Navigation
- Accueil
- Présentation :
- FAQ
- Bugs et errata
- Contributions de lecteurs
- Téléchargements
- LXR (référencement des sources)
- Mailing-list
- Liens et Projets reliés
Site hébergé par :
Site hébergé par :
|
[ source navigation ] [ diff markup ] [ identifier search ] [ general search ] |
|||
|
||||
001 /* Copyright (C) 2004 The SOS Team 001 /* Copyright (C) 2004 The SOS Team 002 002 003 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 007 007 008 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 011 GNU General Public License for more details. 012 012 013 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 016 USA. 017 */ 017 */ 018 018 019 #include <sos/errno.h> << 020 << 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 #include <sos/blkdev.h> << 055 #include <sos/fs_pagecache.h> << 056 #include <drivers/ide.h> << 057 046 058 /* Helper function to display each bits of a 3 047 /* Helper function to display each bits of a 32bits integer on the 059 screen as dark or light carrets */ 048 screen as dark or light carrets */ 060 void display_bits(unsigned char row, unsigned 049 void display_bits(unsigned char row, unsigned char col, 061 unsigned char attribute, 050 unsigned char attribute, 062 sos_ui32_t integer) 051 sos_ui32_t integer) 063 { 052 { 064 int i; 053 int i; 065 /* Scan each bit of the integer, MSb first * 054 /* Scan each bit of the integer, MSb first */ 066 for (i = 31 ; i >= 0 ; i--) 055 for (i = 31 ; i >= 0 ; i--) 067 { 056 { 068 /* Test if bit i of 'integer' is set */ 057 /* Test if bit i of 'integer' is set */ 069 int bit_i = (integer & (1 << i)); 058 int bit_i = (integer & (1 << i)); 070 /* Ascii 219 => dark carret, Ascii 177 = 059 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 071 unsigned char ascii_code = bit_i?219:177 060 unsigned char ascii_code = bit_i?219:177; 072 sos_x86_videomem_putchar(row, col++, 061 sos_x86_videomem_putchar(row, col++, 073 attribute, 062 attribute, 074 ascii_code); 063 ascii_code); 075 } 064 } 076 } 065 } 077 066 >> 067 078 /* Clock IRQ handler */ 068 /* Clock IRQ handler */ 079 static void clk_it(int intid) 069 static void clk_it(int intid) 080 { 070 { 081 static sos_ui32_t clock_count = 0; 071 static sos_ui32_t clock_count = 0; 082 072 083 display_bits(0, 48, 073 display_bits(0, 48, 084 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 074 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 085 clock_count); 075 clock_count); 086 clock_count++; 076 clock_count++; 087 077 088 /* Execute the expired timeout actions (if a 078 /* Execute the expired timeout actions (if any) */ 089 sos_time_do_tick(); 079 sos_time_do_tick(); 090 080 091 /* Update scheduler statistics and status */ 081 /* Update scheduler statistics and status */ 092 sos_sched_do_timer_tick(); 082 sos_sched_do_timer_tick(); 093 } 083 } 094 084 095 085 096 /* =========================================== 086 /* ====================================================================== 097 * Page fault exception handling 087 * Page fault exception handling 098 */ 088 */ 099 089 100 090 101 /* Page fault exception handler with demand pa 091 /* Page fault exception handler with demand paging for the kernel */ 102 static void pgflt_ex(int intid, struct sos_cpu 092 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 103 { 093 { 104 static sos_ui32_t demand_paging_count = 0; 094 static sos_ui32_t demand_paging_count = 0; 105 struct sos_thread * cur_thr = sos_thread_get 095 struct sos_thread * cur_thr = sos_thread_get_current(); 106 sos_vaddr_t faulting_vaddr = sos_cpu_contex 096 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 