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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> 030 #include <sos/kmem_vmm.h> 029 #include <sos/kmem_vmm.h> 031 #include <sos/kmalloc.h> 030 #include <sos/kmalloc.h> >> 031 #include <sos/time.h> >> 032 #include <sos/thread.h> 032 #include <sos/klibc.h> 033 #include <sos/klibc.h> 033 #include <sos/assert.h> 034 #include <sos/assert.h> 034 #include <drivers/x86_videomem.h> 035 #include <drivers/x86_videomem.h> 035 #include <drivers/bochs.h> 036 #include <drivers/bochs.h> 036 037 037 038 038 /* Helper function to display each bits of a 3 039 /* Helper function to display each bits of a 32bits integer on the 039 screen as dark or light carrets */ 040 screen as dark or light carrets */ 040 static void display_bits(unsigned char row, un !! 041 void display_bits(unsigned char row, unsigned char col, 041 unsigned char attribu !! 042 unsigned char attribute, 042 sos_ui32_t integer) !! 043 sos_ui32_t integer) 043 { 044 { 044 int i; 045 int i; 045 /* Scan each bit of the integer, MSb first * 046 /* Scan each bit of the integer, MSb first */ 046 for (i = 31 ; i >= 0 ; i--) 047 for (i = 31 ; i >= 0 ; i--) 047 { 048 { 048 /* Test if bit i of 'integer' is set */ 049 /* Test if bit i of 'integer' is set */ 049 int bit_i = (integer & (1 << i)); 050 int bit_i = (integer & (1 << i)); 050 /* Ascii 219 => dark carret, Ascii 177 = 051 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 051 unsigned char ascii_code = bit_i?219:177 052 unsigned char ascii_code = bit_i?219:177; 052 sos_x86_videomem_putchar(row, col++, 053 sos_x86_videomem_putchar(row, col++, 053 attribute, 054 attribute, 054 ascii_code); 055 ascii_code); 055 } 056 } 056 } 057 } 057 058 058 059 059 /* Clock IRQ handler */ 060 /* Clock IRQ handler */ 060 static void clk_it(int intid) 061 static void clk_it(int intid) 061 { 062 { 062 static sos_ui32_t clock_count = 0; 063 static sos_ui32_t clock_count = 0; 063 064 064 display_bits(0, 48, 065 display_bits(0, 48, 065 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 066 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 066 clock_count); 067 clock_count); 067 clock_count++; 068 clock_count++; 068 069 >> 070 /* Execute the expired timeout actions (if any) */ >> 071 sos_time_do_tick(); 069 } 072 } 070 struct digit << 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; << 080 073 081 074 082 /* Add a new digit after the LSD */ !! 075 /* ====================================================================== 083 void bn_push_lsd(big_number_t * bn, char value !! 076 * Page fault exception handling 084 { !! 077 */ 085 struct digit *d; !! 078 086 d = (struct digit*) sos_kmalloc(sizeof(struc !! 079 /* Helper function to dump a backtrace on bochs and/or the console */ 087 SOS_ASSERT_FATAL(d != NULL); !! 080 static void dump_backtrace(const struct sos_cpu_state *cpu_state, 088 d->value = value; !! 081 sos_vaddr_t stack_bottom, 089 list_add_tail(*bn, d); !! 082 sos_size_t stack_size, 090 } !! 083 sos_bool_t on_console, >> 084 sos_bool_t on_bochs) >> 085 { >> 086 static void backtracer(sos_vaddr_t PC, >> 087 sos_vaddr_t params, >> 088 sos_ui32_t depth, >> 089 void *custom_arg) >> 090 { >> 091 sos_ui32_t invalid = 0xffffffff, *arg1, *arg2, *arg3, *arg4; >> 092 >> 093 /* Get the address of the first 3 arguments from the >> 094 frame. Among these arguments, 0, 1, 2, 3 arguments might be >> 095 meaningful (depending on how many arguments the function may >> 096 take). */ >> 097 arg1 = (sos_ui32_t*)params; >> 098 arg2 = (sos_ui32_t*)(params+4); >> 099 arg3 = (sos_ui32_t*)(params+8); >> 100 arg4 = (sos_ui32_t*)(params+12); >> 101 >> 102 /* Make sure the addresses of these arguments fit inside the >> 103 stack boundaries */ >> 104 #define INTERVAL_OK(b,v,u) ( ((b) <= (sos_vaddr_t)(v)) \ >> 105 && ((sos_vaddr_t)(v) < (u)) ) >> 106 if (!INTERVAL_OK(stack_bottom, arg1, stack_bottom + stack_size)) >> 107 arg1 = &invalid; >> 108 if (!INTERVAL_OK(stack_bottom, arg2, stack_bottom + stack_size)) >> 109 arg2 = &invalid; >> 110 if (!INTERVAL_OK(stack_bottom, arg3, stack_bottom + stack_size)) >> 111 arg3 = &invalid; >> 112 if (!INTERVAL_OK(stack_bottom, arg4, stack_bottom + stack_size)) >> 113 arg4 = &invalid; >> 114 >> 115 /* Print the function context for this frame */ >> 116 if (on_bochs) >> 117 sos_bochs_printf("[%d] PC=0x%x arg1=0x%x arg2=0x%x arg3=0x%x\n", >> 118 (unsigned)depth, (unsigned)PC, >> 119 (unsigned)*arg1, (unsigned)*arg2, >> 120 (unsigned)*arg3); >> 121 >> 122 if (on_console) >> 123 sos_x86_videomem_printf(23-depth, 3, >> 124 SOS_X86_VIDEO_BG_BLUE >> 125 | SOS_X86_VIDEO_FG_LTGREEN, >> 126 "[%d] PC=0x%x arg1=0x%x arg2=0x%x arg3=0x%x arg4=0x%x", >> 127 (unsigned)depth, PC, >> 128 (unsigned)*arg1, (unsigned)*arg2, >> 129 (unsigned)*arg3, (unsigned)*arg4); >> 130 >> 131 } >> 132 >> 133 sos_backtrace(cpu_state, 15, stack_bottom, stack_size, backtracer, NULL); >> 134 } >> 135 >> 136 >> 137 /* Page fault exception handler with demand paging for the kernel */ >> 138 static void pgflt_ex(int intid, const struct sos_cpu_state *ctxt) >> 139 { >> 140 static sos_ui32_t demand_paging_count = 0; >> 141 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); >> 142 sos_paddr_t ppage_paddr; >> 143 >> 144 /* Check if address is covered by any VMM range */ >> 145 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) >> 146 { >> 147 /* No: The page fault is out of any kernel virtual region. For >> 148 the moment, we don't handle this. */ >> 149 dump_backtrace(ctxt, >> 150 bootstrap_stack_bottom, >> 151 bootstrap_stack_size, >> 152 TRUE, TRUE); >> 153 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", >> 154 sos_cpu_context_get_PC(ctxt), >> 155 (unsigned)faulting_vaddr, >> 156 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 157 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); >> 158 } 091 159 092 160 093 /* Add a new digit before the MSD */ !! 161 /* 094 void bn_push_msd(big_number_t * bn, char value !! 162 * Demand paging 095 { !! 163 */ 096 struct digit *d; !! 164 097 d = (struct digit*) sos_kmalloc(sizeof(struc !! 165 /* Update the number of demand paging requests handled */ 098 SOS_ASSERT_FATAL(d != NULL); !! 166 demand_paging_count ++; 099 d->value = value; !! 167 display_bits(0, 0, 100 list_add_head(*bn, d); !! 168 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, >> 169 demand_paging_count); >> 170 >> 171 /* Allocate a new page for the virtual address */ >> 172 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); >> 173 if (! ppage_paddr) >> 174 SOS_ASSERT_FATAL(! "TODO: implement swap. (Out of mem in demand paging because no swap for kernel yet !)"); >> 175 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, >> 176 SOS_PAGE_ALIGN_INF(faulting_vaddr), >> 177 FALSE, >> 178 SOS_VM_MAP_PROT_READ >> 179 | SOS_VM_MAP_PROT_WRITE >> 180 | SOS_VM_MAP_ATOMIC)); >> 181 sos_physmem_unref_physpage(ppage_paddr); >> 182 >> 183 /* Ok, we can now return to interrupted context */ 101 } 184 } 102 185 103 186 104 /* Construct a big integer from a (machine) in !! 187 /* ====================================================================== 105 big_number_t bn_new(unsigned long int i) !! 188 * Demonstrate the use of SOS kernel threads 106 { !! 189 * - Kernel Threads are created with various priorities and their 107 big_number_t retval; !! 190 * state is printed on both the console and the bochs' 0xe9 port 108 !! 191 * - For tests regarding threads' synchronization, see mouse_sim.c 109 list_init(retval); !! 192 */ 110 do << 111 { << 112 bn_push_msd(&retval, i%10); << 113 i /= 10; << 114 } << 115 while (i != 0); << 116 << 117 return retval; << 118 } << 119 << 120 193 121 /* Create a new big integer from another big i !! 