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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> 029 #include <hwcore/paging.h> 030 #include <hwcore/paging.h> >> 031 #include <hwcore/mm_context.h> >> 032 #include <hwcore/swintr.h> 030 #include <sos/kmem_vmm.h> 033 #include <sos/kmem_vmm.h> 031 #include <sos/kmalloc.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> 032 #include <sos/klibc.h> 039 #include <sos/klibc.h> 033 #include <sos/assert.h> 040 #include <sos/assert.h> 034 #include <drivers/x86_videomem.h> 041 #include <drivers/x86_videomem.h> 035 #include <drivers/bochs.h> 042 #include <drivers/bochs.h> 036 !! 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> >> 049 #include <drivers/devices.h> >> 050 #include <drivers/mem.h> >> 051 #include <drivers/tty.h> >> 052 #include <drivers/console.h> >> 053 #include <drivers/serial.h> 037 054 038 /* Helper function to display each bits of a 3 055 /* Helper function to display each bits of a 32bits integer on the 039 screen as dark or light carrets */ 056 screen as dark or light carrets */ 040 static void display_bits(unsigned char row, un !! 057 void display_bits(unsigned char row, unsigned char col, 041 unsigned char attribu !! 058 unsigned char attribute, 042 sos_ui32_t integer) !! 059 sos_ui32_t integer) 043 { 060 { 044 int i; 061 int i; 045 /* Scan each bit of the integer, MSb first * 062 /* Scan each bit of the integer, MSb first */ 046 for (i = 31 ; i >= 0 ; i--) 063 for (i = 31 ; i >= 0 ; i--) 047 { 064 { 048 /* Test if bit i of 'integer' is set */ 065 /* Test if bit i of 'integer' is set */ 049 int bit_i = (integer & (1 << i)); 066 int bit_i = (integer & (1 << i)); 050 /* Ascii 219 => dark carret, Ascii 177 = 067 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 051 unsigned char ascii_code = bit_i?219:177 068 unsigned char ascii_code = bit_i?219:177; 052 sos_x86_videomem_putchar(row, col++, 069 sos_x86_videomem_putchar(row, col++, 053 attribute, 070 attribute, 054 ascii_code); 071 ascii_code); 055 } 072 } 056 } 073 } 057 074 058 << 059 /* Clock IRQ handler */ 075 /* Clock IRQ handler */ 060 static void clk_it(int intid) 076 static void clk_it(int intid) 061 { 077 { 062 static sos_ui32_t clock_count = 0; 078 static sos_ui32_t clock_count = 0; 063 079 064 display_bits(0, 48, 080 display_bits(0, 48, 065 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 081 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 066 clock_count); 082 clock_count); 067 clock_count++; 083 clock_count++; 068 084 069 } !! 085 /* Execute the expired timeout actions (if any) */ 070 struct digit !! 086 sos_time_do_tick(); 071 { << 072 struct digit *prev, *next; << 073 char value; << 074 }; << 075 << 076 /* Representation of a big (positive) integer: << 077 (MSD) is the HEAD of the list. Least Signif << 078 TAIL of the list */ << 079 typedef struct digit * big_number_t; << 080 << 081 087 082 /* Add a new digit after the LSD */ !! 088 /* Update scheduler statistics and status */ 083 void bn_push_lsd(big_number_t * bn, char value !! 089 sos_sched_do_timer_tick(); 084 { << 085 struct digit *d; << 086 d = (struct digit*) sos_kmalloc(sizeof(struc << 087 SOS_ASSERT_FATAL(d != NULL); << 088 d->value = value; << 089 list_add_tail(*bn, d); << 090 } 090 } 091 091 092 092 093 /* Add a new digit before the MSD */ !! 093 /* ====================================================================== 094 void bn_push_msd(big_number_t * bn, char value !! 