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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> >> 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> 032 054 033 /* Helper function to display each bits of a 3 055 /* Helper function to display each bits of a 32bits integer on the 034 screen as dark or light carrets */ 056 screen as dark or light carrets */ 035 static void display_bits(unsigned char row, un !! 057 void display_bits(unsigned char row, unsigned char col, 036 unsigned char attribu !! 058 unsigned char attribute, 037 sos_ui32_t integer) !! 059 sos_ui32_t integer) 038 { 060 { 039 int i; 061 int i; 040 /* Scan each bit of the integer, MSb first * 062 /* Scan each bit of the integer, MSb first */ 041 for (i = 31 ; i >= 0 ; i--) 063 for (i = 31 ; i >= 0 ; i--) 042 { 064 { 043 /* Test if bit i of 'integer' is set */ 065 /* Test if bit i of 'integer' is set */ 044 int bit_i = (integer & (1 << i)); 066 int bit_i = (integer & (1 << i)); 045 /* Ascii 219 => dark carret, Ascii 177 = 067 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 046 unsigned char ascii_code = bit_i?219:177 068 unsigned char ascii_code = bit_i?219:177; 047 sos_x86_videomem_putchar(row, col++, 069 sos_x86_videomem_putchar(row, col++, 048 attribute, 070 attribute, 049 ascii_code); 071 ascii_code); 050 } 072 } 051 } 073 } 052 074 053 << 054 /* Clock IRQ handler */ 075 /* Clock IRQ handler */ 055 static void clk_it(int intid) 076 static void clk_it(int intid) 056 { 077 { 057 static sos_ui32_t clock_count = 0; 078 static sos_ui32_t clock_count = 0; 058 079 059 display_bits(0, 48, 080 display_bits(0, 48, 060 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 081 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 061 clock_count); 082 clock_count); 062 clock_count++; 083 clock_count++; 063 084 >> 085 /* Execute the expired timeout actions (if any) */ >> 086 sos_time_do_tick(); >> 087 >> 088 /* Update scheduler statistics and status */ >> 089 sos_sched_do_timer_tick(); 064 } 090 } 065 091 066 /* Division by zero exception handler */ !! 092 067 static void divide_ex(int exid) !! 093 /* ====================================================================== >> 094 * Page fault exception handling >> 095 */ >> 096 >> 097 >> 098 /* Page fault exception handler with demand paging for the kernel */ >> 099 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 068 { 100 { 069 static sos_ui32_t div_count = 0; !! 101 static sos_ui32_t demand_paging_count = 0; >> 102 struct sos_thread * cur_thr = sos_thread_get_current(); >> 103 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); >> 104 sos_paddr_t ppage_paddr; >> 105 >> 106 if (sos_cpu_context_is_in_user_mode(ctxt) >> 107 || (cur_thr->fixup_uaccess.return_vaddr)) >> 108 { >> 109 __label__ unforce_address_space; >> 110 sos_bool_t need_to_setup_mmu; >> 111 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); >> 112 >> 113 /* Make sure to always stay in the interrupted thread's MMU >> 114 configuration */ >> 115 need_to_setup_mmu = (cur_thr->squatted_mm_context >> 116 != sos_process_get_mm_context(cur_thr->process)); >> 117 if (need_to_setup_mmu) >> 118 sos_thread_prepare_user_space_access(NULL, 0); >> 119 >> 120 if (SOS_OK == >> 121 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, >> 122 errcode & (1 << 1), >> 123 TRUE)) >> 124 goto unforce_address_space; >> 125 >> 126 /* If the page fault occured in kernel mode, return to kernel to >> 127 the fixup address */ >> 128 if (! sos_cpu_context_is_in_user_mode(ctxt)) >> 129 { >> 130 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; >> 131 sos_cpu_context_set_EX_return_address(ctxt, >> 132 cur_thr->fixup_uaccess.return_vaddr); >> 133 goto unforce_address_space; >> 134 } >> 135 >> 136 if (need_to_setup_mmu) >> 137 sos_thread_end_user_space_access(); >> 138 >> 139 sos_bochs_printf("Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\n", >> 140 sos_cpu_context_get_PC(ctxt), >> 141 (unsigned)faulting_vaddr, >> 142 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 143 sos_bochs_printf("Terminating User thread\n"); >> 144 sos_thread_exit(); >> 145 >> 146 unforce_address_space: >> 147 if (need_to_setup_mmu) >> 148 