Navigation
- Accueil
- Présentation :
- FAQ
- Bugs et errata
- Contributions de lecteurs
- Téléchargements
- LXR (référencement des sources)
- Mailing-list
- Liens et Projets reliés
Site hébergé par :
Site hébergé par :
|
[ source navigation ] [ diff markup ] [ identifier search ] [ general search ] |
|||
|
||||
001 /* Copyright (C) 2004 The SOS Team 001 /* Copyright (C) 2004 The SOS Team 002 002 003 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 007 007 008 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 011 GNU General Public License for more details. 012 012 013 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 016 USA. 017 */ 017 */ 018 018 >> 019 #include <sos/errno.h> >> 020 019 /* Include definitions of the multiboot standa 021 /* Include definitions of the multiboot standard */ 020 #include <bootstrap/multiboot.h> 022 #include <bootstrap/multiboot.h> 021 #include <hwcore/idt.h> 023 #include <hwcore/idt.h> 022 #include <hwcore/gdt.h> 024 #include <hwcore/gdt.h> 023 #include <hwcore/irq.h> 025 #include <hwcore/irq.h> 024 #include <hwcore/exception.h> 026 #include <hwcore/exception.h> 025 #include <hwcore/i8254.h> 027 #include <hwcore/i8254.h> 026 #include <sos/list.h> 028 #include <sos/list.h> 027 #include <sos/physmem.h> 029 #include <sos/physmem.h> 028 #include <hwcore/paging.h> 030 #include <hwcore/paging.h> >> 031 #include <hwcore/mm_context.h> >> 032 #include <hwcore/swintr.h> 029 #include <sos/kmem_vmm.h> 033 #include <sos/kmem_vmm.h> 030 #include <sos/kmalloc.h> 034 #include <sos/kmalloc.h> 031 #include <sos/time.h> 035 #include <sos/time.h> 032 #include <sos/thread.h> 036 #include <sos/thread.h> >> 037 #include <sos/process.h> >> 038 #include <sos/umem_vmm.h> 033 #include <sos/klibc.h> 039 #include <sos/klibc.h> 034 #include <sos/assert.h> 040 #include <sos/assert.h> 035 #include <drivers/x86_videomem.h> 041 #include <drivers/x86_videomem.h> 036 #include <drivers/bochs.h> 042 #include <drivers/bochs.h> 037 !! 043 #include <sos/calcload.h> >> 044 #include <sos/umem_vmm.h> >> 045 #include <sos/binfmt_elf32.h> >> 046 #include <drivers/zero.h> >> 047 #include <sos/fs.h> >> 048 #include <drivers/fs_virtfs.h> >> 049 #include <drivers/devices.h> >> 050 #include <drivers/mem.h> >> 051 #include <drivers/tty.h> >> 052 #include <drivers/console.h> >> 053 #include <drivers/serial.h> 038 054 039 /* Helper function to display each bits of a 3 055 /* Helper function to display each bits of a 32bits integer on the 040 screen as dark or light carrets */ 056 screen as dark or light carrets */ 041 void display_bits(unsigned char row, unsigned 057 void display_bits(unsigned char row, unsigned char col, 042 unsigned char attribute, 058 unsigned char attribute, 043 sos_ui32_t integer) 059 sos_ui32_t integer) 044 { 060 { 045 int i; 061 int i; 046 /* Scan each bit of the integer, MSb first * 062 /* Scan each bit of the integer, MSb first */ 047 for (i = 31 ; i >= 0 ; i--) 063 for (i = 31 ; i >= 0 ; i--) 048 { 064 { 049 /* Test if bit i of 'integer' is set */ 065 /* Test if bit i of 'integer' is set */ 050 int bit_i = (integer & (1 << i)); 066 int bit_i = (integer & (1 << i)); 051 /* Ascii 219 => dark carret, Ascii 177 = 067 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 052 unsigned char ascii_code = bit_i?219:177 068 unsigned char ascii_code = bit_i?219:177; 053 sos_x86_videomem_putchar(row, col++, 069 sos_x86_videomem_putchar(row, col++, 054 attribute, 070 attribute, 055 ascii_code); 071 ascii_code); 056 } 072 } 057 } 073 } 058 074 059 << 060 /* Clock IRQ handler */ 075 /* Clock IRQ handler */ 061 static void clk_it(int intid) 076 static void clk_it(int intid) 062 { 077 { 063 static sos_ui32_t clock_count = 0; 078 static sos_ui32_t clock_count = 0; 064 079 065 display_bits(0, 48, 080 display_bits(0, 