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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 >> 019 #include <sos/errno.h> >> 020 020 /* Include definitions of the multiboot standa 021 /* Include definitions of the multiboot standard */ 021 #include <bootstrap/multiboot.h> 022 #include <bootstrap/multiboot.h> 022 #include <hwcore/idt.h> 023 #include <hwcore/idt.h> 023 #include <hwcore/gdt.h> 024 #include <hwcore/gdt.h> 024 #include <hwcore/irq.h> 025 #include <hwcore/irq.h> 025 #include <hwcore/exception.h> 026 #include <hwcore/exception.h> 026 #include <hwcore/i8254.h> 027 #include <hwcore/i8254.h> 027 #include <sos/list.h> 028 #include <sos/list.h> 028 #include <sos/physmem.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> 029 #include <sos/klibc.h> 039 #include <sos/klibc.h> 030 #include <sos/assert.h> 040 #include <sos/assert.h> 031 #include <drivers/x86_videomem.h> 041 #include <drivers/x86_videomem.h> 032 #include <drivers/bochs.h> 042 #include <drivers/bochs.h> 033 !! 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> 034 049 035 /* Helper function to display each bits of a 3 050 /* Helper function to display each bits of a 32bits integer on the 036 screen as dark or light carrets */ 051 screen as dark or light carrets */ 037 static void display_bits(unsigned char row, un !! 052 void display_bits(unsigned char row, unsigned char col, 038 unsigned char attribu !! 053 unsigned char attribute, 039 sos_ui32_t integer) !! 054 sos_ui32_t integer) 040 { 055 { 041 int i; 056 int i; 042 /* Scan each bit of the integer, MSb first * 057 /* Scan each bit of the integer, MSb first */ 043 for (i = 31 ; i >= 0 ; i--) 058 for (i = 31 ; i >= 0 ; i--) 044 { 059 { 045 /* Test if bit i of 'integer' is set */ 060 /* Test if bit i of 'integer' is set */ 046 int bit_i = (integer & (1 << i)); 061 int bit_i = (integer & (1 << i)); 047 /* Ascii 219 => dark carret, Ascii 177 = 062 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 048 unsigned char ascii_code = bit_i?219:177 063 unsigned char ascii_code = bit_i?219:177; 049 sos_x86_videomem_putchar(row, col++, 064 sos_x86_videomem_putchar(row, col++, 050 attribute, 065 attribute, 051 ascii_code); 066 ascii_code); 052 } 067 } 053 } 068 } 054 069 055 << 056 /* Clock IRQ handler */ 070 /* Clock IRQ handler */ 057 static void clk_it(int intid) 071 static void clk_it(int intid) 058 { 072 { 059 static sos_ui32_t clock_count = 0; 073 static sos_ui32_t clock_count = 0; 060 074 061 display_bits(0, 48, 075 display_bits(0, 48, 062 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 076 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 063 clock_count); 077 clock_count); 064 clock_count++; 078 clock_count++; 065 079 >> 080 /* Execute the expired timeout actions (if any) */ >> 081 sos_time_do_tick(); >> 082 >> 083 /* Update scheduler statistics and status */ >> 084 sos_sched_do_timer_tick(); 066 } 085 } 067 086 068 #define MY_PPAGE_NUM_INT 511 !! 087 069 struct my_ppage !! 088 /* ====================================================================== >> 089 * Page fault exception handling >> 090 */ >> 091 >> 092 >> 093 /* Page fault exception handler with demand paging for the kernel */ >> 094 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 070 { 095 { 071 sos_ui32_t before[MY_PPAGE_NUM_INT]; !! 096 static sos_ui32_t demand_paging_count = 0; 072 struct my_ppage *prev, *next; !! 097 struct sos_thread * cur_thr = sos_thread_get_current(); 073 sos_ui32_t after[MY_PPAGE_NUM_INT]; !! 098 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 074 }; /* sizeof() Must be <= 4kB */ !! 099 sos_paddr_t ppage_paddr; 075 !! 100 076 static void test_physmem() !! 101 if (sos_cpu_context_is_in_user_mode(ctxt) 077 { !! 102 || (cur_thr->fixup_uaccess.return_vaddr)) 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_p << 081 << 082 ppage_list = NULL; << 083 while ((my_ppage = (struct my_ppage*)sos_phy << 084 != NULL) << 085 { 103 { 086 int i; !! 104 __label__ unforce_address_space; 087 num_alloc_ppages++; !! 105 sos_bool_t need_to_setup_mmu; 088 !! 106 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); 089 /* Print the allocation status */ !! 