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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 << 021 /* Include definitions of the multiboot standa 019 /* Include definitions of the multiboot standard */ 022 #include <bootstrap/multiboot.h> 020 #include <bootstrap/multiboot.h> 023 #include <hwcore/idt.h> 021 #include <hwcore/idt.h> 024 #include <hwcore/gdt.h> 022 #include <hwcore/gdt.h> 025 #include <hwcore/irq.h> 023 #include <hwcore/irq.h> 026 #include <hwcore/exception.h> 024 #include <hwcore/exception.h> 027 #include <hwcore/i8254.h> 025 #include <hwcore/i8254.h> 028 #include <sos/list.h> 026 #include <sos/list.h> 029 #include <sos/physmem.h> 027 #include <sos/physmem.h> 030 #include <hwcore/paging.h> 028 #include <hwcore/paging.h> 031 #include <hwcore/mm_context.h> 029 #include <hwcore/mm_context.h> 032 #include <hwcore/swintr.h> 030 #include <hwcore/swintr.h> 033 #include <sos/kmem_vmm.h> 031 #include <sos/kmem_vmm.h> 034 #include <sos/kmalloc.h> 032 #include <sos/kmalloc.h> 035 #include <sos/time.h> 033 #include <sos/time.h> 036 #include <sos/thread.h> 034 #include <sos/thread.h> 037 #include <sos/process.h> 035 #include <sos/process.h> 038 #include <sos/umem_vmm.h> 036 #include <sos/umem_vmm.h> 039 #include <sos/klibc.h> 037 #include <sos/klibc.h> 040 #include <sos/assert.h> 038 #include <sos/assert.h> 041 #include <drivers/x86_videomem.h> 039 #include <drivers/x86_videomem.h> 042 #include <drivers/bochs.h> 040 #include <drivers/bochs.h> 043 #include <sos/calcload.h> 041 #include <sos/calcload.h> 044 #include <sos/umem_vmm.h> 042 #include <sos/umem_vmm.h> 045 #include <sos/binfmt_elf32.h> 043 #include <sos/binfmt_elf32.h> 046 #include <drivers/zero.h> 044 #include <drivers/zero.h> 047 #include <sos/fs.h> !! 045 048 #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> << 054 046 055 /* Helper function to display each bits of a 3 047 /* Helper function to display each bits of a 32bits integer on the 056 screen as dark or light carrets */ 048 screen as dark or light carrets */ 057 void display_bits(unsigned char row, unsigned 049 void display_bits(unsigned char row, unsigned char col, 058 unsigned char attribute, 050 unsigned char attribute, 059 sos_ui32_t integer) 051 sos_ui32_t integer) 060 { 052 { 061 int i; 053 int i; 062 /* Scan each bit of the integer, MSb first * 054 /* Scan each bit of the integer, MSb first */ 063 for (i = 31 ; i >= 0 ; i--) 055 for (i = 31 ; i >= 0 ; i--) 064 { 056 { 065 /* Test if bit i of 'integer' is set */ 057 /* Test if bit i of 'integer' is set */ 066 int bit_i = (integer & (1 << i)); 058 int bit_i = (integer & (1 << i)); 067 /* Ascii 219 => dark carret, Ascii 177 = 059 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 068 unsigned char ascii_code = bit_i?219:177 060 unsigned char ascii_code = bit_i?219:177; 069 sos_x86_videomem_putchar(row, col++, 061 sos_x86_videomem_putchar(row, col++, 070 attribute, 062 attribute, 071 ascii_code); 063 ascii_code); 072 } 064 } 073 } 065 } 074 066 >> 067 075 /* Clock IRQ handler */ 068 /* Clock IRQ handler */ 076 static void clk_it(int intid) 069 static void clk_it(int intid) 077 { 070 { 078 static sos_ui32_t clock_count = 0; 071 static sos_ui32_t clock_count = 0; 079 072 080 display_bits(0, 48, 073 display_bits(0, 48, 081 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 074 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 082 clock_count); 075 clock_count); 083 clock_count++; 076 clock_count++; 084 077 085 /* Execute the expired timeout actions (if a 078 /* Execute the expired timeout actions (if any) */ 086 sos_time_do_tick(); 079 sos_time_do_tick(); 087 080 088 /* Update scheduler statistics and status */ 081 /* Update