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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> >> 054 #include <sos/blkdev.h> >> 055 #include <sos/fs_pagecache.h> >> 056 #include <drivers/ide.h> 032 057 033 /* Helper function to display each bits of a 3 058 /* Helper function to display each bits of a 32bits integer on the 034 screen as dark or light carrets */ 059 screen as dark or light carrets */ 035 static void display_bits(unsigned char row, un !! 060 void display_bits(unsigned char row, unsigned char col, 036 unsigned char attribu !! 061 unsigned char attribute, 037 sos_ui32_t integer) !! 062 sos_ui32_t integer) 038 { 063 { 039 int i; 064 int i; 040 /* Scan each bit of the integer, MSb first * 065 /* Scan each bit of the integer, MSb first */ 041 for (i = 31 ; i >= 0 ; i--) 066 for (i = 31 ; i >= 0 ; i--) 042 { 067 { 043 /* Test if bit i of 'integer' is set */ 068 /* Test if bit i of 'integer' is set */ 044 int bit_i = (integer & (1 << i)); 069 int bit_i = (integer & (1 << i)); 045 /* Ascii 219 => dark carret, Ascii 177 = 070 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 046 unsigned char ascii_code = bit_i?219:177 071 unsigned char ascii_code = bit_i?219:177; 047 sos_x86_videomem_putchar(row, col++, 072 sos_x86_videomem_putchar(row, col++, 048 attribute, 073 attribute, 049 ascii_code); 074 ascii_code); 050 } 075 } 051 } 076 } 052 077 053 << 054 /* Clock IRQ handler */ 078 /* Clock IRQ handler */ 055 static void clk_it(int intid) 079 static void clk_it(int intid) 056 { 080 { 057 static sos_ui32_t clock_count = 0; 081 static sos_ui32_t clock_count = 0; 058 082 059 display_bits(0, 48, 083 display_bits(0, 48, 060 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 084 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 061 clock_count); 085 clock_count); 062 clock_count++; 086 clock_count++; 063 087 >> 088 /* Execute the expired timeout actions (if any) */ >> 089 sos_time_do_tick(); >> 090 >> 091 /* Update scheduler statistics and status */ >> 092 sos_sched_do_timer_tick(); 064 } 093 } 065 094 066 /* Division by zero exception handler */ !! 095 067 static void divide_ex(int exid) !! 096 /* ====================================================================== >> 097 * Page fault exception handling >> 098 */ >> 099 >> 100 >> 101 /* Page fault exception handler with demand paging for the kernel */ >> 102 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 068 { 103 { 069 static sos_ui32_t div_count = 0; !! 104 static sos_ui32_t demand_paging_count = 0; >> 105 struct sos_thread * cur_thr = sos_thread_get_current(); >> 106 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); >> 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_EX_info(ctxt); >> 115 >> 116 /* Make sure to always stay in the interrupted thread's MMU >> 117 configuration */ >> 118 need_to_setup_mmu = (cur_thr->squatted_mm_context >> 119 != sos_process_get_mm_context(cur_thr->process)); >> 120 if (need_to_setup_mmu) >> 121 sos_thread_prepare_user_space_access(NULL, 0); >> 122 >> 123 if (SOS_OK == >> 124 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, >> 125 errcode & (1 << 1), >> 126 TRUE)) >> 127 goto unforce_address_space; >> 128 >> 129 /* If the page fault occured in kernel mode, return to kernel to >> 130 the fixup address */ >> 131 if (! sos_cpu_context_is_in_user_mode(ctxt)) >> 132 { >> 133 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; >> 134 sos_cpu_context_set_EX_return_address(ctxt, >> 135 cur_thr->fixup_uaccess.return_vaddr); >> 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: Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\e[m\n", >> 143 (void*)sos_thread_get_current(), >> 144 sos_cpu_context_get_PC(ctxt), >> 145 (unsigned)faulting_vaddr, >> 146 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 147 sos_bochs_printf("Terminating User thread\n"); >> 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 range */ >> 157 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) >> 158 { >> 159 /* No: The page fault is out of any kernel virtual region. For >> 160 the moment, we don't handle this. */ >> 161 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", >> 162 sos_cpu_context_get_PC(ctxt), >> 163 (unsigned)faulting_vaddr, >> 164 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 165 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); >> 166 } >> 167 >> 168 >> 169 /* >> 170 * Demand paging in kernel space >> 171 */ >> 172 >> 173 /* Update the number of demand paging requests handled */ >> 174 demand_paging_count ++; 070 display_bits(0, 0, 175 display_bits(0, 0, 071 SOS_X86_VIDEO_FG_LTRED | SOS_X8 176 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 072 div_count); !! 