107 sos_paddr_t ppage_paddr; 097 sos_paddr_t ppage_paddr; 108 098 109 if (sos_cpu_context_is_in_user_mode(ctxt) 099 if (sos_cpu_context_is_in_user_mode(ctxt) 110 || (cur_thr->fixup_uaccess.return_vaddr) 100 || (cur_thr->fixup_uaccess.return_vaddr)) 111 { 101 { 112 __label__ unforce_address_space; 102 __label__ unforce_address_space; 113 sos_bool_t need_to_setup_mmu; 103 sos_bool_t need_to_setup_mmu; 114 sos_ui32_t errcode = sos_cpu_context_get 104 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); 115 105 116 /* Make sure to always stay in the inter 106 /* Make sure to always stay in the interrupted thread's MMU 117 configuration */ 107 configuration */ 118 need_to_setup_mmu = (cur_thr->squatted_m 108 need_to_setup_mmu = (cur_thr->squatted_mm_context 119 != sos_process_get_ 109 != sos_process_get_mm_context(cur_thr->process)); 120 if (need_to_setup_mmu) 110 if (need_to_setup_mmu) 121 sos_thread_prepare_user_space_access(N 111 sos_thread_prepare_user_space_access(NULL, 0); 122 112 123 if (SOS_OK == 113 if (SOS_OK == 124 sos_umem_vmm_try_resolve_page_fault( 114 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, 125 115 errcode & (1 << 1), 126 116 TRUE)) 127 goto unforce_address_space; 117 goto unforce_address_space; 128 118 129 /* If the page fault occured in kernel m 119 /* If the page fault occured in kernel mode, return to kernel to 130 the fixup address */ 120 the fixup address */ 131 if (! sos_cpu_context_is_in_user_mode(ct 121 if (! sos_cpu_context_is_in_user_mode(ctxt)) 132 { 122 { 133 cur_thr->fixup_uaccess.faulted_uaddr 123 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; 134 sos_cpu_context_set_EX_return_addres 124 sos_cpu_context_set_EX_return_address(ctxt, 135 125 cur_thr->fixup_uaccess.return_vaddr); 136 goto unforce_address_space; 126 goto unforce_address_space; 137 } 127 } 138 128 139 if (need_to_setup_mmu) 129 if (need_to_setup_mmu) 140 sos_thread_end_user_space_access(); 130 sos_thread_end_user_space_access(); 141 131 142 sos_bochs_printf("\e[35mTHR %p: Unresolv !! 132 sos_bochs_printf("Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\n", 143 (void*)sos_thread_get_c << 144 sos_cpu_context_get_PC( 133 sos_cpu_context_get_PC(ctxt), 145 (unsigned)faulting_vadd 134 (unsigned)faulting_vaddr, 146 (unsigned)sos_cpu_conte 135 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 147 sos_bochs_printf("Terminating User threa 136 sos_bochs_printf("Terminating User thread\n"); 148 sos_thread_exit(); 137 sos_thread_exit(); 149 138 150 unforce_address_space: 139 unforce_address_space: 151 if (need_to_setup_mmu) 140 if (need_to_setup_mmu) 152 sos_thread_end_user_space_access(); 141 sos_thread_end_user_space_access(); 153 return; 142 return; 154 } 143 } 155 144 156 /* Check if address is covered by any VMM ra 145 /* Check if address is covered by any VMM range */ 157 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 146 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 158 { 147 { 159 /* No: The page fault is out of any kern 148 /* No: The page fault is out of any kernel virtual region. For 160 the moment, we don't handle this. */ 149 the moment, we don't handle this. */ 161 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)!", 162 sos_cpu_context_ 151 sos_cpu_context_get_PC(ctxt), 163 (unsigned)faulti 152 (unsigned)faulting_vaddr, 164 (unsigned)sos_cp 153 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 165 SOS_ASSERT_FATAL(! "Got page fault (note 154 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 166 } 155 } 167 156 168 157 169 /* 158 /* 170 * Demand paging in kernel space 159 * Demand paging in kernel