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001 /* Copyright (C) 2004 The SOS Team 001 /* Copyright (C) 2004 The SOS Team >> 002 Copyright (C) 1999 Free Software Foundation, Inc. 002 003 003 This program is free software; you can redi 004 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 005 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 006 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 007 of the License, or (at your option) any later version. 007 008 008 This program is distributed in the hope tha 009 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 010 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 012 GNU General Public License for more details. 012 013 013 You should have received a copy of the GNU 014 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 015 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 016 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 017 USA. 017 */ 018 */ 018 019 019 #include <sos/errno.h> << 020 << 021 /* Include definitions of the multiboot standa 020 /* Include definitions of the multiboot standard */ 022 #include <bootstrap/multiboot.h> 021 #include <bootstrap/multiboot.h> 023 #include <hwcore/idt.h> 022 #include <hwcore/idt.h> 024 #include <hwcore/gdt.h> 023 #include <hwcore/gdt.h> 025 #include <hwcore/irq.h> 024 #include <hwcore/irq.h> 026 #include <hwcore/exception.h> 025 #include <hwcore/exception.h> 027 #include <hwcore/i8254.h> 026 #include <hwcore/i8254.h> 028 #include <sos/list.h> << 029 #include <sos/physmem.h> << 030 #include <hwcore/paging.h> << 031 #include <hwcore/mm_context.h> << 032 #include <hwcore/swintr.h> << 033 #include <sos/kmem_vmm.h> << 034 #include <sos/kmalloc.h> << 035 #include <sos/time.h> << 036 #include <sos/thread.h> << 037 #include <sos/process.h> << 038 #include <sos/umem_vmm.h> << 039 #include <sos/klibc.h> 027 #include <sos/klibc.h> 040 #include <sos/assert.h> 028 #include <sos/assert.h> 041 #include <drivers/x86_videomem.h> 029 #include <drivers/x86_videomem.h> 042 #include <drivers/bochs.h> 030 #include <drivers/bochs.h> 043 #include <sos/calcload.h> !! 031 044 #include <sos/umem_vmm.h> << 045 #include <sos/binfmt_elf32.h> << 046 #include <drivers/zero.h> << 047 #include <sos/fs.h> << 048 #include <drivers/fs_virtfs.h> << 049 #include <drivers/devices.h> << 050 #include <drivers/mem.h> << 051 #include <drivers/tty.h> << 052 #include <drivers/console.h> << 053 #include <drivers/serial.h> << 054 #include <sos/blkdev.h> << 055 #include <sos/fs_pagecache.h> << 056 #include <drivers/ide.h> << 057 032 058 /* Helper function to display each bits of a 3 033 /* Helper function to display each bits of a 32bits integer on the 059 screen as dark or light carrets */ 034 screen as dark or light carrets */ 060 void display_bits(unsigned char row, unsigned !! 035 static void display_bits(unsigned char row, unsigned char col, 061 unsigned char attribute, !! 036 unsigned char attribute, 062 sos_ui32_t integer) !! 037 sos_ui32_t integer) 063 { 038 { 064 int i; 039 int i; 065 /* Scan each bit of the integer, MSb first * 040 /* Scan each bit of the integer, MSb first */ 066 for (i = 31 ; i >= 0 ; i--) 041 for (i = 31 ; i >= 0 ; i--) 067 { 042 { 068 /* Test if bit i of 'integer' is set */ 043 /* Test if bit i of 'integer' is set */ 069 int bit_i = (integer & (1 << i)); 044 int bit_i = (integer & (1 << i)); 070 /* Ascii 219 => dark carret, Ascii 177 = 045 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 071 unsigned char ascii_code = bit_i?219:177 046 unsigned char ascii_code = bit_i?219:177; 072 sos_x86_videomem_putchar(row, col++, 