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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 definitions of the multiboot standa 020 /* Include definitions of the multiboot standard */ 020 #include <bootstrap/multiboot.h> 021 #include <bootstrap/multiboot.h> 021 #include <hwcore/idt.h> 022 #include <hwcore/idt.h> 022 #include <hwcore/gdt.h> 023 #include <hwcore/gdt.h> 023 #include <hwcore/irq.h> 024 #include <hwcore/irq.h> 024 #include <hwcore/exception.h> 025 #include <hwcore/exception.h> 025 #include <hwcore/i8254.h> 026 #include <hwcore/i8254.h> 026 #include <sos/list.h> 027 #include <sos/list.h> 027 #include <sos/physmem.h> 028 #include <sos/physmem.h> 028 #include <hwcore/paging.h> << 029 #include <hwcore/mm_context.h> << 030 #include <hwcore/swintr.h> << 031 #include <sos/kmem_vmm.h> << 032 #include <sos/kmalloc.h> << 033 #include <sos/time.h> << 034 #include <sos/thread.h> << 035 #include <sos/process.h> << 036 #include <sos/umem_vmm.h> << 037 #include <sos/klibc.h> 029 #include <sos/klibc.h> 038 #include <sos/assert.h> 030 #include <sos/assert.h> 039 #include <drivers/x86_videomem.h> 031 #include <drivers/x86_videomem.h> 040 #include <drivers/bochs.h> 032 #include <drivers/bochs.h> 041 #include <sos/calcload.h> << 042 #include <sos/umem_vmm.h> << 043 #include <sos/binfmt_elf32.h> << 044 #include <drivers/zero.h> << 045 033 046 034 047 /* Helper function to display each bits of a 3 035 /* Helper function to display each bits of a 32bits integer on the 048 screen as dark or light carrets */ 036 screen as dark or light carrets */ 049 void display_bits(unsigned char row, unsigned !! 037 static void display_bits(unsigned char row, unsigned char col, 050 unsigned char attribute, !! 038 unsigned char attribute, 051 sos_ui32_t integer) !! 039 sos_ui32_t integer) 052 { 040 { 053 int i; 041 int i; 054 /* Scan each bit of the integer, MSb first * 042 /* Scan each bit of the integer, MSb first */ 055 for (i = 31 ; i >= 0 ; i--) 043 for (i = 31 ; i >= 0 ; i--) 056 { 044 { 057 /* Test if bit i of 'integer' is set */ 045 /* Test if bit i of 'integer' is set */ 058 int bit_i = (integer & (1 << i)); 046 int bit_i = (integer & (1 << i)); 059 /* Ascii 219 => dark carret, Ascii 177 = 047 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 060 unsigned char ascii_code = bit_i?219:177 048 unsigned char ascii_code = bit_i?219:177; 061 sos_x86_videomem_putchar(row, col++, 049 sos_x86_videomem_putchar(row, col++, 062 attribute, 050 attribute, 063 ascii_code); 051 ascii_code); 064 } 052 } 065 } 053 } 066 054 067 055 068 /* Clock IRQ handler */ 056 /* Clock IRQ handler */ 069 static void clk_it(int intid) 057 static void clk_it(int intid) 070 { 058 { 071 static sos_ui32_t clock_count = 0; 059 static sos_ui32_t clock_count = 0; 072 060 073 display_bits(0, 48, 061 display_bits(0, 48, 074 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 062 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 075 clock_count); 063 clock_count); 076 clock_count++; 064 clock_count++; 077 065 078 /* Execute the expired timeout actions (if a << 079 sos_time_do_tick(); << 080 << 081 /* Update scheduler statistics and status */ << 082 sos_sched_do_timer_tick(); << 083 } 066 } 084 067 085 !! 068 #define MY_PPAGE_NUM_INT 511 086 /* =========================================== !! 069 struct my_ppage 087 * Page fault exception handling << 088 */ << 089 << 090 << 091 /* Page fault exception handler with demand pa << 092 static void pgflt_ex(int intid, struct sos_cpu << 093 { 070 { 094 static sos_ui32_t demand_paging_count = 0; !! 071 sos_ui32_t before[MY_PPAGE_NUM_INT]; 095 struct sos_thread * cur_thr = sos_thread_get !! 072 struct my_ppage *prev, *next; 096 sos_vaddr_t faulting_vaddr = sos_cpu_contex !! 073 sos_ui32_t after[MY_PPAGE_NUM_INT]; 097 sos_paddr_t ppage_paddr; !! 074 }; /* sizeof() Must be <= 4kB */ 098 !! 