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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 */ 019 018 020 /* Include definitions of the multiboot standa 019 /* Include definitions of the multiboot standard */ 021 #include <bootstrap/multiboot.h> 020 #include <bootstrap/multiboot.h> 022 #include <hwcore/idt.h> 021 #include <hwcore/idt.h> 023 #include <hwcore/gdt.h> 022 #include <hwcore/gdt.h> 024 #include <hwcore/irq.h> 023 #include <hwcore/irq.h> 025 #include <hwcore/exception.h> 024 #include <hwcore/exception.h> 026 #include <hwcore/i8254.h> 025 #include <hwcore/i8254.h> >> 026 #include <sos/list.h> >> 027 #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> 027 #include <sos/klibc.h> 036 #include <sos/klibc.h> 028 #include <sos/assert.h> 037 #include <sos/assert.h> 029 #include <drivers/x86_videomem.h> 038 #include <drivers/x86_videomem.h> 030 #include <drivers/bochs.h> 039 #include <drivers/bochs.h> >> 040 #include <sos/calcload.h> 031 041 032 042 033 /* Helper function to display each bits of a 3 043 /* Helper function to display each bits of a 32bits integer on the 034 screen as dark or light carrets */ 044 screen as dark or light carrets */ 035 static void display_bits(unsigned char row, un !! 045 void display_bits(unsigned char row, unsigned char col, 036 unsigned char attribu !! 046 unsigned char attribute, 037 sos_ui32_t integer) !! 047 sos_ui32_t integer) 038 { 048 { 039 int i; 049 int i; 040 /* Scan each bit of the integer, MSb first * 050 /* Scan each bit of the integer, MSb first */ 041 for (i = 31 ; i >= 0 ; i--) 051 for (i = 31 ; i >= 0 ; i--) 042 { 052 { 043 /* Test if bit i of 'integer' is set */ 053 /* Test if bit i of 'integer' is set */ 044 int bit_i = (integer & (1 << i)); 054 int bit_i = (integer & (1 << i)); 045 /* Ascii 219 => dark carret, Ascii 177 = 055 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 046 unsigned char ascii_code = bit_i?219:177 056 unsigned char ascii_code = bit_i?219:177; 047 sos_x86_videomem_putchar(row, col++, 057 sos_x86_videomem_putchar(row, col++, 048 attribute, 058 attribute, 049 ascii_code); 059 ascii_code); 050 } 060 } 051 } 061 } 052 062 053 063 054 /* Clock IRQ handler */ 064 /* Clock IRQ handler */ 055 static void clk_it(int intid) 065 static void clk_it(int intid) 056 { 066 { 057 static sos_ui32_t clock_count = 0; 067 static sos_ui32_t clock_count = 0; 058 068 059 display_bits(0, 48, 069 display_bits(0, 48, 060 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 070 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 061 clock_count); 071 clock_count); 062 clock_count++; 072 clock_count++; 063 073 >> 074 /* Execute the expired timeout actions (if any) */ >> 075 sos_time_do_tick(); >> 076 >> 077 /* Update scheduler statistics and status */ >> 078 sos_sched_do_timer_tick(); 064 } 079 } 065 080 066 /* Division by zero exception handler */ !! 081 067 static void divide_ex(int exid) !! 082 /* ====================================================================== >> 083 * Page fault exception handling >> 084 */ >> 085 >> 086 >> 087 /* Page fault exception handler with demand paging for the kernel */ >> 088 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 068 { 089 { 069 static sos_ui32_t div_count = 0; !! 