; << 648 return n; << 649 } << 650 /* Create a new node to store a unary operat << 651 static struct syntax_node *alloc_node_unarop << 652 << 653 { << 654 struct syntax_node *n << 655 = (struct syntax_node*) sos_kmalloc(si << 656 n->type = YY_IS_UNAROP; << 657 n->unarop.op = op; << 658 n->unarop.parm = parm; << 659 return n; << 660 } << 661 << 662 /* Raise an exception: transfer control back << 663 without unrolling the whole recursion */ << 664 static void parser_exception(const char *str << 665 { << 666 sos_bochs_printf("Parser exception: %s\n << 667 sos_cpu_kstate_switch(& st_parser, st_ma << 668 } << 669 << 670 /* Consume the current terminal "number" tok << 671 token */ << 672 static int get_number() << 673 { << 674 int v; << 675 if (data_lexer_to_parser.type != LEX_IS_ << 676 parser_exception("Expected number"); << 677 v = data_lexer_to_parser.number; << 678 sos_cpu_kstate_switch(& st_parser, st_le << 679 return v; << 680 } << 681 /* Consume the current terminal "variable" t << 682 token */ << 683 static void get_str(char name[STR_VAR_MAXLEN << 684 { << 685 if (data_lexer_to_parser.type != LEX_IS_ << 686 parser_exception("Expected variable"); << 687 strzcpy(name, data_lexer_to_parser.var, << 688 sos_cpu_kstate_switch(& st_parser, st_le << 689 } << 690 /* Consume the current terminal "operator" t << 691 token */ << 692 static char get_op() << 693 { << 694 char op; << 695 if (data_lexer_to_parser.type != LEX_IS_ << 696 parser_exception("Expected operator"); << 697 op = data_lexer_to_parser.operator; << 698 sos_cpu_kstate_switch(& st_parser, st_le << 699 return op; << 700 } << 701 /* Consume the current terminal "parenthese" << 702 token */ << 703 static void get_par() << 704 { << 705 if ( (data_lexer_to_parser.type != LEX_I << 706 && (data_lexer_to_parser.type != LE << 707 parser_exception("Expected parenthese" << 708 sos_cpu_kstate_switch(& st_parser, st_le << 709 } << 710 << 711 /* Parse an Expression */ << 712 static struct syntax_node * get_expr() << 713 { << 714 struct syntax_node *t = get_term(); << 715 return get_expr_lr(t); << 716 } << 717 /* Parse an Expr_lr */ << 718 static struct syntax_node * get_expr_lr(stru << 719 { << 720 if ( (data_lexer_to_parser.type == LEX_I << 721 && ( (data_lexer_to_parser.operator << 722 || (data_lexer_to_parser.opera << 723 { << 724 char op = get_op(); << 725 struct syntax_node *term = get_term( << 726 struct syntax_node *node_op = alloc_ << 727 return get_expr_lr(node_op); << 728 } << 729 return n; << 730 } << 731 /* Parse a Term */ << 732 static struct syntax_node * get_term() << 733 { << 734 struct syntax_node *f1 = get_factor(); << 735 return get_term_lr(f1); << 736 } << 737 /* Parse a Term_lr */ << 738 static struct syntax_node * get_term_lr(stru << 739 { << 740 if ( (data_lexer_to_parser.type == LEX_I << 741 && ( (data_lexer_to_parser.operator << 742 || (data_lexer_to_parser.opera << 743 { << 744 char op = get_op(); << 745 struct syntax_node *factor = get_fac << 746 struct syntax_node *node_op = alloc_ << 747 return get_term_lr(node_op); << 748 } << 749 return n; << 750 } << 751 /* Parse a Factor */ << 752 static struct syntax_node * get_factor() << 753 { << 754 if ( (data_lexer_to_parser.type == LEX_I << 755 && ( (data_lexer_to_parser.operator << 756 || (data_lexer_to_parser.opera << 757 { char op = data_lexer_to_parser.opera << 758 get_op(); return alloc_node_unarop(op, << 759 else if (data_lexer_to_parser.type == LE << 760 { << 761 struct syntax_node *expr; << 762 get_par(); << 763 expr = get_expr(); << 764 if (data_lexer_to_parser.type != LEX << 765 parser_exception("Mismatched paren << 766 get_par(); << 767 return expr; << 768 } << 769 << 770 return get_scalar(); << 771 } << 772 /* Parse a Scalar */ << 773 static struct syntax_node * get_scalar() << 774 { << 775 if (data_lexer_to_parser.type != LEX_IS_ << 776 { << 777 char var[STR_VAR_MAXLEN]; << 778 get_str(var); << 779 return alloc_node_var(var); << 780 } << 781 return alloc_node_num(get_number()); << 782 } << 783 << 784 << 785 /* << 786 * Body of the function << 787 */ << 788 << 789 /* Get the first token */ << 790 sos_cpu_kstate_switch(& st_parser, st_lexer) << 791 << 792 /* Begin the parsing ! */ << 793 *syntax_tree = get_expr(); << 794 /* The result is returned in the syntax_tree << 795 } << 796 << 797 << 798 /* << 799 * Setup the parser's pipeline << 800 */ << 801 static struct syntax_node * parse_expression(c << 802 { << 803 struct syntax_node *retval = NULL; << 804 << 805 /* Build the context of the functions in the << 806 sos_cpu_kstate_init(& st_reader, << 807 (sos_cpu_kstate_function << 808 (sos_ui32_t)expr, << 809 (sos_vaddr_t)stack_reade << 810 (sos_cpu_kstate_function << 811 sos_cpu_kstate_init(& st_lexer, << 812 (sos_cpu_kstate_function << 813 0, << 814 (sos_vaddr_t)stack_lexer << 815 (sos_cpu_kstate_function << 816 sos_cpu_kstate_init(& st_parser, << 817 (sos_cpu_kstate_function << 818 (sos_ui32_t) /* syntax t << 819 (sos_vaddr_t)deep_stack, << 820 (sos_cpu_kstate_function << 821 << 822 /* Parse the expression */ << 823 sos_cpu_kstate_switch(& st_main, st_parser); << 824 return retval; << 825 } << 826 << 827 << 828 /* << 829 * The Evaluator coroutine and associated type << 830 */ << 831 struct func_eval_params << 832 { << 833 const struct syntax_node *e; << 834 const char **var_name; << 835 int *var_val; << 836 int nb_vars; << 837 << 838 int result; << 839 }; << 840 << 841 static void func_eval(struct func_eval_params << 842 { << 843 /* The internal (recursive) nested function << 844 the syntax tree */ << 845 static int rec_eval(const struct syntax_node << 846 const char* var_name[], << 847 { << 848 switch (n->type) << 849 { << 850 case YY_IS_NUM: << 851 return n->number; << 852 << 853 case YY_IS_VAR: << 854 { << 855 int i; << 856 for (i = 0 ; i < nb_vars ; i++) << 857 if (0 == strcmp(var_name[i], n-> << 858 return var_val[i]; << 859 << 860 /* Exception: no variable with tha << 861 sos_bochs_printf("ERROR: unknown v << 862 sos_cpu_kstate_switch(& st_eval, s << 863 } << 864 << 865 case YY_IS_BINOP: << 866 { << 867 int left = rec_eval(n->binop.parm_ << 868 var_name, var_ << 869 int right = rec_eval(n->binop.parm << 870 var_name, var << 871 switch (n->binop.op) << 872 { << 873 case '+': return left + right; << 874 case '-': return left - right; << 875 case '*': return left * right; << 876 case '/': return left / right; << 877 default: << 878 /* Exception: no such operator << 879 sos_bochs_printf("ERROR: unkno << 880 sos_cpu_kstate_switch(& st_eva << 881 } << 882 } << 883 << 884 case YY_IS_UNAROP: << 885 { << 886 int arg = rec_eval(n->unarop.parm, << 887 switch (n->unarop.op) << 888 { << 889 case '-': return -arg; << 890 case '+': return arg; << 891 default: << 892 /* Exception: no such operator << 893 sos_bochs_printf("ERROR: unkno << 894 sos_cpu_kstate_switch(& st_eva << 895 } << 896 } << 897 } << 898 << 899 /* Exception: no such syntax node (INTER << 900 sos_bochs_printf("ERROR: invalid node ty << 901 sos_cpu_kstate_switch(& st_eval, st_main << 902 return -1; /* let's make gcc happy */ << 903 } << 904 << 905 << 906 /* << 907 * Function BODY << 908 */ << 909 /* Update p.result returned back to calling << 910 parms->result << 911 = rec_eval(parms->e, parms->var_name, parm << 912 } << 913 << 914 /* << 915 * Change the stack for something larger in or << 916 * recursive function above in a safe way << 917 */ << 918 static int eval_expression(const struct syntax << 919 const