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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 << 003 002 004 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 005 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 006 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 007 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 008 007 009 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU General Public License for more details 011 GNU General Public License for more details. 013 012 014 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 015 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 017 USA. 016 USA. 018 */ 017 */ 019 018 >> 019 #include <sos/errno.h> >> 020 020 /* Include definitions of the multiboot standa 021 /* Include definitions of the multiboot standard */ 021 #include <bootstrap/multiboot.h> 022 #include <bootstrap/multiboot.h> 022 #include <hwcore/idt.h> 023 #include <hwcore/idt.h> 023 #include <hwcore/gdt.h> 024 #include <hwcore/gdt.h> 024 #include <hwcore/irq.h> 025 #include <hwcore/irq.h> 025 #include <hwcore/exception.h> 026 #include <hwcore/exception.h> 026 #include <hwcore/i8254.h> 027 #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> 027 #include <sos/klibc.h> 039 #include <sos/klibc.h> 028 #include <sos/assert.h> 040 #include <sos/assert.h> 029 #include <drivers/x86_videomem.h> 041 #include <drivers/x86_videomem.h> 030 #include <drivers/bochs.h> 042 #include <drivers/bochs.h> 031 !! 043 #include <sos/calcload.h> >> 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> 032 049 033 /* Helper function to display each bits of a 3 050 /* Helper function to display each bits of a 32bits integer on the 034 screen as dark or light carrets */ 051 screen as dark or light carrets */ 035 static void display_bits(unsigned char row, un !! 052 void display_bits(unsigned char row, unsigned char col, 036 unsigned char attribu !! 053 unsigned char attribute, 037 sos_ui32_t integer) !! 054 sos_ui32_t integer) 038 { 055 { 039 int i; 056 int i; 040 /* Scan each bit of the integer, MSb first * 057 /* Scan each bit of the integer, MSb first */ 041 for (i = 31 ; i >= 0 ; i--) 058 for (i = 31 ; i >= 0 ; i--) 042 { 059 { 043 /* Test if bit i of 'integer' is set */ 060 /* Test if bit i of 'integer' is set */ 044 int bit_i = (integer & (1 << i)); 061 int bit_i = (integer & (1 << i)); 045 /* Ascii 219 => dark carret, Ascii 177 = 062 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 046 unsigned char ascii_code = bit_i?219:177 063 unsigned char ascii_code = bit_i?219:177; 047 sos_x86_videomem_putchar(row, col++, 064 sos_x86_videomem_putchar(row, col++, 048 attribute, 065 attribute, 049 ascii_code); 066 ascii_code); 050 } 067 } 051 } 068 } 052 069 053 << 054 /* Clock IRQ handler */ 070 /* Clock IRQ handler */ 055 static void clk_it(int intid) 071 static void clk_it(int intid) 056 { 072 { 057 static sos_ui32_t clock_count = 0; 073 static sos_ui32_t clock_count = 0; 058 074 059 display_bits(0, 48, 075 display_bits(0, 48, 060 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 076 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 061 clock_count); 077 clock_count); 062 clock_count++; 078 clock_count++; 063 079 >> 080 /* Execute the expired timeout actions (if any) */ >> 081 sos_time_do_tick(); >> 082 >> 083 /* Update scheduler statistics and status */ >> 084 sos_sched_do_timer_tick(); 064 } 085 } 065 086 066 /* Division by zero exception handler */ !! 087 067 static void divide_ex(int exid) !! 088 /* ====================================================================== >> 089 * Page fault exception handling >> 090 */ >> 091 >> 092 >> 093 /* Page fault exception handler with demand paging for the kernel */ >> 094 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 068 { 095 { 069 static sos_ui32_t div_count = 0; !! 