094 * Page fault exception handling 095 { !! 095 */ 096 struct digit *d; << 097 d = (struct digit*) sos_kmalloc(sizeof(struc << 098 SOS_ASSERT_FATAL(d != NULL); << 099 d->value = value; << 100 list_add_head(*bn, d); << 101 } << 102 096 103 097 104 /* Construct a big integer from a (machine) in !! 098 /* Page fault exception handler with demand paging for the kernel */ 105 big_number_t bn_new(unsigned long int i) !! 099 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 106 { 100 { 107 big_number_t retval; !! 101 static sos_ui32_t demand_paging_count = 0; >> 102 struct sos_thread * cur_thr = sos_thread_get_current(); >> 103 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); >> 104 sos_paddr_t ppage_paddr; 108 105 109 list_init(retval); !! 106 if (sos_cpu_context_is_in_user_mode(ctxt) 110 do !! 107 || (cur_thr->fixup_uaccess.return_vaddr)) 111 { 108 { 112 bn_push_msd(&retval, i%10); !! 109 __label__ unforce_address_space; 113 i /= 10; !! 110 sos_bool_t need_to_setup_mmu; 114 } !! 111 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); 115 while (i != 0); << 116 112 117 return retval; !! 113 /* Make sure to always stay in the interrupted thread's MMU 118 } !! 114 configuration */ >> 115 need_to_setup_mmu = (cur_thr->squatted_mm_context >> 116 != sos_process_get_mm_context(cur_thr->process)); >> 117 if (need_to_setup_mmu) >> 118 sos_thread_prepare_user_space_access(NULL, 0); 119 119 >> 120 if (SOS_OK == >> 121 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, >> 122 errcode & (1 << 1), >> 123 TRUE)) >> 124 goto unforce_address_space; 120 125 121 /* Create a new big integer from another big i !! 126 /* If the page fault occured in kernel mode, return to kernel to 122 big_number_t bn_copy(const big_number_t bn) !! 127 the fixup address */ 123 { !! 128 if (! sos_cpu_context_is_in_user_mode(ctxt)) 124 big_number_t retval; !! 129 { 125 int nb_elts; !! 130 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; 126 struct digit *d; !! 131 sos_cpu_context_set_EX_return_address(ctxt, >> 132 cur_thr->fixup_uaccess.return_vaddr); >> 133 goto unforce_address_space; >> 134 } 127 135 128 list_init(retval); !! 136 if (need_to_setup_mmu) 129 list_foreach(bn, d, nb_elts) !! 137 sos_thread_end_user_space_access(); 130 { !! 138 131 bn_push_lsd(&retval, d->value); !! 139 sos_bochs_printf("Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\n", >> 140 sos_cpu_context_get_PC(ctxt), >> 141 (unsigned)faulting_vaddr, >> 142 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 143 sos_bochs_printf("Terminating User thread\n"); >> 144 sos_thread_exit(); >> 145 >> 146 unforce_address_space: >> 147 if (need_to_setup_mmu) >> 148 sos_thread_end_user_space_access(); >> 149 return; >> 150 } >> 151 >> 152 /* Check if address is covered by any VMM range */ >> 153 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) >> 154 { >> 155 /* No: The page fault is out of any kernel virtual region. For >> 156 the moment, we don't handle this. */ >> 157 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", >> 158 sos_cpu_context_get_PC(ctxt), >> 159 (unsigned)faulting_vaddr, >> 160 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 161 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 132 } 162 } 133 163 134 return retval; << 135 } << 136 164 >> 165 /* >> 166 * Demand paging in kernel space >> 167 */ >> 168 >> 169 /* Update the number of demand paging requests handled */ >> 170 demand_paging_count ++; >> 171 