char* var_nam << 920 { << 921 struct func_eval_params p << 922 = (struct func_eval_params){ .e=e, << 923 .var_name=var << 924 .var_val=var_ << 925 .nb_vars=nb_v << 926 .result = 0 } << 927 << 928 sos_cpu_kstate_init(& st_eval, << 929 (sos_cpu_kstate_function << 930 (sos_ui32_t)/* p.result << 931 (sos_vaddr_t)deep_stack, << 932 (sos_cpu_kstate_function << 933 << 934 /* Go ! */ << 935 sos_cpu_kstate_switch(& st_main, st_eval); << 936 return p.result; << 937 } << 938 << 939 << 940 /* << 941 * Function to free the syntax tree << 942 */ << 943 static void func_free(struct syntax_node *n) << 944 { 070 { 945 switch (n->type) !! 071 sos_ui32_t before[MY_PPAGE_NUM_INT]; >> 072 struct my_ppage *prev, *next; >> 073 sos_ui32_t after[MY_PPAGE_NUM_INT]; >> 074 }; /* sizeof() Must be <= 4kB */ >> 075 >> 076 static void test_physmem() >> 077 { >> 078 /* We place the pages we did allocate here */ >> 079 struct my_ppage *ppage_list, *my_ppage; >> 080 sos_count_t num_alloc_ppages = 0, num_free_ppages = 0; >> 081 >> 082 ppage_list = NULL; >> 083 while ((my_ppage = (struct my_ppage*)sos_physmem_ref_physpage_new(FALSE)) >> 084 != NULL) 946 { 085 { 947 case YY_IS_NUM: !! 086 int i; 948 case YY_IS_VAR: !! 087 num_alloc_ppages++; 949 break; << 950 << 951 case YY_IS_BINOP: << 952 func_free(n->binop.parm_left); << 953 func_free(n->binop.parm_right); << 954 break; << 955 088 956 case YY_IS_UNAROP: !! 089 /* Print the allocation status */ 957 func_free(n->unarop.parm); !! 090 sos_x86_videomem_printf(2, 0, 958 break; !! 091 SOS_X86_VIDEO_FG_YELLOW 959 } !! 092 | SOS_X86_VIDEO_BG_BLUE, 960 !! 093 "Could allocate %d pages ", 961 sos_kfree((sos_vaddr_t)n); !! 094 num_alloc_ppages); 962 } !! 095 >> 096 /* We fill this page with its address */ >> 097 for (i = 0 ; i < MY_PPAGE_NUM_INT ; i++) >> 098 my_ppage->before[i] = my_ppage->after[i] = (sos_ui32_t)my_ppage; >> 099 >> 100 /* We add this page at the tail of our list of ppages */ >> 101 list_add_tail(ppage_list, my_ppage); >> 102 } >> 103 >> 104 /* Now we release these pages in FIFO order */ >> 105 while ((my_ppage = list_pop_head(ppage_list)) != NULL) >> 106 { >> 107 /* We make sure this page was not overwritten by any unexpected >> 108 value */ >> 109 int i; >> 110 for (i = 0 ; i < MY_PPAGE_NUM_INT ; i++) >> 111 { >> 112 /* We don't get what we expect ! */ >> 113 if ((my_ppage->before[i] != (sos_ui32_t)my_ppage) >> 114 || (my_ppage->after[i] != (sos_ui32_t)my_ppage)) >> 115 { >> 116 /* STOP ! */ >> 117 sos_x86_videomem_putstring(20, 0, >> 118 SOS_X86_VIDEO_FG_LTRED >> 119 | SOS_X86_VIDEO_BG_BLUE, >> 120 "Page overwritten"); >> 121 return; >> 122 } >> 123 } >> 124 >> 125 /* Release the descriptor */ >> 126 if (sos_physmem_unref_physpage((sos_paddr_t)my_ppage) < 0) >> 127 { >> 128 /* STOP ! */ >> 129 sos_x86_videomem_putstring(20, 0, >> 130 SOS_X86_VIDEO_FG_LTRED >> 131 | SOS_X86_VIDEO_BG_BLUE, >> 132 "Cannot release page"); >> 133 return; >> 134 } >> 135 >> 136 /* Print the deallocation status */ >> 137 num_free_ppages ++; >> 138 sos_x86_videomem_printf(2, 0, >> 139 SOS_X86_VIDEO_FG_YELLOW >> 140 | SOS_X86_VIDEO_BG_BLUE, >> 141 "Could free %d pages ", >> 142 num_free_ppages); >> 143 } >> 144 >> 145 /* Print the overall stats */ >> 146 sos_x86_videomem_printf(2, 0, >> 147 SOS_X86_VIDEO_FG_LTGREEN >> 148 | SOS_X86_VIDEO_BG_BLUE, >> 149 "Could allocate %d bytes, could free %d bytes ", >> 150 num_alloc_ppages << SOS_PAGE_SHIFT, >> 151 num_free_ppages << SOS_PAGE_SHIFT); 963 152 964 /* !! 