48, 066 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 081 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 067 clock_count); 082 clock_count); 068 clock_count++; 083 clock_count++; 069 084 070 /* Execute the expired timeout actions (if a 085 /* Execute the expired timeout actions (if any) */ 071 sos_time_do_tick(); 086 sos_time_do_tick(); >> 087 >> 088 /* Update scheduler statistics and status */ >> 089 sos_sched_do_timer_tick(); 072 } 090 } 073 091 074 092 075 /* =========================================== 093 /* ====================================================================== 076 * Page fault exception handling 094 * Page fault exception handling 077 */ 095 */ 078 096 079 /* Helper function to dump a backtrace on boch << 080 static void dump_backtrace(const struct sos_cp << 081 sos_vaddr_t stack_b << 082 sos_size_t stack_s << 083 sos_bool_t on_conso << 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, << 092 << 093 /* Get the address of the first 3 argume << 094 frame. Among these arguments, 0, 1, 2 << 095 meaningful (depending on how many arg << 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 argu << 103 stack boundaries */ << 104 #define INTERVAL_OK(b,v,u) ( ((b) <= (sos_vadd << 105 && ((sos_vaddr_t) << 106 if (!INTERVAL_OK(stack_bottom, arg1, sta << 107 arg1 = &invalid; << 108 if (!INTERVAL_OK(stack_bottom, arg2, sta << 109 arg2 = &invalid; << 110 if (!INTERVAL_OK(stack_bottom, arg3, sta << 111 arg3 = &invalid; << 112 if (!INTERVAL_OK(stack_bottom, arg4, sta << 113 arg4 = &invalid; << 114 << 115 /* Print the function context for this f << 116 if (on_bochs) << 117 sos_bochs_printf("[%d] PC=0x%x arg1=0x << 118 (unsigned)depth, (uns << 119 (unsigned)*arg1, (uns << 120 (unsigned)*arg3); << 121 << 122 if (on_console) << 123 sos_x86_videomem_printf(23-depth, 3, << 124 SOS_X86_VIDEO_ << 125 | SOS_X86_VI << 126 "[%d] PC=0x%x << 127 (unsigned)dept << 128 (unsigned)*arg << 129 (unsigned)*arg << 130 << 131 } << 132 << 133 sos_backtrace(cpu_state, 15, stack_bottom, s << 134 } << 135 << 136 097 137 /* Page fault exception handler with demand pa 098 /* Page fault exception handler with demand paging for the kernel */ 138 static void pgflt_ex(int intid, const struct s !! 099 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 139 { 100 { 140 static sos_ui32_t demand_paging_count = 0; 101 static sos_ui32_t demand_paging_count = 0; 141 sos_vaddr_t faulting_vaddr = sos_cpu_context !! 102 struct sos_thread * cur_thr = sos_thread_get_current(); >> 103 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 142 sos_paddr_t ppage_paddr; 104 sos_paddr_t ppage_paddr; 143 105 >> 106 if (sos_cpu_context_is_in_user_mode(ctxt) >> 107 || (cur_thr->fixup_uaccess.return_vaddr)) >> 108 { >> 109 __label__ unforce_address_space; >> 110 sos_bool_t need_to_setup_mmu; >> 111 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); >> 112 >> 113 /* Make sure to always stay in the interrupted thread's MMU >> 114 configuration */ >> 115 need_to_setup_mmu = (cur_thr->squatted_mm_context >> 116 != sos_process_get_mm_context(cur_thr->process)); >> 117 if (need_to_setup_mmu) >> 118 sos_thread_prepare_user_space_access(NULL, 0); >> 119 >> 120 if (SOS_OK == >> 121 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, >> 122 errcode & (1 << 1), >> 123 TRUE)) >> 124 goto unforce_address_space; >> 125 >> 126 /* If the page fault occured in kernel mode, return to kernel to >> 127 the fixup address */ >> 128 if (! sos_cpu_context_is_in_user_mode(ctxt)) >> 129 { >> 130 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; >> 131 sos_cpu_context_set_EX_return_address(ctxt, >> 132 cur_thr->fixup_uaccess.return_vaddr); >> 133 goto unforce_address_space; >> 134 } >> 135 >> 136 if (need_to_setup_mmu) >> 137 