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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 definitions of the multiboot standa 020 /* Include definitions of the multiboot standard */ 020 #include <bootstrap/multiboot.h> 021 #include <bootstrap/multiboot.h> 021 #include <hwcore/idt.h> 022 #include <hwcore/idt.h> 022 #include <hwcore/gdt.h> 023 #include <hwcore/gdt.h> 023 #include <hwcore/irq.h> 024 #include <hwcore/irq.h> 024 #include <hwcore/exception.h> 025 #include <hwcore/exception.h> 025 #include <hwcore/i8254.h> 026 #include <hwcore/i8254.h> 026 #include <sos/list.h> 027 #include <sos/list.h> 027 #include <sos/physmem.h> 028 #include <sos/physmem.h> 028 #include <hwcore/paging.h> 029 #include <hwcore/paging.h> 029 #include <hwcore/mm_context.h> << 030 #include <hwcore/swintr.h> << 031 #include <sos/kmem_vmm.h> 030 #include <sos/kmem_vmm.h> 032 #include <sos/kmalloc.h> 031 #include <sos/kmalloc.h> 033 #include <sos/time.h> << 034 #include <sos/thread.h> << 035 #include <sos/process.h> << 036 #include <sos/klibc.h> 032 #include <sos/klibc.h> 037 #include <sos/assert.h> 033 #include <sos/assert.h> 038 #include <drivers/x86_videomem.h> 034 #include <drivers/x86_videomem.h> 039 #include <drivers/bochs.h> 035 #include <drivers/bochs.h> 040 #include <sos/calcload.h> << 041 036 042 037 043 /* Helper function to display each bits of a 3 038 /* Helper function to display each bits of a 32bits integer on the 044 screen as dark or light carrets */ 039 screen as dark or light carrets */ 045 void display_bits(unsigned char row, unsigned !! 040 static void display_bits(unsigned char row, unsigned char col, 046 unsigned char attribute, !! 041 unsigned char attribute, 047 sos_ui32_t integer) !! 042 sos_ui32_t integer) 048 { 043 { 049 int i; 044 int i; 050 /* Scan each bit of the integer, MSb first * 045 /* Scan each bit of the integer, MSb first */ 051 for (i = 31 ; i >= 0 ; i--) 046 for (i = 31 ; i >= 0 ; i--) 052 { 047 { 053 /* Test if bit i of 'integer' is set */ 048 /* Test if bit i of 'integer' is set */ 054 int bit_i = (integer & (1 << i)); 049 int bit_i = (integer & (1 << i)); 055 /* Ascii 219 => dark carret, Ascii 177 = 050 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 056 unsigned char ascii_code = bit_i?219:177 051 unsigned char ascii_code = bit_i?219:177; 057 sos_x86_videomem_putchar(row, col++, 052 sos_x86_videomem_putchar(row, col++, 058 attribute, 053 attribute, 059 ascii_code); 054 ascii_code); 060 } 055 } 061 } 056 } 062 057 063 058 064 /* Clock IRQ handler */ 059 /* Clock IRQ handler */ 065 static void clk_it(int intid) 060 static void clk_it(int intid) 066 { 061 { 067 static sos_ui32_t clock_count = 0; 062 static sos_ui32_t clock_count = 0; 068 063 069 display_bits(0, 48, 064 display_bits(0, 48, 070 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 065 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 071 clock_count); 066 clock_count); 072 clock_count++; 067 clock_count++; 073 068 074 /* Execute the expired timeout actions (if a !! 069 } 075 sos_time_do_tick(); !! 070 struct digit >> 071 { >> 072 struct digit *prev, *next; >> 073 char value; >> 074 }; 076 075 077 /* Update scheduler statistics and status */ !! 076 /* Representation of a big (positive) integer: Most Significant Digit 078 sos_sched_do_timer_tick(); !! 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 >> 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(struct digit), 0); >> 087 SOS_ASSERT_FATAL(d != NULL); >> 088 d->value = value; >> 089 list_add_tail(*bn, d); 079 } 090 } 080 091 081 092 082 /* =========================================== !! 093 /* Add a new digit before the MSD */ 083 * Page fault exception handling !! 094 void bn_push_msd(big_number_t * bn, char value) 084 */ !! 