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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 void display_bits(unsigned char row, unsigned 049 void display_bits(unsigned char row, unsigned char col, 041 unsigned char attribute, 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 const struct sos_cpu_kstate << 062 { 070 { 063 static sos_ui32_t clock_count = 0; 071 static sos_ui32_t clock_count = 0; 064 072 065 display_bits(0, 48, 073 display_bits(0, 48, 066 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 074 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 067 clock_count); 075 clock_count); 068 clock_count++; 076 clock_count++; >> 077 >> 078 /* Execute the expired timeout actions (if any) */ >> 079 sos_time_do_tick(); >> 080 >> 081 /* Update scheduler statistics and status */ >> 082 sos_sched_do_timer_tick(); 069 } 083 } 070 084 071 085 072 /* =========================================== 086 /* ====================================================================== 073 * Page fault exception handling 087 * Page fault exception handling 074 */ 088 */ 075 089 076 /* Helper function to dump a backtrace on boch << 077 static void dump_backtrace(const struct sos_cp << 078 sos_vaddr_t stack_b << 079 sos_size_t stack_s << 080 sos_bool_t on_conso << 081 sos_bool_t on_bochs << 082 { << 083 static void backtracer(sos_vaddr_t PC, << 084 sos_vaddr_t params, << 085 sos_ui32_t depth, << 086 void *custom_arg) << 087 { << 088 sos_ui32_t invalid = 0xffffffff, *arg1, << 089 << 090 /* Get the address of the first 3 argume << 091 frame. Among these arguments, 0, 1, 2 << 092 meaningful (depending on how many arg << 093 take). */ << 094 arg1 = (sos_ui32_t*)params; << 095 arg2 = (sos_ui32_t*)(params+4); << 096 arg3 = (sos_ui32_t*)(params+8); << 097 arg4 = (sos_ui32_t*)(params+12); << 098 << 099 /* Make sure the addresses of these argu << 100 stack boundaries */ << 101 #define INTERVAL_OK(b,v,u) ( ((b) <= (sos_vadd << 102 && ((sos_vaddr_t) << 103 if (!INTERVAL_OK(stack_bottom, arg1, sta << 104 arg1 = &invalid; << 105 if (!INTERVAL_OK(stack_bottom, arg2, sta << 106 arg2 = &invalid; << 107 if (!INTERVAL_OK(stack_bottom, arg3, sta << 108 arg3 = &invalid; << 109 if (!INTERVAL_OK(stack_bottom, arg4, sta << 110 arg4 = &invalid; << 111 << 112 /* Print the function context for this f << 113 if (on_bochs) << 114 sos_bochs_printf("[%d] PC=0x%x arg1=0x << 115 (unsigned)depth, (uns << 116 (unsigned)*arg1, (uns << 117 (unsigned)*arg3); << 118 << 119 if (on_console) << 120 sos_x86_videomem_printf(23-depth, 3, << 121 SOS_X86_VIDEO_ << 122 | SOS_X86_VI << 123 "[%d] PC=0x%x << 124 (unsigned)dept << 125 (unsigned)*arg << 126 (unsigned)*arg << 127 << 128 } << 129 << 130 sos_backtrace(cpu_kstate, 15, stack_bottom, << 131 } << 132 << 133 090 134 /* Page fault exception handler with demand pa 091 /* Page fault exception handler with demand paging for the kernel */ 135 static void pgflt_ex(int intid, const struct s !! 092 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 136 { 093 { 137 static sos_ui32_t demand_paging_count = 0; 094 static sos_ui32_t demand_paging_count = 0; 138 sos_vaddr_t faulting_vaddr = sos_cpu_kstate_ !! 095 struct sos_thread * cur_thr = sos_thread_get_current(); >> 096 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 139 sos_paddr_t ppage_paddr; 097 sos_paddr_t ppage_paddr; 140 098 >> 099 if (sos_cpu_context_is_in_user_mode(ctxt) >> 100 || (cur_thr->fixup_uaccess.return_vaddr)) >> 101 { >> 102 __label__ unforce_address_space; >> 103 sos_bool_t need_to_setup_mmu; >> 104 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); >> 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); >> 112 >> 113 if (SOS_OK == >> 114 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, >> 115 errcode & (1 << 1), >> 116 TRUE)) >> 117 goto unforce_address_space; >> 118 >> 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)) >> 122 { >> 123 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; >> 124 sos_cpu_context_set_EX_return_address(ctxt, >> 125 cur_thr->fixup_uaccess.return_vaddr); >> 126 goto unforce_address_space; >> 127 } >> 128 >> 129 if (need_to_setup_mmu) >> 130 sos_thread_end_user_space_access(); >> 131 >> 132 sos_bochs_printf("Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\n", >> 133 sos_cpu_context_get_PC(ctxt), >> 134 (unsigned)faulting_vaddr, >> 135 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 136 sos_bochs_printf("Terminating User thread\n"); >> 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 } >> 144 141 /* Check if address is covered by any VMM ra 145 /* Check if address is covered by any VMM range */ 142 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 146 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 143 { 147 { 144 /* No: The page fault is out of any kern 148 /* No: The page fault is out of any kernel virtual region. For 145 the moment, we don't handle this. */ 149 the moment, we don't handle this. */ 146 dump_backtrace(ctxt, !! 150 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", 147 bootstrap_stack_bottom, !! 151 sos_cpu_context_get_PC(ctxt), 148 bootstrap_stack_size, << 149 TRUE, TRUE); << 150 sos_display_fatal_error("Unresolved page << 151 (unsigned)faulti 152 (unsigned)faulting_vaddr, 152 (unsigned)sos_cp !! 