Navigation
- Accueil
- Présentation :
- FAQ
- Bugs et errata
- Contributions de lecteurs
- Téléchargements
- LXR (référencement des sources)
- Mailing-list
- Liens et Projets reliés
Site hébergé par :
Site hébergé par :
|
[ source navigation ] [ diff markup ] [ identifier search ] [ general search ] |
|||
|
||||
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 <sos/errno.h> << 020 << 021 /* Include definitions of the multiboot standa 020 /* Include definitions of the multiboot standard */ 022 #include <bootstrap/multiboot.h> 021 #include <bootstrap/multiboot.h> 023 #include <hwcore/idt.h> 022 #include <hwcore/idt.h> 024 #include <hwcore/gdt.h> 023 #include <hwcore/gdt.h> 025 #include <hwcore/irq.h> 024 #include <hwcore/irq.h> 026 #include <hwcore/exception.h> 025 #include <hwcore/exception.h> 027 #include <hwcore/i8254.h> 026 #include <hwcore/i8254.h> 028 #include <sos/list.h> 027 #include <sos/list.h> 029 #include <sos/physmem.h> 028 #include <sos/physmem.h> 030 #include <hwcore/paging.h> 029 #include <hwcore/paging.h> 031 #include <hwcore/mm_context.h> << 032 #include <hwcore/swintr.h> << 033 #include <sos/kmem_vmm.h> 030 #include <sos/kmem_vmm.h> 034 #include <sos/kmalloc.h> 031 #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> << 039 #include <sos/klibc.h> 032 #include <sos/klibc.h> 040 #include <sos/assert.h> 033 #include <sos/assert.h> 041 #include <drivers/x86_videomem.h> 034 #include <drivers/x86_videomem.h> 042 #include <drivers/bochs.h> 035 #include <drivers/bochs.h> 043 #include <sos/calcload.h> !! 036 044 #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> << 054 037 055 /* Helper function to display each bits of a 3 038 /* Helper function to display each bits of a 32bits integer on the 056 screen as dark or light carrets */ 039 screen as dark or light carrets */ 057 void display_bits(unsigned char row, unsigned !! 040 static void display_bits(unsigned char row, unsigned char col, 058 unsigned char attribute, !! 041 unsigned char attribute, 059 sos_ui32_t integer) !! 042 sos_ui32_t integer) 060 { 043 { 061 int i; 044 int i; 062 /* Scan each bit of the integer, MSb first * 045 /* Scan each bit of the integer, MSb first */ 063 for (i = 31 ; i >= 0 ; i--) 046 for (i = 31 ; i >= 0 ; i--) 064 { 047 { 065 /* Test if bit i of 'integer' is set */ 048 /* Test if bit i of 'integer' is set */ 066 int bit_i = (integer & (1 << i)); 049 int bit_i = (integer & (1 << i)); 067 /* Ascii 219 => dark carret, Ascii 177 = 050 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 068 unsigned char ascii_code = bit_i?219:177 051 unsigned char ascii_code = bit_i?219:177; 069 sos_x86_videomem_putchar(row, col++, 052 sos_x86_videomem_putchar(row, col++, 070 attribute, 053 attribute, 071 ascii_code); 054 ascii_code); 072 } 055 } 073 } 056 } 074 057 >> 058 075 /* Clock IRQ handler */ 059 /* Clock IRQ handler */ 076 static void clk_it(int intid) 060 static void clk_it(int intid) 077 { 061 { 078 static sos_ui32_t clock_count = 0; 062 static sos_ui32_t clock_count = 0; 079 063 080 display_bits(0, 48, 064 display_bits(0, 48, 081 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 065 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 082 clock_count); 066 clock_count); 083 clock_count++; 067 clock_count++; 084 068 085 /* Execute the expired timeout actions (if a !! 069 } 086 sos_time_do_tick(); !! 070 struct digit >> 071 { >> 072 struct digit *prev, *next; >> 073 char value; >> 074 }; >> 075 >> 076 /* Representation of a big (positive) integer: Most Significant Digit >> 077 (MSD) is the HEAD of the list. Least Significant Digit (LSD) is the >> 078 TAIL of the list */ >> 079 typedef struct digit * big_number_t; >> 080 087 081 088 /* Update scheduler statistics and status */ !! 