194 struct thr_arg 122 big_number_t bn_copy(const big_number_t bn) << 123 { 195 { 124 big_number_t retval; !! 196 char character; 125 int nb_elts; !! 197 int color; 126 struct digit *d; << 127 198 128 list_init(retval); !! 199 int col; 129 list_foreach(bn, d, nb_elts) !! 200 int row; 130 { !! 201 }; 131 bn_push_lsd(&retval, d->value); << 132 } << 133 << 134 return retval; << 135 } << 136 202 137 203 138 /* Free the memory used by a big integer */ !! 204 static void demo_thread(void *arg) 139 void bn_del(big_number_t * bn) << 140 { 205 { 141 struct digit *d; !! 206 struct thr_arg *thr_arg = (struct thr_arg*)arg; >> 207 int progress = 0; 142 208 143 list_collapse(*bn, d) !! 209 sos_bochs_printf("start %c", thr_arg->character); >> 210 while (1) 144 { 211 { 145 sos_kfree((sos_vaddr_t)d); !! 212 progress ++; 146 } !! 213 display_bits(thr_arg->row, thr_arg->col+1, thr_arg->color, progress); 147 } << 148 << 149 214 150 /* Shift left a big integer: bn := bn*10^shift !! 215 sos_bochs_putchar(thr_arg->character); 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 } << 158 216 >> 217 /* Yield the CPU to another thread sometimes... */ >> 218 if ((random() % 100) == 0) >> 219 { >> 220 sos_bochs_printf("[37myield(%c)[m\n", thr_arg->character); >> 221 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'Y'); >> 222 SOS_ASSERT_FATAL(SOS_OK == sos_thread_yield()); >> 223 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); >> 224 } 159 225 160 /* Dump the big integer in bochs */ !! 226 /* Go to sleep some other times... */ 161 void bn_print_bochs(const big_number_t bn) !! 227 else if ((random() % 200) == 0) 162 { !! 228 { 163 int nb_elts; !! 229 struct sos_time t = (struct sos_time){ .sec=0, .nanosec=50000000 }; 164 const struct digit *d; !! 230 sos_bochs_printf("[37msleep1(%c)[m\n", thr_arg->character); 165 !! 231 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 's'); 166 if (list_is_empty(bn)) !! 232 SOS_ASSERT_FATAL(SOS_OK == sos_thread_sleep(& t)); 167 sos_bochs_printf("0"); !! 233 SOS_ASSERT_FATAL(sos_time_is_zero(& t)); 168 else !! 234 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); 169 list_foreach(bn, d, nb_elts) !! 235 } 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; << 186 236 187 list_foreach(bn, d, nb_elts) !! 237 /* Go to sleep for a longer time some other times... */ >> 238 else if ((random() % 300) == 0) 188 { 239 { 189 if (nb_elts == 0) !! 240 struct sos_time t = (struct sos_time){ .sec=0, .nanosec=300000000 }; 190 { !! 241 sos_bochs_printf("[37msleep2(%c)[m\n", thr_arg->character); 191 sos_x86_videomem_printf(row, x, !! 242 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'S'); 192 x += 2; !! 243 SOS_ASSERT_FATAL(SOS_OK == sos_thread_sleep(& t)); 193 } !! 244 SOS_ASSERT_FATAL(sos_time_is_zero(& t)); 194 else if (nb_elts < nb_decimals) !! 245 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); 195 { << 196 sos_x86_videomem_printf(row, x, << 197 x ++; << 198 } << 199 } 246 } 200 247 201 sos_x86_videomem_printf(row, x, attribut !! 248 /* Infinite loop otherwise */ 202 } 249 } 203 } 250 } 204 251 205 252 206 /* Result is the addition of 2 big integers */ !! 253 static void test_thread() 207 big_number_t bn_add (const big_number_t bn1, c << 208 { 254 { 209 big_number_t retval; !! 255 /* "static" variables because we want them to remain even when the 210 const struct digit *d1, *d2; !! 256 function returns */ 211 sos_bool_t bn1_end = FALSE, bn2_end = FALSE !! 257 static struct thr_arg arg_b, arg_c, arg_d, arg_e, arg_R, arg_S; 212 char carry = 0; !! 258 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); << 239 259 240 if (carry > 0) !! 260 sos_disable_IRQs(flags); 241 { << 242 bn_push_msd(&retval, carry); << 243 } << 244 261 245 return retval; !! 