107 090 sos_x86_videomem_printf(2, 0, !! 108 /* Make sure to always stay in the interrupted thread's MMU 091 SOS_X86_VIDEO_FG !! 109 configuration */ 092 | SOS_X86_VIDEO_ !! 110 need_to_setup_mmu = (cur_thr->squatted_mm_context 093 "Could allocate !! 111 != sos_process_get_mm_context(cur_thr->process)); 094 num_alloc_ppages !! 112 if (need_to_setup_mmu) 095 !! 113 sos_thread_prepare_user_space_access(NULL, 0); 096 /* We fill this page with its address */ !! 114 097 for (i = 0 ; i < MY_PPAGE_NUM_INT ; i++) !! 115 if (SOS_OK == 098 my_ppage->before[i] = my_ppage->after[ !! 116 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, 099 !! 117 errcode & (1 << 1), 100 /* We add this page at the tail of our l !! 118 TRUE)) 101 list_add_tail(ppage_list, my_ppage); !! 119 goto unforce_address_space; 102 } !! 120 103 !! 121 /* If the page fault occured in kernel mode, return to kernel to 104 /* Now we release these pages in FIFO order !! 122 the fixup address */ 105 while ((my_ppage = list_pop_head(ppage_list) !! 123 if (! sos_cpu_context_is_in_user_mode(ctxt)) 106 { << 107 /* We make sure this page was not overwr << 108 value */ << 109 int i; << 110 for (i = 0 ; i < MY_PPAGE_NUM_INT ; i++) << 111 { 124 { 112 /* We don't get what we expect ! */ !! 125 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; 113 if ((my_ppage->before[i] != (sos_ui !! 126 sos_cpu_context_set_EX_return_address(ctxt, 114 || (my_ppage->after[i] != (sos_ !! 127 cur_thr->fixup_uaccess.return_vaddr); 115 { !! 128 goto unforce_address_space; 116 /* STOP ! */ << 117 sos_x86_videomem_putstring(20, 0 << 118 SOS_X << 119 | S << 120 "Page << 121 return; << 122 } << 123 } 129 } 124 130 125 /* Release the descriptor */ !! 131 if (need_to_setup_mmu) 126 if (sos_physmem_unref_physpage((sos_padd !! 132 sos_thread_end_user_space_access(); 127 { !! 133 128 /* STOP ! */ !! 134 sos_bochs_printf("Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\n", 129 sos_x86_videomem_putstring(20, 0, !! 135 sos_cpu_context_get_PC(ctxt), 130 SOS_X86_V !! 136 (unsigned)faulting_vaddr, 131 | SOS_X !! 137 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 132 "Cannot r !! 138 sos_bochs_printf("Terminating User thread\n"); 133 return; !! 139 sos_thread_exit(); 134 } !! 140 >> 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 range */ >> 148 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) >> 149 { >> 150 /* No: The page fault is out of any kernel virtual region. For >> 151 the moment, we don't handle this. */ >> 152 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", >> 153 sos_cpu_context_get_PC(ctxt), >> 154 (unsigned)faulting_vaddr, >> 155 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 156 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); >> 157 } 135 158 136 /* Print the deallocation status */ !! 159 137 num_free_ppages ++; !! 160 /* 138 sos_x86_videomem_printf(2, 0, !! 161 * Demand paging in kernel space 139 SOS_X86_VIDEO_FG !! 162 */ 140 | SOS_X86_VIDEO_ !! 163 141 "Could free %d p !! 164 /* Update the number of demand paging requests handled */ 142 num_free_ppages) !! 165 demand_paging_count ++; >> 166 display_bits(0, 0, >> 167 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, >> 168 demand_paging_count); >> 169 >> 170 /* Allocate a new page for the virtual address */ >> 171 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); >> 172 if (! ppage_paddr) >> 173 SOS_ASSERT_FATAL(! "TODO: implement swap. (Out of mem in demand paging because no swap for kernel yet !)"); >> 174 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, >> 175 SOS_PAGE_ALIGN_INF(faulting_vaddr), >> 176 FALSE, >> 177 SOS_VM_MAP_PROT_READ >> 178 | SOS_VM_MAP_PROT_WRITE >> 179 | SOS_VM_MAP_ATOMIC)); >> 180 sos_physmem_unref_physpage(ppage_paddr); >> 181 >> 182 /* Ok, we can now return to interrupted context */ >> 183 } >> 184 >> 185 >> 186 >> 187 /* ====================================================================== >> 188 * An operating system MUST always have a ready thread ! Otherwise: >> 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 "Invalid opcode" CPU >> 198 exception (old 80386 CPU) */ >> 199 asm("hlt\n"); >> 200 >> 201 idle_twiddle ++; >> 202 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, >> 203 idle_twiddle); >> 204 >> 205 /* Lend the CPU to some other thread */ >> 206 sos_thread_yield(); 143 } 207 } >> 208 } 144 209 145 /* Print the overall stats */ << 146 sos_x86_videomem_printf(2, 0, << 147 SOS_X86_VIDEO_FG_LTG << 148 | SOS_X86_VIDEO_BG_B << 149 "Could allocate %d b << 150 num_alloc_ppages << << 151 num_free_ppages << S << 152 210 153 SOS_ASSERT_FATAL(num_alloc_ppages == num_fre !! 