scheduler statistics and status */ 089 sos_sched_do_timer_tick(); 082 sos_sched_do_timer_tick(); 090 } 083 } 091 084 092 085 093 /* =========================================== 086 /* ====================================================================== 094 * Page fault exception handling 087 * Page fault exception handling 095 */ 088 */ 096 089 097 090 098 /* Page fault exception handler with demand pa 091 /* Page fault exception handler with demand paging for the kernel */ 099 static void pgflt_ex(int intid, struct sos_cpu 092 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 100 { 093 { 101 static sos_ui32_t demand_paging_count = 0; 094 static sos_ui32_t demand_paging_count = 0; 102 struct sos_thread * cur_thr = sos_thread_get 095 struct sos_thread * cur_thr = sos_thread_get_current(); 103 sos_vaddr_t faulting_vaddr = sos_cpu_contex 096 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 104 sos_paddr_t ppage_paddr; 097 sos_paddr_t ppage_paddr; 105 098 106 if (sos_cpu_context_is_in_user_mode(ctxt) 099 if (sos_cpu_context_is_in_user_mode(ctxt) 107 || (cur_thr->fixup_uaccess.return_vaddr) 100 || (cur_thr->fixup_uaccess.return_vaddr)) 108 { 101 { 109 __label__ unforce_address_space; 102 __label__ unforce_address_space; 110 sos_bool_t need_to_setup_mmu; 103 sos_bool_t need_to_setup_mmu; 111 sos_ui32_t errcode = sos_cpu_context_get 104 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); 112 105 113 /* Make sure to always stay in the inter 106 /* Make sure to always stay in the interrupted thread's MMU 114 configuration */ 107 configuration */ 115 need_to_setup_mmu = (cur_thr->squatted_m 108 need_to_setup_mmu = (cur_thr->squatted_mm_context 116 != sos_process_get_ 109 != sos_process_get_mm_context(cur_thr->process)); 117 if (need_to_setup_mmu) 110 if (need_to_setup_mmu) 118 sos_thread_prepare_user_space_access(N 111 sos_thread_prepare_user_space_access(NULL, 0); 119 112 120 if (SOS_OK == 113 if (SOS_OK == 121 sos_umem_vmm_try_resolve_page_fault( 114 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, 122 115 errcode & (1 << 1), 123 116 TRUE)) 124 goto unforce_address_space; 117 goto unforce_address_space; 125 118 126 /* If the page fault occured in kernel m 119 /* If the page fault occured in kernel mode, return to kernel to 127 the fixup address */ 120 the fixup address */ 128 if (! sos_cpu_context_is_in_user_mode(ct 121 if (! sos_cpu_context_is_in_user_mode(ctxt)) 129 { 122 { 130 cur_thr->fixup_uaccess.faulted_uaddr 123 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; 131 sos_cpu_context_set_EX_return_addres 124 sos_cpu_context_set_EX_return_address(ctxt, 132 125 cur_thr->fixup_uaccess.return_vaddr); 133 goto unforce_address_space; 126 goto unforce_address_space; 134 } 127 } 135 128 136 if (need_to_setup_mmu) 129 if (need_to_setup_mmu) 137 sos_thread_end_user_space_access(); 130 sos_thread_end_user_space_access(); 138 131 139 sos_bochs_printf("Unresolved USER page F 132 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( 133 sos_cpu_context_get_PC(ctxt), 141 (unsigned)faulting_vadd 134 (unsigned)faulting_vaddr, 142 (unsigned)sos_cpu_conte 135 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 143 sos_bochs_printf("Terminating User threa 136 sos_bochs_printf("Terminating User thread\n"); 144 sos_thread_exit(); 137 sos_thread_exit(); 145 138 146 unforce_address_space: 139 unforce_address_space: 147 if (need_to_setup_mmu) 140 if (need_to_setup_mmu) 148 sos_thread_end_user_space_access(); 141 sos_thread_end_user_space_access(); 149 return; 142 return; 150 } 143 } 151 144 152 /* Check if address is covered by any VMM ra 145 /* Check if address is covered by any VMM range */ 153 