090 static sos_ui32_t demand_paging_count = 0; >> 091 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); >> 092 sos_paddr_t ppage_paddr; >> 093 >> 094 if (sos_cpu_context_is_in_user_mode(ctxt)) >> 095 { >> 096 /* User-mode page faults are considered unresolved for the >> 097 moment */ >> 098 sos_bochs_printf("Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\n", >> 099 sos_cpu_context_get_PC(ctxt), >> 100 (unsigned)faulting_vaddr, >> 101 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 102 sos_bochs_printf("Terminating User thread\n"); >> 103 sos_thread_exit(); >> 104 } >> 105 >> 106 /* Check if address is covered by any VMM range */ >> 107 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) >> 108 { >> 109 /* No: The page fault is out of any kernel virtual region. For >> 110 the moment, we don't handle this. */ >> 111 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", >> 112 sos_cpu_context_get_PC(ctxt), >> 113 (unsigned)faulting_vaddr, >> 114 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 115 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); >> 116 } >> 117 >> 118 >> 119 /* >> 120 * Demand paging in kernel space >> 121 */ >> 122 >> 123 /* Update the number of demand paging requests handled */ >> 124 demand_paging_count ++; 070 display_bits(0, 0, 125 display_bits(0, 0, 071 SOS_X86_VIDEO_FG_LTRED | SOS_X8 126 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 072 div_count); !! 127 demand_paging_count); 073 div_count++; !! 128 >> 129 /* Allocate a new page for the virtual address */ >> 130 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); >> 131 if (! ppage_paddr) >> 132 SOS_ASSERT_FATAL(! "TODO: implement swap. (Out of mem in demand paging because no swap for kernel yet !)"); >> 133 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, >> 134 SOS_PAGE_ALIGN_INF(faulting_vaddr), >> 135 FALSE, >> 136 SOS_VM_MAP_PROT_READ >> 137 | SOS_VM_MAP_PROT_WRITE >> 138 | SOS_VM_MAP_ATOMIC)); >> 139 sos_physmem_unref_physpage(ppage_paddr); >> 140 >> 141 /* Ok, we can now return to interrupted context */ >> 142 } >> 143 >> 144 >> 145 /* ====================================================================== >> 146 * Demonstrate the use of SOS kernel threads >> 147 * - Kernel Threads are created with various priorities and their >> 148 * state is printed on both the console and the bochs' 0xe9 port >> 149 * - For tests regarding threads' synchronization, see mouse_sim.c >> 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*)arg; >> 165 int progress = 0; >> 166 >> 167 sos_bochs_printf("start %c", thr_arg->character); >> 168 while (1) >> 169 { >> 170 progress ++; >> 171 display_bits(thr_arg->row, thr_arg->col+1, thr_arg->color, progress); >> 172 >> 173 sos_bochs_putchar(thr_arg->character); >> 174 >> 175 /* Yield the CPU to another thread sometimes... */ >> 176 if ((random() % 100) == 0) >> 177 { >> 178 sos_bochs_printf("[37myield(%c)[m\n", thr_arg->character); >> 179 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'Y'); >> 180 SOS_ASSERT_FATAL(SOS_OK == sos_thread_yield()); >> 181 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); >> 182 } >> 183 >> 184 /* Go to sleep some other times... */ >> 185 else if ((random() % 200) == 0) >> 186 { >> 187 struct sos_time t = (struct sos_time){ .sec=0, .nanosec=50000000 }; >> 188 sos_bochs_printf("[37msleep1(%c)[m\n", thr_arg->character); >> 189 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 's'); >> 190 SOS_ASSERT_FATAL(SOS_OK == sos_thread_sleep(& t)); >> 191 SOS_ASSERT_FATAL(sos_time_is_zero(& t)); >> 192 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); >> 193 } >> 194 >> 195 /* Go to sleep for a longer time some other times... */ >> 196 else if ((random() % 300) == 0) >> 197 { >> 198 struct sos_time t = (struct sos_time){ .sec=0, .nanosec=300000000 }; >> 199 sos_bochs_printf("[37msleep2(%c)[m\n", thr_arg->character); >> 200 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'S'); >> 201 SOS_ASSERT_FATAL(SOS_OK == sos_thread_sleep(& t)); >> 202 SOS_ASSERT_FATAL(sos_time_is_zero(& t)); >> 203 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); >> 204 } >> 205 >> 206 /* Infinite loop otherwise */ >> 207 } 074 } 208 } 075 209 076 /* The C entry point of our operating system * !! 