Diff markup
001 001
002 <<
003 002
004 003
005 004
006 005
007 006
008 007
009 008
010 009
011 010
012 011
013 012
014 013
015 014
016 015
017 016
018 017
019 018
>> 019 #include <sos/errno.h>
>> 020
020 021
021 #include <bootstrap/multiboot.h> 022 #include <bootstrap/multiboot.h>
>> 023 #include <hwcore/idt.h>
>> 024 #include <hwcore/gdt.h>
>> 025 #include <hwcore/irq.h>
>> 026 #include <hwcore/exception.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>
022 #include <sos/klibc.h> 039 #include <sos/klibc.h>
023 #include <sos/assert.h> 040 #include <sos/assert.h>
024 #include <drivers/x86_videomem.h> 041 #include <drivers/x86_videomem.h>
025 #include <drivers/bochs.h> 042 #include <drivers/bochs.h>
>> 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
>> 055
>> 056
>> 057 void display_bits(unsigned char row, unsigned char col,
>> 058 unsigned char attribute,
>> 059 sos_ui32_t integer)
>> 060 {
>> 061 int i;
>> 062
>> 063 for (i = 31 ; i >= 0 ; i--)
>> 064 {
>> 065
>> 066 int bit_i = (integer & (1 << i));
>> 067
>> 068 unsigned char ascii_code = bit_i?219:177;
>> 069 sos_x86_videomem_putchar(row, col++,
>> 070 attribute,
>> 071 ascii_code);
>> 072 }
>> 073 }
>> 074
>> 075
>> 076 static void clk_it(int intid)
>> 077 {
>> 078 static sos_ui32_t clock_count = 0;
>> 079
>> 080 display_bits(0, 48,
>> 081 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE,
>> 082 clock_count);
>> 083 clock_count++;
026 084
>> 085
>> 086 sos_time_do_tick();
027 087
>> 088
>> 089 sos_sched_do_timer_tick();
>> 090 }
028 091
029 !! 092
030 void sos_main(unsigned long magic, unsigned lo !! 093
>> 094
>> 095
>> 096
>> 097
>> 098
>> 099 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt)
>> 100 {
>> 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
>> 114
>> 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
>> 127
>> 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
>> 153 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr))
>> 154 {
>> 155
>> 156
>> 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
>> 167
>> 168
>> 169
>> 170 demand_paging_count ++;
>> 171 display_bits(0, 0,
>> 172 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE,
>> 173 demand_paging_count);
>> 174
>> 175
>> 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
>> 188 }
>> 189
>> 190
>> 191
>> 192
>> 193
>> 194
>> 195
>> 196 static void idle_thread()
>> 197 {
>> 198 sos_ui32_t idle_twiddle = 0;
>> 199
>> 200 while (1)
>> 201 {
>> 202
>> 203
>> 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
>> 211 sos_thread_yield();
>> 212 }
>> 213 }
>> 214
>> 215
>> 216
>> 217
>> 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
>> 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
>> 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
>> 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
>> 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
>> 300
>> 301
>> 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
>> 313
>> 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
>> 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
>> 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
>> 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 0);
>> 350 if (SOS_OK != retval)
>> 351 {
>> 352 sos_process_unref(proc_init);
>> 353 return -SOS_ENOMEM;
>> 354 }
>> 355
>> 356
>> 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;
>> 371 }
>> 372
>> 373
>> 374
>> 375
>> 376
>> 377 void sos_main(unsigned long magic, unsigned long arg)
031 { 378 {
032 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;
033 383
034 !! 384
035 !! 385 unsigned long int upper_mem = 0;
036 <<
037 multiboot_info_t *mbi; <<
038 mbi = (multiboot_info_t *) addr; <<