075 099 if (sos_cpu_context_is_in_user_mode(ctxt) !! 076 static void test_physmem() 100 || (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) 101 { 085 { 102 __label__ unforce_address_space; !! 086 int i; 103 sos_bool_t need_to_setup_mmu; !! 087 num_alloc_ppages++; 104 sos_ui32_t errcode = sos_cpu_context_get !! 088 105 !! 089 /* Print the allocation status */ 106 /* Make sure to always stay in the inter !! 090 sos_x86_videomem_printf(2, 0, 107 configuration */ !! 091 SOS_X86_VIDEO_FG_YELLOW 108 need_to_setup_mmu = (cur_thr->squatted_m !! 092 | SOS_X86_VIDEO_BG_BLUE, 109 != sos_process_get_ !! 093 "Could allocate %d pages ", 110 if (need_to_setup_mmu) !! 094 num_alloc_ppages); 111 sos_thread_prepare_user_space_access(N !! 095 112 !! 096 /* We fill this page with its address */ 113 if (SOS_OK == !! 097 for (i = 0 ; i < MY_PPAGE_NUM_INT ; i++) 114 sos_umem_vmm_try_resolve_page_fault( !! 098 my_ppage->before[i] = my_ppage->after[i] = (sos_ui32_t)my_ppage; 115 !! 099 116 !! 100 /* We add this page at the tail of our list of ppages */ 117 goto unforce_address_space; !! 101 list_add_tail(ppage_list, my_ppage); 118 !! 102 } 119 /* If the page fault occured in kernel m !! 103 120 the fixup address */ !! 104 /* Now we release these pages in FIFO order */ 121 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++) 122 { 111 { 123 cur_thr->fixup_uaccess.faulted_uaddr !! 112 /* We don't get what we expect ! */ 124 sos_cpu_context_set_EX_return_addres !! 113 if ((my_ppage->before[i] != (sos_ui32_t)my_ppage) 125 !! 114 || (my_ppage->after[i] != (sos_ui32_t)my_ppage)) 126 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 } 127 } 123 } 128 124 129 if (need_to_setup_mmu) !! 125 /* Release the descriptor */ 130 sos_thread_end_user_space_access(); !! 126 if (sos_physmem_unref_physpage((sos_paddr_t)my_ppage) < 0) 131 !! 127 { 132 sos_bochs_printf("Unresolved USER page F !! 128 /* STOP ! */ 133 sos_cpu_context_get_PC( !! 129 sos_x86_videomem_putstring(20, 0, 134 (unsigned)faulting_vadd !! 130 SOS_X86_VIDEO_FG_LTRED 135 (unsigned)sos_cpu_conte !! 131 | SOS_X86_VIDEO_BG_BLUE, 136 sos_bochs_printf("Terminating User threa !! 132 "Cannot release page"); 137 sos_thread_exit(); !! 133 return; 138 !! 134 } 139 unforce_address_space: << 140 if (need_to_setup_mmu) << 141 sos_thread_end_user_space_access(); << 142 return; << 143 } << 144 << 145 /* Check if address is covered by any VMM ra << 146 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v << 147 { << 148 /* No: The page fault is out of any kern << 149 the moment, we don't handle this. */ << 150 sos_display_fatal_error("Unresolved page << 151 sos_cpu_context_ << 152 (unsigned)faulti << 153 (unsigned)sos_cp << 154 SOS_ASSERT_FATAL(! "Got page fault (note << 155 } << 156 << 157 << 158 /* << 159 * Demand paging in kernel space << 160 */ << 161 << 162 /* Update the number of demand paging reques << 163 demand_paging_count ++; << 164 display_bits(0, 0, << 165 SOS_X86_VIDEO_FG_LTRED | SOS_X8 << 166 demand_paging_count); << 167 << 168 /* Allocate a new page for the virtual addre << 169 ppage_paddr = sos_physmem_ref_physpage_new(F << 170 if (! ppage_paddr) << 171 SOS_ASSERT_FATAL(! "TODO: implement swap. << 172 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp << 173 SO << 174 FA << 175 SO << 176 | << 177 | << 178 sos_physmem_unref_physpage(ppage_paddr); << 179 << 180 /* Ok, we can now return to interrupted cont << 181 } << 182 << 183 << 184 << 185 /* =========================================== << 186 * An operating system MUST always have a read << 187 * what would the CPU have to execute ?! << 188 */ << 189 static void idle_thread() << 190 { << 191 sos_ui32_t idle_twiddle = 0; << 192 << 193 while (1) << 194 { << 195 /* Remove this instruction if you get an << 196 exception (old 80386 CPU) */ << 197 asm("hlt\n"); << 198 << 199 idle_twiddle ++; << 200 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE << 201 idle_twiddle); << 202 << 203 /* Lend the CPU to some other thread */ << 204 sos_thread_yield(); << 205 } << 206 } << 207 << 208 << 209 /* =========================================== << 210 * Kernel thread showing some CPU usage statis << 211 */ << 212 static void stat_thread() << 213 { << 214 while (1) << 215 { << 216 sos_ui32_t flags; << 217 sos_ui32_t load1, load5, load15; << 218 char str1[11], str5[11], str15[11]; << 219 struct sos_time t; << 220 t.sec = 1; << 221 t.nanosec = 0; << 222 << 223 sos_thread_sleep(& t); << 224 << 225 sos_disable_IRQs(flags); << 226 << 227 /* The IDLE task is EXcluded in the foll << 228 sos_load_get_sload(&load1, &load5, &load << 229 sos_load_to_string(str1, load1); << 230 sos_load_to_string(str5, load5); << 231 sos_load_to_string(str15, load15); << 232 sos_x86_videomem_printf(16, 34, << 233 SOS_X86_VIDEO_FG << 234 "Kernel (- Idle) << 235 str1, str5, str1 << 236 << 237 sos_load_get_uload(&load1, &load5, &load << 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(17, 34, << 242 SOS_X86_VIDEO_FG << 243 "User: %s %s %s << 244 str1, str5, str1 << 245 << 246 sos_load_get_uratio(&load1, &load5, &loa << 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(18, 34, << 251 SOS_X86_VIDEO_FG << 252 "User CPU %%: %s << 253 str1, str5, str1 << 254 << 255 /* The IDLE task is INcluded in the foll << 256 sos_load_get_sratio(&load1, &load5, &loa << 257 sos_load_to_string(str1, load1); << 258 sos_load_to_string(str5, load5); << 259 sos_load_to_string(str15, load15); << 260 sos_x86_videomem_printf(19, 34, << 261 SOS_X86_VIDEO_FG << 262 "Kernel CPU %% ( << 263 str1, str5, str1 << 264 sos_restore_IRQs(flags); << 265 } << 266 } << 267 << 268 135 269 /* =========================================== !! 136 /* Print the deallocation status */ 270 * Start the "init" (userland) process !! 137 num_free_ppages ++; 271 */ !! 138 sos_x86_videomem_printf(2, 0, 272 static sos_ret_t start_init() !! 139 SOS_X86_VIDEO_FG_YELLOW 273 { !! 140 | SOS_X86_VIDEO_BG_BLUE, 274 sos_ret_t retval; !! 141 "Could free %d pages ", 275 struct sos_umem_vmm_as *as_init; !! 142 num_free_ppages); 276 struct sos_process *proc_init; << 277 struct sos_thread *new_thr; << 278 sos_uaddr_t ustack, start_uaddr; << 279 << 280 /* Create the new process */ << 281 proc_init = sos_process_create("init", FALSE << 282 if (! proc_init) << 283 return -SOS_ENOMEM; << 284 as_init = sos_process_get_address_space(proc << 285 << 286 /* Map the 'init' program in user space */ << 287 start_uaddr = sos_binfmt_elf32_map(as_init, << 288 if (0 == start_uaddr) << 289 { << 290 sos_process_unref(proc_init); << 291 return -SOS_ENOENT; << 292 } << 293 << 294 /* Allocate the user stack */ << 295 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ << 296 retval = sos_dev_zero_map(as_init, &ustack, << 297 SOS_VM_MAP_PROT_RE << 298 /* PRIVATE */ 0); << 299 if (SOS_OK != retval) << 300 { << 301 sos_bochs_printf("ici 2\n"); << 302 sos_process_unref(proc_init); << 303 return -SOS_ENOMEM; << 304 } 143 } 305 144 306 /* Now create the user thread */ !! 145 /* Print the overall stats */ 307 new_thr = sos_create_user_thread(NULL, !! 146 sos_x86_videomem_printf(2, 0, 308 proc_init, !! 147 SOS_X86_VIDEO_FG_LTGREEN 309 start_uaddr !! 148 | SOS_X86_VIDEO_BG_BLUE, 310 0, 0, !! 149 "Could allocate %d bytes, could free %d bytes ", 311 ustack + SO !! 150 num_alloc_ppages << SOS_PAGE_SHIFT, 312 SOS_SCHED_P !! 151 num_free_ppages << SOS_PAGE_SHIFT); 313 if (! new_thr) << 314 { << 315 sos_bochs_printf("ici 3\n"); << 316 sos_process_unref(proc_init); << 317 return -SOS_ENOMEM; << 318 } << 319 152 320 sos_process_unref(proc_init); !! 153 SOS_ASSERT_FATAL(num_alloc_ppages == num_free_ppages); 321 return SOS_OK; << 322 } 154 } 323 155 324 156 325 /* =========================================== !! 