sos_thread_end_user_space_access(); >> 138 >> 139 sos_bochs_printf("Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\n", >> 140 sos_cpu_context_get_PC(ctxt), >> 141 (unsigned)faulting_vaddr, >> 142 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 143 sos_bochs_printf("Terminating User thread\n"); >> 144 sos_thread_exit(); >> 145 >> 146 unforce_address_space: >> 147 if (need_to_setup_mmu) >> 148 sos_thread_end_user_space_access(); >> 149 return; >> 150 } >> 151 144 /* Check if address is covered by any VMM ra 152 /* Check if address is covered by any VMM range */ 145 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 153 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 146 { 154 { 147 /* No: The page fault is out of any kern 155 /* No: The page fault is out of any kernel virtual region. For 148 the moment, we don't handle this. */ 156 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 157 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", 154 sos_cpu_context_ 158 sos_cpu_context_get_PC(ctxt), 155 (unsigned)faulti 159 (unsigned)faulting_vaddr, 156 (unsigned)sos_cp 160 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 157 SOS_ASSERT_FATAL(! "Got page fault (note 161 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 158 } 162 } 159 163 160 164 161 /* 165 /* 162 * Demand paging !! 166 * Demand paging in kernel space 163 */ 167 */ 164 168 165 /* Update the number of demand paging reques 169 /* Update the number of demand paging requests handled */ 166 demand_paging_count ++; 170 demand_paging_count ++; 167 display_bits(0, 0, 171 display_bits(0, 0, 168 SOS_X86_VIDEO_FG_LTRED | SOS_X8 172 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 169 demand_paging_count); 173 demand_paging_count); 170 174 171 /* Allocate a new page for the virtual addre 175 /* Allocate a new page for the virtual address */ 172 ppage_paddr = sos_physmem_ref_physpage_new(F 176 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 173 if (! ppage_paddr) 177 if (! ppage_paddr) 174 SOS_ASSERT_FATAL(! "TODO: implement swap. 178 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(pp 179 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 176 SO 180 SOS_PAGE_ALIGN_INF(faulting_vaddr), 177 FA 181 FALSE, 178 SO 182 SOS_VM_MAP_PROT_READ 179 | 183 | SOS_VM_MAP_PROT_WRITE 180 | 184 | SOS_VM_MAP_ATOMIC)); 181 sos_physmem_unref_physpage(ppage_paddr); 185 sos_physmem_unref_physpage(ppage_paddr); 182 186 183 /* Ok, we can now return to interrupted cont 187 /* Ok, we can now return to interrupted context */ 184 } 188 } 185 189 186 190 >> 191 187 /* =========================================== 192 /* ====================================================================== 188 * Demonstrate the use of SOS kernel threads !! 193 * An operating system MUST always have a ready thread ! Otherwise: 189 * - Kernel Threads are created with various !! 194 * what would the CPU have to execute ?! 190 * state is printed on both the console and << 191 * - For tests regarding threads' synchroniza << 192 */ 195 */ 193 !! 196 static void idle_thread() 194 struct thr_arg << 195 { << 196 char character; << 197 int color; << 198 << 199 int col; << 200 int row; << 201 }; << 202 << 203 << 204 static void demo_thread(void *arg) << 205 { 197 { 206 struct thr_arg *thr_arg = (struct thr_arg*)a !! 198 sos_ui32_t idle_twiddle = 0; 207 int progress = 0; << 208 199 209 sos_bochs_printf("start %c", thr_arg->charac << 210 while (1) 200 while (1) 211 { 201 { 212 progress ++; !! 202 /* Remove this instruction if you get an "Invalid opcode" CPU 213 display_bits(thr_arg->row, thr_arg->col+ !! 203 exception (old 80386 CPU) */ 214 !! 