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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/klibc.h> 029 #include <sos/klibc.h> 037 #include <sos/assert.h> 030 #include <sos/assert.h> 038 #include <drivers/x86_videomem.h> 031 #include <drivers/x86_videomem.h> 039 #include <drivers/bochs.h> 032 #include <drivers/bochs.h> 040 #include <sos/calcload.h> << 041 033 042 034 043 /* Helper function to display each bits of a 3 035 /* Helper function to display each bits of a 32bits integer on the 044 screen as dark or light carrets */ 036 screen as dark or light carrets */ 045 void display_bits(unsigned char row, unsigned !! 037 static void display_bits(unsigned char row, unsigned char col, 046 unsigned char attribute, !! 038 unsigned char attribute, 047 sos_ui32_t integer) !! 039 sos_ui32_t integer) 048 { 040 { 049 int i; 041 int i; 050 /* Scan each bit of the integer, MSb first * 042 /* Scan each bit of the integer, MSb first */ 051 for (i = 31 ; i >= 0 ; i--) 043 for (i = 31 ; i >= 0 ; i--) 052 { 044 { 053 /* Test if bit i of 'integer' is set */ 045 /* Test if bit i of 'integer' is set */ 054 int bit_i = (integer & (1 << i)); 046 int bit_i = (integer & (1 << i)); 055 /* Ascii 219 => dark carret, Ascii 177 = 047 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 056 unsigned char ascii_code = bit_i?219:177 048 unsigned char ascii_code = bit_i?219:177; 057 sos_x86_videomem_putchar(row, col++, 049 sos_x86_videomem_putchar(row, col++, 058 attribute, 050 attribute, 059 ascii_code); 051 ascii_code); 060 } 052 } 061 } 053 } 062 054 063 055 064 /* Clock IRQ handler */ 056 /* Clock IRQ handler */ 065 static void clk_it(int intid) 057 static void clk_it(int intid) 066 { 058 { 067 static sos_ui32_t clock_count = 0; 059 static sos_ui32_t clock_count = 0; 068 060 069 display_bits(0, 48, 061 display_bits(0, 48, 070 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 062 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 071 clock_count); 063 clock_count); 072 clock_count++; 064 clock_count++; 073 065 074 /* Execute the expired timeout actions (if a << 075 sos_time_do_tick(); << 076 << 077 /* Update scheduler statistics and status */ << 078 sos_sched_do_timer_tick(); << 079 } 066 } 080 067 081 !! 068 #define MY_PPAGE_NUM_INT 511 082 /* =========================================== !! 069 struct my_ppage 083 * Page fault exception handling << 084 */ << 085 << 086 << 087 /* Page fault exception handler with demand pa << 088 static void pgflt_ex(int intid, struct sos_cpu << 089 { 070 { 090 static sos_ui32_t demand_paging_count = 0; !! 071 sos_ui32_t before[MY_PPAGE_NUM_INT]; 091 sos_vaddr_t faulting_vaddr = sos_cpu_contex !! 072 struct my_ppage *prev, *next; 092 sos_paddr_t ppage_paddr; !! 073 sos_ui32_t after[MY_PPAGE_NUM_INT]; 093 !! 074 }; /* sizeof() Must be <= 4kB */ 094 if (sos_cpu_context_is_in_user_mode(ctxt)) !! 075 095 { !! 076 static void test_physmem() 096 /* User-mode page faults are considered !! 077 { 097 moment */ !! 078 /* We place the pages we did allocate here */ 098 sos_bochs_printf("Unresolved USER page F !! 079 struct my_ppage *ppage_list, *my_ppage; 099 sos_cpu_context_get_PC( !! 080 sos_count_t num_alloc_ppages = 0, num_free_ppages = 0; 100 (unsigned)faulting_vadd !! 081 101 (unsigned)sos_cpu_conte !! 082 ppage_list = NULL; 102 sos_bochs_printf("Terminating User threa !! 083 while ((my_ppage = (struct my_ppage*)sos_physmem_ref_physpage_new(FALSE)) 103 sos_thread_exit(); !! 084 != NULL) 104 } << 105 << 106 /* Check if address is covered by any VMM ra << 107 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v << 108 { 085 { 109 /* No: The page fault is out of any kern !! 086 int i; 110 the moment, we don't handle this. */ !! 