157 /* The C entry point of our operating system */ 326 * The C entry point of our operating system << 327 */ << 328 void sos_main(unsigned long magic, unsigned lo 158 void sos_main(unsigned long magic, unsigned long addr) 329 { 159 { 330 unsigned i; 160 unsigned i; 331 sos_paddr_t sos_kernel_core_base_paddr, sos_ 161 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 332 struct sos_time tick_resolution; << 333 162 334 /* Grub sends us a structure, called multibo 163 /* Grub sends us a structure, called multiboot_info_t with a lot of 335 precious informations about the system, s 164 precious informations about the system, see the multiboot 336 documentation for more information. */ 165 documentation for more information. */ 337 multiboot_info_t *mbi; 166 multiboot_info_t *mbi; 338 mbi = (multiboot_info_t *) addr; 167 mbi = (multiboot_info_t *) addr; 339 168 340 /* Setup bochs and console, and clear the co 169 /* Setup bochs and console, and clear the console */ 341 sos_bochs_setup(); 170 sos_bochs_setup(); 342 171 343 sos_x86_videomem_setup(); 172 sos_x86_videomem_setup(); 344 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 173 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 345 174 346 /* Greetings from SOS */ 175 /* Greetings from SOS */ 347 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 176 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 348 /* Loaded with Grub */ 177 /* Loaded with Grub */ 349 sos_x86_videomem_printf(1, 0, 178 sos_x86_videomem_printf(1, 0, 350 SOS_X86_VIDEO_FG_Y 179 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 351 "Welcome From GRUB 180 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 352 "SOS article 7.5", !! 181 "SOS", ',', 353 (unsigned)(mbi->me 182 (unsigned)(mbi->mem_upper >> 10) + 1, 354 (unsigned)mbi->mem 183 (unsigned)mbi->mem_upper); 355 else 184 else 356 /* Not loaded with grub */ 185 /* Not loaded with grub */ 357 sos_x86_videomem_printf(1, 0, 186 sos_x86_videomem_printf(1, 0, 358 SOS_X86_VIDEO_FG_Y 187 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 359 "Welcome to SOS ar !! 188 "Welcome to SOS"); 360 189 361 sos_bochs_putstring("Message in a bochs: Thi !! 190 sos_bochs_putstring("Message in a bochs\n"); 362 191 363 /* Setup CPU segmentation and IRQ subsystem 192 /* Setup CPU segmentation and IRQ subsystem */ 364 sos_gdt_subsystem_setup(); !! 193 sos_gdt_setup(); 365 sos_idt_subsystem_setup(); !! 194 sos_idt_setup(); 366 195 367 /* Setup SOS IRQs and exceptions subsystem * 196 /* Setup SOS IRQs and exceptions subsystem */ 368 sos_exception_subsystem_setup(); !! 197 sos_exceptions_setup(); 369 sos_irq_subsystem_setup(); !! 198 sos_irq_setup(); 370 199 371 /* Configure the timer so as to raise the IR 200 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 372 sos_i8254_set_frequency(100); 201 sos_i8254_set_frequency(100); 373 202 374 /* Setup the kernel time subsystem to get pr << 375 ticks into account */ << 376 tick_resolution = (struct sos_time) { .sec=0 << 377 sos_time_subsysem_setup(& tick_resolution); << 378 203 379 /* We need a multiboot-compliant boot loader 204 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 380 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 205 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 381 { 206 { 382 sos_x86_videomem_putstring(20, 0, 207 sos_x86_videomem_putstring(20, 0, 383 SOS_X86_VIDEO 208 SOS_X86_VIDEO_FG_LTRED 384 | SOS_X86_V 209 | SOS_X86_VIDEO_BG_BLUE 385 | SOS_X86_V 210 | SOS_X86_VIDEO_FG_BLINKING, 386 "I'm not load 211 "I'm not loaded with Grub !"); 387 /* STOP ! */ 212 /* STOP ! */ 388 for (;;) 213 for (;;) 389 continue; 214 continue; 390 } 215 } 391 216 392 /* << 393 * Some interrupt handlers << 394 */ << 395 << 396 /* Binding some HW interrupts and exceptions 217 /* Binding some HW interrupts and exceptions to software routines */ 397 sos_irq_set_routine(SOS_IRQ_TIMER, 218 sos_irq_set_routine(SOS_IRQ_TIMER, 398 clk_it); !! 