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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> 046 049 047 /* Helper function to display each bits of a 3 050 /* Helper function to display each bits of a 32bits integer on the 048 screen as dark or light carrets */ 051 screen as dark or light carrets */ 049 void display_bits(unsigned char row, unsigned 052 void display_bits(unsigned char row, unsigned char col, 050 unsigned char attribute, 053 unsigned char attribute, 051 sos_ui32_t integer) 054 sos_ui32_t integer) 052 { 055 { 053 int i; 056 int i; 054 /* Scan each bit of the integer, MSb first * 057 /* Scan each bit of the integer, MSb first */ 055 for (i = 31 ; i >= 0 ; i--) 058 for (i = 31 ; i >= 0 ; i--) 056 { 059 { 057 /* Test if bit i of 'integer' is set */ 060 /* Test if bit i of 'integer' is set */ 058 int bit_i = (integer & (1 << i)); 061 int bit_i = (integer & (1 << i)); 059 /* Ascii 219 => dark carret, Ascii 177 = 062 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 060 unsigned char ascii_code = bit_i?219:177 063 unsigned char ascii_code = bit_i?219:177; 061 sos_x86_videomem_putchar(row, col++, 064 sos_x86_videomem_putchar(row, col++, 062 attribute, 065 attribute, 063 ascii_code); 066 ascii_code); 064 } 067 } 065 } 068 } 066 069 067 << 068 /* Clock IRQ handler */ 070 /* Clock IRQ handler */ 069 static void clk_it(int intid) 071 static void clk_it(int intid) 070 { 072 { 071 static sos_ui32_t clock_count = 0; 073 static sos_ui32_t clock_count = 0; 072 074 073 display_bits(0, 48, 075 display_bits(0, 48, 074 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 076 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 075 clock_count); 077 clock_count); 076 clock_count++; 078 clock_count++; 077 079 078 /* Execute the expired timeout actions (if a 080 /* Execute the expired timeout actions (if any) */ 079 sos_time_do_tick(); 081 sos_time_do_tick(); 080 082 081 /* Update scheduler statistics and status */ 083 /* Update scheduler statistics and status */ 082 sos_sched_do_timer_tick(); 084 sos_sched_do_timer_tick(); 083 } 085 } 084 086 085 087 086 /* =========================================== 088 /* ====================================================================== 087 * Page fault exception handling 089 * Page fault exception handling 088 */ 090 */ 089 091 090 092 091 /* Page fault exception handler with demand pa 093 /* Page fault exception handler with demand paging for the kernel */ 092 static void pgflt_ex(int intid, struct sos_cpu 094 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 093 { 095 { 094 static sos_ui32_t demand_paging_count = 0; 096 static sos_ui32_t demand_paging_count = 0; 095 struct sos_thread * cur_thr = sos_thread_get 097 struct sos_thread * cur_thr = sos_thread_get_current(); 096 sos_vaddr_t faulting_vaddr = sos_cpu_contex 098 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 097 sos_paddr_t ppage_paddr; 099 sos_paddr_t ppage_paddr; 098 100 099 if (sos_cpu_context_is_in_user_mode(ctxt) 101 if (sos_cpu_context_is_in_user_mode(ctxt) 100 || (cur_thr->fixup_uaccess.return_vaddr) 102 || (cur_thr->fixup_uaccess.return_vaddr)) 101 { 103 { 102 __label__ unforce_address_space; 104 __label__ unforce_address_space; 103 sos_bool_t need_to_setup_mmu; 105 sos_bool_t need_to_setup_mmu; 104 sos_ui32_t errcode = sos_cpu_context_get 106 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); 105 107 106 /* Make sure to always stay in the inter 108 /* Make sure to always stay in the interrupted thread's MMU 107 configuration */ 109 configuration */ 108 need_to_setup_mmu = (cur_thr->squatted_m 110 need_to_setup_mmu = (cur_thr->squatted_mm_context 109 != sos_process_get_ 111 != sos_process_get_mm_context(cur_thr->process)); 110 