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 146 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 154 { 147 { 155 /* No: The page fault is out of any kern 148 /* No: The page fault is out of any kernel virtual region. For 156 the moment, we don't handle this. */ 149 the moment, we don't handle this. */ 157 sos_display_fatal_error("Unresolved page 150 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", 158 sos_cpu_context_ 151 sos_cpu_context_get_PC(ctxt), 159 (unsigned)faulti 152 (unsigned)faulting_vaddr, 160 (unsigned)sos_cp 153 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 161 SOS_ASSERT_FATAL(! "Got page fault (note 154 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 162 } 155 } 163 156 164 157 165 /* 158 /* 166 * Demand paging in kernel space 159 * Demand paging in kernel space 167 */ 160 */ 168 161 169 /* Update the number of demand paging reques 162 /* Update the number of demand paging requests handled */ 170 demand_paging_count ++; 163 demand_paging_count ++; 171 display_bits(0, 0, 164 display_bits(0, 0, 172 SOS_X86_VIDEO_FG_LTRED | SOS_X8 165 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 173 demand_paging_count); 166 demand_paging_count); 174 167 175 /* Allocate a new page for the virtual addre 168 /* Allocate a new page for the virtual address */ 176 ppage_paddr = sos_physmem_ref_physpage_new(F 169 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 177 if (! ppage_paddr) 170 if (! ppage_paddr) 178 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 !)"); 179 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 172 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 180 SO 173 SOS_PAGE_ALIGN_INF(faulting_vaddr), 181 FA 174 FALSE, 182 SO 175 SOS_VM_MAP_PROT_READ 183 | 176 | SOS_VM_MAP_PROT_WRITE 184 | 177 | SOS_VM_MAP_ATOMIC)); 185 sos_physmem_unref_physpage(ppage_paddr); 178 sos_physmem_unref_physpage(ppage_paddr); 186 179 187 /* Ok, we can now return to interrupted cont 180 /* Ok, we can now return to interrupted context */ 188 } 181 } 189 182 190 183 191 184 192 /* =========================================== 185 /* ====================================================================== 193 * An operating system MUST always have a read 186 * An operating system MUST always have a ready thread ! Otherwise: 194 * what would the CPU have to execute ?! 187 * what would the CPU have to execute ?! 195 */ 188 */ 196 static void idle_thread() 189 static void idle_thread() 197 { 190 { 198 sos_ui32_t idle_twiddle = 0; 191 sos_ui32_t idle_twiddle = 0; 199 192 200 while (1) 193 while (1) 201 { 194 { 202 /* Remove this instruction if you get an 195 /* Remove this instruction if you get an "Invalid opcode" CPU 203 exception (old 80386 CPU) */ 196 exception (old 80386 CPU) */ 204 asm("hlt\n"); 197 asm("hlt\n"); 205 198 206 idle_twiddle ++; 199 idle_twiddle ++; 207 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE 200 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 208 idle_twiddle); 201 idle_twiddle); 209 202 210 /* Lend the CPU to some other thread */ 203 /* Lend the CPU to some other thread */ 211 sos_thread_yield(); 204 sos_thread_yield(); 212 } 205 } 213 } 206 } 214 207 215 208 216 /* =========================================== 209 /* ====================================================================== 217 * Kernel thread showing some CPU usage statis 210 * Kernel thread showing some CPU usage statistics on the console every 1s 218 */ 211 */ 219 #define LOAD_DISPLAY_BASELINE 4 << 220 #define LOAD_DISPLAY_STARTROW 34 << 221 static void stat_thread() 212 static void stat_thread() 222 { 213 { 223 while (1) 214 while (1) 224 { 215 { 225 sos_ui32_t flags; 216 sos_ui32_t flags; 226 sos_ui32_t