211 /* ====================================================================== >> 212 * Kernel thread showing some CPU usage statistics on the console every 1s >> 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 following computation */ >> 230 sos_load_get_sload(&load1, &load5, &load15); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 236 "Kernel (- Idle): %s %s %s ", >> 237 str1, str5, str15); >> 238 >> 239 sos_load_get_uload(&load1, &load5, &load15); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 245 "User: %s %s %s ", >> 246 str1, str5, str15); >> 247 >> 248 sos_load_get_uratio(&load1, &load5, &load15); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 254 "User CPU %%: %s %s %s ", >> 255 str1, str5, str15); >> 256 >> 257 /* The IDLE task is INcluded in the following computation */ >> 258 sos_load_get_sratio(&load1, &load5, &load15); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 264 "Kernel CPU %% (+ Idle): %s %s %s ", >> 265 str1, str5, str15); >> 266 sos_restore_IRQs(flags); >> 267 } 154 } 268 } 155 269 156 270 157 /* The C entry point of our operating system * !! 271 /* ====================================================================== 158 void sos_main(unsigned long magic, unsigned lo !! 272 * Start the "init" (userland) process >> 273 */ >> 274 static sos_ret_t >> 275 start_init(struct sos_fs_manager_instance * rootfs) >> 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, * init_cwd, * unused_of; >> 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_init); >> 289 >> 290 >> 291 /* >> 292 * Setup the root and CWD directories of the process. The root of >> 293 * this process will correspond to the "global" root of the whole >> 294 * system since all the future processes will duplicate it ! >> 295 */ >> 296 retval = sos_fs_new_opened_file(proc_init, rootfs->root, >> 297 SOS_FS_OPEN_READ | SOS_FS_OPEN_WRITE, >> 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 current working directory of >> 306 the init process */ >> 307 retval = sos_fs_duplicate_opened_file(init_root, proc_init, >> 308 & init_cwd); >> 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_init, init_root, & unused_of) ) >> 318 || ( SOS_OK != sos_process_chdir(proc_init, init_cwd, & unused_of) ) ) >> 319 { >> 320 sos_fs_close(init_root); >> 321 sos_fs_close(init_cwd); >> 322 sos_process_chroot(proc_init, NULL, & unused_of); >> 323 sos_process_chdir(proc_init, NULL, & unused_of); >> 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, "init"); >> 330 if (0 == start_uaddr) >> 331 { >> 332 sos_process_unref(proc_init); >> 333 return -SOS_ENOENT; >> 334 } >> 335 >> 336 /* Allocate the user stack */ >> 337 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; >> 338 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, >> 339 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, >> 340 /* PRIVATE */ 0); >> 341 if (SOS_OK != retval) >> 342 { >> 343 sos_process_unref(proc_init); >> 344 return -SOS_ENOMEM; >> 345 } >> 346 >> 347 /* Now create the user thread */ >> 348 new_thr = sos_create_user_thread(NULL, >> 349 proc_init, >> 350 start_uaddr, >> 351 0, 0, >> 352 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, >> 353 SOS_SCHED_PRIO_TS_LOWEST); >> 354 if (! new_thr) >> 355 { >> 356 sos_process_unref(proc_init); >> 357 return -SOS_ENOMEM; >> 358 } >> 359 >> 360 sos_process_unref(proc_init); >> 361 return SOS_OK; >> 362 } >> 363 >> 364 >> 365 /* ====================================================================== >> 366 * The C entry point of our operating system >> 367 */ >> 368 void sos_main(unsigned long magic, unsigned long arg) 159 { 369 { 160 unsigned i; 370 unsigned i; 161 sos_paddr_t sos_kernel_core_base_paddr, sos_ 371 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; 162 374 163 /* Grub sends us a structure, called multibo !! 