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 } 085 102 086 103 087 /* Page fault exception handler with demand pa !! 104 /* Construct a big integer from a (machine) integer */ 088 static void pgflt_ex(int intid, struct sos_cpu !! 105 big_number_t bn_new(unsigned long int i) 089 { 106 { 090 static sos_ui32_t demand_paging_count = 0; !! 107 big_number_t retval; 091 sos_vaddr_t faulting_vaddr = sos_cpu_contex << 092 sos_paddr_t ppage_paddr; << 093 108 094 if (sos_cpu_context_is_in_user_mode(ctxt)) !! 109 list_init(retval); >> 110 do 095 { 111 { 096 /* User-mode page faults are considered !! 112 bn_push_msd(&retval, i%10); 097 moment */ !! 113 i /= 10; 098 sos_bochs_printf("Unresolved USER page F << 099 sos_cpu_context_get_PC( << 100 (unsigned)faulting_vadd << 101 (unsigned)sos_cpu_conte << 102 sos_bochs_printf("Terminating User threa << 103 sos_thread_exit(); << 104 } 114 } >> 115 while (i != 0); >> 116 >> 117 return retval; >> 118 } >> 119 105 120 106 /* Check if address is covered by any VMM ra !! 121 /* Create a new big integer from another big integer */ 107 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v !! 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) 108 { 130 { 109 /* No: The page fault is out of any kern !! 131 bn_push_lsd(&retval, d->value); 110 the moment, we don't handle this. */ << 111 sos_display_fatal_error("Unresolved page << 112 sos_cpu_context_ << 113 (unsigned)faulti << 114 (unsigned)sos_cp << 115 SOS_ASSERT_FATAL(! "Got page fault (note << 116 } 132 } 117 133 118 !! 134 return retval; 119 /* << 120 * Demand paging in kernel space << 121 */ << 122 << 123 /* Update the number of demand paging reques << 124 demand_paging_count ++; << 125 display_bits(0, 0, << 126 SOS_X86_VIDEO_FG_LTRED | SOS_X8 << 127 demand_paging_count); << 128 << 129 /* Allocate a new page for the virtual addre << 130 ppage_paddr = sos_physmem_ref_physpage_new(F << 131 if (! ppage_paddr) << 132 SOS_ASSERT_FATAL(! "TODO: implement swap. << 133 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp << 134 SO << 135 FA << 136 SO << 137 | << 138 | << 139 sos_physmem_unref_physpage(ppage_paddr); << 140 << 141 /* Ok, we can now return to interrupted cont << 142 } 135 } 143 136 144 137 145 /* =========================================== !! 138 /* Free the memory used by a big integer */ 146 * Demonstrate the use of SOS kernel threads !! 139 void bn_del(big_number_t * bn) 147 * - Kernel Threads are created with various << 148 * state is printed on both the console and << 149 * - For tests regarding threads' synchroniza << 150 */ << 151 << 152 struct thr_arg << 153 { 140 { 154 char character; !! 141 struct digit *d; 155 int color; << 156 142 157 int col; !! 143 list_collapse(*bn, d) 158 int row; !! 144 { 159 }; !! 145 sos_kfree((sos_vaddr_t)d); >> 146 } >> 147 } 160 148 161 149 162 static void demo_thread(void *arg) !! 150 /* Shift left a big integer: bn := bn*10^shift */ >> 151 void bn_shift(big_number_t *bn, int shift) 163 { 152 { 164 struct thr_arg *thr_arg = (struct thr_arg*)a !! 153 for ( ; shift > 0 ; shift --) 165 int progress = 0; << 166 << 167 sos_bochs_printf("start %c", thr_arg->charac << 168 while (1) << 169 { 154 { 170 progress ++; !! 155 bn_push_lsd(bn, 0); 171 display_bits(thr_arg->row, thr_arg->col+ !! 156 } >> 157 } 172 158 173 sos_bochs_putchar(thr_arg->character); << 174 159 175 /* Yield the CPU to another thread somet !! 160 /* Dump the big integer in bochs */ 176 if ((random() % 100) == 0) !! 161 void bn_print_bochs(const big_number_t bn) 177 { !! 162 { 178 sos_bochs_printf("[37myield(%c)[m\ !! 163 int nb_elts; 179 sos_x86_videomem_putchar(thr_arg->ro !! 164 const struct digit *d; 180 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 181 sos_x86_videomem_putchar(thr_arg->ro << 182 } << 183 165 184 /* Go to sleep some other times... */ !! 