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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> 022 #include <hwcore/idt.h> 023 #include <hwcore/gdt.h> 023 #include <hwcore/gdt.h> 024 #include <hwcore/irq.h> 024 #include <hwcore/irq.h> 025 #include <hwcore/exception.h> 025 #include <hwcore/exception.h> 026 #include <hwcore/i8254.h> 026 #include <hwcore/i8254.h> 027 #include <sos/list.h> 027 #include <sos/list.h> 028 #include <sos/physmem.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> 029 #include <sos/klibc.h> 033 #include <sos/assert.h> 030 #include <sos/assert.h> 034 #include <drivers/x86_videomem.h> 031 #include <drivers/x86_videomem.h> 035 #include <drivers/bochs.h> 032 #include <drivers/bochs.h> 036 033 037 034 038 /* Helper function to display each bits of a 3 035 /* Helper function to display each bits of a 32bits integer on the 039 screen as dark or light carrets */ 036 screen as dark or light carrets */ 040 static void display_bits(unsigned char row, un 037 static void display_bits(unsigned char row, unsigned char col, 041 unsigned char attribu 038 unsigned char attribute, 042 sos_ui32_t integer) 039 sos_ui32_t integer) 043 { 040 { 044 int i; 041 int i; 045 /* Scan each bit of the integer, MSb first * 042 /* Scan each bit of the integer, MSb first */ 046 for (i = 31 ; i >= 0 ; i--) 043 for (i = 31 ; i >= 0 ; i--) 047 { 044 { 048 /* Test if bit i of 'integer' is set */ 045 /* Test if bit i of 'integer' is set */ 049 int bit_i = (integer & (1 << i)); 046 int bit_i = (integer & (1 << i)); 050 /* Ascii 219 => dark carret, Ascii 177 = 047 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 051 unsigned char ascii_code = bit_i?219:177 048 unsigned char ascii_code = bit_i?219:177; 052 sos_x86_videomem_putchar(row, col++, 049 sos_x86_videomem_putchar(row, col++, 053 attribute, 050 attribute, 054 ascii_code); 051 ascii_code); 055 } 052 } 056 } 053 } 057 054 058 055 059 /* Clock IRQ handler */ 056 /* Clock IRQ handler */ 060 static void clk_it(int intid) 057 static void clk_it(int intid) 061 { 058 { 062 static sos_ui32_t clock_count = 0; 059 static sos_ui32_t clock_count = 0; 063 060 064 display_bits(0, 48, 061 display_bits(0, 48, 065 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 062 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 066 clock_count); 063 clock_count); 067 clock_count++; 064 clock_count++; 068 065 069 } 066 } 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; << 108 067 109 list_init(retval); !! 068 #define MY_PPAGE_NUM_INT 511 110 do !! 069 struct my_ppage 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 { 070 { 124 big_number_t retval; !! 071 sos_ui32_t before[MY_PPAGE_NUM_INT]; 125 int nb_elts; !! 072 struct my_ppage *prev, *next; 126 struct digit *d; !! 073 sos_ui32_t after[MY_PPAGE_NUM_INT]; 127 !! 074 }; /* sizeof() Must be <= 4kB */ 128 list_init(retval); !! 075 129 list_foreach(bn, d, nb_elts) !! 076 static void test_physmem() 130 { !! 077 { 131 bn_push_lsd(&retval, d->value); !! 078 /* We place the pages we did allocate here */ 132 } !! 079 struct my_ppage *ppage_list, *my_ppage; 133 !! 080 sos_count_t num_alloc_ppages = 0, num_free_ppages = 0; 134 return retval; !! 081 135 } !! 082 ppage_list = NULL; 136 !! 083 while ((my_ppage = (struct my_ppage*)sos_physmem_ref_physpage_new(FALSE)) 137 !! 084 != NULL) 138 /* Free the memory used by a big integer */ !! 085 { 139 void bn_del(big_number_t * bn) !! 086 int i; 140 { !! 087 num_alloc_ppages++; 141 struct digit *d; !! 088 142 !! 089 /* Print the allocation status */ 143 list_collapse(*bn, d) !! 090 sos_x86_videomem_printf(2, 0, 144 { !! 091 SOS_X86_VIDEO_FG_YELLOW 145 sos_kfree((sos_vaddr_t)d); !! 092 | SOS_X86_VIDEO_BG_BLUE, 146 } !! 093 "Could allocate %d pages ", 147 } !! 094 num_alloc_ppages); 148 !! 095 149 !! 096 /* We fill this page with its address */ 150 /* Shift left a big integer: bn := bn*10^shift !! 