096 static sos_ui32_t demand_paging_count = 0; >> 097 struct sos_thread * cur_thr = sos_thread_get_current(); >> 098 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); >> 099 sos_paddr_t ppage_paddr; >> 100 >> 101 if (sos_cpu_context_is_in_user_mode(ctxt) >> 102 || (cur_thr->fixup_uaccess.return_vaddr)) >> 103 { >> 104 __label__ unforce_address_space; >> 105 sos_bool_t need_to_setup_mmu; >> 106 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); >> 107 >> 108 /* Make sure to always stay in the interrupted thread's MMU >> 109 configuration */ >> 110 need_to_setup_mmu = (cur_thr->squatted_mm_context >> 111 != sos_process_get_mm_context(cur_thr->process)); >> 112 if (need_to_setup_mmu) >> 113 sos_thread_prepare_user_space_access(NULL, 0); >> 114 >> 115 if (SOS_OK == >> 116 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, >> 117 errcode & (1 << 1), >> 118 TRUE)) >> 119 goto unforce_address_space; >> 120 >> 121 /* If the page fault occured in kernel mode, return to kernel to >> 122 the fixup address */ >> 123 if (! sos_cpu_context_is_in_user_mode(ctxt)) >> 124 { >> 125 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; >> 126 sos_cpu_context_set_EX_return_address(ctxt, >> 127 cur_thr->fixup_uaccess.return_vaddr); >> 128 goto unforce_address_space; >> 129 } >> 130 >> 131 if (need_to_setup_mmu) >> 132 sos_thread_end_user_space_access(); >> 133 >> 134 sos_bochs_printf("Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\n", >> 135 sos_cpu_context_get_PC(ctxt), >> 136 (unsigned)faulting_vaddr, >> 137 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 138 sos_bochs_printf("Terminating User thread\n"); >> 139 sos_thread_exit(); >> 140 >> 141 unforce_address_space: >> 142 if (need_to_setup_mmu) >> 143 sos_thread_end_user_space_access(); >> 144 return; >> 145 } >> 146 >> 147 /* Check if address is covered by any VMM range */ >> 148 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) >> 149 { >> 150 /* No: The page fault is out of any kernel virtual region. For >> 151 the moment, we don't handle this. */ >> 152 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", >> 153 sos_cpu_context_get_PC(ctxt), >> 154 (unsigned)faulting_vaddr, >> 155 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 156 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); >> 157 } >> 158 >> 159 >> 160 /* >> 161 * Demand paging in kernel space >> 162 */ >> 163 >> 164 /* Update the number of demand paging requests handled */ >> 165 demand_paging_count ++; 070 display_bits(0, 0, 166 display_bits(0, 0, 071 SOS_X86_VIDEO_FG_LTRED | SOS_X8 167 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 072 div_count); !! 168 demand_paging_count); 073 div_count++; !! 169 >> 170 /* Allocate a new page for the virtual address */ >> 171 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); >> 172 if (! ppage_paddr) >> 173 SOS_ASSERT_FATAL(! "TODO: implement swap. (Out of mem in demand paging because no swap for kernel yet !)"); >> 174 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, >> 175 SOS_PAGE_ALIGN_INF(faulting_vaddr), >> 176 FALSE, >> 177 SOS_VM_MAP_PROT_READ >> 178 | SOS_VM_MAP_PROT_WRITE >> 179 | SOS_VM_MAP_ATOMIC)); >> 180 sos_physmem_unref_physpage(ppage_paddr); >> 181 >> 182 /* Ok, we can now return to interrupted context */ >> 183 } >> 184 >> 185 >> 186 >> 187 /* ====================================================================== >> 188 * An operating system MUST always have a ready thread ! Otherwise: >> 189 * what would the CPU have to execute ?! >> 190 */ >> 191 static void idle_thread() >> 192 { >> 193 sos_ui32_t idle_twiddle = 0; >> 194 >> 195 while (1) >> 196 { >> 197 /* Remove this instruction if you get an "Invalid opcode" CPU >> 198 exception (old 80386 CPU) */ >> 199 asm("hlt\n"); >> 200 >> 201 idle_twiddle ++; >> 202 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, >> 203 idle_twiddle); >> 204 >> 205 /* Lend the CPU to some other thread */ >> 206 sos_thread_yield(); >> 207 } >> 208 } >> 209 >> 210 >> 211 /* ====================================================================== >> 212 * Kernel thread showing some CPU usage statistics on the console every 1s >> 213 */ >> 214 static void stat_thread() >> 215 { >> 216 while (1) >> 217 { >> 218 sos_ui32_t flags; >> 219 sos_ui32_t load1, load5, load15; >> 220 char str1[11], str5[11], str15[11]; >> 221 struct sos_time t; >> 222 t.sec = 1; >> 223 t.nanosec = 0; >> 224 >> 225 sos_thread_sleep(& t); >> 226 >> 227 sos_disable_IRQs(flags); >> 228 >> 229 /* The IDLE task is EXcluded in the following computation */ >> 230 sos_load_get_sload(&load1, &load5, &load15); >> 231 sos_load_to_string(str1, load1); >> 232 sos_load_to_string(str5, load5); >> 233 sos_load_to_string(str15, load15); >> 234 sos_x86_videomem_printf(16, 34, >> 235 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 236 "Kernel (- Idle): %s %s %s ", >> 237 str1, str5, str15); >> 238 >> 239 sos_load_get_uload(&load1, &load5, &load15); >> 240 sos_load_to_string(str1, load1); >> 241 sos_load_to_string(str5, load5); >> 242 sos_load_to_string(str15, load15); >> 243 sos_x86_videomem_printf(17, 34, >> 244 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 245 "User: %s %s %s ", >> 246 str1, str5, str15); >> 247 >> 248 sos_load_get_uratio(&load1, &load5, &load15); >> 249 sos_load_to_string(str1, load1); >> 250 sos_load_to_string(str5, load5); >> 251 sos_load_to_string(str15, load15); >> 252 sos_x86_videomem_printf(18, 34, >> 253 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 254 "User CPU %%: %s %s %s ", >> 255 str1, str5, str15); >> 256 >> 257 /* The IDLE task is INcluded in the following computation */ >> 258 sos_load_get_sratio(&load1, &load5, &load15); >> 259 sos_load_to_string(str1, load1); >> 260 sos_load_to_string(str5, load5); >> 261 sos_load_to_string(str15, load15); >> 262 sos_x86_videomem_printf(19, 34, >> 263 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 264 "Kernel CPU %% (+ Idle): %s %s %s ", >> 265 str1, str5, str15); >> 266 sos_restore_IRQs(flags); >> 267 } >> 268 } >> 269 >> 270 >> 271 /* ====================================================================== >> 272 * Start the "init" (userland) process >> 273 */ >> 274 static sos_ret_t >> 275 start_init(struct sos_fs_manager_instance * rootfs) >> 276 { >> 277 sos_ret_t retval; >> 278 struct sos_umem_vmm_as *as_init; >> 279 struct sos_process *proc_init; >> 280 struct sos_thread *new_thr; >> 281 sos_uaddr_t ustack, start_uaddr; >> 282 struct sos_fs_opened_file * init_root, * init_cwd, * unused_of; >> 283 >> 284 /* Create the new process */ >> 285 proc_init = sos_process_create("init", FALSE); >> 286 if (! proc_init) >> 287 return -SOS_ENOMEM; >> 288 as_init = sos_process_get_address_space(proc_init); >> 289 >> 290 >> 291 /* >> 292 * Setup the root and CWD directories of the process. The root of >> 293 * this process will correspond to the "global" root of the whole >> 294 * system since all the future processes will duplicate it ! >> 295 */ >> 296 retval = sos_fs_new_opened_file(proc_init, rootfs->root, >> 297 SOS_FS_OPEN_READ | SOS_FS_OPEN_WRITE, >> 298 & init_root); >> 299 if (SOS_OK != retval) >> 300 { >> 301 sos_process_unref(proc_init); >> 302 return -SOS_ENOENT; >> 303 } >> 304 >> 305 /* Duplicate the root file to set the