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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/umem_vmm.h> << 037 #include <sos/klibc.h> 032 #include <sos/klibc.h> 038 #include <sos/assert.h> 033 #include <sos/assert.h> 039 #include <drivers/x86_videomem.h> 034 #include <drivers/x86_videomem.h> 040 #include <drivers/bochs.h> 035 #include <drivers/bochs.h> 041 #include <sos/calcload.h> << 042 #include <sos/umem_vmm.h> << 043 #include <sos/binfmt_elf32.h> << 044 #include <drivers/zero.h> << 045 036 046 037 047 /* Helper function to display each bits of a 3 038 /* Helper function to display each bits of a 32bits integer on the 048 screen as dark or light carrets */ 039 screen as dark or light carrets */ 049 void display_bits(unsigned char row, unsigned !! 040 static void display_bits(unsigned char row, unsigned char col, 050 unsigned char attribute, !! 041 unsigned char attribute, 051 sos_ui32_t integer) !! 042 sos_ui32_t integer) 052 { 043 { 053 int i; 044 int i; 054 /* Scan each bit of the integer, MSb first * 045 /* Scan each bit of the integer, MSb first */ 055 for (i = 31 ; i >= 0 ; i--) 046 for (i = 31 ; i >= 0 ; i--) 056 { 047 { 057 /* Test if bit i of 'integer' is set */ 048 /* Test if bit i of 'integer' is set */ 058 int bit_i = (integer & (1 << i)); 049 int bit_i = (integer & (1 << i)); 059 /* Ascii 219 => dark carret, Ascii 177 = 050 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 060 unsigned char ascii_code = bit_i?219:177 051 unsigned char ascii_code = bit_i?219:177; 061 sos_x86_videomem_putchar(row, col++, 052 sos_x86_videomem_putchar(row, col++, 062 attribute, 053 attribute, 063 ascii_code); 054 ascii_code); 064 } 055 } 065 } 056 } 066 057 067 058 068 /* Clock IRQ handler */ 059 /* Clock IRQ handler */ 069 static void clk_it(int intid) 060 static void clk_it(int intid) 070 { 061 { 071 static sos_ui32_t clock_count = 0; 062 static sos_ui32_t clock_count = 0; 072 063 073 display_bits(0, 48, 064 display_bits(0, 48, 074 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 065 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 075 clock_count); 066 clock_count); 076 clock_count++; 067 clock_count++; 077 068 078 /* Execute the expired timeout actions (if a !! 069 } 079 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 >> 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); >> 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(struct digit), 0); >> 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) integer */ >> 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); 080 116 081 /* Update scheduler statistics and status */ !! 117 return retval; 082 sos_sched_do_timer_tick(); << 083 } 118 } 084 119 085 120 086 /* =========================================== !! 121 /* Create a new big integer from another big integer */ 087 * Page fault exception handling !! 122 big_number_t bn_copy(const big_number_t bn) 088 */ !! 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 } 089 136 090 137 091 /* Page fault exception handler with demand pa !! 138 /* Free the memory used by a big integer */ 092 static void pgflt_ex(int intid, struct sos_cpu !! 139 void bn_del(big_number_t * bn) 093 { 140 { 094 static sos_ui32_t demand_paging_count = 0; !! 141 struct digit *d; 095 struct sos_thread * cur_thr = sos_thread_get << 096 sos_vaddr_t faulting_vaddr = sos_cpu_contex << 097 sos_paddr_t ppage_paddr; << 098 142 099 if (sos_cpu_context_is_in_user_mode(ctxt) !! 143 list_collapse(*bn, d) 100 || (cur_thr->fixup_uaccess.return_vaddr) << 101 { 144 { 102 __label__ unforce_address_space; !! 145 sos_kfree((sos_vaddr_t)d); 103 sos_bool_t need_to_setup_mmu; !! 146 } 104 sos_ui32_t errcode = sos_cpu_context_get !! 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 } 105 158 106 /* Make sure to always stay in the inter << 107 configuration */ << 108 need_to_setup_mmu = (cur_thr->squatted_m << 109 != sos_process_get_ << 110 if (need_to_setup_mmu) << 111 sos_thread_prepare_user_space_access(N << 112 159 113 if (SOS_OK == !! 