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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> 029 #include <hwcore/paging.h> 030 #include <sos/list.h> !! 030 #include <sos/kmem_vmm.h> >> 031 #include <sos/kmalloc.h> 031 #include <sos/klibc.h> 032 #include <sos/klibc.h> 032 #include <sos/assert.h> 033 #include <sos/assert.h> 033 #include <drivers/x86_videomem.h> 034 #include <drivers/x86_videomem.h> 034 #include <drivers/bochs.h> 035 #include <drivers/bochs.h> 035 036 036 037 037 /* Helper function to display each bits of a 3 038 /* Helper function to display each bits of a 32bits integer on the 038 screen as dark or light carrets */ 039 screen as dark or light carrets */ 039 static void display_bits(unsigned char row, un 040 static void display_bits(unsigned char row, unsigned char col, 040 unsigned char attribu 041 unsigned char attribute, 041 sos_ui32_t integer) 042 sos_ui32_t integer) 042 { 043 { 043 int i; 044 int i; 044 /* Scan each bit of the integer, MSb first * 045 /* Scan each bit of the integer, MSb first */ 045 for (i = 31 ; i >= 0 ; i--) 046 for (i = 31 ; i >= 0 ; i--) 046 { 047 { 047 /* Test if bit i of 'integer' is set */ 048 /* Test if bit i of 'integer' is set */ 048 int bit_i = (integer & (1 << i)); 049 int bit_i = (integer & (1 << i)); 049 /* Ascii 219 => dark carret, Ascii 177 = 050 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 050 unsigned char ascii_code = bit_i?219:177 051 unsigned char ascii_code = bit_i?219:177; 051 sos_x86_videomem_putchar(row, col++, 052 sos_x86_videomem_putchar(row, col++, 052 attribute, 053 attribute, 053 ascii_code); 054 ascii_code); 054 } 055 } 055 } 056 } 056 057 057 058 058 /* Clock IRQ handler */ 059 /* Clock IRQ handler */ 059 static void clk_it(int intid) 060 static void clk_it(int intid) 060 { 061 { 061 static sos_ui32_t clock_count = 0; 062 static sos_ui32_t clock_count = 0; 062 063 063 display_bits(0, 48, 064 display_bits(0, 48, 064 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 065 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 065 clock_count); 066 clock_count); 066 clock_count++; 067 clock_count++; 067 068 068 } 069 } >> 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; >> 080 069 081 070 /* Page fault exception handler */ !! 082 /* Add a new digit after the LSD */ 071 static void pgflt_ex(int exid) !! 083 void bn_push_lsd(big_number_t * bn, char value) 072 { 084 { 073 sos_bochs_printf("Got page fault\n"); !! 085 struct digit *d; 074 sos_x86_videomem_printf(10, 30, !! 086 d = (struct digit*) sos_kmalloc(sizeof(struct digit), 0); 075 SOS_X86_VIDEO_FG_LTR !! 087 SOS_ASSERT_FATAL(d != NULL); 076 "Got EXPECTED (?) Pa !! 088 d->value = value; 077 for (;;) ; !! 089 list_add_tail(*bn, d); 078 } 090 } 079 091 080 static void test_paging(sos_vaddr_t sos_kernel !! 092 >> 093 /* Add a new digit before the MSD */ >> 094 void bn_push_msd(big_number_t * bn, char value) 081 { 095 { 082 /* The (linear) address of the page holding !! 096 struct digit *d; 083 currently executing */ !! 097 d = (struct digit*) sos_kmalloc(sizeof(struct digit), 0); 084 sos_vaddr_t vpage_code = SOS_PAGE_ALIGN_INF( !! 098 SOS_ASSERT_FATAL(d != NULL); >> 099 d->value = value; >> 100 list_add_head(*bn, d); >> 101 } 085 102 086 /* The new physical page that will hold the << 087 sos_paddr_t ppage_new; << 088 103 089 /* Where this page will be mapped temporaril !! 104 /* Construct a big integer from a (machine) integer */ 090 code into it: right after the kernel code !! 105 big_number_t bn_new(unsigned long int i) 091 sos_vaddr_t vpage_tmp = sos_kernel_core_top_ !! 