space 171 */ 160 */ 172 161 173 /* Update the number of demand paging reques 162 /* Update the number of demand paging requests handled */ 174 demand_paging_count ++; 163 demand_paging_count ++; 175 display_bits(0, 0, 164 display_bits(0, 0, 176 SOS_X86_VIDEO_FG_LTRED | SOS_X8 165 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 177 demand_paging_count); 166 demand_paging_count); 178 167 179 /* Allocate a new page for the virtual addre 168 /* Allocate a new page for the virtual address */ 180 ppage_paddr = sos_physmem_ref_physpage_new(F 169 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 181 if (! ppage_paddr) 170 if (! ppage_paddr) 182 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 !)"); 183 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 172 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 184 SO 173 SOS_PAGE_ALIGN_INF(faulting_vaddr), 185 FA 174 FALSE, 186 SO 175 SOS_VM_MAP_PROT_READ 187 | 176 | SOS_VM_MAP_PROT_WRITE 188 | 177 | SOS_VM_MAP_ATOMIC)); 189 sos_physmem_unref_physpage(ppage_paddr); 178 sos_physmem_unref_physpage(ppage_paddr); 190 179 191 /* Ok, we can now return to interrupted cont 180 /* Ok, we can now return to interrupted context */ 192 } 181 } 193 182 194 183 195 184 196 /* =========================================== 185 /* ====================================================================== 197 * An operating system MUST always have a read 186 * An operating system MUST always have a ready thread ! Otherwise: 198 * what would the CPU have to execute ?! 187 * what would the CPU have to execute ?! 199 */ 188 */ 200 static void idle_thread(void* unused) __attrib !! 189 static void idle_thread() 201 static void idle_thread(void* unused) << 202 { 190 { 203 sos_ui32_t idle_twiddle = 0; 191 sos_ui32_t idle_twiddle = 0; 204 192 205 while (1) 193 while (1) 206 { 194 { 207 /* Remove this instruction if you get an 195 /* Remove this instruction if you get an "Invalid opcode" CPU 208 exception (old 80386 CPU) */ 196 exception (old 80386 CPU) */ 209 asm("hlt\n"); 197 asm("hlt\n"); 210 198 211 idle_twiddle ++; 199 idle_twiddle ++; 212 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE 200 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 213 idle_twiddle); 201 idle_twiddle); 214 202 215 /* Lend the CPU to some other thread */ 203 /* Lend the CPU to some other thread */ 216 sos_thread_yield(); 204 sos_thread_yield(); 217 } 205 } 218 } 206 } 219 207 220 208 221 /* =========================================== 209 /* ====================================================================== 222 * Kernel thread showing some CPU usage statis 210 * Kernel thread showing some CPU usage statistics on the console every 1s 223 */ 211 */ 224 #define LOAD_DISPLAY_BASELINE 4 !! 212 static void stat_thread() 225 #define LOAD_DISPLAY_STARTROW 34 << 226 static void stat_thread(void * unused) __attri << 227 static void stat_thread(void * unused) << 228 { 213 { 229 while (1) 214 while (1) 230 { 215 { 231 sos_ui32_t flags; 216 sos_ui32_t flags; 232 sos_ui32_t load1, load5, load15; 217 sos_ui32_t load1, load5, load15; 233 char str1[11], str5[11], str15[11]; 218 char str1[11], str5[11], str15[11]; 234 struct sos_time t; 219 struct sos_time t; 235 t.sec = 1; 220 t.sec = 1; 236 t.nanosec = 0; 221 t.nanosec = 0; 237 222 238 sos_thread_sleep(& t); 223 sos_thread_sleep(& t); 239 224 240 sos_disable_IRQs(flags); 225 sos_disable_IRQs(flags); 241 226 242 /* The IDLE task is EXcluded in the foll 227 /* The IDLE task is EXcluded in the following computation */ 243 sos_load_get_sload(&load1, &load5, &load 228 sos_load_get_sload(&load1, &load5, &load15); 