166 if (list_is_empty(bn)) 185 else if ((random() % 200) == 0) !! 167 sos_bochs_printf("0"); 186 { !! 168 else 187 struct sos_time t = (struct sos_time !! 169 list_foreach(bn, d, nb_elts) 188 sos_bochs_printf("[37msleep1(%c)[m !! 170 sos_bochs_printf("%d", d->value); 189 sos_x86_videomem_putchar(thr_arg->ro !! 171 } 190 SOS_ASSERT_FATAL(SOS_OK == sos_threa !! 172 191 SOS_ASSERT_FATAL(sos_time_is_zero(& !! 173 /* Dump the big integer on the console */ 192 sos_x86_videomem_putchar(thr_arg->ro !! 174 void bn_print_console(unsigned char row, unsigned char col, 193 } !! 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; 194 186 195 /* Go to sleep for a longer time some ot !! 187 list_foreach(bn, d, nb_elts) 196 else if ((random() % 300) == 0) << 197 { 188 { 198 struct sos_time t = (struct sos_time !! 189 if (nb_elts == 0) 199 sos_bochs_printf("[37msleep2(%c)[m !! 190 { 200 sos_x86_videomem_putchar(thr_arg->ro !! 191 sos_x86_videomem_printf(row, x, attribute, "%d.", d->value); 201 SOS_ASSERT_FATAL(SOS_OK == sos_threa !! 192 x += 2; 202 SOS_ASSERT_FATAL(sos_time_is_zero(& !! 193 } 203 sos_x86_videomem_putchar(thr_arg->ro !! 194 else if (nb_elts < nb_decimals) >> 195 { >> 196 sos_x86_videomem_printf(row, x, attribute, "%d", d->value); >> 197 x ++; >> 198 } 204 } 199 } 205 200 206 /* Infinite loop otherwise */ !! 201 sos_x86_videomem_printf(row, x, attribute, " . 10^{%d} ", nb_elts-1); 207 } 202 } 208 } 203 } 209 204 210 205 211 static void test_thread() !! 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) 212 { 208 { 213 /* "static" variables because we want them t !! 209 big_number_t retval; 214 function returns */ !! 210 const struct digit *d1, *d2; 215 static struct thr_arg arg_b, arg_c, arg_d, a !! 211 sos_bool_t bn1_end = FALSE, bn2_end = FALSE; 216 sos_ui32_t flags; !! 212 char carry = 0; 217 !! 213 218 sos_disable_IRQs(flags); !! 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); 219 239 220 arg_b = (struct thr_arg) { .character='b', . !! 240 if (carry > 0) 221 sos_create_kernel_thread("YO[b]", demo_threa !! 241 { >> 242 bn_push_msd(&retval, carry); >> 243 } 222 244 223 arg_c = (struct thr_arg) { .character='c', . !! 245 return retval; 224 sos_create_kernel_thread("YO[c]", demo_threa !! 246 } 225 247 226 arg_d = (struct thr_arg) { .character='d', . << 227 sos_create_kernel_thread("YO[d]", demo_threa << 228 248 229 arg_e = (struct thr_arg) { .character='e', . !! 249 /* Result is the multiplication of a big integer by a single digit */ 230 sos_create_kernel_thread("YO[e]", demo_threa !! 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; 231 256 232 arg_R = (struct thr_arg) { .character='R', . !! 257 list_init(retval); 233 sos_create_kernel_thread("YO[R]", demo_threa !! 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 } 234 264 235 arg_S = (struct thr_arg) { .character='S', . !! 265 if (carry > 0) 236 sos_create_kernel_thread("YO[S]", demo_threa !! 266 { >> 267 bn_push_msd(&retval, carry); >> 268 } 237 269 238 sos_restore_IRQs(flags); !! 270 return retval; 239 } 271 } 240 272 241 273 242 /* =========================================== !! 274 /* Result is the multiplication of 2 big integers */ 243 * An operating system MUST always have a read !! 275 big_number_t bn_mult(const big_number_t bn1, const big_number_t bn2) 244 * what would the CPU have to execute ?! << 245 */ << 246 static void idle_thread() << 247 { 276 { 248 sos_ui32_t idle_twiddle = 0; !! 277 int shift = 0; >> 278 big_number_t retval; >> 279 int nb_elts; >> 280 struct digit *d; 249 281 250 while (1) !! 282 list_init(retval); >> 283 list_foreach_backward(bn2, d, nb_elts) 251 { 284 { 252 /* Remove this instruction if you get an !! 285 big_number_t retmult = bn_muli(bn1, d->value); 253 exception (old 80386 CPU) */ !! 