039 386
040 387
041 sos_bochs_setup(); !! 388 sos_bochs_subsystem_setup();
042 389
043 sos_x86_videomem_setup(); 390 sos_x86_videomem_setup();
044 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 391 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE);
045 392
046 393
047 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 394 if (magic == MULTIBOOT_BOOTLOADER_MAGIC)
048 !! 395 {
049 sos_x86_videomem_printf(1, 0, !! 396
050 SOS_X86_VIDEO_FG_Y !! 397
051 "Welcome From GRUB !! 398
052 "SOS", ',', !! 399 multiboot_info_t *mbi = (multiboot_info_t *) arg;
053 (unsigned)(mbi->me !! 400
054 (unsigned)mbi->mem !! 401
>> 402
>> 403
>> 404
>> 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
>> 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 }
055 else 424 else
056 !! 425
057 sos_x86_videomem_printf(1, 0, 426 sos_x86_videomem_printf(1, 0,
058 SOS_X86_VIDEO_FG_Y 427 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE,
059 "Welcome to SOS"); !! 428 "Welcome to SOS article 9");
060 <<
061 sos_bochs_putstring("Message in a bochs\n"); <<
062 <<
063 429
064 !! 430 sos_bochs_putstring("Message in a bochs: This is SOS article 9.\n");
065 for (;;) <<
066 continue; <<
067 431
068 return; !! 432
>> 433 sos_gdt_subsystem_setup();
>> 434 sos_idt_subsystem_setup();
>> 435
>> 436
>> 437 sos_exception_subsystem_setup();
>> 438 sos_irq_subsystem_setup();
>> 439
>> 440
>> 441 sos_i8254_set_frequency(100);
>> 442
>> 443
>> 444
>> 445 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL };
>> 446 sos_time_subsysem_setup(& tick_resolution);
>> 447
>> 448
>> 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
>> 457 for (;;)
>> 458 continue;
>> 459 }
>> 460
>> 461
>> 462
>> 463
>> 464
>> 465
>> 466 sos_irq_set_routine(SOS_IRQ_TIMER,
>> 467 clk_it);
>> 468
>> 469
>> 470
>> 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
>> 480
>> 481
>> 482
>> 483
>> 484 SOS_ASSERT_FATAL(SOS_OK ==
>> 485 sos_paging_subsystem_setup(sos_kernel_core_base_paddr,
>> 486 sos_kernel_core_top_paddr));
>> 487
>> 488
>> 489 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT,
>> 490 pgflt_ex);
>> 491
>> 492
>> 493
>> 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
>> 508
>> 509 sos_mm_context_subsystem_setup();
>> 510
>> 511
>> 512
>> 513
>> 514 sos_cpu_context_subsystem_setup();
>> 515
>> 516
>> 517
>> 518
>> 519 sos_swintr_subsystem_setup();
>> 520
>> 521
>> 522
>> 523
>> 524
>> 525
>> 526
>> 527 sos_thread_subsystem_setup(bootstrap_stack_bottom,
>> 528 bootstrap_stack_size);
>> 529
>> 530
>> 531 sos_sched_subsystem_setup();
>> 532
>> 533
>> 534 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL,
>> 535 SOS_SCHED_PRIO_TS_LOWEST) != NULL);
>> 536
>> 537
>> 538 sos_load_subsystem_setup();
>> 539
>> 540
>> 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
>> 548
>> 549 sos_umem_vmm_subsystem_setup();
>> 550 sos_dev_zero_subsystem_setup();
>> 551 sos_dev_mem_chardev_setup();
>> 552
>> 553
>> 554
>> 555
>> 556 sos_process_subsystem_setup();
>> 557
>> 558
>> 559
>> 560
>> 561 asm volatile ("sti\n");
>> 562
>> 563
>> 564 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_subsystem_setup());
>> 565 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_setup(NULL,
>> 566 "virtfs",
>> 567 NULL,
>> 568 & rootfs));
>> 569
>> 570
>> 571 tty_subsystem_setup();
>> 572 sos_ttyS0_subsystem_setup();
>> 573 sos_console_subsystem_setup();
>> 574
>> 575
>> 576
>> 577
>> 578
>> 579
>> 580 start_init(rootfs);
>> 581
>> 582
>> 583
>> 584
>> 585
>> 586
>> 587
>> 588
>> 589
>> 590
>> 591
>> 592
>> 593 sos_bochs_printf("Bye from primary thread !\n");
>> 594 sos_thread_exit();
>> 595 SOS_FATAL_ERROR("No trespassing !");
069 } 596 }