219 clk_it); 399 !! 220 /* Enabling the HW interrupts here, this will make the timer HW 400 /* !! 221 interrupt call our clk_it handler */ 401 * Setup physical memory management !! 222 asm volatile ("sti\n"); 402 */ << 403 << 404 /* Multiboot says: "The value returned for u 223 /* Multiboot says: "The value returned for upper memory is maximally 405 the address of the first upper memory hol 224 the address of the first upper memory hole minus 1 megabyte.". It 406 also adds: "It is not guaranteed to be th 225 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 407 sos_physmem_subsystem_setup((mbi->mem_upper< !! 226 sos_physmem_setup((mbi->mem_upper<<10) + (1<<20), 408 & sos_kernel_cor !! 227 & sos_kernel_core_base_paddr, 409 & sos_kernel_cor !! 228 & sos_kernel_core_top_paddr); 410 !! 229 test_physmem(); 411 /* !! 230 412 * Switch to paged-memory mode !! 231 /* An operatig system never ends */ 413 */ !! 232 for (;;) 414 !! 233 continue; 415 /* Disabling interrupts should seem more cor << 416 necessary at this stage */ << 417 SOS_ASSERT_FATAL(SOS_OK == << 418 sos_paging_subsystem_setup( << 419 << 420 << 421 /* Bind the page fault exception */ << 422 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA << 423 pgflt_ex); << 424 << 425 /* << 426 * Setup kernel virtual memory allocator << 427 */ << 428 << 429 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ << 430 sos_kernel_ << 431 bootstrap_s << 432 bootstrap_s << 433 + bootstrap << 434 sos_bochs_printf("Could not setup the Kern << 435 << 436 if (sos_kmalloc_subsystem_setup()) << 437 sos_bochs_printf("Could not setup the Kmal << 438 << 439 /* << 440 * Initialize the MMU context subsystem << 441 */ << 442 sos_mm_context_subsystem_setup(); << 443 << 444 /* << 445 * Initialize the CPU context subsystem << 446 */ << 447 sos_cpu_context_subsystem_setup(); << 448 << 449 /* << 450 * Bind the syscall handler to its software << 451 */ << 452 sos_swintr_subsystem_setup(); << 453 << 454 << 455 /* << 456 * Initialize the Kernel thread and schedule << 457 */ << 458 << 459 /* Initialize kernel thread subsystem */ << 460 sos_thread_subsystem_setup(bootstrap_stack_b << 461 bootstrap_stack_s << 462 << 463 /* Initialize the scheduler */ << 464 sos_sched_subsystem_setup(); << 465 << 466 /* Declare the IDLE thread */ << 467 SOS_ASSERT_FATAL(sos_create_kernel_thread("i << 468 SO << 469 << 470 /* Prepare the stats subsystem */ << 471 sos_load_subsystem_setup(); << 472 << 473 /* Declare a thread that prints some stats * << 474 SOS_ASSERT_FATAL(sos_create_kernel_thread("s << 475 NU << 476 SO << 477 << 478 << 479 /* << 480 * Initialise user address space management << 481 */ << 482 sos_umem_vmm_subsystem_setup(); << 483 sos_dev_zero_subsystem_setup(); << 484 << 485 /* << 486 * Initialize process stuff << 487 */ << 488 sos_process_subsystem_setup(); << 489 << 490 << 491 /* Enabling the HW interrupts here, this wil << 492 interrupt call the scheduler */ << 493 asm volatile ("sti\n"); << 494 234 495 /* Start the 'init' process, which in turns !! 235 return; 496 programs */ << 497 start_init(); << 498 << 499 /* << 500 * We can safely exit from this function now << 501 * an idle Kernel thread ready to make the C << 502 * << 503 * However, we must EXPLICITELY call sos_thr << 504 * simple "return" will return nowhere ! Act << 505 * was initialized by the Grub bootstrap sta << 506 * word "thread" did not exist. This means t << 507 * setup in order for a return here to call << 508 * automagically. Hence we must call it manu << 509 * kernel thread where we must do this manua << 510 */ << 511 sos_bochs_printf("Bye from primary thread !\ << 512 sos_thread_exit(); << 513 SOS_FATAL_ERROR("No trespassing !"); << 514 } 236 }
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