if (need_to_setup_mmu) 112 if (need_to_setup_mmu) 111 sos_thread_prepare_user_space_access(N 113 sos_thread_prepare_user_space_access(NULL, 0); 112 114 113 if (SOS_OK == 115 if (SOS_OK == 114 sos_umem_vmm_try_resolve_page_fault( 116 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, 115 117 errcode & (1 << 1), 116 118 TRUE)) 117 goto unforce_address_space; 119 goto unforce_address_space; 118 120 119 /* If the page fault occured in kernel m 121 /* If the page fault occured in kernel mode, return to kernel to 120 the fixup address */ 122 the fixup address */ 121 if (! sos_cpu_context_is_in_user_mode(ct 123 if (! sos_cpu_context_is_in_user_mode(ctxt)) 122 { 124 { 123 cur_thr->fixup_uaccess.faulted_uaddr 125 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; 124 sos_cpu_context_set_EX_return_addres 126 sos_cpu_context_set_EX_return_address(ctxt, 125 127 cur_thr->fixup_uaccess.return_vaddr); 126 goto unforce_address_space; 128 goto unforce_address_space; 127 } 129 } 128 130 129 if (need_to_setup_mmu) 131 if (need_to_setup_mmu) 130 sos_thread_end_user_space_access(); 132 sos_thread_end_user_space_access(); 131 133 132 sos_bochs_printf("Unresolved USER page F 134 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( 135 sos_cpu_context_get_PC(ctxt), 134 (unsigned)faulting_vadd 136 (unsigned)faulting_vaddr, 135 (unsigned)sos_cpu_conte 137 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 136 sos_bochs_printf("Terminating User threa 138 sos_bochs_printf("Terminating User thread\n"); 137 sos_thread_exit(); 139 sos_thread_exit(); 138 140 139 unforce_address_space: 141 unforce_address_space: 140 if (need_to_setup_mmu) 142 if (need_to_setup_mmu) 141 sos_thread_end_user_space_access(); 143 sos_thread_end_user_space_access(); 142 return; 144 return; 143 } 145 } 144 146 145 /* Check if address is covered by any VMM ra 147 /* Check if address is covered by any VMM range */ 146 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 148 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 147 { 149 { 148 /* No: The page fault is out of any kern 150 /* No: The page fault is out of any kernel virtual region. For 149 the moment, we don't handle this. */ 151 the moment, we don't handle this. */ 150 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)!", 151 sos_cpu_context_ 153 sos_cpu_context_get_PC(ctxt), 152 (unsigned)faulti 154 (unsigned)faulting_vaddr, 153 (unsigned)sos_cp 155 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 154 SOS_ASSERT_FATAL(! "Got page fault (note 156 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 155 } 157 } 156 158 157 159 158 /* 160 /* 159 * Demand paging in kernel space 161 * Demand paging in kernel space 160 */ 162 */ 161 163 162 /* Update the number of demand paging reques 164 /* Update the number of demand paging requests handled */ 163 demand_paging_count ++; 165 demand_paging_count ++; 164 display_bits(0, 0, 166 display_bits(0, 0, 165 SOS_X86_VIDEO_FG_LTRED | SOS_X8 167 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 166 demand_paging_count); 168 demand_paging_count); 167 169 168 /* Allocate a new page for the virtual addre 170 /* Allocate a new page for the virtual address */ 169 ppage_paddr = sos_physmem_ref_physpage_new(F 171 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 170 if (! ppage_paddr) 172 if (! ppage_paddr) 171 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 !)"); 172 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 174 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 173 SO 175 SOS_PAGE_ALIGN_INF(faulting_vaddr), 174 FA 176 FALSE, 175 SO 177 SOS_VM_MAP_PROT_READ 176 | 178 | SOS_VM_MAP_PROT_WRITE 177 | 179 | SOS_VM_MAP_ATOMIC)); 178 sos_physmem_unref_physpage(ppage_paddr); 180 sos_physmem_unref_physpage(ppage_paddr); 179 181 180 /* Ok, we can now return to interrupted cont 182 /* Ok, we can now return to interrupted context */ 181 } 183 } 182 184 183 185 184 186 185 /* =========================================== 187 /* ====================================================================== 186 * An operating system MUST always have a read 188 * An operating system MUST always have a ready thread ! Otherwise: 187 * what would the CPU have to execute ?! 