153 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 153 SOS_ASSERT_FATAL(! "Got page fault (note 154 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 154 } 155 } 155 156 156 157 157 /* 158 /* 158 * Demand paging !! 159 * Demand paging in kernel space 159 */ 160 */ 160 161 161 /* Update the number of demand paging reques 162 /* Update the number of demand paging requests handled */ 162 demand_paging_count ++; 163 demand_paging_count ++; 163 display_bits(0, 0, 164 display_bits(0, 0, 164 SOS_X86_VIDEO_FG_LTRED | SOS_X8 165 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 165 demand_paging_count); 166 demand_paging_count); 166 167 167 /* Allocate a new page for the virtual addre 168 /* Allocate a new page for the virtual address */ 168 ppage_paddr = sos_physmem_ref_physpage_new(F 169 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 169 if (! ppage_paddr) 170 if (! ppage_paddr) 170 SOS_ASSERT_FATAL(! "TODO: implement swap. 171 SOS_ASSERT_FATAL(! "TODO: implement swap. (Out of mem in demand paging because no swap for kernel yet !)"); 171 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 172 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 172 SO 173 SOS_PAGE_ALIGN_INF(faulting_vaddr), 173 FA 174 FALSE, 174 SO 175 SOS_VM_MAP_PROT_READ 175 | 176 | SOS_VM_MAP_PROT_WRITE 176 | 177 | SOS_VM_MAP_ATOMIC)); 177 sos_physmem_unref_physpage(ppage_paddr); 178 sos_physmem_unref_physpage(ppage_paddr); 178 179 179 /* Ok, we can now return to interrupted cont 180 /* Ok, we can now return to interrupted context */ 180 } 181 } 181 182 182 183 183 184 184 /* =========================================== 185 /* ====================================================================== 185 * Demonstrate the use of the CPU kernet conte !! 186 * An operating system MUST always have a ready thread ! Otherwise: 186 * - A coroutine prints "Hlowrd" and switches !! 187 * what would the CPU have to execute ?! 187 * letter << 188 * - A coroutine prints "el ol\n" and switche << 189 * each letter. << 190 * The first to reach the '\n' returns back to << 191 */ 188 */ 192 struct sos_cpu_kstate *ctxt_hello1; !! 189 static void idle_thread() 193 struct sos_cpu_kstate *ctxt_hello2; << 194 struct sos_cpu_kstate *ctxt_main; << 195 sos_vaddr_t hello1_stack, hello2_stack; << 196 << 197 static void reclaim_stack(sos_vaddr_t stack_va << 198 { 190 { 199 sos_kfree(stack_vaddr); !! 191 sos_ui32_t idle_twiddle = 0; 200 } << 201 << 202 << 203 static void exit_hello12(sos_vaddr_t stack_vad << 204 { << 205 sos_cpu_kstate_exit_to(ctxt_main, << 206 (sos_cpu_kstate_funct << 207 stack_vaddr); << 208 } << 209 << 210 << 211 static void hello1 (char *str) << 212 { << 213 for ( ; *str != '\n' ; str++) << 214 { << 215 sos_bochs_printf("hello1: %c\n", *str); << 216 sos_cpu_kstate_switch(& ctxt_hello1, ctx << 217 } << 218 << 219 /* You can uncomment this in case you explic << 220 now. But returning from the function will << 221 /* sos_cpu_kstate_exit_to(ctxt_main, << 222 (sos_cpu_kstate_funct << 223 hello1_stack); */ << 224 } << 225 << 226 192 227 static void hello2 (char *str) !! 193 while (1) 228 { << 229 for ( ; *str != '\n' ; str++) << 230 { 194 { 231 sos_bochs_printf("hello2: %c\n", *str); !! 195 /* Remove this instruction if you get an "Invalid opcode" CPU 232 sos_cpu_kstate_switch(& ctxt_hello2, ctx !! 196 exception (old 80386 CPU) */ 233 } !! 197 asm("hlt\n"); 234 << 235 /* You can uncomment this in case you explic << 236 now. But returning from the function will << 237 /* sos_cpu_kstate_exit_to(ctxt_main, << 238 (sos_cpu_kstate_funct << 239 hello2_stack); */ << 240 } << 241 << 242 << 243 void print_hello_world () << 244 { << 245 #define DEMO_STACK_SIZE 1024 << 246 /* Allocate the stacks */ << 247 hello1_stack = sos_kmalloc(DEMO_STACK_SIZE, << 248 hello2_stack = sos_kmalloc(DEMO_STACK_SIZE, << 249 << 250 /* Initialize the coroutines' contexts */ << 251 sos_cpu_kstate_init(&ctxt_hello1, << 252 (sos_cpu_kstate_function << 253 (sos_ui32_t) "Hlowrd", << 254 (sos_vaddr_t) hello1_sta << 255 (sos_cpu_kstate_function << 256 (sos_ui32_t) hello1_stac << 257 sos_cpu_kstate_init(&ctxt_hello2, << 258 (sos_cpu_kstate_function << 259 (sos_ui32_t) "el ol\n", << 260 (sos_vaddr_t) hello2_sta << 261 (sos_cpu_kstate_function << 262 (sos_ui32_t) hello2_stac << 263 << 264 /* Go to first coroutine */ << 265 sos_bochs_printf("Printing Hello World\\n... << 266 sos_cpu_kstate_switch(& ctxt_main, ctxt_hell << 267 << 268 /* The first coroutine to reach the '\n' swi << 269 sos_bochs_printf("Back in main !\n"); << 270 } << 271 << 272 << 273 /* =========================================== << 274 * Generate page faults on an unmapped but all << 275 * region, which results in a series of physic << 276 * faulted pages. << 277 */ << 278 static void test_demand_paging(int nb_alloc_vp << 279 { << 280 int i; << 281 sos_vaddr_t base_vaddr; << 282 << 283 sos_x86_videomem_printf(10, 0, << 284 SOS_X86_VIDEO_BG_BLU << 285 "Demand paging test << 286 nb_alloc_vpages >> 8 << 287 << 288 /* Allocate virtual memory */ << 289 base_vaddr = sos_kmem_vmm_alloc(nb_alloc_vpa << 290 << 291 SOS_ASSERT_FATAL(base_vaddr != (sos_vaddr_t) << 292 sos_x86_videomem_printf(11, 0, << 293 SOS_X86_VIDEO_BG_BLU << 294 "Allocated virtual r << 295 base_vaddr, << 296 base_vaddr + nb_allo << 297 198 298 /* Now use part of it in physical memory */ !! 