244 sos_load_to_string(str1, load1); 229 sos_load_to_string(str1, load1); 245 sos_load_to_string(str5, load5); 230 sos_load_to_string(str5, load5); 246 sos_load_to_string(str15, load15); 231 sos_load_to_string(str15, load15); 247 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 232 sos_x86_videomem_printf(16, 34, 248 SOS_X86_VIDEO_FG 233 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 249 "Kernel (- Idle) 234 "Kernel (- Idle): %s %s %s ", 250 str1, str5, str1 235 str1, str5, str15); 251 236 252 sos_load_get_uload(&load1, &load5, &load 237 sos_load_get_uload(&load1, &load5, &load15); 253 sos_load_to_string(str1, load1); 238 sos_load_to_string(str1, load1); 254 sos_load_to_string(str5, load5); 239 sos_load_to_string(str5, load5); 255 sos_load_to_string(str15, load15); 240 sos_load_to_string(str15, load15); 256 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 241 sos_x86_videomem_printf(17, 34, 257 SOS_X86_VIDEO_FG 242 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 258 "User: %s %s %s 243 "User: %s %s %s ", 259 str1, str5, str1 244 str1, str5, str15); 260 245 261 sos_load_get_uratio(&load1, &load5, &loa 246 sos_load_get_uratio(&load1, &load5, &load15); 262 sos_load_to_string(str1, load1); 247 sos_load_to_string(str1, load1); 263 sos_load_to_string(str5, load5); 248 sos_load_to_string(str5, load5); 264 sos_load_to_string(str15, load15); 249 sos_load_to_string(str15, load15); 265 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 250 sos_x86_videomem_printf(18, 34, 266 SOS_X86_VIDEO_FG 251 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 267 "User CPU %%: %s 252 "User CPU %%: %s %s %s ", 268 str1, str5, str1 253 str1, str5, str15); 269 254 270 /* The IDLE task is INcluded in the foll 255 /* The IDLE task is INcluded in the following computation */ 271 sos_load_get_sratio(&load1, &load5, &loa 256 sos_load_get_sratio(&load1, &load5, &load15); 272 sos_load_to_string(str1, load1); 257 sos_load_to_string(str1, load1); 273 sos_load_to_string(str5, load5); 258 sos_load_to_string(str5, load5); 274 sos_load_to_string(str15, load15); 259 sos_load_to_string(str15, load15); 275 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 260 sos_x86_videomem_printf(19, 34, 276 SOS_X86_VIDEO_FG 261 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 277 "Kernel CPU %% ( 262 "Kernel CPU %% (+ Idle): %s %s %s ", 278 str1, str5, str1 263 str1, str5, str15); 279 sos_restore_IRQs(flags); 264 sos_restore_IRQs(flags); 280 } 265 } 281 } 266 } 282 267 283 268 284 /* =========================================== 269 /* ====================================================================== 285 * Start the "init" (userland) process 270 * Start the "init" (userland) process 286 */ 271 */ 287 static sos_ret_t !! 272 static sos_ret_t start_init() 288 start_init(struct sos_fs_manager_instance * ro << 289 { 273 { 290 sos_ret_t retval; 274 sos_ret_t retval; 291 struct sos_umem_vmm_as *as_init; 275 struct sos_umem_vmm_as *as_init; 292 struct sos_process *proc_init; 276 struct sos_process *proc_init; 293 struct sos_thread *new_thr; 277 struct sos_thread *new_thr; 294 sos_uaddr_t ustack, start_uaddr; 278 sos_uaddr_t ustack, start_uaddr; 295 struct sos_fs_opened_file * init_root, * ini << 296 279 297 /* Create the new process */ 280 /* Create the new process */ 298 proc_init = sos_process_create("init", FALSE 281 proc_init = sos_process_create("init", FALSE); 299 if (! proc_init) 282 if (! proc_init) 300 return -SOS_ENOMEM; 283 return -SOS_ENOMEM; 301 as_init = sos_process_get_address_space(proc 284 as_init = sos_process_get_address_space(proc_init); 302 285 303 << 304 /* << 305 * Setup the root and CWD directories of the << 306 * this process will correspond to the "glob << 307 * system since all the future processes wil << 308 */ << 309 retval = sos_fs_new_opened_file(proc_init, r << 310 SOS_FS_OPEN_ << 311 & init_root) << 312 if (SOS_OK != retval) << 313 { << 314 sos_process_unref(proc_init); << 315 return -SOS_ENOENT; << 316 } << 317 << 318 /* Duplicate the root file to set the curren << 319 the init process */ << 320 retval = sos_fs_duplicate_opened_file(init_r << 321 & init << 322 if (SOS_OK != retval) << 323 { << 324 sos_fs_close(init_root); << 325 sos_process_unref(proc_init); << 326 return -SOS_ENOENT; << 327 } << 328 << 329 /* Now update the process ! */ << 330 if ( ( SOS_OK != sos_process_chroot(proc_ini << 331 || ( SOS_OK != sos_process_chdir(proc_i << 332 { << 333 sos_fs_close(init_root); << 334 sos_fs_close(init_cwd); << 335 sos_process_chroot(proc_init, NULL, & un << 336 sos_process_chdir(proc_init, NULL, & unu << 337 sos_process_unref(proc_init); << 338 return -SOS_ENOENT; << 339 } << 340 << 341 << 342 << 343 /* Map the 'init' program in user space */ 286 /* Map the 'init' program in user space */ 344 start_uaddr = sos_binfmt_elf32_map(as_init, 287 start_uaddr = sos_binfmt_elf32_map(as_init, "init"); 345 if (0 == start_uaddr) 288 if (0 == start_uaddr) 346 { 289 { 347 sos_process_unref(proc_init); 290 sos_process_unref(proc_init); 348 return -SOS_ENOENT; 291 return -SOS_ENOENT; 349 } 292 } 350 !! 293 351 /* Allocate the user stack */ 294 /* Allocate the user stack */ 352 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ 295 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; 353 retval = sos_dev_zero_map(as_init, &ustack, 296 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, 354 SOS_VM_MAP_PROT_RE 297 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, 355 /* PRIVATE */ 0); 298 /* PRIVATE */ 0); 356 if (SOS_OK != retval) 299 if (SOS_OK != retval) 357 { 300 { >> 301 sos_bochs_printf("ici 2\n"); 358 sos_process_unref(proc_init); 302 sos_process_unref(proc_init); 359 return -SOS_ENOMEM; 303 return -SOS_ENOMEM; 360 } 304 } 361 305 362 /* Now create the user thread */ 306 /* Now create the user thread */ 363 new_thr = sos_create_user_thread(NULL, 307 new_thr = sos_create_user_thread(NULL, 364 proc_init, 308 proc_init, 365 start_uaddr 309 start_uaddr, 366 0, 0, 310 0, 0, 367 ustack + SO 311 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, 368 SOS_SCHED_P 312 SOS_SCHED_PRIO_TS_LOWEST); 369 if (! new_thr) 313 if (! new_thr) 370 { 314 { >> 315 sos_bochs_printf("ici 3\n"); 371 sos_process_unref(proc_init); 316 sos_process_unref(proc_init); 372 return -SOS_ENOMEM; 317 return -SOS_ENOMEM; 373 } 318 } 374 319 375 sos_process_unref(proc_init); 320 sos_process_unref(proc_init); 376 return SOS_OK; 321 return SOS_OK; 377 } 322 } 378 323 379 324 380 << 381 /* =========================================== 325 /* ====================================================================== 382 * The C entry point of our operating system 326 * The C entry point of our operating system 383 */ 327 */ 384 void sos_main(unsigned long magic, unsigned lo !! 328 void sos_main(unsigned long magic, unsigned long addr) 385 __attribute__((noreturn)); << 386 void sos_main(unsigned long magic, unsigned lo << 387 { 329 { >> 330 unsigned i; 388 sos_paddr_t sos_kernel_core_base_paddr, sos_ 331 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 389 struct sos_time tick_resolution; 332 struct sos_time tick_resolution; 390 struct sos_fs_manager_instance * rootfs; << 391 333 392 /* Size of RAM above 1MB. Might be undefined !! 