Navigation
- Accueil
- Présentation :
- FAQ
- Bugs et errata
- Contributions de lecteurs
- Téléchargements
- LXR (référencement des sources)
- Mailing-list
- Liens et Projets reliés
Site hébergé par :
Site hébergé par :
|
[ source navigation ] [ diff markup ] [ identifier search ] [ general search ] |
|||
|
||||
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> 027 #include <sos/list.h> 029 #include <sos/physmem.h> 028 #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> 029 #include <sos/klibc.h> 040 #include <sos/assert.h> 030 #include <sos/assert.h> 041 #include <drivers/x86_videomem.h> 031 #include <drivers/x86_videomem.h> 042 #include <drivers/bochs.h> 032 #include <drivers/bochs.h> 043 #include <sos/calcload.h> !! 033 044 #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> << 049 034 050 /* Helper function to display each bits of a 3 035 /* Helper function to display each bits of a 32bits integer on the 051 screen as dark or light carrets */ 036 screen as dark or light carrets */ 052 void display_bits(unsigned char row, unsigned !! 037 static void display_bits(unsigned char row, unsigned char col, 053 unsigned char attribute, !! 038 unsigned char attribute, 054 sos_ui32_t integer) !! 039 sos_ui32_t integer) 055 { 040 { 056 int i; 041 int i; 057 /* Scan each bit of the integer, MSb first * 042 /* Scan each bit of the integer, MSb first */ 058 for (i = 31 ; i >= 0 ; i--) 043 for (i = 31 ; i >= 0 ; i--) 059 { 044 { 060 /* Test if bit i of 'integer' is set */ 045 /* Test if bit i of 'integer' is set */ 061 int bit_i = (integer & (1 << i)); 046 int bit_i = (integer & (1 << i)); 062 /* Ascii 219 => dark carret, Ascii 177 = 047 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 063 unsigned char ascii_code = bit_i?219:177 048 unsigned char ascii_code = bit_i?219:177; 064 sos_x86_videomem_putchar(row, col++, 049 sos_x86_videomem_putchar(row, col++, 065 attribute, 050 attribute, 066 ascii_code); 051 ascii_code); 067 } 052 } 068 } 053 } 069 054 >> 055 070 /* Clock IRQ handler */ 056 /* Clock IRQ handler */ 071 static void clk_it(int intid) 057 static void clk_it(int intid) 072 { 058 { 073 static sos_ui32_t clock_count = 0; 059 static sos_ui32_t clock_count = 0; 074 060 075 display_bits(0, 48, 061 display_bits(0, 48, 076 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 062 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 077 clock_count); 063 clock_count); 078 clock_count++; 064 clock_count++; 079 065 080 /* Execute the expired timeout actions (if a << 081 sos_time_do_tick(); << 082 << 083 /* Update scheduler statistics and status */ << 084 sos_sched_do_timer_tick(); << 085 } 066 } 086 067 087 !! 068 #define MY_PPAGE_NUM_INT 511 088 /* =========================================== !! 069 struct my_ppage 089 * Page fault exception handling << 090 */ << 091 << 092 << 093 /* Page fault exception handler with demand pa << 094 static void pgflt_ex(int intid, struct sos_cpu << 095 { 070 { 096 static sos_ui32_t demand_paging_count = 0; !! 071 sos_ui32_t before[MY_PPAGE_NUM_INT]; 097 struct sos_thread * cur_thr = sos_thread_get !! 072 struct my_ppage *prev, *next; 098 sos_vaddr_t faulting_vaddr = sos_cpu_contex !! 073 sos_ui32_t after[MY_PPAGE_NUM_INT]; 099 sos_paddr_t ppage_paddr; !! 074 }; /* sizeof() Must be <= 4kB */ 100 !! 075 101 if (sos_cpu_context_is_in_user_mode(ctxt) !! 076 static void test_physmem() 102 || (cur_thr->fixup_uaccess.return_vaddr) !! 077 { >> 078 /* We place the pages we did allocate here */ >> 079 struct my_ppage *ppage_list, *my_ppage; >> 080 sos_count_t num_alloc_ppages = 0, num_free_ppages = 0; >> 081 >> 082 ppage_list = NULL; >> 083 while ((my_ppage = (struct my_ppage*)sos_physmem_ref_physpage_new(FALSE)) >> 084 != NULL) 103 { 085 { 104 __label__ unforce_address_space; !! 