097 for (i = 0 ; i < MY_PPAGE_NUM_INT ; i++) 151 void bn_shift(big_number_t *bn, int shift) !! 098 my_ppage->before[i] = my_ppage->after[i] = (sos_ui32_t)my_ppage; 152 { !! 099 153 for ( ; shift > 0 ; shift --) !! 100 /* We add this page at the tail of our list of ppages */ 154 { !! 101 list_add_tail(ppage_list, my_ppage); 155 bn_push_lsd(bn, 0); !! 102 } 156 } !! 103 157 } !! 104 /* Now we release these pages in FIFO order */ 158 !! 105 while ((my_ppage = list_pop_head(ppage_list)) != NULL) 159 !! 106 { 160 /* Dump the big integer in bochs */ !! 107 /* We make sure this page was not overwritten by any unexpected 161 void bn_print_bochs(const big_number_t bn) !! 108 value */ 162 { !! 109 int i; 163 int nb_elts; !! 110 for (i = 0 ; i < MY_PPAGE_NUM_INT ; i++) 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 { 111 { 189 if (nb_elts == 0) !! 112 /* We don't get what we expect ! */ >> 113 if ((my_ppage->before[i] != (sos_ui32_t)my_ppage) >> 114 || (my_ppage->after[i] != (sos_ui32_t)my_ppage)) 190 { 115 { 191 sos_x86_videomem_printf(row, x, !! 116 /* STOP ! */ 192 x += 2; !! 117 sos_x86_videomem_putstring(20, 0, 193 } !! 118 SOS_X86_VIDEO_FG_LTRED 194 else if (nb_elts < nb_decimals) !! 119 | SOS_X86_VIDEO_BG_BLUE, 195 { !! 120 "Page overwritten"); 196 sos_x86_videomem_printf(row, x, !! 121 return; 197 x ++; << 198 } 122 } 199 } 123 } 200 124 201 sos_x86_videomem_printf(row, x, attribut !! 125 /* Release the descriptor */ 202 } !! 126 if (sos_physmem_unref_physpage((sos_paddr_t)my_ppage) < 0) 203 } !! 127 { 204 !! 128 /* STOP ! */ 205 !! 129 sos_x86_videomem_putstring(20, 0, 206 /* Result is the addition of 2 big integers */ !! 130 SOS_X86_VIDEO_FG_LTRED 207 big_number_t bn_add (const big_number_t bn1, c !! 131 | SOS_X86_VIDEO_BG_BLUE, 208 { !! 132 "Cannot release page"); 209 big_number_t retval; !! 133 return; 210 const struct digit *d1, *d2; !! 134 } 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; << 281 135 282 list_init(retval); !! 136 /* Print the deallocation status */ 283 list_foreach_backward(bn2, d, nb_elts) !! 137 num_free_ppages ++; 284 { !! 138 sos_x86_videomem_printf(2, 0, 285 big_number_t retmult = bn_muli(bn1, d->v !! 139 SOS_X86_VIDEO_FG_YELLOW 286 big_number_t old_retval = retval; !! 140 | SOS_X86_VIDEO_BG_BLUE, 287 bn_shift(& retmult, shift); !! 141 "Could free %d pages ", 288 retval = bn_add(old_retval, retmult); !! 142 num_free_ppages); 289 bn_del(& retmult); << 290 bn_del(& old_retval); << 291 shift ++; << 292 } 143 } 293 144 294 return retval; !! 145 /* Print the overall stats */ 295 } !! 146 sos_x86_videomem_printf(2, 0, 296 !! 147 SOS_X86_VIDEO_FG_LTGREEN 297 !! 148 | SOS_X86_VIDEO_BG_BLUE, 298 /* Result is the factorial of an integer */ !! 149 "Could allocate %d bytes, could free %d bytes ", 299 big_number_t bn_fact(unsigned long int v) !! 150 num_alloc_ppages << SOS_PAGE_SHIFT, 300 { !! 151 num_free_ppages << SOS_PAGE_SHIFT); 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 << 320 152 321 void bn_test() !! 153 SOS_ASSERT_FATAL(num_alloc_ppages == num_free_ppages); 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 } 154 } 329 155 330 156 331 /* The C entry point of our operating system * 157 /* The C entry point of our operating system */ 332 void sos_main(unsigned long magic, unsigned lo 158 void sos_main(unsigned long magic, unsigned long addr) 333 { 159 { 334 unsigned i; 160 unsigned i; 335 sos_paddr_t sos_kernel_core_base_paddr, sos_ 161 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 336 162 337 /* Grub sends us a structure, called multibo 163 /* Grub sends us a structure, called multiboot_info_t with a lot of 338 precious informations about the system, s 164 precious informations about the system, see the multiboot 339 documentation for more information. */ 165 documentation for more information. */ 340 multiboot_info_t *mbi; 166 multiboot_info_t *mbi; 341 mbi = (multiboot_info_t *) addr; 167 mbi = (multiboot_info_t *) addr; 342 