210 >> 211 static void test_thread() >> 212 { >> 213 /* "static" variables because we want them to remain even when the >> 214 function returns */ >> 215 static struct thr_arg arg_b, arg_c, arg_d, arg_e, arg_R, arg_S; >> 216 sos_ui32_t flags; >> 217 >> 218 sos_disable_IRQs(flags); >> 219 >> 220 arg_b = (struct thr_arg) { .character='b', .col=0, .row=21, .color=0x14 }; >> 221 sos_create_kernel_thread("YO[b]", demo_thread, (void*)&arg_b, SOS_SCHED_PRIO_TS_LOWEST); >> 222 >> 223 arg_c = (struct thr_arg) { .character='c', .col=46, .row=21, .color=0x14 }; >> 224 sos_create_kernel_thread("YO[c]", demo_thread, (void*)&arg_c, SOS_SCHED_PRIO_TS_LOWEST); >> 225 >> 226 arg_d = (struct thr_arg) { .character='d', .col=0, .row=20, .color=0x14 }; >> 227 sos_create_kernel_thread("YO[d]", demo_thread, (void*)&arg_d, SOS_SCHED_PRIO_TS_LOWEST-1); >> 228 >> 229 arg_e = (struct thr_arg) { .character='e', .col=0, .row=19, .color=0x14 }; >> 230 sos_create_kernel_thread("YO[e]", demo_thread, (void*)&arg_e, SOS_SCHED_PRIO_TS_LOWEST-2); >> 231 >> 232 arg_R = (struct thr_arg) { .character='R', .col=0, .row=17, .color=0x1c }; >> 233 sos_create_kernel_thread("YO[R]", demo_thread, (void*)&arg_R, SOS_SCHED_PRIO_RT_LOWEST); >> 234 >> 235 arg_S = (struct thr_arg) { .character='S', .col=0, .row=16, .color=0x1c }; >> 236 sos_create_kernel_thread("YO[S]", demo_thread, (void*)&arg_S, SOS_SCHED_PRIO_RT_LOWEST-1); >> 237 >> 238 sos_restore_IRQs(flags); >> 239 } >> 240 >> 241 >> 242 /* ====================================================================== >> 243 * An operating system MUST always have a ready thread ! Otherwise: >> 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 "Invalid opcode" CPU >> 253 exception (old 80386 CPU) */ >> 254 asm("hlt\n"); >> 255 >> 256 idle_twiddle ++; >> 257 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, >> 258 idle_twiddle); >> 259 >> 260 /* Lend the CPU to some other thread */ >> 261 sos_thread_yield(); >> 262 } >> 263 } >> 264 >> 265 >> 266 /* ====================================================================== >> 267 * Kernel thread showing some CPU usage statistics on the console every 1s >> 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 following computation */ >> 285 sos_load_get_sload(&load1, &load5, &load15); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 291 "Kernel (- Idle): %s %s %s ", >> 292 str1, str5, str15); >> 293 >> 294 sos_load_get_uload(&load1, &load5, &load15); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 300 "User: %s %s %s ", >> 301 str1, str5, str15); >> 302 >> 303 sos_load_get_uratio(&load1, &load5, &load15); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 309 "User CPU %%: %s %s %s ", >> 310 str1, str5, str15); >> 311 >> 312 /* The IDLE task is INcluded in the following computation */ >> 313 sos_load_get_sratio(&load1, &load5, &load15); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 319 "Kernel CPU %% (+ Idle): %s %s %s ", >> 320 str1, str5, str15); >> 321 sos_restore_IRQs(flags); >> 322 } >> 323 } >> 324 >> 325 >> 326 /* ====================================================================== >> 327 * The C entry point of our operating system >> 328 */ 077 void sos_main(unsigned long magic, unsigned lo 329 void sos_main(unsigned long magic, unsigned long addr) 078 { 330 { 079 unsigned i; 331 unsigned i; >> 332 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; >> 333 struct sos_time tick_resolution; 080 334 081 /* Grub sends us a structure, called multibo 335 /* Grub