sos_thread_end_user_space_access(); >> 149 return; >> 150 } >> 151 >> 152 /* Check if address is covered by any VMM range */ >> 153 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) >> 154 { >> 155 /* No: The page fault is out of any kernel virtual region. For >> 156 the moment, we don't handle this. */ >> 157 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", >> 158 sos_cpu_context_get_PC(ctxt), >> 159 (unsigned)faulting_vaddr, >> 160 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 161 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); >> 162 } >> 163 >> 164 >> 165 /* >> 166 * Demand paging in kernel space >> 167 */ >> 168 >> 169 /* Update the number of demand paging requests handled */ >> 170 demand_paging_count ++; 070 display_bits(0, 0, 171 display_bits(0, 0, 071 SOS_X86_VIDEO_FG_LTRED | SOS_X8 172 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 072 div_count); !! 173 demand_paging_count); 073 div_count++; !! 174 >> 175 /* Allocate a new page for the virtual address */ >> 176 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); >> 177 if (! ppage_paddr) >> 178 SOS_ASSERT_FATAL(! "TODO: implement swap. (Out of mem in demand paging because no swap for kernel yet !)"); >> 179 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, >> 180 SOS_PAGE_ALIGN_INF(faulting_vaddr), >> 181 FALSE, >> 182 SOS_VM_MAP_PROT_READ >> 183 | SOS_VM_MAP_PROT_WRITE >> 184 | SOS_VM_MAP_ATOMIC)); >> 185 sos_physmem_unref_physpage(ppage_paddr); >> 186 >> 187 /* Ok, we can now return to interrupted context */ >> 188 } >> 189 >> 190 >> 191 >> 192 /* ====================================================================== >> 193 * An operating system MUST always have a ready thread ! Otherwise: >> 194 * what would the CPU have to execute ?! >> 195 */ >> 196 static void idle_thread() >> 197 { >> 198 sos_ui32_t idle_twiddle = 0; >> 199 >> 200 while (1) >> 201 { >> 202 /* Remove this instruction if you get an "Invalid opcode" CPU >> 203 exception (old 80386 CPU) */ >> 204 asm("hlt\n"); >> 205 >> 206 idle_twiddle ++; >> 207 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, >> 208 idle_twiddle); >> 209 >> 210 /* Lend the CPU to some other thread */ >> 211 sos_thread_yield(); >> 212 } >> 213 } >> 214 >> 215 >> 216 /* ====================================================================== >> 217 * Kernel thread showing some CPU usage statistics on the console every 1s >> 218 */ >> 219 #define LOAD_DISPLAY_BASELINE 4 >> 220 #define LOAD_DISPLAY_STARTROW 34 >> 221 static void stat_thread() >> 222 { >> 223 while (1) >> 224 { >> 225 sos_ui32_t flags; >> 226 sos_ui32_t load1, load5, load15; >> 227 char str1[11], str5[11], str15[11]; >> 228 struct sos_time t; >> 229 t.sec = 1; >> 230 t.nanosec = 0; >> 231 >> 232 sos_thread_sleep(& t); >> 233 >> 234 sos_disable_IRQs(flags); >> 235 >> 236 /* The IDLE task is EXcluded in the following computation */ >> 237 sos_load_get_sload(&load1, &load5, &load15); >> 238 sos_load_to_string(str1, load1); >> 239 sos_load_to_string(str5, load5); >> 240 sos_load_to_string(str15, load15); >> 241 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+0, LOAD_DISPLAY_STARTROW, >> 242 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 243 "Kernel (- Idle): %s %s %s ", >> 244 str1, str5, str15); >> 245 >> 246 sos_load_get_uload(&load1, &load5, &load15); >> 247 sos_load_to_string(str1, load1); >> 248 sos_load_to_string(str5, load5); >> 249 sos_load_to_string(str15, load15); >> 250 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+1, LOAD_DISPLAY_STARTROW, >> 251 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 252 "User: %s %s %s ", >> 253 str1, str5, str15); >> 254 >> 255 sos_load_get_uratio(&load1, &load5, &load15); >> 256 sos_load_to_string(str1, load1); >> 257 sos_load_to_string(str5, load5); >> 258 sos_load_to_string(str15, load15); >> 259 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+2, LOAD_DISPLAY_STARTROW, >> 260 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 261 "User CPU %%: %s %s %s ", >> 262 str1, str5, str15); >> 263 >> 264 /* The IDLE task is INcluded in the following computation */ >> 265 sos_load_get_sratio(&load1, &load5, &load15); >> 266 sos_load_to_string(str1, load1); >> 