current working directory of >> 306 the init process */ >> 307 retval = sos_fs_duplicate_opened_file(init_root, proc_init, >> 308 & init_cwd); >> 309 if (SOS_OK != retval) >> 310 { >> 311 sos_fs_close(init_root); >> 312 sos_process_unref(proc_init); >> 313 return -SOS_ENOENT; >> 314 } >> 315 >> 316 /* Now update the process ! */ >> 317 if ( ( SOS_OK != sos_process_chroot(proc_init, init_root, & unused_of) ) >> 318 || ( SOS_OK != sos_process_chdir(proc_init, init_cwd, & unused_of) ) ) >> 319 { >> 320 sos_fs_close(init_root); >> 321 sos_fs_close(init_cwd); >> 322 sos_process_chroot(proc_init, NULL, & unused_of); >> 323 sos_process_chdir(proc_init, NULL, & unused_of); >> 324 sos_process_unref(proc_init); >> 325 return -SOS_ENOENT; >> 326 } >> 327 >> 328 /* Map the 'init' program in user space */ >> 329 start_uaddr = sos_binfmt_elf32_map(as_init, "init"); >> 330 if (0 == start_uaddr) >> 331 { >> 332 sos_process_unref(proc_init); >> 333 return -SOS_ENOENT; >> 334 } >> 335 >> 336 /* Allocate the user stack */ >> 337 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; >> 338 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, >> 339 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, >> 340 /* PRIVATE */ 0); >> 341 if (SOS_OK != retval) >> 342 { >> 343 sos_process_unref(proc_init); >> 344 return -SOS_ENOMEM; >> 345 } >> 346 >> 347 /* Now create the user thread */ >> 348 new_thr = sos_create_user_thread(NULL, >> 349 proc_init, >> 350 start_uaddr, >> 351 0, 0, >> 352 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, >> 353 SOS_SCHED_PRIO_TS_LOWEST); >> 354 if (! new_thr) >> 355 { >> 356 sos_process_unref(proc_init); >> 357 return -SOS_ENOMEM; >> 358 } >> 359 >> 360 sos_process_unref(proc_init); >> 361 return SOS_OK; 074 } 362 } 075 363 076 /* The C entry point of our operating system * !! 364 077 void sos_main(unsigned long magic, unsigned lo !! 365 /* ====================================================================== >> 366 * The C entry point of our operating system >> 367 */ >> 368 void sos_main(unsigned long magic, unsigned long arg) 078 { 369 { 079 unsigned i; 370 unsigned i; >> 371 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; >> 372 struct sos_time tick_resolution; >> 373 struct sos_fs_manager_instance * rootfs; 080 374 081 /* Grub sends us a structure, called multibo !! 375 /* Size of RAM above 1MB. Might be undefined ! */ 082 precious informations about the system, s !! 376 unsigned long int upper_mem = 0; 083 documentation for more information. */ << 084 multiboot_info_t *mbi; << 085 mbi = (multiboot_info_t *) addr; << 086 377 087 /* Setup bochs and console, and clear the co 378 /* Setup bochs and console, and clear the console */ 088 sos_bochs_setup(); 379 sos_bochs_setup(); 089 380 090 sos_x86_videomem_setup(); 381 sos_x86_videomem_setup(); 091 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 382 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 092 383 093 /* Greetings from SOS */ 384 /* Greetings from SOS */ 094 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 385 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 095 /* Loaded with Grub */ !! 386 { 096 sos_x86_videomem_printf(1, 0, !! 387 /* Grub sends us a structure, called multiboot_info_t with a lot of 097 SOS_X86_VIDEO_FG_Y !! 388 precious informations about the system, see the multiboot 098 "Welcome From GRUB !! 389 documentation for more information. */ 099 "SOS", ',', !! 390 multiboot_info_t *mbi = (multiboot_info_t *) arg; 100 (unsigned)(mbi->me !! 391 101 (unsigned)mbi->mem !! 