204 asm("hlt\n"); 215 sos_bochs_putchar(thr_arg->character); << 216 << 217 /* Yield the CPU to another thread somet << 218 if ((random() % 100) == 0) << 219 { << 220 sos_bochs_printf("[37myield(%c)[m\ << 221 sos_x86_videomem_putchar(thr_arg->ro << 222 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 223 sos_x86_videomem_putchar(thr_arg->ro << 224 } << 225 << 226 /* Go to sleep some other times... */ << 227 else if ((random() % 200) == 0) << 228 { << 229 struct sos_time t = (struct sos_time << 230 sos_bochs_printf("[37msleep1(%c)[m << 231 sos_x86_videomem_putchar(thr_arg->ro << 232 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 233 SOS_ASSERT_FATAL(sos_time_is_zero(& << 234 sos_x86_videomem_putchar(thr_arg->ro << 235 } << 236 << 237 /* Go to sleep for a longer time some ot << 238 else if ((random() % 300) == 0) << 239 { << 240 struct sos_time t = (struct sos_time << 241 sos_bochs_printf("[37msleep2(%c)[m << 242 sos_x86_videomem_putchar(thr_arg->ro << 243 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 244 SOS_ASSERT_FATAL(sos_time_is_zero(& << 245 sos_x86_videomem_putchar(thr_arg->ro << 246 } << 247 205 248 /* Infinite loop otherwise */ !! 206 idle_twiddle ++; >> 207 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, >> 208 idle_twiddle); >> 209 >> 210 /* Lend the CPU to some other thread */ >> 211 sos_thread_yield(); 249 } 212 } 250 } 213 } 251 214 252 215 253 static void test_thread() !! 216 /* ====================================================================== >> 217 * Kernel thread showing some CPU usage statistics on the console every 1s >> 218 */ >> 219 #define LOAD_DISPLAY_BASELINE 4 >> 220 #define LOAD_DISPLAY_STARTROW 34 >> 221 static void stat_thread() 254 { 222 { 255 /* "static" variables because we want them t !! 223 while (1) 256 function returns */ !! 224 { 257 static struct thr_arg arg_b, arg_c, arg_d, a !! 225 sos_ui32_t flags; 258 sos_ui32_t flags; !! 226 sos_ui32_t load1, load5, load15; 259 !! 227 char str1[11], str5[11], str15[11]; 260 sos_disable_IRQs(flags); !! 228 struct sos_time t; >> 229 t.sec = 1; >> 230 t.nanosec = 0; >> 231 >> 232 sos_thread_sleep(& t); >> 233 >> 234 sos_disable_IRQs(flags); >> 235 >> 236 /* The IDLE task is EXcluded in the following computation */ >> 237 sos_load_get_sload(&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(LOAD_DISPLAY_BASELINE+0, LOAD_DISPLAY_STARTROW, >> 242 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 243 "Kernel (- Idle): %s %s %s ", >> 244 str1, str5, str15); >> 245 >> 246 sos_load_get_uload(&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(LOAD_DISPLAY_BASELINE+1, LOAD_DISPLAY_STARTROW, >> 251 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 252 "User: %s %s %s ", >> 253 str1, str5, str15); >> 254 >> 255 sos_load_get_uratio(&load1, &load5, &load15); >> 256 sos_load_to_string(str1, load1); >> 257 sos_load_to_string(str5, load5); >> 258 sos_load_to_string(str15, load15); >> 259 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+2, LOAD_DISPLAY_STARTROW, >> 260 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 261 "User CPU %%: %s %s %s ", >> 262 str1, str5, str15); >> 263 >> 264 /* The IDLE task is INcluded in the following computation */ >> 265 sos_load_get_sratio(&load1, &load5, &load15); >> 266 sos_load_to_string(str1, load1); >> 267 sos_load_to_string(str5, load5); >> 268 sos_load_to_string(str15, load15); >> 269 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+3, LOAD_DISPLAY_STARTROW, >> 270 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 271 "Kernel CPU %% (+ Idle): %s %s %s ", >> 272 str1, str5, str15); >> 273 sos_restore_IRQs(flags); >> 274 } >> 275 } 261 276 262 arg_b = (struct thr_arg) { .character='b', . << 263 sos_create_kernel_thread("YO[b]", demo_threa << 264 277 265 arg_c = (struct thr_arg) { .character='c', . !! 278 /* ====================================================================== 266 sos_create_kernel_thread("YO[c]", demo_threa !! 