display_bits(0, 0, >> 172 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, >> 173 demand_paging_count); >> 174 >> 175 /* Allocate a new page for the virtual address */ >> 176 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); >> 177 if (! ppage_paddr) >> 178 SOS_ASSERT_FATAL(! "TODO: implement swap. (Out of mem in demand paging because no swap for kernel yet !)"); >> 179 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, >> 180 SOS_PAGE_ALIGN_INF(faulting_vaddr), >> 181 FALSE, >> 182 SOS_VM_MAP_PROT_READ >> 183 | SOS_VM_MAP_PROT_WRITE >> 184 | SOS_VM_MAP_ATOMIC)); >> 185 sos_physmem_unref_physpage(ppage_paddr); >> 186 >> 187 /* Ok, we can now return to interrupted context */ >> 188 } >> 189 >> 190 >> 191 >> 192 /* ====================================================================== >> 193 * An operating system MUST always have a ready thread ! Otherwise: >> 194 * what would the CPU have to execute ?! >> 195 */ >> 196 static void idle_thread() >> 197 { >> 198 sos_ui32_t idle_twiddle = 0; >> 199 >> 200 while (1) >> 201 { >> 202 /* Remove this instruction if you get an "Invalid opcode" CPU >> 203 exception (old 80386 CPU) */ >> 204 asm("hlt\n"); >> 205 >> 206 idle_twiddle ++; >> 207 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, >> 208 idle_twiddle); >> 209 >> 210 /* Lend the CPU to some other thread */ >> 211 sos_thread_yield(); >> 212 } >> 213 } >> 214 >> 215 >> 216 /* ====================================================================== >> 217 * Kernel thread showing some CPU usage statistics on the console every 1s >> 218 */ >> 219 #define LOAD_DISPLAY_BASELINE 4 >> 220 #define LOAD_DISPLAY_STARTROW 34 >> 221 static void stat_thread() >> 222 { >> 223 while (1) >> 224 { >> 225 sos_ui32_t flags; >> 226 sos_ui32_t load1, load5, load15; >> 227 char str1[11], str5[11], str15[11]; >> 228 struct sos_time t; >> 229 t.sec = 1; >> 230 t.nanosec = 0; >> 231 >> 232 sos_thread_sleep(& t); >> 233 >> 234 sos_disable_IRQs(flags); >> 235 >> 236 /* The IDLE task is EXcluded in the following computation */ >> 237 sos_load_get_sload(&load1, &load5, &load15); >> 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(LOAD_DISPLAY_BASELINE+0, LOAD_DISPLAY_STARTROW, >> 242 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 243 "Kernel (- Idle): %s %s %s ", >> 244 str1, str5, str15); >> 245 >> 246 sos_load_get_uload(&load1, &load5, &load15); >> 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(LOAD_DISPLAY_BASELINE+1, LOAD_DISPLAY_STARTROW, >> 251 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 252 "User: %s %s %s ", >> 253 str1, str5, str15); >> 254 >> 255 sos_load_get_uratio(&load1, &load5, &load15); >> 256 sos_load_to_string(str1, load1); >> 257 sos_load_to_string(str5, load5); >> 258 sos_load_to_string(str15, load15); >> 259 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+2, LOAD_DISPLAY_STARTROW, >> 260 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 261 "User CPU %%: %s %s %s ", >> 262 str1, str5, str15); >> 263 >> 264 /* The IDLE task is INcluded in the following computation */ >> 265 sos_load_get_sratio(&load1, &load5, &load15); >> 266 sos_load_to_string(str1, load1); >> 267 sos_load_to_string(str5, load5); >> 268 sos_load_to_string(str15, load15); >> 269 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+3, LOAD_DISPLAY_STARTROW, >> 270 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 271 "Kernel CPU %% (+ Idle): %s %s %s ", >> 272 str1, str5, str15); >> 