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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 002 Copyright (C) 1999 Free Software Foundation, Inc. 003 003 004 This program is free software; you can redi 004 This program is free software; you can redistribute it and/or 005 modify it under the terms of the GNU Genera 005 modify it under the terms of the GNU General Public License 006 as published by the Free Software Foundatio 006 as published by the Free Software Foundation; either version 2 007 of the License, or (at your option) any lat 007 of the License, or (at your option) any later version. 008 008 009 This program is distributed in the hope tha 009 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the 010 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU General Public License for more details 012 GNU General Public License for more details. 013 013 014 You should have received a copy of the GNU 014 You should have received a copy of the GNU General Public License 015 along with this program; if not, write to t 015 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place - Suite 3 016 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 017 USA. 017 USA. 018 */ 018 */ 019 019 020 /* Include definitions of the multiboot standa 020 /* Include definitions of the multiboot standard */ 021 #include <bootstrap/multiboot.h> 021 #include <bootstrap/multiboot.h> 022 #include <hwcore/idt.h> << 023 #include <hwcore/gdt.h> << 024 #include <hwcore/irq.h> << 025 #include <hwcore/exception.h> << 026 #include <hwcore/i8254.h> << 027 #include <sos/list.h> << 028 #include <sos/physmem.h> << 029 #include <hwcore/paging.h> << 030 #include <sos/kmem_vmm.h> << 031 #include <sos/kmalloc.h> << 032 #include <sos/klibc.h> 022 #include <sos/klibc.h> 033 #include <sos/assert.h> 023 #include <sos/assert.h> 034 #include <drivers/x86_videomem.h> 024 #include <drivers/x86_videomem.h> 035 #include <drivers/bochs.h> 025 #include <drivers/bochs.h> 036 026 037 027 038 /* Helper function to display each bits of a 3 << 039 screen as dark or light carrets */ << 040 static void display_bits(unsigned char row, un << 041 unsigned char attribu << 042 sos_ui32_t integer) << 043 { << 044 int i; << 045 /* Scan each bit of the integer, MSb first * << 046 for (i = 31 ; i >= 0 ; i--) << 047 { << 048 /* Test if bit i of 'integer' is set */ << 049 int bit_i = (integer & (1 << i)); << 050 /* Ascii 219 => dark carret, Ascii 177 = << 051 unsigned char ascii_code = bit_i?219:177 << 052 sos_x86_videomem_putchar(row, col++, << 053 attribute, << 054 ascii_code); << 055 } << 056 } << 057 << 058 << 059 /* Clock IRQ handler */ << 060 static void clk_it(int intid) << 061 { << 062 static sos_ui32_t clock_count = 0; << 063 << 064 display_bits(0, 48, << 065 SOS_X86_VIDEO_FG_LTGREEN | SOS_ << 066 clock_count); << 067 clock_count++; << 068 << 069 } << 070 struct digit << 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 << 082 /* Add a new digit after the LSD */ << 083 void bn_push_lsd(big_number_t * bn, char value << 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 } << 091 << 092 << 093 /* Add a new digit before the MSD */ << 094 void bn_push_msd(big_number_t * bn, char value << 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 << 103 << 104 /* Construct a big integer from a (machine) in << 105 big_number_t bn_new(unsigned long int i) << 106 { << 107 big_number_t retval; << 108 << 109 list_init(retval); << 110 do << 111 { << 112 bn_push_msd(&retval, i%10); << 113 i /= 10; << 114 } << 115 while (i != 0); << 116 << 117 return retval; << 118 } << 119 << 120 << 121 /* Create a new big integer from another big i << 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; << 127 << 128 list_init(retval); << 129 list_foreach(bn, d, nb_elts) << 130 { << 131 bn_push_lsd(&retval, d->value); << 132 } << 133 << 134 return retval; << 135 } << 136 << 137 << 138 /* Free the memory used by a big integer */ << 139 void bn_del(big_number_t * bn) << 140 { << 141 struct digit *d; << 142 << 143 list_collapse(*bn, d) << 144 { << 145 sos_kfree((sos_vaddr_t)d); << 146 } << 147 } << 148 << 149 << 150 /* Shift left a big integer: bn := bn*10^shift << 151 void bn_shift(big_number_t *bn, int shift) << 152 { << 153 for ( ; shift > 0 ; shift --) << 154 { << 155 bn_push_lsd(bn, 0); << 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 } << 172 << 173 /* Dump the big integer on the console */ << 174 void bn_print_console(unsigned char row, unsig << 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, attribut << 181 else << 182 { << 183 int nb_elts; << 184 const struct digit *d; << 185 unsigned char x = col; << 186 << 187 list_foreach(bn, d, nb_elts) << 188 { << 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 } << 203 } << 204 << 205 << 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 << 240 if (carry > 0) << 241 { << 242 bn_push_msd(&retval, carry); << 243 } << 