199 idle_twiddle ++; 299 for (i = 0 ; (i < nb_alloc_ppages) && (i < n !! 200 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 300 { !! 201 idle_twiddle); 301 /* Compute an address inside the range * !! 202 302 sos_ui32_t *value, j; !! 203 /* Lend the CPU to some other thread */ 303 sos_vaddr_t vaddr = base_vaddr; !! 204 sos_thread_yield(); 304 vaddr += (nb_alloc_vpages - (i + 1))*SOS << 305 vaddr += 2345; << 306 << 307 sos_x86_videomem_printf(12, 0, << 308 SOS_X86_VIDEO_BG << 309 "Writing %d at v << 310 i, vaddr); << 311 << 312 /* Write at this address */ << 313 value = (sos_ui32_t*)vaddr; << 314 *value = i; << 315 << 316 /* Yep ! A new page should normally have << 317 sos_x86_videomem_printf(13, 0, << 318 SOS_X86_VIDEO_BG << 319 "Value read at a << 320 vaddr, (unsigned << 321 } 205 } 322 << 323 SOS_ASSERT_FATAL(SOS_OK == sos_kmem_vmm_free << 324 /* Yep ! A new page should normally have bee << 325 sos_x86_videomem_printf(14, 0, << 326 SOS_X86_VIDEO_BG_BLU << 327 "Done (area un-alloc << 328 } 206 } 329 207 330 208 331 << 332 /* =========================================== 209 /* ====================================================================== 333 * Shows how the backtrace stuff works !! 210 * Kernel thread showing some CPU usage statistics on the console every 1s 334 */ 211 */ 335 !! 212 static void stat_thread() 336 /* Recursive function. Print the backtrace fro << 337 static void test_backtrace(int i, int magic, s << 338 sos_size_t stack_s << 339 { 213 { 340 if (i <= 0) !! 214 while (1) 341 { 215 { 342 /* The page fault exception handler will !! 216 sos_ui32_t flags; 343 this function, because address 0x42 i !! 217 sos_ui32_t load1, load5, load15; 344 *((char*)0x42) = 12; !! 218 char str1[11], str5[11], str15[11]; 345 !! 219 struct sos_time t; 346 /* More direct variant: */ !! 220 t.sec = 1; 347 /* dump_backtrace(NULL, stack_bottom, st !! 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); 348 } 265 } 349 else << 350 test_backtrace(i-1, magic, stack_bottom, s << 351 } 266 } 352 267 353 268 354 /* =========================================== 269 /* ====================================================================== 355 * Parsing of Mathematical expressions !! 270 * Start the "init" (userland) process 356 * << 357 * This is a recursive lexer/parser/evaluator << 358 * expressions. Supports both binary +/-* and << 359 * well as parentheses. << 360 * << 361 * Terminal tokens (Lexer): << 362 * - Number: positive integer number << 363 * - Variable: ascii name (regexp: [a-zA-Z]+) << 364 * - Operator: +*-/ << 365 * - Opening/closing parentheses << 366 * << 367 * Grammar (Parser): << 368 * Expression ::= Term E' << 369 * Expr_lr ::= + Term Expr_lr | - Term Exp << 370 * Term ::= Factor Term_lr << 371 * Term_lr ::= * Factor Term_lr | / Factor << 372 * Factor ::= - Factor | + Factor | Scala << 373 * Scalar ::= Number | Variable << 374 * << 375 * Note. This is the left-recursive equivalent << 376 * Expression ::= Expression + Term | Express << 377 * Term ::= Term * Factor | Term / Fact << 378 * factor ::= - Factor | + Factor | Scala << 379 * Scalar ::= Number | Variable << 380 * << 381 * The parsing is composed of a 3 stages pipel << 382 * - The reader: reads a string 1 character a << 383 * the control back to lexer after each cha << 384 * interest in using coroutines, because it << 385 * implicitely stored in the stack between << 386 * - The lexer: consumes the characters from << 387 * the terminal tokens, 1 token at a time, << 388 * to the parser after each token. This fun << 389 * in using coroutines, because its state ( << 390 * implicitely stored in the stack between << 391 * - The parser: consumes the tokens from the << 392 * syntax tree of the expression. There is << 393 * interest in defining a coroutine devoted << 394 * do use one for that because this allows << 395 * deeper stack. Actually, the parser is hi << 396 * the default 16kB stack of the sos_main() << 397 * enough. Here, we switch to a 64kB stack, << 398 * recursive functions. The Parser uses int << 399 * are defined and implemented as internal << 400 * just for the sake of clarity, and is abs << 401 * the algorithm: one can transfer these fu << 402 * function without restriction. << 403 * << 404 * The evaluator is another recursive function << 405 * parser's stack to evaluate the parsed expre << 406 * values for the variables present in the exp << 407 * parser function, this function defines and << 408 * which can be extracted from the main evalua << 409 * << 410 * All these functions support a kind of "exce << 411 * something goes wrong, control is transferre << 412 * sos_main() context, without unrolling the r << 413 * how exceptions basically work, but one shou << 414 * a reference exceptions implementation. Real << 415 * (such as that in the C++ language) call the << 416 * objects allocated on the stack during the " << 417 * upon exception handling, which complicates << 418 * don't have