189 * what would the CPU have to execute ?! 188 */ 190 */ 189 static void idle_thread() 191 static void idle_thread() 190 { 192 { 191 sos_ui32_t idle_twiddle = 0; 193 sos_ui32_t idle_twiddle = 0; 192 194 193 while (1) 195 while (1) 194 { 196 { 195 /* Remove this instruction if you get an 197 /* Remove this instruction if you get an "Invalid opcode" CPU 196 exception (old 80386 CPU) */ 198 exception (old 80386 CPU) */ 197 asm("hlt\n"); 199 asm("hlt\n"); 198 200 199 idle_twiddle ++; 201 idle_twiddle ++; 200 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE 202 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 201 idle_twiddle); 203 idle_twiddle); 202 204 203 /* Lend the CPU to some other thread */ 205 /* Lend the CPU to some other thread */ 204 sos_thread_yield(); 206 sos_thread_yield(); 205 } 207 } 206 } 208 } 207 209 208 210 209 /* =========================================== 211 /* ====================================================================== 210 * Kernel thread showing some CPU usage statis 212 * Kernel thread showing some CPU usage statistics on the console every 1s 211 */ 213 */ 212 static void stat_thread() 214 static void stat_thread() 213 { 215 { 214 while (1) 216 while (1) 215 { 217 { 216 sos_ui32_t flags; 218 sos_ui32_t flags; 217 sos_ui32_t load1, load5, load15; 219 sos_ui32_t load1, load5, load15; 218 char str1[11], str5[11], str15[11]; 220 char str1[11], str5[11], str15[11]; 219 struct sos_time t; 221 struct sos_time t; 220 t.sec = 1; 222 t.sec = 1; 221 t.nanosec = 0; 223 t.nanosec = 0; 222 224 223 sos_thread_sleep(& t); 225 sos_thread_sleep(& t); 224 226 225 sos_disable_IRQs(flags); 227 sos_disable_IRQs(flags); 226 228 227 /* The IDLE task is EXcluded in the foll 229 /* The IDLE task is EXcluded in the following computation */ 228 sos_load_get_sload(&load1, &load5, &load 230 sos_load_get_sload(&load1, &load5, &load15); 229 sos_load_to_string(str1, load1); 231 sos_load_to_string(str1, load1); 230 sos_load_to_string(str5, load5); 232 sos_load_to_string(str5, load5); 231 sos_load_to_string(str15, load15); 233 sos_load_to_string(str15, load15); 232 sos_x86_videomem_printf(16, 34, 234 sos_x86_videomem_printf(16, 34, 233 SOS_X86_VIDEO_FG 235 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 234 "Kernel (- Idle) 236 "Kernel (- Idle): %s %s %s ", 235 str1, str5, str1 237 str1, str5, str15); 236 238 237 sos_load_get_uload(&load1, &load5, &load 239 sos_load_get_uload(&load1, &load5, &load15); 238 sos_load_to_string(str1, load1); 240 sos_load_to_string(str1, load1); 239 sos_load_to_string(str5, load5); 241 sos_load_to_string(str5, load5); 240 sos_load_to_string(str15, load15); 242 sos_load_to_string(str15, load15); 241 sos_x86_videomem_printf(17, 34, 243 sos_x86_videomem_printf(17, 34, 242 SOS_X86_VIDEO_FG 244 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 243 "User: %s %s %s 245 "User: %s %s %s ", 244 str1, str5, str1 246 str1, str5, str15); 245 247 246 sos_load_get_uratio(&load1, &load5, &loa 248 sos_load_get_uratio(&load1, &load5, &load15); 247 sos_load_to_string(str1, load1); 249 sos_load_to_string(str1, load1); 248 sos_load_to_string(str5, load5); 250 sos_load_to_string(str5, load5); 249 sos_load_to_string(str15, load15); 251 sos_load_to_string(str15, load15); 