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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> 032 #include <sos/klibc.h> 036 #include <sos/klibc.h> 033 #include <sos/assert.h> 037 #include <sos/assert.h> 034 #include <drivers/x86_videomem.h> 038 #include <drivers/x86_videomem.h> 035 #include <drivers/bochs.h> 039 #include <drivers/bochs.h> >> 040 #include <sos/calcload.h> 036 041 037 042 038 /* Helper function to display each bits of a 3 043 /* Helper function to display each bits of a 32bits integer on the 039 screen as dark or light carrets */ 044 screen as dark or light carrets */ 040 static void display_bits(unsigned char row, un !! 045 void display_bits(unsigned char row, unsigned char col, 041 unsigned char attribu !! 046 unsigned char attribute, 042 sos_ui32_t integer) !! 047 sos_ui32_t integer) 043 { 048 { 044 int i; 049 int i; 045 /* Scan each bit of the integer, MSb first * 050 /* Scan each bit of the integer, MSb first */ 046 for (i = 31 ; i >= 0 ; i--) 051 for (i = 31 ; i >= 0 ; i--) 047 { 052 { 048 /* Test if bit i of 'integer' is set */ 053 /* Test if bit i of 'integer' is set */ 049 int bit_i = (integer & (1 << i)); 054 int bit_i = (integer & (1 << i)); 050 /* Ascii 219 => dark carret, Ascii 177 = 055 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 051 unsigned char ascii_code = bit_i?219:177 056 unsigned char ascii_code = bit_i?219:177; 052 sos_x86_videomem_putchar(row, col++, 057 sos_x86_videomem_putchar(row, col++, 053 attribute, 058 attribute, 054 ascii_code); 059 ascii_code); 055 } 060 } 056 } 061 } 057 062 058 063 059 /* Clock IRQ handler */ 064 /* Clock IRQ handler */ 060 static void clk_it(int intid) 065 static void clk_it(int intid) 061 { 066 { 062 static sos_ui32_t clock_count = 0; 067 static sos_ui32_t clock_count = 0; 063 068 064 display_bits(0, 48, 069 display_bits(0, 48, 065 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 070 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 066 clock_count); 071 clock_count); 067 clock_count++; 072 clock_count++; 068 073 069 } !! 074 /* Execute the expired timeout actions (if any) */ 070 struct digit !! 075 sos_time_do_tick(); 071 { << 072 struct digit *prev, *next; << 073 char value; << 074 }; << 075 076 076 /* Representation of a big (positive) integer: !! 077 /* Update scheduler statistics and status */ 077 (MSD) is the HEAD of the list. Least Signif !! 078 sos_sched_do_timer_tick(); 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 } 079 } 091 080 092 081 093 /* Add a new digit before the MSD */ !! 082 /* ====================================================================== 094 void bn_push_msd(big_number_t * bn, char value !! 083 * Page fault exception handling 095 { !! 084 */ 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 } << 102 085 103 086 104 /* Construct a big integer from a (machine) in !! 087 /* Page fault exception handler with demand paging for the kernel */ 105 big_number_t bn_new(unsigned long int i) !! 088 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 106 { 089 { 107 big_number_t retval; !! 090 static sos_ui32_t demand_paging_count = 0; >> 091 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); >> 092 sos_paddr_t ppage_paddr; 108 093 109 list_init(retval); !! 094 if (sos_cpu_context_is_in_user_mode(ctxt)) 110 do << 111 { 095 { 112 bn_push_msd(&retval, i%10); !! 096 /* User-mode page faults are considered unresolved for the 113 i /= 10; !! 097 moment */ >> 098 sos_bochs_printf("Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\n", >> 099 sos_cpu_context_get_PC(ctxt), >> 100 (unsigned)faulting_vaddr, >> 101 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 102 sos_bochs_printf("Terminating User thread\n"); >> 103 sos_thread_exit(); 114 } 104 } 115 while (i != 0); << 116 << 117 return retval; << 118 } << 119 << 120 105 121 /* Create a new big integer from another big i !! 