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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> >> 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> 042 054 043 /* Helper function to display each bits of a 3 055 /* Helper function to display each bits of a 32bits integer on the 044 screen as dark or light carrets */ 056 screen as dark or light carrets */ 045 void display_bits(unsigned char row, unsigned 057 void display_bits(unsigned char row, unsigned char col, 046 unsigned char attribute, 058 unsigned char attribute, 047 sos_ui32_t integer) 059 sos_ui32_t integer) 048 { 060 { 049 int i; 061 int i; 050 /* Scan each bit of the integer, MSb first * 062 /* Scan each bit of the integer, MSb first */ 051 for (i = 31 ; i >= 0 ; i--) 063 for (i = 31 ; i >= 0 ; i--) 052 { 064 { 053 /* Test if bit i of 'integer' is set */ 065 /* Test if bit i of 'integer' is set */ 054 int bit_i = (integer & (1 << i)); 066 int bit_i = (integer & (1 << i)); 055 /* Ascii 219 => dark carret, Ascii 177 = 067 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 056 unsigned char ascii_code = bit_i?219:177 068 unsigned char ascii_code = bit_i?219:177; 057 sos_x86_videomem_putchar(row, col++, 069 sos_x86_videomem_putchar(row, col++, 058 attribute, 070 attribute, 059 ascii_code); 071 ascii_code); 060 } 072 } 061 } 073 } 062 074 063 << 064 /* Clock IRQ handler */ 075 /* Clock IRQ handler */ 065 static void clk_it(int intid) 076 static void clk_it(int intid) 066 { 077 { 067 static sos_ui32_t clock_count = 0; 078 static sos_ui32_t clock_count = 0; 068 079 069 display_bits(0, 48, 080 display_bits(0, 48, 070 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 081 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 071 clock_count); 082 clock_count); 072 clock_count++; 083 clock_count++; 073 084 074 /* Execute the expired timeout actions (if a 085 /* Execute the expired timeout actions (if any) */ 075 sos_time_do_tick(); 086 sos_time_do_tick(); 076 087 077 /* Update scheduler statistics and status */ 088 /* Update scheduler statistics and status */ 078 sos_sched_do_timer_tick(); 089 sos_sched_do_timer_tick(); 079 } 090 } 080 091 081 092 082 /* =========================================== 093 /* ====================================================================== 083 * Page fault exception handling 094 * Page fault exception handling 084 */ 095 */ 085 096 086 097 087 /* Page fault exception handler with demand pa 098 /* Page fault exception handler with demand paging for the kernel */ 088 static void pgflt_ex(int intid, struct sos_cpu 099 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 089 { 100 { 090 static sos_ui32_t demand_paging_count = 0; 101 static sos_ui32_t demand_paging_count = 0; >> 102 struct sos_thread * cur_thr = sos_thread_get_current(); 091 sos_vaddr_t faulting_vaddr = sos_cpu_contex 103 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 092 sos_paddr_t ppage_paddr; 104 sos_paddr_t ppage_paddr; 093 105 094 if (sos_cpu_context_is_in_user_mode(ctxt)) !! 106 if (sos_cpu_context_is_in_user_mode(ctxt) >> 107 || (cur_thr->fixup_uaccess.return_vaddr)) 095 { 108 { 096 /* User-mode page faults are considered !! 109 __label__ unforce_address_space; 097 moment */ !! 110 sos_bool_t need_to_setup_mmu; >> 111 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); >> 112 >> 113 /* Make sure to always stay in the interrupted thread's MMU >> 114 configuration */ >> 115 need_to_setup_mmu = (cur_thr->squatted_mm_context >> 116 != sos_process_get_mm_context(cur_thr->process)); >> 117 if (need_to_setup_mmu) >> 118 sos_thread_prepare_user_space_access(NULL, 0); >> 119 >> 120 if (SOS_OK == >> 121 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, >> 122 errcode & (1 << 1), >> 123 TRUE)) >> 124 goto unforce_address_space; >> 125 >> 126 /* If the page fault