267 sos_load_to_string(str5, load5); >> 268 sos_load_to_string(str15, load15); >> 269 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+3, LOAD_DISPLAY_STARTROW, >> 270 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 271 "Kernel CPU %% (+ Idle): %s %s %s ", >> 272 str1, str5, str15); >> 273 sos_restore_IRQs(flags); >> 274 } >> 275 } >> 276 >> 277 >> 278 /* ====================================================================== >> 279 * Start the "init" (userland) process >> 280 */ >> 281 static sos_ret_t >> 282 start_init(struct sos_fs_manager_instance * rootfs) >> 283 { >> 284 sos_ret_t retval; >> 285 struct sos_umem_vmm_as *as_init; >> 286 struct sos_process *proc_init; >> 287 struct sos_thread *new_thr; >> 288 sos_uaddr_t ustack, start_uaddr; >> 289 struct sos_fs_opened_file * init_root, * init_cwd, * unused_of; >> 290 >> 291 /* Create the new process */ >> 292 proc_init = sos_process_create("init", FALSE); >> 293 if (! proc_init) >> 294 return -SOS_ENOMEM; >> 295 as_init = sos_process_get_address_space(proc_init); >> 296 >> 297 >> 298 /* >> 299 * Setup the root and CWD directories of the process. The root of >> 300 * this process will correspond to the "global" root of the whole >> 301 * system since all the future processes will duplicate it ! >> 302 */ >> 303 retval = sos_fs_new_opened_file(proc_init, rootfs->root, >> 304 SOS_FS_OPEN_READ | SOS_FS_OPEN_WRITE, >> 305 & init_root); >> 306 if (SOS_OK != retval) >> 307 { >> 308 sos_process_unref(proc_init); >> 309 return -SOS_ENOENT; >> 310 } >> 311 >> 312 /* Duplicate the root file to set the current working directory of >> 313 the init process */ >> 314 retval = sos_fs_duplicate_opened_file(init_root, proc_init, >> 315 & init_cwd); >> 316 if (SOS_OK != retval) >> 317 { >> 318 sos_fs_close(init_root); >> 319 sos_process_unref(proc_init); >> 320 return -SOS_ENOENT; >> 321 } >> 322 >> 323 /* Now update the process ! */ >> 324 if ( ( SOS_OK != sos_process_chroot(proc_init, init_root, & unused_of) ) >> 325 || ( SOS_OK != sos_process_chdir(proc_init, init_cwd, & unused_of) ) ) >> 326 { >> 327 sos_fs_close(init_root); >> 328 sos_fs_close(init_cwd); >> 329 sos_process_chroot(proc_init, NULL, & unused_of); >> 330 sos_process_chdir(proc_init, NULL, & unused_of); >> 331 sos_process_unref(proc_init); >> 332 return -SOS_ENOENT; >> 333 } >> 334 >> 335 >> 336 >> 337 /* Map the 'init' program in user space */ >> 338 start_uaddr = sos_binfmt_elf32_map(as_init, "init"); >> 339 if (0 == start_uaddr) >> 340 { >> 341 sos_process_unref(proc_init); >> 342 return -SOS_ENOENT; >> 343 } >> 344 >> 345 /* Allocate the user stack */ >> 346 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; >> 347 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, >> 348 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, >> 349 /* PRIVATE */ 0); >> 350 if (SOS_OK != retval) >> 351 { >> 352 sos_process_unref(proc_init); >> 353 return -SOS_ENOMEM; >> 354 } >> 355 >> 356 /* Now create the user thread */ >> 357 new_thr = sos_create_user_thread(NULL, >> 358 proc_init, >> 359 start_uaddr, >> 360 0, 0, >> 361 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, >> 362 SOS_SCHED_PRIO_TS_LOWEST); >> 363 if (! new_thr) >> 364 { >> 365 sos_process_unref(proc_init); >> 366 return -SOS_ENOMEM; >> 367 } >> 368 >> 369 sos_process_unref(proc_init); >> 370 return SOS_OK; 074 } 371 } 075 372 076 /* The C entry point of our operating system * !! 373 077 void sos_main(unsigned long magic, unsigned lo !! 374 /* ====================================================================== >> 375 * The C entry point of our operating system >> 376 */ >> 377 void sos_main(unsigned long magic, unsigned long arg) 078 { 378 { 079 unsigned i; 379 unsigned i; >> 380 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; >> 381 struct sos_time tick_resolution; >> 382 struct sos_fs_manager_instance * rootfs; 080 383 081 /* Grub sends us a structure, called multibo !! 384 /* Size of RAM above 1MB. Might be undefined ! */ 082 precious informations about the system, s !! 385 unsigned long int upper_mem = 0; 083 documentation for more information. */ << 084 multiboot_info_t *mbi; << 085 mbi = (multiboot_info_t *) addr; << 086 386 087 /* Setup bochs and console, and clear the co 387 /* Setup bochs and console, and clear the console */ 088 sos_bochs_setup(); !! 