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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> 029 #include <hwcore/paging.h> 030 #include <sos/list.h> !! 030 #include <sos/kmem_vmm.h> >> 031 #include <sos/kmalloc.h> 031 #include <sos/klibc.h> 032 #include <sos/klibc.h> 032 #include <sos/assert.h> 033 #include <sos/assert.h> 033 #include <drivers/x86_videomem.h> 034 #include <drivers/x86_videomem.h> 034 #include <drivers/bochs.h> 035 #include <drivers/bochs.h> 035 036 036 037 037 /* Helper function to display each bits of a 3 038 /* Helper function to display each bits of a 32bits integer on the 038 screen as dark or light carrets */ 039 screen as dark or light carrets */ 039 static void display_bits(unsigned char row, un !! 040 void display_bits(unsigned char row, unsigned char col, 040 unsigned char attribu !! 041 unsigned char attribute, 041 sos_ui32_t integer) !! 042 sos_ui32_t integer) 042 { 043 { 043 int i; 044 int i; 044 /* Scan each bit of the integer, MSb first * 045 /* Scan each bit of the integer, MSb first */ 045 for (i = 31 ; i >= 0 ; i--) 046 for (i = 31 ; i >= 0 ; i--) 046 { 047 { 047 /* Test if bit i of 'integer' is set */ 048 /* Test if bit i of 'integer' is set */ 048 int bit_i = (integer & (1 << i)); 049 int bit_i = (integer & (1 << i)); 049 /* Ascii 219 => dark carret, Ascii 177 = 050 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 050 unsigned char ascii_code = bit_i?219:177 051 unsigned char ascii_code = bit_i?219:177; 051 sos_x86_videomem_putchar(row, col++, 052 sos_x86_videomem_putchar(row, col++, 052 attribute, 053 attribute, 053 ascii_code); 054 ascii_code); 054 } 055 } 055 } 056 } 056 057 057 058 058 /* Clock IRQ handler */ 059 /* Clock IRQ handler */ 059 static void clk_it(int intid) !! 060 static void clk_it(int intid, >> 061 const struct sos_cpu_kstate *cpu_kstate) 060 { 062 { 061 static sos_ui32_t clock_count = 0; 063 static sos_ui32_t clock_count = 0; 062 064 063 display_bits(0, 48, 065 display_bits(0, 48, 064 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 066 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 065 clock_count); 067 clock_count); 066 clock_count++; 068 clock_count++; >> 069 } >> 070 >> 071 >> 072 /* ====================================================================== >> 073 * Page fault exception handling >> 074 */ >> 075 >> 076 /* Helper function to dump a backtrace on bochs and/or the console */ >> 077 static void dump_backtrace(const struct sos_cpu_kstate *cpu_kstate, >> 078 sos_vaddr_t stack_bottom, >> 079 sos_size_t stack_size, >> 080 sos_bool_t on_console, >> 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, *arg2, *arg3, *arg4; >> 089 >> 090 /* Get the address of the first 3 arguments from the >> 091 frame. Among these arguments, 0, 1, 2, 3 arguments might be >> 092 meaningful (depending on how many arguments the function may >> 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 arguments fit inside the >> 100 stack boundaries */ >> 101 #define INTERVAL_OK(b,v,u) ( ((b) <= (sos_vaddr_t)(v)) \ >> 102 && ((sos_vaddr_t)(v) < (u)) ) >> 103 if (!INTERVAL_OK(stack_bottom, arg1, stack_bottom + stack_size)) >> 104 arg1 = &invalid; >> 105 if (!INTERVAL_OK(stack_bottom, arg2, stack_bottom + stack_size)) >> 106 arg2 = &invalid; >> 107 if (!INTERVAL_OK(stack_bottom, arg3, stack_bottom + stack_size)) >> 108 arg3 = &invalid; >> 109 if (!INTERVAL_OK(stack_bottom, arg4, stack_bottom + stack_size)) >> 110 arg4 = &invalid; >> 111 >> 112 /* Print the function context for this frame */ >> 113 if (on_bochs) >> 114 sos_bochs_printf("[%d] PC=0x%x arg1=0x%x arg2=0x%x arg3=0x%x\n", >> 115 (unsigned)depth, (unsigned)PC, >> 116 (unsigned)*arg1, (unsigned)*arg2, >> 117 (unsigned)*arg3); >> 118 >> 119 if (on_console) >> 120 sos_x86_videomem_printf(23-depth, 3, >> 121 SOS_X86_VIDEO_BG_BLUE >> 122 | SOS_X86_VIDEO_FG_LTGREEN, >> 123 "[%d] PC=0x%x arg1=0x%x arg2=0x%x arg3=0x%x arg4=0x%x", >> 124 (unsigned)depth, PC, >> 125 (unsigned)*arg1, (unsigned)*arg2, >> 126 (unsigned)*arg3, (unsigned)*arg4); >> 127 >> 128 } 067 129 >> 130 sos_backtrace(cpu_kstate, 15, stack_bottom, stack_size, backtracer, NULL); 068 } 131 } 069 132 070 /* Page fault exception handler */ !! 133 071 static void pgflt_ex(int exid) !! 134 /* Page fault exception handler with demand paging for the kernel */ >> 135 static void pgflt_ex(int intid, const struct sos_cpu_kstate *ctxt) 072 { 136 { 073 sos_bochs_printf("Got page fault\n"); !! 137 static sos_ui32_t demand_paging_count = 0; 074 sos_x86_videomem_printf(10, 30, !! 138 sos_vaddr_t faulting_vaddr = sos_cpu_kstate_get_EX_faulting_vaddr(ctxt); 075 SOS_X86_VIDEO_FG_LTR !! 139 sos_paddr_t ppage_paddr; 076 "Got EXPECTED (?) Pa !! 140 077 for (;;) ; !! 