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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> 038 049 039 /* Helper function to display each bits of a 3 050 /* Helper function to display each bits of a 32bits integer on the 040 screen as dark or light carrets */ 051 screen as dark or light carrets */ 041 void display_bits(unsigned char row, unsigned 052 void display_bits(unsigned char row, unsigned char col, 042 unsigned char attribute, 053 unsigned char attribute, 043 sos_ui32_t integer) 054 sos_ui32_t integer) 044 { 055 { 045 int i; 056 int i; 046 /* Scan each bit of the integer, MSb first * 057 /* Scan each bit of the integer, MSb first */ 047 for (i = 31 ; i >= 0 ; i--) 058 for (i = 31 ; i >= 0 ; i--) 048 { 059 { 049 /* Test if bit i of 'integer' is set */ 060 /* Test if bit i of 'integer' is set */ 050 int bit_i = (integer & (1 << i)); 061 int bit_i = (integer & (1 << i)); 051 /* Ascii 219 => dark carret, Ascii 177 = 062 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 052 unsigned char ascii_code = bit_i?219:177 063 unsigned char ascii_code = bit_i?219:177; 053 sos_x86_videomem_putchar(row, col++, 064 sos_x86_videomem_putchar(row, col++, 054 attribute, 065 attribute, 055 ascii_code); 066 ascii_code); 056 } 067 } 057 } 068 } 058 069 059 << 060 /* Clock IRQ handler */ 070 /* Clock IRQ handler */ 061 static void clk_it(int intid) 071 static void clk_it(int intid) 062 { 072 { 063 static sos_ui32_t clock_count = 0; 073 static sos_ui32_t clock_count = 0; 064 074 065 display_bits(0, 48, 075 display_bits(0, 48, 066 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 076 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 067 clock_count); 077 clock_count); 068 clock_count++; 078 clock_count++; 069 079 070 /* Execute the expired timeout actions (if a 080 /* Execute the expired timeout actions (if any) */ 071 sos_time_do_tick(); 081 sos_time_do_tick(); >> 082 >> 083 /* Update scheduler statistics and status */ >> 084 sos_sched_do_timer_tick(); 072 } 085 } 073 086 074 087 075 /* =========================================== 088 /* ====================================================================== 076 * Page fault exception handling 089 * Page fault exception handling 077 */ 090 */ 078 091 079 /* 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 << 136 092 137 /* Page fault exception handler with demand pa 093 /* Page fault exception handler with demand paging for the kernel */ 138 static void pgflt_ex(int intid, const struct s !! 094 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 139 { 095 { 140 static sos_ui32_t demand_paging_count = 0; 096 static sos_ui32_t demand_paging_count = 0; 141 sos_vaddr_t faulting_vaddr = sos_cpu_context !! 097 struct sos_thread * cur_thr = sos_thread_get_current(); >> 098 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 142 sos_paddr_t ppage_paddr; 099 sos_paddr_t ppage_paddr; 143 100 >> 101 if (sos_cpu_context_is_in_user_mode(ctxt) >> 102 || (cur_thr->fixup_uaccess.return_vaddr)) >> 103 { >> 104 __label__ unforce_address_space; >> 105 sos_bool_t need_to_setup_mmu; >> 106 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); >> 107 >> 108 /* Make sure to always stay in the interrupted thread's MMU >> 109 configuration */ >> 110 need_to_setup_mmu = (cur_thr->squatted_mm_context >> 111 != sos_process_get_mm_context(cur_thr->process)); >> 112 if (need_to_setup_mmu) >> 113 sos_thread_prepare_user_space_access(NULL, 0); >> 114 >> 115 if (SOS_OK == >> 116 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, >> 117 errcode & (1 << 1), >> 118 TRUE)) >> 119 goto unforce_address_space; >> 