250 sos_x86_videomem_printf(18, 34, 252 sos_x86_videomem_printf(18, 34, 251 SOS_X86_VIDEO_FG 253 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 252 "User CPU %%: %s 254 "User CPU %%: %s %s %s ", 253 str1, str5, str1 255 str1, str5, str15); 254 256 255 /* The IDLE task is INcluded in the foll 257 /* The IDLE task is INcluded in the following computation */ 256 sos_load_get_sratio(&load1, &load5, &loa 258 sos_load_get_sratio(&load1, &load5, &load15); 257 sos_load_to_string(str1, load1); 259 sos_load_to_string(str1, load1); 258 sos_load_to_string(str5, load5); 260 sos_load_to_string(str5, load5); 259 sos_load_to_string(str15, load15); 261 sos_load_to_string(str15, load15); 260 sos_x86_videomem_printf(19, 34, 262 sos_x86_videomem_printf(19, 34, 261 SOS_X86_VIDEO_FG 263 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 262 "Kernel CPU %% ( 264 "Kernel CPU %% (+ Idle): %s %s %s ", 263 str1, str5, str1 265 str1, str5, str15); 264 sos_restore_IRQs(flags); 266 sos_restore_IRQs(flags); 265 } 267 } 266 } 268 } 267 269 268 270 269 /* =========================================== 271 /* ====================================================================== 270 * Start the "init" (userland) process 272 * Start the "init" (userland) process 271 */ 273 */ 272 static sos_ret_t start_init() !! 274 static sos_ret_t >> 275 start_init(struct sos_fs_manager_instance * rootfs) 273 { 276 { 274 sos_ret_t retval; 277 sos_ret_t retval; 275 struct sos_umem_vmm_as *as_init; 278 struct sos_umem_vmm_as *as_init; 276 struct sos_process *proc_init; 279 struct sos_process *proc_init; 277 struct sos_thread *new_thr; 280 struct sos_thread *new_thr; 278 sos_uaddr_t ustack, start_uaddr; 281 sos_uaddr_t ustack, start_uaddr; >> 282 struct sos_fs_opened_file * init_root, * init_cwd, * unused_of; 279 283 280 /* Create the new process */ 284 /* Create the new process */ 281 proc_init = sos_process_create("init", FALSE 285 proc_init = sos_process_create("init", FALSE); 282 if (! proc_init) 286 if (! proc_init) 283 return -SOS_ENOMEM; 287 return -SOS_ENOMEM; 284 as_init = sos_process_get_address_space(proc 288 as_init = sos_process_get_address_space(proc_init); 285 289 >> 290 >> 291 /* >> 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 } >> 304 >> 305 /* Duplicate the root file to set the current working directory of >> 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 } >> 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 } >> 327 286 /* Map the 'init' program in user space */ 328 /* Map the 'init' program in user space */ 287 start_uaddr = sos_binfmt_elf32_map(as_init, 329 start_uaddr = sos_binfmt_elf32_map(as_init, "init"); 288 if (0 == start_uaddr) 330 if (0 == start_uaddr) 289 { 331 { 290 sos_process_unref(proc_init); 332 sos_process_unref(proc_init); 291 return -SOS_ENOENT; 333 return -SOS_ENOENT; 292 } 334 } 293 !! 335 294 /* Allocate the user stack */ 336 /* Allocate the user stack */ 295 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ 337 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; 296 retval = sos_dev_zero_map(as_init, &ustack, 338 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, 297 SOS_VM_MAP_PROT_RE 339 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, 298 /* PRIVATE */ 0); 340 /* PRIVATE */ 0); 299 if (SOS_OK != retval) 341 if (SOS_OK != retval) 300 { 342 { 301 sos_bochs_printf("ici 2\n"); << 302 sos_process_unref(proc_init); 343 sos_process_unref(proc_init); 303 return -SOS_ENOMEM; 344 return -SOS_ENOMEM; 304 } 345 } 305 346 306 /* Now create the user thread */ 347 /* Now create the user thread */ 307 new_thr = sos_create_user_thread(NULL, 348 new_thr = sos_create_user_thread(NULL, 308 proc_init, 349 proc_init, 309 start_uaddr 350 start_uaddr, 