real Objects here (in the OOP se << 419 * destructors), so we don't have to complicat << 420 * << 421 * After this little coroutine demo, one shoul << 422 * a low-level manual direct manipulation of s << 423 * probably mess up the whole kernel to do wha << 424 * resources such as mutex/semaphore won't be << 425 * ...). Higher level "kernel thread" primitiv << 426 * presented, which provide a higher-level set << 427 * contexts. You'll have to use EXCLUSIVELY th << 428 * need a huge stack to do recursion for examp << 429 * think of changing manually the stack for so << 430 * rethink your algorithm, making it non-recur << 431 */ << 432 << 433 << 434 /* The stacks involved */ << 435 static char stack_reader[1024]; << 436 static char stack_lexer[1024]; << 437 static char deep_stack[65536]; /* For the pars << 438 << 439 /* The CPU states for the various coroutines * << 440 static struct sos_cpu_kstate *st_reader, *st_l << 441 *st_eval, *st_free, *st_main; << 442 << 443 << 444 /* << 445 * Default exit/reclaim functions: return cont << 446 * context << 447 */ 271 */ 448 static void reclaim(int unused) !! 272 static sos_ret_t start_init() 449 { << 450 } << 451 static void func_exit(sos_ui32_t unused) << 452 { << 453 sos_cpu_kstate_exit_to(st_main, (sos_cpu_kst << 454 } << 455 << 456 << 457 /* << 458 * The reader coroutine and associated variabl << 459 * have been a normal function, except that th << 460 * character would have to be stored somewhere << 461 */ << 462 static char data_reader_to_lexer; << 463 << 464 static void func_reader(const char *str) << 465 { << 466 for ( ; str && (*str != '\0') ; str++) << 467 { << 468 data_reader_to_lexer = *str; << 469 sos_cpu_kstate_switch(& st_reader, st_le << 470 } << 471 << 472 data_reader_to_lexer = '\0'; << 473 sos_cpu_kstate_switch(& st_reader, st_lexer) << 474 } << 475 << 476 << 477 /* << 478 * The Lexer coroutine and associated types/va << 479 * could have been a normal function, except t << 480 * character, token and previous token would h << 481 * somewhere. << 482 */ << 483 #define STR_VAR_MAXLEN 16 << 484 static struct lex_elem << 485 { << 486 enum { LEX_IS_NUMBER, LEX_IS_OPER, LEX_IS_VA << 487 LEX_IS_OPENPAR, LEX_IS_CLOSEPAR, LEX_ << 488 union { << 489 int number; << 490 char operator; << 491 char var[STR_VAR_MAXLEN]; << 492 }; << 493 } data_lexer_to_parser; << 494 << 495 static void func_lexer(sos_ui32_t unused) << 496 { 273 { 497 char c; !! 274 sos_ret_t retval; 498 enum { GOT_SPACE, GOT_NUM, GOT_OP, GOT_STR, !! 275 struct sos_umem_vmm_as *as_init; 499 GOT_OPENPAR, GOT_CLOSEPAR } got_what, !! 276 struct sos_process *proc_init; 500 !! 277 struct sos_thread *new_thr; 501 data_lexer_to_parser.number = 0; !! 278 sos_uaddr_t ustack, start_uaddr; 502 got_what_before = GOT_SPACE; !! 279 503 do !! 280 /* Create the new process */ 504 { !! 281 proc_init = sos_process_create("init", FALSE); 505 /* Consume one character from the reader !! 282 if (! proc_init) 506 sos_cpu_kstate_switch(& st_lexer, st_rea !! 283 return -SOS_ENOMEM; 507 c = data_reader_to_lexer; !! 284 as_init = sos_process_get_address_space(proc_init); 508 !! 285 509 /* Classify the consumed character */ !! 286 /* Map the 'init' program in user space */ 510 if ( (c >= '0') && (c <= '9') ) !! 287 start_uaddr = sos_binfmt_elf32_map(as_init, "init"); 511 got_what = GOT_NUM; !! 288 if (0 == start_uaddr) 512 else if ( (c == '+') || (c == '-') || (c !! 289 { 513 got_what = GOT_OP; !! 290 sos_process_unref(proc_init); 514 else if ( ( (c >= 'a') && (c <= 'z') ) !! 291 return -SOS_ENOENT; 515 || ( (c >= 'A') && (c <= 'Z') !! 292 } 516 got_what = GOT_STR; !! 293 517 else if (c == '(') !! 294 /* Allocate the user stack */ 518 got_what = GOT_OPENPAR; !! 295 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; 519 else if (c == ')') !! 296 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, 520 got_what = GOT_CLOSEPAR; !! 297 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, 521 else !! 298 /* PRIVATE */ 0); 522 got_what = GOT_SPACE; !! 299 if (SOS_OK != retval) 523 !! 300 { 524 /* Determine whether the current token i !! 301 sos_bochs_printf("ici 2\n"); 525 if ( (got_what != got_what_before) !! 302 sos_process_unref(proc_init); 526 || (got_what_before == GOT_OP) !! 303 return -SOS_ENOMEM; 527 || (got_what_before == GOT_OPENPAR) !! 304 } 528 || (got_what_before == GOT_CLOSEPAR !! 305 529 { !! 306 /* Now create the user thread */ 530 /* return control back to the parser !! 307 new_thr = sos_create_user_thread(NULL, 531 has been recognized */ !! 308 proc_init, 532 if ( (got_what_before != GOT_SPACE) !! 309 start_uaddr, 533 sos_cpu_kstate_switch(& st_lexer, !! 310 0, 0, 534 !! 311 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, 535 data_lexer_to_parser.number = 0; !! 312 SOS_SCHED_PRIO_TS_LOWEST); 536 } !! 313 if (! new_thr) 537 !! 314 { 538 /* Update the token being currently reco !! 315 sos_bochs_printf("ici 3\n"); 539 if (got_what == GOT_OP) !! 316 sos_process_unref(proc_init); 540 { !! 