047 sos_x86_videomem_putchar(row, col++, 073 attribute, 048 attribute, 074 ascii_code); 049 ascii_code); 075 } 050 } 076 } 051 } 077 052 >> 053 078 /* Clock IRQ handler */ 054 /* Clock IRQ handler */ 079 static void clk_it(int intid) 055 static void clk_it(int intid) 080 { 056 { 081 static sos_ui32_t clock_count = 0; 057 static sos_ui32_t clock_count = 0; 082 058 083 display_bits(0, 48, 059 display_bits(0, 48, 084 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 060 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 085 clock_count); 061 clock_count); 086 clock_count++; 062 clock_count++; 087 063 088 /* Execute the expired timeout actions (if a << 089 sos_time_do_tick(); << 090 << 091 /* Update scheduler statistics and status */ << 092 sos_sched_do_timer_tick(); << 093 } 064 } 094 065 095 !! 066 /* Division by zero exception handler */ 096 /* =========================================== !! 067 static void divide_ex(int exid) 097 * Page fault exception handling << 098 */ << 099 << 100 << 101 /* Page fault exception handler with demand pa << 102 static void pgflt_ex(int intid, struct sos_cpu << 103 { 068 { 104 static sos_ui32_t demand_paging_count = 0; !! 069 static sos_ui32_t div_count = 0; 105 struct sos_thread * cur_thr = sos_thread_get << 106 sos_vaddr_t faulting_vaddr = sos_cpu_contex << 107 sos_paddr_t ppage_paddr; << 108 << 109 if (sos_cpu_context_is_in_user_mode(ctxt) << 110 || (cur_thr->fixup_uaccess.return_vaddr) << 111 { << 112 __label__ unforce_address_space; << 113 sos_bool_t need_to_setup_mmu; << 114 sos_ui32_t errcode = sos_cpu_context_get << 115 << 116 /* Make sure to always stay in the inter << 117 configuration */ << 118 need_to_setup_mmu = (cur_thr->squatted_m << 119 != sos_process_get_ << 120 if (need_to_setup_mmu) << 121 sos_thread_prepare_user_space_access(N << 122 << 123 if (SOS_OK == << 124 sos_umem_vmm_try_resolve_page_fault( << 125 << 126 << 127 goto unforce_address_space; << 128 << 129 /* If the page fault occured in kernel m << 130 the fixup address */ << 131 if (! sos_cpu_context_is_in_user_mode(ct << 132 { << 133 cur_thr->fixup_uaccess.faulted_uaddr << 134 sos_cpu_context_set_EX_return_addres << 135 << 136 goto unforce_address_space; << 137 } << 138 << 139 if (need_to_setup_mmu) << 140 sos_thread_end_user_space_access(); << 141 << 142 sos_bochs_printf("\e[35mTHR %p: Unresolv << 143 (void*)sos_thread_get_c << 144 sos_cpu_context_get_PC( << 145 (unsigned)faulting_vadd << 146 (unsigned)sos_cpu_conte << 147 sos_bochs_printf("Terminating User threa << 148 sos_thread_exit(); << 149 << 150 unforce_address_space: << 151 if (need_to_setup_mmu) << 152 sos_thread_end_user_space_access(); << 153 return; << 154 } << 155 << 156 /* Check if address is covered by any VMM ra << 157 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v << 158 { << 159 /* No: The page fault is out of any kern << 160 the moment, we don't handle this. */ << 161 sos_display_fatal_error("Unresolved page << 162 sos_cpu_context_ << 163 (unsigned)faulti << 164 (unsigned)sos_cp << 165 SOS_ASSERT_FATAL(! "Got page fault (note << 166 } << 167 << 168 << 169 /* << 170 * Demand paging in kernel space << 171 */ << 172 << 173 /* Update the number of demand paging reques << 174 demand_paging_count ++; << 175 display_bits(0, 0, 070 display_bits(0, 0, 176 SOS_X86_VIDEO_FG_LTRED | SOS_X8 071 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 177 demand_paging_count); !! 072 div_count); 178 !! 