106 { >> 107 big_number_t retval; 092 108 093 unsigned i; !! 109 list_init(retval); >> 110 do >> 111 { >> 112 bn_push_msd(&retval, i%10); >> 113 i /= 10; >> 114 } >> 115 while (i != 0); 094 116 095 /* Bind the page fault exception to one of o !! 117 return retval; 096 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA !! 118 } 097 pgflt_ex); << 098 119 099 /* << 100 * Test 1: move the page where we execute th << 101 * physical memory << 102 */ << 103 sos_x86_videomem_printf(4, 0, << 104 SOS_X86_VIDEO_FG_LTG << 105 "Moving current code << 106 120 >> 121 /* Create a new big integer from another big integer */ >> 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; 107 127 108 /* Allocate a new physical page */ !! 128 list_init(retval); 109 ppage_new = sos_physmem_ref_physpage_new(FAL !! 129 list_foreach(bn, d, nb_elts) 110 if (! ppage_new) << 111 { 130 { 112 /* STOP ! No memory left */ !! 131 bn_push_lsd(&retval, d->value); 113 sos_x86_videomem_putstring(20, 0, << 114 SOS_X86_VIDEO << 115 | SOS_X86_V << 116 "test_paging << 117 return; << 118 } 132 } 119 133 120 sos_x86_videomem_printf(5, 0, !! 134 return retval; 121 SOS_X86_VIDEO_FG_YEL !! 135 } 122 "Hello from the addr << 123 sos_paging_get_paddr << 124 136 125 sos_x86_videomem_printf(6, 0, << 126 SOS_X86_VIDEO_FG_YEL << 127 "Transfer vpage 0x%x << 128 vpage_code, << 129 sos_paging_get_paddr << 130 ppage_new, << 131 (unsigned)vpage_tmp) << 132 << 133 /* Map the page somewhere (right after the k << 134 to copy the code we are currently executi << 135 sos_paging_map(ppage_new, vpage_tmp, << 136 FALSE, << 137 SOS_VM_MAP_ATOMIC << 138 | SOS_VM_MAP_PROT_READ << 139 | SOS_VM_MAP_PROT_WRITE); << 140 << 141 /* Ok, the new page is referenced by the map << 142 reference to it */ << 143 sos_physmem_unref_physpage(ppage_new); << 144 << 145 /* Copy the contents of the current page of << 146 mapping */ << 147 memcpy((void*)vpage_tmp, << 148 (void*)vpage_code, << 149 SOS_PAGE_SIZE); << 150 << 151 /* Transfer the mapping of the current page << 152 sos_paging_map(ppage_new, vpage_code, << 153 FALSE, << 154 SOS_VM_MAP_ATOMIC << 155 | SOS_VM_MAP_PROT_READ << 156 | SOS_VM_MAP_PROT_WRITE); << 157 << 158 /* Ok, here we are: we have changed the phys << 159 code we are executing ;). However, this n << 160 virtual addresses: << 161 - vpage_tmp << 162 - vpage_code << 163 We can safely unmap it from sos_kernel_co << 164 still keeping the vpage_code mapping */ << 165 sos_paging_unmap(vpage_tmp); << 166 137 167 sos_x86_videomem_printf(7, 0, !! 138 /* Free the memory used by a big integer */ 168 SOS_X86_VIDEO_FG_YEL !! 139 void bn_del(big_number_t * bn) 169 "Hello from the addr !! 140 { 170 sos_paging_get_paddr !! 141 struct digit *d; 171 142 172 sos_x86_videomem_printf(9, 0, !! 143 list_collapse(*bn, d) 173 SOS_X86_VIDEO_FG_LTG !! 144 { 174 "Provoking a page fa !! 145 sos_kfree((sos_vaddr_t)d); >> 146 } >> 147 } 175 148 176 /* << 177 * Test 2: make sure the #PF handler works << 178 */ << 179 149 180 /* Scan part of the kernel up to a page faul !! 150 /* Shift left a big integer: bn := bn*10^shift */ 181 should occur on the first page unmapped a !! 151 void bn_shift(big_number_t *bn, int shift) 182 which is exactly the page we temporarily !! 152 { 183 (vpage_tmp) above to move the kernel code !! 153 for ( ; shift > 0 ; shift --) 184 for (i = vpage_code ; /* none */ ; i += SOS_ !! 154 { 185 { !! 155 bn_push_lsd(bn, 0); 186 unsigned *pint = (unsigned *)SOS_PAGE_AL !! 156 } 187 sos_bochs_printf("Test vaddr 0x%x : val= !! 157 } 188 sos_x86_videomem_printf(10, 0, !! 158 189 SOS_X86_VIDEO_FG !! 159 190 "Test vaddr 0x%x !! 