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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> >> 038 #include <sos/umem_vmm.h> 036 #include <sos/klibc.h> 039 #include <sos/klibc.h> 037 #include <sos/assert.h> 040 #include <sos/assert.h> 038 #include <drivers/x86_videomem.h> 041 #include <drivers/x86_videomem.h> 039 #include <drivers/bochs.h> 042 #include <drivers/bochs.h> 040 #include <sos/calcload.h> 043 #include <sos/calcload.h> 041 !! 044 #include <sos/umem_vmm.h> >> 045 #include <sos/binfmt_elf32.h> >> 046 #include <drivers/zero.h> >> 047 #include <sos/fs.h> >> 048 #include <drivers/fs_virtfs.h> 042 049 043 /* Helper function to display each bits of a 3 050 /* Helper function to display each bits of a 32bits integer on the 044 screen as dark or light carrets */ 051 screen as dark or light carrets */ 045 void display_bits(unsigned char row, unsigned 052 void display_bits(unsigned char row, unsigned char col, 046 unsigned char attribute, 053 unsigned char attribute, 047 sos_ui32_t integer) 054 sos_ui32_t integer) 048 { 055 { 049 int i; 056 int i; 050 /* Scan each bit of the integer, MSb first * 057 /* Scan each bit of the integer, MSb first */ 051 for (i = 31 ; i >= 0 ; i--) 058 for (i = 31 ; i >= 0 ; i--) 052 { 059 { 053 /* Test if bit i of 'integer' is set */ 060 /* Test if bit i of 'integer' is set */ 054 int bit_i = (integer & (1 << i)); 061 int bit_i = (integer & (1 << i)); 055 /* Ascii 219 => dark carret, Ascii 177 = 062 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 056 unsigned char ascii_code = bit_i?219:177 063 unsigned char ascii_code = bit_i?219:177; 057 sos_x86_videomem_putchar(row, col++, 064 sos_x86_videomem_putchar(row, col++, 058 attribute, 065 attribute, 059 ascii_code); 066 ascii_code); 060 } 067 } 061 } 068 } 062 069 063 << 064 /* Clock IRQ handler */ 070 /* Clock IRQ handler */ 065 static void clk_it(int intid) 071 static void clk_it(int intid) 066 { 072 { 067 static sos_ui32_t clock_count = 0; 073 static sos_ui32_t clock_count = 0; 068 074 069 display_bits(0, 48, 075 display_bits(0, 48, 070 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 076 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 071 clock_count); 077 clock_count); 072 clock_count++; 078 clock_count++; 073 079 074 /* Execute the expired timeout actions (if a 080 /* Execute the expired timeout actions (if any) */ 075 sos_time_do_tick(); 081 sos_time_do_tick(); 076 082 077 /* Update scheduler statistics and status */ 083 /* Update scheduler statistics and status */ 078 sos_sched_do_timer_tick(); 084 sos_sched_do_timer_tick(); 079 } 085 } 080 086 081 087 082 /* =========================================== 088 /* ====================================================================== 083 * Page fault exception handling 089 * Page fault exception handling 084 */ 090 */ 085 091 086 092 087 /* Page fault exception handler with demand pa 093 /* Page fault exception handler with demand paging for the kernel */ 088 static void pgflt_ex(int intid, struct sos_cpu 094 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 089 { 095 { 090 static sos_ui32_t demand_paging_count = 0; 096 static sos_ui32_t demand_paging_count = 0; >> 097 struct sos_thread * cur_thr = sos_thread_get_current(); 091 sos_vaddr_t faulting_vaddr = sos_cpu_contex 098 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 092 sos_paddr_t ppage_paddr; 099 sos_paddr_t ppage_paddr; 093 100 094 if (sos_cpu_context_is_in_user_mode(ctxt)) !! 101 if (sos_cpu_context_is_in_user_mode(ctxt) >> 102 || (cur_thr->fixup_uaccess.return_vaddr)) 095 { 103 { 096 /* User-mode page faults are considered !! 104 __label__ unforce_address_space; 097 moment */ !! 