141 /* Check if address is covered by any VMM range */ >> 142 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) >> 143 { >> 144 /* No: The page fault is out of any kernel virtual region. For >> 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 Fault on access to address 0x%x (info=%x)!", >> 151 (unsigned)faulting_vaddr, >> 152 (unsigned)sos_cpu_kstate_get_EX_info(ctxt)); >> 153 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); >> 154 } >> 155 >> 156 >> 157 /* >> 158 * Demand paging >> 159 */ >> 160 >> 161 /* Update the number of demand paging requests handled */ >> 162 demand_paging_count ++; >> 163 display_bits(0, 0, >> 164 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, >> 165 demand_paging_count); >> 166 >> 167 /* Allocate a new page for the virtual address */ >> 168 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); >> 169 if (! ppage_paddr) >> 170 SOS_ASSERT_FATAL(! "TODO: implement swap. (Out of mem in demand paging because no swap for kernel yet !)"); >> 171 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, >> 172 SOS_PAGE_ALIGN_INF(faulting_vaddr), >> 173 FALSE, >> 174 SOS_VM_MAP_PROT_READ >> 175 | SOS_VM_MAP_PROT_WRITE >> 176 | SOS_VM_MAP_ATOMIC)); >> 177 sos_physmem_unref_physpage(ppage_paddr); >> 178 >> 179 /* Ok, we can now return to interrupted context */ 078 } 180 } 079 181 080 static void test_paging(sos_vaddr_t sos_kernel !! 182 >> 183 >> 184 /* ====================================================================== >> 185 * Demonstrate the use of the CPU kernet context management API: >> 186 * - A coroutine prints "Hlowrd" and switches to the other after each >> 187 * letter >> 188 * - A coroutine prints "el ol\n" and switches back to the other after >> 189 * each letter. >> 190 * The first to reach the '\n' returns back to main. >> 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_vaddr) 081 { 198 { 082 /* The (linear) address of the page holding !! 199 sos_kfree(stack_vaddr); 083 currently executing */ !! 200 } 084 sos_vaddr_t vpage_code = SOS_PAGE_ALIGN_INF( << 085 201 086 /* The new physical page that will hold the << 087 sos_paddr_t ppage_new; << 088 202 089 /* Where this page will be mapped temporaril !! 203 static void exit_hello12(sos_vaddr_t stack_vaddr) 090 code into it: right after the kernel code !! 204 { 091 sos_vaddr_t vpage_tmp = sos_kernel_core_top_ !! 205 sos_cpu_kstate_exit_to(ctxt_main, >> 206 (sos_cpu_kstate_function_arg1_t*) reclaim_stack, >> 207 stack_vaddr); >> 208 } 092 209 093 unsigned i; << 094 210 095 /* Bind the page fault exception to one of o !! 211 static void hello1 (char *str) 096 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA !! 212 { 097 pgflt_ex); !! 213 for ( ; *str != '\n' ; str++) >> 214 { >> 215 sos_bochs_printf("hello1: %c\n", *str); >> 216 sos_cpu_kstate_switch(& ctxt_hello1, ctxt_hello2); >> 217 } >> 218 >> 219 /* You can uncomment this in case you explicitly want to exit >> 220 now. But returning from the function will do the same */ >> 221 /* sos_cpu_kstate_exit_to(ctxt_main, >> 222 (sos_cpu_kstate_function_arg1_t*) reclaim_stack, >> 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, ctxt_hello1); >> 233 } >> 234 >> 235 /* You can uncomment this in case you explicitly want to exit >> 236 now. But returning from the function will do the same */ >> 237 /* sos_cpu_kstate_exit_to(ctxt_main, >> 238 (sos_cpu_kstate_function_arg1_t*) reclaim_stack, >> 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, 0); >> 248 hello2_stack = sos_kmalloc(DEMO_STACK_SIZE, 0); >> 249 >> 250 /* Initialize the coroutines' contexts */ >> 251 sos_cpu_kstate_init(&ctxt_hello1, >> 252 (sos_cpu_kstate_function_arg1_t*) hello1, >> 253 (sos_ui32_t) "Hlowrd", >> 254 (sos_vaddr_t) hello1_stack, DEMO_STACK_SIZE, >> 255 (sos_cpu_kstate_function_arg1_t*) exit_hello12, >> 256 (sos_ui32_t) hello1_stack); >> 257 sos_cpu_kstate_init(&ctxt_hello2, >> 258 (sos_cpu_kstate_function_arg1_t*) hello2, >> 259 (sos_ui32_t) "el ol\n", >> 260 (sos_vaddr_t) hello2_stack, DEMO_STACK_SIZE, >> 261 (sos_cpu_kstate_function_arg1_t*) exit_hello12, >> 262 (sos_ui32_t) hello2_stack); >> 263 >> 264 /* Go to first coroutine */ >> 265 sos_bochs_printf("Printing Hello World\\n...\n"); >> 266 sos_cpu_kstate_switch(& ctxt_main, ctxt_hello1); >> 267 >> 268 /* The first coroutine to reach the '\n' switched back to us */ >> 269 sos_bochs_printf("Back in main !\n"); >> 270 } >> 271 >> 272 >> 273 /* ====================================================================== >> 274 * Generate page faults on an unmapped but allocated kernel virtual >> 275 * region, which results in a series of physical memory mappings for the >> 276 * faulted pages. >> 277 */ >> 278 static void test_demand_paging(int nb_alloc_vpages, int nb_alloc_ppages) >> 279 { >> 280 int i; >> 281 sos_vaddr_t base_vaddr; >> 282 >> 283 sos_x86_videomem_printf(10, 0, >> 284 SOS_X86_VIDEO_BG_BLUE | SOS_X86_VIDEO_FG_LTGREEN, >> 285 "Demand paging test (alloc %dMB of VMM, test %dkB RAM)", >> 286 nb_alloc_vpages >> 8, nb_alloc_ppages << 2); >> 287 >> 288 /* Allocate virtual memory */ >> 289 base_vaddr = sos_kmem_vmm_alloc(nb_alloc_vpages, 0); >> 290 >> 291 SOS_ASSERT_FATAL(base_vaddr != (sos_vaddr_t)NULL); >> 292 sos_x86_videomem_printf(11, 