load1, load5, load15; 217 sos_ui32_t load1, load5, load15; 227 char str1[11], str5[11], str15[11]; 218 char str1[11], str5[11], str15[11]; 228 struct sos_time t; 219 struct sos_time t; 229 t.sec = 1; 220 t.sec = 1; 230 t.nanosec = 0; 221 t.nanosec = 0; 231 222 232 sos_thread_sleep(& t); 223 sos_thread_sleep(& t); 233 224 234 sos_disable_IRQs(flags); 225 sos_disable_IRQs(flags); 235 226 236 /* The IDLE task is EXcluded in the foll 227 /* The IDLE task is EXcluded in the following computation */ 237 sos_load_get_sload(&load1, &load5, &load 228 sos_load_get_sload(&load1, &load5, &load15); 238 sos_load_to_string(str1, load1); 229 sos_load_to_string(str1, load1); 239 sos_load_to_string(str5, load5); 230 sos_load_to_string(str5, load5); 240 sos_load_to_string(str15, load15); 231 sos_load_to_string(str15, load15); 241 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 232 sos_x86_videomem_printf(16, 34, 242 SOS_X86_VIDEO_FG 233 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 243 "Kernel (- Idle) 234 "Kernel (- Idle): %s %s %s ", 244 str1, str5, str1 235 str1, str5, str15); 245 236 246 sos_load_get_uload(&load1, &load5, &load 237 sos_load_get_uload(&load1, &load5, &load15); 247 sos_load_to_string(str1, load1); 238 sos_load_to_string(str1, load1); 248 sos_load_to_string(str5, load5); 239 sos_load_to_string(str5, load5); 249 sos_load_to_string(str15, load15); 240 sos_load_to_string(str15, load15); 250 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 241 sos_x86_videomem_printf(17, 34, 251 SOS_X86_VIDEO_FG 242 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 252 "User: %s %s %s 243 "User: %s %s %s ", 253 str1, str5, str1 244 str1, str5, str15); 254 245 255 sos_load_get_uratio(&load1, &load5, &loa 246 sos_load_get_uratio(&load1, &load5, &load15); 256 sos_load_to_string(str1, load1); 247 sos_load_to_string(str1, load1); 257 sos_load_to_string(str5, load5); 248 sos_load_to_string(str5, load5); 258 sos_load_to_string(str15, load15); 249 sos_load_to_string(str15, load15); 259 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 250 sos_x86_videomem_printf(18, 34, 260 SOS_X86_VIDEO_FG 251 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 261 "User CPU %%: %s 252 "User CPU %%: %s %s %s ", 262 str1, str5, str1 253 str1, str5, str15); 263 254 264 /* The IDLE task is INcluded in the foll 255 /* The IDLE task is INcluded in the following computation */ 265 sos_load_get_sratio(&load1, &load5, &loa 256 sos_load_get_sratio(&load1, &load5, &load15); 266 sos_load_to_string(str1, load1); 257 sos_load_to_string(str1, load1); 267 sos_load_to_string(str5, load5); 258 sos_load_to_string(str5, load5); 268 sos_load_to_string(str15, load15); 259 sos_load_to_string(str15, load15); 269 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 260 sos_x86_videomem_printf(19, 34, 270 SOS_X86_VIDEO_FG 261 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 271 "Kernel CPU %% ( 262 "Kernel CPU %% (+ Idle): %s %s %s ", 272 str1, str5, str1 263 str1, str5, str15); 273 sos_restore_IRQs(flags); 264 sos_restore_IRQs(flags); 274 } 265 } 275 } 266 } 276 267 277 268 278 /* =========================================== 269 /* ====================================================================== 279 * Start the "init" (userland) process 270 * Start the "init" (userland) process 280 */ 271 */ 281 static sos_ret_t !! 