106 /* Check if address is covered by any VMM range */ 122 big_number_t bn_copy(const big_number_t bn) !! 107 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 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 { 108 { 131 bn_push_lsd(&retval, d->value); !! 109 /* No: The page fault is out of any kernel virtual region. For >> 110 the moment, we don't handle this. */ >> 111 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", >> 112 sos_cpu_context_get_PC(ctxt), >> 113 (unsigned)faulting_vaddr, >> 114 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 115 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 132 } 116 } 133 117 134 return retval; !! 118 >> 119 /* >> 120 * Demand paging in kernel space >> 121 */ >> 122 >> 123 /* Update the number of demand paging requests handled */ >> 124 demand_paging_count ++; >> 125 display_bits(0, 0, >> 126 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, >> 127 demand_paging_count); >> 128 >> 129 /* Allocate a new page for the virtual address */ >> 130 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); >> 131 if (! ppage_paddr) >> 132 SOS_ASSERT_FATAL(! "TODO: implement swap. (Out of mem in demand paging because no swap for kernel yet !)"); >> 133 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, >> 134 SOS_PAGE_ALIGN_INF(faulting_vaddr), >> 135 FALSE, >> 136 SOS_VM_MAP_PROT_READ >> 137 | SOS_VM_MAP_PROT_WRITE >> 138 | SOS_VM_MAP_ATOMIC)); >> 139 sos_physmem_unref_physpage(ppage_paddr); >> 140 >> 141 /* Ok, we can now return to interrupted context */ 135 } 142 } 136 143 137 144 138 /* Free the memory used by a big integer */ !! 145 /* ====================================================================== 139 void bn_del(big_number_t * bn) !! 146 * Demonstrate the use of SOS kernel threads >> 147 * - Kernel Threads are created with various priorities and their >> 148 * state is printed on both the console and the bochs' 0xe9 port >> 149 * - For tests regarding threads' synchronization, see mouse_sim.c >> 150 */ >> 151 >> 152 struct thr_arg 140 { 153 { 141 struct digit *d; !! 154 char character; >> 155 int color; 142 156 143 list_collapse(*bn, d) !! 157 int col; 144 { !! 158 int row; 145 sos_kfree((sos_vaddr_t)d); !! 159 }; 146 } << 147 } << 148 160 149 161 150 /* Shift left a big integer: bn := bn*10^shift !! 162 static void demo_thread(void *arg) 151 void bn_shift(big_number_t *bn, int shift) << 152 { 163 { 153 for ( ; shift > 0 ; shift --) !! 164 struct thr_arg *thr_arg = (struct thr_arg*)arg; 154 { !! 165 int progress = 0; 155 bn_push_lsd(bn, 0); << 156 } << 157 } << 158 166 >> 167 sos_bochs_printf("start %c", thr_arg->character); >> 168 while (1) >> 169 { >> 170 progress ++; >> 171 display_bits(thr_arg->row, thr_arg->col+1, thr_arg->color, progress); 159 172 160 /* Dump the big integer in bochs */ !! 173 sos_bochs_putchar(thr_arg->character); 161 void bn_print_bochs(const big_number_t bn) << 162 { << 163 int nb_elts; << 164 const struct digit *d; << 165 174 166 if (list_is_empty(bn)) !! 175 /* Yield the CPU to another thread sometimes... */ 167 sos_bochs_printf("0"); !! 176 if ((random() % 100) == 0) 168 else !! 177 { 169 list_foreach(bn, d, nb_elts) !! 178 sos_bochs_printf("[37myield(%c)[m\n", thr_arg->character); 170 sos_bochs_printf("%d", d->value); !! 179 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'Y'); 171 } !! 180 SOS_ASSERT_FATAL(SOS_OK == sos_thread_yield()); >> 181 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); >> 182 } 172 183 173 /* Dump the big integer on the console */ !! 184 /* Go to sleep some other times... */ 174 void bn_print_console(unsigned char row, unsig !! 185 else if ((random() % 200) == 0) 175 unsigned char attribute, !! 