occured in kernel mode, return to kernel to >> 127 the fixup address */ >> 128 if (! sos_cpu_context_is_in_user_mode(ctxt)) >> 129 { >> 130 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; >> 131 sos_cpu_context_set_EX_return_address(ctxt, >> 132 cur_thr->fixup_uaccess.return_vaddr); >> 133 goto unforce_address_space; >> 134 } >> 135 >> 136 if (need_to_setup_mmu) >> 137 sos_thread_end_user_space_access(); >> 138 098 sos_bochs_printf("Unresolved USER page F 139 sos_bochs_printf("Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\n", 099 sos_cpu_context_get_PC( 140 sos_cpu_context_get_PC(ctxt), 100 (unsigned)faulting_vadd 141 (unsigned)faulting_vaddr, 101 (unsigned)sos_cpu_conte 142 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 102 sos_bochs_printf("Terminating User threa 143 sos_bochs_printf("Terminating User thread\n"); 103 sos_thread_exit(); 144 sos_thread_exit(); >> 145 >> 146 unforce_address_space: >> 147 if (need_to_setup_mmu) >> 148 sos_thread_end_user_space_access(); >> 149 return; 104 } 150 } 105 151 106 /* Check if address is covered by any VMM ra 152 /* Check if address is covered by any VMM range */ 107 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 153 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 108 { 154 { 109 /* No: The page fault is out of any kern 155 /* No: The page fault is out of any kernel virtual region. For 110 the moment, we don't handle this. */ 156 the moment, we don't handle this. */ 111 sos_display_fatal_error("Unresolved page 157 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", 112 sos_cpu_context_ 158 sos_cpu_context_get_PC(ctxt), 113 (unsigned)faulti 159 (unsigned)faulting_vaddr, 114 (unsigned)sos_cp 160 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 115 SOS_ASSERT_FATAL(! "Got page fault (note 161 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 116 } 162 } 117 163 118 164 119 /* 165 /* 120 * Demand paging in kernel space 166 * Demand paging in kernel space 121 */ 167 */ 122 168 123 /* Update the number of demand paging reques 169 /* Update the number of demand paging requests handled */ 124 demand_paging_count ++; 170 demand_paging_count ++; 125 display_bits(0, 0, 171 display_bits(0, 0, 126 SOS_X86_VIDEO_FG_LTRED | SOS_X8 172 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 127 demand_paging_count); 173 demand_paging_count); 128 174 129 /* Allocate a new page for the virtual addre 175 /* Allocate a new page for the virtual address */ 130 ppage_paddr = sos_physmem_ref_physpage_new(F 176 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 131 if (! ppage_paddr) 177 if (! ppage_paddr) 132 SOS_ASSERT_FATAL(! "TODO: implement swap. 178 SOS_ASSERT_FATAL(! "TODO: implement swap. (Out of mem in demand paging because no swap for kernel yet !)"); 133 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 179 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 134 SO 180 SOS_PAGE_ALIGN_INF(faulting_vaddr), 135 FA 181 FALSE, 136 SO 182 SOS_VM_MAP_PROT_READ 137 | 183 | SOS_VM_MAP_PROT_WRITE 138 | 184 | SOS_VM_MAP_ATOMIC)); 139 sos_physmem_unref_physpage(ppage_paddr); 185 sos_physmem_unref_physpage(ppage_paddr); 140 186 141 /* Ok, we can now return to interrupted cont 187 /* Ok, we can now return to interrupted context */ 142 } 188 } 143 189 144 190 145 /* =========================================== << 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 << 241 191 242 /* =========================================== 192 /* ====================================================================== 243 * An operating system MUST always have a read 193 * An operating system MUST always have a ready thread ! Otherwise: 244 * what would the CPU have to execute ?! 194 * what would the CPU have to execute ?! 