272 static sos_ret_t start_init() 282 start_init(struct sos_fs_manager_instance * ro << 283 { 273 { 284 sos_ret_t retval; 274 sos_ret_t retval; 285 struct sos_umem_vmm_as *as_init; 275 struct sos_umem_vmm_as *as_init; 286 struct sos_process *proc_init; 276 struct sos_process *proc_init; 287 struct sos_thread *new_thr; 277 struct sos_thread *new_thr; 288 sos_uaddr_t ustack, start_uaddr; 278 sos_uaddr_t ustack, start_uaddr; 289 struct sos_fs_opened_file * init_root, * ini << 290 279 291 /* Create the new process */ 280 /* Create the new process */ 292 proc_init = sos_process_create("init", FALSE 281 proc_init = sos_process_create("init", FALSE); 293 if (! proc_init) 282 if (! proc_init) 294 return -SOS_ENOMEM; 283 return -SOS_ENOMEM; 295 as_init = sos_process_get_address_space(proc 284 as_init = sos_process_get_address_space(proc_init); 296 285 297 << 298 /* << 299 * Setup the root and CWD directories of the << 300 * this process will correspond to the "glob << 301 * system since all the future processes wil << 302 */ << 303 retval = sos_fs_new_opened_file(proc_init, r << 304 SOS_FS_OPEN_ << 305 & init_root) << 306 if (SOS_OK != retval) << 307 { << 308 sos_process_unref(proc_init); << 309 return -SOS_ENOENT; << 310 } << 311 << 312 /* Duplicate the root file to set the curren << 313 the init process */ << 314 retval = sos_fs_duplicate_opened_file(init_r << 315 & init << 316 if (SOS_OK != retval) << 317 { << 318 sos_fs_close(init_root); << 319 sos_process_unref(proc_init); << 320 return -SOS_ENOENT; << 321 } << 322 << 323 /* Now update the process ! */ << 324 if ( ( SOS_OK != sos_process_chroot(proc_ini << 325 || ( SOS_OK != sos_process_chdir(proc_i << 326 { << 327 sos_fs_close(init_root); << 328 sos_fs_close(init_cwd); << 329 sos_process_chroot(proc_init, NULL, & un << 330 sos_process_chdir(proc_init, NULL, & unu << 331 sos_process_unref(proc_init); << 332 return -SOS_ENOENT; << 333 } << 334 << 335 << 336 << 337 /* Map the 'init' program in user space */ 286 /* Map the 'init' program in user space */ 338 start_uaddr = sos_binfmt_elf32_map(as_init, 287 start_uaddr = sos_binfmt_elf32_map(as_init, "init"); 339 if (0 == start_uaddr) 288 if (0 == start_uaddr) 340 { 289 { 341 sos_process_unref(proc_init); 290 sos_process_unref(proc_init); 342 return -SOS_ENOENT; 291 return -SOS_ENOENT; 343 } 292 } 344 !! 293 345 /* Allocate the user stack */ 294 /* Allocate the user stack */ 346 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ 295 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; 347 retval = sos_dev_zero_map(as_init, &ustack, 296 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, 348 SOS_VM_MAP_PROT_RE 297 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, 349 /* PRIVATE */ 0); 298 /* PRIVATE */ 0); 350 if (SOS_OK != retval) 299 if (SOS_OK != retval) 351 { 300 { >> 301 sos_bochs_printf("ici 2\n"); 352 sos_process_unref(proc_init); 302 sos_process_unref(proc_init); 353 return -SOS_ENOMEM; 303 return -SOS_ENOMEM; 354 } 304 } 355 305 356 /* Now create the user thread */ 306 /* Now create the user thread */ 357 new_thr = sos_create_user_thread(NULL, 307 new_thr = sos_create_user_thread(NULL, 358 proc_init, 308 proc_init, 359 start_uaddr 309 start_uaddr, 360 0, 0, 310 0, 0, 361 ustack + SO 311 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, 362 SOS_SCHED_P 312 SOS_SCHED_PRIO_TS_LOWEST); 363 if (! new_thr) 313 if (! new_thr) 364 { 314 { >> 315 sos_bochs_printf("ici 3\n"); 365 sos_process_unref(proc_init); 316 sos_process_unref(proc_init); 366 return -SOS_ENOMEM; 317 return -SOS_ENOMEM; 367 } 318 } 368 319 369 sos_process_unref(proc_init); 320 sos_process_unref(proc_init); 370 return SOS_OK; 321 return SOS_OK; 371 } 322 } 372 323 373 324 374 /* =========================================== 325 /* ====================================================================== 375 * The C entry point of our operating system 326 * The C entry point of our operating system 376 */ 327 */ 377 void sos_main(unsigned long magic, unsigned lo !! 