082 /* Add a new digit after the LSD */ 089 sos_sched_do_timer_tick(); !! 083 void bn_push_lsd(big_number_t * bn, char value) >> 084 { >> 085 struct digit *d; >> 086 d = (struct digit*) sos_kmalloc(sizeof(struct digit), 0); >> 087 SOS_ASSERT_FATAL(d != NULL); >> 088 d->value = value; >> 089 list_add_tail(*bn, d); 090 } 090 } 091 091 092 092 093 /* =========================================== !! 093 /* Add a new digit before the MSD */ 094 * Page fault exception handling !! 094 void bn_push_msd(big_number_t * bn, char value) 095 */ !! 095 { >> 096 struct digit *d; >> 097 d = (struct digit*) sos_kmalloc(sizeof(struct digit), 0); >> 098 SOS_ASSERT_FATAL(d != NULL); >> 099 d->value = value; >> 100 list_add_head(*bn, d); >> 101 } 096 102 097 103 098 /* Page fault exception handler with demand pa !! 104 /* Construct a big integer from a (machine) integer */ 099 static void pgflt_ex(int intid, struct sos_cpu !! 105 big_number_t bn_new(unsigned long int i) 100 { 106 { 101 static sos_ui32_t demand_paging_count = 0; !! 107 big_number_t retval; 102 struct sos_thread * cur_thr = sos_thread_get << 103 sos_vaddr_t faulting_vaddr = sos_cpu_contex << 104 sos_paddr_t ppage_paddr; << 105 108 106 if (sos_cpu_context_is_in_user_mode(ctxt) !! 109 list_init(retval); 107 || (cur_thr->fixup_uaccess.return_vaddr) !! 110 do 108 { 111 { 109 __label__ unforce_address_space; !! 112 bn_push_msd(&retval, i%10); 110 sos_bool_t need_to_setup_mmu; !! 113 i /= 10; 111 sos_ui32_t errcode = sos_cpu_context_get !! 114 } 112 !! 115 while (i != 0); 113 /* Make sure to always stay in the inter << 114 configuration */ << 115 need_to_setup_mmu = (cur_thr->squatted_m << 116 != sos_process_get_ << 117 if (need_to_setup_mmu) << 118 sos_thread_prepare_user_space_access(N << 119 116 120 if (SOS_OK == !! 117 return retval; 121 sos_umem_vmm_try_resolve_page_fault( !! 118 } 122 << 123 << 124 goto unforce_address_space; << 125 119 126 /* If the page fault occured in kernel m << 127 the fixup address */ << 128 if (! sos_cpu_context_is_in_user_mode(ct << 129 { << 130 cur_thr->fixup_uaccess.faulted_uaddr << 131 sos_cpu_context_set_EX_return_addres << 132 << 133 goto unforce_address_space; << 134 } << 135 120 136 if (need_to_setup_mmu) !! 121 /* Create a new big integer from another big integer */ 137 sos_thread_end_user_space_access(); !! 122 big_number_t bn_copy(const big_number_t bn) >> 123 { >> 124 big_number_t retval; >> 125 int nb_elts; >> 126 struct digit *d; 138 127 139 sos_bochs_printf("Unresolved USER page F !! 128 list_init(retval); 140 sos_cpu_context_get_PC( !! 129 list_foreach(bn, d, nb_elts) 141 (unsigned)faulting_vadd !! 130 { 142 (unsigned)sos_cpu_conte !! 131 bn_push_lsd(&retval, d->value); 143 sos_bochs_printf("Terminating User threa << 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 ra << 153 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v << 154 { << 155 /* No: The page fault is out of any kern << 156 the moment, we don't handle this. */ << 157 sos_display_fatal_error("Unresolved page << 158 sos_cpu_context_ << 159 (unsigned)faulti << 160 (unsigned)sos_cp << 161 SOS_ASSERT_FATAL(! "Got page fault (note << 162 } 132 } 163 133 >> 134 return retval; >> 135 } 164 136 165 /* << 166 * Demand paging in kernel space << 167 */ << 168 << 169 /* Update the number of demand paging reques << 170 demand_paging_count ++; << 171 display_bits(0, 0, << 172 SOS_X86_VIDEO_FG_LTRED | SOS_X8 << 173 demand_paging_count); << 174 << 175 /* Allocate a new page for the virtual addre << 176 ppage_paddr = sos_physmem_ref_physpage_new(F << 177 if (! ppage_paddr) << 178 SOS_ASSERT_FATAL(! "TODO: implement swap. << 179 