168 343 /* Setup bochs and console, and clear the co 169 /* Setup bochs and console, and clear the console */ 344 sos_bochs_setup(); 170 sos_bochs_setup(); 345 171 346 sos_x86_videomem_setup(); 172 sos_x86_videomem_setup(); 347 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 173 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 348 174 349 /* Greetings from SOS */ 175 /* Greetings from SOS */ 350 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 176 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 351 /* Loaded with Grub */ 177 /* Loaded with Grub */ 352 sos_x86_videomem_printf(1, 0, 178 sos_x86_videomem_printf(1, 0, 353 SOS_X86_VIDEO_FG_Y 179 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 354 "Welcome From GRUB 180 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 355 "SOS", ',', 181 "SOS", ',', 356 (unsigned)(mbi->me 182 (unsigned)(mbi->mem_upper >> 10) + 1, 357 (unsigned)mbi->mem 183 (unsigned)mbi->mem_upper); 358 else 184 else 359 /* Not loaded with grub */ 185 /* Not loaded with grub */ 360 sos_x86_videomem_printf(1, 0, 186 sos_x86_videomem_printf(1, 0, 361 SOS_X86_VIDEO_FG_Y 187 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 362 "Welcome to SOS"); 188 "Welcome to SOS"); 363 189 364 sos_bochs_putstring("Message in a bochs\n"); 190 sos_bochs_putstring("Message in a bochs\n"); 365 191 366 /* Setup CPU segmentation and IRQ subsystem 192 /* Setup CPU segmentation and IRQ subsystem */ 367 sos_gdt_setup(); 193 sos_gdt_setup(); 368 sos_idt_setup(); 194 sos_idt_setup(); 369 195 370 /* Setup SOS IRQs and exceptions subsystem * 196 /* Setup SOS IRQs and exceptions subsystem */ 371 sos_exceptions_setup(); 197 sos_exceptions_setup(); 372 sos_irq_setup(); 198 sos_irq_setup(); 373 199 374 /* Configure the timer so as to raise the IR 200 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 375 sos_i8254_set_frequency(100); 201 sos_i8254_set_frequency(100); 376 202 377 203 378 /* We need a multiboot-compliant boot loader 204 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 379 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 205 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 380 { 206 { 381 sos_x86_videomem_putstring(20, 0, 207 sos_x86_videomem_putstring(20, 0, 382 SOS_X86_VIDEO 208 SOS_X86_VIDEO_FG_LTRED 383 | SOS_X86_V 209 | SOS_X86_VIDEO_BG_BLUE 384 | SOS_X86_V 210 | SOS_X86_VIDEO_FG_BLINKING, 385 "I'm not load 211 "I'm not loaded with Grub !"); 386 /* STOP ! */ 212 /* STOP ! */ 387 for (;;) 213 for (;;) 388 continue; 214 continue; 389 } 215 } 390 216 391 /* Binding some HW interrupts and exceptions 217 /* Binding some HW interrupts and exceptions to software routines */ 392 sos_irq_set_routine(SOS_IRQ_TIMER, 218 sos_irq_set_routine(SOS_IRQ_TIMER, 393 clk_it); 219 clk_it); 394 /* Enabling the HW interrupts here, this wil 220 /* Enabling the HW interrupts here, this will make the timer HW 395 interrupt call our clk_it handler */ 221 interrupt call our clk_it handler */ 396 asm volatile ("sti\n"); 222 asm volatile ("sti\n"); 397 /* Multiboot says: "The value returned for u 223 /* Multiboot says: "The value returned for upper memory is maximally 398 the address of the first upper memory hol 224 the address of the first upper memory hole minus 1 megabyte.". It 399 also adds: "It is not guaranteed to be th 225 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 400 sos_physmem_setup((mbi->mem_upper<<10) + (1< 226 sos_physmem_setup((mbi->mem_upper<<10) + (1<<20), 401 & sos_kernel_core_base_pad 227 & sos_kernel_core_base_paddr, 402 & sos_kernel_core_top_padd 228 & sos_kernel_core_top_paddr); 403 !! 229 test_physmem(); 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(); << 427 230 428 /* An operatig system never ends */ 231 /* An operatig system never ends */ 429 for (;;) 232 for (;;) 430 continue; 233 continue; 431 234 432 return; 235 return; 433 } 236 }
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