328 void sos_main(unsigned long magic, unsigned long addr) 378 { 329 { 379 unsigned i; 330 unsigned i; 380 sos_paddr_t sos_kernel_core_base_paddr, sos_ 331 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 381 struct sos_time tick_resolution; 332 struct sos_time tick_resolution; 382 struct sos_fs_manager_instance * rootfs; << 383 333 384 /* Size of RAM above 1MB. Might be undefined !! 334 /* Grub sends us a structure, called multiboot_info_t with a lot of 385 unsigned long int upper_mem = 0; !! 335 precious informations about the system, see the multiboot >> 336 documentation for more information. */ >> 337 multiboot_info_t *mbi; >> 338 mbi = (multiboot_info_t *) addr; 386 339 387 /* Setup bochs and console, and clear the co 340 /* Setup bochs and console, and clear the console */ 388 sos_bochs_subsystem_setup(); !! 341 sos_bochs_setup(); 389 342 390 sos_x86_videomem_setup(); 343 sos_x86_videomem_setup(); 391 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 344 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 392 345 393 /* Greetings from SOS */ 346 /* Greetings from SOS */ 394 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 347 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 395 { !! 348 /* Loaded with Grub */ 396 /* Grub sends us a structure, called mul !! 349 sos_x86_videomem_printf(1, 0, 397 precious informations about the syste !! 350 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 398 documentation for more information. * !! 351 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 399 multiboot_info_t *mbi = (multiboot_info_ !! 352 "SOS article 7.5", ',', 400 !! 353 (unsigned)(mbi->mem_upper >> 10) + 1, 401 /* Multiboot says: "The value returned f !! 354 (unsigned)mbi->mem_upper); 402 maximally the address of the first up << 403 megabyte.". It also adds: "It is not << 404 value." aka "YMMV" ;) */ << 405 upper_mem = mbi->mem_upper; << 406 sos_x86_videomem_printf(1, 0, << 407 SOS_X86_VIDEO_FG << 408 "Welcome From GR << 409 "SOS article 9", << 410 (unsigned)(upper << 411 (unsigned)upper_ << 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 << 419 "Welcome to %s%c << 420 "SOS article 9", << 421 (unsigned)(upper << 422 (unsigned)upper_ << 423 } << 424 else 355 else 425 /* Not loaded with grub, not from an enhan !! 356 /* Not loaded with grub */ 426 sos_x86_videomem_printf(1, 0, 357 sos_x86_videomem_printf(1, 0, 427 SOS_X86_VIDEO_FG_Y 358 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 428 "Welcome to SOS ar !! 359 "Welcome to SOS article 7.5"); 429 360 430 sos_bochs_putstring("Message in a bochs: Thi !! 361 sos_bochs_putstring("Message in a bochs: This is SOS article 7.5.\n"); 431 362 432 /* Setup CPU segmentation and IRQ subsystem 363 /* Setup CPU segmentation and IRQ subsystem */ 433 sos_gdt_subsystem_setup(); 364 sos_gdt_subsystem_setup(); 434 sos_idt_subsystem_setup(); 365 sos_idt_subsystem_setup(); 435 366 436 /* Setup SOS IRQs and exceptions subsystem * 367 /* Setup SOS IRQs and exceptions subsystem */ 437 sos_exception_subsystem_setup(); 368 sos_exception_subsystem_setup(); 438 sos_irq_subsystem_setup(); 369 sos_irq_subsystem_setup(); 439 370 440 /* Configure the timer so as to raise the IR 371 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 441 sos_i8254_set_frequency(100); 372 sos_i8254_set_frequency(100); 442 373 443 /* Setup the kernel time subsystem to get pr 374 /* Setup the kernel time subsystem to get prepared to take the timer 444 ticks into account */ 375 ticks into account */ 445 tick_resolution = (struct sos_time) { .sec=0 376 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 446 sos_time_subsysem_setup(& tick_resolution); 377 sos_time_subsysem_setup(& tick_resolution); 447 378 448 /* We need to know the RAM size */ !! 