279 * Start the "init" (userland) process >> 280 */ >> 281 static sos_ret_t >> 282 start_init(struct sos_fs_manager_instance * rootfs) >> 283 { >> 284 sos_ret_t retval; >> 285 struct sos_umem_vmm_as *as_init; >> 286 struct sos_process *proc_init; >> 287 struct sos_thread *new_thr; >> 288 sos_uaddr_t ustack, start_uaddr; >> 289 struct sos_fs_opened_file * init_root, * init_cwd, * unused_of; >> 290 >> 291 /* Create the new process */ >> 292 proc_init = sos_process_create("init", FALSE); >> 293 if (! proc_init) >> 294 return -SOS_ENOMEM; >> 295 as_init = sos_process_get_address_space(proc_init); 267 296 268 arg_d = (struct thr_arg) { .character='d', . << 269 sos_create_kernel_thread("YO[d]", demo_threa << 270 297 271 arg_e = (struct thr_arg) { .character='e', . !! 298 /* 272 sos_create_kernel_thread("YO[e]", demo_threa !! 299 * Setup the root and CWD directories of the process. The root of >> 300 * this process will correspond to the "global" root of the whole >> 301 * system since all the future processes will duplicate it ! >> 302 */ >> 303 retval = sos_fs_new_opened_file(proc_init, rootfs->root, >> 304 SOS_FS_OPEN_READ | SOS_FS_OPEN_WRITE, >> 305 & init_root); >> 306 if (SOS_OK != retval) >> 307 { >> 308 sos_process_unref(proc_init); >> 309 return -SOS_ENOENT; >> 310 } 273 311 274 arg_R = (struct thr_arg) { .character='R', . !! 312 /* Duplicate the root file to set the current working directory of 275 sos_create_kernel_thread("YO[R]", demo_threa !! 313 the init process */ >> 314 retval = sos_fs_duplicate_opened_file(init_root, proc_init, >> 315 & init_cwd); >> 316 if (SOS_OK != retval) >> 317 { >> 318 sos_fs_close(init_root); >> 319 sos_process_unref(proc_init); >> 320 return -SOS_ENOENT; >> 321 } 276 322 277 arg_S = (struct thr_arg) { .character='S', . !! 323 /* Now update the process ! */ 278 sos_create_kernel_thread("YO[S]", demo_threa !! 324 if ( ( SOS_OK != sos_process_chroot(proc_init, init_root, & unused_of) ) >> 325 || ( SOS_OK != sos_process_chdir(proc_init, init_cwd, & unused_of) ) ) >> 326 { >> 327 sos_fs_close(init_root); >> 328 sos_fs_close(init_cwd); >> 329 sos_process_chroot(proc_init, NULL, & unused_of); >> 330 sos_process_chdir(proc_init, NULL, & unused_of); >> 331 sos_process_unref(proc_init); >> 332 return -SOS_ENOENT; >> 333 } 279 334 280 sos_restore_IRQs(flags); << 281 } << 282 335 283 336 284 /* =========================================== !! 337 /* Map the 'init' program in user space */ 285 * An operating system MUST always have a read !! 338 start_uaddr = sos_binfmt_elf32_map(as_init, "init"); 286 * what would the CPU have to execute ?! !! 339 if (0 == start_uaddr) 287 */ !! 340 { 288 static void idle_thread() !! 341 sos_process_unref(proc_init); 289 { !! 342 return -SOS_ENOENT; 290 sos_ui32_t idle_twiddle = 0; !! 343 } 291 344 292 while (1) !! 345 /* Allocate the user stack */ >> 346 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; >> 347 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, >> 348 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, >> 349 /* PRIVATE */ 0); >> 350 if (SOS_OK != retval) 293 { 351 { 294 /* Remove this instruction if you get an !! 352 sos_process_unref(proc_init); 295 exception (old 80386 CPU) */ !! 353 return -SOS_ENOMEM; 296 asm("hlt\n"); !! 354 } 297 355 298 idle_twiddle ++; !! 356 /* Now create the user thread */ 299 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE !! 357 new_thr = sos_create_user_thread(NULL, 300 idle_twiddle); !! 358 proc_init, 301 !! 359 start_uaddr, 302 /* Lend the CPU to some other thread */ !! 360 0, 0, 303 sos_thread_yield(); !! 