160 /* Dump the big integer in bochs */ 191 (unsigned)pint); !! 161 void bn_print_bochs(const big_number_t bn) 192 sos_bochs_printf("0x%x\n", *pint); !! 162 { 193 sos_x86_videomem_printf(10, 30, !! 163 int nb_elts; 194 SOS_X86_VIDEO_FG !! 164 const struct digit *d; 195 "0x%x " !! 165 196 } !! 166 if (list_is_empty(bn)) 197 !! 167 sos_bochs_printf("0"); 198 /* BAD ! Did not get the page fault... */ !! 168 else 199 sos_x86_videomem_printf(20, 0, !! 169 list_foreach(bn, d, nb_elts) 200 SOS_X86_VIDEO_FG_LTR !! 170 sos_bochs_printf("%d", d->value); 201 "We should have had !! 171 } 202 vpage_tmp); !! 172 >> 173 /* Dump the big integer on the console */ >> 174 void bn_print_console(unsigned char row, unsigned char col, >> 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 >> 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, 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); >> 202 } >> 203 } >> 204 >> 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); >> 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 integer by a single digit */ >> 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) >> 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; 203 } 271 } 204 272 >> 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 ++; >> 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_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 >> 330 205 /* The C entry point of our operating system * 331 /* The C entry point of our operating system */ 206 void sos_main(unsigned long magic, unsigned lo 332 void sos_main(unsigned long magic, unsigned long addr) 207 { 333 { 208 unsigned i; 334 unsigned i; 209 sos_paddr_t sos_kernel_core_base_paddr, sos_ 335 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 210 336 211 /* Grub sends us a structure, called multibo 337 /* Grub sends us a structure, called multiboot_info_t with a lot of 212 precious informations about the system, s 338 precious informations about the system, see the multiboot 213 documentation for more information. */ 339 documentation for more information. */ 214 multiboot_info_t *mbi; 340 multiboot_info_t *mbi; 215 mbi = (multiboot_info_t *) addr; 341 mbi = (multiboot_info_t *) addr; 216 342 217 /* Setup bochs and console, and clear the co 343 /* Setup bochs and console, and clear the console */ 218 sos_bochs_setup(); 344 sos_bochs_setup(); 219 345 220 sos_x86_videomem_setup(); 346 sos_x86_videomem_setup(); 221 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 347 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 222 348 223 /* Greetings from SOS */ 349 /* Greetings from SOS */ 224 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 350 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 225 /* Loaded with Grub */ 351 /* Loaded with Grub */ 226 sos_x86_videomem_printf(1, 0, 352 sos_x86_videomem_printf(1, 0, 227 SOS_X86_VIDEO_FG_Y 353 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 228 "Welcome From GRUB 354 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 229 "SOS", ',', 355 "SOS", ',', 230 (unsigned)(mbi->me 356 (unsigned)(mbi->mem_upper >> 10) + 1, 231 (unsigned)mbi->mem 357 (unsigned)mbi->mem_upper); 232 else 358 else 233 /* Not loaded with grub */ 359 /* Not loaded with grub */ 234 sos_x86_videomem_printf(1, 0, 360 sos_x86_videomem_printf(1, 0, 235 SOS_X86_VIDEO_FG_Y 361 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 236 "Welcome to SOS"); 362 "Welcome to SOS"); 237 363 238 sos_bochs_putstring("Message in a bochs\n"); 364 sos_bochs_putstring("Message in a bochs\n"); 239 365 240 /* Setup CPU segmentation and IRQ subsystem 366 /* Setup CPU segmentation and IRQ subsystem */ 241 sos_gdt_setup(); 367 sos_gdt_setup(); 242 sos_idt_setup(); 368 sos_idt_setup(); 243 369 244 /* Setup SOS IRQs and exceptions subsystem * 370 /* Setup SOS IRQs and exceptions subsystem */ 245 sos_exceptions_setup(); 371 sos_exceptions_setup(); 246 sos_irq_setup(); 372 sos_irq_setup(); 247 373 248 /* Configure the timer so as to raise the IR 374 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 249 sos_i8254_set_frequency(100); 375 sos_i8254_set_frequency(100); 250 376 251 377 252 /* We need a multiboot-compliant boot loader 378 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 253 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 379 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 254 { 380 { 255 sos_x86_videomem_putstring(20, 0, 381 sos_x86_videomem_putstring(20, 0, 256 SOS_X86_VIDEO 382 SOS_X86_VIDEO_FG_LTRED 257 | SOS_X86_V 383 | SOS_X86_VIDEO_BG_BLUE 258 | SOS_X86_V 384 | SOS_X86_VIDEO_FG_BLINKING, 259 "I'm not load 385 "I'm not loaded with Grub !"); 260 /* STOP ! */ 386 /* STOP ! */ 261 for (;;) 387 for (;;) 262 continue; 388 continue; 263 } 389 } 264 390 265 /* Binding some HW interrupts and exceptions 391 /* Binding some HW interrupts and exceptions to software routines */ 266 sos_irq_set_routine(SOS_IRQ_TIMER, 392 sos_irq_set_routine(SOS_IRQ_TIMER, 267 clk_it); 393 clk_it); 268 /* Enabling the HW interrupts here, this wil 394 /* Enabling the HW interrupts here, this will make the timer HW 269 interrupt call our clk_it handler */ 395 interrupt call our clk_it handler */ 270 asm volatile ("sti\n"); 396 asm volatile ("sti\n"); 271 /* Multiboot says: "The value returned for u 397 /* Multiboot says: "The value returned for upper memory is maximally 272 the address of the first upper memory hol 398 the address of the first upper memory hole minus 1 megabyte.". It 273 also adds: "It is not guaranteed to be th 399 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 274 sos_physmem_setup((mbi->mem_upper<<10) + (1< 400 sos_physmem_setup((mbi->mem_upper<<10) + (1<<20), 275 & sos_kernel_core_base_pad 401 & sos_kernel_core_base_paddr, 276 & sos_kernel_core_top_padd 402 & sos_kernel_core_top_paddr); 277 403 278 /* 404 /* 279 * Switch to paged-memory mode 405 * Switch to paged-memory mode 280 */ 406 */ 281 407 282 /* Disabling interrupts should seem more cor 408 /* Disabling interrupts should seem more correct, but it's not really 283 necessary at this stage */ 409 necessary at this stage */ 284 if (sos_paging_setup(sos_kernel_core_base_pa 410 if (sos_paging_setup(sos_kernel_core_base_paddr, 285 sos_kernel_core_top_pad 411 sos_kernel_core_top_paddr)) 286 sos_bochs_printf("Could not setup paged me 412 sos_bochs_printf("Could not setup paged memory mode\n"); 287 sos_x86_videomem_printf(2, 0, 413 sos_x86_videomem_printf(2, 0, 288 SOS_X86_VIDEO_FG_YEL 414 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 289 "Paged-memory mode i 415 "Paged-memory mode is activated"); 290 416 291 test_paging(sos_kernel_core_top_paddr); !! 417 >> 418 if (sos_kmem_vmm_setup(sos_kernel_core_base_paddr, >> 419 sos_kernel_core_top_paddr)) >> 420 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); >> 421 >> 422 if (sos_kmalloc_setup()) >> 423 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); >> 424 >> 425 /* Run some kmalloc tests */ >> 426 bn_test(); 292 427 293 /* An operatig system never ends */ 428 /* An operatig system never ends */ 294 for (;;) 429 for (;;) 295 continue; 430 continue; 296 431 297 return; 432 return; 298 } 433 }
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