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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 << 003 002 004 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 005 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 006 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 007 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 008 007 009 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU General Public License for more details 011 GNU General Public License for more details. 013 012 014 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 015 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 017 USA. 016 USA. 018 */ 017 */ 019 018 020 /* Include definitions of the multiboot standa 019 /* Include definitions of the multiboot standard */ 021 #include <bootstrap/multiboot.h> 020 #include <bootstrap/multiboot.h> 022 #include <hwcore/idt.h> 021 #include <hwcore/idt.h> 023 #include <hwcore/gdt.h> 022 #include <hwcore/gdt.h> 024 #include <hwcore/irq.h> 023 #include <hwcore/irq.h> 025 #include <hwcore/exception.h> 024 #include <hwcore/exception.h> 026 #include <hwcore/i8254.h> 025 #include <hwcore/i8254.h> 027 #include <sos/list.h> 026 #include <sos/list.h> 028 #include <sos/physmem.h> 027 #include <sos/physmem.h> 029 #include <hwcore/paging.h> 028 #include <hwcore/paging.h> >> 029 #include <hwcore/mm_context.h> >> 030 #include <hwcore/swintr.h> 030 #include <sos/kmem_vmm.h> 031 #include <sos/kmem_vmm.h> 031 #include <sos/kmalloc.h> 032 #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> 032 #include <sos/klibc.h> 037 #include <sos/klibc.h> 033 #include <sos/assert.h> 038 #include <sos/assert.h> 034 #include <drivers/x86_videomem.h> 039 #include <drivers/x86_videomem.h> 035 #include <drivers/bochs.h> 040 #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> 036 045 037 046 038 /* Helper function to display each bits of a 3 047 /* Helper function to display each bits of a 32bits integer on the 039 screen as dark or light carrets */ 048 screen as dark or light carrets */ 040 static void display_bits(unsigned char row, un !! 049 void display_bits(unsigned char row, unsigned char col, 041 unsigned char attribu !! 050 unsigned char attribute, 042 sos_ui32_t integer) !! 051 sos_ui32_t integer) 043 { 052 { 044 int i; 053 int i; 045 /* Scan each bit of the integer, MSb first * 054 /* Scan each bit of the integer, MSb first */ 046 for (i = 31 ; i >= 0 ; i--) 055 for (i = 31 ; i >= 0 ; i--) 047 { 056 { 048 /* Test if bit i of 'integer' is set */ 057 /* Test if bit i of 'integer' is set */ 049 int bit_i = (integer & (1 << i)); 058 int bit_i = (integer & (1 << i)); 050 /* Ascii 219 => dark carret, Ascii 177 = 059 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 051 unsigned char ascii_code = bit_i?219:177 060 unsigned char ascii_code = bit_i?219:177; 052 sos_x86_videomem_putchar(row, col++, 061 sos_x86_videomem_putchar(row, col++, 053 attribute, 062 attribute, 054 ascii_code); 063 ascii_code); 055 } 064 } 056 } 065 } 057 066 058 067 059 /* Clock IRQ handler */ 068 /* Clock IRQ handler */ 060 static void clk_it(int intid) 069 static void clk_it(int intid) 061 { 070 { 062 static sos_ui32_t clock_count = 0; 071 static sos_ui32_t clock_count = 0; 063 072 064 display_bits(0, 48, 073 display_bits(0, 48, 065 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 074 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 066 clock_count); 075 clock_count); 067 clock_count++; 076 clock_count++; 068 077 069 } !! 078 /* Execute the expired timeout actions (if any) */ 070 struct digit !! 079 sos_time_do_tick(); 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); << 116 080 117 return retval; !! 081 /* Update scheduler statistics and status */ >> 082 sos_sched_do_timer_tick(); 118 } 083 } 119 084 120 085 121 /* Create a new big integer from another big i !! 086 /* ====================================================================== 122 big_number_t bn_copy(const big_number_t bn) !! 087 * Page fault exception handling 123 { !! 088 */ 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 } << 136 089 137 090 138 /* Free the memory used by a big integer */ !! 