244 << 245 return retval; << 246 } << 247 << 248 << 249 /* Result is the multiplication of a big integ << 250 big_number_t bn_muli (const big_number_t bn, c << 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 { << 260 carry += d->value * digit; << 261 bn_push_msd(&retval, carry % 10); << 262 carry /= 10; << 263 } << 264 << 265 if (carry > 0) << 266 { << 267 bn_push_msd(&retval, carry); << 268 } << 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 } << 293 << 294 return retval; << 295 } << 296 << 297 << 298 /* Result is the factorial of an integer */ << 299 big_number_t bn_fact(unsigned long int v) << 300 { << 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 << 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 << 330 028 331 /* The C entry point of our operating system * 029 /* The C entry point of our operating system */ 332 void sos_main(unsigned long magic, unsigned lo 030 void sos_main(unsigned long magic, unsigned long addr) 333 { 031 { 334 unsigned i; 032 unsigned i; 335 sos_paddr_t sos_kernel_core_base_paddr, sos_ << 336 033 337 /* Grub sends us a structure, called multibo 034 /* Grub sends us a structure, called multiboot_info_t with a lot of 338 precious informations about the system, s 035 precious informations about the system, see the multiboot 339 documentation for more information. */ 036 documentation for more information. */ 340 multiboot_info_t *mbi; 037 multiboot_info_t *mbi; 341 mbi = (multiboot_info_t *) addr; 038 mbi = (multiboot_info_t *) addr; 342 039 343 /* Setup bochs and console, and clear the co 040 /* Setup bochs and console, and clear the console */ 344 sos_bochs_setup(); 041 sos_bochs_setup(); 345 042 346 sos_x86_videomem_setup(); 043 sos_x86_videomem_setup(); 347 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 044 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 348 045 349 /* Greetings from SOS */ 046 /* Greetings from SOS */ 350 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 047 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 351 /* Loaded with Grub */ 048 /* Loaded with Grub */ 352 sos_x86_videomem_printf(1, 0, 049 sos_x86_videomem_printf(1, 0, 353 SOS_X86_VIDEO_FG_Y 050 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 354 "Welcome From GRUB 051 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 355 "SOS", ',', 052 "SOS", ',', 356 (unsigned)(mbi->me 053 (unsigned)(mbi->mem_upper >> 10) + 1, 357 (unsigned)mbi->mem 054 (unsigned)mbi->mem_upper); 358 else 055 else 359 /* Not loaded with grub */ 056 /* Not loaded with grub */ 360 sos_x86_videomem_printf(1, 0, 057 sos_x86_videomem_printf(1, 0, 361 SOS_X86_VIDEO_FG_Y 058 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 362 "Welcome to SOS"); 059 "Welcome to SOS"); 363 060 364 sos_bochs_putstring("Message in a bochs\n"); 061 sos_bochs_putstring("Message in a bochs\n"); 365 062 366 /* Setup CPU segmentation and IRQ subsystem << 367 sos_gdt_setup(); << 368 sos_idt_setup(); << 369 << 370 /* Setup SOS IRQs and exceptions subsystem * << 371 sos_exceptions_setup(); << 372 sos_irq_setup(); << 373 << 374 /* Configure the timer so as to raise the IR << 375 sos_i8254_set_frequency(100); << 376 << 377 << 378 /* We need a multiboot-compliant boot loader << 379 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) << 380 { << 381 sos_x86_videomem_putstring(20, 0, << 382 SOS_X86_VIDEO << 383 | SOS_X86_V << 384 | SOS_X86_V << 385 "I'm not load << 386 /* STOP ! */ << 387 for (;;) << 388 continue; << 389 } << 390 << 391 /* Binding some HW interrupts and exceptions << 392 sos_irq_set_routine(SOS_IRQ_TIMER, << 393 clk_it); << 394 /* Enabling the HW interrupts here, this wil << 395 interrupt call our clk_it handler */ << 396 asm volatile ("sti\n"); << 397 /* Multiboot says: "The value returned for u << 398 the address of the first upper memory hol << 399 also adds: "It is not guaranteed to be th << 400 sos_physmem_setup((mbi->mem_upper<<10) + (1< << 401 & sos_kernel_core_base_pad << 402 & sos_kernel_core_top_padd << 403 << 404 /* << 405 * Switch to paged-memory mode << 406 */ << 407 << 408 /* Disabling interrupts should seem more cor << 409 necessary at this stage */ << 410 if (sos_paging_setup(sos_kernel_core_base_pa << 411 sos_kernel_core_top_pad << 412 sos_bochs_printf("Could not setup paged me << 413 sos_x86_videomem_printf(2, 0, << 414 SOS_X86_VIDEO_FG_YEL << 415 "Paged-memory mode i << 416 << 417 << 418 if (sos_kmem_vmm_setup(sos_kernel_core_base_ << 419 sos_kernel_core_top_p << 420 sos_bochs_printf("Could not setup the Kern << 421 << 422 if (sos_kmalloc_setup()) << 423 sos_bochs_printf("Could not setup the Kmal << 424 << 425 /* Run some kmalloc tests */ << 426 bn_test(); << 427 063 428 /* An operatig system never ends */ 064 /* An operatig system never ends */ 429 for (;;) 065 for (;;) 430 continue; 066 continue; 431 067 432 return; 068 return; 433 } 069 }
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