186 { 176 const big_number_t bn, !! 187 struct sos_time t = (struct sos_time){ .sec=0, .nanosec=50000000 }; 177 int nb_decimals) !! 188 sos_bochs_printf("[37msleep1(%c)[m\n", thr_arg->character); 178 { !! 189 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 's'); 179 if (list_is_empty(bn)) !! 190 SOS_ASSERT_FATAL(SOS_OK == sos_thread_sleep(& t)); 180 sos_x86_videomem_printf(row, col, attribut !! 191 SOS_ASSERT_FATAL(sos_time_is_zero(& t)); 181 else !! 192 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); 182 { !! 193 } 183 int nb_elts; << 184 const struct digit *d; << 185 unsigned char x = col; << 186 194 187 list_foreach(bn, d, nb_elts) !! 195 /* Go to sleep for a longer time some other times... */ >> 196 else if ((random() % 300) == 0) 188 { 197 { 189 if (nb_elts == 0) !! 198 struct sos_time t = (struct sos_time){ .sec=0, .nanosec=300000000 }; 190 { !! 199 sos_bochs_printf("[37msleep2(%c)[m\n", thr_arg->character); 191 sos_x86_videomem_printf(row, x, !! 200 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'S'); 192 x += 2; !! 201 SOS_ASSERT_FATAL(SOS_OK == sos_thread_sleep(& t)); 193 } !! 202 SOS_ASSERT_FATAL(sos_time_is_zero(& t)); 194 else if (nb_elts < nb_decimals) !! 203 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); 195 { << 196 sos_x86_videomem_printf(row, x, << 197 x ++; << 198 } << 199 } 204 } 200 205 201 sos_x86_videomem_printf(row, x, attribut !! 206 /* Infinite loop otherwise */ 202 } 207 } 203 } 208 } 204 209 205 210 206 /* Result is the addition of 2 big integers */ !! 211 static void test_thread() 207 big_number_t bn_add (const big_number_t bn1, c << 208 { 212 { 209 big_number_t retval; !! 213 /* "static" variables because we want them to remain even when the 210 const struct digit *d1, *d2; !! 214 function returns */ 211 sos_bool_t bn1_end = FALSE, bn2_end = FALSE !! 215 static struct thr_arg arg_b, arg_c, arg_d, arg_e, arg_R, arg_S; 212 char carry = 0; !! 216 sos_ui32_t flags; 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); << 239 217 240 if (carry > 0) !! 218 sos_disable_IRQs(flags); 241 { << 242 bn_push_msd(&retval, carry); << 243 } << 244 219 245 return retval; !! 220 arg_b = (struct thr_arg) { .character='b', .col=0, .row=21, .color=0x14 }; 246 } !! 221 sos_create_kernel_thread("YO[b]", demo_thread, (void*)&arg_b, SOS_SCHED_PRIO_TS_LOWEST); 247 222 >> 223 arg_c = (struct thr_arg) { .character='c', .col=46, .row=21, .color=0x14 }; >> 224 sos_create_kernel_thread("YO[c]", demo_thread, (void*)&arg_c, SOS_SCHED_PRIO_TS_LOWEST); 248 225 249 /* Result is the multiplication of a big integ !! 226 arg_d = (struct thr_arg) { .character='d', .col=0, .row=20, .color=0x14 }; 250 big_number_t bn_muli (const big_number_t bn, c !! 227 sos_create_kernel_thread("YO[d]", demo_thread, (void*)&arg_d, SOS_SCHED_PRIO_TS_LOWEST-1); 251 { << 252 big_number_t retval; << 253 int nb_elts; << 254 char carry = 0; << 255 const struct digit *d; << 256 228 257 list_init(retval); !! 229 arg_e = (struct thr_arg) { .character='e', .col=0, .row=19, .color=0x14 }; 258 list_foreach_backward(bn, d, nb_elts) !! 230 sos_create_kernel_thread("YO[e]", demo_thread, (void*)&arg_e, SOS_SCHED_PRIO_TS_LOWEST-2); 259 { << 260 carry += d->value * digit; << 261 bn_push_msd(&retval, carry % 10); << 262 carry /= 10; << 263 } << 264 231 265 if (carry > 0) !! 232 arg_R = (struct thr_arg) { .character='R', .col=0, .row=17, .color=0x1c }; 266 { !! 233 sos_create_kernel_thread("YO[R]", demo_thread, (void*)&arg_R, SOS_SCHED_PRIO_RT_LOWEST); 267 bn_push_msd(&retval, carry); !! 234 268 } !! 235 arg_S = (struct thr_arg) { .character='S', .col=0, .row=16, .color=0x1c }; >> 236 sos_create_kernel_thread("YO[S]", demo_thread, (void*)&arg_S, SOS_SCHED_PRIO_RT_LOWEST-1); 269 237 270 return retval; !! 238 sos_restore_IRQs(flags); 271 } 239 } 272 240 273 241 274 /* Result is the multiplication of 2 big integ !! 