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp << 180 SO << 181 FA << 182 SO << 183 | << 184 | << 185 sos_physmem_unref_physpage(ppage_paddr); << 186 << 187 /* Ok, we can now return to interrupted cont << 188 } << 189 << 190 << 191 << 192 /* =========================================== << 193 * An operating system MUST always have a read << 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 << 203 exception (old 80386 CPU) */ << 204 asm("hlt\n"); << 205 << 206 idle_twiddle ++; << 207 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE << 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 statis << 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 foll << 237 sos_load_get_sload(&load1, &load5, &load << 238 sos_load_to_string(str1, load1); << 239 sos_load_to_string(str5, load5); << 240 sos_load_to_string(str15, load15); << 241 sos_x86_videomem_printf(LOAD_DISPLAY_BAS << 242 SOS_X86_VIDEO_FG << 243 "Kernel (- Idle) << 244 str1, str5, str1 << 245 << 246 sos_load_get_uload(&load1, &load5, &load << 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_BAS << 251 SOS_X86_VIDEO_FG << 252 "User: %s %s %s << 253 str1, str5, str1 << 254 << 255 sos_load_get_uratio(&load1, &load5, &loa << 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_BAS << 260 SOS_X86_VIDEO_FG << 261 "User CPU %%: %s << 262 str1, str5, str1 << 263 << 264 /* The IDLE task is INcluded in the foll << 265 sos_load_get_sratio(&load1, &load5, &loa << 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_BAS << 270 SOS_X86_VIDEO_FG << 271 "Kernel CPU %% ( << 272 str1, str5, str1 << 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 * ro << 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, * ini << 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 << 296 137 >> 138 /* Free the memory used by a big integer */ >> 139 void bn_del(big_number_t * bn) >> 140 { >> 141 struct digit *d; 297 142 298 /* !! 143 list_collapse(*bn, d) 299 * Setup the root and CWD directories of the << 300 * this process will correspond to the "glob << 301 * system since all the future processes wil << 302 */ << 303 retval = sos_fs_new_opened_file(proc_init, r << 304 SOS_FS_OPEN_ << 305 & init_root) << 306 if (SOS_OK != retval) << 307 { 144 { 308 sos_process_unref(proc_init); !! 145 sos_kfree((sos_vaddr_t)d); 309 return -SOS_ENOENT; << 310 } 146 } >> 147 } 311 148 312 /* Duplicate the root file to set the curren !! 149 313 the init process */ !! 150 /* Shift left a big integer: bn := bn*10^shift */ 314 retval = sos_fs_duplicate_opened_file(init_r !! 151 void bn_shift(big_number_t *bn, int shift) 315 & init !! 152 { 316 if (SOS_OK != retval) !! 153 for ( ; shift > 0 ; shift --) 317 { 154 { 318 sos_fs_close(init_root); !! 155 bn_push_lsd(bn, 0); 319 sos_process_unref(proc_init); << 320 return -SOS_ENOENT; << 321 } 156 } >> 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 } 322 172 323 /* Now update the process ! */ !! 173 /* Dump the big integer on the console */ 324 if ( ( SOS_OK != sos_process_chroot(proc_ini !! 174 void bn_print_console(unsigned char row, unsigned char col, 325 || ( SOS_OK != sos_process_chdir(proc_i !! 175 unsigned char attribute, >> 176 const big_number_t bn, >> 177 int nb_decimals) >> 178 { >> 179 if (list_is_empty(bn)) >> 180 sos_x86_videomem_printf(row, col, attribute, "0"); >> 181 else 326 { 182 { 327 sos_fs_close(init_root); !! 183 int nb_elts; 328 sos_fs_close(init_cwd); !! 184 const struct digit *d; 329 sos_process_chroot(proc_init, NULL, & un !! 185 unsigned char x = col; 330 sos_process_chdir(proc_init, NULL, & unu !! 186 331 sos_process_unref(proc_init); !! 187 list_foreach(bn, d, nb_elts) 332 return -SOS_ENOENT; !! 