262 arg_b = (struct thr_arg) { .character='b', .col=0, .row=21, .color=0x14 }; 246 } !! 263 sos_create_kernel_thread("YO[b]", demo_thread, (void*)&arg_b); 247 264 >> 265 arg_c = (struct thr_arg) { .character='c', .col=46, .row=21, .color=0x14 }; >> 266 sos_create_kernel_thread("YO[c]", demo_thread, (void*)&arg_c); 248 267 249 /* Result is the multiplication of a big integ !! 268 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 !! 269 sos_create_kernel_thread("YO[d]", demo_thread, (void*)&arg_d); 251 { << 252 big_number_t retval; << 253 int nb_elts; << 254 char carry = 0; << 255 const struct digit *d; << 256 270 257 list_init(retval); !! 271 arg_e = (struct thr_arg) { .character='e', .col=0, .row=19, .color=0x14 }; 258 list_foreach_backward(bn, d, nb_elts) !! 272 sos_create_kernel_thread("YO[e]", demo_thread, (void*)&arg_e); 259 { << 260 carry += d->value * digit; << 261 bn_push_msd(&retval, carry % 10); << 262 carry /= 10; << 263 } << 264 273 265 if (carry > 0) !! 274 arg_R = (struct thr_arg) { .character='R', .col=0, .row=17, .color=0x1c }; 266 { !! 275 sos_create_kernel_thread("YO[R]", demo_thread, (void*)&arg_R); 267 bn_push_msd(&retval, carry); !! 276 268 } !! 277 arg_S = (struct thr_arg) { .character='S', .col=0, .row=16, .color=0x1c }; >> 278 sos_create_kernel_thread("YO[S]", demo_thread, (void*)&arg_S); 269 279 270 return retval; !! 280 sos_restore_IRQs(flags); 271 } 281 } 272 282 273 283 274 /* Result is the multiplication of 2 big integ !! 284 /* ====================================================================== 275 big_number_t bn_mult(const big_number_t bn1, c !! 285 * An operating system MUST always have a ready thread ! Otherwise: >> 286 * what would the CPU have to execute ?! >> 287 */ >> 288 static void idle_thread() 276 { 289 { 277 int shift = 0; !! 290 sos_ui32_t idle_twiddle = 0; 278 big_number_t retval; << 279 int nb_elts; << 280 struct digit *d; << 281 291 282 list_init(retval); !! 292 while (1) 283 list_foreach_backward(bn2, d, nb_elts) << 284 { 293 { 285 big_number_t retmult = bn_muli(bn1, d->v !! 294 /* Remove this instruction if you get an "Invalid opcode" CPU 286 big_number_t old_retval = retval; !! 295 exception (old 80386 CPU) */ 287 bn_shift(& retmult, shift); !! 296 asm("hlt\n"); 288 retval = bn_add(old_retval, retmult); << 289 bn_del(& retmult); << 290 bn_del(& old_retval); << 291 shift ++; << 292 } << 293 << 294 return retval; << 295 } << 296 297 297 !! 298 idle_twiddle ++; 298 /* Result is the factorial of an integer */ !! 299 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 299 big_number_t bn_fact(unsigned long int v) !! 300 idle_twiddle); 300 { !! 301 301 unsigned long int i; !! 302 /* Lend the CPU to some other thread */ 302 big_number_t retval = bn_new(1); !! 303 sos_thread_yield(); 303 for (i = 1 ; i <= v ; i++) << 304 { << 305 big_number_t I = bn_new(i); << 306 big_number_t tmp = bn_mult(retval, I); << 307 sos_x86_videomem_printf(4, 0, << 308 SOS_X86_VIDEO_BG << 309 "%d! = ", (int)i << 310 bn_print_console(4, 8, SOS_X86_VIDEO_BG_ << 311 tmp, 55); << 312 bn_del(& I); << 313 bn_del(& retval); << 314 retval = tmp; << 315 } 304 } 316 << 317 return retval; << 318 } 305 } 319 306 320 307 321 void bn_test() !! 308 /* ====================================================================== 322 { !! 309 * The C entry point of our operating system 323 big_number_t bn = bn_fact(1000); !! 