160 /* Dump the big integer in bochs */ 114 sos_umem_vmm_try_resolve_page_fault( !! 161 void bn_print_bochs(const big_number_t bn) 115 !! 162 { 116 !! 163 int nb_elts; 117 goto unforce_address_space; !! 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, 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; 118 186 119 /* If the page fault occured in kernel m !! 187 list_foreach(bn, d, nb_elts) 120 the fixup address */ << 121 if (! sos_cpu_context_is_in_user_mode(ct << 122 { 188 { 123 cur_thr->fixup_uaccess.faulted_uaddr !! 189 if (nb_elts == 0) 124 sos_cpu_context_set_EX_return_addres !! 190 { 125 !! 191 sos_x86_videomem_printf(row, x, attribute, "%d.", d->value); 126 goto unforce_address_space; !! 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 } 127 } 199 } 128 200 129 if (need_to_setup_mmu) !! 201 sos_x86_videomem_printf(row, x, attribute, " . 10^{%d} ", nb_elts-1); 130 sos_thread_end_user_space_access(); !! 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; 131 256 132 sos_bochs_printf("Unresolved USER page F !! 257 list_init(retval); 133 sos_cpu_context_get_PC( !! 258 list_foreach_backward(bn, d, nb_elts) 134 (unsigned)faulting_vadd !! 259 { 135 (unsigned)sos_cpu_conte !! 260 carry += d->value * digit; 136 sos_bochs_printf("Terminating User threa !! 261 bn_push_msd(&retval, carry % 10); 137 sos_thread_exit(); !! 262 carry /= 10; 138 << 139 unforce_address_space: << 140 if (need_to_setup_mmu) << 141 sos_thread_end_user_space_access(); << 142 return; << 143 } << 144 << 145 /* Check if address is covered by any VMM ra << 146 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v << 147 { << 148 /* No: The page fault is out of any kern << 149 the moment, we don't handle this. */ << 150 sos_display_fatal_error("Unresolved page << 151 sos_cpu_context_ << 152 (unsigned)faulti << 153 (unsigned)sos_cp << 154 SOS_ASSERT_FATAL(! "Got page fault (note << 155 } 263 } 156 264 >> 265 if (carry > 0) >> 266 { >> 267 bn_push_msd(&retval, carry); >> 268 } 157 269 158 /* !! 270 return retval; 159 * Demand paging in kernel space !! 271 } 160 */ !! 272 161 !! 273 162 /* Update the number of demand paging reques !! 274 /* Result is the multiplication of 2 big integers */ 163 demand_paging_count ++; !! 275 big_number_t bn_mult(const big_number_t bn1, const big_number_t bn2) 164 display_bits(0, 0, !! 276 { 165 SOS_X86_VIDEO_FG_LTRED | SOS_X8 !! 277 int shift = 0; 166 demand_paging_count); !! 278 big_number_t retval; 167 !! 279 int nb_elts; 168 /* Allocate a new page for the virtual addre !! 280 struct digit *d; 169 ppage_paddr = sos_physmem_ref_physpage_new(F !! 281 170 if (! ppage_paddr) !! 282 list_init(retval); 171 SOS_ASSERT_FATAL(! "TODO: implement swap. !! 283 list_foreach_backward(bn2, d, nb_elts) 172 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp !! 284 { 173 SO !! 285 big_number_t retmult = bn_muli(bn1, d->value); 174 FA !! 286 big_number_t old_retval = retval; 175 SO !! 287 bn_shift(& retmult, shift); 176 | !! 288 retval = bn_add(old_retval, retmult); 177 | !! 289 bn_del(& retmult); 178 sos_physmem_unref_physpage(ppage_paddr); !! 290 bn_del(& old_retval); 179 !! 291 shift ++; 180 /* Ok, we can now return to interrupted cont !! 292 } 181 } !! 293 182 !! 294 return retval; 183 !! 295 } 184 !! 296 185 /* =========================================== !! 297 186 * An operating system MUST always have a read !! 298 /* Result is the factorial of an integer */ 187 * what would the CPU have to execute ?! !! 299 big_number_t bn_fact(unsigned long int v) 188 */ !! 300 { 189 static void idle_thread() !! 301 unsigned long int i; 190 { !! 302 big_number_t retval = bn_new(1); 191 sos_ui32_t idle_twiddle = 0; !! 303 for (i = 1 ; i <= v ; i++) 192 !! 304 { 193 while (1) !! 305 big_number_t I = bn_new(i); 194 { !! 