188 { >> 189 if (nb_elts == 0) >> 190 { >> 191 sos_x86_videomem_printf(row, x, attribute, "%d.", d->value); >> 192 x += 2; >> 193 } >> 194 else if (nb_elts < nb_decimals) >> 195 { >> 196 sos_x86_videomem_printf(row, x, attribute, "%d", d->value); >> 197 x ++; >> 198 } >> 199 } >> 200 >> 201 sos_x86_videomem_printf(row, x, attribute, " . 10^{%d} ", nb_elts-1); 333 } 202 } >> 203 } 334 204 335 205 >> 206 /* Result is the addition of 2 big integers */ >> 207 big_number_t bn_add (const big_number_t bn1, const big_number_t bn2) >> 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); 336 239 337 /* Map the 'init' program in user space */ !! 240 if (carry > 0) 338 start_uaddr = sos_binfmt_elf32_map(as_init, << 339 if (0 == start_uaddr) << 340 { 241 { 341 sos_process_unref(proc_init); !! 242 bn_push_msd(&retval, carry); 342 return -SOS_ENOENT; << 343 } 243 } 344 244 345 /* Allocate the user stack */ !! 245 return retval; 346 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ !! 246 } 347 retval = sos_dev_zero_map(as_init, &ustack, !! 247 348 SOS_VM_MAP_PROT_RE !! 248 349 /* PRIVATE */ 0); !! 249 /* Result is the multiplication of a big integer by a single digit */ 350 if (SOS_OK != retval) !! 250 big_number_t bn_muli (const big_number_t bn, char digit) >> 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) 351 { 259 { 352 sos_process_unref(proc_init); !! 260 carry += d->value * digit; 353 return -SOS_ENOMEM; !! 261 bn_push_msd(&retval, carry % 10); >> 262 carry /= 10; 354 } 263 } 355 264 356 /* Now create the user thread */ !! 265 if (carry > 0) 357 new_thr = sos_create_user_thread(NULL, << 358 proc_init, << 359 start_uaddr << 360 0, 0, << 361 ustack + SO << 362 SOS_SCHED_P << 363 if (! new_thr) << 364 { 266 { 365 sos_process_unref(proc_init); !! 267 bn_push_msd(&retval, carry); 366 return -SOS_ENOMEM; !! 268 } >> 269 >> 270 return retval; >> 271 } >> 272 >> 273 >> 274 /* Result is the multiplication of 2 big integers */ >> 275 big_number_t bn_mult(const big_number_t bn1, const big_number_t bn2) >> 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->value); >> 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 ++; 367 } 292 } 368 293 369 sos_process_unref(proc_init); !! 294 return retval; 370 return SOS_OK; << 371 } 295 } 372 296 373 297 374 /* =========================================== !! 298 /* Result is the factorial of an integer */ 375 * The C entry point of our operating system !! 299 big_number_t bn_fact(unsigned long int v) 376 */ !! 300 { 377 void sos_main(unsigned long magic, unsigned lo !! 301 unsigned long int i; >> 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_BLUE | SOS_X86_VIDEO_FG_LTGREEN, >> 309 "%d! = ", (int)i); >> 310 bn_print_console(4, 8, SOS_X86_VIDEO_BG_BLUE | SOS_X86_VIDEO_FG_WHITE, >> 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 long addr) 378 { 333 { 379 unsigned i; 334 unsigned i; 380 sos_paddr_t sos_kernel_core_base_paddr, sos_ 335 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; << 383 336 384 /* Size of RAM above 1MB. Might be undefined !! 337 /* Grub sends us a structure, called multiboot_info_t with a lot of 385 unsigned long int upper_mem = 0; !! 338 precious informations about the system, see the multiboot >> 339 documentation for more information. */ >> 340 multiboot_info_t *mbi; >> 341 mbi = (multiboot_info_t *) addr; 386 342 387 /* Setup bochs and console, and clear the co 343 /* Setup bochs and console, and clear the console */ 388 sos_bochs_subsystem_setup(); !! 344 sos_bochs_setup(); 389 345 390 sos_x86_videomem_setup(); 346 sos_x86_videomem_setup(); 391 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 347 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 392 348 393 /* Greetings from SOS */ 349 /* Greetings from SOS */ 394 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 350 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 395 { !! 