310 0, 0, 351 0, 0, 311 ustack + SO 352 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, 312 SOS_SCHED_P 353 SOS_SCHED_PRIO_TS_LOWEST); 313 if (! new_thr) 354 if (! new_thr) 314 { 355 { 315 sos_bochs_printf("ici 3\n"); << 316 sos_process_unref(proc_init); 356 sos_process_unref(proc_init); 317 return -SOS_ENOMEM; 357 return -SOS_ENOMEM; 318 } 358 } 319 359 320 sos_process_unref(proc_init); 360 sos_process_unref(proc_init); 321 return SOS_OK; 361 return SOS_OK; 322 } 362 } 323 363 324 364 325 /* =========================================== 365 /* ====================================================================== 326 * The C entry point of our operating system 366 * The C entry point of our operating system 327 */ 367 */ 328 void sos_main(unsigned long magic, unsigned lo !! 368 void sos_main(unsigned long magic, unsigned long arg) 329 { 369 { 330 unsigned i; 370 unsigned i; 331 sos_paddr_t sos_kernel_core_base_paddr, sos_ 371 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 332 struct sos_time tick_resolution; 372 struct sos_time tick_resolution; >> 373 struct sos_fs_manager_instance * rootfs; 333 374 334 /* Grub sends us a structure, called multibo !! 375 /* Size of RAM above 1MB. Might be undefined ! */ 335 precious informations about the system, s !! 376 unsigned long int upper_mem = 0; 336 documentation for more information. */ << 337 multiboot_info_t *mbi; << 338 mbi = (multiboot_info_t *) addr; << 339 377 340 /* Setup bochs and console, and clear the co 378 /* Setup bochs and console, and clear the console */ 341 sos_bochs_setup(); 379 sos_bochs_setup(); 342 380 343 sos_x86_videomem_setup(); 381 sos_x86_videomem_setup(); 344 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 382 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 345 383 346 /* Greetings from SOS */ 384 /* Greetings from SOS */ 347 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 385 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 348 /* Loaded with Grub */ !! 386 { 349 sos_x86_videomem_printf(1, 0, !! 387 /* Grub sends us a structure, called multiboot_info_t with a lot of 350 SOS_X86_VIDEO_FG_Y !! 388 precious informations about the system, see the multiboot 351 "Welcome From GRUB !! 389 documentation for more information. */ 352 "SOS article 7.5", !! 390 multiboot_info_t *mbi = (multiboot_info_t *) arg; 353 (unsigned)(mbi->me !! 391 354 (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 } 355 else 415 else 356 /* Not loaded with grub */ !! 416 /* Not loaded with grub, not from an enhanced bootsect */ 357 sos_x86_videomem_printf(1, 0, 417 sos_x86_videomem_printf(1, 0, 358 SOS_X86_VIDEO_FG_Y 418 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 359 "Welcome to SOS ar !! 419 "Welcome to SOS article 8"); 360 420 361 sos_bochs_putstring("Message in a bochs: Thi !! 421 sos_bochs_putstring("Message in a bochs: This is SOS article 8.\n"); 362 422 363 /* Setup CPU segmentation and IRQ subsystem 423 /* Setup CPU segmentation and IRQ subsystem */ 364 sos_gdt_subsystem_setup(); 424 sos_gdt_subsystem_setup(); 365 sos_idt_subsystem_setup(); 425 sos_idt_subsystem_setup(); 366 426 367 /* Setup SOS IRQs and exceptions subsystem * 427 /* Setup SOS IRQs and exceptions subsystem */ 368 sos_exception_subsystem_setup(); 428 sos_exception_subsystem_setup(); 369 sos_irq_subsystem_setup(); 429 sos_irq_subsystem_setup(); 370 430 371 /* Configure the timer so as to raise the IR 431 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 372 sos_i8254_set_frequency(100); 432 sos_i8254_set_frequency(100); 373 433 374 /* Setup the kernel time subsystem to get pr 434 /* Setup the kernel time subsystem to get prepared to take the timer 375 ticks into account */ 435 ticks into account */ 376 tick_resolution = (struct sos_time) { .sec=0 436 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 377 sos_time_subsysem_setup(& tick_resolution); 437 sos_time_subsysem_setup(& tick_resolution); 378 438 379 /* We need a multiboot-compliant boot loader !! 