0, >> 293 SOS_X86_VIDEO_BG_BLUE | SOS_X86_VIDEO_FG_YELLOW, >> 294 "Allocated virtual region [0x%x, 0x%x[", >> 295 base_vaddr, >> 296 base_vaddr + nb_alloc_vpages*SOS_PAGE_SIZE); >> 297 >> 298 /* Now use part of it in physical memory */ >> 299 for (i = 0 ; (i < nb_alloc_ppages) && (i < nb_alloc_vpages) ; i++) >> 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_PAGE_SIZE; >> 305 vaddr += 2345; >> 306 >> 307 sos_x86_videomem_printf(12, 0, >> 308 SOS_X86_VIDEO_BG_BLUE | SOS_X86_VIDEO_FG_YELLOW, >> 309 "Writing %d at virtual address 0x%x...", >> 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 been allocated for us */ >> 317 sos_x86_videomem_printf(13, 0, >> 318 SOS_X86_VIDEO_BG_BLUE | SOS_X86_VIDEO_FG_YELLOW, >> 319 "Value read at address 0x%x = %d", >> 320 vaddr, (unsigned)*value); >> 321 } >> 322 >> 323 SOS_ASSERT_FATAL(SOS_OK == sos_kmem_vmm_free(base_vaddr)); >> 324 /* Yep ! A new page should normally have been allocated for us */ >> 325 sos_x86_videomem_printf(14, 0, >> 326 SOS_X86_VIDEO_BG_BLUE | SOS_X86_VIDEO_FG_YELLOW, >> 327 "Done (area un-allocated)"); >> 328 } >> 329 >> 330 >> 331 >> 332 /* ====================================================================== >> 333 * Shows how the backtrace stuff works >> 334 */ >> 335 >> 336 /* Recursive function. Print the backtrace from the innermost function */ >> 337 static void test_backtrace(int i, int magic, sos_vaddr_t stack_bottom, >> 338 sos_size_t stack_size) >> 339 { >> 340 if (i <= 0) >> 341 { >> 342 /* The page fault exception handler will print the backtrace of >> 343 this function, because address 0x42 is not mapped */ >> 344 *((char*)0x42) = 12; >> 345 >> 346 /* More direct variant: */ >> 347 /* dump_backtrace(NULL, stack_bottom, stack_size, TRUE, TRUE); */ >> 348 } >> 349 else >> 350 test_backtrace(i-1, magic, stack_bottom, stack_size); >> 351 } >> 352 >> 353 >> 354 /* ====================================================================== >> 355 * Parsing of Mathematical expressions >> 356 * >> 357 * This is a recursive lexer/parser/evaluator for arithmetical >> 358 * expressions. Supports both binary +/-* and unary +- operators, as >> 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 Expr_lr | Nothing >> 370 * Term ::= Factor Term_lr >> 371 * Term_lr ::= * Factor Term_lr | / Factor Term_lr | Nothing >> 372 * Factor ::= - Factor | + Factor | Scalar | ( Expression ) >> 373 * Scalar ::= Number | Variable >> 374 * >> 375 * Note. This is the left-recursive equivalent of the following basic grammar: >> 376 * Expression ::= Expression + Term | Expression - Term >> 377 * Term ::= Term * Factor | Term / Factor >> 378 * factor ::= - Factor | + Factor | Scalar | Variable | ( Expression ) >> 379 * Scalar ::= Number | Variable >> 380 * >> 381 * The parsing is composed of a 3 stages pipeline: >> 382 * - The reader: reads a string 1 character at a time, transferring >> 383 * the control back to lexer after each char. This function shows the >> 384 * interest in using coroutines, because its state (str) is >> 385 * implicitely stored in the stack between each iteration. >> 386 * - The lexer: consumes the characters from the reader and identifies >> 387 * the terminal tokens, 1 token at a time, transferring control back >> 388 * to the parser after each token. This function shows the interest >> 389 * in using coroutines, because its state (c and got_what_before) is >> 390 * implicitely stored in the stack between each iteration. >> 391 * - The parser: consumes the tokens from the lexer and builds the >> 392 * syntax tree of the expression. There is no real algorithmic >> 393 * interest in defining a coroutine devoted to do this. HOWEVER, we >> 394 * do use one for that because this allows us to switch to a much >> 395 * deeper stack. Actually, the parser is highly recursive, so that >> 396 * the default 16kB stack of the sos_main() function might not be >> 397 * enough. Here, we switch to a 64kB stack, which is safer for >> 398 * recursive functions. The Parser uses intermediary functions: these >> 399 * are defined and implemented as internal nested functions. This is >> 400 * just for the sake of clarity, and is absolutely not mandatory for >> 401 * the algorithm: one can transfer these functions out of the parser >> 402 * function without restriction. >> 403 * >> 404 * The evaluator is another recursive function that reuses the >> 405 * parser's stack to evaluate the parsed expression with the given >> 406 * values for the variables present in the expression. As for the >> 407 * parser function, this function defines and uses a nested function, >> 408 * which can be extracted from the main evaluation function at will. >> 409 * >> 410 * All these functions support a kind of "exception" feature: when >> 411 * something goes wrong, control is transferred DIRECTLY back to the >> 412 * sos_main() context, without unrolling the recursions. This shows >> 413 * how exceptions basically work, but one should not consider