286 big_number_t old_retval = retval; 254 asm("hlt\n"); !! 287 bn_shift(& retmult, shift); 255 !! 288 retval = bn_add(old_retval, retmult); 256 idle_twiddle ++; !! 289 bn_del(& retmult); 257 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE !! 290 bn_del(& old_retval); 258 idle_twiddle); !! 291 shift ++; 259 << 260 /* Lend the CPU to some other thread */ << 261 sos_thread_yield(); << 262 } 292 } >> 293 >> 294 return retval; 263 } 295 } 264 296 265 297 266 /* =========================================== !! 298 /* Result is the factorial of an integer */ 267 * Kernel thread showing some CPU usage statis !! 299 big_number_t bn_fact(unsigned long int v) 268 */ << 269 static void stat_thread() << 270 { 300 { 271 while (1) !! 301 unsigned long int i; >> 302 big_number_t retval = bn_new(1); >> 303 for (i = 1 ; i <= v ; i++) 272 { 304 { 273 sos_ui32_t flags; !! 305 big_number_t I = bn_new(i); 274 sos_ui32_t load1, load5, load15; !! 306 big_number_t tmp = bn_mult(retval, I); 275 char str1[11], str5[11], str15[11]; !! 307 sos_x86_videomem_printf(4, 0, 276 struct sos_time t; !! 308 SOS_X86_VIDEO_BG_BLUE | SOS_X86_VIDEO_FG_LTGREEN, 277 t.sec = 1; !! 309 "%d! = ", (int)i); 278 t.nanosec = 0; !! 310 bn_print_console(4, 8, SOS_X86_VIDEO_BG_BLUE | SOS_X86_VIDEO_FG_WHITE, 279 !! 311 tmp, 55); 280 sos_thread_sleep(& t); !! 312 bn_del(& I); 281 !! 313 bn_del(& retval); 282 sos_disable_IRQs(flags); !! 314 retval = tmp; 283 !! 315 } 284 /* The IDLE task is EXcluded in the foll << 285 sos_load_get_sload(&load1, &load5, &load << 286 sos_load_to_string(str1, load1); << 287 sos_load_to_string(str5, load5); << 288 sos_load_to_string(str15, load15); << 289 sos_x86_videomem_printf(16, 34, << 290 SOS_X86_VIDEO_FG << 291 "Kernel (- Idle) << 292 str1, str5, str1 << 293 316 294 sos_load_get_uload(&load1, &load5, &load !! 317 return retval; 295 sos_load_to_string(str1, load1); !! 318 } 296 sos_load_to_string(str5, load5); << 297 sos_load_to_string(str15, load15); << 298 sos_x86_videomem_printf(17, 34, << 299 SOS_X86_VIDEO_FG << 300 "User: %s %s %s << 301 str1, str5, str1 << 302 319 303 sos_load_get_uratio(&load1, &load5, &loa << 304 sos_load_to_string(str1, load1); << 305 sos_load_to_string(str5, load5); << 306 sos_load_to_string(str15, load15); << 307 sos_x86_videomem_printf(18, 34, << 308 SOS_X86_VIDEO_FG << 309 "User CPU %%: %s << 310 str1, str5, str1 << 311 320 312 /* The IDLE task is INcluded in the foll !! 321 void bn_test() 313 sos_load_get_sratio(&load1, &load5, &loa !! 322 { 314 sos_load_to_string(str1, load1); !! 323 big_number_t bn = bn_fact(1000); 315 sos_load_to_string(str5, load5); !! 324 sos_bochs_printf("1000! = "); 316 sos_load_to_string(str15, load15); !! 325 bn_print_bochs(bn); 317 sos_x86_videomem_printf(19, 34, !! 326 sos_bochs_printf("\n"); 318 SOS_X86_VIDEO_FG !! 327 319 "Kernel CPU %% ( << 320 str1, str5, str1 << 321 sos_restore_IRQs(flags); << 322 } << 323 } 328 } 324 329 325 330 326 /* =========================================== !! 331 /* The C entry point of our operating system */ 327 * The C entry point of our operating system << 328 */ << 329 void sos_main(unsigned long magic, unsigned lo 332 void sos_main(unsigned long magic, unsigned long addr) 330 { 333 { 331 unsigned i; 334 unsigned i; 332 sos_paddr_t sos_kernel_core_base_paddr, sos_ 335 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 333 struct sos_time tick_resolution; << 334 336 335 /* Grub sends us a structure, called multibo 337 /* Grub sends us a structure, called multiboot_info_t with a lot of 336 precious informations about the system, s 338 precious informations about the system, see the multiboot 337 documentation for more information. */ 339 documentation for more information. */ 338 multiboot_info_t *mbi; 340 multiboot_info_t *mbi; 339 mbi = (multiboot_info_t *) addr; 341 mbi = (multiboot_info_t *) addr; 340 342 341 /* Setup bochs and console, and clear the co 343 /* Setup bochs and console, and clear the console */ 342 sos_bochs_setup(); 344 sos_bochs_setup(); 343 345 344 sos_x86_videomem_setup(); 346 sos_x86_videomem_setup(); 345 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 347 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 346 348 347 /* Greetings from SOS */ 349 /* Greetings from SOS */ 348 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 350 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 349 /* Loaded with Grub */ 351 /* Loaded with Grub */ 350 sos_x86_videomem_printf(1, 0, 352 sos_x86_videomem_printf(1, 0, 351 SOS_X86_VIDEO_FG_Y 353 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 352 "Welcome From GRUB 354 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 353 "SOS article 7", ' !! 355 "SOS", ',', 354 (unsigned)(mbi->me 356 (unsigned)(mbi->mem_upper >> 10) + 1, 355 (unsigned)mbi->mem 357 (unsigned)mbi->mem_upper); 356 else 358 else 357 /* Not loaded with grub */ 359 /* Not loaded with grub */ 358 sos_x86_videomem_printf(1, 0, 360 sos_x86_videomem_printf(1, 0, 359 SOS_X86_VIDEO_FG_Y 361 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 360 "Welcome to SOS ar !! 362 "Welcome to SOS"); 361 363 362 sos_bochs_putstring("Message in a bochs: Thi !! 364 sos_bochs_putstring("Message in a bochs\n"); 363 365 364 /* Setup CPU segmentation and IRQ subsystem 366 /* Setup CPU segmentation and IRQ subsystem */ 365 sos_gdt_subsystem_setup(); !! 367 sos_gdt_setup(); 366 sos_idt_subsystem_setup(); !! 368 sos_idt_setup(); 367 369 368 /* Setup SOS IRQs and exceptions subsystem * 370 /* Setup SOS IRQs and exceptions subsystem */ 369 sos_exception_subsystem_setup(); !! 371 sos_exceptions_setup(); 370 sos_irq_subsystem_setup(); !! 372 sos_irq_setup(); 371 373 372 /* Configure the timer so as to raise the IR 374 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 373 sos_i8254_set_frequency(100); 375 sos_i8254_set_frequency(100); 374 376 375 /* Setup the kernel time subsystem to get pr << 376 ticks into account */ << 377 tick_resolution = (struct sos_time) { .sec=0 << 378 sos_time_subsysem_setup(& tick_resolution); << 379 377 380 /* We need a multiboot-compliant boot loader 378 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 381 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 379 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 382 { 380 { 383 sos_x86_videomem_putstring(20, 0, 381 sos_x86_videomem_putstring(20, 0, 384 SOS_X86_VIDEO 382 SOS_X86_VIDEO_FG_LTRED 385 | SOS_X86_V 383 | SOS_X86_VIDEO_BG_BLUE 386 | SOS_X86_V 384 | SOS_X86_VIDEO_FG_BLINKING, 387 "I'm not load 385 "I'm not loaded with Grub !"); 388 /* STOP ! */ 386 /* STOP ! */ 389 for (;;) 387 for (;;) 390 continue; 388 continue; 391 } 389 } 392 390 393 /* << 394 * Some interrupt handlers << 395 */ << 396 << 397 /* Binding some HW interrupts and exceptions 391 /* Binding some HW interrupts and exceptions to software routines */ 398 sos_irq_set_routine(SOS_IRQ_TIMER, 392 sos_irq_set_routine(SOS_IRQ_TIMER, 399 clk_it); !! 393 clk_it); 400 !! 394 /* Enabling the HW interrupts here, this will make the timer HW 401 /* !! 395 interrupt call our clk_it handler */ 402 * Setup physical memory management !! 396 asm volatile ("sti\n"); 403 */ << 404 << 405 /* Multiboot says: "The value returned for u 397 /* Multiboot says: "The value returned for upper memory is maximally 406 the address of the first upper memory hol 398 the address of the first upper memory hole minus 1 megabyte.". It 407 also adds: "It is not guaranteed to be th 399 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 408 sos_physmem_subsystem_setup((mbi->mem_upper< !! 