439 /* We need to know the RAM size */ 380 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) !! 440 if (upper_mem == 0) 381 { 441 { 382 sos_x86_videomem_putstring(20, 0, 442 sos_x86_videomem_putstring(20, 0, 383 SOS_X86_VIDEO 443 SOS_X86_VIDEO_FG_LTRED 384 | SOS_X86_V 444 | SOS_X86_VIDEO_BG_BLUE 385 | SOS_X86_V 445 | SOS_X86_VIDEO_FG_BLINKING, 386 "I'm not load !! 446 "I don't know RAM size ! Load me with Grub..."); 387 /* STOP ! */ 447 /* STOP ! */ 388 for (;;) 448 for (;;) 389 continue; 449 continue; 390 } 450 } 391 451 392 /* 452 /* 393 * Some interrupt handlers 453 * Some interrupt handlers 394 */ 454 */ 395 455 396 /* Binding some HW interrupts and exceptions 456 /* Binding some HW interrupts and exceptions to software routines */ 397 sos_irq_set_routine(SOS_IRQ_TIMER, 457 sos_irq_set_routine(SOS_IRQ_TIMER, 398 clk_it); 458 clk_it); 399 459 400 /* 460 /* 401 * Setup physical memory management 461 * Setup physical memory management 402 */ 462 */ 403 463 404 /* Multiboot says: "The value returned for u !! 464 SOS_ASSERT_FATAL(SOS_OK 405 the address of the first upper memory hol !! 465 == sos_physmem_subsystem_setup((upper_mem<<10) + (1<<20), 406 also adds: "It is not guaranteed to be th !! 466 &sos_kernel_core_base_paddr, 407 sos_physmem_subsystem_setup((mbi->mem_upper< !! 467 &sos_kernel_core_top_paddr)); 408 & sos_kernel_cor << 409 & sos_kernel_cor << 410 468 411 /* 469 /* 412 * Switch to paged-memory mode 470 * Switch to paged-memory mode 413 */ 471 */ 414 472 415 /* Disabling interrupts should seem more cor 473 /* Disabling interrupts should seem more correct, but it's not really 416 necessary at this stage */ 474 necessary at this stage */ 417 SOS_ASSERT_FATAL(SOS_OK == 475 SOS_ASSERT_FATAL(SOS_OK == 418 sos_paging_subsystem_setup( 476 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 419 477 sos_kernel_core_top_paddr)); 420 478 421 /* Bind the page fault exception */ 479 /* Bind the page fault exception */ 422 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 480 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 423 pgflt_ex); 481 pgflt_ex); 424 482 425 /* 483 /* 426 * Setup kernel virtual memory allocator 484 * Setup kernel virtual memory allocator 427 */ 485 */ 428 486 429 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 487 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 430 sos_kernel_ 488 sos_kernel_core_top_paddr, 431 bootstrap_s 489 bootstrap_stack_bottom, 432 bootstrap_s 490 bootstrap_stack_bottom 433 + bootstrap 491 + bootstrap_stack_size)) 434 sos_bochs_printf("Could not setup the Kern 492 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 435 493 436 if (sos_kmalloc_subsystem_setup()) 494 if (sos_kmalloc_subsystem_setup()) 437 sos_bochs_printf("Could not setup the Kmal 495 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 438 496 439 /* 497 /* 440 * Initialize the MMU context subsystem 498 * Initialize the MMU context subsystem 441 */ 499 */ 442 sos_mm_context_subsystem_setup(); 500 sos_mm_context_subsystem_setup(); 443 501 444 /* 502 /* 445 * Initialize the CPU context subsystem 503 * Initialize the CPU context subsystem 446 */ 504 */ 447 sos_cpu_context_subsystem_setup(); 505 sos_cpu_context_subsystem_setup(); 448 506 449 /* 507 /* 450 * Bind the syscall handler to its software 508 * Bind the syscall handler to its software interrupt handler 451 */ 509 */ 452 sos_swintr_subsystem_setup(); 510 sos_swintr_subsystem_setup(); 453 511 454 512 455 /* 513 /* 456 * Initialize the Kernel thread and schedule 514 * Initialize the Kernel thread and scheduler subsystems 457 */ 515 */ 458 516 459 /* Initialize kernel thread subsystem */ 517 /* Initialize kernel thread subsystem */ 460 sos_thread_subsystem_setup(bootstrap_stack_b 518 sos_thread_subsystem_setup(bootstrap_stack_bottom, 461 bootstrap_stack_s 519 bootstrap_stack_size); 462 520 463 /* Initialize the scheduler */ 521 /* Initialize the scheduler */ 464 sos_sched_subsystem_setup(); 522 sos_sched_subsystem_setup(); 465 523 466 /* Declare the IDLE thread */ 524 /* Declare the IDLE thread */ 467 SOS_ASSERT_FATAL(sos_create_kernel_thread("i 525 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, 468 SO 526 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 469 527 470 /* Prepare the stats subsystem */ 528 /* Prepare the stats subsystem */ 471 sos_load_subsystem_setup(); 529 sos_load_subsystem_setup(); 472 530 473 /* Declare a thread that prints some stats * 531 /* Declare a thread that prints some stats */ 474 SOS_ASSERT_FATAL(sos_create_kernel_thread("s 532 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, 475 NU 533 NULL, 476 SO 534 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 477 535 478 536 479 /* 537 /* 480 * Initialise user address space management 538 * Initialise user address space management subsystem 481 */ 539 */ 482 sos_umem_vmm_subsystem_setup(); 540 sos_umem_vmm_subsystem_setup(); 483 sos_dev_zero_subsystem_setup(); 541 sos_dev_zero_subsystem_setup(); 484 542 485 /* 543 /* 486 * Initialize process stuff 544 * Initialize process stuff 487 */ 545 */ 488 sos_process_subsystem_setup(); 546 sos_process_subsystem_setup(); 489 547 490 548 491 /* Enabling the HW interrupts here, this wil 549 /* Enabling the HW interrupts here, this will make the timer HW 492 interrupt call the scheduler */ 550 interrupt call the scheduler */ 493 asm volatile ("sti\n"); 551 asm volatile ("sti\n"); 494 552 >> 553 >> 554 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_subsystem_setup()); >> 555 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_setup(NULL, >> 556 "virtfs", >> 557 NULL, >> 558 & rootfs)); >> 559 >> 560 495 /* Start the 'init' process, which in turns 561 /* Start the 'init' process, which in turns launches the other 496 programs */ 562 programs */ 497 start_init(); !! 563 start_init(rootfs); 498 << 499 /* 564 /* 500 * We can safely exit from this function now 565 * We can safely exit from this function now, for there is already 501 * an idle Kernel thread ready to make the C 566 * an idle Kernel thread ready to make the CPU busy working... 502 * 567 * 503 * However, we must EXPLICITELY call sos_thr 568 * However, we must EXPLICITELY call sos_thread_exit() because a 504 * simple "return" will return nowhere ! Act 569 * simple "return" will return nowhere ! Actually this first thread 505 * was initialized by the Grub bootstrap sta 570 * was initialized by the Grub bootstrap stage, at a time when the 506 * word "thread" did not exist. This means t 571 * word "thread" did not exist. This means that the stack was not 507 * setup in order for a return here to call 572 * setup in order for a return here to call sos_thread_exit() 508 * automagically. Hence we must call it manu 573 * automagically. Hence we must call it manually. This is the ONLY 509 * kernel thread where we must do this manua 574 * kernel thread where we must do this manually. 510 */ 575 */ 511 sos_bochs_printf("Bye from primary thread !\ 576 sos_bochs_printf("Bye from primary thread !\n"); 512 sos_thread_exit(); 577 sos_thread_exit(); 513 SOS_FATAL_ERROR("No trespassing !"); 578 SOS_FATAL_ERROR("No trespassing !"); 514 } 579 }
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