273 sos_restore_IRQs(flags); >> 274 } >> 275 } >> 276 >> 277 >> 278 /* ====================================================================== >> 279 * Start the "init" (userland) process >> 280 */ >> 281 static sos_ret_t >> 282 start_init(struct sos_fs_manager_instance * rootfs) >> 283 { >> 284 sos_ret_t retval; >> 285 struct sos_umem_vmm_as *as_init; >> 286 struct sos_process *proc_init; >> 287 struct sos_thread *new_thr; >> 288 sos_uaddr_t ustack, start_uaddr; >> 289 struct sos_fs_opened_file * init_root, * init_cwd, * unused_of; >> 290 >> 291 /* Create the new process */ >> 292 proc_init = sos_process_create("init", FALSE); >> 293 if (! proc_init) >> 294 return -SOS_ENOMEM; >> 295 as_init = sos_process_get_address_space(proc_init); 137 296 138 /* Free the memory used by a big integer */ << 139 void bn_del(big_number_t * bn) << 140 { << 141 struct digit *d; << 142 297 143 list_collapse(*bn, d) !! 298 /* >> 299 * Setup the root and CWD directories of the process. The root of >> 300 * this process will correspond to the "global" root of the whole >> 301 * system since all the future processes will duplicate it ! >> 302 */ >> 303 retval = sos_fs_new_opened_file(proc_init, rootfs->root, >> 304 SOS_FS_OPEN_READ | SOS_FS_OPEN_WRITE, >> 305 & init_root); >> 306 if (SOS_OK != retval) 144 { 307 { 145 sos_kfree((sos_vaddr_t)d); !! 308 sos_process_unref(proc_init); >> 309 return -SOS_ENOENT; 146 } 310 } 147 } << 148 311 149 !! 312 /* Duplicate the root file to set the current working directory of 150 /* Shift left a big integer: bn := bn*10^shift !! 313 the init process */ 151 void bn_shift(big_number_t *bn, int shift) !! 314 retval = sos_fs_duplicate_opened_file(init_root, proc_init, 152 { !! 315 & init_cwd); 153 for ( ; shift > 0 ; shift --) !! 316 if (SOS_OK != retval) 154 { 317 { 155 bn_push_lsd(bn, 0); !! 318 sos_fs_close(init_root); >> 319 sos_process_unref(proc_init); >> 320 return -SOS_ENOENT; 156 } 321 } 157 } << 158 << 159 << 160 /* Dump the big integer in bochs */ << 161 void bn_print_bochs(const big_number_t bn) << 162 { << 163 int nb_elts; << 164 const struct digit *d; << 165 << 166 if (list_is_empty(bn)) << 167 sos_bochs_printf("0"); << 168 else << 169 list_foreach(bn, d, nb_elts) << 170 sos_bochs_printf("%d", d->value); << 171 } << 172 322 173 /* Dump the big integer on the console */ !! 323 /* Now update the process ! */ 174 void bn_print_console(unsigned char row, unsig !! 324 if ( ( SOS_OK != sos_process_chroot(proc_init, init_root, & unused_of) ) 175 unsigned char attribute, !! 325 || ( SOS_OK != sos_process_chdir(proc_init, init_cwd, & unused_of) ) ) 176 const big_number_t bn, << 177 int nb_decimals) << 178 { << 179 if (list_is_empty(bn)) << 180 sos_x86_videomem_printf(row, col, attribut << 181 else << 182 { 326 { 183 int nb_elts; !! 327 sos_fs_close(init_root); 184 const struct digit *d; !! 328 sos_fs_close(init_cwd); 185 unsigned char x = col; !! 329 sos_process_chroot(proc_init, NULL, & unused_of); 186 !! 330 sos_process_chdir(proc_init, NULL, & unused_of); 187 list_foreach(bn, d, nb_elts) !! 331 sos_process_unref(proc_init); 188 { !! 