177 demand_paging_count); 073 div_count++; !! 178 >> 179 /* Allocate a new page for the virtual address */ >> 180 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); >> 181 if (! ppage_paddr) >> 182 SOS_ASSERT_FATAL(! "TODO: implement swap. (Out of mem in demand paging because no swap for kernel yet !)"); >> 183 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, >> 184 SOS_PAGE_ALIGN_INF(faulting_vaddr), >> 185 FALSE, >> 186 SOS_VM_MAP_PROT_READ >> 187 | SOS_VM_MAP_PROT_WRITE >> 188 | SOS_VM_MAP_ATOMIC)); >> 189 sos_physmem_unref_physpage(ppage_paddr); >> 190 >> 191 /* Ok, we can now return to interrupted context */ >> 192 } >> 193 >> 194 >> 195 >> 196 /* ====================================================================== >> 197 * An operating system MUST always have a ready thread ! Otherwise: >> 198 * what would the CPU have to execute ?! >> 199 */ >> 200 static void idle_thread(void* unused) __attribute__((noreturn)); >> 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 "Invalid opcode" CPU >> 208 exception (old 80386 CPU) */ >> 209 asm("hlt\n"); >> 210 >> 211 idle_twiddle ++; >> 212 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, >> 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 statistics on the console every 1s >> 223 */ >> 224 #define LOAD_DISPLAY_BASELINE 4 >> 225 #define LOAD_DISPLAY_STARTROW 34 >> 226 static void stat_thread(void * unused) __attribute__((noreturn)); >> 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 following computation */ >> 243 sos_load_get_sload(&load1, &load5, &load15); >> 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_BASELINE+0, LOAD_DISPLAY_STARTROW, >> 248 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 249 "Kernel (- Idle): %s %s %s ", >> 250 str1, str5, str15); >> 251 >> 252 sos_load_get_uload(&load1, &load5, &load15); >> 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_BASELINE+1, LOAD_DISPLAY_STARTROW, >> 257 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 258 "User: %s %s %s ", >> 259 str1, str5, str15); >> 260 >> 261 sos_load_get_uratio(&load1, &load5, &load15); >> 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_BASELINE+2, LOAD_DISPLAY_STARTROW, >> 266 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 267 "User CPU %%: %s %s %s ", >> 268 str1, str5, str15); >> 269 >> 270 /* The IDLE task is INcluded in the following computation */ >> 271 sos_load_get_sratio(&load1, &load5, &load15); >> 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_BASELINE+3, LOAD_DISPLAY_STARTROW, >> 276 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 277 "Kernel CPU %% (+ Idle): %s %s %s ", >> 278 str1, str5, str15); >> 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 * rootfs) >> 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, * init_cwd, * unused_of; >> 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_init); >> 302 >> 303 >> 304 /* >> 305 * Setup the root and CWD directories of the process. The root of >> 306 * this process will correspond to the "global" root of the whole >> 307 * system since all the future processes will duplicate it ! >> 308 */ >> 309 retval = sos_fs_new_opened_file(proc_init, rootfs->root, >> 310 SOS_FS_OPEN_READ | SOS_FS_OPEN_WRITE, >> 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 current working directory of >> 319 the init process */ >> 320 retval = sos_fs_duplicate_opened_file(init_root, proc_init, >> 321 & init_cwd); >> 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_init, init_root, & unused_of) ) >> 331 || ( SOS_OK != sos_process_chdir(proc_init, init_cwd, & unused_of) ) ) >> 332 { >> 333 sos_fs_close(init_root); >> 334 sos_fs_close(init_cwd); >> 335 sos_process_chroot(proc_init, NULL, & unused_of); >> 336 sos_process_chdir(proc_init, NULL, & unused_of); >> 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, "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_DEFAULT_USER_STACK_SIZE) + 1; >> 353 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, >> 354 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, >> 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 + SOS_DEFAULT_USER_STACK_SIZE - 4, >> 368 SOS_SCHED_PRIO_TS_LOWEST); >> 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; 074 } 377 } 075 378 076 /* The C entry point of our operating system * !! 