317 return -SOS_ENOMEM; 541 data_lexer_to_parser.type = LEX_IS_O << 542 data_lexer_to_parser.operator = c; << 543 } << 544 else if (got_what == GOT_NUM) << 545 { << 546 data_lexer_to_parser.type = LEX_IS_N << 547 data_lexer_to_parser.number *= 10; << 548 data_lexer_to_parser.number += (c - << 549 } << 550 else if (got_what == GOT_STR) << 551 { << 552 char to_cat[] = { c, '\0' }; << 553 data_lexer_to_parser.type = LEX_IS_V << 554 strzcat(data_lexer_to_parser.var, to << 555 } << 556 else if (got_what == GOT_OPENPAR) << 557 data_lexer_to_parser.type = LEX_IS_OPE << 558 else if (got_what == GOT_CLOSEPAR) << 559 data_lexer_to_parser.type = LEX_IS_CLO << 560 << 561 got_what_before = got_what; << 562 } 318 } 563 while (c != '\0'); << 564 319 565 /* Transfer last recognized token to the par !! 320 sos_process_unref(proc_init); 566 if ( (got_what_before != GOT_SPACE) ) !! 321 return SOS_OK; 567 sos_cpu_kstate_switch(& st_lexer, st_parse << 568 << 569 /* Signal that no more token are available * << 570 data_lexer_to_parser.type = LEX_END; << 571 sos_cpu_kstate_switch(& st_lexer, st_parser) << 572 << 573 /* Exception: parser asks for a token AFTER << 574 one */ << 575 sos_bochs_printf("Error: end of string alrea << 576 sos_cpu_kstate_switch(& st_lexer, st_main); << 577 } << 578 << 579 << 580 /* << 581 * The Parser coroutine and associated types/v << 582 */ << 583 struct syntax_node << 584 { << 585 enum { YY_IS_BINOP, YY_IS_UNAROP, YY_IS_NUM, << 586 union << 587 { << 588 int number; << 589 char var[STR_VAR_MAXLEN]; << 590 struct << 591 { << 592 char op; << 593 struct syntax_node *parm_left, *parm_rig << 594 } binop; << 595 struct << 596 { << 597 char op; << 598 struct syntax_node *parm; << 599 } unarop; << 600 }; << 601 }; << 602 << 603 static void func_parser(struct syntax_node ** << 604 { << 605 static struct syntax_node *alloc_node_num(in << 606 static struct syntax_node *alloc_node_var(co << 607 static struct syntax_node *alloc_node_binop( << 608 << 609 << 610 static struct syntax_node *alloc_node_unarop << 611 << 612 static struct syntax_node * get_expr(); << 613 static struct syntax_node * get_expr_lr(stru << 614 static struct syntax_node * get_term(); << 615 static struct syntax_node * get_term_lr(stru << 616 static struct syntax_node * get_factor(); << 617 static struct syntax_node * get_scalar(); << 618 << 619 /* Create a new node to store a number */ << 620 static struct syntax_node *alloc_node_num(in << 621 { << 622 struct syntax_node *n << 623 = (struct syntax_node*) sos_kmalloc(si << 624 n->type = YY_IS_NUM; << 625 n->number = val; << 626 return n; << 627 } << 628 /* Create a new node to store a variable */ << 629 static struct syntax_node *alloc_node_var(co << 630 { << 631 struct syntax_node *n << 632 = (struct syntax_node*) sos_kmalloc(si << 633 n->type = YY_IS_VAR; << 634 strzcpy(n->var, name, STR_VAR_MAXLEN); << 635 return n; << 636 } << 637 /* Create a new node to store a binary opera << 638 static struct syntax_node *alloc_node_binop( << 639 << 640 << 641 { << 642 struct syntax_node *n << 643 = (struct syntax_node*) sos_kmalloc(si << 644 n->type = YY_IS_BINOP; << 645 n->binop.op = op; << 646 n->binop.parm_left = parm_left; << 647 n->binop.parm_right = parm_right; << 648 return n; << 649 } << 650 /* Create a new node to store a unary operat << 651 static struct syntax_node *alloc_node_unarop << 652 << 653 { << 654 struct syntax_node *n << 655 = (struct syntax_node*) sos_kmalloc(si << 656 n->type = YY_IS_UNAROP; << 657 n->unarop.op = op; << 658 n->unarop.parm = parm; << 659 return n; << 660 } << 661 << 662 /* Raise an exception: transfer control back << 663 without unrolling the whole recursion */ << 664 static void parser_exception(const char *str << 665 { << 666 sos_bochs_printf("Parser exception: %s\n << 667 sos_cpu_kstate_switch(& st_parser, st_ma << 668 } << 669 << 670 /* Consume the current terminal "number" tok << 671 token */ << 672 static int get_number() << 673 { << 674 int v; << 675 if (data_lexer_to_parser.type != LEX_IS_ << 676 parser_exception("Expected number"); << 677 v = data_lexer_to_parser.number; << 678 sos_cpu_kstate_switch(& st_parser, st_le << 679 return v; << 680 } << 681 /* Consume the current terminal "variable" t << 682 token */ << 683 static void get_str(char name[STR_VAR_MAXLEN << 684 { << 685 if (data_lexer_to_parser.type != LEX_IS_ << 686 parser_exception("Expected variable"); << 687 strzcpy(name, data_lexer_to_parser.var, << 688 sos_cpu_kstate_switch(& st_parser, st_le << 689 } << 690 /* Consume the current terminal "operator" t << 691 token */ << 692 static char get_op() << 693 { << 694 char op; << 695 if (data_lexer_to_parser.type != LEX_IS_ << 696 parser_exception("Expected operator"); << 697 op = data_lexer_to_parser.operator; << 698 sos_cpu_kstate_switch(& st_parser, st_le << 699 return op; << 700 } << 701 /* Consume the current terminal "parenthese" << 702 token */ << 703 static void get_par() << 704 { << 705 if ( (data_lexer_to_parser.type != LEX_I << 706 && (data_lexer_to_parser.type != LE << 707 parser_exception("Expected parenthese" << 708 sos_cpu_kstate_switch(& st_parser, st_le << 709 } << 710 << 711 /* Parse an Expression */ << 712 static struct syntax_node * get_expr() << 713 { << 714 struct syntax_node *t = get_term(); << 715 return get_expr_lr(t); << 716 } << 717 /* Parse an Expr_lr */ << 718 static struct syntax_node * get_expr_lr(stru << 719 { << 