087 num_alloc_ppages++; 111 sos_display_fatal_error("Unresolved page !! 088 112 sos_cpu_context_ !! 089 /* Print the allocation status */ 113 (unsigned)faulti !! 090 sos_x86_videomem_printf(2, 0, 114 (unsigned)sos_cp !! 091 SOS_X86_VIDEO_FG_YELLOW 115 SOS_ASSERT_FATAL(! "Got page fault (note !! 092 | SOS_X86_VIDEO_BG_BLUE, 116 } !! 093 "Could allocate %d pages ", 117 !! 094 num_alloc_ppages); 118 !! 095 119 /* !! 096 /* We fill this page with its address */ 120 * Demand paging in kernel space !! 097 for (i = 0 ; i < MY_PPAGE_NUM_INT ; i++) 121 */ !! 098 my_ppage->before[i] = my_ppage->after[i] = (sos_ui32_t)my_ppage; 122 !! 099 123 /* Update the number of demand paging reques !! 100 /* We add this page at the tail of our list of ppages */ 124 demand_paging_count ++; !! 101 list_add_tail(ppage_list, my_ppage); 125 display_bits(0, 0, !! 102 } 126 SOS_X86_VIDEO_FG_LTRED | SOS_X8 !! 103 127 demand_paging_count); !! 104 /* Now we release these pages in FIFO order */ 128 !! 105 while ((my_ppage = list_pop_head(ppage_list)) != NULL) 129 /* Allocate a new page for the virtual addre !! 106 { 130 ppage_paddr = sos_physmem_ref_physpage_new(F !! 107 /* We make sure this page was not overwritten by any unexpected 131 if (! ppage_paddr) !! 108 value */ 132 SOS_ASSERT_FATAL(! "TODO: implement swap. !! 109 int i; 133 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp !! 110 for (i = 0 ; i < MY_PPAGE_NUM_INT ; i++) 134 SO << 135 FA << 136 SO << 137 | << 138 | << 139 sos_physmem_unref_physpage(ppage_paddr); << 140 << 141 /* Ok, we can now return to interrupted cont << 142 } << 143 << 144 << 145 /* =========================================== << 146 * Demonstrate the use of SOS kernel threads << 147 * - Kernel Threads are created with various << 148 * state is printed on both the console and << 149 * - For tests regarding threads' synchroniza << 150 */ << 151 << 152 struct thr_arg << 153 { << 154 char character; << 155 int color; << 156 << 157 int col; << 158 int row; << 159 }; << 160 << 161 << 162 static void demo_thread(void *arg) << 163 { << 164 struct thr_arg *thr_arg = (struct thr_arg*)a << 165 int progress = 0; << 166 << 167 sos_bochs_printf("start %c", thr_arg->charac << 168 while (1) << 169 { << 170 progress ++; << 171 display_bits(thr_arg->row, thr_arg->col+ << 172 << 173 sos_bochs_putchar(thr_arg->character); << 174 << 175 /* Yield the CPU to another thread somet << 176 if ((random() % 100) == 0) << 177 { << 178 sos_bochs_printf("[37myield(%c)[m\ << 179 sos_x86_videomem_putchar(thr_arg->ro << 180 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 181 sos_x86_videomem_putchar(thr_arg->ro << 182 } << 183 << 184 /* Go to sleep some other times... */ << 185 else if ((random() % 200) == 0) << 186 { 111 { 187 struct sos_time t = (struct sos_time !! 112 /* We don't get what we expect ! */ 188 sos_bochs_printf("[37msleep1(%c)[m !! 113 if ((my_ppage->before[i] != (sos_ui32_t)my_ppage) 189 sos_x86_videomem_putchar(thr_arg->ro !! 114 || (my_ppage->after[i] != (sos_ui32_t)my_ppage)) 190 SOS_ASSERT_FATAL(SOS_OK == sos_threa !! 115 { 191 SOS_ASSERT_FATAL(sos_time_is_zero(& !! 116 /* STOP ! */ 192 sos_x86_videomem_putchar(thr_arg->ro !! 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 } 193 } 123 } 194 124 195 /* Go to sleep for a longer time some ot !! 125 /* Release the descriptor */ 196 else if ((random() % 300) == 0) !! 126 if (sos_physmem_unref_physpage((sos_paddr_t)my_ppage) < 0) 197 { 127 { 198 struct sos_time t = (struct sos_time !! 128 /* STOP ! */ 199 sos_bochs_printf("[37msleep2(%c)[m !! 129 sos_x86_videomem_putstring(20, 0, 200 sos_x86_videomem_putchar(thr_arg->ro !! 130 SOS_X86_VIDEO_FG_LTRED 201 SOS_ASSERT_FATAL(SOS_OK == sos_threa !! 131 | SOS_X86_VIDEO_BG_BLUE, 202 SOS_ASSERT_FATAL(sos_time_is_zero(& !! 