this as >> 414 * a reference exceptions implementation. Real exception mechanisms >> 415 * (such as that in the C++ language) call the destructors to the >> 416 * objects allocated on the stack during the "stack unwinding" process >> 417 * upon exception handling, which complicates a lot the mechanism. We >> 418 * don't have real Objects here (in the OOP sense, full-featured with >> 419 * destructors), so we don't have to complicate things. >> 420 * >> 421 * After this little coroutine demo, one should forget all about such >> 422 * a low-level manual direct manipulation of stacks. This would >> 423 * probably mess up the whole kernel to do what we do here (locked >> 424 * resources such as mutex/semaphore won't be correctly unlocked, >> 425 * ...). Higher level "kernel thread" primitives will soon be >> 426 * presented, which provide a higher-level set of APIs to manage CPU >> 427 * contexts. You'll have to use EXCLUSIVELY those APIs. If you still >> 428 * need a huge stack to do recursion for example, please don't even >> 429 * think of changing manually the stack for something bigger ! Simply >> 430 * rethink your algorithm, making it non-recursive. >> 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 parser and the evaluator */ >> 438 >> 439 /* The CPU states for the various coroutines */ >> 440 static struct sos_cpu_kstate *st_reader, *st_lexer, *st_parser, >> 441 *st_eval, *st_free, *st_main; >> 442 >> 443 >> 444 /* >> 445 * Default exit/reclaim functions: return control to the "sos_main()" >> 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_kstate_function_arg1_t*)reclaim, 0); >> 454 } >> 455 >> 456 >> 457 /* >> 458 * The reader coroutine and associated variable. This coroutine could >> 459 * have been a normal function, except that the current parsed >> 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_lexer); >> 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/variables. This coroutine >> 479 * could have been a normal function, except that the current parsed >> 480 * character, token and previous token would have to be stored >> 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_VAR, >> 487 LEX_IS_OPENPAR, LEX_IS_CLOSEPAR, LEX_END } type; >> 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, got_what_before; >> 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_reader); >> 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 == '*') || (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 is ended */ >> 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 if the previous token >> 531 has been recognized */ >> 532 if ( (got_what_before != GOT_SPACE) ) >> 533 sos_cpu_kstate_switch(& st_lexer, st_parser); >> 534 >> 535 data_lexer_to_parser.number = 0; >> 536 } >> 537 >> 538 /* Update the token being currently recognized */ >> 539 if (got_what == GOT_OP) >> 540 { >> 541 data_lexer_to_parser.type = LEX_IS_OPER; >> 542 data_lexer_to_parser.operator = c; >> 543 } >> 544 else if (got_what == GOT_NUM) >> 545 { >> 546 data_lexer_to_parser.type = LEX_IS_NUMBER; >> 547 data_lexer_to_parser.number *= 10; >> 548 data_lexer_to_parser.number += (c - '0'); >> 549 } >> 550 else if (got_what == GOT_STR) >> 551 { >> 552 char to_cat[] = { c, '\0' }; >> 553 data_lexer_to_parser.type = LEX_IS_VAR; >> 554 strzcat(data_lexer_to_parser.var, to_cat, STR_VAR_MAXLEN); >> 555 } >> 556 else if (got_what == GOT_OPENPAR) >> 557 data_lexer_to_parser.type = LEX_IS_OPENPAR; >> 558 else if (got_what == GOT_CLOSEPAR) >> 559 data_lexer_to_parser.type = LEX_IS_CLOSEPAR; >> 560 >> 561 got_what_before = got_what; >> 562 } >> 563 while (c != '\0'); >> 564 >> 565 /* Transfer last recognized token to the parser */ >> 566 if ( (got_what_before != GOT_SPACE) ) >> 567 sos_cpu_kstate_switch(& st_lexer, st_parser); >> 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 having received the last >> 574 one */ >> 575 sos_bochs_printf("Error: end of string already reached !\n"); >> 576 sos_cpu_kstate_switch(& st_lexer, st_main); >> 577 } >> 578 >> 579 >> 580 /* >> 581 * The Parser coroutine and associated types/variables >> 582 */ >> 583 struct syntax_node >> 584 { >> 585 enum { YY_IS_BINOP, YY_IS_UNAROP, YY_IS_NUM, YY_IS_VAR } type; >> 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_right; >> 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 ** syntax_tree) >> 604 { >> 605 static struct syntax_node *alloc_node_num(int val); >> 606 static struct syntax_node *alloc_node_var(const char * name); >> 607 static struct syntax_node *alloc_node_binop(char op, >> 608 struct syntax_node *parm_left, >> 609 struct syntax_node *parm_right); >> 610 static struct syntax_node *alloc_node_unarop(char op, >> 611 struct syntax_node *parm); >> 612 static struct syntax_node * get_expr(); >> 613 static struct syntax_node * get_expr_lr(struct syntax_node *n); >> 614 static struct syntax_node * get_term(); >> 615 static struct syntax_node * get_term_lr(struct syntax_node *n); >> 