245 */ 195 */ 246 static void idle_thread() 196 static void idle_thread() 247 { 197 { 248 sos_ui32_t idle_twiddle = 0; 198 sos_ui32_t idle_twiddle = 0; 249 199 250 while (1) 200 while (1) 251 { 201 { 252 /* Remove this instruction if you get an 202 /* Remove this instruction if you get an "Invalid opcode" CPU 253 exception (old 80386 CPU) */ 203 exception (old 80386 CPU) */ 254 asm("hlt\n"); 204 asm("hlt\n"); 255 205 256 idle_twiddle ++; 206 idle_twiddle ++; 257 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE 207 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 258 idle_twiddle); 208 idle_twiddle); 259 209 260 /* Lend the CPU to some other thread */ 210 /* Lend the CPU to some other thread */ 261 sos_thread_yield(); 211 sos_thread_yield(); 262 } 212 } 263 } 213 } 264 214 265 215 266 /* =========================================== 216 /* ====================================================================== 267 * Kernel thread showing some CPU usage statis 217 * Kernel thread showing some CPU usage statistics on the console every 1s 268 */ 218 */ >> 219 #define LOAD_DISPLAY_BASELINE 4 >> 220 #define LOAD_DISPLAY_STARTROW 34 269 static void stat_thread() 221 static void stat_thread() 270 { 222 { 271 while (1) 223 while (1) 272 { 224 { 273 sos_ui32_t flags; 225 sos_ui32_t flags; 274 sos_ui32_t load1, load5, load15; 226 sos_ui32_t load1, load5, load15; 275 char str1[11], str5[11], str15[11]; 227 char str1[11], str5[11], str15[11]; 276 struct sos_time t; 228 struct sos_time t; 277 t.sec = 1; 229 t.sec = 1; 278 t.nanosec = 0; 230 t.nanosec = 0; 279 231 280 sos_thread_sleep(& t); 232 sos_thread_sleep(& t); 281 233 282 sos_disable_IRQs(flags); 234 sos_disable_IRQs(flags); 283 235 284 /* The IDLE task is EXcluded in the foll 236 /* The IDLE task is EXcluded in the following computation */ 285 sos_load_get_sload(&load1, &load5, &load 237 sos_load_get_sload(&load1, &load5, &load15); 286 sos_load_to_string(str1, load1); 238 sos_load_to_string(str1, load1); 287 sos_load_to_string(str5, load5); 239 sos_load_to_string(str5, load5); 288 sos_load_to_string(str15, load15); 240 sos_load_to_string(str15, load15); 289 sos_x86_videomem_printf(16, 34, !! 241 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+0, LOAD_DISPLAY_STARTROW, 290 SOS_X86_VIDEO_FG 242 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 291 "Kernel (- Idle) 243 "Kernel (- Idle): %s %s %s ", 292 str1, str5, str1 244 str1, str5, str15); 293 245 294 sos_load_get_uload(&load1, &load5, &load 246 sos_load_get_uload(&load1, &load5, &load15); 295 sos_load_to_string(str1, load1); 247 sos_load_to_string(str1, load1); 296 sos_load_to_string(str5, load5); 248 sos_load_to_string(str5, load5); 297 sos_load_to_string(str15, load15); 249 sos_load_to_string(str15, load15); 298 sos_x86_videomem_printf(17, 34, !! 250 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+1, LOAD_DISPLAY_STARTROW, 299 SOS_X86_VIDEO_FG 251 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 300 "User: %s %s %s 252 "User: %s %s %s ", 301 str1, str5, str1 253 str1, str5, str15); 302 254 303 sos_load_get_uratio(&load1, &load5, &loa 255 sos_load_get_uratio(&load1, &load5, &load15); 304 sos_load_to_string(str1, load1); 256 sos_load_to_string(str1, load1); 305 sos_load_to_string(str5, load5); 257 sos_load_to_string(str5, load5); 306 sos_load_to_string(str15, load15); 258 sos_load_to_string(str15, load15); 307 sos_x86_videomem_printf(18, 34, !! 259 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+2, LOAD_DISPLAY_STARTROW, 308 SOS_X86_VIDEO_FG 260 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 309 "User CPU %%: %s 261 "User CPU %%: %s %s %s ", 310 str1, str5, str1 262 str1, str5, str15); 311 263 312 /* The IDLE task is INcluded in the foll 264 /* The IDLE task is INcluded in the following computation */ 313 sos_load_get_sratio(&load1, &load5, &loa 265 sos_load_get_sratio(&load1, &load5, &load15); 314 sos_load_to_string(str1, load1); 266 sos_load_to_string(str1, load1); 315 sos_load_to_string(str5, load5); 267 sos_load_to_string(str5, load5); 316 sos_load_to_string(str15, load15); 268 sos_load_to_string(str15, load15); 317 sos_x86_videomem_printf(19, 34, !! 