332 return -SOS_ENOENT; 189 if (nb_elts == 0) << 190 { << 191 sos_x86_videomem_printf(row, x, << 192 x += 2; << 193 } << 194 else if (nb_elts < nb_decimals) << 195 { << 196 sos_x86_videomem_printf(row, x, << 197 x ++; << 198 } << 199 } << 200 << 201 sos_x86_videomem_printf(row, x, attribut << 202 } 333 } 203 } << 204 334 205 335 206 /* Result is the addition of 2 big integers */ << 207 big_number_t bn_add (const big_number_t bn1, c << 208 { << 209 big_number_t retval; << 210 const struct digit *d1, *d2; << 211 sos_bool_t bn1_end = FALSE, bn2_end = FALSE << 212 char carry = 0; << 213 << 214 list_init(retval); << 215 d1 = list_get_tail(bn1); << 216 bn1_end = list_is_empty(bn1); << 217 d2 = list_get_tail(bn2); << 218 bn2_end = list_is_empty(bn2); << 219 do << 220 { << 221 if (! bn1_end) << 222 carry += d1->value; << 223 if (! bn2_end) << 224 carry += d2->value; << 225 << 226 bn_push_msd(&retval, carry % 10); << 227 carry /= 10; << 228 << 229 if (! bn1_end) << 230 d1 = d1->prev; << 231 if (! bn2_end) << 232 d2 = d2->prev; << 233 if (d1 == list_get_tail(bn1)) << 234 bn1_end = TRUE; << 235 if (d2 == list_get_tail(bn2)) << 236 bn2_end = TRUE; << 237 } << 238 while (!bn1_end || !bn2_end); << 239 336 240 if (carry > 0) !! 337 /* Map the 'init' program in user space */ >> 338 start_uaddr = sos_binfmt_elf32_map(as_init, "init"); >> 339 if (0 == start_uaddr) 241 { 340 { 242 bn_push_msd(&retval, carry); !! 341 sos_process_unref(proc_init); >> 342 return -SOS_ENOENT; 243 } 343 } 244 344 245 return retval; !! 345 /* Allocate the user stack */ 246 } !! 346 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; 247 !! 347 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, 248 !! 348 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, 249 /* Result is the multiplication of a big integ !! 349 /* PRIVATE */ 0); 250 big_number_t bn_muli (const big_number_t bn, c !! 350 if (SOS_OK != retval) 251 { << 252 big_number_t retval; << 253 int nb_elts; << 254 char carry = 0; << 255 const struct digit *d; << 256 << 257 list_init(retval); << 258 list_foreach_backward(bn, d, nb_elts) << 259 { 351 { 260 carry += d->value * digit; !! 352 sos_process_unref(proc_init); 261 bn_push_msd(&retval, carry % 10); !! 353 return -SOS_ENOMEM; 262 carry /= 10; << 263 } 354 } 264 355 265 if (carry > 0) !! 356 /* Now create the user thread */ >> 357 new_thr = sos_create_user_thread(NULL, >> 358 proc_init, >> 359 start_uaddr, >> 360 0, 0, >> 361 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, >> 362 SOS_SCHED_PRIO_TS_LOWEST); >> 363 if (! new_thr) 266 { 364 { 267 bn_push_msd(&retval, carry); !! 365 sos_process_unref(proc_init); 268 } !! 366 return -SOS_ENOMEM; 269 << 270 return retval; << 271 } << 272 << 273 << 274 /* Result is the multiplication of 2 big integ << 275 big_number_t bn_mult(const big_number_t bn1, c << 276 { << 277 int shift = 0; << 278 big_number_t retval; << 279 int nb_elts; << 280 struct digit *d; << 281 << 282 list_init(retval); << 283 list_foreach_backward(bn2, d, nb_elts) << 284 { << 285 big_number_t retmult = bn_muli(bn1, d->v << 286 big_number_t old_retval = retval; << 287 bn_shift(& retmult, shift); << 288 retval = bn_add(old_retval, retmult); << 289 bn_del(& retmult); << 290 bn_del(& old_retval); << 291 shift ++; << 292 } 367 } 293 368 294 return retval; !! 369 sos_process_unref(proc_init); >> 370 return SOS_OK; 295 } 371 } 296 372 297 373 298 /* Result is the factorial of an integer */ !! 374 /* ====================================================================== 299 big_number_t bn_fact(unsigned long int v) !! 375 * The C entry point of our operating system 300 { !! 376 */ 301 unsigned long int i; !! 