132 "Cannot release page"); 203 sos_x86_videomem_putchar(thr_arg->ro !! 133 return; 204 } 134 } 205 135 206 /* Infinite loop otherwise */ !! 136 /* Print the deallocation status */ 207 } !! 137 num_free_ppages ++; 208 } !! 138 sos_x86_videomem_printf(2, 0, 209 !! 139 SOS_X86_VIDEO_FG_YELLOW 210 !! 140 | SOS_X86_VIDEO_BG_BLUE, 211 static void test_thread() !! 141 "Could free %d pages ", 212 { !! 142 num_free_ppages); 213 /* "static" variables because we want them t << 214 function returns */ << 215 static struct thr_arg arg_b, arg_c, arg_d, a << 216 sos_ui32_t flags; << 217 << 218 sos_disable_IRQs(flags); << 219 << 220 arg_b = (struct thr_arg) { .character='b', . << 221 sos_create_kernel_thread("YO[b]", demo_threa << 222 << 223 arg_c = (struct thr_arg) { .character='c', . << 224 sos_create_kernel_thread("YO[c]", demo_threa << 225 << 226 arg_d = (struct thr_arg) { .character='d', . << 227 sos_create_kernel_thread("YO[d]", demo_threa << 228 << 229 arg_e = (struct thr_arg) { .character='e', . << 230 sos_create_kernel_thread("YO[e]", demo_threa << 231 << 232 arg_R = (struct thr_arg) { .character='R', . << 233 sos_create_kernel_thread("YO[R]", demo_threa << 234 << 235 arg_S = (struct thr_arg) { .character='S', . << 236 sos_create_kernel_thread("YO[S]", demo_threa << 237 << 238 sos_restore_IRQs(flags); << 239 } << 240 << 241 << 242 /* =========================================== << 243 * An operating system MUST always have a read << 244 * what would the CPU have to execute ?! << 245 */ << 246 static void idle_thread() << 247 { << 248 sos_ui32_t idle_twiddle = 0; << 249 << 250 while (1) << 251 { << 252 /* Remove this instruction if you get an << 253 exception (old 80386 CPU) */ << 254 asm("hlt\n"); << 255 << 256 idle_twiddle ++; << 257 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE << 258 idle_twiddle); << 259 << 260 /* Lend the CPU to some other thread */ << 261 sos_thread_yield(); << 262 } 143 } 263 } << 264 144 >> 145 /* Print the overall stats */ >> 146 sos_x86_videomem_printf(2, 0, >> 147 SOS_X86_VIDEO_FG_LTGREEN >> 148 | SOS_X86_VIDEO_BG_BLUE, >> 149 "Could allocate %d bytes, could free %d bytes ", >> 150 num_alloc_ppages << SOS_PAGE_SHIFT, >> 151 num_free_ppages << SOS_PAGE_SHIFT); 265 152 266 /* =========================================== !! 153 SOS_ASSERT_FATAL(num_alloc_ppages == num_free_ppages); 267 * Kernel thread showing some CPU usage statis << 268 */ << 269 static void stat_thread() << 270 { << 271 while (1) << 272 { << 273 sos_ui32_t flags; << 274 sos_ui32_t load1, load5, load15; << 275 char str1[11], str5[11], str15[11]; << 276 struct sos_time t; << 277 t.sec = 1; << 278 t.nanosec = 0; << 279 << 280 sos_thread_sleep(& t); << 281 << 282 sos_disable_IRQs(flags); << 283 << 284 /* The IDLE task is EXcluded in the foll << 285 sos_load_get_sload(&load1, &load5, &load << 286 sos_load_to_string(str1, load1); << 287 sos_load_to_string(str5, load5); << 288 sos_load_to_string(str15, load15); << 289 sos_x86_videomem_printf(16, 34, << 290 SOS_X86_VIDEO_FG << 291 "Kernel (- Idle) << 292 str1, str5, str1 << 293 << 294 sos_load_get_uload(&load1, &load5, &load << 295 sos_load_to_string(str1, load1); << 296 sos_load_to_string(str5, load5); << 297 sos_load_to_string(str15, load15); << 298 sos_x86_videomem_printf(17, 34, << 299 SOS_X86_VIDEO_FG << 300 "User: %s %s %s << 301 str1, str5, str1 << 302 << 303 sos_load_get_uratio(&load1, &load5, &loa << 304 sos_load_to_string(str1, load1); << 305 sos_load_to_string(str5, load5); << 306 sos_load_to_string(str15, load15); << 307 sos_x86_videomem_printf(18, 34, << 308 SOS_X86_VIDEO_FG << 309 "User CPU %%: %s << 310 str1, str5, str1 << 311 << 312 /* The IDLE task is INcluded in the foll << 313 sos_load_get_sratio(&load1, &load5, &loa << 314 sos_load_to_string(str1, load1); << 315 sos_load_to_string(str5, load5); << 316 sos_load_to_string(str15, load15); << 317 sos_x86_videomem_printf(19, 34, << 318 SOS_X86_VIDEO_FG << 319 "Kernel CPU %% ( << 320 str1, str5, str1 << 321 sos_restore_IRQs(flags); << 322 } << 323 } 154 } 324 155 325 156 326 /* =========================================== !! 