105 sos_bool_t need_to_setup_mmu; >> 106 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); >> 107 >> 108 /* Make sure to always stay in the interrupted thread's MMU >> 109 configuration */ >> 110 need_to_setup_mmu = (cur_thr->squatted_mm_context >> 111 != sos_process_get_mm_context(cur_thr->process)); >> 112 if (need_to_setup_mmu) >> 113 sos_thread_prepare_user_space_access(NULL, 0); >> 114 >> 115 if (SOS_OK == >> 116 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, >> 117 errcode & (1 << 1), >> 118 TRUE)) >> 119 goto unforce_address_space; >> 120 >> 121 /* If the page fault occured in kernel mode, return to kernel to >> 122 the fixup address */ >> 123 if (! sos_cpu_context_is_in_user_mode(ctxt)) >> 124 { >> 125 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; >> 126 sos_cpu_context_set_EX_return_address(ctxt, >> 127 cur_thr->fixup_uaccess.return_vaddr); >> 128 goto unforce_address_space; >> 129 } >> 130 >> 131 if (need_to_setup_mmu) >> 132 sos_thread_end_user_space_access(); >> 133 098 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", 099 sos_cpu_context_get_PC( 135 sos_cpu_context_get_PC(ctxt), 100 (unsigned)faulting_vadd 136 (unsigned)faulting_vaddr, 101 (unsigned)sos_cpu_conte 137 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 102 sos_bochs_printf("Terminating User threa 138 sos_bochs_printf("Terminating User thread\n"); 103 sos_thread_exit(); 139 sos_thread_exit(); >> 140 >> 141 unforce_address_space: >> 142 if (need_to_setup_mmu) >> 143 sos_thread_end_user_space_access(); >> 144 return; 104 } 145 } 105 146 106 /* Check if address is covered by any VMM ra 147 /* Check if address is covered by any VMM range */ 107 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 148 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 108 { 149 { 109 /* No: The page fault is out of any kern 150 /* No: The page fault is out of any kernel virtual region. For 110 the moment, we don't handle this. */ 151 the moment, we don't handle this. */ 111 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)!", 112 sos_cpu_context_ 153 sos_cpu_context_get_PC(ctxt), 113 (unsigned)faulti 154 (unsigned)faulting_vaddr, 114 (unsigned)sos_cp 155 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 115 SOS_ASSERT_FATAL(! "Got page fault (note 156 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 116 } 157 } 117 158 118 159 119 /* 160 /* 120 * Demand paging in kernel space 161 * Demand paging in kernel space 121 */ 162 */ 122 163 123 /* Update the number of demand paging reques 164 /* Update the number of demand paging requests handled */ 124 demand_paging_count ++; 165 demand_paging_count ++; 125 display_bits(0, 0, 166 display_bits(0, 0, 126 SOS_X86_VIDEO_FG_LTRED | SOS_X8 167 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 127 demand_paging_count); 168 demand_paging_count); 128 169 129 /* Allocate a new page for the virtual addre 170 /* Allocate a new page for the virtual address */ 130 ppage_paddr = sos_physmem_ref_physpage_new(F 171 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 131 if (! ppage_paddr) 172 if (! ppage_paddr) 132 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 !)"); 133 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 174 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 134 SO 175 SOS_PAGE_ALIGN_INF(faulting_vaddr), 135 FA 176 FALSE, 136 SO 177 SOS_VM_MAP_PROT_READ 137 | 178 | SOS_VM_MAP_PROT_WRITE 138 | 179 | SOS_VM_MAP_ATOMIC)); 139 sos_physmem_unref_physpage(ppage_paddr); 180 sos_physmem_unref_physpage(ppage_paddr); 140 181 141 /* Ok, we can now return to interrupted cont 182 /* Ok, we can now return to interrupted context */ 142 } 183 } 143 184 144 185 145 /* =========================================== << 