120 >> 121 /* If the page fault occured in kernel mode, return to kernel to >> 122 the fixup address */ >> 123 if (! sos_cpu_context_is_in_user_mode(ctxt)) >> 124 { >> 125 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; >> 126 sos_cpu_context_set_EX_return_address(ctxt, >> 127 cur_thr->fixup_uaccess.return_vaddr); >> 128 goto unforce_address_space; >> 129 } >> 130 >> 131 if (need_to_setup_mmu) >> 132 sos_thread_end_user_space_access(); >> 133 >> 134 sos_bochs_printf("Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\n", >> 135 sos_cpu_context_get_PC(ctxt), >> 136 (unsigned)faulting_vaddr, >> 137 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 138 sos_bochs_printf("Terminating User thread\n"); >> 139 sos_thread_exit(); >> 140 >> 141 unforce_address_space: >> 142 if (need_to_setup_mmu) >> 143 sos_thread_end_user_space_access(); >> 144 return; >> 145 } >> 146 144 /* Check if address is covered by any VMM ra 147 /* Check if address is covered by any VMM range */ 145 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 148 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 146 { 149 { 147 /* No: The page fault is out of any kern 150 /* No: The page fault is out of any kernel virtual region. For 148 the moment, we don't handle this. */ 151 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 152 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", 154 sos_cpu_context_ 153 sos_cpu_context_get_PC(ctxt), 155 (unsigned)faulti 154 (unsigned)faulting_vaddr, 156 (unsigned)sos_cp 155 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 157 SOS_ASSERT_FATAL(! "Got page fault (note 156 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 158 } 157 } 159 158 160 159 161 /* 160 /* 162 * Demand paging !! 161 * Demand paging in kernel space 163 */ 162 */ 164 163 165 /* Update the number of demand paging reques 164 /* Update the number of demand paging requests handled */ 166 demand_paging_count ++; 165 demand_paging_count ++; 167 display_bits(0, 0, 166 display_bits(0, 0, 168 SOS_X86_VIDEO_FG_LTRED | SOS_X8 167 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 169 demand_paging_count); 168 demand_paging_count); 170 169 171 /* Allocate a new page for the virtual addre 170 /* Allocate a new page for the virtual address */ 172 ppage_paddr = sos_physmem_ref_physpage_new(F 171 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 173 if (! ppage_paddr) 172 if (! ppage_paddr) 174 SOS_ASSERT_FATAL(! "TODO: implement swap. 173 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 174 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 176 SO 175 SOS_PAGE_ALIGN_INF(faulting_vaddr), 177 FA 176 FALSE, 178 SO 177 SOS_VM_MAP_PROT_READ 179 | 178 | SOS_VM_MAP_PROT_WRITE 180 | 179 | SOS_VM_MAP_ATOMIC)); 181 sos_physmem_unref_physpage(ppage_paddr); 180 sos_physmem_unref_physpage(ppage_paddr); 182 181 183 /* Ok, we can now return to interrupted cont 182 /* Ok, we can now return to interrupted context */ 184 } 183 } 185 184 186 185 >> 186 187 /* =========================================== 187 /* ====================================================================== 188 * Demonstrate the use of SOS kernel threads !! 188 * An operating system MUST always have a ready thread ! Otherwise: 189 * - Kernel Threads are created with various !! 189 * what would the CPU have to execute ?! 190 * state is printed on both the console and << 191 * - For tests regarding threads' synchroniza << 192 */ 190 */ 193 !! 191 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 { 192 { 206 struct thr_arg *thr_arg = (struct thr_arg*)a !! 