086 int i; 105 sos_bool_t need_to_setup_mmu; !! 087 num_alloc_ppages++; 106 sos_ui32_t errcode = sos_cpu_context_get !! 088 107 !! 089 /* Print the allocation status */ 108 /* Make sure to always stay in the inter !! 090 sos_x86_videomem_printf(2, 0, 109 configuration */ !! 091 SOS_X86_VIDEO_FG_YELLOW 110 need_to_setup_mmu = (cur_thr->squatted_m !! 092 | SOS_X86_VIDEO_BG_BLUE, 111 != sos_process_get_ !! 093 "Could allocate %d pages ", 112 if (need_to_setup_mmu) !! 094 num_alloc_ppages); 113 sos_thread_prepare_user_space_access(N !! 095 114 !! 096 /* We fill this page with its address */ 115 if (SOS_OK == !! 097 for (i = 0 ; i < MY_PPAGE_NUM_INT ; i++) 116 sos_umem_vmm_try_resolve_page_fault( !! 098 my_ppage->before[i] = my_ppage->after[i] = (sos_ui32_t)my_ppage; 117 !! 099 118 !! 100 /* We add this page at the tail of our list of ppages */ 119 goto unforce_address_space; !! 101 list_add_tail(ppage_list, my_ppage); 120 !! 102 } 121 /* If the page fault occured in kernel m !! 103 122 the fixup address */ !! 104 /* Now we release these pages in FIFO order */ 123 if (! sos_cpu_context_is_in_user_mode(ct !! 105 while ((my_ppage = list_pop_head(ppage_list)) != NULL) >> 106 { >> 107 /* We make sure this page was not overwritten by any unexpected >> 108 value */ >> 109 int i; >> 110 for (i = 0 ; i < MY_PPAGE_NUM_INT ; i++) 124 { 111 { 125 cur_thr->fixup_uaccess.faulted_uaddr !! 112 /* We don't get what we expect ! */ 126 sos_cpu_context_set_EX_return_addres !! 113 if ((my_ppage->before[i] != (sos_ui32_t)my_ppage) 127 !! 114 || (my_ppage->after[i] != (sos_ui32_t)my_ppage)) 128 goto unforce_address_space; !! 115 { >> 116 /* STOP ! */ >> 117 sos_x86_videomem_putstring(20, 0, >> 118 SOS_X86_VIDEO_FG_LTRED >> 119 | SOS_X86_VIDEO_BG_BLUE, >> 120 "Page overwritten"); >> 121 return; >> 122 } 129 } 123 } 130 124 131 if (need_to_setup_mmu) !! 125 /* Release the descriptor */ 132 sos_thread_end_user_space_access(); !! 126 if (sos_physmem_unref_physpage((sos_paddr_t)my_ppage) < 0) 133 !! 127 { 134 sos_bochs_printf("Unresolved USER page F !! 128 /* STOP ! */ 135 sos_cpu_context_get_PC( !! 129 sos_x86_videomem_putstring(20, 0, 136 (unsigned)faulting_vadd !! 130 SOS_X86_VIDEO_FG_LTRED 137 (unsigned)sos_cpu_conte !! 131 | SOS_X86_VIDEO_BG_BLUE, 138 sos_bochs_printf("Terminating User threa !! 132 "Cannot release page"); 139 sos_thread_exit(); !! 133 return; 140 !! 134 } 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 ra << 148 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v << 149 { << 150 /* No: The page fault is out of any kern << 151 the moment, we don't handle this. */ << 152 sos_display_fatal_error("Unresolved page << 153 sos_cpu_context_ << 154 (unsigned)faulti << 155 (unsigned)sos_cp << 156 SOS_ASSERT_FATAL(! "Got page fault (note << 157 } << 158 << 159 << 160 /* << 161 * Demand paging in kernel space << 162 */ << 163 << 164 /* Update the number of demand paging reques << 165 demand_paging_count ++; << 166 display_bits(0, 0, << 167 SOS_X86_VIDEO_FG_LTRED | SOS_X8 << 168 demand_paging_count); << 169 << 170 /* Allocate a new page for the virtual addre << 171 ppage_paddr = sos_physmem_ref_physpage_new(F << 172 if (! ppage_paddr) << 173 SOS_ASSERT_FATAL(! "TODO: implement swap. << 174 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp << 175 SO << 176 FA << 177 SO << 178 | << 179 | << 180 sos_physmem_unref_physpage(ppage_paddr); << 181 << 182 /* Ok, we can now return to interrupted cont << 183 } << 184 << 185 << 186 << 187 /* =========================================== << 188 * An operating system