388 sos_bochs_subsystem_setup(); 089 389 090 sos_x86_videomem_setup(); 390 sos_x86_videomem_setup(); 091 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 391 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 092 392 093 /* Greetings from SOS */ 393 /* Greetings from SOS */ 094 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 394 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 095 /* Loaded with Grub */ !! 395 { 096 sos_x86_videomem_printf(1, 0, !! 396 /* Grub sends us a structure, called multiboot_info_t with a lot of 097 SOS_X86_VIDEO_FG_Y !! 397 precious informations about the system, see the multiboot 098 "Welcome From GRUB !! 398 documentation for more information. */ 099 "SOS", ',', !! 399 multiboot_info_t *mbi = (multiboot_info_t *) arg; 100 (unsigned)(mbi->me !! 400 101 (unsigned)mbi->mem !! 401 /* Multiboot says: "The value returned for upper memory is >> 402 maximally the address of the first upper memory hole minus 1 >> 403 megabyte.". It also adds: "It is not guaranteed to be this >> 404 value." aka "YMMV" ;) */ >> 405 upper_mem = mbi->mem_upper; >> 406 sos_x86_videomem_printf(1, 0, >> 407 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 408 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 409 "SOS article 9", ',', >> 410 (unsigned)(upper_mem >> 10) + 1, >> 411 (unsigned)upper_mem); >> 412 } >> 413 else if (magic == 0x42244224) >> 414 { >> 415 /* Loaded with SOS bootsect */ >> 416 upper_mem = arg; >> 417 sos_x86_videomem_printf(1, 0, >> 418 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 419 "Welcome to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 420 "SOS article 9", ',', >> 421 (unsigned)(upper_mem >> 10) + 1, >> 422 (unsigned)upper_mem); >> 423 } 102 else 424 else 103 /* Not loaded with grub */ !! 425 /* Not loaded with grub, not from an enhanced bootsect */ 104 sos_x86_videomem_printf(1, 0, 426 sos_x86_videomem_printf(1, 0, 105 SOS_X86_VIDEO_FG_Y 427 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 106 "Welcome to SOS"); !! 428 "Welcome to SOS article 9"); 107 429 108 sos_bochs_putstring("Message in a bochs\n"); !! 430 sos_bochs_putstring("Message in a bochs: This is SOS article 9.\n"); 109 431 110 /* Setup CPU segmentation and IRQ subsystem 432 /* Setup CPU segmentation and IRQ subsystem */ 111 sos_gdt_setup(); !! 433 sos_gdt_subsystem_setup(); 112 sos_idt_setup(); !! 434 sos_idt_subsystem_setup(); 113 435 114 /* Setup SOS IRQs and exceptions subsystem * 436 /* Setup SOS IRQs and exceptions subsystem */ 115 sos_exceptions_setup(); !! 437 sos_exception_subsystem_setup(); 116 sos_irq_setup(); !! 438 sos_irq_subsystem_setup(); 117 439 118 /* Configure the timer so as to raise the IR 440 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 119 sos_i8254_set_frequency(100); 441 sos_i8254_set_frequency(100); 120 442 >> 443 /* Setup the kernel time subsystem to get prepared to take the timer >> 444 ticks into account */ >> 445 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; >> 446 sos_time_subsysem_setup(& tick_resolution); >> 447 >> 448 /* We need to know the RAM size */ >> 449 if (upper_mem == 0) >> 450 { >> 451 sos_x86_videomem_putstring(20, 0, >> 452 SOS_X86_VIDEO_FG_LTRED >> 453 | SOS_X86_VIDEO_BG_BLUE >> 454 | SOS_X86_VIDEO_FG_BLINKING, >> 455 "I don't know RAM size ! Load me with Grub..."); >> 456 /* STOP ! */ >> 457 for (;;) >> 458 continue; >> 459 } >> 460 >> 461 /* >> 462 * Some interrupt handlers >> 463 */ >> 464 121 /* Binding some HW interrupts and exceptions 465 /* Binding some HW interrupts and exceptions to software routines */ 122 sos_irq_set_routine(SOS_IRQ_TIMER, 466 sos_irq_set_routine(SOS_IRQ_TIMER, 123 clk_it); !! 467 clk_it); 124 sos_exception_set_routine(SOS_EXCEPT_DIVIDE_ !! 468 125 divide_ex); !! 