193 sos_ui32_t idle_twiddle = 0; 207 int progress = 0; << 208 194 209 sos_bochs_printf("start %c", thr_arg->charac << 210 while (1) 195 while (1) 211 { 196 { 212 progress ++; !! 197 /* Remove this instruction if you get an "Invalid opcode" CPU 213 display_bits(thr_arg->row, thr_arg->col+ !! 198 exception (old 80386 CPU) */ 214 !! 199 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 } << 247 200 248 /* Infinite loop otherwise */ !! 201 idle_twiddle ++; >> 202 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, >> 203 idle_twiddle); >> 204 >> 205 /* Lend the CPU to some other thread */ >> 206 sos_thread_yield(); 249 } 207 } 250 } 208 } 251 209 252 210 253 static void test_thread() !! 211 /* ====================================================================== >> 212 * Kernel thread showing some CPU usage statistics on the console every 1s >> 213 */ >> 214 static void stat_thread() 254 { 215 { 255 /* "static" variables because we want them t !! 216 while (1) 256 function returns */ !! 217 { 257 static struct thr_arg arg_b, arg_c, arg_d, a !! 218 sos_ui32_t flags; 258 sos_ui32_t flags; !! 219 sos_ui32_t load1, load5, load15; 259 !! 220 char str1[11], str5[11], str15[11]; 260 sos_disable_IRQs(flags); !! 221 struct sos_time t; 261 !! 222 t.sec = 1; 262 arg_b = (struct thr_arg) { .character='b', . !! 223 t.nanosec = 0; 263 sos_create_kernel_thread("YO[b]", demo_threa !! 224 264 !! 225 sos_thread_sleep(& t); 265 arg_c = (struct thr_arg) { .character='c', . !! 226 266 sos_create_kernel_thread("YO[c]", demo_threa !! 227 sos_disable_IRQs(flags); >> 228 >> 229 /* The IDLE task is EXcluded in the following computation */ >> 230 sos_load_get_sload(&load1, &load5, &load15); >> 231 sos_load_to_string(str1, load1); >> 232 sos_load_to_string(str5, load5); >> 233 sos_load_to_string(str15, load15); >> 234 sos_x86_videomem_printf(16, 34, >> 235 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 236 "Kernel (- Idle): %s %s %s ", >> 237 str1, str5, str15); >> 238 >> 239 sos_load_get_uload(&load1, &load5, &load15); >> 240 sos_load_to_string(str1, load1); >> 241 sos_load_to_string(str5, load5); >> 242 sos_load_to_string(str15, load15); >> 243 sos_x86_videomem_printf(17, 34, >> 244 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 245 "User: %s %s %s ", >> 246 str1, str5, str15); >> 247 >> 248 sos_load_get_uratio(&load1, &load5, &load15); >> 249 sos_load_to_string(str1, load1); >> 250 sos_load_to_string(str5, load5); >> 251 sos_load_to_string(str15, load15); >> 252 sos_x86_videomem_printf(18, 34, >> 253 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 254 "User CPU %%: %s %s %s ", >> 255 str1, str5, str15); >> 256 >> 257 /* The IDLE task is INcluded in the following computation */ >> 258 sos_load_get_sratio(&load1, &load5, &load15); >> 259 sos_load_to_string(str1, load1); >> 260 sos_load_to_string(str5, load5); >> 261 sos_load_to_string(str15, load15); >> 262 sos_x86_videomem_printf(19, 34, >> 263 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 264 "Kernel CPU %% (+ Idle): %s %s %s ", >> 265 str1, str5, str15); >> 266 sos_restore_IRQs(flags); >> 267 } >> 268 } 267 269 268 arg_d = (struct thr_arg) { .character='d', . << 269 sos_create_kernel_thread("YO[d]", demo_threa << 270 270 271 arg_e = (struct thr_arg) { .character='e', . !! 271 /* ====================================================================== 272 sos_create_kernel_thread("YO[e]", demo_threa !! 