377 void sos_main(unsigned long magic, unsigned long arg) 302 big_number_t retval = bn_new(1); << 303 for (i = 1 ; i <= v ; i++) << 304 { << 305 big_number_t I = bn_new(i); << 306 big_number_t tmp = bn_mult(retval, I); << 307 sos_x86_videomem_printf(4, 0, << 308 SOS_X86_VIDEO_BG << 309 "%d! = ", (int)i << 310 bn_print_console(4, 8, SOS_X86_VIDEO_BG_ << 311 tmp, 55); << 312 bn_del(& I); << 313 bn_del(& retval); << 314 retval = tmp; << 315 } << 316 << 317 return retval; << 318 } << 319 << 320 << 321 void bn_test() << 322 { << 323 big_number_t bn = bn_fact(1000); << 324 sos_bochs_printf("1000! = "); << 325 bn_print_bochs(bn); << 326 sos_bochs_printf("\n"); << 327 << 328 } << 329 << 330 << 331 /* The C entry point of our operating system * << 332 void sos_main(unsigned long magic, unsigned lo << 333 { 378 { 334 unsigned i; 379 unsigned i; 335 sos_paddr_t sos_kernel_core_base_paddr, sos_ 380 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; >> 381 struct sos_time tick_resolution; >> 382 struct sos_fs_manager_instance * rootfs; 336 383 337 /* Grub sends us a structure, called multibo !! 384 /* Size of RAM above 1MB. Might be undefined ! */ 338 precious informations about the system, s !! 385 unsigned long int upper_mem = 0; 339 documentation for more information. */ << 340 multiboot_info_t *mbi; << 341 mbi = (multiboot_info_t *) addr; << 342 386 343 /* Setup bochs and console, and clear the co 387 /* Setup bochs and console, and clear the console */ 344 sos_bochs_setup(); !! 388 sos_bochs_subsystem_setup(); 345 389 346 sos_x86_videomem_setup(); 390 sos_x86_videomem_setup(); 347 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 391 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 348 392 349 /* Greetings from SOS */ 393 /* Greetings from SOS */ 350 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 394 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 351 /* Loaded with Grub */ !! 395 { 352 sos_x86_videomem_printf(1, 0, !! 396 /* Grub sends us a structure, called multiboot_info_t with a lot of 353 SOS_X86_VIDEO_FG_Y !! 397 precious informations about the system, see the multiboot 354 "Welcome From GRUB !! 398 documentation for more information. */ 355 "SOS", ',', !! 399 multiboot_info_t *mbi = (multiboot_info_t *) arg; 356 (unsigned)(mbi->me !! 400 357 (unsigned)mbi->mem !! 401 /* Multiboot says: "The value returned for upper memory is >> 402 maximally the address of the first upper memory hole minus 1 >> 403 megabyte.". It also adds: "It is not guaranteed to be this >> 404 value." aka "YMMV" ;) */ >> 405 upper_mem = mbi->mem_upper; >> 406 sos_x86_videomem_printf(1, 0, >> 407 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 408 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 409 "SOS article 9", ',', >> 410 (unsigned)(upper_mem >> 10) + 1, >> 411 (unsigned)upper_mem); >> 412 } >> 413 else if (magic == 0x42244224) >> 414 { >> 415 /* Loaded with SOS bootsect */ >> 416 upper_mem = arg; >> 417 sos_x86_videomem_printf(1, 0, >> 418 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 419 "Welcome to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 420 "SOS article 9", ',', >> 421 (unsigned)(upper_mem >> 10) + 1, >> 422 (unsigned)upper_mem); >> 423 } 358 else 424 else 359 /* Not loaded with grub */ !! 425 /* Not loaded with grub, not from an enhanced bootsect */ 360 sos_x86_videomem_printf(1, 0, 426 sos_x86_videomem_printf(1, 0, 361 SOS_X86_VIDEO_FG_Y 427 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 362 "Welcome to SOS"); !! 428 "Welcome to SOS article 9"); 363 429 364 sos_bochs_putstring("Message in a bochs\n"); !! 