MUST always have a read << 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 << 198 exception (old 80386 CPU) */ << 199 asm("hlt\n"); << 200 << 201 idle_twiddle ++; << 202 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE << 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 statis << 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 foll << 230 sos_load_get_sload(&load1, &load5, &load << 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 << 236 "Kernel (- Idle) << 237 str1, str5, str1 << 238 << 239 sos_load_get_uload(&load1, &load5, &load << 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 << 245 "User: %s %s %s << 246 str1, str5, str1 << 247 << 248 sos_load_get_uratio(&load1, &load5, &loa << 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 << 254 "User CPU %%: %s << 255 str1, str5, str1 << 256 << 257 /* The IDLE task is INcluded in the foll << 258 sos_load_get_sratio(&load1, &load5, &loa << 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 << 264 "Kernel CPU %% ( << 265 str1, str5, str1 << 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 * ro << 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, * ini << 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 << 289 << 290 << 291 /* << 292 * Setup the root and CWD directories of the << 293 * this process will correspond to the "glob << 294 * system since all the future processes wil << 295 */ << 296 retval = sos_fs_new_opened_file(proc_init, r << 297 SOS_FS_OPEN_ << 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 curren << 306 the init process */ << 307 retval = sos_fs_duplicate_opened_file(init_r << 308 & init << 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_ini << 318 || ( SOS_OK != sos_process_chdir(proc_i << 319 { << 320 sos_fs_close(init_root); << 321 sos_fs_close(init_cwd); << 322 sos_process_chroot(proc_init, NULL, & un << 323 sos_process_chdir(proc_init, NULL, & unu << 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, << 330 if (0 == start_uaddr) << 331 { << 332 sos_process_unref(proc_init); << 333 return -SOS_ENOENT; << 334 } << 335 135 336 /* Allocate the user stack */ !! 136 /* Print the deallocation status */ 337 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ !! 137 num_free_ppages ++; 338 retval = sos_dev_zero_map(as_init, &ustack, !! 138 sos_x86_videomem_printf(2, 0, 339 SOS_VM_MAP_PROT_RE !! 139 SOS_X86_VIDEO_FG_YELLOW 340 /* PRIVATE */ 0); !! 140 | SOS_X86_VIDEO_BG_BLUE, 341 if (SOS_OK != retval) !! 141 "Could free %d pages ", 342 { !! 142 num_free_ppages); 343 sos_process_unref(proc_init); << 344 return -SOS_ENOMEM; << 345 } 143 } 346 144 347 /* Now create the user thread */ !! 145 /* Print the overall stats */ 348 new_thr = sos_create_user_thread(NULL, !! 146 sos_x86_videomem_printf(2, 0, 349 proc_init, !! 147 SOS_X86_VIDEO_FG_LTGREEN 350 start_uaddr !! 148 | SOS_X86_VIDEO_BG_BLUE, 351 0, 0, !! 149 "Could allocate %d bytes, could free %d bytes ", 352 ustack + SO !! 150 num_alloc_ppages << SOS_PAGE_SHIFT, 353 SOS_SCHED_P !! 151 num_free_ppages << SOS_PAGE_SHIFT); 354 if (! new_thr) << 355 { << 356 sos_process_unref(proc_init); << 357 return -SOS_ENOMEM; << 358 } << 359 152 360 sos_process_unref(proc_init); !! 153 SOS_ASSERT_FATAL(num_alloc_ppages == num_free_ppages); 361 return SOS_OK; << 362 } 154 } 363 155 364 156 365 /* =========================================== !! 157 /* The C entry point of our operating system */ 366 * The C entry point of our operating system !! 158 void sos_main(unsigned long magic, unsigned long addr) 367 */ << 368 void sos_main(unsigned long magic, unsigned lo << 369 { 159 { 370 unsigned i; 160 unsigned i; 371 sos_paddr_t sos_kernel_core_base_paddr, sos_ 161 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; << 374 162 375 /* Size of RAM above 1MB. Might be undefined !! 