sends us a structure, called multiboot_info_t with a lot of 082 precious informations about the system, s 336 precious informations about the system, see the multiboot 083 documentation for more information. */ 337 documentation for more information. */ 084 multiboot_info_t *mbi; 338 multiboot_info_t *mbi; 085 mbi = (multiboot_info_t *) addr; 339 mbi = (multiboot_info_t *) addr; 086 340 087 /* Setup bochs and console, and clear the co 341 /* Setup bochs and console, and clear the console */ 088 sos_bochs_setup(); 342 sos_bochs_setup(); 089 343 090 sos_x86_videomem_setup(); 344 sos_x86_videomem_setup(); 091 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 345 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 092 346 093 /* Greetings from SOS */ 347 /* Greetings from SOS */ 094 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 348 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 095 /* Loaded with Grub */ 349 /* Loaded with Grub */ 096 sos_x86_videomem_printf(1, 0, 350 sos_x86_videomem_printf(1, 0, 097 SOS_X86_VIDEO_FG_Y 351 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 098 "Welcome From GRUB 352 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 099 "SOS", ',', !! 353 "SOS article 7", ',', 100 (unsigned)(mbi->me 354 (unsigned)(mbi->mem_upper >> 10) + 1, 101 (unsigned)mbi->mem 355 (unsigned)mbi->mem_upper); 102 else 356 else 103 /* Not loaded with grub */ 357 /* Not loaded with grub */ 104 sos_x86_videomem_printf(1, 0, 358 sos_x86_videomem_printf(1, 0, 105 SOS_X86_VIDEO_FG_Y 359 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 106 "Welcome to SOS"); !! 360 "Welcome to SOS article 7"); 107 361 108 sos_bochs_putstring("Message in a bochs\n"); !! 362 sos_bochs_putstring("Message in a bochs: This is SOS article 7.\n"); 109 363 110 /* Setup CPU segmentation and IRQ subsystem 364 /* Setup CPU segmentation and IRQ subsystem */ 111 sos_gdt_setup(); !! 365 sos_gdt_subsystem_setup(); 112 sos_idt_setup(); !! 366 sos_idt_subsystem_setup(); 113 367 114 /* Setup SOS IRQs and exceptions subsystem * 368 /* Setup SOS IRQs and exceptions subsystem */ 115 sos_exceptions_setup(); !! 369 sos_exception_subsystem_setup(); 116 sos_irq_setup(); !! 370 sos_irq_subsystem_setup(); 117 371 118 /* Configure the timer so as to raise the IR 372 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 119 sos_i8254_set_frequency(100); 373 sos_i8254_set_frequency(100); 120 374 121 /* Binding some HW interrupts and exceptions !! 375 /* Setup the kernel time subsystem to get prepared to take the timer 122 sos_irq_set_routine(SOS_IRQ_TIMER, !! 376 ticks into account */ 123 clk_it); !! 377 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 124 sos_exception_set_routine(SOS_EXCEPT_DIVIDE_ !! 378 sos_time_subsysem_setup(& tick_resolution); 125 divide_ex); << 126 /* Enabling the HW interrupts here, this wil << 127 interrupt call our clk_it handler */ << 128 asm volatile ("sti\n"); << 129 379 130 /* Raise a rafale of 'division by 0' excepti !! 380 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 131 not really needed (equivalent to a bare " !! 381 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 132 compiling with -O3: "i=1/0;" is considere << 133 -O3. */ << 134 i = 10; << 135 while (1) << 136 { 382 { 137 /* Stupid function call to fool gcc opti !! 383 sos_x86_videomem_putstring(20, 0, 138 sos_bochs_printf("i = 1 / %d...\n", i); !! 384 SOS_X86_VIDEO_FG_LTRED 139 i = 1 / i; !! 385 | SOS_X86_VIDEO_BG_BLUE >> 386 | SOS_X86_VIDEO_FG_BLINKING, >> 387 "I'm not loaded with Grub !"); >> 388 /* STOP ! */ >> 389 for (;;) >> 390 continue; 140 } 391 } 141 392 142 /* Will never print this since the "divide b !! 