334 /* Grub sends us a structure, called multiboot_info_t with a lot of 393 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; 394 339 395 /* Setup bochs and console, and clear the co 340 /* Setup bochs and console, and clear the console */ 396 sos_bochs_subsystem_setup(); !! 341 sos_bochs_setup(); 397 342 398 sos_x86_videomem_setup(); 343 sos_x86_videomem_setup(); 399 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 344 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 400 345 401 /* Greetings from SOS */ 346 /* Greetings from SOS */ 402 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 347 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 403 { !! 348 /* Loaded with Grub */ 404 /* Grub sends us a structure, called mul !! 349 sos_x86_videomem_printf(1, 0, 405 precious informations about the syste !! 350 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 406 documentation for more information. * !! 351 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 407 multiboot_info_t *mbi = (multiboot_info_ !! 352 "SOS article 7.5", ',', 408 !! 353 (unsigned)(mbi->mem_upper >> 10) + 1, 409 /* Multiboot says: "The value returned f !! 354 (unsigned)mbi->mem_upper); 410 maximally the address of the first up << 411 megabyte.". It also adds: "It is not << 412 value." aka "YMMV" ;) */ << 413 upper_mem = mbi->mem_upper; << 414 sos_x86_videomem_printf(1, 0, << 415 SOS_X86_VIDEO_FG << 416 "Welcome From GR << 417 "SOS article 9.5 << 418 (unsigned)(upper << 419 (unsigned)upper_ << 420 } << 421 else if (magic == 0x42244224) << 422 { << 423 /* Loaded with SOS bootsect */ << 424 upper_mem = arg; << 425 sos_x86_videomem_printf(1, 0, << 426 SOS_X86_VIDEO_FG << 427 "Welcome to %s%c << 428 "SOS article 9.5 << 429 (unsigned)(upper << 430 (unsigned)upper_ << 431 } << 432 else 355 else 433 /* Not loaded with grub, not from an enhan !! 356 /* Not loaded with grub */ 434 sos_x86_videomem_printf(1, 0, 357 sos_x86_videomem_printf(1, 0, 435 SOS_X86_VIDEO_FG_Y 358 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 436 "Welcome to SOS ar !! 359 "Welcome to SOS article 7.5"); 437 360 438 sos_bochs_putstring("Message in a bochs: Thi !! 361 sos_bochs_putstring("Message in a bochs: This is SOS article 7.5.\n"); 439 362 440 /* Setup CPU segmentation and IRQ subsystem 363 /* Setup CPU segmentation and IRQ subsystem */ 441 sos_gdt_subsystem_setup(); 364 sos_gdt_subsystem_setup(); 442 sos_idt_subsystem_setup(); 365 sos_idt_subsystem_setup(); 443 366 444 /* Setup SOS IRQs and exceptions subsystem * 367 /* Setup SOS IRQs and exceptions subsystem */ 445 sos_exception_subsystem_setup(); 368 sos_exception_subsystem_setup(); 446 sos_irq_subsystem_setup(); 369 sos_irq_subsystem_setup(); 447 370 448 /* Configure the timer so as to raise the IR 371 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 449 sos_i8254_set_frequency(100); 372 sos_i8254_set_frequency(100); 450 373 451 /* Setup the kernel time subsystem to get pr 374 /* Setup the kernel time subsystem to get prepared to take the timer 452 ticks into account */ 375 ticks into account */ 453 tick_resolution = (struct sos_time) { .sec=0 376 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 454 sos_time_subsysem_setup(& tick_resolution); 377 sos_time_subsysem_setup(& tick_resolution); 455 378 456 /* We need to know the RAM size */ !! 379 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 457 if (upper_mem == 0) !! 380 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 458 { 381 { 459 sos_x86_videomem_putstring(20, 0, 382 sos_x86_videomem_putstring(20, 0, 460 SOS_X86_VIDEO 383 SOS_X86_VIDEO_FG_LTRED 461 | SOS_X86_V 384 | SOS_X86_VIDEO_BG_BLUE 462 | SOS_X86_V 385 | SOS_X86_VIDEO_FG_BLINKING, 463 "I don't know !! 