272 * Start the "init" (userland) process >> 273 */ >> 274 static sos_ret_t >> 275 start_init(struct sos_fs_manager_instance * rootfs) >> 276 { >> 277 sos_ret_t retval; >> 278 struct sos_umem_vmm_as *as_init; >> 279 struct sos_process *proc_init; >> 280 struct sos_thread *new_thr; >> 281 sos_uaddr_t ustack, start_uaddr; >> 282 struct sos_fs_opened_file * init_root, * init_cwd, * unused_of; >> 283 >> 284 /* Create the new process */ >> 285 proc_init = sos_process_create("init", FALSE); >> 286 if (! proc_init) >> 287 return -SOS_ENOMEM; >> 288 as_init = sos_process_get_address_space(proc_init); 273 289 274 arg_R = (struct thr_arg) { .character='R', . << 275 sos_create_kernel_thread("YO[R]", demo_threa << 276 290 277 arg_S = (struct thr_arg) { .character='S', . !! 291 /* 278 sos_create_kernel_thread("YO[S]", demo_threa !! 292 * Setup the root and CWD directories of the process. The root of >> 293 * this process will correspond to the "global" root of the whole >> 294 * system since all the future processes will duplicate it ! >> 295 */ >> 296 retval = sos_fs_new_opened_file(proc_init, rootfs->root, >> 297 SOS_FS_OPEN_READ | SOS_FS_OPEN_WRITE, >> 298 & init_root); >> 299 if (SOS_OK != retval) >> 300 { >> 301 sos_process_unref(proc_init); >> 302 return -SOS_ENOENT; >> 303 } 279 304 280 sos_restore_IRQs(flags); !! 305 /* Duplicate the root file to set the current working directory of 281 } !! 306 the init process */ >> 307 retval = sos_fs_duplicate_opened_file(init_root, proc_init, >> 308 & init_cwd); >> 309 if (SOS_OK != retval) >> 310 { >> 311 sos_fs_close(init_root); >> 312 sos_process_unref(proc_init); >> 313 return -SOS_ENOENT; >> 314 } 282 315 >> 316 /* Now update the process ! */ >> 317 if ( ( SOS_OK != sos_process_chroot(proc_init, init_root, & unused_of) ) >> 318 || ( SOS_OK != sos_process_chdir(proc_init, init_cwd, & unused_of) ) ) >> 319 { >> 320 sos_fs_close(init_root); >> 321 sos_fs_close(init_cwd); >> 322 sos_process_chroot(proc_init, NULL, & unused_of); >> 323 sos_process_chdir(proc_init, NULL, & unused_of); >> 324 sos_process_unref(proc_init); >> 325 return -SOS_ENOENT; >> 326 } 283 327 284 /* =========================================== !! 328 /* Map the 'init' program in user space */ 285 * An operating system MUST always have a read !! 329 start_uaddr = sos_binfmt_elf32_map(as_init, "init"); 286 * what would the CPU have to execute ?! !! 330 if (0 == start_uaddr) 287 */ !! 331 { 288 static void idle_thread() !! 332 sos_process_unref(proc_init); 289 { !! 333 return -SOS_ENOENT; 290 sos_ui32_t idle_twiddle = 0; !! 334 } 291 335 292 while (1) !! 336 /* Allocate the user stack */ >> 337 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; >> 338 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, >> 339 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, >> 340 /* PRIVATE */ 0); >> 341 if (SOS_OK != retval) 293 { 342 { 294 /* Remove this instruction if you get an !! 343 sos_process_unref(proc_init); 295 exception (old 80386 CPU) */ !! 344 return -SOS_ENOMEM; 296 asm("hlt\n"); !! 345 } 297 346 298 idle_twiddle ++; !! 347 /* Now create the user thread */ 299 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE !! 348 new_thr = sos_create_user_thread(NULL, 300 idle_twiddle); !! 349 proc_init, 301 !! 350 start_uaddr, 302 /* Lend the CPU to some other thread */ !! 351 0, 0, 303 sos_thread_yield(); !! 352 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, >> 353 SOS_SCHED_PRIO_TS_LOWEST); >> 354 if (! new_thr) >> 355 { >> 356 sos_process_unref(proc_init); >> 357 return -SOS_ENOMEM; 304 } 358 } >> 359 >> 360 sos_process_unref(proc_init); >> 361 return SOS_OK; 305 } 362 } 306 363 307 364 308 /* =========================================== 365 /* ====================================================================== 309 * The C entry point of our operating system 366 * The C entry point of our operating system 310 */ 367 */ 311 void sos_main(unsigned long magic, unsigned lo !! 