269 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+3, LOAD_DISPLAY_STARTROW, 318 SOS_X86_VIDEO_FG 270 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 319 "Kernel CPU %% ( 271 "Kernel CPU %% (+ Idle): %s %s %s ", 320 str1, str5, str1 272 str1, str5, str15); 321 sos_restore_IRQs(flags); 273 sos_restore_IRQs(flags); 322 } 274 } 323 } 275 } 324 276 325 277 326 /* =========================================== 278 /* ====================================================================== >> 279 * Start the "init" (userland) process >> 280 */ >> 281 static sos_ret_t >> 282 start_init(struct sos_fs_manager_instance * rootfs) >> 283 { >> 284 sos_ret_t retval; >> 285 struct sos_umem_vmm_as *as_init; >> 286 struct sos_process *proc_init; >> 287 struct sos_thread *new_thr; >> 288 sos_uaddr_t ustack, start_uaddr; >> 289 struct sos_fs_opened_file * init_root, * init_cwd, * unused_of; >> 290 >> 291 /* Create the new process */ >> 292 proc_init = sos_process_create("init", FALSE); >> 293 if (! proc_init) >> 294 return -SOS_ENOMEM; >> 295 as_init = sos_process_get_address_space(proc_init); >> 296 >> 297 >> 298 /* >> 299 * Setup the root and CWD directories of the process. The root of >> 300 * this process will correspond to the "global" root of the whole >> 301 * system since all the future processes will duplicate it ! >> 302 */ >> 303 retval = sos_fs_new_opened_file(proc_init, rootfs->root, >> 304 SOS_FS_OPEN_READ | SOS_FS_OPEN_WRITE, >> 305 & init_root); >> 306 if (SOS_OK != retval) >> 307 { >> 308 sos_process_unref(proc_init); >> 309 return -SOS_ENOENT; >> 310 } >> 311 >> 312 /* Duplicate the root file to set the current working directory of >> 313 the init process */ >> 314 retval = sos_fs_duplicate_opened_file(init_root, proc_init, >> 315 & init_cwd); >> 316 if (SOS_OK != retval) >> 317 { >> 318 sos_fs_close(init_root); >> 319 sos_process_unref(proc_init); >> 320 return -SOS_ENOENT; >> 321 } >> 322 >> 323 /* Now update the process ! */ >> 324 if ( ( SOS_OK != sos_process_chroot(proc_init, init_root, & unused_of) ) >> 325 || ( SOS_OK != sos_process_chdir(proc_init, init_cwd, & unused_of) ) ) >> 326 { >> 327 sos_fs_close(init_root); >> 328 sos_fs_close(init_cwd); >> 329 sos_process_chroot(proc_init, NULL, & unused_of); >> 330 sos_process_chdir(proc_init, NULL, & unused_of); >> 331 sos_process_unref(proc_init); >> 332 return -SOS_ENOENT; >> 333 } >> 334 >> 335 >> 336 >> 337 /* Map the 'init' program in user space */ >> 338 start_uaddr = sos_binfmt_elf32_map(as_init, "init"); >> 339 if (0 == start_uaddr) >> 340 { >> 341 sos_process_unref(proc_init); >> 342 return -SOS_ENOENT; >> 343 } >> 344 >> 345 /* Allocate the user stack */ >> 346 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; >> 347 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, >> 348 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, >> 349 /* PRIVATE */ 0); >> 350 if (SOS_OK != retval) >> 351 { >> 352 sos_process_unref(proc_init); >> 353 return -SOS_ENOMEM; >> 354 } >> 355 >> 356 /* Now create the user thread */ >> 357 new_thr = sos_create_user_thread(NULL, >> 358 proc_init, >> 359 start_uaddr, >> 360 0, 0, >> 361 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, >> 362 SOS_SCHED_PRIO_TS_LOWEST); >> 363 if (! new_thr) >> 364 { >> 365 sos_process_unref(proc_init); >> 366 return -SOS_ENOMEM; >> 367 } >> 368 >> 369 sos_process_unref(proc_init); >> 370 return SOS_OK; >> 371 } >> 372 >> 373 >> 374 /* ====================================================================== 327 * The C entry point of our operating system 375 * The C entry point of our operating system 328 */ 376 */ 329 void sos_main(unsigned long magic, unsigned lo !! 