306 big_number_t tmp = bn_mult(retval, I); 195 /* Remove this instruction if you get an !! 307 sos_x86_videomem_printf(4, 0, 196 exception (old 80386 CPU) */ !! 308 SOS_X86_VIDEO_BG_BLUE | SOS_X86_VIDEO_FG_LTGREEN, 197 asm("hlt\n"); !! 309 "%d! = ", (int)i); 198 !! 310 bn_print_console(4, 8, SOS_X86_VIDEO_BG_BLUE | SOS_X86_VIDEO_FG_WHITE, 199 idle_twiddle ++; !! 311 tmp, 55); 200 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE !! 312 bn_del(& I); 201 idle_twiddle); !! 313 bn_del(& retval); 202 !! 314 retval = tmp; 203 /* Lend the CPU to some other thread */ !! 315 } 204 sos_thread_yield(); !! 316 205 } !! 317 return retval; 206 } !! 318 } 207 !! 319 208 !! 320 209 /* =========================================== !! 321 void bn_test() 210 * Kernel thread showing some CPU usage statis !! 322 { 211 */ !! 323 big_number_t bn = bn_fact(1000); 212 static void stat_thread() !! 324 sos_bochs_printf("1000! = "); 213 { !! 325 bn_print_bochs(bn); 214 while (1) !! 326 sos_bochs_printf("\n"); 215 { !! 327 216 sos_ui32_t flags; !! 328 } 217 sos_ui32_t load1, load5, load15; !! 329 218 char str1[11], str5[11], str15[11]; !! 330 219 struct sos_time t; !! 331 /* The C entry point of our operating system */ 220 t.sec = 1; << 221 t.nanosec = 0; << 222 << 223 sos_thread_sleep(& t); << 224 << 225 sos_disable_IRQs(flags); << 226 << 227 /* The IDLE task is EXcluded in the foll << 228 sos_load_get_sload(&load1, &load5, &load << 229 sos_load_to_string(str1, load1); << 230 sos_load_to_string(str5, load5); << 231 sos_load_to_string(str15, load15); << 232 sos_x86_videomem_printf(16, 34, << 233 SOS_X86_VIDEO_FG << 234 "Kernel (- Idle) << 235 str1, str5, str1 << 236 << 237 sos_load_get_uload(&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(17, 34, << 242 SOS_X86_VIDEO_FG << 243 "User: %s %s %s << 244 str1, str5, str1 << 245 << 246 sos_load_get_uratio(&load1, &load5, &loa << 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(18, 34, << 251 SOS_X86_VIDEO_FG << 252 "User CPU %%: %s << 253 str1, str5, str1 << 254 << 255 /* The IDLE task is INcluded in the foll << 256 sos_load_get_sratio(&load1, &load5, &loa << 257 sos_load_to_string(str1, load1); << 258 sos_load_to_string(str5, load5); << 259 sos_load_to_string(str15, load15); << 260 sos_x86_videomem_printf(19, 34, << 261 SOS_X86_VIDEO_FG << 262 "Kernel CPU %% ( << 263 str1, str5, str1 << 264 sos_restore_IRQs(flags); << 265 } << 266 } << 267 << 268 << 269 /* =========================================== << 270 * Start the "init" (userland) process << 271 */ << 272 static sos_ret_t start_init() << 273 { << 274 sos_ret_t retval; << 275 struct sos_umem_vmm_as *as_init; << 276 struct sos_process *proc_init; << 277 struct sos_thread *new_thr; << 278 sos_uaddr_t ustack, start_uaddr; << 279 << 280 /* Create the new process */ << 281 proc_init = sos_process_create("init", FALSE << 282 if (! proc_init) << 283 return -SOS_ENOMEM; << 284 as_init = sos_process_get_address_space(proc << 285 << 286 /* Map the 'init' program in user space */ << 287 start_uaddr = sos_binfmt_elf32_map(as_init, << 288 if (0 == start_uaddr) << 289 { << 290 sos_process_unref(proc_init); << 291 return -SOS_ENOENT; << 292 } << 293 << 294 /* Allocate the user stack */ << 295 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ << 296 retval = sos_dev_zero_map(as_init, &ustack, << 297 SOS_VM_MAP_PROT_RE << 298 /* PRIVATE */ 0); << 299 if (SOS_OK != retval) << 300 { << 301 sos_bochs_printf("ici 2\n"); << 302 sos_process_unref(proc_init); << 303 return -SOS_ENOMEM; << 304 } << 305 << 306 /* Now create the user thread */ << 307 new_thr = sos_create_user_thread(NULL, << 308 proc_init, << 309 start_uaddr << 310 0, 0, << 311 ustack + SO << 312 SOS_SCHED_P << 313 if (! new_thr) << 314 { << 315 sos_bochs_printf("ici 3\n"); << 316 sos_process_unref(proc_init); << 317 return -SOS_ENOMEM; << 318 } << 319 << 320 sos_process_unref(proc_init); << 321 return SOS_OK; << 322 } << 323 << 324 << 325 /* =========================================== << 326 * The C entry point of our operating system << 327 */ << 328 void sos_main(unsigned long magic, unsigned lo 332 void sos_main(unsigned long magic, unsigned long addr) 329 { 333 { 330 unsigned i; 334 unsigned i; 331 sos_paddr_t sos_kernel_core_base_paddr, sos_ 335 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 332 struct sos_time tick_resolution; << 333 336 334 /* Grub sends us a structure, called multibo 337 /* Grub sends us a structure, called multiboot_info_t with a lot of 335 precious informations about the system, s 338 precious informations about the system, see the multiboot 336 documentation for more information. */ 339 documentation for more information. */ 337 multiboot_info_t *mbi; 340 multiboot_info_t *mbi; 338 mbi = (multiboot_info_t *) addr; 341 mbi = (multiboot_info_t *) addr; 339 342 340 /* Setup bochs and console, and clear the co 343 /* Setup bochs and console, and clear the console */ 341 sos_bochs_setup(); 344 sos_bochs_setup(); 342 345 343 sos_x86_videomem_setup(); 346 sos_x86_videomem_setup(); 344 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 347 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 345 348 346 /* Greetings from SOS */ 349 /* Greetings from SOS */ 347 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 350 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 348 /* Loaded with Grub */ 351 /* Loaded with Grub */ 349 sos_x86_videomem_printf(1, 0, 352 sos_x86_videomem_printf(1, 0, 350 SOS_X86_VIDEO_FG_Y 353 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 351 "Welcome From GRUB 354 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 352 "SOS article 7.5", !! 355 "SOS", ',', 353 (unsigned)(mbi->me 356 (unsigned)(mbi->mem_upper >> 10) + 1, 354 (unsigned)mbi->mem 357 (unsigned)mbi->mem_upper); 355 else 358 else 356 /* Not loaded with grub */ 359 /* Not loaded with grub */ 357 sos_x86_videomem_printf(1, 0, 360 sos_x86_videomem_printf(1, 0, 358 SOS_X86_VIDEO_FG_Y 361 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 359 "Welcome to SOS ar !! 362 "Welcome to SOS"); 360 363 361 sos_bochs_putstring("Message in a bochs: Thi !! 364 sos_bochs_putstring("Message in a bochs\n"); 362 365 363 /* Setup CPU segmentation and IRQ subsystem 366 /* Setup CPU segmentation and IRQ subsystem */ 364 sos_gdt_subsystem_setup(); !! 367 sos_gdt_setup(); 365 sos_idt_subsystem_setup(); !! 368 sos_idt_setup(); 366 369 367 /* Setup SOS IRQs and exceptions subsystem * 370 /* Setup SOS IRQs and exceptions subsystem */ 368 sos_exception_subsystem_setup(); !! 371 sos_exceptions_setup(); 369 sos_irq_subsystem_setup(); !! 372 sos_irq_setup(); 370 373 371 /* Configure the timer so as to raise the IR 374 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 372 sos_i8254_set_frequency(100); 375 sos_i8254_set_frequency(100); 373 376 374 /* Setup the kernel time subsystem to get pr << 375 ticks into account */ << 376 tick_resolution = (struct sos_time) { .sec=0 << 377 sos_time_subsysem_setup(& tick_resolution); << 378 377 379 /* We need a multiboot-compliant boot loader 378 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 380 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 379 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 381 { 380 { 382 sos_x86_videomem_putstring(20, 0, 381 sos_x86_videomem_putstring(20, 0, 383 SOS_X86_VIDEO 382 SOS_X86_VIDEO_FG_LTRED 384 | SOS_X86_V 383 | SOS_X86_VIDEO_BG_BLUE 385 | SOS_X86_V 384 | SOS_X86_VIDEO_FG_BLINKING, 386 "I'm not load 385 "I'm not loaded with Grub !"); 387 /* STOP ! */ 386 /* STOP ! */ 388 for (;;) 387 for (;;) 389 continue; 388 continue; 390 } 389 } 391 390 392 /* << 393 * Some interrupt handlers << 394 */ << 395 << 396 /* Binding some HW interrupts and exceptions 391 /* Binding some HW interrupts and exceptions to software routines */ 397 sos_irq_set_routine(SOS_IRQ_TIMER, 392 sos_irq_set_routine(SOS_IRQ_TIMER, 398 clk_it); !! 