146 * Demonstrate the use of SOS kernel threads << 147 * - Kernel Threads are created with various << 148 * state is printed on both the console and << 149 * - For tests regarding threads' synchroniza << 150 */ << 151 << 152 struct thr_arg << 153 { << 154 char character; << 155 int color; << 156 << 157 int col; << 158 int row; << 159 }; << 160 << 161 << 162 static void demo_thread(void *arg) << 163 { << 164 struct thr_arg *thr_arg = (struct thr_arg*)a << 165 int progress = 0; << 166 << 167 sos_bochs_printf("start %c", thr_arg->charac << 168 while (1) << 169 { << 170 progress ++; << 171 display_bits(thr_arg->row, thr_arg->col+ << 172 << 173 sos_bochs_putchar(thr_arg->character); << 174 << 175 /* Yield the CPU to another thread somet << 176 if ((random() % 100) == 0) << 177 { << 178 sos_bochs_printf("[37myield(%c)[m\ << 179 sos_x86_videomem_putchar(thr_arg->ro << 180 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 181 sos_x86_videomem_putchar(thr_arg->ro << 182 } << 183 << 184 /* Go to sleep some other times... */ << 185 else if ((random() % 200) == 0) << 186 { << 187 struct sos_time t = (struct sos_time << 188 sos_bochs_printf("[37msleep1(%c)[m << 189 sos_x86_videomem_putchar(thr_arg->ro << 190 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 191 SOS_ASSERT_FATAL(sos_time_is_zero(& << 192 sos_x86_videomem_putchar(thr_arg->ro << 193 } << 194 << 195 /* Go to sleep for a longer time some ot << 196 else if ((random() % 300) == 0) << 197 { << 198 struct sos_time t = (struct sos_time << 199 sos_bochs_printf("[37msleep2(%c)[m << 200 sos_x86_videomem_putchar(thr_arg->ro << 201 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 202 SOS_ASSERT_FATAL(sos_time_is_zero(& << 203 sos_x86_videomem_putchar(thr_arg->ro << 204 } << 205 << 206 /* Infinite loop otherwise */ << 207 } << 208 } << 209 << 210 << 211 static void test_thread() << 212 { << 213 /* "static" variables because we want them t << 214 function returns */ << 215 static struct thr_arg arg_b, arg_c, arg_d, a << 216 sos_ui32_t flags; << 217 << 218 sos_disable_IRQs(flags); << 219 << 220 arg_b = (struct thr_arg) { .character='b', . << 221 sos_create_kernel_thread("YO[b]", demo_threa << 222 << 223 arg_c = (struct thr_arg) { .character='c', . << 224 sos_create_kernel_thread("YO[c]", demo_threa << 225 << 226 arg_d = (struct thr_arg) { .character='d', . << 227 sos_create_kernel_thread("YO[d]", demo_threa << 228 << 229 arg_e = (struct thr_arg) { .character='e', . << 230 sos_create_kernel_thread("YO[e]", demo_threa << 231 << 232 arg_R = (struct thr_arg) { .character='R', . << 233 sos_create_kernel_thread("YO[R]", demo_threa << 234 << 235 arg_S = (struct thr_arg) { .character='S', . << 236 sos_create_kernel_thread("YO[S]", demo_threa << 237 << 238 sos_restore_IRQs(flags); << 239 } << 240 << 241 186 242 /* =========================================== 187 /* ====================================================================== 243 * An operating system MUST always have a read 188 * An operating system MUST always have a ready thread ! Otherwise: 244 * what would the CPU have to execute ?! 189 * what would the CPU have to execute ?! 