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(int val) >> 621 { >> 622 struct syntax_node *n >> 623 = (struct syntax_node*) sos_kmalloc(sizeof(struct syntax_node), 0); >> 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(const char * name) >> 630 { >> 631 struct syntax_node *n >> 632 = (struct syntax_node*) sos_kmalloc(sizeof(struct syntax_node), 0); >> 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 operator */ >> 638 static struct syntax_node *alloc_node_binop(char op, >> 639 struct syntax_node *parm_left, >> 640 struct syntax_node *parm_right) >> 641 { >> 642 struct syntax_node *n >> 643 = (struct syntax_node*) sos_kmalloc(sizeof(struct syntax_node), 0); >> 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 operator */ >> 651 static struct syntax_node *alloc_node_unarop(char op, >> 652 struct syntax_node *parm) >> 653 { >> 654 struct syntax_node *n >> 655 = (struct syntax_node*) sos_kmalloc(sizeof(struct syntax_node), 0); >> 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 to main context, >> 663 without unrolling the whole recursion */ >> 664 static void parser_exception(const char *str) >> 665 { >> 666 sos_bochs_printf("Parser exception: %s\n", str); >> 667 sos_cpu_kstate_switch(& st_parser, st_main); >> 668 } >> 669 >> 670 /* Consume the current terminal "number" token and ask for a new >> 671 token */ >> 672 static int get_number() >> 673 { >> 674 int v; >> 675 if (data_lexer_to_parser.type != LEX_IS_NUMBER) >> 676 parser_exception("Expected number"); >> 677 v = data_lexer_to_parser.number; >> 678 sos_cpu_kstate_switch(& st_parser, st_lexer); >> 679 return v; >> 680 } >> 681 /* Consume the current terminal "variable" token and ask for a new >> 682 token */ >> 683 static void get_str(char name[STR_VAR_MAXLEN]) >> 684 { >> 685 if (data_lexer_to_parser.type != LEX_IS_VAR) >> 686 parser_exception("Expected variable"); >> 687 strzcpy(name, data_lexer_to_parser.var, STR_VAR_MAXLEN); >> 688 sos_cpu_kstate_switch(& st_parser, st_lexer); >> 689 } >> 690 /* Consume the current terminal "operator" token and ask for a new >> 691 token */ >> 692 static char get_op() >> 693 { >> 694 char op; >> 695 if (data_lexer_to_parser.type != LEX_IS_OPER) >> 696 parser_exception("Expected operator"); >> 697 op = data_lexer_to_parser.operator; >> 698 sos_cpu_kstate_switch(& st_parser, st_lexer); >> 699 return op; >> 700 } >> 701 /* Consume the current terminal "parenthese" token and ask for a new >> 702 token */ >> 703 static void get_par() >> 704 { >> 705 if ( (data_lexer_to_parser.type != LEX_IS_OPENPAR) >> 706 && (data_lexer_to_parser.type != LEX_IS_CLOSEPAR) ) >> 707 parser_exception("Expected parenthese"); >> 708 sos_cpu_kstate_switch(& st_parser, st_lexer); >> 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(struct syntax_node *n) >> 719 { >> 720 if ( (data_lexer_to_parser.type == LEX_IS_OPER) >> 721 && ( (data_lexer_to_parser.operator == '+') >> 722 || (data_lexer_to_parser.operator == '-') ) ) >> 723 { >> 724 char op = get_op(); >> 725 struct syntax_node *term = get_term(); >> 726 struct syntax_node *node_op = alloc_node_binop(op, n, term); >> 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(struct syntax_node *n) >> 739 { >> 740 if ( (data_lexer_to_parser.type == LEX_IS_OPER) >> 741 && ( (data_lexer_to_parser.operator == '*') >> 742 || (data_lexer_to_parser.operator == '/') ) ) >> 743 { >> 744 char op = get_op(); >> 745 struct syntax_node *factor = get_factor(); >> 746 struct syntax_node *node_op = alloc_node_binop(op, n, factor); >> 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_IS_OPER) >> 755 && ( (data_lexer_to_parser.operator == '-') >> 756 || (data_lexer_to_parser.operator == '+') ) ) >> 757 { char op = data_lexer_to_parser.operator; >> 758 get_op(); return alloc_node_unarop(op, get_factor()); } >> 759 else if (data_lexer_to_parser.type == LEX_IS_OPENPAR) >> 760 { >> 761 struct syntax_node *expr; >> 762 get_par(); >> 763 expr = get_expr(); >> 764 if (data_lexer_to_parser.type != LEX_IS_CLOSEPAR) >> 765 parser_exception("Mismatched parentheses"); >> 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_NUMBER) >> 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 } >> 783 098 784 099 /* 785 /* 100 * Test 1: move the page where we execute th !! 786 * Body of the function 101 * physical memory << 102 */ 787 */ 103 sos_x86_videomem_printf(4, 0, << 104 SOS_X86_VIDEO_FG_LTG << 105 "Moving current code << 106 788 >> 789 /* Get the first token */ >> 790 sos_cpu_kstate_switch(& st_parser, st_lexer); 107 791 108 /* Allocate a new physical page */ !! 792 /* Begin the parsing ! */ 109 ppage_new = sos_physmem_ref_physpage_new(FAL !! 793 *syntax_tree = get_expr(); 110 if (! ppage_new) !! 