400 sos_physmem_setup((mbi->mem_upper<<10) + (1<<20), 409 & sos_kernel_cor !! 401 & sos_kernel_core_base_paddr, 410 & sos_kernel_cor !! 402 & sos_kernel_core_top_paddr); 411 403 412 /* 404 /* 413 * Switch to paged-memory mode 405 * Switch to paged-memory mode 414 */ 406 */ 415 407 416 /* Disabling interrupts should seem more cor 408 /* Disabling interrupts should seem more correct, but it's not really 417 necessary at this stage */ 409 necessary at this stage */ 418 SOS_ASSERT_FATAL(SOS_OK == !! 410 if (sos_paging_setup(sos_kernel_core_base_paddr, 419 sos_paging_subsystem_setup( !! 411 sos_kernel_core_top_paddr)) 420 !! 412 sos_bochs_printf("Could not setup paged memory mode\n"); 421 !! 413 sos_x86_videomem_printf(2, 0, 422 /* Bind the page fault exception */ !! 414 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 423 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA !! 415 "Paged-memory mode is activated"); 424 pgflt_ex); << 425 416 426 /* << 427 * Setup kernel virtual memory allocator << 428 */ << 429 417 430 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ !! 418 if (sos_kmem_vmm_setup(sos_kernel_core_base_paddr, 431 sos_kernel_ !! 419 sos_kernel_core_top_paddr)) 432 bootstrap_s << 433 bootstrap_s << 434 + bootstrap << 435 sos_bochs_printf("Could not setup the Kern 420 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 436 421 437 if (sos_kmalloc_subsystem_setup()) !! 422 if (sos_kmalloc_setup()) 438 sos_bochs_printf("Could not setup the Kmal 423 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 439 424 440 /* !! 425 /* Run some kmalloc tests */ 441 * Initialize the MMU context subsystem !! 426 bn_test(); 442 */ << 443 sos_mm_context_subsystem_setup(); << 444 << 445 /* << 446 * Initialize the CPU context subsystem << 447 */ << 448 sos_cpu_context_subsystem_setup(); << 449 << 450 /* << 451 * Bind the syscall handler to its software << 452 */ << 453 sos_swintr_subsystem_setup(); << 454 << 455 << 456 /* << 457 * Initialize the Kernel thread and schedule << 458 */ << 459 << 460 /* Initialize kernel thread subsystem */ << 461 sos_thread_subsystem_setup(bootstrap_stack_b << 462 bootstrap_stack_s << 463 << 464 /* Initialize the scheduler */ << 465 sos_sched_subsystem_setup(); << 466 << 467 /* Declare the IDLE thread */ << 468 SOS_ASSERT_FATAL(sos_create_kernel_thread("i << 469 SO << 470 << 471 /* Prepare the stats subsystem */ << 472 sos_load_subsystem_setup(); << 473 << 474 /* Declare a thread that prints some stats * << 475 SOS_ASSERT_FATAL(sos_create_kernel_thread("s << 476 NU << 477 SO << 478 << 479 << 480 /* << 481 * Initialize process stuff << 482 */ << 483 sos_process_subsystem_setup(); << 484 427 >> 428 /* An operatig system never ends */ >> 429 for (;;) >> 430 continue; 485 431 486 /* Enabling the HW interrupts here, this wil !! 432 return; 487 interrupt call the scheduler */ << 488 asm volatile ("sti\n"); << 489 << 490 /* Run some tests involving USER processes a << 491 extern void test_art7(); << 492 test_art7(); << 493 << 494 /* Now run some Kernel threads just for fun << 495 extern void MouseSim(); << 496 MouseSim(); << 497 test_thread(); << 498 << 499 /* << 500 * We can safely exit from this function now << 501 * an idle Kernel thread ready to make the C << 502 * << 503 * However, we must EXPLICITELY call sos_thr << 504 * simple "return" will return nowhere ! Act << 505 * was initialized by the Grub bootstrap sta << 506 * word "thread" did not exist. This means t << 507 * setup in order for a return here to call << 508 * automagically. Hence we must call it manu << 509 * kernel thread where we must do this manua << 510 */ << 511 sos_bochs_printf("Bye from primary thread !\ << 512 sos_thread_exit(); << 513 SOS_FATAL_ERROR("No trespassing !"); << 514 } 433 }
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