720 if ( (data_lexer_to_parser.type == LEX_I << 721 && ( (data_lexer_to_parser.operator << 722 || (data_lexer_to_parser.opera << 723 { << 724 char op = get_op(); << 725 struct syntax_node *term = get_term( << 726 struct syntax_node *node_op = alloc_ << 727 return get_expr_lr(node_op); << 728 } << 729 return n; << 730 } << 731 /* Parse a Term */ << 732 static struct syntax_node * get_term() << 733 { << 734 struct syntax_node *f1 = get_factor(); << 735 return get_term_lr(f1); << 736 } << 737 /* Parse a Term_lr */ << 738 static struct syntax_node * get_term_lr(stru << 739 { << 740 if ( (data_lexer_to_parser.type == LEX_I << 741 && ( (data_lexer_to_parser.operator << 742 || (data_lexer_to_parser.opera << 743 { << 744 char op = get_op(); << 745 struct syntax_node *factor = get_fac << 746 struct syntax_node *node_op = alloc_ << 747 return get_term_lr(node_op); << 748 } << 749 return n; << 750 } << 751 /* Parse a Factor */ << 752 static struct syntax_node * get_factor() << 753 { << 754 if ( (data_lexer_to_parser.type == LEX_I << 755 && ( (data_lexer_to_parser.operator << 756 || (data_lexer_to_parser.opera << 757 { char op = data_lexer_to_parser.opera << 758 get_op(); return alloc_node_unarop(op, << 759 else if (data_lexer_to_parser.type == LE << 760 { << 761 struct syntax_node *expr; << 762 get_par(); << 763 expr = get_expr(); << 764 if (data_lexer_to_parser.type != LEX << 765 parser_exception("Mismatched paren << 766 get_par(); << 767 return expr; << 768 } << 769 << 770 return get_scalar(); << 771 } << 772 /* Parse a Scalar */ << 773 static struct syntax_node * get_scalar() << 774 { << 775 if (data_lexer_to_parser.type != LEX_IS_ << 776 { << 777 char var[STR_VAR_MAXLEN]; << 778 get_str(var); << 779 return alloc_node_var(var); << 780 } << 781 return alloc_node_num(get_number()); << 782 } << 783 << 784 << 785 /* << 786 * Body of the function << 787 */ << 788 << 789 /* Get the first token */ << 790 sos_cpu_kstate_switch(& st_parser, st_lexer) << 791 << 792 /* Begin the parsing ! */ << 793 *syntax_tree = get_expr(); << 794 /* The result is returned in the syntax_tree << 795 } << 796 << 797 << 798 /* << 799 * Setup the parser's pipeline << 800 */ << 801 static struct syntax_node * parse_expression(c << 802 { << 803 struct syntax_node *retval = NULL; << 804 << 805 /* Build the context of the functions in the << 806 sos_cpu_kstate_init(& st_reader, << 807 (sos_cpu_kstate_function << 808 (sos_ui32_t)expr, << 809 (sos_vaddr_t)stack_reade << 810 (sos_cpu_kstate_function << 811 sos_cpu_kstate_init(& st_lexer, << 812 (sos_cpu_kstate_function << 813 0, << 814 (sos_vaddr_t)stack_lexer << 815 (sos_cpu_kstate_function << 816 sos_cpu_kstate_init(& st_parser, << 817 (sos_cpu_kstate_function << 818 (sos_ui32_t) /* syntax t << 819 (sos_vaddr_t)deep_stack, << 820 (sos_cpu_kstate_function << 821 << 822 /* Parse the expression */ << 823 sos_cpu_kstate_switch(& st_main, st_parser); << 824 return retval; << 825 } << 826 << 827 << 828 /* << 829 * The Evaluator coroutine and associated type << 830 */ << 831 struct func_eval_params << 832 { << 833 const struct syntax_node *e; << 834 const char **var_name; << 835 int *var_val; << 836 int nb_vars; << 837 << 838 int result; << 839 }; << 840 << 841 static void func_eval(struct func_eval_params << 842 { << 843 /* The internal (recursive) nested function << 844 the syntax tree */ << 845 static int rec_eval(const struct syntax_node << 846 const char* var_name[], << 847 { << 848 switch (n->type) << 849 { << 850 case YY_IS_NUM: << 851 return n->number; << 852 << 853 case YY_IS_VAR: << 854 { << 855 int i; << 856 for (i = 0 ; i < nb_vars ; i++) << 857 if (0 == strcmp(var_name[i], n-> << 858 return var_val[i]; << 859 << 860 /* Exception: no variable with tha << 861 sos_bochs_printf("ERROR: unknown v << 862 sos_cpu_kstate_switch(& st_eval, s << 863 } << 864 << 865 case YY_IS_BINOP: << 866 { << 867 int left = rec_eval(n->binop.parm_ << 868 var_name, var_ << 869 int right = rec_eval(n->binop.parm << 870 var_name, var << 871 switch (n->binop.op) << 872 { << 873 case '+': return left + right; << 874 case '-': return left - right; << 875 case '*': return left * right; << 876 case '/': return left / right; << 877 default: << 878 /* Exception: no such operator << 879 sos_bochs_printf("ERROR: unkno << 880 sos_cpu_kstate_switch(& st_eva << 881 } << 882 } << 883 << 884 case YY_IS_UNAROP: << 885 { << 886 int arg = rec_eval(n->unarop.parm, << 887 switch (n->unarop.op) << 888 { << 889 case '-': return -arg; << 890 case '+': return arg; << 891 default: << 892 /* Exception: no such operator << 893 sos_bochs_printf("ERROR: unkno << 894 sos_cpu_kstate_switch(& st_eva << 895 } << 896 } << 897 } << 898 << 899 /* Exception: no such syntax node (INTER << 900 sos_bochs_printf("ERROR: invalid node ty << 901 sos_cpu_kstate_switch(& st_eval, st_main << 902 return -1; /* let's make gcc happy */ << 903 } << 904 << 905 << 906 /* << 907 * Function BODY << 908 */ << 909 /* Update p.result returned back to calling << 910 parms->result << 911 = rec_eval(parms->e, parms->var_name, parm << 912 } << 913 << 914 /* << 915 * Change the stack for something larger in or << 916 * recursive function above in a safe way << 917 */ << 918 static int eval_expression(const struct syntax << 919 const char* var_nam << 920 { << 921 struct func_eval_params p << 922 = (struct func_eval_params){ .e=e, << 923 .var_name=var << 924 .var_val=var_ << 925 .nb_vars=nb_v << 926 .result = 0 } << 927 << 928 sos_cpu_kstate_init(& st_eval, << 929 (sos_cpu_kstate_function << 930 (sos_ui32_t)/* p.result << 931 (sos_vaddr_t)deep_stack, << 932 (sos_cpu_kstate_function << 933 << 934 /* Go ! */ << 935 sos_cpu_kstate_switch(& st_main, st_eval); << 936 return p.result; << 937 } << 938 << 939 << 940 /* << 941 * Function to free the syntax tree << 942 */ << 943 static void func_free(struct syntax_node *n) << 944 { << 945 switch (n->type) << 946 { << 947 case YY_IS_NUM: << 948 case YY_IS_VAR: << 949 break; << 950 << 951 case YY_IS_BINOP: << 952 func_free(n->binop.parm_left); << 953 func_free(n->binop.parm_right); << 954 break; << 955 << 956 case YY_IS_UNAROP: << 957 func_free(n->unarop.parm); << 958 break; << 959 } << 960 << 961 sos_kfree((sos_vaddr_t)n); << 962 } << 963 << 964 /* << 965 * Change the stack for something larger in or << 966 * recursive function above in a safe way << 967 */ << 968 static void free_syntax_tree(struct syntax_nod << 969 { << 970 sos_cpu_kstate_init(& st_free, << 971 (sos_cpu_kstate_function << 972 (sos_ui32_t)tree, << 973 (sos_vaddr_t)deep_stack, << 974 (sos_cpu_kstate_function << 975 << 976 /* Go ! */ << 977 sos_cpu_kstate_switch(& st_main, st_free); << 978 } 322 } 979 323 980 324 981 /* =========================================== 325 /* ====================================================================== 982 * The C entry point of our operating system 326 * The C entry point of our operating system 983 */ 327 */ 984 void sos_main(unsigned long magic, unsigned lo 328 void sos_main(unsigned long magic, unsigned long addr) 985 { 329 { 986 unsigned i; 330 unsigned i; 987 sos_paddr_t sos_kernel_core_base_paddr, sos_ 331 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 988 struct syntax_node *syntax_tree; !! 332 struct sos_time tick_resolution; 989 333 990 /* Grub sends us a structure, called multibo 334 /* Grub sends us a structure, called multiboot_info_t with a lot of 991 precious informations about the system, s 335 precious informations about the system, see the multiboot 992 documentation for more information. */ 336 documentation for more information. */ 993 multiboot_info_t *mbi; 337 multiboot_info_t *mbi; 994 mbi = (multiboot_info_t *) addr; 338 mbi = (multiboot_info_t *) addr; 995 339 996 /* Setup bochs and console, and clear the co 340 /* Setup bochs and console, and clear the console */ 997 sos_bochs_setup(); 341 sos_bochs_setup(); 998 342 999 sos_x86_videomem_setup(); 343 sos_x86_videomem_setup(); 1000 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE) 344 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 1001 345 1002 /* Greetings from SOS */ 346 /* Greetings from SOS */ 1003 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 347 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 1004 /* Loaded with Grub */ 348 /* Loaded with Grub */ 1005 sos_x86_videomem_printf(1, 0, 349 sos_x86_videomem_printf(1, 0, 1006 SOS_X86_VIDEO_FG_ 350 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 1007 "Welcome From GRU 351 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 1008 "SOS", ',', !! 352 "SOS article 7.5", ',', 1009 (unsigned)(mbi->m 353 (unsigned)(mbi->mem_upper >> 10) + 1, 1010 (unsigned)mbi->me 354 (unsigned)mbi->mem_upper); 1011 else 355 else 1012 /* Not loaded with grub */ 356 /* Not loaded with grub */ 1013 sos_x86_videomem_printf(1, 0, 357 sos_x86_videomem_printf(1, 0, 1014 SOS_X86_VIDEO_FG_ 358 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 1015 "Welcome to SOS") !! 359 "Welcome to SOS article 7.5"); 1016 360 1017 sos_bochs_putstring("Message in a bochs\n") !! 361 sos_bochs_putstring("Message in a bochs: This is SOS article 7.5.\n"); 1018 362 1019 /* Setup CPU segmentation and IRQ subsystem 363 /* Setup CPU segmentation and IRQ subsystem */ 1020 sos_gdt_subsystem_setup(); 364 sos_gdt_subsystem_setup(); 1021 sos_idt_subsystem_setup(); 365 sos_idt_subsystem_setup(); 1022 366 1023 /* Setup SOS IRQs and exceptions subsystem 367 /* Setup SOS IRQs and exceptions subsystem */ 1024 sos_exception_subsystem_setup(); 368 sos_exception_subsystem_setup(); 1025 sos_irq_subsystem_setup(); 369 sos_irq_subsystem_setup(); 1026 370 1027 /* Configure the timer so as to raise the I 371 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 1028 sos_i8254_set_frequency(100); 372 sos_i8254_set_frequency(100); 1029 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); >> 378 1030 /* We need a multiboot-compliant boot loade 379 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 1031 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 380 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 1032 { 381 { 1033 sos_x86_videomem_putstring(20, 0, 382 sos_x86_videomem_putstring(20, 0, 1034 SOS_X86_VIDE 383 SOS_X86_VIDEO_FG_LTRED 1035 | SOS_X86_ 384 | SOS_X86_VIDEO_BG_BLUE 1036 | SOS_X86_ 385 | SOS_X86_VIDEO_FG_BLINKING, 1037 "I'm not loa 386 "I'm not loaded with Grub !"); 1038 /* STOP ! */ 387 /* STOP ! */ 1039 for (;;) 388 for (;;) 1040 continue; 389 continue; 1041 } 390 } 1042 391 1043 /* 392 /* 1044 * Some interrupt handlers 393 * Some interrupt handlers 1045 */ 394 */ 1046 395 1047 /* Binding some HW interrupts and exception 396 /* Binding some HW interrupts and exceptions to software routines */ 1048 sos_irq_set_routine(SOS_IRQ_TIMER, 397 sos_irq_set_routine(SOS_IRQ_TIMER, 1049 clk_it); 398 clk_it); 1050 399 1051 /* 400 /* 1052 * Setup physical memory management 401 * Setup physical memory management 1053 */ 402 */ 1054 403 1055 /* Multiboot says: "The value returned for 404 /* Multiboot says: "The value returned for upper memory is maximally 1056 the address of the first upper memory ho 405 the address of the first upper memory hole minus 1 megabyte.". It 1057 also adds: "It is not guaranteed to be t 406 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 1058 sos_physmem_subsystem_setup((mbi->mem_upper 407 sos_physmem_subsystem_setup((mbi->mem_upper<<10) + (1<<20), 1059 & sos_kernel_co 408 & sos_kernel_core_base_paddr, 1060 & sos_kernel_co 409 & sos_kernel_core_top_paddr); 1061 410 1062 /* 411 /* 1063 * Switch to paged-memory mode 412 * Switch to paged-memory mode 1064 */ 413 */ 1065 414 1066 /* Disabling interrupts should seem more co 415 /* Disabling interrupts should seem more correct, but it's not really 1067 necessary at this stage */ 416 necessary at this stage */ 1068 SOS_ASSERT_FATAL(SOS_OK == 417 SOS_ASSERT_FATAL(SOS_OK == 1069 sos_paging_subsystem_setup 418 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 1070 419 sos_kernel_core_top_paddr)); 1071 420 1072 /* Bind the page fault exception */ 421 /* Bind the page fault exception */ 1073 sos_exception_set_routine(SOS_EXCEPT_PAGE_F 422 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 1074 pgflt_ex); 423 pgflt_ex); 1075 424 1076 /* 425 /* 1077 * Setup kernel virtual memory allocator 426 * Setup kernel virtual memory allocator 1078 */ !! 427 */ 1079 428 1080 if (sos_kmem_vmm_subsystem_setup(sos_kernel 429 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 1081 sos_kernel 430 sos_kernel_core_top_paddr, 1082 bootstrap_ 431 bootstrap_stack_bottom, 1083 bootstrap_ 432 bootstrap_stack_bottom 1084 + bootstra 433 + bootstrap_stack_size)) 1085 sos_bochs_printf("Could not setup the Ker 434 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 1086 435 1087 if (sos_kmalloc_subsystem_setup()) 436 if (sos_kmalloc_subsystem_setup()) 1088 sos_bochs_printf("Could not setup the Kma 437 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 1089 438 1090 /* 439 /* 1091 * Enabling the HW interrupts here, this wi !! 440 * Initialize the MMU context subsystem 1092 * interrupt call our clk_it handler << 1093 */ 441 */ 1094 asm volatile ("sti\n"); !! 442 sos_mm_context_subsystem_setup(); 1095 443 1096 /* 444 /* 1097 * Print hello world using coroutines !! 445 * Initialize the CPU context subsystem 1098 */ 446 */ 1099 print_hello_world(); !! 447 sos_cpu_context_subsystem_setup(); 1100 << 1101 448 1102 /* 449 /* 1103 * Run coroutine tests !! 450 * Bind the syscall handler to its software interrupt handler 1104 */ 451 */ 1105 sos_x86_videomem_printf(4, 0, !! 452 sos_swintr_subsystem_setup(); 1106 SOS_X86_VIDEO_BG_BL << 1107 "Coroutine test"); << 1108 sos_x86_videomem_printf(5, 0, << 1109 SOS_X86_VIDEO_BG_BL << 1110 "Parsing..."); << 1111 syntax_tree = parse_expression(" - ( (69/ << 1112 453 1113 if (syntax_tree != NULL) << 1114 { << 1115 sos_x86_videomem_printf(6, 0, << 1116 SOS_X86_VIDEO_B << 1117 "Evaluating..." << 1118 sos_x86_videomem_printf(7, 0, << 1119 SOS_X86_VIDEO_B << 1120 "Result=%d (if << 1121 eval_expression << 1122 << 1123 << 1124 << 1125 free_syntax_tree(syntax_tree); << 1126 sos_x86_videomem_printf(8, 0, << 1127 SOS_X86_VIDEO_B << 1128 "Done (un-alloc << 1129 } << 1130 else << 1131 { << 1132 sos_x86_videomem_printf(6, 0, << 1133 SOS_X86_VIDEO_B << 1134 "Error in parsi << 1135 } << 1136 454 1137 /* 455 /* 1138 * Run some demand-paging tests !! 456 * Initialize the Kernel thread and scheduler subsystems 1139 */ 457 */ 1140 test_demand_paging(234567, 500); !! 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); 1141 477 1142 478 1143 /* 479 /* 1144 * Create an un-resolved page fault, which !! 480 * Initialise user address space management subsystem 1145 * handler print the backtrace. << 1146 */ 481 */ 1147 test_backtrace(6, 0xdeadbeef, bootstrap_sta !! 482 sos_umem_vmm_subsystem_setup(); >> 483 sos_dev_zero_subsystem_setup(); 1148 484 1149 /* 485 /* 1150 * System should be halted BEFORE here ! !! 486 * Initialize process stuff 1151 */ 487 */ >> 488 sos_process_subsystem_setup(); 1152 489 1153 490 1154 /* An operatig system never ends */ !! 491 /* Enabling the HW interrupts here, this will make the timer HW 1155 for (;;) !! 492 interrupt call the scheduler */ 1156 { !! 493 asm volatile ("sti\n"); 1157 /* Remove this instruction if you get a << 1158 exception (old 80386 CPU) */ << 1159 asm("hlt\n"); << 1160 494 1161 continue; !! 495 /* Start the 'init' process, which in turns launches the other 1162 } !! 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 !"); 1163 } 514 }
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