242 /* ====================================================================== 275 big_number_t bn_mult(const big_number_t bn1, c !! 243 * An operating system MUST always have a ready thread ! Otherwise: >> 244 * what would the CPU have to execute ?! >> 245 */ >> 246 static void idle_thread() 276 { 247 { 277 int shift = 0; !! 248 sos_ui32_t idle_twiddle = 0; 278 big_number_t retval; << 279 int nb_elts; << 280 struct digit *d; << 281 249 282 list_init(retval); !! 250 while (1) 283 list_foreach_backward(bn2, d, nb_elts) << 284 { 251 { 285 big_number_t retmult = bn_muli(bn1, d->v !! 252 /* Remove this instruction if you get an "Invalid opcode" CPU 286 big_number_t old_retval = retval; !! 253 exception (old 80386 CPU) */ 287 bn_shift(& retmult, shift); !! 254 asm("hlt\n"); 288 retval = bn_add(old_retval, retmult); << 289 bn_del(& retmult); << 290 bn_del(& old_retval); << 291 shift ++; << 292 } << 293 255 294 return retval; !! 256 idle_twiddle ++; >> 257 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, >> 258 idle_twiddle); >> 259 >> 260 /* Lend the CPU to some other thread */ >> 261 sos_thread_yield(); >> 262 } 295 } 263 } 296 264 297 265 298 /* Result is the factorial of an integer */ !! 266 /* ====================================================================== 299 big_number_t bn_fact(unsigned long int v) !! 267 * Kernel thread showing some CPU usage statistics on the console every 1s >> 268 */ >> 269 static void stat_thread() 300 { 270 { 301 unsigned long int i; !! 271 while (1) 302 big_number_t retval = bn_new(1); << 303 for (i = 1 ; i <= v ; i++) << 304 { 272 { 305 big_number_t I = bn_new(i); !! 273 sos_ui32_t flags; 306 big_number_t tmp = bn_mult(retval, I); !! 274 sos_ui32_t load1, load5, load15; 307 sos_x86_videomem_printf(4, 0, !! 275 char str1[11], str5[11], str15[11]; 308 SOS_X86_VIDEO_BG !! 276 struct sos_time t; 309 "%d! = ", (int)i !! 277 t.sec = 1; 310 bn_print_console(4, 8, SOS_X86_VIDEO_BG_ !! 278 t.nanosec = 0; 311 tmp, 55); << 312 bn_del(& I); << 313 bn_del(& retval); << 314 retval = tmp; << 315 } << 316 279 317 return retval; !! 280 sos_thread_sleep(& t); 318 } << 319 281 >> 282 sos_disable_IRQs(flags); 320 283 321 void bn_test() !! 284 /* The IDLE task is EXcluded in the following computation */ 322 { !! 285 sos_load_get_sload(&load1, &load5, &load15); 323 big_number_t bn = bn_fact(1000); !! 286 sos_load_to_string(str1, load1); 324 sos_bochs_printf("1000! = "); !! 287 sos_load_to_string(str5, load5); 325 bn_print_bochs(bn); !! 288 sos_load_to_string(str15, load15); 326 sos_bochs_printf("\n"); !! 289 sos_x86_videomem_printf(16, 34, 327 !! 290 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 291 "Kernel (- Idle): %s %s %s ", >> 292 str1, str5, str15); >> 293 >> 294 sos_load_get_uload(&load1, &load5, &load15); >> 295 sos_load_to_string(str1, load1); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 300 "User: %s %s %s ", >> 301 str1, str5, str15); >> 302 >> 303 sos_load_get_uratio(&load1, &load5, &load15); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 309 "User CPU %%: %s %s %s ", >> 310 str1, str5, str15); >> 311 >> 312 /* The IDLE task is INcluded in the following computation */ >> 313 sos_load_get_sratio(&load1, &load5, &load15); >> 314 sos_load_to_string(str1, load1); >> 315 sos_load_to_string(str5, load5); >> 316 sos_load_to_string(str15, load15); >> 317 sos_x86_videomem_printf(19, 34, >> 318 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 319 "Kernel CPU %% (+ Idle): %s %s %s ", >> 320 str1, str5, str15); >> 321 sos_restore_IRQs(flags); >> 322 } 328 } 323 } 329 324 330 325 331 /* The C entry point of our operating system * !! 