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