386 "I'm not loaded with Grub !"); 464 /* STOP ! */ 387 /* STOP ! */ 465 for (;;) 388 for (;;) 466 continue; 389 continue; 467 } 390 } 468 391 469 /* 392 /* 470 * Some interrupt handlers 393 * Some interrupt handlers 471 */ 394 */ 472 395 473 /* Binding some HW interrupts and exceptions 396 /* Binding some HW interrupts and exceptions to software routines */ 474 sos_irq_set_routine(SOS_IRQ_TIMER, 397 sos_irq_set_routine(SOS_IRQ_TIMER, 475 clk_it); 398 clk_it); 476 399 477 /* 400 /* 478 * Setup physical memory management 401 * Setup physical memory management 479 */ 402 */ 480 403 481 SOS_ASSERT_FATAL(SOS_OK !! 404 /* Multiboot says: "The value returned for upper memory is maximally 482 == sos_physmem_subsystem_se !! 405 the address of the first upper memory hole minus 1 megabyte.". It 483 !! 406 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 484 !! 407 sos_physmem_subsystem_setup((mbi->mem_upper<<10) + (1<<20), >> 408 & sos_kernel_core_base_paddr, >> 409 & sos_kernel_core_top_paddr); 485 410 486 /* 411 /* 487 * Switch to paged-memory mode 412 * Switch to paged-memory mode 488 */ 413 */ 489 414 490 /* Disabling interrupts should seem more cor 415 /* Disabling interrupts should seem more correct, but it's not really 491 necessary at this stage */ 416 necessary at this stage */ 492 SOS_ASSERT_FATAL(SOS_OK == 417 SOS_ASSERT_FATAL(SOS_OK == 493 sos_paging_subsystem_setup( 418 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 494 419 sos_kernel_core_top_paddr)); 495 420 496 /* Bind the page fault exception */ 421 /* Bind the page fault exception */ 497 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 422 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 498 pgflt_ex); 423 pgflt_ex); 499 424 500 /* 425 /* 501 * Setup kernel virtual memory allocator 426 * Setup kernel virtual memory allocator 502 */ 427 */ 503 428 504 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 429 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 505 sos_kernel_ 430 sos_kernel_core_top_paddr, 506 bootstrap_s 431 bootstrap_stack_bottom, 507 bootstrap_s 432 bootstrap_stack_bottom 508 + bootstrap 433 + bootstrap_stack_size)) 509 sos_bochs_printf("Could not setup the Kern 434 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 510 435 511 if (sos_kmalloc_subsystem_setup()) 436 if (sos_kmalloc_subsystem_setup()) 512 sos_bochs_printf("Could not setup the Kmal 437 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 513 438 514 /* 439 /* 515 * Initialize the MMU context subsystem 440 * Initialize the MMU context subsystem 516 */ 441 */ 517 sos_mm_context_subsystem_setup(); 442 sos_mm_context_subsystem_setup(); 518 443 519 /* 444 /* 520 * Initialize the CPU context subsystem 445 * Initialize the CPU context subsystem 521 */ 446 */ 522 sos_cpu_context_subsystem_setup(); 447 sos_cpu_context_subsystem_setup(); 523 448 524 /* 449 /* 525 * Bind the syscall handler to its software 450 * Bind the syscall handler to its software interrupt handler 526 */ 451 */ 527 sos_swintr_subsystem_setup(); 452 sos_swintr_subsystem_setup(); 528 453 529 454 530 /* 455 /* 531 * Initialize the Kernel thread and schedule 456 * Initialize the Kernel thread and scheduler subsystems 532 */ 457 */ 533 458 534 /* Initialize kernel thread subsystem */ 459 /* Initialize kernel thread subsystem */ 535 sos_thread_subsystem_setup(bootstrap_stack_b 460 sos_thread_subsystem_setup(bootstrap_stack_bottom, 536 bootstrap_stack_s 461 bootstrap_stack_size); 537 462 538 /* Initialize the scheduler */ 463 /* Initialize the