361 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, >> 362 SOS_SCHED_PRIO_TS_LOWEST); >> 363 if (! new_thr) >> 364 { >> 365 sos_process_unref(proc_init); >> 366 return -SOS_ENOMEM; 304 } 367 } >> 368 >> 369 sos_process_unref(proc_init); >> 370 return SOS_OK; 305 } 371 } 306 372 307 373 308 /* =========================================== 374 /* ====================================================================== 309 * The C entry point of our operating system 375 * The C entry point of our operating system 310 */ 376 */ 311 void sos_main(unsigned long magic, unsigned lo !! 377 void sos_main(unsigned long magic, unsigned long arg) 312 { 378 { 313 unsigned i; 379 unsigned i; 314 sos_paddr_t sos_kernel_core_base_paddr, sos_ 380 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 315 struct sos_time tick_resolution; 381 struct sos_time tick_resolution; >> 382 struct sos_fs_manager_instance * rootfs; 316 383 317 /* Grub sends us a structure, called multibo !! 384 /* Size of RAM above 1MB. Might be undefined ! */ 318 precious informations about the system, s !! 385 unsigned long int upper_mem = 0; 319 documentation for more information. */ << 320 multiboot_info_t *mbi; << 321 mbi = (multiboot_info_t *) addr; << 322 386 323 /* Setup bochs and console, and clear the co 387 /* Setup bochs and console, and clear the console */ 324 sos_bochs_setup(); !! 388 sos_bochs_subsystem_setup(); 325 389 326 sos_x86_videomem_setup(); 390 sos_x86_videomem_setup(); 327 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 391 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 328 392 329 /* Greetings from SOS */ 393 /* Greetings from SOS */ 330 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 394 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 331 /* Loaded with Grub */ !! 395 { 332 sos_x86_videomem_printf(1, 0, !! 396 /* Grub sends us a structure, called multiboot_info_t with a lot of 333 SOS_X86_VIDEO_FG_Y !! 397 precious informations about the system, see the multiboot 334 "Welcome From GRUB !! 398 documentation for more information. */ 335 "SOS article 6.5", !! 399 multiboot_info_t *mbi = (multiboot_info_t *) arg; 336 (unsigned)(mbi->me !! 400 337 (unsigned)mbi->mem !! 401 /* Multiboot says: "The value returned for upper memory is >> 402 maximally the address of the first upper memory hole minus 1 >> 403 megabyte.". It also adds: "It is not guaranteed to be this >> 404 value." aka "YMMV" ;) */ >> 405 upper_mem = mbi->mem_upper; >> 406 sos_x86_videomem_printf(1, 0, >> 407 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 408 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 409 "SOS article 9", ',', >> 410 (unsigned)(upper_mem >> 10) + 1, >> 411 (unsigned)upper_mem); >> 412 } >> 413 else if (magic == 0x42244224) >> 414 { >> 415 /* Loaded with SOS bootsect */ >> 416 upper_mem = arg; >> 417 sos_x86_videomem_printf(1, 0, >> 418 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 419 "Welcome to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 420 "SOS article 9", ',', >> 421 (unsigned)(upper_mem >> 10) + 1, >> 422 (unsigned)upper_mem); >> 423 } 338 else 424 else 339 /* Not loaded with grub */ !! 425 /* Not loaded with grub, not from an enhanced bootsect */ 340 sos_x86_videomem_printf(1, 0, 426 sos_x86_videomem_printf(1, 0, 341 SOS_X86_VIDEO_FG_Y 427 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 342 "Welcome to SOS ar !! 428 "Welcome to SOS article 9"); 343 429 344 sos_bochs_putstring("Message in a bochs: Thi !! 430 sos_bochs_putstring("Message in a bochs: This is SOS article 9.