430 sos_bochs_putstring("Message in a bochs: This is SOS article 9.\n"); 365 431 366 /* Setup CPU segmentation and IRQ subsystem 432 /* Setup CPU segmentation and IRQ subsystem */ 367 sos_gdt_setup(); !! 433 sos_gdt_subsystem_setup(); 368 sos_idt_setup(); !! 434 sos_idt_subsystem_setup(); 369 435 370 /* Setup SOS IRQs and exceptions subsystem * 436 /* Setup SOS IRQs and exceptions subsystem */ 371 sos_exceptions_setup(); !! 437 sos_exception_subsystem_setup(); 372 sos_irq_setup(); !! 438 sos_irq_subsystem_setup(); 373 439 374 /* Configure the timer so as to raise the IR 440 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 375 sos_i8254_set_frequency(100); 441 sos_i8254_set_frequency(100); 376 442 >> 443 /* Setup the kernel time subsystem to get prepared to take the timer >> 444 ticks into account */ >> 445 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; >> 446 sos_time_subsysem_setup(& tick_resolution); 377 447 378 /* We need a multiboot-compliant boot loader !! 448 /* We need to know the RAM size */ 379 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) !! 449 if (upper_mem == 0) 380 { 450 { 381 sos_x86_videomem_putstring(20, 0, 451 sos_x86_videomem_putstring(20, 0, 382 SOS_X86_VIDEO 452 SOS_X86_VIDEO_FG_LTRED 383 | SOS_X86_V 453 | SOS_X86_VIDEO_BG_BLUE 384 | SOS_X86_V 454 | SOS_X86_VIDEO_FG_BLINKING, 385 "I'm not load !! 455 "I don't know RAM size ! Load me with Grub..."); 386 /* STOP ! */ 456 /* STOP ! */ 387 for (;;) 457 for (;;) 388 continue; 458 continue; 389 } 459 } 390 460 >> 461 /* >> 462 * Some interrupt handlers >> 463 */ >> 464 391 /* Binding some HW interrupts and exceptions 465 /* Binding some HW interrupts and exceptions to software routines */ 392 sos_irq_set_routine(SOS_IRQ_TIMER, 466 sos_irq_set_routine(SOS_IRQ_TIMER, 393 clk_it); !! 467 clk_it); 394 /* Enabling the HW interrupts here, this wil !! 468 395 interrupt call our clk_it handler */ !! 469 /* 396 asm volatile ("sti\n"); !! 470 * Setup physical memory management 397 /* Multiboot says: "The value returned for u !! 471 */ 398 the address of the first upper memory hol !! 472 399 also adds: "It is not guaranteed to be th !! 473 SOS_ASSERT_FATAL(SOS_OK 400 sos_physmem_setup((mbi->mem_upper<<10) + (1< !! 474 == sos_physmem_subsystem_setup((upper_mem<<10) + (1<<20), 401 & sos_kernel_core_base_pad !! 475 &sos_kernel_core_base_paddr, 402 & sos_kernel_core_top_padd !! 476 &sos_kernel_core_top_paddr)); 403 477 404 /* 478 /* 405 * Switch to paged-memory mode 479 * Switch to paged-memory mode 406 */ 480 */ 407 481 408 /* Disabling interrupts should seem more cor 482 /* Disabling interrupts should seem more correct, but it's not really 409 necessary at this stage */ 483 necessary at this stage */ 410 if (sos_paging_setup(sos_kernel_core_base_pa !! 484 SOS_ASSERT_FATAL(SOS_OK == 411 sos_kernel_core_top_pad !! 485 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 412 sos_bochs_printf("Could not setup paged me !! 486 sos_kernel_core_top_paddr)); 413 sos_x86_videomem_printf(2, 0, !! 487 414 SOS_X86_VIDEO_FG_YEL !! 488 /* Bind the page fault exception */ 415 "Paged-memory mode i !! 489 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, >> 490 pgflt_ex); 416 491 >> 492 /* >> 493 * Setup kernel virtual memory allocator >> 494 */ 417 495 418 if (sos_kmem_vmm_setup(sos_kernel_core_base_ !! 496 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 419 sos_kernel_core_top_p !! 