157 /* The C entry point of our operating system */ 327 * The C entry point of our operating system << 328 */ << 329 void sos_main(unsigned long magic, unsigned lo 158 void sos_main(unsigned long magic, unsigned long addr) 330 { 159 { 331 unsigned i; 160 unsigned i; 332 sos_paddr_t sos_kernel_core_base_paddr, sos_ 161 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 333 struct sos_time tick_resolution; << 334 162 335 /* Grub sends us a structure, called multibo 163 /* Grub sends us a structure, called multiboot_info_t with a lot of 336 precious informations about the system, s 164 precious informations about the system, see the multiboot 337 documentation for more information. */ 165 documentation for more information. */ 338 multiboot_info_t *mbi; 166 multiboot_info_t *mbi; 339 mbi = (multiboot_info_t *) addr; 167 mbi = (multiboot_info_t *) addr; 340 168 341 /* Setup bochs and console, and clear the co 169 /* Setup bochs and console, and clear the console */ 342 sos_bochs_setup(); 170 sos_bochs_setup(); 343 171 344 sos_x86_videomem_setup(); 172 sos_x86_videomem_setup(); 345 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 173 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 346 174 347 /* Greetings from SOS */ 175 /* Greetings from SOS */ 348 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 176 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 349 /* Loaded with Grub */ 177 /* Loaded with Grub */ 350 sos_x86_videomem_printf(1, 0, 178 sos_x86_videomem_printf(1, 0, 351 SOS_X86_VIDEO_FG_Y 179 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 352 "Welcome From GRUB 180 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 353 "SOS article 7", ' !! 181 "SOS", ',', 354 (unsigned)(mbi->me 182 (unsigned)(mbi->mem_upper >> 10) + 1, 355 (unsigned)mbi->mem 183 (unsigned)mbi->mem_upper); 356 else 184 else 357 /* Not loaded with grub */ 185 /* Not loaded with grub */ 358 sos_x86_videomem_printf(1, 0, 186 sos_x86_videomem_printf(1, 0, 359 SOS_X86_VIDEO_FG_Y 187 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 360 "Welcome to SOS ar !! 188 "Welcome to SOS"); 361 189 362 sos_bochs_putstring("Message in a bochs: Thi !! 190 sos_bochs_putstring("Message in a bochs\n"); 363 191 364 /* Setup CPU segmentation and IRQ subsystem 192 /* Setup CPU segmentation and IRQ subsystem */ 365 sos_gdt_subsystem_setup(); !! 193 sos_gdt_setup(); 366 sos_idt_subsystem_setup(); !! 194 sos_idt_setup(); 367 195 368 /* Setup SOS IRQs and exceptions subsystem * 196 /* Setup SOS IRQs and exceptions subsystem */ 369 sos_exception_subsystem_setup(); !! 197 sos_exceptions_setup(); 370 sos_irq_subsystem_setup(); !! 198 sos_irq_setup(); 371 199 372 /* Configure the timer so as to raise the IR 200 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 373 sos_i8254_set_frequency(100); 201 sos_i8254_set_frequency(100); 374 202 375 /* Setup the kernel time subsystem to get pr << 376 ticks into account */ << 377 tick_resolution = (struct sos_time) { .sec=0 << 378 sos_time_subsysem_setup(& tick_resolution); << 379 203 380 /* We need a multiboot-compliant boot loader 204 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 381 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 205 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 382 { 206 { 383 sos_x86_videomem_putstring(20, 0, 207 sos_x86_videomem_putstring(20, 0, 384 