091 /* Page fault exception handler with demand paging for the kernel */ 139 void bn_del(big_number_t * bn) !! 092 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 140 { 093 { 141 struct digit *d; !! 094 static sos_ui32_t demand_paging_count = 0; >> 095 struct sos_thread * cur_thr = sos_thread_get_current(); >> 096 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); >> 097 sos_paddr_t ppage_paddr; 142 098 143 list_collapse(*bn, d) !! 099 if (sos_cpu_context_is_in_user_mode(ctxt) >> 100 || (cur_thr->fixup_uaccess.return_vaddr)) 144 { 101 { 145 sos_kfree((sos_vaddr_t)d); !! 102 __label__ unforce_address_space; 146 } !! 103 sos_bool_t need_to_setup_mmu; 147 } !! 104 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); 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 } << 158 105 >> 106 /* Make sure to always stay in the interrupted thread's MMU >> 107 configuration */ >> 108 need_to_setup_mmu = (cur_thr->squatted_mm_context >> 109 != sos_process_get_mm_context(cur_thr->process)); >> 110 if (need_to_setup_mmu) >> 111 sos_thread_prepare_user_space_access(NULL, 0); 159 112 160 /* Dump the big integer in bochs */ !! 113 if (SOS_OK == 161 void bn_print_bochs(const big_number_t bn) !! 114 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, 162 { !! 115 errcode & (1 << 1), 163 int nb_elts; !! 116 TRUE)) 164 const struct digit *d; !! 117 goto unforce_address_space; 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; << 186 118 187 list_foreach(bn, d, nb_elts) !! 119 /* If the page fault occured in kernel mode, return to kernel to >> 120 the fixup address */ >> 121 if (! sos_cpu_context_is_in_user_mode(ctxt)) 188 { 122 { 189 if (nb_elts == 0) !! 123 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; 190 { !! 124 sos_cpu_context_set_EX_return_address(ctxt, 191 sos_x86_videomem_printf(row, x, !! 125 cur_thr->fixup_uaccess.return_vaddr); 192 x += 2; !! 126 goto unforce_address_space; 193 } << 194 else if (nb_elts < nb_decimals) << 195 { << 196 sos_x86_videomem_printf(row, x, << 197 x ++; << 198 } << 199 } 127 } 200 128 201 sos_x86_videomem_printf(row, x, attribut !! 129 if (need_to_setup_mmu) 202 } !! 130 sos_thread_end_user_space_access(); 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; << 256 131 257 list_init(retval); !! 132 sos_bochs_printf("Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\n", 258 list_foreach_backward(bn, d, nb_elts) !! 133 sos_cpu_context_get_PC(ctxt), 259 { !! 134 (unsigned)faulting_vaddr, 260 carry += d->value * digit; !! 135 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 261 bn_push_msd(&retval, carry % 10); !! 136 sos_bochs_printf("Terminating User thread\n"); 262 carry /= 10; !! 137 sos_thread_exit(); >> 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 range */ >> 146 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) >> 147 { >> 148 /* No: The page fault is out of any kernel virtual region. For >> 149 the moment, we don't handle this. */ >> 150 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", >> 151 sos_cpu_context_get_PC(ctxt), >> 152 (unsigned)faulting_vaddr, >> 153 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 154 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 263 } 155 } 264 156 265 if (carry > 0) << 266 { << 267 bn_push_msd(&retval, carry); << 268 } << 269 157 270 return retval; !! 158 /* 271 } !! 159 * Demand paging in kernel space 272 !! 160 */ 273 !! 161 274 /* Result is the multiplication of 2 big integ !! 162 /* Update the number of demand paging requests handled */ 275 big_number_t bn_mult(const big_number_t bn1, c !! 163 demand_paging_count ++; 276 { !! 164 display_bits(0, 0, 277 int shift = 0; !! 165 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 278 big_number_t retval; !! 166 demand_paging_count); 279 int nb_elts; !! 167 280 struct digit *d; !! 168 /* Allocate a new page for the virtual address */ 281 !! 169 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 282 list_init(retval); !! 170 if (! ppage_paddr) 283 list_foreach_backward(bn2, d, nb_elts) !! 