497 sos_kernel_core_top_paddr, >> 498 bootstrap_stack_bottom, >> 499 bootstrap_stack_bottom >> 500 + bootstrap_stack_size)) 420 sos_bochs_printf("Could not setup the Kern 501 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 421 502 422 if (sos_kmalloc_setup()) !! 503 if (sos_kmalloc_subsystem_setup()) 423 sos_bochs_printf("Could not setup the Kmal 504 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 424 505 425 /* Run some kmalloc tests */ !! 506 /* 426 bn_test(); !! 507 * Initialize the MMU context subsystem >> 508 */ >> 509 sos_mm_context_subsystem_setup(); 427 510 428 /* An operatig system never ends */ !! 511 /* 429 for (;;) !! 512 * Initialize the CPU context subsystem 430 continue; !! 513 */ >> 514 sos_cpu_context_subsystem_setup(); 431 515 432 return; !! 516 /* >> 517 * Bind the syscall handler to its software interrupt handler >> 518 */ >> 519 sos_swintr_subsystem_setup(); >> 520 >> 521 >> 522 /* >> 523 * Initialize the Kernel thread and scheduler subsystems >> 524 */ >> 525 >> 526 /* Initialize kernel thread subsystem */ >> 527 sos_thread_subsystem_setup(bootstrap_stack_bottom, >> 528 bootstrap_stack_size); >> 529 >> 530 /* Initialize the scheduler */ >> 531 sos_sched_subsystem_setup(); >> 532 >> 533 /* Declare the IDLE thread */ >> 534 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, >> 535 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 536 >> 537 /* Prepare the stats subsystem */ >> 538 sos_load_subsystem_setup(); >> 539 >> 540 /* Declare a thread that prints some stats */ >> 541 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, >> 542 NULL, >> 543 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 544 >> 545 >> 546 /* >> 547 * Initialise user address space management subsystem >> 548 */ >> 549 sos_umem_vmm_subsystem_setup(); >> 550 sos_dev_zero_subsystem_setup(); >> 551 sos_dev_mem_chardev_setup(); >> 552 >> 553 /* >> 554 * Initialize process stuff >> 555 */ >> 556 sos_process_subsystem_setup(); >> 557 >> 558 >> 559 /* Enabling the HW interrupts here, this will make the timer HW >> 560 interrupt call the scheduler */ >> 561 asm volatile ("sti\n"); >> 562 >> 563 >> 564 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_subsystem_setup()); >> 565 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_setup(NULL, >> 566 "virtfs", >> 567 NULL, >> 568 & rootfs)); >> 569 >> 570 >> 571 tty_subsystem_setup(); >> 572 sos_ttyS0_subsystem_setup(); >> 573 sos_console_subsystem_setup(); >> 574 >> 575 >> 576 >> 577 >> 578 /* Start the 'init' process, which in turns launches the other >> 579 programs */ >> 580 start_init(rootfs); >> 581 /* >> 582 * We can safely exit from this function now, for there is already >> 583 * an idle Kernel thread ready to make the CPU busy working... >> 584 * >> 585 * However, we must EXPLICITELY call sos_thread_exit() because a >> 586 * simple "return" will return nowhere ! Actually this first thread >> 587 * was initialized by the Grub bootstrap stage, at a time when the >> 588 * word "thread" did not exist. This means that the stack was not >> 589 * setup in order for a return here to call sos_thread_exit() >> 590 * automagically. Hence we must call it manually. This is the ONLY >> 591 * kernel thread where we must do this manually. >> 592 */ >> 593 sos_bochs_printf("Bye from primary thread !\n"); >> 594 sos_thread_exit(); >> 595 SOS_FATAL_ERROR("No trespassing !"); 433 } 596 }
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