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