163 /* Grub sends us a structure, called multiboot_info_t with a lot of 376 unsigned long int upper_mem = 0; !! 164 precious informations about the system, see the multiboot >> 165 documentation for more information. */ >> 166 multiboot_info_t *mbi; >> 167 mbi = (multiboot_info_t *) addr; 377 168 378 /* Setup bochs and console, and clear the co 169 /* Setup bochs and console, and clear the console */ 379 sos_bochs_setup(); 170 sos_bochs_setup(); 380 171 381 sos_x86_videomem_setup(); 172 sos_x86_videomem_setup(); 382 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 173 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 383 174 384 /* Greetings from SOS */ 175 /* Greetings from SOS */ 385 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 176 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 386 { !! 177 /* Loaded with Grub */ 387 /* Grub sends us a structure, called mul !! 178 sos_x86_videomem_printf(1, 0, 388 precious informations about the syste !! 179 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 389 documentation for more information. * !! 180 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 390 multiboot_info_t *mbi = (multiboot_info_ !! 181 "SOS", ',', 391 !! 182 (unsigned)(mbi->mem_upper >> 10) + 1, 392 /* Multiboot says: "The value returned f !! 183 (unsigned)mbi->mem_upper); 393 maximally the address of the first up << 394 megabyte.". It also adds: "It is not << 395 value." aka "YMMV" ;) */ << 396 upper_mem = mbi->mem_upper; << 397 sos_x86_videomem_printf(1, 0, << 398 SOS_X86_VIDEO_FG << 399 "Welcome From GR << 400 "SOS article 8", << 401 (unsigned)(upper << 402 (unsigned)upper_ << 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 << 410 "Welcome to %s%c << 411 "SOS article 8", << 412 (unsigned)(upper << 413 (unsigned)upper_ << 414 } << 415 else 184 else 416 /* Not loaded with grub, not from an enhan !! 185 /* Not loaded with grub */ 417 sos_x86_videomem_printf(1, 0, 186 sos_x86_videomem_printf(1, 0, 418 SOS_X86_VIDEO_FG_Y 187 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 419 "Welcome to SOS ar !! 188 "Welcome to SOS"); 420 189 421 sos_bochs_putstring("Message in a bochs: Thi !! 190 sos_bochs_putstring("Message in a bochs\n"); 422 191 423 /* Setup CPU segmentation and IRQ subsystem 192 /* Setup CPU segmentation and IRQ subsystem */ 424 sos_gdt_subsystem_setup(); !! 193 sos_gdt_setup(); 425 sos_idt_subsystem_setup(); !! 194 sos_idt_setup(); 426 195 427 /* Setup SOS IRQs and exceptions subsystem * 196 /* Setup SOS IRQs and exceptions subsystem */ 428 sos_exception_subsystem_setup(); !! 197 sos_exceptions_setup(); 429 sos_irq_subsystem_setup(); !! 198 sos_irq_setup(); 430 199 431 /* Configure the timer so as to raise the IR 200 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 432 sos_i8254_set_frequency(100); 201 sos_i8254_set_frequency(100); 433 202 434 /* Setup the kernel time subsystem to get pr << 435 ticks into account */ << 436 tick_resolution = (struct sos_time) { .sec=0 << 437 sos_time_subsysem_setup(& tick_resolution); << 438 203 439 /* We need to know the RAM size */ !! 204 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 440 if (upper_mem == 0) !! 205 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 441 { 206 { 442 sos_x86_videomem_putstring(20, 0, 207 sos_x86_videomem_putstring(20, 0, 443 SOS_X86_VIDEO 208 SOS_X86_VIDEO_FG_LTRED 444 | SOS_X86_V 209 | SOS_X86_VIDEO_BG_BLUE 445 | SOS_X86_V 210 | SOS_X86_VIDEO_FG_BLINKING, 446 "I don't know !! 