245 */ 190 */ 246 static void idle_thread() 191 static void idle_thread() 247 { 192 { 248 sos_ui32_t idle_twiddle = 0; 193 sos_ui32_t idle_twiddle = 0; 249 194 250 while (1) 195 while (1) 251 { 196 { 252 /* Remove this instruction if you get an 197 /* Remove this instruction if you get an "Invalid opcode" CPU 253 exception (old 80386 CPU) */ 198 exception (old 80386 CPU) */ 254 asm("hlt\n"); 199 asm("hlt\n"); 255 200 256 idle_twiddle ++; 201 idle_twiddle ++; 257 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE 202 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 258 idle_twiddle); 203 idle_twiddle); 259 204 260 /* Lend the CPU to some other thread */ 205 /* Lend the CPU to some other thread */ 261 sos_thread_yield(); 206 sos_thread_yield(); 262 } 207 } 263 } 208 } 264 209 265 210 266 /* =========================================== 211 /* ====================================================================== 267 * Kernel thread showing some CPU usage statis 212 * Kernel thread showing some CPU usage statistics on the console every 1s 268 */ 213 */ 269 static void stat_thread() 214 static void stat_thread() 270 { 215 { 271 while (1) 216 while (1) 272 { 217 { 273 sos_ui32_t flags; 218 sos_ui32_t flags; 274 sos_ui32_t load1, load5, load15; 219 sos_ui32_t load1, load5, load15; 275 char str1[11], str5[11], str15[11]; 220 char str1[11], str5[11], str15[11]; 276 struct sos_time t; 221 struct sos_time t; 277 t.sec = 1; 222 t.sec = 1; 278 t.nanosec = 0; 223 t.nanosec = 0; 279 224 280 sos_thread_sleep(& t); 225 sos_thread_sleep(& t); 281 226 282 sos_disable_IRQs(flags); 227 sos_disable_IRQs(flags); 283 228 284 /* The IDLE task is EXcluded in the foll 229 /* The IDLE task is EXcluded in the following computation */ 285 sos_load_get_sload(&load1, &load5, &load 230 sos_load_get_sload(&load1, &load5, &load15); 286 sos_load_to_string(str1, load1); 231 sos_load_to_string(str1, load1); 287 sos_load_to_string(str5, load5); 232 sos_load_to_string(str5, load5); 288 sos_load_to_string(str15, load15); 233 sos_load_to_string(str15, load15); 289 sos_x86_videomem_printf(16, 34, 234 sos_x86_videomem_printf(16, 34, 290 SOS_X86_VIDEO_FG 235 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 291 "Kernel (- Idle) 236 "Kernel (- Idle): %s %s %s ", 292 str1, str5, str1 237 str1, str5, str15); 293 238 294 sos_load_get_uload(&load1, &load5, &load 239 sos_load_get_uload(&load1, &load5, &load15); 295 sos_load_to_string(str1, load1); 240 sos_load_to_string(str1, load1); 296 sos_load_to_string(str5, load5); 241 sos_load_to_string(str5, load5); 297 sos_load_to_string(str15, load15); 242 sos_load_to_string(str15, load15); 298 sos_x86_videomem_printf(17, 34, 243 sos_x86_videomem_printf(17, 34, 299 SOS_X86_VIDEO_FG 244 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 300 "User: %s %s %s 245 "User: %s %s %s ", 301 str1, str5, str1 246 str1, str5, str15); 302 247 303 sos_load_get_uratio(&load1, &load5, &loa 248 sos_load_get_uratio(&load1, &load5, &load15); 304 sos_load_to_string(str1, load1); 249 sos_load_to_string(str1, load1); 305 sos_load_to_string(str5, load5); 250 sos_load_to_string(str5, load5); 306 sos_load_to_string(str15, load15); 251 sos_load_to_string(str15, load15); 307 sos_x86_videomem_printf(18, 34, 252 sos_x86_videomem_printf(18, 34, 308 SOS_X86_VIDEO_FG 253 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 309 "User CPU %%: %s 254 "User CPU %%: %s %s %s ", 310 str1, str5, str1 255 str1, str5, str15); 311 256 312 /* The IDLE task is INcluded in the foll 257 /* The IDLE task is INcluded in the following computation */ 313 sos_load_get_sratio(&load1, &load5, &loa 258 sos_load_get_sratio(&load1, &load5, &load15); 314 sos_load_to_string(str1, load1); 259 sos_load_to_string(str1, load1); 315 sos_load_to_string(str5, load5); 260 sos_load_to_string(str5, load5); 316 sos_load_to_string(str15, load15); 261 sos_load_to_string(str15, load15); 317 sos_x86_videomem_printf(19, 34, 262 sos_x86_videomem_printf(19, 34, 318 SOS_X86_VIDEO_FG 263 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 319 "Kernel CPU %% ( 264 "Kernel CPU %% (+ Idle): %s %s %s ", 320 str1, str5, str1 265 str1, str5, str15); 321 sos_restore_IRQs(flags); 266 sos_restore_IRQs(flags); 322 } 267 } 323 } 268 } 