379 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 449 if (upper_mem == 0) !! 380 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 450 { 381 { 451 sos_x86_videomem_putstring(20, 0, 382 sos_x86_videomem_putstring(20, 0, 452 SOS_X86_VIDEO 383 SOS_X86_VIDEO_FG_LTRED 453 | SOS_X86_V 384 | SOS_X86_VIDEO_BG_BLUE 454 | SOS_X86_V 385 | SOS_X86_VIDEO_FG_BLINKING, 455 "I don't know !! 386 "I'm not loaded with Grub !"); 456 /* STOP ! */ 387 /* STOP ! */ 457 for (;;) 388 for (;;) 458 continue; 389 continue; 459 } 390 } 460 391 461 /* 392 /* 462 * Some interrupt handlers 393 * Some interrupt handlers 463 */ 394 */ 464 395 465 /* Binding some HW interrupts and exceptions 396 /* Binding some HW interrupts and exceptions to software routines */ 466 sos_irq_set_routine(SOS_IRQ_TIMER, 397 sos_irq_set_routine(SOS_IRQ_TIMER, 467 clk_it); 398 clk_it); 468 399 469 /* 400 /* 470 * Setup physical memory management 401 * Setup physical memory management 471 */ 402 */ 472 403 473 SOS_ASSERT_FATAL(SOS_OK !! 404 /* Multiboot says: "The value returned for upper memory is maximally 474 == sos_physmem_subsystem_se !! 405 the address of the first upper memory hole minus 1 megabyte.". It 475 !! 406 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 476 !! 407 sos_physmem_subsystem_setup((mbi->mem_upper<<10) + (1<<20), >> 408 & sos_kernel_core_base_paddr, >> 409 & sos_kernel_core_top_paddr); 477 410 478 /* 411 /* 479 * Switch to paged-memory mode 412 * Switch to paged-memory mode 480 */ 413 */ 481 414 482 /* Disabling interrupts should seem more cor 415 /* Disabling interrupts should seem more correct, but it's not really 483 necessary at this stage */ 416 necessary at this stage */ 484 SOS_ASSERT_FATAL(SOS_OK == 417 SOS_ASSERT_FATAL(SOS_OK == 485 sos_paging_subsystem_setup( 418 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 486 419 sos_kernel_core_top_paddr)); 487 420 488 /* Bind the page fault exception */ 421 /* Bind the page fault exception */ 489 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 422 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 490 pgflt_ex); 423 pgflt_ex); 491 424 492 /* 425 /* 493 * Setup kernel virtual memory allocator 426 * Setup kernel virtual memory allocator 494 */ 427 */ 495 428 496 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 429 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 497 sos_kernel_ 430 sos_kernel_core_top_paddr, 498 bootstrap_s 431 bootstrap_stack_bottom, 499 bootstrap_s 432 bootstrap_stack_bottom 500 + bootstrap 433 + bootstrap_stack_size)) 501 sos_bochs_printf("Could not setup the Kern 434 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 502 435 503 if (sos_kmalloc_subsystem_setup()) 436 if (sos_kmalloc_subsystem_setup()) 504 sos_bochs_printf("Could not setup the Kmal 437 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 505 438 506 /* 439 /* 507 * Initialize the MMU context subsystem 440 * Initialize the MMU context subsystem 508 */ 441 */ 509 sos_mm_context_subsystem_setup(); 442 sos_mm_context_subsystem_setup(); 510 443 511 /* 444 /* 512 * Initialize the CPU context subsystem 445 * Initialize the CPU context subsystem 513 */ 446 */ 514 sos_cpu_context_subsystem_setup(); 447 sos_cpu_context_subsystem_setup(); 515 448 516 /* 449 /* 517 * Bind the syscall handler to its software 450 * Bind the syscall handler to its software interrupt handler 518 */ 451 */ 519 sos_swintr_subsystem_setup(); 452 sos_swintr_subsystem_setup(); 520 453 521 454 522 /* 455 /* 523 * Initialize the Kernel thread and schedule 456 * Initialize the Kernel thread and scheduler subsystems 524 */ 457 */ 525 458 526 /* Initialize kernel