211 "I'm not loaded with Grub !"); 447 /* STOP ! */ 212 /* STOP ! */ 448 for (;;) 213 for (;;) 449 continue; 214 continue; 450 } 215 } 451 216 452 /* << 453 * Some interrupt handlers << 454 */ << 455 << 456 /* Binding some HW interrupts and exceptions 217 /* Binding some HW interrupts and exceptions to software routines */ 457 sos_irq_set_routine(SOS_IRQ_TIMER, 218 sos_irq_set_routine(SOS_IRQ_TIMER, 458 clk_it); !! 219 clk_it); 459 << 460 /* << 461 * Setup physical memory management << 462 */ << 463 << 464 SOS_ASSERT_FATAL(SOS_OK << 465 == sos_physmem_subsystem_se << 466 << 467 << 468 << 469 /* << 470 * Switch to paged-memory mode << 471 */ << 472 << 473 /* Disabling interrupts should seem more cor << 474 necessary at this stage */ << 475 SOS_ASSERT_FATAL(SOS_OK == << 476 sos_paging_subsystem_setup( << 477 << 478 << 479 /* Bind the page fault exception */ << 480 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA << 481 pgflt_ex); << 482 << 483 /* << 484 * Setup kernel virtual memory allocator << 485 */ << 486 << 487 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ << 488 sos_kernel_ << 489 bootstrap_s << 490 bootstrap_s << 491 + bootstrap << 492 sos_bochs_printf("Could not setup the Kern << 493 << 494 if (sos_kmalloc_subsystem_setup()) << 495 sos_bochs_printf("Could not setup the Kmal << 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 << 509 */ << 510 sos_swintr_subsystem_setup(); << 511 << 512 << 513 /* << 514 * Initialize the Kernel thread and schedule << 515 */ << 516 << 517 /* Initialize kernel thread subsystem */ << 518 sos_thread_subsystem_setup(bootstrap_stack_b << 519 bootstrap_stack_s << 520 << 521 /* Initialize the scheduler */ << 522 sos_sched_subsystem_setup(); << 523 << 524 /* Declare the IDLE thread */ << 525 SOS_ASSERT_FATAL(sos_create_kernel_thread("i << 526 SO << 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("s << 533 NU << 534 SO << 535 << 536 << 537 /* << 538 * Initialise user address space management << 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 << 549 /* Enabling the HW interrupts here, this wil 220 /* Enabling the HW interrupts here, this will make the timer HW 550 interrupt call the scheduler */ !! 221 interrupt call our clk_it handler */ 551 asm volatile ("sti\n"); 222 asm volatile ("sti\n"); >> 223 /* Multiboot says: "The value returned for upper memory is maximally >> 224 the address of the first upper memory hole minus 1 megabyte.". It >> 225 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ >> 226 sos_physmem_setup((mbi->mem_upper<<10) + (1<<20), >> 227 & sos_kernel_core_base_paddr, >> 228 & sos_kernel_core_top_paddr); >> 229 test_physmem(); >> 230 >> 231 /* An operatig system never ends */ >> 232 for (;;) >> 233 continue; 552 234 553 !! 235 return; 554 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_sub << 555 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_ << 556 << 557 << 558 << 559 << 560 << 561 /* Start the 'init' process, which in turns << 562 programs */ << 563 start_init(rootfs); << 564 /* << 565 * We can safely exit from this function now << 566 * an idle Kernel thread ready to make the C << 567 * << 568 * However, we must EXPLICITELY call sos_thr << 569 * simple "return" will return nowhere ! Act << 570 * was initialized by the Grub bootstrap sta << 571 * word "thread" did not exist. This means t << 572 * setup in order for a return here to call << 573 * automagically. Hence we must call it manu << 574 * kernel thread where we must do this manua << 575 */ << 576 sos_bochs_printf("Bye from primary thread !\ << 577 sos_thread_exit(); << 578 SOS_FATAL_ERROR("No trespassing !"); << 579 } 236 }
| [ source navigation ] | [ diff markup ] | [ identifier search ] | [ general search ] |