171 SOS_ASSERT_FATAL(! "TODO: implement swap. (Out of mem in demand paging because no swap for kernel yet !)"); 284 { !! 172 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 285 big_number_t retmult = bn_muli(bn1, d->v !! 173 SOS_PAGE_ALIGN_INF(faulting_vaddr), 286 big_number_t old_retval = retval; !! 174 FALSE, 287 bn_shift(& retmult, shift); !! 175 SOS_VM_MAP_PROT_READ 288 retval = bn_add(old_retval, retmult); !! 176 | SOS_VM_MAP_PROT_WRITE 289 bn_del(& retmult); !! 177 | SOS_VM_MAP_ATOMIC)); 290 bn_del(& old_retval); !! 178 sos_physmem_unref_physpage(ppage_paddr); 291 shift ++; !! 179 292 } !! 180 /* Ok, we can now return to interrupted context */ 293 !! 181 } 294 return retval; !! 182 295 } !! 183 296 !! 184 297 !! 185 /* ====================================================================== 298 /* Result is the factorial of an integer */ !! 186 * An operating system MUST always have a ready thread ! Otherwise: 299 big_number_t bn_fact(unsigned long int v) !! 187 * what would the CPU have to execute ?! 300 { !! 188 */ 301 unsigned long int i; !! 189 static void idle_thread() 302 big_number_t retval = bn_new(1); !! 190 { 303 for (i = 1 ; i <= v ; i++) !! 191 sos_ui32_t idle_twiddle = 0; 304 { !! 192 305 big_number_t I = bn_new(i); !! 193 while (1) 306 big_number_t tmp = bn_mult(retval, I); !! 194 { 307 sos_x86_videomem_printf(4, 0, !! 195 /* Remove this instruction if you get an "Invalid opcode" CPU 308 SOS_X86_VIDEO_BG !! 196 exception (old 80386 CPU) */ 309 "%d! = ", (int)i !! 197 asm("hlt\n"); 310 bn_print_console(4, 8, SOS_X86_VIDEO_BG_ !! 198 311 tmp, 55); !! 199 idle_twiddle ++; 312 bn_del(& I); !! 200 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 313 bn_del(& retval); !! 201 idle_twiddle); 314 retval = tmp; !! 202 315 } !! 203 /* Lend the CPU to some other thread */ 316 !! 204 sos_thread_yield(); 317 return retval; !! 205 } 318 } !! 206 } 319 !! 207 320 !! 208 321 void bn_test() !! 209 /* ====================================================================== 322 { !! 210 * Kernel thread showing some CPU usage statistics on the console every 1s 323 big_number_t bn = bn_fact(1000); !! 211 */ 324 sos_bochs_printf("1000! = "); !! 212 static void stat_thread() 325 bn_print_bochs(bn); !! 213 { 326 sos_bochs_printf("\n"); !! 214 while (1) 327 !! 215 { 328 } !! 216 sos_ui32_t flags; 329 !! 217 sos_ui32_t load1, load5, load15; 330 !! 218 char str1[11], str5[11], str15[11]; 331 /* The C entry point of our operating system * !! 219 struct sos_time t; >> 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 following computation */ >> 228 sos_load_get_sload(&load1, &load5, &load15); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 234 "Kernel (- Idle): %s %s %s ", >> 235 str1, str5, str15); >> 236 >> 237 sos_load_get_uload(&load1, &load5, &load15); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 243 "User: %s %s %s ", >> 244 str1, str5, str15); >> 245 >> 246 sos_load_get_uratio(&load1, &load5, &load15); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 252 "User CPU %%: %s %s %s ", >> 253 str1, str5, str15); >> 254 >> 255 /* The IDLE task is INcluded in the following computation */ >> 256 sos_load_get_sratio(&load1, &load5, &load15); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 262 "Kernel CPU %% (+ Idle): %s %s %s ", >> 263 str1, str5, str15); >> 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_init); >> 285 >> 286 /* Map the 'init' program in user space */ >> 287 start_uaddr = sos_binfmt_elf32_map(as_init, "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_DEFAULT_USER_STACK_SIZE) + 1; >> 296 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, >> 297 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, >> 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 + SOS_DEFAULT_USER_STACK_SIZE - 4, >> 312 SOS_SCHED_PRIO_TS_LOWEST); >> 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 */ 332 void sos_main(unsigned long magic, unsigned lo 328 void sos_main(unsigned long magic, unsigned long addr) 333 { 329 { 334 unsigned i; 330 unsigned i; 335 sos_paddr_t sos_kernel_core_base_paddr, sos_ 331 