375 /* Size of RAM above 1MB. Might be undefined ! */ 164 precious informations about the system, s !! 376 unsigned long int upper_mem = 0; 165 documentation for more information. */ << 166 multiboot_info_t *mbi; << 167 mbi = (multiboot_info_t *) addr; << 168 377 169 /* Setup bochs and console, and clear the co 378 /* Setup bochs and console, and clear the console */ 170 sos_bochs_setup(); 379 sos_bochs_setup(); 171 380 172 sos_x86_videomem_setup(); 381 sos_x86_videomem_setup(); 173 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 382 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 174 383 175 /* Greetings from SOS */ 384 /* Greetings from SOS */ 176 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 385 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 177 /* Loaded with Grub */ !! 386 { 178 sos_x86_videomem_printf(1, 0, !! 387 /* Grub sends us a structure, called multiboot_info_t with a lot of 179 SOS_X86_VIDEO_FG_Y !! 388 precious informations about the system, see the multiboot 180 "Welcome From GRUB !! 389 documentation for more information. */ 181 "SOS", ',', !! 390 multiboot_info_t *mbi = (multiboot_info_t *) arg; 182 (unsigned)(mbi->me !! 391 183 (unsigned)mbi->mem !! 392 /* Multiboot says: "The value returned for upper memory is >> 393 maximally the address of the first upper memory hole minus 1 >> 394 megabyte.". It also adds: "It is not guaranteed to be this >> 395 value." aka "YMMV" ;) */ >> 396 upper_mem = mbi->mem_upper; >> 397 sos_x86_videomem_printf(1, 0, >> 398 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 399 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 400 "SOS article 8", ',', >> 401 (unsigned)(upper_mem >> 10) + 1, >> 402 (unsigned)upper_mem); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 410 "Welcome to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 411 "SOS article 8", ',', >> 412 (unsigned)(upper_mem >> 10) + 1, >> 413 (unsigned)upper_mem); >> 414 } 184 else 415 else 185 /* Not loaded with grub */ !! 416 /* Not loaded with grub, not from an enhanced bootsect */ 186 sos_x86_videomem_printf(1, 0, 417 sos_x86_videomem_printf(1, 0, 187 SOS_X86_VIDEO_FG_Y 418 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 188 "Welcome to SOS"); !! 419 "Welcome to SOS article 8"); 189 420 190 sos_bochs_putstring("Message in a bochs\n"); !! 421 sos_bochs_putstring("Message in a bochs: This is SOS article 8.\n"); 191 422 192 /* Setup CPU segmentation and IRQ subsystem 423 /* Setup CPU segmentation and IRQ subsystem */ 193 sos_gdt_setup(); !! 424 sos_gdt_subsystem_setup(); 194 sos_idt_setup(); !! 425 sos_idt_subsystem_setup(); 195 426 196 /* Setup SOS IRQs and exceptions subsystem * 427 /* Setup SOS IRQs and exceptions subsystem */ 197 sos_exceptions_setup(); !! 428 sos_exception_subsystem_setup(); 198 sos_irq_setup(); !! 429 sos_irq_subsystem_setup(); 199 430 200 /* Configure the timer so as to raise the IR 431 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 201 sos_i8254_set_frequency(100); 432 sos_i8254_set_frequency(100); 202 433 >> 434 /* Setup the kernel time subsystem to get prepared to take the timer >> 435 ticks into account */ >> 436 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; >> 437 sos_time_subsysem_setup(& tick_resolution); 203 438 204 /* We need a multiboot-compliant boot loader !! 439 /* We need to know the RAM size */ 205 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) !! 440 if (upper_mem == 0) 206 { 441 { 207 sos_x86_videomem_putstring(20, 0, 442 sos_x86_videomem_putstring(20, 0, 208 SOS_X86_VIDEO 443 SOS_X86_VIDEO_FG_LTRED 209 | SOS_X86_V 444 | SOS_X86_VIDEO_BG_BLUE 210 | SOS_X86_V 445 | SOS_X86_VIDEO_FG_BLINKING, 211 "I'm not load !! 