377 void sos_main(unsigned long magic, unsigned long arg) 330 { 378 { 331 unsigned i; 379 unsigned i; 332 sos_paddr_t sos_kernel_core_base_paddr, sos_ 380 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 333 struct sos_time tick_resolution; 381 struct sos_time tick_resolution; >> 382 struct sos_fs_manager_instance * rootfs; 334 383 335 /* Grub sends us a structure, called multibo !! 384 /* Size of RAM above 1MB. Might be undefined ! */ 336 precious informations about the system, s !! 385 unsigned long int upper_mem = 0; 337 documentation for more information. */ << 338 multiboot_info_t *mbi; << 339 mbi = (multiboot_info_t *) addr; << 340 386 341 /* Setup bochs and console, and clear the co 387 /* Setup bochs and console, and clear the console */ 342 sos_bochs_setup(); !! 388 sos_bochs_subsystem_setup(); 343 389 344 sos_x86_videomem_setup(); 390 sos_x86_videomem_setup(); 345 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 391 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 346 392 347 /* Greetings from SOS */ 393 /* Greetings from SOS */ 348 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 394 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 349 /* Loaded with Grub */ !! 395 { 350 sos_x86_videomem_printf(1, 0, !! 396 /* Grub sends us a structure, called multiboot_info_t with a lot of 351 SOS_X86_VIDEO_FG_Y !! 397 precious informations about the system, see the multiboot 352 "Welcome From GRUB !! 398 documentation for more information. */ 353 "SOS article 7", ' !! 399 multiboot_info_t *mbi = (multiboot_info_t *) arg; 354 (unsigned)(mbi->me !! 400 355 (unsigned)mbi->mem !! 401 /* Multiboot says: "The value returned for upper memory is >> 402 maximally the address of the first upper memory hole minus 1 >> 403 megabyte.". It also adds: "It is not guaranteed to be this >> 404 value." aka "YMMV" ;) */ >> 405 upper_mem = mbi->mem_upper; >> 406 sos_x86_videomem_printf(1, 0, >> 407 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 408 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 409 "SOS article 9", ',', >> 410 (unsigned)(upper_mem >> 10) + 1, >> 411 (unsigned)upper_mem); >> 412 } >> 413 else if (magic == 0x42244224) >> 414 { >> 415 /* Loaded with SOS bootsect */ >> 416 upper_mem = arg; >> 417 sos_x86_videomem_printf(1, 0, >> 418 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 419 "Welcome to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 420 "SOS article 9", ',', >> 421 (unsigned)(upper_mem >> 10) + 1, >> 422 (unsigned)upper_mem); >> 423 } 356 else 424 else 357 /* Not loaded with grub */ !! 425 /* Not loaded with grub, not from an enhanced bootsect */ 358 sos_x86_videomem_printf(1, 0, 426 sos_x86_videomem_printf(1, 0, 359 SOS_X86_VIDEO_FG_Y 427 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 360 "Welcome to SOS ar !! 428 "Welcome to SOS article 9"); 361 429 362 sos_bochs_putstring("Message in a bochs: Thi !! 430 sos_bochs_putstring("Message in a bochs: This is SOS article 9.\n"); 363 431 364 /* Setup CPU segmentation and IRQ subsystem 432 /* Setup CPU segmentation and IRQ subsystem */ 365 sos_gdt_subsystem_setup(); 433 sos_gdt_subsystem_setup(); 366 sos_idt_subsystem_setup(); 434 sos_idt_subsystem_setup(); 367 435 368 /* Setup SOS IRQs and exceptions subsystem * 436 /* Setup SOS IRQs and exceptions subsystem */ 369 sos_exception_subsystem_setup(); 437 sos_exception_subsystem_setup(); 370 sos_irq_subsystem_setup(); 438 sos_irq_subsystem_setup(); 371 439 372 /* Configure the timer so as to raise the IR 440 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 373 sos_i8254_set_frequency(100); 441 sos_i8254_set_frequency(100); 374 442 375 /* Setup the kernel time subsystem to get pr 443 /* Setup the kernel time subsystem to get prepared to take the timer 376 ticks into account */ 444 ticks into account */ 377 tick_resolution = (struct sos_time) { .sec=0 445 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 378 sos_time_subsysem_setup(& tick_resolution); 446 sos_time_subsysem_setup(& tick_resolution); 379 447 380 /* We need a multiboot-compliant boot loader !! 