326 /* ====================================================================== >> 327 * The C entry point of our operating system >> 328 */ 332 void sos_main(unsigned long magic, unsigned lo 329 void sos_main(unsigned long magic, unsigned long addr) 333 { 330 { 334 unsigned i; 331 unsigned i; 335 sos_paddr_t sos_kernel_core_base_paddr, sos_ 332 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; >> 333 struct sos_time tick_resolution; 336 334 337 /* Grub sends us a structure, called multibo 335 /* Grub sends us a structure, called multiboot_info_t with a lot of 338 precious informations about the system, s 336 precious informations about the system, see the multiboot 339 documentation for more information. */ 337 documentation for more information. */ 340 multiboot_info_t *mbi; 338 multiboot_info_t *mbi; 341 mbi = (multiboot_info_t *) addr; 339 mbi = (multiboot_info_t *) addr; 342 340 343 /* Setup bochs and console, and clear the co 341 /* Setup bochs and console, and clear the console */ 344 sos_bochs_setup(); 342 sos_bochs_setup(); 345 343 346 sos_x86_videomem_setup(); 344 sos_x86_videomem_setup(); 347 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 345 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 348 346 349 /* Greetings from SOS */ 347 /* Greetings from SOS */ 350 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 348 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 351 /* Loaded with Grub */ 349 /* Loaded with Grub */ 352 sos_x86_videomem_printf(1, 0, 350 sos_x86_videomem_printf(1, 0, 353 SOS_X86_VIDEO_FG_Y 351 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 354 "Welcome From GRUB 352 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 355 "SOS", ',', !! 353 "SOS article 7", ',', 356 (unsigned)(mbi->me 354 (unsigned)(mbi->mem_upper >> 10) + 1, 357 (unsigned)mbi->mem 355 (unsigned)mbi->mem_upper); 358 else 356 else 359 /* Not loaded with grub */ 357 /* Not loaded with grub */ 360 sos_x86_videomem_printf(1, 0, 358 sos_x86_videomem_printf(1, 0, 361 SOS_X86_VIDEO_FG_Y 359 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 362 "Welcome to SOS"); !! 360 "Welcome to SOS article 7"); 363 361 364 sos_bochs_putstring("Message in a bochs\n"); !! 362 sos_bochs_putstring("Message in a bochs: This is SOS article 7.\n"); 365 363 366 /* Setup CPU segmentation and IRQ subsystem 364 /* Setup CPU segmentation and IRQ subsystem */ 367 sos_gdt_setup(); !! 365 sos_gdt_subsystem_setup(); 368 sos_idt_setup(); !! 366 sos_idt_subsystem_setup(); 369 367 370 /* Setup SOS IRQs and exceptions subsystem * 368 /* Setup SOS IRQs and exceptions subsystem */ 371 sos_exceptions_setup(); !! 369 sos_exception_subsystem_setup(); 372 sos_irq_setup(); !! 370 sos_irq_subsystem_setup(); 373 371 374 /* Configure the timer so as to raise the IR 372 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 375 sos_i8254_set_frequency(100); 373 sos_i8254_set_frequency(100); 376 374 >> 375 /* Setup the kernel time subsystem to get prepared to take the timer >> 376 ticks into account */ >> 377 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; >> 378 sos_time_subsysem_setup(& tick_resolution); 377 379 378 /* We need a multiboot-compliant boot loader 380 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 379 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 381 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 380 { 382 { 381 sos_x86_videomem_putstring(20, 0, 383 sos_x86_videomem_putstring(20, 0, 382 SOS_X86_VIDEO 384 SOS_X86_VIDEO_FG_LTRED 383 | SOS_X86_V 385 | SOS_X86_VIDEO_BG_BLUE 384 | SOS_X86_V 386 | SOS_X86_VIDEO_FG_BLINKING, 385 "I'm not load 387 "I'm not loaded with Grub !"); 386 /* STOP ! */ 388 /* STOP ! */ 387 for (;;) 389 for (;;) 388 continue; 390 continue; 389 } 391 } 390 392 >> 393 /* >> 394 * Some interrupt handlers >> 395 */ >> 396 391 /* Binding some HW interrupts and exceptions 397 /* Binding some HW interrupts and exceptions to software routines */ 392 sos_irq_set_routine(SOS_IRQ_TIMER, 398 sos_irq_set_routine(SOS_IRQ_TIMER, 393 clk_it); !! 