324 269 325 270 326 /* =========================================== 271 /* ====================================================================== >> 272 * Start the "init" (userland) process >> 273 */ >> 274 static sos_ret_t >> 275 start_init(struct sos_fs_manager_instance * rootfs) >> 276 { >> 277 sos_ret_t retval; >> 278 struct sos_umem_vmm_as *as_init; >> 279 struct sos_process *proc_init; >> 280 struct sos_thread *new_thr; >> 281 sos_uaddr_t ustack, start_uaddr; >> 282 struct sos_fs_opened_file * init_root, * init_cwd, * unused_of; >> 283 >> 284 /* Create the new process */ >> 285 proc_init = sos_process_create("init", FALSE); >> 286 if (! proc_init) >> 287 return -SOS_ENOMEM; >> 288 as_init = sos_process_get_address_space(proc_init); >> 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 >> 328 /* Map the 'init' program in user space */ >> 329 start_uaddr = sos_binfmt_elf32_map(as_init, "init"); >> 330 if (0 == start_uaddr) >> 331 { >> 332 sos_process_unref(proc_init); >> 333 return -SOS_ENOENT; >> 334 } >> 335 >> 336 /* Allocate the user stack */ >> 337 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; >> 338 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, >> 339 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, >> 340 /* PRIVATE */ 0); >> 341 if (SOS_OK != retval) >> 342 { >> 343 sos_process_unref(proc_init); >> 344 return -SOS_ENOMEM; >> 345 } >> 346 >> 347 /* Now create the user thread */ >> 348 new_thr = sos_create_user_thread(NULL, >> 349 proc_init, >> 350 start_uaddr, >> 351 0, 0, >> 352 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, >> 353 SOS_SCHED_PRIO_TS_LOWEST); >> 354 if (! new_thr) >> 355 { >> 356 sos_process_unref(proc_init); >> 357 return -SOS_ENOMEM; >> 358 } >> 359 >> 360 sos_process_unref(proc_init); >> 361 return SOS_OK; >> 362 } >> 363 >> 364 >> 365 /* ====================================================================== 327 * The C entry point of our operating system 366 * The C entry point of our operating system 328 */ 367 */ 329 void sos_main(unsigned long magic, unsigned lo !! 368 void sos_main(unsigned long magic, unsigned long arg) 330 { 369 { 331 unsigned i; 370 unsigned i; 332 sos_paddr_t sos_kernel_core_base_paddr, sos_ 371 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 333 struct sos_time tick_resolution; 372 struct sos_time tick_resolution; >> 373 struct sos_fs_manager_instance * rootfs; 334 374 335 /* Grub sends us a structure, called multibo !! 375 /* Size of RAM above 1MB. Might be undefined ! */ 336 precious informations about the system, s !! 376 unsigned long int upper_mem = 0; 337 documentation for more information. */ << 338 multiboot_info_t *mbi; << 339 mbi = (multiboot_info_t *) addr; << 340 377 341 /* Setup bochs and console, and clear the co 378 /* Setup bochs and console, and clear the console */ 342 sos_bochs_setup(); 379 sos_bochs_setup(); 343 380 344 sos_x86_videomem_setup(); 381 sos_x86_videomem_setup(); 345 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 382 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 346 383 347 /* Greetings from SOS */ 384 /* Greetings from SOS */ 348 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 385 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 349 /* Loaded with Grub */ !! 386 { 350 sos_x86_videomem_printf(1, 0, !! 387 /* Grub sends us a structure, called multiboot_info_t with a lot of 351 SOS_X86_VIDEO_FG_Y !! 388 precious informations about the system, see the multiboot 352 "Welcome From GRUB !! 389 documentation for more information. */ 353 "SOS article 7", ' !! 390 multiboot_info_t *mbi = (multiboot_info_t *) arg; 354 (unsigned)(mbi->me !! 