351 /* Loaded with Grub */ 396 /* Grub sends us a structure, called mul !! 352 sos_x86_videomem_printf(1, 0, 397 precious informations about the syste !! 353 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 398 documentation for more information. * !! 354 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 399 multiboot_info_t *mbi = (multiboot_info_ !! 355 "SOS", ',', 400 !! 356 (unsigned)(mbi->mem_upper >> 10) + 1, 401 /* Multiboot says: "The value returned f !! 357 (unsigned)mbi->mem_upper); 402 maximally the address of the first up << 403 megabyte.". It also adds: "It is not << 404 value." aka "YMMV" ;) */ << 405 upper_mem = mbi->mem_upper; << 406 sos_x86_videomem_printf(1, 0, << 407 SOS_X86_VIDEO_FG << 408 "Welcome From GR << 409 "SOS article 9", << 410 (unsigned)(upper << 411 (unsigned)upper_ << 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 << 419 "Welcome to %s%c << 420 "SOS article 9", << 421 (unsigned)(upper << 422 (unsigned)upper_ << 423 } << 424 else 358 else 425 /* Not loaded with grub, not from an enhan !! 359 /* Not loaded with grub */ 426 sos_x86_videomem_printf(1, 0, 360 sos_x86_videomem_printf(1, 0, 427 SOS_X86_VIDEO_FG_Y 361 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 428 "Welcome to SOS ar !! 362 "Welcome to SOS"); 429 363 430 sos_bochs_putstring("Message in a bochs: Thi !! 364 sos_bochs_putstring("Message in a bochs\n"); 431 365 432 /* Setup CPU segmentation and IRQ subsystem 366 /* Setup CPU segmentation and IRQ subsystem */ 433 sos_gdt_subsystem_setup(); !! 367 sos_gdt_setup(); 434 sos_idt_subsystem_setup(); !! 368 sos_idt_setup(); 435 369 436 /* Setup SOS IRQs and exceptions subsystem * 370 /* Setup SOS IRQs and exceptions subsystem */ 437 sos_exception_subsystem_setup(); !! 371 sos_exceptions_setup(); 438 sos_irq_subsystem_setup(); !! 372 sos_irq_setup(); 439 373 440 /* Configure the timer so as to raise the IR 374 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 441 sos_i8254_set_frequency(100); 375 sos_i8254_set_frequency(100); 442 376 443 /* Setup the kernel time subsystem to get pr << 444 ticks into account */ << 445 tick_resolution = (struct sos_time) { .sec=0 << 446 sos_time_subsysem_setup(& tick_resolution); << 447 377 448 /* We need to know the RAM size */ !! 378 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 449 if (upper_mem == 0) !! 379 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 450 { 380 { 451 sos_x86_videomem_putstring(20, 0, 381 sos_x86_videomem_putstring(20, 0, 452 SOS_X86_VIDEO 382 SOS_X86_VIDEO_FG_LTRED 453 | SOS_X86_V 383 | SOS_X86_VIDEO_BG_BLUE 454 | SOS_X86_V 384 | SOS_X86_VIDEO_FG_BLINKING, 455 "I don't know !! 385 "I'm not loaded with Grub !"); 456 /* STOP ! */ 386 /* STOP ! */ 457 for (;;) 387 for (;;) 458 continue; 388 continue; 459 } 389 } 460 390 461 /* << 462 * Some interrupt handlers << 463 */ << 464 << 465 /* Binding some HW interrupts and exceptions 391 /* Binding some HW interrupts and exceptions to software routines */ 466 sos_irq_set_routine(SOS_IRQ_TIMER, 392 sos_irq_set_routine(SOS_IRQ_TIMER, 467 clk_it); !! 393 clk_it); 468 !! 394 /* Enabling the HW interrupts here, this will make the timer HW 469 /* !! 395 interrupt call our clk_it handler */ 470 * Setup physical memory management !! 396 asm volatile ("sti\n"); 471 */ !! 397 /* Multiboot says: "The value returned for upper memory is maximally 472 !! 398 the address of the first upper memory hole minus 1 megabyte.". It 473 SOS_ASSERT_FATAL(SOS_OK !! 399 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 474 == sos_physmem_subsystem_se !! 