379 077 void sos_main(unsigned long magic, unsigned lo !! 380 >> 381 /* ====================================================================== >> 382 * The C entry point of our operating system >> 383 */ >> 384 void sos_main(unsigned long magic, unsigned long arg) >> 385 __attribute__((noreturn)); >> 386 void sos_main(unsigned long magic, unsigned long arg) 078 { 387 { 079 unsigned i; !! 388 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; >> 389 struct sos_time tick_resolution; >> 390 struct sos_fs_manager_instance * rootfs; 080 391 081 /* Grub sends us a structure, called multibo !! 392 /* Size of RAM above 1MB. Might be undefined ! */ 082 precious informations about the system, s !! 393 unsigned long int upper_mem = 0; 083 documentation for more information. */ << 084 multiboot_info_t *mbi; << 085 mbi = (multiboot_info_t *) addr; << 086 394 087 /* Setup bochs and console, and clear the co 395 /* Setup bochs and console, and clear the console */ 088 sos_bochs_setup(); !! 396 sos_bochs_subsystem_setup(); 089 397 090 sos_x86_videomem_setup(); 398 sos_x86_videomem_setup(); 091 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 399 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 092 400 093 /* Greetings from SOS */ 401 /* Greetings from SOS */ 094 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 402 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 095 /* Loaded with Grub */ !! 403 { 096 sos_x86_videomem_printf(1, 0, !! 404 /* Grub sends us a structure, called multiboot_info_t with a lot of 097 SOS_X86_VIDEO_FG_Y !! 405 precious informations about the system, see the multiboot 098 "Welcome From GRUB !! 406 documentation for more information. */ 099 "SOS", ',', !! 407 multiboot_info_t *mbi = (multiboot_info_t *) arg; 100 (unsigned)(mbi->me !! 408 101 (unsigned)mbi->mem !! 409 /* Multiboot says: "The value returned for upper memory is >> 410 maximally the address of the first upper memory hole minus 1 >> 411 megabyte.". It also adds: "It is not guaranteed to be this >> 412 value." aka "YMMV" ;) */ >> 413 upper_mem = mbi->mem_upper; >> 414 sos_x86_videomem_printf(1, 0, >> 415 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 416 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 417 "SOS article 9.5", ',', >> 418 (unsigned)(upper_mem >> 10) + 1, >> 419 (unsigned)upper_mem); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 427 "Welcome to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 428 "SOS article 9.5", ',', >> 429 (unsigned)(upper_mem >> 10) + 1, >> 430 (unsigned)upper_mem); >> 431 } 102 else 432 else 103 /* Not loaded with grub */ !! 433 /* Not loaded with grub, not from an enhanced bootsect */ 104 sos_x86_videomem_printf(1, 0, 434 sos_x86_videomem_printf(1, 0, 105 SOS_X86_VIDEO_FG_Y 435 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 106 "Welcome to SOS"); !! 436 "Welcome to SOS article 9.5"); 107 437 108 sos_bochs_putstring("Message in a bochs\n"); !! 438 sos_bochs_putstring("Message in a bochs: This is SOS article 9.5.\n"); 109 439 110 /* Setup CPU segmentation and IRQ subsystem 440 /* Setup CPU segmentation and IRQ subsystem */ 111 sos_gdt_setup(); !! 441 sos_gdt_subsystem_setup(); 112 sos_idt_setup(); !! 442 sos_idt_subsystem_setup(); 113 443 114 /* Setup SOS IRQs and exceptions subsystem * 444 /* Setup SOS IRQs and exceptions subsystem */ 115 sos_exceptions_setup(); !! 445 sos_exception_subsystem_setup(); 116 sos_irq_setup(); !! 446 sos_irq_subsystem_setup(); 117 447 118 /* Configure the timer so as to raise the IR 448 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 119 sos_i8254_set_frequency(100); 449 sos_i8254_set_frequency(100); 120 450 >> 451 /* Setup the kernel time subsystem to get prepared to take the timer >> 452 ticks into account */ >> 453 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; >> 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_FG_LTRED >> 461 | SOS_X86_VIDEO_BG_BLUE >> 462 | SOS_X86_VIDEO_FG_BLINKING, >> 463 "I don't know RAM size ! Load me with Grub..."); >> 464 /* STOP ! */ >> 465 for (;;) >> 466 continue; >> 467 } >> 468 >> 469 /* >> 470 * Some interrupt handlers >> 471 */ >> 472 121 /* Binding some HW interrupts and exceptions 473 /* Binding some HW interrupts and exceptions to software routines */ 122 sos_irq_set_routine(SOS_IRQ_TIMER, 474 sos_irq_set_routine(SOS_IRQ_TIMER, 123 clk_it); !! 