thread subsystem */ 459 /* Initialize kernel thread subsystem */ 527 sos_thread_subsystem_setup(bootstrap_stack_b 460 sos_thread_subsystem_setup(bootstrap_stack_bottom, 528 bootstrap_stack_s 461 bootstrap_stack_size); 529 462 530 /* Initialize the scheduler */ 463 /* Initialize the scheduler */ 531 sos_sched_subsystem_setup(); 464 sos_sched_subsystem_setup(); 532 465 533 /* Declare the IDLE thread */ 466 /* Declare the IDLE thread */ 534 SOS_ASSERT_FATAL(sos_create_kernel_thread("i 467 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, 535 SO 468 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 536 469 537 /* Prepare the stats subsystem */ 470 /* Prepare the stats subsystem */ 538 sos_load_subsystem_setup(); 471 sos_load_subsystem_setup(); 539 472 540 /* Declare a thread that prints some stats * 473 /* Declare a thread that prints some stats */ 541 SOS_ASSERT_FATAL(sos_create_kernel_thread("s 474 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, 542 NU 475 NULL, 543 SO 476 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 544 477 545 478 546 /* 479 /* 547 * Initialise user address space management 480 * Initialise user address space management subsystem 548 */ 481 */ 549 sos_umem_vmm_subsystem_setup(); 482 sos_umem_vmm_subsystem_setup(); 550 sos_dev_zero_subsystem_setup(); 483 sos_dev_zero_subsystem_setup(); 551 sos_dev_mem_chardev_setup(); << 552 484 553 /* 485 /* 554 * Initialize process stuff 486 * Initialize process stuff 555 */ 487 */ 556 sos_process_subsystem_setup(); 488 sos_process_subsystem_setup(); 557 489 558 490 559 /* Enabling the HW interrupts here, this wil 491 /* Enabling the HW interrupts here, this will make the timer HW 560 interrupt call the scheduler */ 492 interrupt call the scheduler */ 561 asm volatile ("sti\n"); 493 asm volatile ("sti\n"); 562 494 563 << 564 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_sub << 565 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_ << 566 << 567 << 568 << 569 << 570 << 571 tty_subsystem_setup(); << 572 sos_ttyS0_subsystem_setup(); << 573 sos_console_subsystem_setup(); << 574 << 575 << 576 << 577 << 578 /* Start the 'init' process, which in turns 495 /* Start the 'init' process, which in turns launches the other 579 programs */ 496 programs */ 580 start_init(rootfs); !! 497 start_init(); >> 498 581 /* 499 /* 582 * We can safely exit from this function now 500 * We can safely exit from this function now, for there is already 583 * an idle Kernel thread ready to make the C 501 * an idle Kernel thread ready to make the CPU busy working... 584 * 502 * 585 * However, we must EXPLICITELY call sos_thr 503 * However, we must EXPLICITELY call sos_thread_exit() because a 586 * simple "return" will return nowhere ! Act 504 * simple "return" will return nowhere ! Actually this first thread 587 * was initialized by the Grub bootstrap sta 505 * was initialized by the Grub bootstrap stage, at a time when the 588 * word "thread" did not exist. This means t 506 * word "thread" did not exist. This means that the stack was not 589 * setup in order for a return here to call 507 * setup in order for a return here to call sos_thread_exit() 590 * automagically. Hence we must call it manu 508 * automagically. Hence we must call it manually. This is the ONLY 591 * kernel thread where we must do this manua 509 * kernel thread where we must do this manually. 592 */ 510 */ 593 sos_bochs_printf("Bye from primary thread !\ 511 sos_bochs_printf("Bye from primary thread !\n"); 594 sos_thread_exit(); 512 sos_thread_exit(); 595 SOS_FATAL_ERROR("No trespassing !"); 513 SOS_FATAL_ERROR("No trespassing !"); 596 } 514 }
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