073 div_count++; 179 /* Allocate a new page for the virtual addre << 180 ppage_paddr = sos_physmem_ref_physpage_new(F << 181 if (! ppage_paddr) << 182 SOS_ASSERT_FATAL(! "TODO: implement swap. << 183 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp << 184 SO << 185 FA << 186 SO << 187 | << 188 | << 189 sos_physmem_unref_physpage(ppage_paddr); << 190 << 191 /* Ok, we can now return to interrupted cont << 192 } << 193 << 194 << 195 << 196 /* =========================================== << 197 * An operating system MUST always have a read << 198 * what would the CPU have to execute ?! << 199 */ << 200 static void idle_thread(void* unused) __attrib << 201 static void idle_thread(void* unused) << 202 { << 203 sos_ui32_t idle_twiddle = 0; << 204 << 205 while (1) << 206 { << 207 /* Remove this instruction if you get an << 208 exception (old 80386 CPU) */ << 209 asm("hlt\n"); << 210 << 211 idle_twiddle ++; << 212 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE << 213 idle_twiddle); << 214 << 215 /* Lend the CPU to some other thread */ << 216 sos_thread_yield(); << 217 } << 218 } << 219 << 220 << 221 /* =========================================== << 222 * Kernel thread showing some CPU usage statis << 223 */ << 224 #define LOAD_DISPLAY_BASELINE 4 << 225 #define LOAD_DISPLAY_STARTROW 34 << 226 static void stat_thread(void * unused) __attri << 227 static void stat_thread(void * unused) << 228 { << 229 while (1) << 230 { << 231 sos_ui32_t flags; << 232 sos_ui32_t load1, load5, load15; << 233 char str1[11], str5[11], str15[11]; << 234 struct sos_time t; << 235 t.sec = 1; << 236 t.nanosec = 0; << 237 << 238 sos_thread_sleep(& t); << 239 << 240 sos_disable_IRQs(flags); << 241 << 242 /* The IDLE task is EXcluded in the foll << 243 sos_load_get_sload(&load1, &load5, &load << 244 sos_load_to_string(str1, load1); << 245 sos_load_to_string(str5, load5); << 246 sos_load_to_string(str15, load15); << 247 sos_x86_videomem_printf(LOAD_DISPLAY_BAS << 248 SOS_X86_VIDEO_FG << 249 "Kernel (- Idle) << 250 str1, str5, str1 << 251 << 252 sos_load_get_uload(&load1, &load5, &load << 253 sos_load_to_string(str1, load1); << 254 sos_load_to_string(str5, load5); << 255 sos_load_to_string(str15, load15); << 256 sos_x86_videomem_printf(LOAD_DISPLAY_BAS << 257 SOS_X86_VIDEO_FG << 258 "User: %s %s %s << 259 str1, str5, str1 << 260 << 261 sos_load_get_uratio(&load1, &load5, &loa << 262 sos_load_to_string(str1, load1); << 263 sos_load_to_string(str5, load5); << 264 sos_load_to_string(str15, load15); << 265 sos_x86_videomem_printf(LOAD_DISPLAY_BAS << 266 SOS_X86_VIDEO_FG << 267 "User CPU %%: %s << 268 str1, str5, str1 << 269 << 270 /* The IDLE task is INcluded in the foll << 271 sos_load_get_sratio(&load1, &load5, &loa << 272 sos_load_to_string(str1, load1); << 273 sos_load_to_string(str5, load5); << 274 sos_load_to_string(str15, load15); << 275 sos_x86_videomem_printf(LOAD_DISPLAY_BAS << 276 SOS_X86_VIDEO_FG << 277 "Kernel CPU %% ( << 278 str1, str5, str1 << 279 sos_restore_IRQs(flags); << 280 } << 281 } << 282 << 283 << 284 /* =========================================== << 285 * Start the "init" (userland) process << 286 */ << 287 static sos_ret_t << 288 start_init(struct sos_fs_manager_instance * ro << 289 { << 290 sos_ret_t retval; << 291 struct sos_umem_vmm_as *as_init; << 292 struct sos_process *proc_init; << 293 struct sos_thread *new_thr; << 294 sos_uaddr_t ustack, start_uaddr; << 295 struct sos_fs_opened_file * init_root, * ini << 296 << 297 /* Create the new process */ << 298 proc_init = sos_process_create("init", FALSE << 299 if (! proc_init) << 300 return -SOS_ENOMEM; << 301 as_init = sos_process_get_address_space(proc << 302 << 303 << 304 /* << 305 * Setup the root and CWD directories of the << 306 * this