368 void sos_main(unsigned long magic, unsigned long arg) 312 { 369 { 313 unsigned i; 370 unsigned i; 314 sos_paddr_t sos_kernel_core_base_paddr, sos_ 371 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 315 struct sos_time tick_resolution; 372 struct sos_time tick_resolution; >> 373 struct sos_fs_manager_instance * rootfs; 316 374 317 /* Grub sends us a structure, called multibo !! 375 /* Size of RAM above 1MB. Might be undefined ! */ 318 precious informations about the system, s !! 376 unsigned long int upper_mem = 0; 319 documentation for more information. */ << 320 multiboot_info_t *mbi; << 321 mbi = (multiboot_info_t *) addr; << 322 377 323 /* Setup bochs and console, and clear the co 378 /* Setup bochs and console, and clear the console */ 324 sos_bochs_setup(); 379 sos_bochs_setup(); 325 380 326 sos_x86_videomem_setup(); 381 sos_x86_videomem_setup(); 327 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 382 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 328 383 329 /* Greetings from SOS */ 384 /* Greetings from SOS */ 330 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 385 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 331 /* Loaded with Grub */ !! 386 { 332 sos_x86_videomem_printf(1, 0, !! 387 /* Grub sends us a structure, called multiboot_info_t with a lot of 333 SOS_X86_VIDEO_FG_Y !! 388 precious informations about the system, see the multiboot 334 "Welcome From GRUB !! 389 documentation for more information. */ 335 "SOS article 6.5", !! 390 multiboot_info_t *mbi = (multiboot_info_t *) arg; 336 (unsigned)(mbi->me !! 391 337 (unsigned)mbi->mem !! 392 /* Multiboot says: "The value returned for upper memory is >> 393 maximally the address of the first upper memory hole minus 1 >> 394 megabyte.". It also adds: "It is not guaranteed to be this >> 395 value." aka "YMMV" ;) */ >> 396 upper_mem = mbi->mem_upper; >> 397 sos_x86_videomem_printf(1, 0, >> 398 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 399 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 400 "SOS article 8", ',', >> 401 (unsigned)(upper_mem >> 10) + 1, >> 402 (unsigned)upper_mem); >> 403 } >> 404 else if (magic == 0x42244224) >> 405 { >> 406 /* Loaded with SOS bootsect */ >> 407 upper_mem = arg; >> 408 sos_x86_videomem_printf(1, 0, >> 409 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 410 "Welcome to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 411 "SOS article 8", ',', >> 412 (unsigned)(upper_mem >> 10) + 1, >> 413 (unsigned)upper_mem); >> 414 } 338 else 415 else 339 /* Not loaded with grub */ !! 416 /* Not loaded with grub, not from an enhanced bootsect */ 340 sos_x86_videomem_printf(1, 0, 417 sos_x86_videomem_printf(1, 0, 341 SOS_X86_VIDEO_FG_Y 418 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 342 "Welcome to SOS ar !! 419 "Welcome to SOS article 8"); 343 420 344 sos_bochs_putstring("Message in a bochs: Thi !! 421 sos_bochs_putstring("Message in a bochs: This is SOS article 8.