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; >> 332 struct sos_time tick_resolution; 336 333 337 /* Grub sends us a structure, called multibo 334 /* Grub sends us a structure, called multiboot_info_t with a lot of 338 precious informations about the system, s 335 precious informations about the system, see the multiboot 339 documentation for more information. */ 336 documentation for more information. */ 340 multiboot_info_t *mbi; 337 multiboot_info_t *mbi; 341 mbi = (multiboot_info_t *) addr; 338 mbi = (multiboot_info_t *) addr; 342 339 343 /* Setup bochs and console, and clear the co 340 /* Setup bochs and console, and clear the console */ 344 sos_bochs_setup(); 341 sos_bochs_setup(); 345 342 346 sos_x86_videomem_setup(); 343 sos_x86_videomem_setup(); 347 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 344 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 348 345 349 /* Greetings from SOS */ 346 /* Greetings from SOS */ 350 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 347 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 351 /* Loaded with Grub */ 348 /* Loaded with Grub */ 352 sos_x86_videomem_printf(1, 0, 349 sos_x86_videomem_printf(1, 0, 353 SOS_X86_VIDEO_FG_Y 350 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 354 "Welcome From GRUB 351 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 355 "SOS", ',', !! 352 "SOS article 7.5", ',', 356 (unsigned)(mbi->me 353 (unsigned)(mbi->mem_upper >> 10) + 1, 357 (unsigned)mbi->mem 354 (unsigned)mbi->mem_upper); 358 else 355 else 359 /* Not loaded with grub */ 356 /* Not loaded with grub */ 360 sos_x86_videomem_printf(1, 0, 357 sos_x86_videomem_printf(1, 0, 361 SOS_X86_VIDEO_FG_Y 358 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 362 "Welcome to SOS"); !! 359 "Welcome to SOS article 7.5"); 363 360 364 sos_bochs_putstring("Message in a bochs\n"); !! 361 sos_bochs_putstring("Message in a bochs: This is SOS article 7.5.\n"); 365 362 366 /* Setup CPU segmentation and IRQ subsystem 363 /* Setup CPU segmentation and IRQ subsystem */ 367 sos_gdt_setup(); !! 364 sos_gdt_subsystem_setup(); 368 sos_idt_setup(); !! 365 sos_idt_subsystem_setup(); 369 366 370 /* Setup SOS IRQs and exceptions subsystem * 367 /* Setup SOS IRQs and exceptions subsystem */ 371 sos_exceptions_setup(); !! 368 sos_exception_subsystem_setup(); 372 sos_irq_setup(); !! 369 sos_irq_subsystem_setup(); 373 370 374 /* Configure the timer so as to raise the IR 371 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 375 sos_i8254_set_frequency(100); 372 sos_i8254_set_frequency(100); 376 373 >> 374 /* Setup the kernel time subsystem to get prepared to take the timer >> 375 ticks into account */ >> 376 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; >> 377 sos_time_subsysem_setup(& tick_resolution); 377 378 378 /* We need a multiboot-compliant boot loader 379 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 379 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 380 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 380 { 381 { 381 sos_x86_videomem_putstring(20, 0, 382 sos_x86_videomem_putstring(20, 0, 382 SOS_X86_VIDEO 383 SOS_X86_VIDEO_FG_LTRED 383 | SOS_X86_V 384 | SOS_X86_VIDEO_BG_BLUE 384 | SOS_X86_V 385 | SOS_X86_VIDEO_FG_BLINKING, 385 "I'm not load 386 "I'm not loaded with Grub !"); 386 /* STOP ! */ 387 /* STOP ! */ 387 for (;;) 388 for (;;) 388 continue; 389 continue; 389 } 390 } 390 391 >> 392 /* >> 393 * Some interrupt handlers >> 394 */ >> 395 391 /* Binding some HW interrupts and exceptions 396 /* Binding some HW interrupts and exceptions to software routines */ 392 sos_irq_set_routine(SOS_IRQ_TIMER, 397 sos_irq_set_routine(SOS_IRQ_TIMER, 393 clk_it); !! 398 clk_it); 394 /* Enabling the HW interrupts here, this wil !! 399 395 interrupt call our clk_it handler */ !! 400 /* 396 asm volatile ("sti\n"); !! 401 * Setup physical memory management >> 402 */ >> 403 397 /* Multiboot says: "The value returned for u 404 /* Multiboot says: "The value returned for upper memory is maximally 398 the address of the first upper memory hol 405 the address of the first upper memory hole minus 1 megabyte.". It 399 also adds: "It is not guaranteed to be th 406 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 400 sos_physmem_setup((mbi->mem_upper<<10) + (1< !! 