794 /* The result is returned in the syntax_tree parameter */ >> 795 } >> 796 >> 797 >> 798 /* >> 799 * Setup the parser's pipeline >> 800 */ >> 801 static struct syntax_node * parse_expression(const char *expr) >> 802 { >> 803 struct syntax_node *retval = NULL; >> 804 >> 805 /* Build the context of the functions in the pipeline */ >> 806 sos_cpu_kstate_init(& st_reader, >> 807 (sos_cpu_kstate_function_arg1_t*)func_reader, >> 808 (sos_ui32_t)expr, >> 809 (sos_vaddr_t)stack_reader, sizeof(stack_reader), >> 810 (sos_cpu_kstate_function_arg1_t*)func_exit, 0); >> 811 sos_cpu_kstate_init(& st_lexer, >> 812 (sos_cpu_kstate_function_arg1_t*)func_lexer, >> 813 0, >> 814 (sos_vaddr_t)stack_lexer, sizeof(stack_lexer), >> 815 (sos_cpu_kstate_function_arg1_t*)func_exit, 0); >> 816 sos_cpu_kstate_init(& st_parser, >> 817 (sos_cpu_kstate_function_arg1_t*)func_parser, >> 818 (sos_ui32_t) /* syntax tree ! */&retval, >> 819 (sos_vaddr_t)deep_stack, sizeof(deep_stack), >> 820 (sos_cpu_kstate_function_arg1_t*)func_exit, 0); >> 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 types/variables >> 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 *parms) >> 842 { >> 843 /* The internal (recursive) nested function to evaluate each node of >> 844 the syntax tree */ >> 845 static int rec_eval(const struct syntax_node *n, >> 846 const char* var_name[], int var_val[], int nb_vars) 111 { 847 { 112 /* STOP ! No memory left */ !! 848 switch (n->type) 113 sos_x86_videomem_putstring(20, 0, !! 849 { 114 SOS_X86_VIDEO !! 850 case YY_IS_NUM: 115 | SOS_X86_V !! 851 return n->number; 116 "test_paging !! 852 117 return; !! 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->var)) >> 858 return var_val[i]; >> 859 >> 860 /* Exception: no variable with that name ! */ >> 861 sos_bochs_printf("ERROR: unknown variable %s\n", n->var); >> 862 sos_cpu_kstate_switch(& st_eval, st_main); >> 863 } >> 864 >> 865 case YY_IS_BINOP: >> 866 { >> 867 int left = rec_eval(n->binop.parm_left, >> 868 var_name, var_val, nb_vars); >> 869 int right = rec_eval(n->binop.parm_right, >> 870 var_name, var_val, nb_vars); >> 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 (INTERNAL error) ! */ >> 879 sos_bochs_printf("ERROR: unknown binop %c\n", n->binop.op); >> 880 sos_cpu_kstate_switch(& st_eval, st_main); >> 881 } >> 882 } >> 883 >> 884 case YY_IS_UNAROP: >> 885 { >> 886 int arg = rec_eval(n->unarop.parm, var_name, var_val, nb_vars); >> 887 switch (n->unarop.op) >> 888 { >> 889 case '-': return -arg; >> 890 case '+': return arg; >> 891 default: >> 892 /* Exception: no such operator (INTERNAL error) ! */ >> 893 sos_bochs_printf("ERROR: unknown unarop %c\n", n->unarop.op); >> 894 sos_cpu_kstate_switch(& st_eval, st_main); >> 895 } >> 896 } >> 897 } >> 898 >> 899 /* Exception: no such syntax node (INTERNAL error) ! */ >> 900 sos_bochs_printf("ERROR: invalid node type\n"); >> 901 sos_cpu_kstate_switch(& st_eval, st_main); >> 902 return -1; /* let's make gcc happy */ 118 } 903 } 119 904 120 sos_x86_videomem_printf(5, 0, !! 905 121 SOS_X86_VIDEO_FG_YEL !! 906 /* 122 "Hello from the addr !! 907 * Function BODY 123 sos_paging_get_paddr !! 908 */ 124 !! 909 /* Update p.result returned back to calling function */ 125 sos_x86_videomem_printf(6, 0, !! 910 parms->result 126 SOS_X86_VIDEO_FG_YEL !! 911 = rec_eval(parms->e, parms->var_name, parms->var_val, parms->nb_vars); 127 "Transfer vpage 0x%x !! 912 } 128 vpage_code, !! 913 129 sos_paging_get_paddr !! 914 /* 130 ppage_new, !! 915 * Change the stack for something larger in order to call the 131 (unsigned)vpage_tmp) !! 916 * recursive function above in a safe way 132 !! 917 */ 133 /* Map the page somewhere (right after the k !! 918 static int eval_expression(const struct syntax_node *e, 134 to copy the code we are currently executi !! 919 const char* var_name[], int var_val[], int nb_vars) 135 sos_paging_map(ppage_new, vpage_tmp, !! 920 { 136 FALSE, !! 921 struct func_eval_params p 137 SOS_VM_MAP_ATOMIC !! 922 = (struct func_eval_params){ .e=e, 138 | SOS_VM_MAP_PROT_READ !! 923 .var_name=var_name, 139 | SOS_VM_MAP_PROT_WRITE); !! 924 .var_val=var_val, 140 !! 925 .nb_vars=nb_vars, 141 /* Ok, the new page is referenced by the map !! 926 .result = 0 }; 142 reference to it */ !! 927 143 sos_physmem_unref_physpage(ppage_new); !! 928 sos_cpu_kstate_init(& st_eval, 144 !! 929 (sos_cpu_kstate_function_arg1_t*)func_eval, 145 /* Copy the contents of the current page of !! 930 (sos_ui32_t)/* p.result is modified upon success */&p, 146 mapping */ !! 931 (sos_vaddr_t)deep_stack, sizeof(deep_stack), 147 memcpy((void*)vpage_tmp, !! 932 (sos_cpu_kstate_function_arg1_t*)func_exit, 0); 148 (void*)vpage_code, !! 933 149 SOS_PAGE_SIZE); !! 934 /* Go ! */ 150 !! 935 sos_cpu_kstate_switch(& st_main, st_eval); 151 /* Transfer the mapping of the current page !! 936 return p.result; 152 sos_paging_map(ppage_new, vpage_code, !! 937 } 153 FALSE, !! 938 154 SOS_VM_MAP_ATOMIC !! 939 155 | SOS_VM_MAP_PROT_READ !! 940 /* 156 | SOS_VM_MAP_PROT_WRITE); !! 941 * Function to free the syntax tree >> 942 */ >> 943 static void func_free(struct syntax_node *n) >> 944 { >> 945 switch (n->type) >> 946 { >> 947 case YY_IS_NUM: >> 948 case YY_IS_VAR: >> 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 >> 956 case YY_IS_UNAROP: >> 957 func_free(n->unarop.parm); >> 958 break; >> 959 } 157 960 158 /* Ok, here we are: we have changed the phys !! 