153 SOS_ASSERT_FATAL(num_alloc_ppages == num_free_ppages); 965 * Change the stack for something larger in or << 966 * recursive function above in a safe way << 967 */ << 968 static void free_syntax_tree(struct syntax_nod << 969 { << 970 sos_cpu_kstate_init(& st_free, << 971 (sos_cpu_kstate_function << 972 (sos_ui32_t)tree, << 973 (sos_vaddr_t)deep_stack, << 974 (sos_cpu_kstate_function << 975 << 976 /* Go ! */ << 977 sos_cpu_kstate_switch(& st_main, st_free); << 978 } 154 } 979 155 980 156 981 /* =========================================== !! 157 /* The C entry point of our operating system */ 982 * The C entry point of our operating system << 983 */ << 984 void sos_main(unsigned long magic, unsigned lo 158 void sos_main(unsigned long magic, unsigned long addr) 985 { 159 { 986 unsigned i; 160 unsigned i; 987 sos_paddr_t sos_kernel_core_base_paddr, sos_ 161 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 988 struct syntax_node *syntax_tree; << 989 162 990 /* Grub sends us a structure, called multibo 163 /* Grub sends us a structure, called multiboot_info_t with a lot of 991 precious informations about the system, s 164 precious informations about the system, see the multiboot 992 documentation for more information. */ 165 documentation for more information. */ 993 multiboot_info_t *mbi; 166 multiboot_info_t *mbi; 994 mbi = (multiboot_info_t *) addr; 167 mbi = (multiboot_info_t *) addr; 995 168 996 /* Setup bochs and console, and clear the co 169 /* Setup bochs and console, and clear the console */ 997 sos_bochs_setup(); 170 sos_bochs_setup(); 998 171 999 sos_x86_videomem_setup(); 172 sos_x86_videomem_setup(); 1000 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE) 173 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 1001 174 1002 /* Greetings from SOS */ 175 /* Greetings from SOS */ 1003 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 176 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 1004 /* Loaded with Grub */ 177 /* Loaded with Grub */ 1005 sos_x86_videomem_printf(1, 0, 178 sos_x86_videomem_printf(1, 0, 1006 SOS_X86_VIDEO_FG_ 179 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 1007 "Welcome From GRU 180 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 1008 "SOS", ',', 181 "SOS", ',', 1009 (unsigned)(mbi->m 182 (unsigned)(mbi->mem_upper >> 10) + 1, 1010 (unsigned)mbi->me 183 (unsigned)mbi->mem_upper); 1011 else 184 else 1012 /* Not loaded with grub */ 185 /* Not loaded with grub */ 1013 sos_x86_videomem_printf(1, 0, 186 sos_x86_videomem_printf(1, 0, 1014 SOS_X86_VIDEO_FG_ 187 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 1015 "Welcome to SOS") 188 "Welcome to SOS"); 1016 189 1017 sos_bochs_putstring("Message in a bochs\n") 190 sos_bochs_putstring("Message in a bochs\n"); 1018 191 1019 /* Setup CPU segmentation and IRQ subsystem 192 /* Setup CPU segmentation and IRQ subsystem */ 1020 sos_gdt_subsystem_setup(); !! 193 sos_gdt_setup(); 1021 sos_idt_subsystem_setup(); !! 194 sos_idt_setup(); 1022 195 1023 /* Setup SOS IRQs and exceptions subsystem 196 /* Setup SOS IRQs and exceptions subsystem */ 1024 sos_exception_subsystem_setup(); !! 197 sos_exceptions_setup(); 1025 sos_irq_subsystem_setup(); !! 198 sos_irq_setup(); 1026 199 1027 /* Configure the timer so as to raise the I 200 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 1028 sos_i8254_set_frequency(100); 201 sos_i8254_set_frequency(100); 1029 202 >> 203 1030 /* We need a multiboot-compliant boot loade 204 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 1031 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 205 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 1032 { 206 { 1033 sos_x86_videomem_putstring(20, 0, 207 sos_x86_videomem_putstring(20, 0, 1034 SOS_X86_VIDE 208 SOS_X86_VIDEO_FG_LTRED 1035 | SOS_X86_ 209 | SOS_X86_VIDEO_BG_BLUE 1036 | SOS_X86_ 210 | SOS_X86_VIDEO_FG_BLINKING, 1037 "I'm not loa 211 "I'm not loaded with Grub !"); 1038 /* STOP ! */ 212 /* STOP ! */ 1039 for (;;) 213 for (;;) 1040 continue; 214 continue; 1041 } 215 } 1042 216 1043 /* << 1044 * Some interrupt handlers << 1045 */ << 1046 << 1047 /* Binding some HW interrupts and exception 217 /* Binding some HW interrupts and exceptions to software routines */ 1048 sos_irq_set_routine(SOS_IRQ_TIMER, 218 sos_irq_set_routine(SOS_IRQ_TIMER, 1049 clk_it); !! 