407 sos_physmem_subsystem_setup((mbi->mem_upper<<10) + (1<<20), 401 & sos_kernel_core_base_pad !! 408 & sos_kernel_core_base_paddr, 402 & sos_kernel_core_top_padd !! 409 & sos_kernel_core_top_paddr); 403 410 404 /* 411 /* 405 * Switch to paged-memory mode 412 * Switch to paged-memory mode 406 */ 413 */ 407 414 408 /* Disabling interrupts should seem more cor 415 /* Disabling interrupts should seem more correct, but it's not really 409 necessary at this stage */ 416 necessary at this stage */ 410 if (sos_paging_setup(sos_kernel_core_base_pa !! 417 SOS_ASSERT_FATAL(SOS_OK == 411 sos_kernel_core_top_pad !! 418 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 412 sos_bochs_printf("Could not setup paged me !! 419 sos_kernel_core_top_paddr)); 413 sos_x86_videomem_printf(2, 0, !! 420 414 SOS_X86_VIDEO_FG_YEL !! 421 /* Bind the page fault exception */ 415 "Paged-memory mode i !! 422 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, >> 423 pgflt_ex); 416 424 >> 425 /* >> 426 * Setup kernel virtual memory allocator >> 427 */ 417 428 418 if (sos_kmem_vmm_setup(sos_kernel_core_base_ !! 429 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 419 sos_kernel_core_top_p !! 430 sos_kernel_core_top_paddr, >> 431 bootstrap_stack_bottom, >> 432 bootstrap_stack_bottom >> 433 + bootstrap_stack_size)) 420 sos_bochs_printf("Could not setup the Kern 434 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 421 435 422 if (sos_kmalloc_setup()) !! 436 if (sos_kmalloc_subsystem_setup()) 423 sos_bochs_printf("Could not setup the Kmal 437 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 424 438 425 /* Run some kmalloc tests */ !! 439 /* 426 bn_test(); !! 440 * Initialize the MMU context subsystem >> 441 */ >> 442 sos_mm_context_subsystem_setup(); >> 443 >> 444 /* >> 445 * Initialize the CPU context subsystem >> 446 */ >> 447 sos_cpu_context_subsystem_setup(); 427 448 428 /* An operatig system never ends */ !! 449 /* 429 for (;;) !! 450 * Bind the syscall handler to its software interrupt handler 430 continue; !! 451 */ >> 452 sos_swintr_subsystem_setup(); >> 453 >> 454 >> 455 /* >> 456 * Initialize the Kernel thread and scheduler subsystems >> 457 */ >> 458 >> 459 /* Initialize kernel thread subsystem */ >> 460 sos_thread_subsystem_setup(bootstrap_stack_bottom, >> 461 bootstrap_stack_size); >> 462 >> 463 /* Initialize the scheduler */ >> 464 sos_sched_subsystem_setup(); >> 465 >> 466 /* Declare the IDLE thread */ >> 467 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, >> 468 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 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("stat_thread", stat_thread, >> 475 NULL, >> 476 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 431 477 432 return; !! 478 >> 479 /* >> 480 * Initialise user address space management subsystem >> 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 will make the timer HW >> 492 interrupt call the scheduler */ >> 493 asm volatile ("sti\n"); >> 494 >> 495 /* Start the 'init' process, which in turns launches the other >> 496 programs */ >> 497 start_init(); >> 498 >> 499 /* >> 500 * We can safely exit from this function now, for there is already >> 501 * an idle Kernel thread ready to make the CPU busy working... >> 502 * >> 503 * However, we must EXPLICITELY call sos_thread_exit() because a >> 504 * simple "return" will return nowhere ! Actually this first thread >> 505 * was initialized by the Grub bootstrap stage, at a time when the >> 506 * word "thread" did not exist. This means that the stack was not >> 507 * setup in order for a return here to call sos_thread_exit() >> 508 * automagically. Hence we must call it manually. This is the ONLY >> 509 * kernel thread where we must do this manually. >> 510 */ >> 511 sos_bochs_printf("Bye from primary thread !\n"); >> 512 sos_thread_exit(); >> 513 SOS_FATAL_ERROR("No trespassing !"); 433 } 514 }
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