391 355 (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 } 356 else 415 else 357 /* Not loaded with grub */ !! 416 /* Not loaded with grub, not from an enhanced bootsect */ 358 sos_x86_videomem_printf(1, 0, 417 sos_x86_videomem_printf(1, 0, 359 SOS_X86_VIDEO_FG_Y 418 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 360 "Welcome to SOS ar !! 419 "Welcome to SOS article 8"); 361 420 362 sos_bochs_putstring("Message in a bochs: Thi !! 421 sos_bochs_putstring("Message in a bochs: This is SOS article 8.\n"); 363 422 364 /* Setup CPU segmentation and IRQ subsystem 423 /* Setup CPU segmentation and IRQ subsystem */ 365 sos_gdt_subsystem_setup(); 424 sos_gdt_subsystem_setup(); 366 sos_idt_subsystem_setup(); 425 sos_idt_subsystem_setup(); 367 426 368 /* Setup SOS IRQs and exceptions subsystem * 427 /* Setup SOS IRQs and exceptions subsystem */ 369 sos_exception_subsystem_setup(); 428 sos_exception_subsystem_setup(); 370 sos_irq_subsystem_setup(); 429 sos_irq_subsystem_setup(); 371 430 372 /* Configure the timer so as to raise the IR 431 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 373 sos_i8254_set_frequency(100); 432 sos_i8254_set_frequency(100); 374 433 375 /* Setup the kernel time subsystem to get pr 434 /* Setup the kernel time subsystem to get prepared to take the timer 376 ticks into account */ 435 ticks into account */ 377 tick_resolution = (struct sos_time) { .sec=0 436 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 378 sos_time_subsysem_setup(& tick_resolution); 437 sos_time_subsysem_setup(& tick_resolution); 379 438 380 /* We need a multiboot-compliant boot loader !! 439 /* We need to know the RAM size */ 381 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) !! 440 if (upper_mem == 0) 382 { 441 { 383 sos_x86_videomem_putstring(20, 0, 442 sos_x86_videomem_putstring(20, 0, 384 SOS_X86_VIDEO 443 SOS_X86_VIDEO_FG_LTRED 385 | SOS_X86_V 444 | SOS_X86_VIDEO_BG_BLUE 386 | SOS_X86_V 445 | SOS_X86_VIDEO_FG_BLINKING, 387 "I'm not load !! 446 "I don't know RAM size ! Load me with Grub..."); 388 /* STOP ! */ 447 /* STOP ! */ 389 for (;;) 448 for (;;) 390 continue; 449 continue; 391 } 450 } 392 451 393 /* 452 /* 394 * Some interrupt handlers 453 * Some interrupt handlers 395 */ 454 */ 396 455 397 /* Binding some HW interrupts and exceptions 456 /* Binding some HW interrupts and exceptions to software routines */ 398 sos_irq_set_routine(SOS_IRQ_TIMER, 457 sos_irq_set_routine(SOS_IRQ_TIMER, 399 clk_it); 458 clk_it); 400 459 401 /* 460 /* 402 * Setup physical memory management 461 * Setup physical memory management 403 */ 462 */ 404 463 405 /* Multiboot says: "The value returned for u !! 464 SOS_ASSERT_FATAL(SOS_OK 406 the address of the first upper memory hol !! 465 == sos_physmem_subsystem_setup((upper_mem<<10) + (1<<20), 407 also adds: "It is not guaranteed to be th !! 466 &sos_kernel_core_base_paddr, 408 sos_physmem_subsystem_setup((mbi->mem_upper< !! 467 &sos_kernel_core_top_paddr)); 409 & sos_kernel_cor << 410 & sos_kernel_cor << 411 468 412 /* 469 /* 413 * Switch to paged-memory mode 470 * Switch to paged-memory mode 414 */ 471 */ 415 472 416 /* Disabling interrupts should seem more cor 473 /* Disabling interrupts should seem more correct, but it's not really 417 necessary at this stage */ 474 necessary at this stage */ 418 SOS_ASSERT_FATAL(SOS_OK == 475 SOS_ASSERT_FATAL(SOS_OK == 419 sos_paging_subsystem_setup( 476 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 420 477 sos_kernel_core_top_paddr)); 421 478 422 /* Bind the page fault exception */ 479 /* Bind the page fault exception */ 423 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 480 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 424 pgflt_ex); 481 pgflt_ex); 425 482 426 /* 