475 clk_it); 124 sos_exception_set_routine(SOS_EXCEPT_DIVIDE_ !! 476 125 divide_ex); !! 477 /* >> 478 * Setup physical memory management >> 479 */ >> 480 >> 481 SOS_ASSERT_FATAL(SOS_OK >> 482 == sos_physmem_subsystem_setup((upper_mem<<10) + (1<<20), >> 483 &sos_kernel_core_base_paddr, >> 484 &sos_kernel_core_top_paddr)); >> 485 >> 486 /* >> 487 * Switch to paged-memory mode >> 488 */ >> 489 >> 490 /* Disabling interrupts should seem more correct, but it's not really >> 491 necessary at this stage */ >> 492 SOS_ASSERT_FATAL(SOS_OK == >> 493 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, >> 494 sos_kernel_core_top_paddr)); >> 495 >> 496 /* Bind the page fault exception */ >> 497 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, >> 498 pgflt_ex); >> 499 >> 500 /* >> 501 * Setup kernel virtual memory allocator >> 502 */ >> 503 >> 504 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, >> 505 sos_kernel_core_top_paddr, >> 506 bootstrap_stack_bottom, >> 507 bootstrap_stack_bottom >> 508 + bootstrap_stack_size)) >> 509 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); >> 510 >> 511 if (sos_kmalloc_subsystem_setup()) >> 512 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); >> 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 interrupt handler >> 526 */ >> 527 sos_swintr_subsystem_setup(); >> 528 >> 529 >> 530 /* >> 531 * Initialize the Kernel thread and scheduler subsystems >> 532 */ >> 533 >> 534 /* Initialize kernel thread subsystem */ >> 535 sos_thread_subsystem_setup(bootstrap_stack_bottom, >> 536 bootstrap_stack_size); >> 537 >> 538 /* Initialize the scheduler */ >> 539 sos_sched_subsystem_setup(); >> 540 >> 541 /* Declare the IDLE thread */ >> 542 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, >> 543 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 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("stat_thread", stat_thread, >> 550 NULL, >> 551 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 552 >> 553 >> 554 /* >> 555 * Initialise user address space management subsystem >> 556 */ >> 557 sos_umem_vmm_subsystem_setup(); >> 558 sos_dev_zero_subsystem_setup(); >> 559 >> 560 /* Initialize the page and block cache subsystems */ >> 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 >> 570 126 /* Enabling the HW interrupts here, this wil 571 /* Enabling the HW interrupts here, this will make the timer HW 127 interrupt call our clk_it handler */ !! 572 interrupt call the scheduler */ 128 asm volatile ("sti\n"); 573 asm volatile ("sti\n"); 129 574 130 /* 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 } << 141 575 142 /* Will never print this since the "divide b !! 576 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_subsystem_setup()); 143 returns to the faulting instruction (see !! 577 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_setup(NULL, 144 section 5.12), thus re-evaluating the "di !! 578 "virtfs", 145 and raising the "divide by zero" exceptio !! 579 NULL, 146 sos_x86_videomem_putstring(2, 0, !! 580 & rootfs)); 147 SOS_X86_VIDEO_FG_ !! 581 148 "Invisible"); !! 582 >> 583 tty_subsystem_setup(); >> 584 sos_ttyS0_subsystem_setup(); >> 585 sos_console_subsystem_setup(); >> 586 >> 587 >> 588 sos_ide_subsystem_setup(); >> 589 >> 590 149 591 150 return; !! 592 /* Start the 'init' process, which in turns launches the other >> 593 programs */ >> 594 start_init(rootfs); >> 595 /* >> 596 * We can safely exit from this function now, for there is already >> 597 * an idle Kernel thread ready to make the CPU busy working... >> 598 * >> 599 * However, we must EXPLICITELY call sos_thread_exit() because a >> 600 * simple "return" will return nowhere ! Actually this first thread >> 601 * was initialized by the Grub bootstrap stage, at a time when the >> 602 * word "thread" did not exist. This means that the stack was not >> 603 * setup in order for a return here to call sos_thread_exit() >> 604 * automagically. Hence we must call it manually. This is the ONLY >> 605 * kernel thread where we must do this manually. >> 606 */ >> 607 sos_bochs_printf("Bye from primary thread !\n"); >> 608 sos_thread_exit(); >> 609 SOS_FATAL_ERROR("No trespassing !"); 151 } 610 }
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