310 */ 324 sos_bochs_printf("1000! = "); << 325 bn_print_bochs(bn); << 326 sos_bochs_printf("\n"); << 327 << 328 } << 329 << 330 << 331 /* The C entry point of our operating system * << 332 void sos_main(unsigned long magic, unsigned lo 311 void sos_main(unsigned long magic, unsigned long addr) 333 { 312 { 334 unsigned i; 313 unsigned i; 335 sos_paddr_t sos_kernel_core_base_paddr, sos_ 314 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; >> 315 struct sos_time tick_resolution; 336 316 337 /* Grub sends us a structure, called multibo 317 /* Grub sends us a structure, called multiboot_info_t with a lot of 338 precious informations about the system, s 318 precious informations about the system, see the multiboot 339 documentation for more information. */ 319 documentation for more information. */ 340 multiboot_info_t *mbi; 320 multiboot_info_t *mbi; 341 mbi = (multiboot_info_t *) addr; 321 mbi = (multiboot_info_t *) addr; 342 322 343 /* Setup bochs and console, and clear the co 323 /* Setup bochs and console, and clear the console */ 344 sos_bochs_setup(); 324 sos_bochs_setup(); 345 325 346 sos_x86_videomem_setup(); 326 sos_x86_videomem_setup(); 347 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 327 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 348 328 349 /* Greetings from SOS */ 329 /* Greetings from SOS */ 350 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 330 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 351 /* Loaded with Grub */ 331 /* Loaded with Grub */ 352 sos_x86_videomem_printf(1, 0, 332 sos_x86_videomem_printf(1, 0, 353 SOS_X86_VIDEO_FG_Y 333 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 354 "Welcome From GRUB 334 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 355 "SOS", ',', !! 335 "SOS article 6.5", ',', 356 (unsigned)(mbi->me 336 (unsigned)(mbi->mem_upper >> 10) + 1, 357 (unsigned)mbi->mem 337 (unsigned)mbi->mem_upper); 358 else 338 else 359 /* Not loaded with grub */ 339 /* Not loaded with grub */ 360 sos_x86_videomem_printf(1, 0, 340 sos_x86_videomem_printf(1, 0, 361 SOS_X86_VIDEO_FG_Y 341 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 362 "Welcome to SOS"); !! 342 "Welcome to SOS article 6.5"); 363 343 364 sos_bochs_putstring("Message in a bochs\n"); !! 344 sos_bochs_putstring("Message in a bochs: This is SOS article 6.5.\n"); 365 345 366 /* Setup CPU segmentation and IRQ subsystem 346 /* Setup CPU segmentation and IRQ subsystem */ 367 sos_gdt_setup(); !! 347 sos_gdt_subsystem_setup(); 368 sos_idt_setup(); !! 348 sos_idt_subsystem_setup(); 369 349 370 /* Setup SOS IRQs and exceptions subsystem * 350 /* Setup SOS IRQs and exceptions subsystem */ 371 sos_exceptions_setup(); !! 351 sos_exception_subsystem_setup(); 372 sos_irq_setup(); !! 352 sos_irq_subsystem_setup(); 373 353 374 /* Configure the timer so as to raise the IR 354 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 375 sos_i8254_set_frequency(100); 355 sos_i8254_set_frequency(100); 376 356 >> 357 /* Setup the kernel time subsystem to get prepared to take the timer >> 358 ticks into account */ >> 359 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; >> 360 sos_time_subsysem_setup(& tick_resolution); 377 361 378 /* We need a multiboot-compliant boot loader 362 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 379 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 363 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 380 { 364 { 381 sos_x86_videomem_putstring(20, 0, 365 sos_x86_videomem_putstring(20, 0, 382 SOS_X86_VIDEO 366 SOS_X86_VIDEO_FG_LTRED 383 | SOS_X86_V 367 | SOS_X86_VIDEO_BG_BLUE 384 | SOS_X86_V 368 | SOS_X86_VIDEO_FG_BLINKING, 385 "I'm not load 369 "I'm not loaded with Grub !"); 386 /* STOP ! */ 370 /* STOP ! */ 387 for (;;) 371 for (;;) 388 continue; 372 continue; 389 } 373 } 390 374 >> 375 /* >> 376 * Some interrupt handlers >> 377 */ >> 378 391 /* Binding some HW interrupts and exceptions 379 /* Binding some HW interrupts and exceptions to software routines */ 392 sos_irq_set_routine(SOS_IRQ_TIMER, 380 sos_irq_set_routine(SOS_IRQ_TIMER, 393 clk_it); !! 381 clk_it); 394 /* Enabling the HW interrupts here, this wil !! 382 395 interrupt call our clk_it handler */ !! 