\n"); 345 431 346 /* Setup CPU segmentation and IRQ subsystem 432 /* Setup CPU segmentation and IRQ subsystem */ 347 sos_gdt_subsystem_setup(); 433 sos_gdt_subsystem_setup(); 348 sos_idt_subsystem_setup(); 434 sos_idt_subsystem_setup(); 349 435 350 /* Setup SOS IRQs and exceptions subsystem * 436 /* Setup SOS IRQs and exceptions subsystem */ 351 sos_exception_subsystem_setup(); 437 sos_exception_subsystem_setup(); 352 sos_irq_subsystem_setup(); 438 sos_irq_subsystem_setup(); 353 439 354 /* Configure the timer so as to raise the IR 440 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 355 sos_i8254_set_frequency(100); 441 sos_i8254_set_frequency(100); 356 442 357 /* Setup the kernel time subsystem to get pr 443 /* Setup the kernel time subsystem to get prepared to take the timer 358 ticks into account */ 444 ticks into account */ 359 tick_resolution = (struct sos_time) { .sec=0 445 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 360 sos_time_subsysem_setup(& tick_resolution); 446 sos_time_subsysem_setup(& tick_resolution); 361 447 362 /* We need a multiboot-compliant boot loader !! 448 /* We need to know the RAM size */ 363 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) !! 449 if (upper_mem == 0) 364 { 450 { 365 sos_x86_videomem_putstring(20, 0, 451 sos_x86_videomem_putstring(20, 0, 366 SOS_X86_VIDEO 452 SOS_X86_VIDEO_FG_LTRED 367 | SOS_X86_V 453 | SOS_X86_VIDEO_BG_BLUE 368 | SOS_X86_V 454 | SOS_X86_VIDEO_FG_BLINKING, 369 "I'm not load !! 455 "I don't know RAM size ! Load me with Grub..."); 370 /* STOP ! */ 456 /* STOP ! */ 371 for (;;) 457 for (;;) 372 continue; 458 continue; 373 } 459 } 374 460 375 /* 461 /* 376 * Some interrupt handlers 462 * Some interrupt handlers 377 */ 463 */ 378 464 379 /* Binding some HW interrupts and exceptions 465 /* Binding some HW interrupts and exceptions to software routines */ 380 sos_irq_set_routine(SOS_IRQ_TIMER, 466 sos_irq_set_routine(SOS_IRQ_TIMER, 381 clk_it); 467 clk_it); 382 468 383 /* 469 /* 384 * Setup physical memory management 470 * Setup physical memory management 385 */ 471 */ 386 472 387 /* Multiboot says: "The value returned for u !! 473 SOS_ASSERT_FATAL(SOS_OK 388 the address of the first upper memory hol !! 474 == sos_physmem_subsystem_setup((upper_mem<<10) + (1<<20), 389 also adds: "It is not guaranteed to be th !! 475 &sos_kernel_core_base_paddr, 390 sos_physmem_subsystem_setup((mbi->mem_upper< !! 476 &sos_kernel_core_top_paddr)); 391 & sos_kernel_cor << 392 & sos_kernel_cor << 393 477 394 /* 478 /* 395 * Switch to paged-memory mode 479 * Switch to paged-memory mode 396 */ 480 */ 397 481 398 /* Disabling interrupts should seem more cor 482 /* Disabling interrupts should seem more correct, but it's not really 399 necessary at this stage */ 483 necessary at this stage */ 400 SOS_ASSERT_FATAL(SOS_OK == 484 SOS_ASSERT_FATAL(SOS_OK == 401 sos_paging_subsystem_setup( 485 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 402 486 sos_kernel_core_top_paddr)); 403 487 404 /* Bind the page fault exception */ 488 /* Bind the page fault exception */ 405 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 489 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 406 pgflt_ex); 490 pgflt_ex); 407 491 408 /* 492 /* 409 * Setup kernel virtual memory allocator 493 * Setup kernel virtual memory allocator 410 */ 494 */ 411 495 412 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 496 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 413 sos_kernel_ 497 sos_kernel_core_top_paddr, 414 bootstrap_s 498 bootstrap_stack_bottom, 415 bootstrap_s 499 bootstrap_stack_bottom 416 + bootstrap 500 + bootstrap_stack_size)) 417 sos_bochs_printf("Could not setup the Kern 501 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 418 502 419 if (sos_kmalloc_subsystem_setup()) 503 if (sos_kmalloc_subsystem_setup()) 420 sos_bochs_printf("Could not setup the Kmal 504 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 421 505 422 /* 506 /* >> 507 * Initialize the MMU context subsystem >> 508 */ >> 509 sos_mm_context_subsystem_setup(); >> 510 >> 511 /* >> 512 * Initialize the CPU context subsystem >> 513 */ >> 514 