392 /* Multiboot says: "The value returned for upper memory is >> 393 maximally the address of the first upper memory hole minus 1 >> 394 megabyte.". It also adds: "It is not guaranteed to be this >> 395 value." aka "YMMV" ;) */ >> 396 upper_mem = mbi->mem_upper; >> 397 sos_x86_videomem_printf(1, 0, >> 398 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 399 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 400 "SOS article 8", ',', >> 401 (unsigned)(upper_mem >> 10) + 1, >> 402 (unsigned)upper_mem); >> 403 } >> 404 else if (magic == 0x42244224) >> 405 { >> 406 /* Loaded with SOS bootsect */ >> 407 upper_mem = arg; >> 408 sos_x86_videomem_printf(1, 0, >> 409 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 410 "Welcome to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 411 "SOS article 8", ',', >> 412 (unsigned)(upper_mem >> 10) + 1, >> 413 (unsigned)upper_mem); >> 414 } 102 else 415 else 103 /* Not loaded with grub */ !! 416 /* Not loaded with grub, not from an enhanced bootsect */ 104 sos_x86_videomem_printf(1, 0, 417 sos_x86_videomem_printf(1, 0, 105 SOS_X86_VIDEO_FG_Y 418 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 106 "Welcome to SOS"); !! 419 "Welcome to SOS article 8"); 107 420 108 sos_bochs_putstring("Message in a bochs\n"); !! 421 sos_bochs_putstring("Message in a bochs: This is SOS article 8.\n"); 109 422 110 /* Setup CPU segmentation and IRQ subsystem 423 /* Setup CPU segmentation and IRQ subsystem */ 111 sos_gdt_setup(); !! 424 sos_gdt_subsystem_setup(); 112 sos_idt_setup(); !! 425 sos_idt_subsystem_setup(); 113 426 114 /* Setup SOS IRQs and exceptions subsystem * 427 /* Setup SOS IRQs and exceptions subsystem */ 115 sos_exceptions_setup(); !! 428 sos_exception_subsystem_setup(); 116 sos_irq_setup(); !! 429 sos_irq_subsystem_setup(); 117 430 118 /* Configure the timer so as to raise the IR 431 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 119 sos_i8254_set_frequency(100); 432 sos_i8254_set_frequency(100); 120 433 >> 434 /* Setup the kernel time subsystem to get prepared to take the timer >> 435 ticks into account */ >> 436 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; >> 437 sos_time_subsysem_setup(& tick_resolution); >> 438 >> 439 /* We need to know the RAM size */ >> 440 if (upper_mem == 0) >> 441 { >> 442 sos_x86_videomem_putstring(20, 0, >> 443 SOS_X86_VIDEO_FG_LTRED >> 444 | SOS_X86_VIDEO_BG_BLUE >> 445 | SOS_X86_VIDEO_FG_BLINKING, >> 446 "I don't know RAM size ! Load me with Grub..."); >> 447 /* STOP ! */ >> 448 for (;;) >> 449 continue; >> 450 } >> 451 >> 452 /* >> 453 * Some interrupt handlers >> 454 */ >> 455 121 /* Binding some HW interrupts and exceptions 456 /* Binding some HW interrupts and exceptions to software routines */ 122 sos_irq_set_routine(SOS_IRQ_TIMER, 457 sos_irq_set_routine(SOS_IRQ_TIMER, 123 clk_it); !! 458 clk_it); 124 sos_exception_set_routine(SOS_EXCEPT_DIVIDE_ !! 459 125 divide_ex); !! 460 /* >> 461 * Setup physical memory management >> 462 */ >> 463 >> 464 SOS_ASSERT_FATAL(SOS_OK >> 465 == sos_physmem_subsystem_setup((upper_mem<<10) + (1<<20), >> 466 &sos_kernel_core_base_paddr, >> 467 &sos_kernel_core_top_paddr)); >> 468 >> 469 /* >> 470 * Switch to paged-memory mode >> 471 */ >> 472 >> 473 /* Disabling interrupts should seem more correct, but it's not really >> 474 necessary at this stage */ >> 475 SOS_ASSERT_FATAL(SOS_OK == >> 476 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, >> 477 sos_kernel_core_top_paddr)); >> 478 >> 479 /* Bind the page fault exception */ >> 480 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, >> 481 pgflt_ex); >> 482 >> 483 /* >> 484 * Setup kernel virtual memory allocator >> 485 */ >> 486 >> 487 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, >> 488 sos_kernel_core_top_paddr, >> 489 bootstrap_stack_bottom, >> 490 bootstrap_stack_bottom >> 491 + bootstrap_stack_size)) >> 492 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); >> 493 >> 494 if (sos_kmalloc_subsystem_setup()) >> 495 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); >> 496 >> 497 /* >> 498 * Initialize the MMU context subsystem >> 499 */ >> 500 sos_mm_context_subsystem_setup(); >> 501 >> 502 /* >> 503 * Initialize the CPU context subsystem >> 504 */ >> 505 sos_cpu_context_subsystem_setup(); >> 506 >> 507 /* >> 508 * Bind the syscall handler to its software interrupt handler >> 509 */ >> 510 sos_swintr_subsystem_setup(); >> 511 >> 512 >> 513 /* >> 514 * Initialize the Kernel thread and scheduler subsystems >> 515 */ >> 516 >> 517 /* Initialize kernel thread subsystem */ >> 518 sos_thread_subsystem_setup(bootstrap_stack_bottom, >> 519 bootstrap_stack_size); >> 520 >> 521 /* Initialize the scheduler */ >> 522 sos_sched_subsystem_setup(); >> 523 >> 524 /* Declare the IDLE thread */ >> 525 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, >> 526 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 527 >> 528 /* Prepare the stats subsystem */ >> 529 sos_load_subsystem_setup(); >> 530 >> 531 /* Declare a thread that prints some stats */ >> 532 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, >> 533 NULL, >> 534 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 535 >> 536 >> 537 /* >> 538 * Initialise user address space management subsystem >> 539 */ >> 540 sos_umem_vmm_subsystem_setup(); >> 541 sos_dev_zero_subsystem_setup(); >> 542 >> 543 /* >> 544 * Initialize process stuff >> 545 */ >> 546 sos_process_subsystem_setup(); >> 547 >> 548 126 /* Enabling the HW interrupts here, this wil 549 /* Enabling the HW interrupts here, this will make the timer HW 127 interrupt call our clk_it handler */ !! 550 interrupt call the scheduler */ 128 asm volatile ("sti\n"); 551 asm volatile ("sti\n"); 129 552 130 /* Raise a rafale of 'division by 0' excepti << 131 not really needed (equivalent to a bare " << 132 compiling with -O3: "i=1/0;" is considere << 133 -O3. */ << 134 i = 10; << 135 while (1) << 136 { << 137 /* Stupid function call to fool gcc opti << 138 sos_bochs_printf("i = 1 / %d...\n", i); << 139 i = 1 / i; << 140 } << 141 << 142 /* Will never print this since the "divide b << 143 returns to the faulting instruction (see << 144 section 5.12), thus re-evaluating the "di << 145 and raising the "divide by zero" exceptio << 146 sos_x86_videomem_putstring(2, 0, << 147 SOS_X86_VIDEO_FG_ << 148 "Invisible"); << 149 553 150 return; !! 554 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_subsystem_setup()); >> 555 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_setup(NULL, >> 556 "virtfs", >> 557 NULL, >> 558 & rootfs)); >> 559 >> 560 >> 561 /* Start the 'init' process, which in turns launches the other >> 562 programs */ >> 563 start_init(rootfs); >> 564 /* >> 565 * We can safely exit from this function now, for there is already >> 566 * an idle Kernel thread ready to make the CPU busy working... >> 567 * >> 568 * However, we must EXPLICITELY call sos_thread_exit() because a >> 569 * simple "return" will return nowhere ! Actually this first thread >> 570 * was initialized by the Grub bootstrap stage, at a time when the >> 571 * word "thread" did not exist. This means that the stack was not >> 572 * setup in order for a return here to call sos_thread_exit() >> 573 * automagically. Hence we must call it manually. This is the ONLY >> 574 * kernel thread where we must do this manually. >> 575 */ >> 576 sos_bochs_printf("Bye from primary thread !\n"); >> 577 sos_thread_exit(); >> 578 SOS_FATAL_ERROR("No trespassing !"); 151 } 579 }
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