383 /* 396 asm volatile ("sti\n"); !! 384 * Setup physical memory management >> 385 */ >> 386 397 /* Multiboot says: "The value returned for u 387 /* Multiboot says: "The value returned for upper memory is maximally 398 the address of the first upper memory hol 388 the address of the first upper memory hole minus 1 megabyte.". It 399 also adds: "It is not guaranteed to be th 389 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 400 sos_physmem_setup((mbi->mem_upper<<10) + (1< !! 390 sos_physmem_subsystem_setup((mbi->mem_upper<<10) + (1<<20), 401 & sos_kernel_core_base_pad !! 391 & sos_kernel_core_base_paddr, 402 & sos_kernel_core_top_padd !! 392 & sos_kernel_core_top_paddr); 403 393 404 /* 394 /* 405 * Switch to paged-memory mode 395 * Switch to paged-memory mode 406 */ 396 */ 407 397 408 /* Disabling interrupts should seem more cor 398 /* Disabling interrupts should seem more correct, but it's not really 409 necessary at this stage */ 399 necessary at this stage */ 410 if (sos_paging_setup(sos_kernel_core_base_pa !! 400 SOS_ASSERT_FATAL(SOS_OK == 411 sos_kernel_core_top_pad !! 401 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 412 sos_bochs_printf("Could not setup paged me !! 402 sos_kernel_core_top_paddr)); 413 sos_x86_videomem_printf(2, 0, !! 403 414 SOS_X86_VIDEO_FG_YEL !! 404 /* Bind the page fault exception */ 415 "Paged-memory mode i !! 405 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, >> 406 pgflt_ex); 416 407 >> 408 /* >> 409 * Setup kernel virtual memory allocator >> 410 */ 417 411 418 if (sos_kmem_vmm_setup(sos_kernel_core_base_ !! 412 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 419 sos_kernel_core_top_p !! 413 sos_kernel_core_top_paddr, >> 414 bootstrap_stack_bottom, >> 415 bootstrap_stack_bottom >> 416 + bootstrap_stack_size)) 420 sos_bochs_printf("Could not setup the Kern 417 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 421 418 422 if (sos_kmalloc_setup()) !! 419 if (sos_kmalloc_subsystem_setup()) 423 sos_bochs_printf("Could not setup the Kmal 420 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 424 421 425 /* Run some kmalloc tests */ !! 422 /* 426 bn_test(); !! 423 * Initialize the Kernel thread and scheduler subsystems >> 424 */ >> 425 >> 426 /* Initialize kernel thread subsystem */ >> 427 sos_thread_subsystem_setup(bootstrap_stack_bottom, >> 428 bootstrap_stack_size); >> 429 >> 430 /* Initialize the scheduler */ >> 431 sos_sched_subsystem_setup(); >> 432 >> 433 /* Declare the IDLE thread */ >> 434 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL) != NULL); >> 435 >> 436 /* Enabling the HW interrupts here, this will make the timer HW >> 437 interrupt call the scheduler */ >> 438 asm volatile ("sti\n"); >> 439 427 440 428 /* An operatig system never ends */ !! 441 /* Now run some Kernel threads just for fun ! */ 429 for (;;) !! 442 extern void MouseSim(); 430 continue; !! 443 MouseSim(); >> 444 test_thread(); 431 445 432 return; !! 446 /* >> 447 * We can safely exit from this function now, for there is already >> 448 * an idle Kernel thread ready to make the CPU busy working... >> 449 * >> 450 * However, we must EXPLICITELY call sos_thread_exit() because a >> 451 * simple "return" will return nowhere ! Actually this first thread >> 452 * was initialized by the Grub bootstrap stage, at a time when the >> 453 * word "thread" did not exist. This means that the stack was not >> 454 * setup in order for a return here to call sos_thread_exit() >> 455 * automagically. Hence we must call it manually. This is the ONLY >> 456 * kernel thread where we must do this manually. >> 457 */ >> 458 sos_bochs_printf("Bye from primary thread !\n"); >> 459 sos_thread_exit(); >> 460 SOS_FATAL_ERROR("No trespassing !"); 433 } 461 }
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