process will correspond to the "glob << 307 * system since all the future processes wil << 308 */ << 309 retval = sos_fs_new_opened_file(proc_init, r << 310 SOS_FS_OPEN_ << 311 & init_root) << 312 if (SOS_OK != retval) << 313 { << 314 sos_process_unref(proc_init); << 315 return -SOS_ENOENT; << 316 } << 317 << 318 /* Duplicate the root file to set the curren << 319 the init process */ << 320 retval = sos_fs_duplicate_opened_file(init_r << 321 & init << 322 if (SOS_OK != retval) << 323 { << 324 sos_fs_close(init_root); << 325 sos_process_unref(proc_init); << 326 return -SOS_ENOENT; << 327 } << 328 << 329 /* Now update the process ! */ << 330 if ( ( SOS_OK != sos_process_chroot(proc_ini << 331 || ( SOS_OK != sos_process_chdir(proc_i << 332 { << 333 sos_fs_close(init_root); << 334 sos_fs_close(init_cwd); << 335 sos_process_chroot(proc_init, NULL, & un << 336 sos_process_chdir(proc_init, NULL, & unu << 337 sos_process_unref(proc_init); << 338 return -SOS_ENOENT; << 339 } << 340 << 341 << 342 << 343 /* Map the 'init' program in user space */ << 344 start_uaddr = sos_binfmt_elf32_map(as_init, << 345 if (0 == start_uaddr) << 346 { << 347 sos_process_unref(proc_init); << 348 return -SOS_ENOENT; << 349 } << 350 << 351 /* Allocate the user stack */ << 352 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ << 353 retval = sos_dev_zero_map(as_init, &ustack, << 354 SOS_VM_MAP_PROT_RE << 355 /* PRIVATE */ 0); << 356 if (SOS_OK != retval) << 357 { << 358 sos_process_unref(proc_init); << 359 return -SOS_ENOMEM; << 360 } << 361 << 362 /* Now create the user thread */ << 363 new_thr = sos_create_user_thread(NULL, << 364 proc_init, << 365 start_uaddr << 366 0, 0, << 367 ustack + SO << 368 SOS_SCHED_P << 369 if (! new_thr) << 370 { << 371 sos_process_unref(proc_init); << 372 return -SOS_ENOMEM; << 373 } << 374 << 375 sos_process_unref(proc_init); << 376 return SOS_OK; << 377 } 074 } 378 075 379 !! 076 /* The C entry point of our operating system */ 380 !! 077 void sos_main(unsigned long magic, unsigned long addr) 381 /* =========================================== << 382 * The C entry point of our operating system << 383 */ << 384 void sos_main(unsigned long magic, unsigned lo << 385 __attribute__((noreturn)); << 386 void sos_main(unsigned long magic, unsigned lo << 387 { 078 { 388 sos_paddr_t sos_kernel_core_base_paddr, sos_ !! 079 unsigned i; 389 struct sos_time tick_resolution; << 390 struct sos_fs_manager_instance * rootfs; << 391 080 392 /* Size of RAM above 1MB. Might be undefined !! 081 /* Grub sends us a structure, called multiboot_info_t with a lot of 393 unsigned long int upper_mem = 0; !! 082 precious informations about the system, see the multiboot >> 083 documentation for more information. */ >> 084 multiboot_info_t *mbi; >> 085 mbi = (multiboot_info_t *) addr; 394 086 395 /* Setup bochs and console, and clear the co 087 /* Setup bochs and console, and clear the console */ 396 sos_bochs_subsystem_setup(); !! 088 sos_bochs_setup(); 397 089 398 sos_x86_videomem_setup(); 090 sos_x86_videomem_setup(); 399 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 091 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 400 092 401 /* Greetings from SOS */ 093 /* Greetings from SOS */ 402 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 094 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 403 { !! 095 /* Loaded with Grub */ 404 /* Grub sends us a structure, called mul !! 096 sos_x86_videomem_printf(1, 0, 405 precious informations about the syste !! 097 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 406 documentation for more information. * !! 