483 /* 427 * Setup kernel virtual memory allocator 484 * Setup kernel virtual memory allocator 428 */ 485 */ 429 486 430 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 487 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 431 sos_kernel_ 488 sos_kernel_core_top_paddr, 432 bootstrap_s 489 bootstrap_stack_bottom, 433 bootstrap_s 490 bootstrap_stack_bottom 434 + bootstrap 491 + bootstrap_stack_size)) 435 sos_bochs_printf("Could not setup the Kern 492 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 436 493 437 if (sos_kmalloc_subsystem_setup()) 494 if (sos_kmalloc_subsystem_setup()) 438 sos_bochs_printf("Could not setup the Kmal 495 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 439 496 440 /* 497 /* 441 * Initialize the MMU context subsystem 498 * Initialize the MMU context subsystem 442 */ 499 */ 443 sos_mm_context_subsystem_setup(); 500 sos_mm_context_subsystem_setup(); 444 501 445 /* 502 /* 446 * Initialize the CPU context subsystem 503 * Initialize the CPU context subsystem 447 */ 504 */ 448 sos_cpu_context_subsystem_setup(); 505 sos_cpu_context_subsystem_setup(); 449 506 450 /* 507 /* 451 * Bind the syscall handler to its software 508 * Bind the syscall handler to its software interrupt handler 452 */ 509 */ 453 sos_swintr_subsystem_setup(); 510 sos_swintr_subsystem_setup(); 454 511 455 512 456 /* 513 /* 457 * Initialize the Kernel thread and schedule 514 * Initialize the Kernel thread and scheduler subsystems 458 */ 515 */ 459 516 460 /* Initialize kernel thread subsystem */ 517 /* Initialize kernel thread subsystem */ 461 sos_thread_subsystem_setup(bootstrap_stack_b 518 sos_thread_subsystem_setup(bootstrap_stack_bottom, 462 bootstrap_stack_s 519 bootstrap_stack_size); 463 520 464 /* Initialize the scheduler */ 521 /* Initialize the scheduler */ 465 sos_sched_subsystem_setup(); 522 sos_sched_subsystem_setup(); 466 523 467 /* Declare the IDLE thread */ 524 /* Declare the IDLE thread */ 468 SOS_ASSERT_FATAL(sos_create_kernel_thread("i 525 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, 469 SO 526 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 470 527 471 /* Prepare the stats subsystem */ 528 /* Prepare the stats subsystem */ 472 sos_load_subsystem_setup(); 529 sos_load_subsystem_setup(); 473 530 474 /* Declare a thread that prints some stats * 531 /* Declare a thread that prints some stats */ 475 SOS_ASSERT_FATAL(sos_create_kernel_thread("s 532 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, 476 NU 533 NULL, 477 SO 534 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 478 535 479 536 480 /* 537 /* >> 538 * Initialise user address space management subsystem >> 539 */ >> 540 sos_umem_vmm_subsystem_setup(); >> 541 sos_dev_zero_subsystem_setup(); >> 542 >> 543 /* 481 * Initialize process stuff 544 * Initialize process stuff 482 */ 545 */ 483 sos_process_subsystem_setup(); 546 sos_process_subsystem_setup(); 484 547 485 548 486 /* Enabling the HW interrupts here, this wil 549 /* Enabling the HW interrupts here, this will make the timer HW 487 interrupt call the scheduler */ 550 interrupt call the scheduler */ 488 asm volatile ("sti\n"); 551 asm volatile ("sti\n"); 489 552 490 /* Run some tests involving USER processes a << 491 extern void test_art7(); << 492 test_art7(); << 493 << 494 /* Now run some Kernel threads just for fun << 495 extern void MouseSim(); << 496 MouseSim(); << 497 test_thread(); << 498 553 >> 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 >> 561 /* Start the 'init' process, which in turns launches the other >> 562 programs */ >> 563 start_init(rootfs); 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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