219 clk_it); 1050 !! 220 /* Enabling the HW interrupts here, this will make the timer HW 1051 /* !! 221 interrupt call our clk_it handler */ 1052 * Setup physical memory management !! 222 asm volatile ("sti\n"); 1053 */ << 1054 << 1055 /* Multiboot says: "The value returned for 223 /* Multiboot says: "The value returned for upper memory is maximally 1056 the address of the first upper memory ho 224 the address of the first upper memory hole minus 1 megabyte.". It 1057 also adds: "It is not guaranteed to be t 225 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 1058 sos_physmem_subsystem_setup((mbi->mem_upper !! 226 sos_physmem_setup((mbi->mem_upper<<10) + (1<<20), 1059 & sos_kernel_co !! 227 & sos_kernel_core_base_paddr, 1060 & sos_kernel_co !! 228 & sos_kernel_core_top_paddr); 1061 !! 229 test_physmem(); 1062 /* << 1063 * Switch to paged-memory mode << 1064 */ << 1065 << 1066 /* Disabling interrupts should seem more co << 1067 necessary at this stage */ << 1068 SOS_ASSERT_FATAL(SOS_OK == << 1069 sos_paging_subsystem_setup << 1070 << 1071 << 1072 /* Bind the page fault exception */ << 1073 sos_exception_set_routine(SOS_EXCEPT_PAGE_F << 1074 pgflt_ex); << 1075 << 1076 /* << 1077 * Setup kernel virtual memory allocator << 1078 */ << 1079 << 1080 if (sos_kmem_vmm_subsystem_setup(sos_kernel << 1081 sos_kernel << 1082 bootstrap_ << 1083 bootstrap_ << 1084 + bootstra << 1085 sos_bochs_printf("Could not setup the Ker << 1086 << 1087 if (sos_kmalloc_subsystem_setup()) << 1088 sos_bochs_printf("Could not setup the Kma << 1089 << 1090 /* << 1091 * Enabling the HW interrupts here, this wi << 1092 * interrupt call our clk_it handler << 1093 */ << 1094 asm volatile ("sti\n"); << 1095 << 1096 /* << 1097 * Print hello world using coroutines << 1098 */ << 1099 print_hello_world(); << 1100 << 1101 << 1102 /* << 1103 * Run coroutine tests << 1104 */ << 1105 sos_x86_videomem_printf(4, 0, << 1106 SOS_X86_VIDEO_BG_BL << 1107 "Coroutine test"); << 1108 sos_x86_videomem_printf(5, 0, << 1109 SOS_X86_VIDEO_BG_BL << 1110 "Parsing..."); << 1111 syntax_tree = parse_expression(" - ( (69/ << 1112 << 1113 if (syntax_tree != NULL) << 1114 { << 1115 sos_x86_videomem_printf(6, 0, << 1116 SOS_X86_VIDEO_B << 1117 "Evaluating..." << 1118 sos_x86_videomem_printf(7, 0, << 1119 SOS_X86_VIDEO_B << 1120 "Result=%d (if << 1121 eval_expression << 1122 << 1123 << 1124 << 1125 free_syntax_tree(syntax_tree); << 1126 sos_x86_videomem_printf(8, 0, << 1127 SOS_X86_VIDEO_B << 1128 "Done (un-alloc << 1129 } << 1130 else << 1131 { << 1132 sos_x86_videomem_printf(6, 0, << 1133 SOS_X86_VIDEO_B << 1134 "Error in parsi << 1135 } << 1136 << 1137 /* << 1138 * Run some demand-paging tests << 1139 */ << 1140 test_demand_paging(234567, 500); << 1141 << 1142 << 1143 /* << 1144 * Create an un-resolved page fault, which << 1145 * handler print the backtrace. << 1146 */ << 1147 test_backtrace(6, 0xdeadbeef, bootstrap_sta << 1148 << 1149 /* << 1150 * System should be halted BEFORE here ! << 1151 */ << 1152 << 1153 230 1154 /* An operatig system never ends */ 231 /* An operatig system never ends */ 1155 for (;;) 232 for (;;) 1156 { !! 233 continue; 1157 /* Remove this instruction if you get a << 1158 exception (old 80386 CPU) */ << 1159 asm("hlt\n"); << 1160 234 1161 continue; !! 235 return; 1162 } << 1163 } 236 }
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