098 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 407 multiboot_info_t *mbi = (multiboot_info_ !! 099 "SOS", ',', 408 !! 100 (unsigned)(mbi->mem_upper >> 10) + 1, 409 /* Multiboot says: "The value returned f !! 101 (unsigned)mbi->mem_upper); 410 maximally the address of the first up << 411 megabyte.". It also adds: "It is not << 412 value." aka "YMMV" ;) */ << 413 upper_mem = mbi->mem_upper; << 414 sos_x86_videomem_printf(1, 0, << 415 SOS_X86_VIDEO_FG << 416 "Welcome From GR << 417 "SOS article 9.5 << 418 (unsigned)(upper << 419 (unsigned)upper_ << 420 } << 421 else if (magic == 0x42244224) << 422 { << 423 /* Loaded with SOS bootsect */ << 424 upper_mem = arg; << 425 sos_x86_videomem_printf(1, 0, << 426 SOS_X86_VIDEO_FG << 427 "Welcome to %s%c << 428 "SOS article 9.5 << 429 (unsigned)(upper << 430 (unsigned)upper_ << 431 } << 432 else 102 else 433 /* Not loaded with grub, not from an enhan !! 103 /* Not loaded with grub */ 434 sos_x86_videomem_printf(1, 0, 104 sos_x86_videomem_printf(1, 0, 435 SOS_X86_VIDEO_FG_Y 105 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 436 "Welcome to SOS ar !! 106 "Welcome to SOS"); 437 107 438 sos_bochs_putstring("Message in a bochs: Thi !! 108 sos_bochs_putstring("Message in a bochs\n"); 439 109 440 /* Setup CPU segmentation and IRQ subsystem 110 /* Setup CPU segmentation and IRQ subsystem */ 441 sos_gdt_subsystem_setup(); !! 111 sos_gdt_setup(); 442 sos_idt_subsystem_setup(); !! 112 sos_idt_setup(); 443 113 444 /* Setup SOS IRQs and exceptions subsystem * 114 /* Setup SOS IRQs and exceptions subsystem */ 445 sos_exception_subsystem_setup(); !! 115 sos_exceptions_setup(); 446 sos_irq_subsystem_setup(); !! 116 sos_irq_setup(); 447 117 448 /* Configure the timer so as to raise the IR 118 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 449 sos_i8254_set_frequency(100); 119 sos_i8254_set_frequency(100); 450 120 451 /* Setup the kernel time subsystem to get pr << 452 ticks into account */ << 453 tick_resolution = (struct sos_time) { .sec=0 << 454 sos_time_subsysem_setup(& tick_resolution); << 455 << 456 /* We need to know the RAM size */ << 457 if (upper_mem == 0) << 458 { << 459 sos_x86_videomem_putstring(20, 0, << 460 SOS_X86_VIDEO << 461 | SOS_X86_V << 462 | SOS_X86_V << 463 "I don't know << 464 /* STOP ! */ << 465 for (;;) << 466 continue; << 467 } << 468 << 469 /* << 470 * Some interrupt handlers << 471 */ << 472 << 473 /* Binding some HW interrupts and exceptions 121 /* Binding some HW interrupts and exceptions to software routines */ 474 sos_irq_set_routine(SOS_IRQ_TIMER, 122 sos_irq_set_routine(SOS_IRQ_TIMER, 475 clk_it); !! 123 clk_it); 476 !! 124 sos_exception_set_routine(SOS_EXCEPT_DIVIDE_ERROR, 477 /* !! 125 divide_ex); 478 * Setup physical memory management << 479 */ << 480 << 481 SOS_ASSERT_FATAL(SOS_OK << 482 == sos_physmem_subsystem_se << 483 << 484 << 485 << 486 /* << 487 * Switch to paged-memory mode << 488 */ << 489 << 490 /* Disabling interrupts should seem more cor << 491 necessary at this stage */ << 492 SOS_ASSERT_FATAL(SOS_OK == << 493 sos_paging_subsystem_setup( << 494 << 495 << 496 /* Bind the page fault exception */ << 497 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA << 498 pgflt_ex); << 499 << 500 /* << 501 * Setup kernel virtual memory allocator << 502 */ << 503 << 504 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ << 505 sos_kernel_ << 506 bootstrap_s << 507 bootstrap_s << 508 + bootstrap << 509 sos_bochs_printf("Could not setup the Kern << 510 << 511 if (sos_kmalloc_subsystem_setup()) << 512 sos_bochs_printf("Could not setup the