scheduler */ 539 sos_sched_subsystem_setup(); 464 sos_sched_subsystem_setup(); 540 465 541 /* Declare the IDLE thread */ 466 /* Declare the IDLE thread */ 542 SOS_ASSERT_FATAL(sos_create_kernel_thread("i 467 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, 543 SO 468 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 544 469 545 /* Prepare the stats subsystem */ 470 /* Prepare the stats subsystem */ 546 sos_load_subsystem_setup(); 471 sos_load_subsystem_setup(); 547 472 548 /* Declare a thread that prints some stats * 473 /* Declare a thread that prints some stats */ 549 SOS_ASSERT_FATAL(sos_create_kernel_thread("s 474 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, 550 NU 475 NULL, 551 SO 476 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 552 477 553 478 554 /* 479 /* 555 * Initialise user address space management 480 * Initialise user address space management subsystem 556 */ 481 */ 557 sos_umem_vmm_subsystem_setup(); 482 sos_umem_vmm_subsystem_setup(); 558 sos_dev_zero_subsystem_setup(); 483 sos_dev_zero_subsystem_setup(); 559 << 560 /* Initialize the page and block cache subsy << 561 sos_fs_pagecache_subsystem_setup(); << 562 sos_blockdev_subsystem_setup(); << 563 sos_dev_mem_chardev_setup(); << 564 484 565 /* 485 /* 566 * Initialize process stuff 486 * Initialize process stuff 567 */ 487 */ 568 sos_process_subsystem_setup(); 488 sos_process_subsystem_setup(); 569 489 570 490 571 /* Enabling the HW interrupts here, this wil 491 /* Enabling the HW interrupts here, this will make the timer HW 572 interrupt call the scheduler */ 492 interrupt call the scheduler */ 573 asm volatile ("sti\n"); 493 asm volatile ("sti\n"); 574 494 575 << 576 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_sub << 577 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_ << 578 << 579 << 580 << 581 << 582 << 583 tty_subsystem_setup(); << 584 sos_ttyS0_subsystem_setup(); << 585 sos_console_subsystem_setup(); << 586 << 587 << 588 sos_ide_subsystem_setup(); << 589 << 590 << 591 << 592 /* Start the 'init' process, which in turns 495 /* Start the 'init' process, which in turns launches the other 593 programs */ 496 programs */ 594 start_init(rootfs); !! 497 start_init(); >> 498 595 /* 499 /* 596 * We can safely exit from this function now 500 * We can safely exit from this function now, for there is already 597 * an idle Kernel thread ready to make the C 501 * an idle Kernel thread ready to make the CPU busy working... 598 * 502 * 599 * However, we must EXPLICITELY call sos_thr 503 * However, we must EXPLICITELY call sos_thread_exit() because a 600 * simple "return" will return nowhere ! Act 504 * simple "return" will return nowhere ! Actually this first thread 601 * was initialized by the Grub bootstrap sta 505 * was initialized by the Grub bootstrap stage, at a time when the 602 * word "thread" did not exist. This means t 506 * word "thread" did not exist. This means that the stack was not 603 * setup in order for a return here to call 507 * setup in order for a return here to call sos_thread_exit() 604 * automagically. Hence we must call it manu 508 * automagically. Hence we must call it manually. This is the ONLY 605 * kernel thread where we must do this manua 509 * kernel thread where we must do this manually. 606 */ 510 */ 607 sos_bochs_printf("Bye from primary thread !\ 511 sos_bochs_printf("Bye from primary thread !\n"); 608 sos_thread_exit(); 512 sos_thread_exit(); 609 SOS_FATAL_ERROR("No trespassing !"); 513 SOS_FATAL_ERROR("No trespassing !"); 610 } 514 }
| [ source navigation ] | [ diff markup ] | [ identifier search ] | [ general search ] |