961 sos_kfree((sos_vaddr_t)n); 159 code we are executing ;). However, this n << 160 virtual addresses: << 161 - vpage_tmp << 162 - vpage_code << 163 We can safely unmap it from sos_kernel_co << 164 still keeping the vpage_code mapping */ << 165 sos_paging_unmap(vpage_tmp); << 166 << 167 sos_x86_videomem_printf(7, 0, << 168 SOS_X86_VIDEO_FG_YEL << 169 "Hello from the addr << 170 sos_paging_get_paddr << 171 << 172 sos_x86_videomem_printf(9, 0, << 173 SOS_X86_VIDEO_FG_LTG << 174 "Provoking a page fa << 175 << 176 /* << 177 * Test 2: make sure the #PF handler works << 178 */ << 179 << 180 /* Scan part of the kernel up to a page faul << 181 should occur on the first page unmapped a << 182 which is exactly the page we temporarily << 183 (vpage_tmp) above to move the kernel code << 184 for (i = vpage_code ; /* none */ ; i += SOS_ << 185 { << 186 unsigned *pint = (unsigned *)SOS_PAGE_AL << 187 sos_bochs_printf("Test vaddr 0x%x : val= << 188 sos_x86_videomem_printf(10, 0, << 189 SOS_X86_VIDEO_FG << 190 "Test vaddr 0x%x << 191 (unsigned)pint); << 192 sos_bochs_printf("0x%x\n", *pint); << 193 sos_x86_videomem_printf(10, 30, << 194 SOS_X86_VIDEO_FG << 195 "0x%x " << 196 } << 197 << 198 /* BAD ! Did not get the page fault... */ << 199 sos_x86_videomem_printf(20, 0, << 200 SOS_X86_VIDEO_FG_LTR << 201 "We should have had << 202 vpage_tmp); << 203 } 962 } 204 963 205 /* The C entry point of our operating system * !! 964 /* >> 965 * Change the stack for something larger in order to call the >> 966 * recursive function above in a safe way >> 967 */ >> 968 static void free_syntax_tree(struct syntax_node *tree) >> 969 { >> 970 sos_cpu_kstate_init(& st_free, >> 971 (sos_cpu_kstate_function_arg1_t*)func_free, >> 972 (sos_ui32_t)tree, >> 973 (sos_vaddr_t)deep_stack, sizeof(deep_stack), >> 974 (sos_cpu_kstate_function_arg1_t*)func_exit, 0); >> 975 >> 976 /* Go ! */ >> 977 sos_cpu_kstate_switch(& st_main, st_free); >> 978 } >> 979 >> 980 >> 981 /* ====================================================================== >> 982 * The C entry point of our operating system >> 983 */ 206 void sos_main(unsigned long magic, unsigned lo 984 void sos_main(unsigned long magic, unsigned long addr) 207 { 985 { 208 unsigned i; 986 unsigned i; 209 sos_paddr_t sos_kernel_core_base_paddr, sos_ 987 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; >> 988 struct syntax_node *syntax_tree; 210 989 211 /* Grub sends us a structure, called multibo 990 /* Grub sends us a structure, called multiboot_info_t with a lot of 212 precious informations about the system, s 991 precious informations about the system, see the multiboot 213 documentation for more information. */ 992 documentation for more information. */ 214 multiboot_info_t *mbi; 993 multiboot_info_t *mbi; 215 mbi = (multiboot_info_t *) addr; 994 mbi = (multiboot_info_t *) addr; 216 995 217 /* Setup bochs and console, and clear the co 996 /* Setup bochs and console, and clear the console */ 218 sos_bochs_setup(); 997 sos_bochs_setup(); 219 998 220 sos_x86_videomem_setup(); 999 sos_x86_videomem_setup(); 221 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 1000 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 222 1001 223 /* Greetings from SOS */ 1002 /* Greetings from SOS */ 224 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 1003 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 225 /* Loaded with Grub */ 1004 /* Loaded with Grub */ 226 sos_x86_videomem_printf(1, 0, 1005 sos_x86_videomem_printf(1, 0, 227 SOS_X86_VIDEO_FG_Y 1006 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 228 "Welcome From GRUB 1007 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 229 "SOS", ',', 1008 "SOS", ',', 230 (unsigned)(mbi->me 1009 (unsigned)(mbi->mem_upper >> 10) + 1, 231 (unsigned)mbi->mem 1010 (unsigned)mbi->mem_upper); 232 else 1011 else 233 /* Not loaded with grub */ 1012 /* Not loaded with grub */ 234 sos_x86_videomem_printf(1, 0, 1013 sos_x86_videomem_printf(1, 0, 235 SOS_X86_VIDEO_FG_Y 1014 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 236 "Welcome to SOS"); 1015 "Welcome to SOS"); 237 1016 238 sos_bochs_putstring("Message in a bochs\n"); 1017 sos_bochs_putstring("Message in a bochs\n"); 239 1018 240 /* Setup CPU segmentation and IRQ subsystem 1019 /* Setup CPU segmentation and IRQ subsystem */ 241 sos_gdt_setup(); !! 1020 sos_gdt_subsystem_setup(); 242 sos_idt_setup(); !! 1021 sos_idt_subsystem_setup(); 243 1022 244 /* Setup SOS IRQs and exceptions subsystem * 1023 /* Setup SOS IRQs and exceptions subsystem */ 245 sos_exceptions_setup(); !! 1024 sos_exception_subsystem_setup(); 246 sos_irq_setup(); !! 