Kmal << 513 << 514 /* << 515 * Initialize the MMU context subsystem << 516 */ << 517 sos_mm_context_subsystem_setup(); << 518 << 519 /* << 520 * Initialize the CPU context subsystem << 521 */ << 522 sos_cpu_context_subsystem_setup(); << 523 << 524 /* << 525 * Bind the syscall handler to its software << 526 */ << 527 sos_swintr_subsystem_setup(); << 528 << 529 << 530 /* << 531 * Initialize the Kernel thread and schedule << 532 */ << 533 << 534 /* Initialize kernel thread subsystem */ << 535 sos_thread_subsystem_setup(bootstrap_stack_b << 536 bootstrap_stack_s << 537 << 538 /* Initialize the scheduler */ << 539 sos_sched_subsystem_setup(); << 540 << 541 /* Declare the IDLE thread */ << 542 SOS_ASSERT_FATAL(sos_create_kernel_thread("i << 543 SO << 544 << 545 /* Prepare the stats subsystem */ << 546 sos_load_subsystem_setup(); << 547 << 548 /* Declare a thread that prints some stats * << 549 SOS_ASSERT_FATAL(sos_create_kernel_thread("s << 550 NU << 551 SO << 552 << 553 << 554 /* << 555 * Initialise user address space management << 556 */ << 557 sos_umem_vmm_subsystem_setup(); << 558 sos_dev_zero_subsystem_setup(); << 559 << 560 /* Initialize the page and block cache subsy << 561 sos_fs_pagecache_subsystem_setup(); << 562 sos_blockdev_subsystem_setup(); << 563 sos_dev_mem_chardev_setup(); << 564 << 565 /* << 566 * Initialize process stuff << 567 */ << 568 sos_process_subsystem_setup(); << 569 << 570 << 571 /* Enabling the HW interrupts here, this wil 126 /* Enabling the HW interrupts here, this will make the timer HW 572 interrupt call the scheduler */ !! 127 interrupt call our clk_it handler */ 573 asm volatile ("sti\n"); 128 asm volatile ("sti\n"); 574 129 >> 130 /* Raise a rafale of 'division by 0' exceptions. All this code is >> 131 not really needed (equivalent to a bare "i=1/0;"), except when >> 132 compiling with -O3: "i=1/0;" is considered dead code with gcc >> 133 -O3. */ >> 134 i = 10; >> 135 while (1) >> 136 { >> 137 /* Stupid function call to fool gcc optimizations */ >> 138 sos_bochs_printf("i = 1 / %d...\n", i); >> 139 i = 1 / i; >> 140 } 575 141 576 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_sub !! 142 /* Will never print this since the "divide by zero" exception always 577 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_ !! 143 returns to the faulting instruction (see Intel x86 doc vol 3, 578 !! 144 section 5.12), thus re-evaluating the "divide-by-zero" exprssion 579 !! 145 and raising the "divide by zero" exception again and again... */ 580 !! 146 sos_x86_videomem_putstring(2, 0, 581 !! 147 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 582 !! 148 "Invisible"); 583 tty_subsystem_setup(); << 584 sos_ttyS0_subsystem_setup(); << 585 sos_console_subsystem_setup(); << 586 << 587 << 588 sos_ide_subsystem_setup(); << 589 << 590 << 591 149 592 /* Start the 'init' process, which in turns !! 150 return; 593 programs */ << 594 start_init(rootfs); << 595 /* << 596 * We can safely exit from this function now << 597 * an idle Kernel thread ready to make the C << 598 * << 599 * However, we must EXPLICITELY call sos_thr << 600 * simple "return" will return nowhere ! Act << 601 * was initialized by the Grub bootstrap sta << 602 * word "thread" did not exist. This means t << 603 * setup in order for a return here to call << 604 * automagically. Hence we must call it manu << 605 * kernel thread where we must do this manua << 606 */ << 607 sos_bochs_printf("Bye from primary thread !\ << 608 sos_thread_exit(); << 609 SOS_FATAL_ERROR("No trespassing !"); << 610 } 151 }
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