399 clk_it); 394 /* Enabling the HW interrupts here, this wil !! 400 395 interrupt call our clk_it handler */ !! 401 /* 396 asm volatile ("sti\n"); !! 402 * Setup physical memory management >> 403 */ >> 404 397 /* Multiboot says: "The value returned for u 405 /* Multiboot says: "The value returned for upper memory is maximally 398 the address of the first upper memory hol 406 the address of the first upper memory hole minus 1 megabyte.". It 399 also adds: "It is not guaranteed to be th 407 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 400 sos_physmem_setup((mbi->mem_upper<<10) + (1< !! 408 sos_physmem_subsystem_setup((mbi->mem_upper<<10) + (1<<20), 401 & sos_kernel_core_base_pad !! 409 & sos_kernel_core_base_paddr, 402 & sos_kernel_core_top_padd !! 410 & sos_kernel_core_top_paddr); 403 411 404 /* 412 /* 405 * Switch to paged-memory mode 413 * Switch to paged-memory mode 406 */ 414 */ 407 415 408 /* Disabling interrupts should seem more cor 416 /* Disabling interrupts should seem more correct, but it's not really 409 necessary at this stage */ 417 necessary at this stage */ 410 if (sos_paging_setup(sos_kernel_core_base_pa !! 418 SOS_ASSERT_FATAL(SOS_OK == 411 sos_kernel_core_top_pad !! 419 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 412 sos_bochs_printf("Could not setup paged me !! 420 sos_kernel_core_top_paddr)); 413 sos_x86_videomem_printf(2, 0, !! 421 414 SOS_X86_VIDEO_FG_YEL !! 422 /* Bind the page fault exception */ 415 "Paged-memory mode i !! 423 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, >> 424 pgflt_ex); 416 425 >> 426 /* >> 427 * Setup kernel virtual memory allocator >> 428 */ 417 429 418 if (sos_kmem_vmm_setup(sos_kernel_core_base_ !! 430 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 419 sos_kernel_core_top_p !! 431 sos_kernel_core_top_paddr, >> 432 bootstrap_stack_bottom, >> 433 bootstrap_stack_bottom >> 434 + bootstrap_stack_size)) 420 sos_bochs_printf("Could not setup the Kern 435 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 421 436 422 if (sos_kmalloc_setup()) !! 437 if (sos_kmalloc_subsystem_setup()) 423 sos_bochs_printf("Could not setup the Kmal 438 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 424 439 425 /* Run some kmalloc tests */ !! 440 /* 426 bn_test(); !! 441 * Initialize the MMU context subsystem >> 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 interrupt handler >> 452 */ >> 453 sos_swintr_subsystem_setup(); >> 454 >> 455 >> 456 /* >> 457 * Initialize the Kernel thread and scheduler subsystems >> 458 */ >> 459 >> 460 /* Initialize kernel thread subsystem */ >> 461 sos_thread_subsystem_setup(bootstrap_stack_bottom, >> 462 bootstrap_stack_size); >> 463 >> 464 /* Initialize the scheduler */ >> 465 sos_sched_subsystem_setup(); >> 466 >> 467 /* Declare the IDLE thread */ >> 468 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, >> 469 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 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("stat_thread", stat_thread, >> 476 NULL, >> 477 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 478 >> 479 >> 480 /* >> 481 * Initialize process stuff >> 482 */ >> 483 sos_process_subsystem_setup(); 427 484 428 /* An operatig system never ends */ << 429 for (;;) << 430 continue; << 431 485 432 return; !! 486 /* Enabling the HW interrupts here, this will make the timer HW >> 487 interrupt call the scheduler */ >> 488 asm volatile ("sti\n"); >> 489 >> 490 /* Run some tests involving USER processes and threads */ >> 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, 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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