446 "I don't know RAM size ! Load me with Grub..."); 212 /* STOP ! */ 447 /* STOP ! */ 213 for (;;) 448 for (;;) 214 continue; 449 continue; 215 } 450 } 216 451 >> 452 /* >> 453 * Some interrupt handlers >> 454 */ >> 455 217 /* Binding some HW interrupts and exceptions 456 /* Binding some HW interrupts and exceptions to software routines */ 218 sos_irq_set_routine(SOS_IRQ_TIMER, 457 sos_irq_set_routine(SOS_IRQ_TIMER, 219 clk_it); !! 458 clk_it); >> 459 >> 460 /* >> 461 * Setup physical memory management >> 462 */ >> 463 >> 464 SOS_ASSERT_FATAL(SOS_OK >> 465 == sos_physmem_subsystem_setup((upper_mem<<10) + (1<<20), >> 466 &sos_kernel_core_base_paddr, >> 467 &sos_kernel_core_top_paddr)); >> 468 >> 469 /* >> 470 * Switch to paged-memory mode >> 471 */ >> 472 >> 473 /* Disabling interrupts should seem more correct, but it's not really >> 474 necessary at this stage */ >> 475 SOS_ASSERT_FATAL(SOS_OK == >> 476 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, >> 477 sos_kernel_core_top_paddr)); >> 478 >> 479 /* Bind the page fault exception */ >> 480 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, >> 481 pgflt_ex); >> 482 >> 483 /* >> 484 * Setup kernel virtual memory allocator >> 485 */ >> 486 >> 487 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, >> 488 sos_kernel_core_top_paddr, >> 489 bootstrap_stack_bottom, >> 490 bootstrap_stack_bottom >> 491 + bootstrap_stack_size)) >> 492 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); >> 493 >> 494 if (sos_kmalloc_subsystem_setup()) >> 495 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); >> 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 interrupt handler >> 509 */ >> 510 sos_swintr_subsystem_setup(); >> 511 >> 512 >> 513 /* >> 514 * Initialize the Kernel thread and scheduler subsystems >> 515 */ >> 516 >> 517 /* Initialize kernel thread subsystem */ >> 518 sos_thread_subsystem_setup(bootstrap_stack_bottom, >> 519 bootstrap_stack_size); >> 520 >> 521 /* Initialize the scheduler */ >> 522 sos_sched_subsystem_setup(); >> 523 >> 524 /* Declare the IDLE thread */ >> 525 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, >> 526 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 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("stat_thread", stat_thread, >> 533 NULL, >> 534 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 535 >> 536 >> 537 /* >> 538 * Initialise user address space management subsystem >> 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 >> 548 220 /* Enabling the HW interrupts here, this wil 549 /* Enabling the HW interrupts here, this will make the timer HW 221 interrupt call our clk_it handler */ !! 550 interrupt call the scheduler */ 222 asm volatile ("sti\n"); 551 asm volatile ("sti\n"); 223 /* Multiboot says: "The value returned for u << 224 the address of the first upper memory hol << 225 also adds: "It is not guaranteed to be th << 226 sos_physmem_setup((mbi->mem_upper<<10) + (1< << 227 & sos_kernel_core_base_pad << 228 & sos_kernel_core_top_padd << 229 test_physmem(); << 230 << 231 /* An operatig system never ends */ << 232 for (;;) << 233 continue; << 234 552 235 return; !! 553 >> 554 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_subsystem_setup()); >> 555 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_setup(NULL, >> 556 "virtfs", >> 557 NULL, >> 558 & rootfs)); >> 559 >> 560 >> 561 /* Start the 'init' process, which in turns launches the other >> 562 programs */ >> 563 start_init(rootfs); >> 564 /* >> 565 * We can safely exit from this function now, for there is already >> 566 * an idle Kernel thread ready to make the CPU busy working... >> 567 * >> 568 * However, we must EXPLICITELY call sos_thread_exit() because a >> 569 * simple "return" will return nowhere ! Actually this first thread >> 570 * was initialized by the Grub bootstrap stage, at a time when the >> 571 * word "thread" did not exist. This means that the stack was not >> 572 * setup in order for a return here to call sos_thread_exit() >> 573 * automagically. Hence we must call it manually. This is the ONLY >> 574 * kernel thread where we must do this manually. >> 575 */ >> 576 sos_bochs_printf("Bye from primary thread !\n"); >> 577 sos_thread_exit(); >> 578 SOS_FATAL_ERROR("No trespassing !"); 236 } 579 }
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