448 /* We need to know the RAM size */ 381 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) !! 449 if (upper_mem == 0) 382 { 450 { 383 sos_x86_videomem_putstring(20, 0, 451 sos_x86_videomem_putstring(20, 0, 384 SOS_X86_VIDEO 452 SOS_X86_VIDEO_FG_LTRED 385 | SOS_X86_V 453 | SOS_X86_VIDEO_BG_BLUE 386 | SOS_X86_V 454 | SOS_X86_VIDEO_FG_BLINKING, 387 "I'm not load !! 455 "I don't know RAM size ! Load me with Grub..."); 388 /* STOP ! */ 456 /* STOP ! */ 389 for (;;) 457 for (;;) 390 continue; 458 continue; 391 } 459 } 392 460 393 /* 461 /* 394 * Some interrupt handlers 462 * Some interrupt handlers 395 */ 463 */ 396 464 397 /* Binding some HW interrupts and exceptions 465 /* Binding some HW interrupts and exceptions to software routines */ 398 sos_irq_set_routine(SOS_IRQ_TIMER, 466 sos_irq_set_routine(SOS_IRQ_TIMER, 399 clk_it); 467 clk_it); 400 468 401 /* 469 /* 402 * Setup physical memory management 470 * Setup physical memory management 403 */ 471 */ 404 472 405 /* Multiboot says: "The value returned for u !! 473 SOS_ASSERT_FATAL(SOS_OK 406 the address of the first upper memory hol !! 474 == sos_physmem_subsystem_setup((upper_mem<<10) + (1<<20), 407 also adds: "It is not guaranteed to be th !! 475 &sos_kernel_core_base_paddr, 408 sos_physmem_subsystem_setup((mbi->mem_upper< !! 476 &sos_kernel_core_top_paddr)); 409 & sos_kernel_cor << 410 & sos_kernel_cor << 411 477 412 /* 478 /* 413 * Switch to paged-memory mode 479 * Switch to paged-memory mode 414 */ 480 */ 415 481 416 /* Disabling interrupts should seem more cor 482 /* Disabling interrupts should seem more correct, but it's not really 417 necessary at this stage */ 483 necessary at this stage */ 418 SOS_ASSERT_FATAL(SOS_OK == 484 SOS_ASSERT_FATAL(SOS_OK == 419 sos_paging_subsystem_setup( 485 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 420 486 sos_kernel_core_top_paddr)); 421 487 422 /* Bind the page fault exception */ 488 /* Bind the page fault exception */ 423 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 489 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 424 pgflt_ex); 490 pgflt_ex); 425 491 426 /* 492 /* 427 * Setup kernel virtual memory allocator 493 * Setup kernel virtual memory allocator 428 */ 494 */ 429 495 430 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 496 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 431 sos_kernel_ 497 sos_kernel_core_top_paddr, 432 bootstrap_s 498 bootstrap_stack_bottom, 433 bootstrap_s 499 bootstrap_stack_bottom 434 + bootstrap 500 + bootstrap_stack_size)) 435 sos_bochs_printf("Could not setup the Kern 501 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 436 502 437 if (sos_kmalloc_subsystem_setup()) 503 if (sos_kmalloc_subsystem_setup()) 438 sos_bochs_printf("Could not setup the Kmal 504 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 439 505 440 /* 506 /* 441 * Initialize the MMU context subsystem 507 * Initialize the MMU context subsystem 442 */ 508 */ 443 sos_mm_context_subsystem_setup(); 509 sos_mm_context_subsystem_setup(); 444 510 445 /* 511 /* 446 * Initialize the CPU context subsystem 512 * Initialize the CPU context subsystem 447 */ 513 */ 448 sos_cpu_context_subsystem_setup(); 514 sos_cpu_context_subsystem_setup(); 449 515 450 /* 516 /* 451 * Bind the syscall handler to its software 517 * Bind the syscall handler to its software interrupt handler 452 */ 518 */ 453 sos_swintr_subsystem_setup(); 519 