sos_cpu_context_subsystem_setup(); >> 515 >> 516 /* >> 517 * Bind the syscall handler to its software interrupt handler >> 518 */ >> 519 sos_swintr_subsystem_setup(); >> 520 >> 521 >> 522 /* 423 * Initialize the Kernel thread and schedule 523 * Initialize the Kernel thread and scheduler subsystems 424 */ 524 */ 425 525 426 /* Initialize kernel thread subsystem */ 526 /* Initialize kernel thread subsystem */ 427 sos_thread_subsystem_setup(bootstrap_stack_b 527 sos_thread_subsystem_setup(bootstrap_stack_bottom, 428 bootstrap_stack_s 528 bootstrap_stack_size); 429 529 430 /* Initialize the scheduler */ 530 /* Initialize the scheduler */ 431 sos_sched_subsystem_setup(); 531 sos_sched_subsystem_setup(); 432 532 433 /* Declare the IDLE thread */ 533 /* Declare the IDLE thread */ 434 SOS_ASSERT_FATAL(sos_create_kernel_thread("i !! 534 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, >> 535 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 536 >> 537 /* Prepare the stats subsystem */ >> 538 sos_load_subsystem_setup(); >> 539 >> 540 /* Declare a thread that prints some stats */ >> 541 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, >> 542 NULL, >> 543 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 544 >> 545 >> 546 /* >> 547 * Initialise user address space management subsystem >> 548 */ >> 549 sos_umem_vmm_subsystem_setup(); >> 550 sos_dev_zero_subsystem_setup(); >> 551 sos_dev_mem_chardev_setup(); >> 552 >> 553 /* >> 554 * Initialize process stuff >> 555 */ >> 556 sos_process_subsystem_setup(); >> 557 435 558 436 /* Enabling the HW interrupts here, this wil 559 /* Enabling the HW interrupts here, this will make the timer HW 437 interrupt call the scheduler */ 560 interrupt call the scheduler */ 438 asm volatile ("sti\n"); 561 asm volatile ("sti\n"); 439 562 440 563 441 /* Now run some Kernel threads just for fun !! 564 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_subsystem_setup()); 442 extern void MouseSim(); !! 565 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_setup(NULL, 443 MouseSim(); !! 566 "virtfs", 444 test_thread(); !! 567 NULL, >> 568 & rootfs)); >> 569 >> 570 >> 571 tty_subsystem_setup(); >> 572 sos_ttyS0_subsystem_setup(); >> 573 sos_console_subsystem_setup(); >> 574 >> 575 >> 576 445 577 >> 578 /* Start the 'init' process, which in turns launches the other >> 579 programs */ >> 580 start_init(rootfs); 446 /* 581 /* 447 * We can safely exit from this function now 582 * We can safely exit from this function now, for there is already 448 * an idle Kernel thread ready to make the C 583 * an idle Kernel thread ready to make the CPU busy working... 449 * 584 * 450 * However, we must EXPLICITELY call sos_thr 585 * However, we must EXPLICITELY call sos_thread_exit() because a 451 * simple "return" will return nowhere ! Act 586 * simple "return" will return nowhere ! Actually this first thread 452 * was initialized by the Grub bootstrap sta 587 * was initialized by the Grub bootstrap stage, at a time when the 453 * word "thread" did not exist. This means t 588 * word "thread" did not exist. This means that the stack was not 454 * setup in order for a return here to call 589 * setup in order for a return here to call sos_thread_exit() 455 * automagically. Hence we must call it manu 590 * automagically. Hence we must call it manually. This is the ONLY 456 * kernel thread where we must do this manua 591 * kernel thread where we must do this manually. 457 */ 592 */ 458 sos_bochs_printf("Bye from primary thread !\ 593 sos_bochs_printf("Bye from primary thread !\n"); 459 sos_thread_exit(); 594 sos_thread_exit(); 460 SOS_FATAL_ERROR("No trespassing !"); 595 SOS_FATAL_ERROR("No trespassing !"); 461 } 596 }
| [ source navigation ] | [ diff markup ] | [ identifier search ] | [ general search ] |