SOS_X86_VIDEO 208 SOS_X86_VIDEO_FG_LTRED 385 | SOS_X86_V 209 | SOS_X86_VIDEO_BG_BLUE 386 | SOS_X86_V 210 | SOS_X86_VIDEO_FG_BLINKING, 387 "I'm not load 211 "I'm not loaded with Grub !"); 388 /* STOP ! */ 212 /* STOP ! */ 389 for (;;) 213 for (;;) 390 continue; 214 continue; 391 } 215 } 392 216 393 /* << 394 * Some interrupt handlers << 395 */ << 396 << 397 /* Binding some HW interrupts and exceptions 217 /* Binding some HW interrupts and exceptions to software routines */ 398 sos_irq_set_routine(SOS_IRQ_TIMER, 218 sos_irq_set_routine(SOS_IRQ_TIMER, 399 clk_it); !! 219 clk_it); 400 !! 220 /* Enabling the HW interrupts here, this will make the timer HW 401 /* !! 221 interrupt call our clk_it handler */ 402 * Setup physical memory management !! 222 asm volatile ("sti\n"); 403 */ << 404 << 405 /* Multiboot says: "The value returned for u 223 /* Multiboot says: "The value returned for upper memory is maximally 406 the address of the first upper memory hol 224 the address of the first upper memory hole minus 1 megabyte.". It 407 also adds: "It is not guaranteed to be th 225 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 408 sos_physmem_subsystem_setup((mbi->mem_upper< !! 226 sos_physmem_setup((mbi->mem_upper<<10) + (1<<20), 409 & sos_kernel_cor !! 227 & sos_kernel_core_base_paddr, 410 & sos_kernel_cor !! 228 & sos_kernel_core_top_paddr); 411 !! 229 test_physmem(); 412 /* !! 230 413 * Switch to paged-memory mode !! 231 /* An operatig system never ends */ 414 */ !! 232 for (;;) 415 !! 233 continue; 416 /* Disabling interrupts should seem more cor << 417 necessary at this stage */ << 418 SOS_ASSERT_FATAL(SOS_OK == << 419 sos_paging_subsystem_setup( << 420 << 421 << 422 /* Bind the page fault exception */ << 423 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA << 424 pgflt_ex); << 425 << 426 /* << 427 * Setup kernel virtual memory allocator << 428 */ << 429 << 430 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ << 431 sos_kernel_ << 432 bootstrap_s << 433 bootstrap_s << 434 + bootstrap << 435 sos_bochs_printf("Could not setup the Kern << 436 << 437 if (sos_kmalloc_subsystem_setup()) << 438 sos_bochs_printf("Could not setup the Kmal << 439 << 440 /* << 441 * Initialize the MMU context subsystem << 442 */ << 443 sos_mm_context_subsystem_setup(); << 444 << 445 /* << 446 * Initialize the CPU context subsystem << 447 */ << 448 sos_cpu_context_subsystem_setup(); << 449 << 450 /* << 451 * Bind the syscall handler to its software << 452 */ << 453 sos_swintr_subsystem_setup(); << 454 << 455 << 456 /* << 457 * Initialize the Kernel thread and schedule << 458 */ << 459 << 460 /* Initialize kernel thread subsystem */ << 461 sos_thread_subsystem_setup(bootstrap_stack_b << 462 bootstrap_stack_s << 463 << 464 /* Initialize the scheduler */ << 465 sos_sched_subsystem_setup(); << 466 << 467 /* Declare the IDLE thread */ << 468 SOS_ASSERT_FATAL(sos_create_kernel_thread("i << 469 SO << 470 << 471 /* Prepare the stats subsystem */ << 472 sos_load_subsystem_setup(); << 473 << 474 /* Declare a thread that prints some stats * << 475 SOS_ASSERT_FATAL(sos_create_kernel_thread("s << 476 NU << 477 SO << 478 << 479 << 480 /* << 481 * Initialize process stuff << 482 */ << 483 sos_process_subsystem_setup(); << 484 << 485 << 486 /* Enabling the HW interrupts here, this wil << 487 interrupt call the scheduler */ << 488 asm volatile ("sti\n"); << 489 234 490 /* Run some tests involving USER processes a !! 235 return; 491 extern void test_art7(); << 492 test_art7(); << 493 << 494 /* Now run some Kernel threads just for fun << 495 extern void MouseSim(); << 496 MouseSim(); << 497 test_thread(); << 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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