393 /* 143 returns to the faulting instruction (see !! 394 * Some interrupt handlers 144 section 5.12), thus re-evaluating the "di !! 395 */ 145 and raising the "divide by zero" exceptio !! 396 146 sos_x86_videomem_putstring(2, 0, !! 397 /* Binding some HW interrupts and exceptions to software routines */ 147 SOS_X86_VIDEO_FG_ !! 398 sos_irq_set_routine(SOS_IRQ_TIMER, 148 "Invisible"); !! 399 clk_it); >> 400 >> 401 /* >> 402 * Setup physical memory management >> 403 */ >> 404 >> 405 /* Multiboot says: "The value returned for upper memory is maximally >> 406 the address of the first upper memory hole minus 1 megabyte.". It >> 407 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ >> 408 sos_physmem_subsystem_setup((mbi->mem_upper<<10) + (1<<20), >> 409 & sos_kernel_core_base_paddr, >> 410 & sos_kernel_core_top_paddr); >> 411 >> 412 /* >> 413 * Switch to paged-memory mode >> 414 */ >> 415 >> 416 /* Disabling interrupts should seem more correct, but it's not really >> 417 necessary at this stage */ >> 418 SOS_ASSERT_FATAL(SOS_OK == >> 419 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, >> 420 sos_kernel_core_top_paddr)); >> 421 >> 422 /* Bind the page fault exception */ >> 423 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, >> 424 pgflt_ex); >> 425 >> 426 /* >> 427 * Setup kernel virtual memory allocator >> 428 */ >> 429 >> 430 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, >> 431 sos_kernel_core_top_paddr, >> 432 bootstrap_stack_bottom, >> 433 bootstrap_stack_bottom >> 434 + bootstrap_stack_size)) >> 435 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); >> 436 >> 437 if (sos_kmalloc_subsystem_setup()) >> 438 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); >> 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 interrupt handler >> 452 */ >> 453 sos_swintr_subsystem_setup(); >> 454 >> 455 >> 456 /* >> 457 * Initialize the Kernel thread and scheduler subsystems >> 458 */ >> 459 >> 460 /* Initialize kernel thread subsystem */ >> 461 sos_thread_subsystem_setup(bootstrap_stack_bottom, >> 462 bootstrap_stack_size); >> 463 >> 464 /* Initialize the scheduler */ >> 465 sos_sched_subsystem_setup(); >> 466 >> 467 /* Declare the IDLE thread */ >> 468 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, >> 469 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 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("stat_thread", stat_thread, >> 476 NULL, >> 477 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 478 >> 479 >> 480 /* >> 481 * Initialize process stuff >> 482 */ >> 483 sos_process_subsystem_setup(); >> 484 >> 485 >> 486 /* Enabling the HW interrupts here, this will make the timer HW >> 487 interrupt call the scheduler */ >> 488 asm volatile ("sti\n"); 149 489 150 return; !! 490 /* Run some tests involving USER processes and threads */ >> 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, for there is already >> 501 * an idle Kernel thread ready to make the CPU busy working... >> 502 * >> 503 * However, we must EXPLICITELY call sos_thread_exit() because a >> 504 * simple "return" will return nowhere ! Actually this first thread >> 505 * was initialized by the Grub bootstrap stage, at a time when the >> 506 * word "thread" did not exist. This means that the stack was not >> 507 * setup in order for a return here to call sos_thread_exit() >> 508 * automagically. Hence we must call it manually. This is the ONLY >> 509 * kernel thread where we must do this manually. >> 510 */ >> 511 sos_bochs_printf("Bye from primary thread !\n"); >> 512 sos_thread_exit(); >> 513 SOS_FATAL_ERROR("No trespassing !"); 151 } 514 }
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