400 sos_physmem_setup((mbi->mem_upper<<10) + (1<<20), 475 !! 401 & sos_kernel_core_base_paddr, 476 !! 402 & sos_kernel_core_top_paddr); 477 403 478 /* 404 /* 479 * Switch to paged-memory mode 405 * Switch to paged-memory mode 480 */ 406 */ 481 407 482 /* Disabling interrupts should seem more cor 408 /* Disabling interrupts should seem more correct, but it's not really 483 necessary at this stage */ 409 necessary at this stage */ 484 SOS_ASSERT_FATAL(SOS_OK == !! 410 if (sos_paging_setup(sos_kernel_core_base_paddr, 485 sos_paging_subsystem_setup( !! 411 sos_kernel_core_top_paddr)) 486 !! 412 sos_bochs_printf("Could not setup paged memory mode\n"); 487 !! 413 sos_x86_videomem_printf(2, 0, 488 /* Bind the page fault exception */ !! 414 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 489 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA !! 415 "Paged-memory mode is activated"); 490 pgflt_ex); << 491 416 492 /* << 493 * Setup kernel virtual memory allocator << 494 */ << 495 417 496 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ !! 418 if (sos_kmem_vmm_setup(sos_kernel_core_base_paddr, 497 sos_kernel_ !! 419 sos_kernel_core_top_paddr)) 498 bootstrap_s << 499 bootstrap_s << 500 + bootstrap << 501 sos_bochs_printf("Could not setup the Kern 420 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 502 421 503 if (sos_kmalloc_subsystem_setup()) !! 422 if (sos_kmalloc_setup()) 504 sos_bochs_printf("Could not setup the Kmal 423 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 505 424 506 /* !! 425 /* Run some kmalloc tests */ 507 * Initialize the MMU context subsystem !! 426 bn_test(); 508 */ << 509 sos_mm_context_subsystem_setup(); << 510 427 511 /* !! 428 /* An operatig system never ends */ 512 * Initialize the CPU context subsystem !! 429 for (;;) 513 */ !! 430 continue; 514 sos_cpu_context_subsystem_setup(); << 515 431 516 /* !! 432 return; 517 * Bind the syscall handler to its software << 518 */ << 519 sos_swintr_subsystem_setup(); << 520 << 521 << 522 /* << 523 * Initialize the Kernel thread and schedule << 524 */ << 525 << 526 /* Initialize kernel thread subsystem */ << 527 sos_thread_subsystem_setup(bootstrap_stack_b << 528 bootstrap_stack_s << 529 << 530 /* Initialize the scheduler */ << 531 sos_sched_subsystem_setup(); << 532 << 533 /* Declare the IDLE thread */ << 534 SOS_ASSERT_FATAL(sos_create_kernel_thread("i << 535 SO << 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("s << 542 NU << 543 SO << 544 << 545 << 546 /* << 547 * Initialise user address space management << 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 wil << 560 interrupt call the scheduler */ << 561 asm volatile ("sti\n"); << 562 << 563 << 564 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_sub << 565 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_ << 566 << 567 << 568 << 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 << 579 programs */ << 580 start_init(rootfs); << 581 /* << 582 * We can safely exit from this function now << 583 * an idle Kernel thread ready to make the C << 584 * << 585 * However, we must EXPLICITELY call sos_thr << 586 * simple "return" will return nowhere ! Act << 587 * was initialized by the Grub bootstrap sta << 588 * word "thread" did not exist. This means t << 589 * setup in order for a return here to call << 590 * automagically. Hence we must call it manu << 591 * kernel thread where we must do this manua << 592 */ << 593 sos_bochs_printf("Bye from primary thread !\ << 594 sos_thread_exit(); << 595 SOS_FATAL_ERROR("No trespassing !"); << 596 } 433 }
| [ source navigation ] | [ diff markup ] | [ identifier search ] | [ general search ] |