sos_swintr_subsystem_setup(); 454 520 455 521 456 /* 522 /* 457 * Initialize the Kernel thread and schedule 523 * Initialize the Kernel thread and scheduler subsystems 458 */ 524 */ 459 525 460 /* Initialize kernel thread subsystem */ 526 /* Initialize kernel thread subsystem */ 461 sos_thread_subsystem_setup(bootstrap_stack_b 527 sos_thread_subsystem_setup(bootstrap_stack_bottom, 462 bootstrap_stack_s 528 bootstrap_stack_size); 463 529 464 /* Initialize the scheduler */ 530 /* Initialize the scheduler */ 465 sos_sched_subsystem_setup(); 531 sos_sched_subsystem_setup(); 466 532 467 /* Declare the IDLE thread */ 533 /* Declare the IDLE thread */ 468 SOS_ASSERT_FATAL(sos_create_kernel_thread("i 534 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, 469 SO 535 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 470 536 471 /* Prepare the stats subsystem */ 537 /* Prepare the stats subsystem */ 472 sos_load_subsystem_setup(); 538 sos_load_subsystem_setup(); 473 539 474 /* Declare a thread that prints some stats * 540 /* Declare a thread that prints some stats */ 475 SOS_ASSERT_FATAL(sos_create_kernel_thread("s 541 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, 476 NU 542 NULL, 477 SO 543 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 478 544 479 545 480 /* 546 /* >> 547 * Initialise user address space management subsystem >> 548 */ >> 549 sos_umem_vmm_subsystem_setup(); >> 550 sos_dev_zero_subsystem_setup(); >> 551 sos_dev_mem_chardev_setup(); >> 552 >> 553 /* 481 * Initialize process stuff 554 * Initialize process stuff 482 */ 555 */ 483 sos_process_subsystem_setup(); 556 sos_process_subsystem_setup(); 484 557 485 558 486 /* Enabling the HW interrupts here, this wil 559 /* Enabling the HW interrupts here, this will make the timer HW 487 interrupt call the scheduler */ 560 interrupt call the scheduler */ 488 asm volatile ("sti\n"); 561 asm volatile ("sti\n"); 489 562 490 /* 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(); << 498 563 >> 564 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_subsystem_setup()); >> 565 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_setup(NULL, >> 566 "virtfs", >> 567 NULL, >> 568 & rootfs)); >> 569 >> 570 >> 571 tty_subsystem_setup(); >> 572 sos_ttyS0_subsystem_setup(); >> 573 sos_console_subsystem_setup(); >> 574 >> 575 >> 576 >> 577 >> 578 /* Start the 'init' process, which in turns launches the other >> 579 programs */ >> 580 start_init(rootfs); 499 /* 581 /* 500 * We can safely exit from this function now 582 * We can safely exit from this function now, for there is already 501 * an idle Kernel thread ready to make the C 583 * an idle Kernel thread ready to make the CPU busy working... 502 * 584 * 503 * However, we must EXPLICITELY call sos_thr 585 * However, we must EXPLICITELY call sos_thread_exit() because a 504 * simple "return" will return nowhere ! Act 586 * simple "return" will return nowhere ! Actually this first thread 505 * was initialized by the Grub bootstrap sta 587 * was initialized by the Grub bootstrap stage, at a time when the 506 * word "thread" did not exist. This means t 588 * word "thread" did not exist. This means that the stack was not 507 * setup in order for a return here to call 589 * setup in order for a return here to call sos_thread_exit() 508 * automagically. Hence we must call it manu 590 * automagically. Hence we must call it manually. This is the ONLY 509 * kernel thread where we must do this manua 591 * kernel thread where we must do this manually. 510 */ 592 */ 511 sos_bochs_printf("Bye from primary thread !\ 593 sos_bochs_printf("Bye from primary thread !\n"); 512 sos_thread_exit(); 594 sos_thread_exit(); 513 SOS_FATAL_ERROR("No trespassing !"); 595 SOS_FATAL_ERROR("No trespassing !"); 514 } 596 }
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