\n"); 345 422 346 /* Setup CPU segmentation and IRQ subsystem 423 /* Setup CPU segmentation and IRQ subsystem */ 347 sos_gdt_subsystem_setup(); 424 sos_gdt_subsystem_setup(); 348 sos_idt_subsystem_setup(); 425 sos_idt_subsystem_setup(); 349 426 350 /* Setup SOS IRQs and exceptions subsystem * 427 /* Setup SOS IRQs and exceptions subsystem */ 351 sos_exception_subsystem_setup(); 428 sos_exception_subsystem_setup(); 352 sos_irq_subsystem_setup(); 429 sos_irq_subsystem_setup(); 353 430 354 /* Configure the timer so as to raise the IR 431 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 355 sos_i8254_set_frequency(100); 432 sos_i8254_set_frequency(100); 356 433 357 /* Setup the kernel time subsystem to get pr 434 /* Setup the kernel time subsystem to get prepared to take the timer 358 ticks into account */ 435 ticks into account */ 359 tick_resolution = (struct sos_time) { .sec=0 436 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 360 sos_time_subsysem_setup(& tick_resolution); 437 sos_time_subsysem_setup(& tick_resolution); 361 438 362 /* We need a multiboot-compliant boot loader !! 439 /* We need to know the RAM size */ 363 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) !! 440 if (upper_mem == 0) 364 { 441 { 365 sos_x86_videomem_putstring(20, 0, 442 sos_x86_videomem_putstring(20, 0, 366 SOS_X86_VIDEO 443 SOS_X86_VIDEO_FG_LTRED 367 | SOS_X86_V 444 | SOS_X86_VIDEO_BG_BLUE 368 | SOS_X86_V 445 | SOS_X86_VIDEO_FG_BLINKING, 369 "I'm not load !! 446 "I don't know RAM size ! Load me with Grub..."); 370 /* STOP ! */ 447 /* STOP ! */ 371 for (;;) 448 for (;;) 372 continue; 449 continue; 373 } 450 } 374 451 375 /* 452 /* 376 * Some interrupt handlers 453 * Some interrupt handlers 377 */ 454 */ 378 455 379 /* Binding some HW interrupts and exceptions 456 /* Binding some HW interrupts and exceptions to software routines */ 380 sos_irq_set_routine(SOS_IRQ_TIMER, 457 sos_irq_set_routine(SOS_IRQ_TIMER, 381 clk_it); 458 clk_it); 382 459 383 /* 460 /* 384 * Setup physical memory management 461 * Setup physical memory management 385 */ 462 */ 386 463 387 /* Multiboot says: "The value returned for u !! 464 SOS_ASSERT_FATAL(SOS_OK 388 the address of the first upper memory hol !! 465 == sos_physmem_subsystem_setup((upper_mem<<10) + (1<<20), 389 also adds: "It is not guaranteed to be th !! 466 &sos_kernel_core_base_paddr, 390 sos_physmem_subsystem_setup((mbi->mem_upper< !! 467 &sos_kernel_core_top_paddr)); 391 & sos_kernel_cor << 392 & sos_kernel_cor << 393 468 394 /* 469 /* 395 * Switch to paged-memory mode 470 * Switch to paged-memory mode 396 */ 471 */ 397 472 398 /* Disabling interrupts should seem more cor 473 /* Disabling interrupts should seem more correct, but it's not really 399 necessary at this stage */ 474 necessary at this stage */ 400 SOS_ASSERT_FATAL(SOS_OK == 475 SOS_ASSERT_FATAL(SOS_OK == 401 sos_paging_subsystem_setup( 476 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 402 477 sos_kernel_core_top_paddr)); 403 478 404 /* Bind the page fault exception */ 479 /* Bind the page fault exception */ 405 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 480 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 406 pgflt_ex); 481 pgflt_ex); 407 482 408 /* 483 /* 409 * Setup kernel virtual memory allocator 484 * Setup kernel virtual memory allocator 410 */ 485 */ 411 486 412 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 487 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 413 sos_kernel_ 488 sos_kernel_core_top_paddr, 414 bootstrap_s 489 bootstrap_stack_bottom, 415 bootstrap_s 490 bootstrap_stack_bottom 416 + bootstrap 491 + bootstrap_stack_size)) 417 sos_bochs_printf("Could not setup the Kern 492 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 418 493 419 if (sos_kmalloc_subsystem_setup()) 494 if (sos_kmalloc_subsystem_setup()) 420 sos_bochs_printf("Could not setup the Kmal 495 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 421 496 422 /* 497 /* >> 498 * Initialize the MMU context subsystem >> 499 */ >> 500 sos_mm_context_subsystem_setup(); >> 501 >> 502 /* >> 503 * Initialize the CPU context subsystem >> 504 */ >> 505 sos_cpu_context_subsystem_setup(); >> 506 >> 507 /* >> 508 * Bind the syscall handler to its software interrupt handler >> 509 */ >> 510 sos_swintr_subsystem_setup(); >> 511 >> 512 >> 513 /* 423 * Initialize the Kernel thread and schedule 514 * Initialize the Kernel thread and scheduler subsystems 424 */ 515 */ 425 516 426 /* Initialize kernel thread subsystem */ 517 /* Initialize kernel thread subsystem */ 427 sos_thread_subsystem_setup(bootstrap_stack_b 518 sos_thread_subsystem_setup(bootstrap_stack_bottom, 428 bootstrap_stack_s 519 bootstrap_stack_size); 429 520 430 /* Initialize the scheduler */ 521 /* Initialize the scheduler */ 431 sos_sched_subsystem_setup(); 522 sos_sched_subsystem_setup(); 432 523 433 /* Declare the IDLE thread */ 524 /* Declare the IDLE thread */ 434 SOS_ASSERT_FATAL(sos_create_kernel_thread("i !! 525 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, >> 526 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 527 >> 528 /* Prepare the stats subsystem */ >> 529 sos_load_subsystem_setup(); >> 530 >> 531 /* Declare a thread that prints some stats */ >> 532 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, >> 533 NULL, >> 534 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 535 >> 536 >> 537 /* >> 538 * Initialise user address space management subsystem >> 539 */ >> 540 sos_umem_vmm_subsystem_setup(); >> 541 sos_dev_zero_subsystem_setup(); >> 542 >> 543 /* >> 544 * Initialize process stuff >> 545 */ >> 546 sos_process_subsystem_setup(); >> 547 435 548 436 /* Enabling the HW interrupts here, this wil 549 /* Enabling the HW interrupts here, this will make the timer HW 437 interrupt call the scheduler */ 550 interrupt call the scheduler */ 438 asm volatile ("sti\n"); 551 asm volatile ("sti\n"); 439 552 440 553 441 /* Now run some Kernel threads just for fun !! 554 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_subsystem_setup()); 442 extern void MouseSim(); !! 555 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_setup(NULL, 443 MouseSim(); !! 556 "virtfs", 444 test_thread(); !! 557 NULL, >> 558 & rootfs)); >> 559 445 560 >> 561 /* Start the 'init' process, which in turns launches the other >> 562 programs */ >> 563 start_init(rootfs); 446 /* 564 /* 447 * We can safely exit from this function now 565 * We can safely exit from this function now, for there is already 448 * an idle Kernel thread ready to make the C 566 * an idle Kernel thread ready to make the CPU busy working... 449 * 567 * 450 * However, we must EXPLICITELY call sos_thr 568 * However, we must EXPLICITELY call sos_thread_exit() because a 451 * simple "return" will return nowhere ! Act 569 * simple "return" will return nowhere ! Actually this first thread 452 * was initialized by the Grub bootstrap sta 570 * was initialized by the Grub bootstrap stage, at a time when the 453 * word "thread" did not exist. This means t 571 * word "thread" did not exist. This means that the stack was not 454 * setup in order for a return here to call 572 * setup in order for a return here to call sos_thread_exit() 455 * automagically. Hence we must call it manu 573 * automagically. Hence we must call it manually. This is the ONLY 456 * kernel thread where we must do this manua 574 * kernel thread where we must do this manually. 457 */ 575 */ 458 sos_bochs_printf("Bye from primary thread !\ 576 sos_bochs_printf("Bye from primary thread !\n"); 459 sos_thread_exit(); 577 sos_thread_exit(); 460 SOS_FATAL_ERROR("No trespassing !"); 578 SOS_FATAL_ERROR("No trespassing !"); 461 } 579 }
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