1025 sos_irq_subsystem_setup(); 247 1026 248 /* Configure the timer so as to raise the IR 1027 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 249 sos_i8254_set_frequency(100); 1028 sos_i8254_set_frequency(100); 250 1029 251 << 252 /* We need a multiboot-compliant boot loader 1030 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 253 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 1031 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 254 { 1032 { 255 sos_x86_videomem_putstring(20, 0, 1033 sos_x86_videomem_putstring(20, 0, 256 SOS_X86_VIDEO 1034 SOS_X86_VIDEO_FG_LTRED 257 | SOS_X86_V 1035 | SOS_X86_VIDEO_BG_BLUE 258 | SOS_X86_V 1036 | SOS_X86_VIDEO_FG_BLINKING, 259 "I'm not load 1037 "I'm not loaded with Grub !"); 260 /* STOP ! */ 1038 /* STOP ! */ 261 for (;;) 1039 for (;;) 262 continue; 1040 continue; 263 } 1041 } 264 1042 >> 1043 /* >> 1044 * Some interrupt handlers >> 1045 */ >> 1046 265 /* Binding some HW interrupts and exceptions 1047 /* Binding some HW interrupts and exceptions to software routines */ 266 sos_irq_set_routine(SOS_IRQ_TIMER, 1048 sos_irq_set_routine(SOS_IRQ_TIMER, 267 clk_it); !! 1049 clk_it); 268 /* Enabling the HW interrupts here, this wil !! 1050 269 interrupt call our clk_it handler */ !! 1051 /* 270 asm volatile ("sti\n"); !! 1052 * Setup physical memory management >> 1053 */ >> 1054 271 /* Multiboot says: "The value returned for u 1055 /* Multiboot says: "The value returned for upper memory is maximally 272 the address of the first upper memory hol 1056 the address of the first upper memory hole minus 1 megabyte.". It 273 also adds: "It is not guaranteed to be th 1057 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 274 sos_physmem_setup((mbi->mem_upper<<10) + (1< !! 1058 sos_physmem_subsystem_setup((mbi->mem_upper<<10) + (1<<20), 275 & sos_kernel_core_base_pad !! 1059 & sos_kernel_core_base_paddr, 276 & sos_kernel_core_top_padd !! 1060 & sos_kernel_core_top_paddr); 277 1061 278 /* 1062 /* 279 * Switch to paged-memory mode 1063 * Switch to paged-memory mode 280 */ 1064 */ 281 1065 282 /* Disabling interrupts should seem more cor 1066 /* Disabling interrupts should seem more correct, but it's not really 283 necessary at this stage */ 1067 necessary at this stage */ 284 if (sos_paging_setup(sos_kernel_core_base_pa !! 1068 SOS_ASSERT_FATAL(SOS_OK == 285 sos_kernel_core_top_pad !! 1069 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 286 sos_bochs_printf("Could not setup paged me !! 1070 sos_kernel_core_top_paddr)); 287 sos_x86_videomem_printf(2, 0, !! 1071 288 SOS_X86_VIDEO_FG_YEL !! 1072 /* Bind the page fault exception */ 289 "Paged-memory mode i !! 1073 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, >> 1074 pgflt_ex); >> 1075 >> 1076 /* >> 1077 * Setup kernel virtual memory allocator >> 1078 */ >> 1079 >> 1080 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, >> 1081 sos_kernel_core_top_paddr, >> 1082 bootstrap_stack_bottom, >> 1083 bootstrap_stack_bottom >> 1084 + bootstrap_stack_size)) >> 1085 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); >> 1086 >> 1087 if (sos_kmalloc_subsystem_setup()) >> 1088 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); >> 1089 >> 1090 /* >> 1091 * Enabling the HW interrupts here, this will make the timer HW >> 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_BLUE | SOS_X86_VIDEO_FG_LTGREEN, >> 1107 "Coroutine test"); >> 1108 sos_x86_videomem_printf(5, 0, >> 1109 SOS_X86_VIDEO_BG_BLUE | SOS_X86_VIDEO_FG_YELLOW, >> 1110 "Parsing..."); >> 1111 syntax_tree = parse_expression(" - ( (69/ toto)+ ( (( - +-- 1))) + --toto*((toto+ - - y - +2*(y-toto))*y) +2*(y-toto) )/- (( y - toto)*2)"); >> 1112 >> 1113 if (syntax_tree != NULL) >> 1114 { >> 1115 sos_x86_videomem_printf(6, 0, >> 1116 SOS_X86_VIDEO_BG_BLUE | SOS_X86_VIDEO_FG_YELLOW, >> 1117 "Evaluating..."); >> 1118 sos_x86_videomem_printf(7, 0, >> 1119 SOS_X86_VIDEO_BG_BLUE | SOS_X86_VIDEO_FG_YELLOW, >> 1120 "Result=%d (if 0: check bochs output)", >> 1121 eval_expression(syntax_tree, >> 1122 (const char*[]){"toto", "y"}, >> 1123 (int[]){3, 4}, >> 1124 2)); >> 1125 free_syntax_tree(syntax_tree); >> 1126 sos_x86_videomem_printf(8, 0, >> 1127 SOS_X86_VIDEO_BG_BLUE | SOS_X86_VIDEO_FG_YELLOW, >> 1128 "Done (un-allocated syntax tree)"); >> 1129 } >> 1130 else >> 1131 { >> 1132 sos_x86_videomem_printf(6, 0, >> 1133 SOS_X86_VIDEO_BG_BLUE | SOS_X86_VIDEO_FG_YELLOW, >> 1134 "Error in parsing (see bochs output)"); >> 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 will make the page fault >> 1145 * handler print the backtrace. >> 1146 */ >> 1147 test_backtrace(6, 0xdeadbeef, bootstrap_stack_bottom, bootstrap_stack_size); >> 1148 >> 1149 /* >> 1150 * System should be halted BEFORE here ! >> 1151 */ 290 1152 291 test_paging(sos_kernel_core_top_paddr); << 292 1153 293 /* An operatig system never ends */ 1154 /* An operatig system never ends */ 294 for (;;) 1155 for (;;) 295 continue; !! 1156 { >> 1157 /* Remove this instruction if you get an "Invalid opcode" CPU >> 1158 exception (old 80386 CPU) */ >> 1159 asm("hlt\n"); 296 1160 297 return; !! 1161 continue; >> 1162 } 298 } 1163 }
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