393 clk_it); 399 !! 394 /* Enabling the HW interrupts here, this will make the timer HW 400 /* !! 395 interrupt call our clk_it handler */ 401 * Setup physical memory management !! 396 asm volatile ("sti\n"); 402 */ << 403 << 404 /* Multiboot says: "The value returned for u 397 /* Multiboot says: "The value returned for upper memory is maximally 405 the address of the first upper memory hol 398 the address of the first upper memory hole minus 1 megabyte.". It 406 also adds: "It is not guaranteed to be th 399 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 407 sos_physmem_subsystem_setup((mbi->mem_upper< !! 400 sos_physmem_setup((mbi->mem_upper<<10) + (1<<20), 408 & sos_kernel_cor !! 401 & sos_kernel_core_base_paddr, 409 & sos_kernel_cor !! 402 & sos_kernel_core_top_paddr); 410 403 411 /* 404 /* 412 * Switch to paged-memory mode 405 * Switch to paged-memory mode 413 */ 406 */ 414 407 415 /* Disabling interrupts should seem more cor 408 /* Disabling interrupts should seem more correct, but it's not really 416 necessary at this stage */ 409 necessary at this stage */ 417 SOS_ASSERT_FATAL(SOS_OK == !! 410 if (sos_paging_setup(sos_kernel_core_base_paddr, 418 sos_paging_subsystem_setup( !! 411 sos_kernel_core_top_paddr)) 419 !! 412 sos_bochs_printf("Could not setup paged memory mode\n"); 420 !! 413 sos_x86_videomem_printf(2, 0, 421 /* Bind the page fault exception */ !! 414 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 422 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA !! 415 "Paged-memory mode is activated"); 423 pgflt_ex); << 424 416 425 /* << 426 * Setup kernel virtual memory allocator << 427 */ << 428 417 429 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ !! 418 if (sos_kmem_vmm_setup(sos_kernel_core_base_paddr, 430 sos_kernel_ !! 419 sos_kernel_core_top_paddr)) 431 bootstrap_s << 432 bootstrap_s << 433 + bootstrap << 434 sos_bochs_printf("Could not setup the Kern 420 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 435 421 436 if (sos_kmalloc_subsystem_setup()) !! 422 if (sos_kmalloc_setup()) 437 sos_bochs_printf("Could not setup the Kmal 423 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 438 424 439 /* !! 425 /* Run some kmalloc tests */ 440 * Initialize the MMU context subsystem !! 426 bn_test(); 441 */ << 442 sos_mm_context_subsystem_setup(); << 443 << 444 /* << 445 * Initialize the CPU context subsystem << 446 */ << 447 sos_cpu_context_subsystem_setup(); << 448 427 449 /* !! 428 /* An operatig system never ends */ 450 * Bind the syscall handler to its software !! 429 for (;;) 451 */ !! 430 continue; 452 sos_swintr_subsystem_setup(); << 453 << 454 << 455 /* << 456 * Initialize the Kernel thread and schedule << 457 */ << 458 << 459 /* Initialize kernel thread subsystem */ << 460 sos_thread_subsystem_setup(bootstrap_stack_b << 461 bootstrap_stack_s << 462 << 463 /* Initialize the scheduler */ << 464 sos_sched_subsystem_setup(); << 465 << 466 /* Declare the IDLE thread */ << 467 SOS_ASSERT_FATAL(sos_create_kernel_thread("i << 468 SO << 469 << 470 /* Prepare the stats subsystem */ << 471 sos_load_subsystem_setup(); << 472 << 473 /* Declare a thread that prints some stats * << 474 SOS_ASSERT_FATAL(sos_create_kernel_thread("s << 475 NU << 476 SO << 477 431 478 !! 432 return; 479 /* << 480 * Initialise user address space management << 481 */ << 482 sos_umem_vmm_subsystem_setup(); << 483 sos_dev_zero_subsystem_setup(); << 484 << 485 /* << 486 * Initialize process stuff << 487 */ << 488 sos_process_subsystem_setup(); << 489 << 490 << 491 /* Enabling the HW interrupts here, this wil << 492 interrupt call the scheduler */ << 493 asm volatile ("sti\n"); << 494 << 495 /* Start the 'init' process, which in turns << 496 programs */ << 497 start_init(); << 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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