469 /* >> 470 * Setup physical memory management >> 471 */ >> 472 >> 473 SOS_ASSERT_FATAL(SOS_OK >> 474 == sos_physmem_subsystem_setup((upper_mem<<10) + (1<<20), >> 475 &sos_kernel_core_base_paddr, >> 476 &sos_kernel_core_top_paddr)); >> 477 >> 478 /* >> 479 * Switch to paged-memory mode >> 480 */ >> 481 >> 482 /* Disabling interrupts should seem more correct, but it's not really >> 483 necessary at this stage */ >> 484 SOS_ASSERT_FATAL(SOS_OK == >> 485 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, >> 486 sos_kernel_core_top_paddr)); >> 487 >> 488 /* Bind the page fault exception */ >> 489 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, >> 490 pgflt_ex); >> 491 >> 492 /* >> 493 * Setup kernel virtual memory allocator >> 494 */ >> 495 >> 496 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, >> 497 sos_kernel_core_top_paddr, >> 498 bootstrap_stack_bottom, >> 499 bootstrap_stack_bottom >> 500 + bootstrap_stack_size)) >> 501 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); >> 502 >> 503 if (sos_kmalloc_subsystem_setup()) >> 504 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); >> 505 >> 506 /* >> 507 * Initialize the MMU context subsystem >> 508 */ >> 509 sos_mm_context_subsystem_setup(); >> 510 >> 511 /* >> 512 * Initialize the CPU context subsystem >> 513 */ >> 514 sos_cpu_context_subsystem_setup(); >> 515 >> 516 /* >> 517 * Bind the syscall handler to its software interrupt handler >> 518 */ >> 519 sos_swintr_subsystem_setup(); >> 520 >> 521 >> 522 /* >> 523 * Initialize the Kernel thread and scheduler subsystems >> 524 */ >> 525 >> 526 /* Initialize kernel thread subsystem */ >> 527 sos_thread_subsystem_setup(bootstrap_stack_bottom, >> 528 bootstrap_stack_size); >> 529 >> 530 /* Initialize the scheduler */ >> 531 sos_sched_subsystem_setup(); >> 532 >> 533 /* Declare the IDLE thread */ >> 534 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, >> 535 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 536 >> 537 /* Prepare the stats subsystem */ >> 538 sos_load_subsystem_setup(); >> 539 >> 540 /* Declare a thread that prints some stats */ >> 541 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, >> 542 NULL, >> 543 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 544 >> 545 >> 546 /* >> 547 * Initialise user address space management subsystem >> 548 */ >> 549 sos_umem_vmm_subsystem_setup(); >> 550 sos_dev_zero_subsystem_setup(); >> 551 sos_dev_mem_chardev_setup(); >> 552 >> 553 /* >> 554 * Initialize process stuff >> 555 */ >> 556 sos_process_subsystem_setup(); >> 557 >> 558 126 /* Enabling the HW interrupts here, this wil 559 /* Enabling the HW interrupts here, this will make the timer HW 127 interrupt call our clk_it handler */ !! 560 interrupt call the scheduler */ 128 asm volatile ("sti\n"); 561 asm volatile ("sti\n"); 129 562 130 /* 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 } << 141 563 142 /* Will never print this since the "divide b !! 564 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_subsystem_setup()); 143 returns to the faulting instruction (see !! 565 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_setup(NULL, 144 section 5.12), thus re-evaluating the "di !! 566 "virtfs", 145 and raising the "divide by zero" exceptio !! 567 NULL, 146 sos_x86_videomem_putstring(2, 0, !! 568 & rootfs)); 147 SOS_X86_VIDEO_FG_ !! 569 148 "Invisible"); !! 570 >> 571 tty_subsystem_setup(); >> 572 sos_ttyS0_subsystem_setup(); >> 573 sos_console_subsystem_setup(); >> 574 >> 575 >> 576 149 577 150 return; !! 578 /* Start the 'init' process, which in turns launches the other >> 579 programs */ >> 580 start_init(rootfs); >> 581 /* >> 582 * We can safely exit from this function now, for there is already >> 583 * an idle Kernel thread ready to make the CPU busy working... >> 584 * >> 585 * However, we must EXPLICITELY call sos_thread_exit() because a >> 586 * simple "return" will return nowhere ! Actually this first thread >> 587 * was initialized by the Grub bootstrap stage, at a time when the >> 588 * word "thread" did not exist. This means that the stack was not >> 589 * setup in order for a return here to call sos_thread_exit() >> 590 * automagically. Hence we must call it manually. This is the ONLY >> 591 * kernel thread where we must do this manually. >> 592 */ >> 593 sos_bochs_printf("Bye from primary thread !\n"); >> 594 sos_thread_exit(); >> 595 SOS_FATAL_ERROR("No trespassing !"); 151 } 596 }
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