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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> 019 #include <sos/errno.h> 020 020 021 /* Include definitions of the multiboot standa 021 /* Include definitions of the multiboot standard */ 022 #include <bootstrap/multiboot.h> 022 #include <bootstrap/multiboot.h> 023 #include <hwcore/idt.h> 023 #include <hwcore/idt.h> 024 #include <hwcore/gdt.h> 024 #include <hwcore/gdt.h> 025 #include <hwcore/irq.h> 025 #include <hwcore/irq.h> 026 #include <hwcore/exception.h> 026 #include <hwcore/exception.h> 027 #include <hwcore/i8254.h> 027 #include <hwcore/i8254.h> 028 #include <sos/list.h> 028 #include <sos/list.h> 029 #include <sos/physmem.h> 029 #include <sos/physmem.h> 030 #include <hwcore/paging.h> 030 #include <hwcore/paging.h> 031 #include <hwcore/mm_context.h> 031 #include <hwcore/mm_context.h> 032 #include <hwcore/swintr.h> 032 #include <hwcore/swintr.h> 033 #include <sos/kmem_vmm.h> 033 #include <sos/kmem_vmm.h> 034 #include <sos/kmalloc.h> 034 #include <sos/kmalloc.h> 035 #include <sos/time.h> 035 #include <sos/time.h> 036 #include <sos/thread.h> 036 #include <sos/thread.h> 037 #include <sos/process.h> 037 #include <sos/process.h> 038 #include <sos/umem_vmm.h> 038 #include <sos/umem_vmm.h> 039 #include <sos/klibc.h> 039 #include <sos/klibc.h> 040 #include <sos/assert.h> 040 #include <sos/assert.h> 041 #include <drivers/x86_videomem.h> 041 #include <drivers/x86_videomem.h> 042 #include <drivers/bochs.h> 042 #include <drivers/bochs.h> 043 #include <sos/calcload.h> 043 #include <sos/calcload.h> 044 #include <sos/umem_vmm.h> 044 #include <sos/umem_vmm.h> 045 #include <sos/binfmt_elf32.h> 045 #include <sos/binfmt_elf32.h> 046 #include <drivers/zero.h> 046 #include <drivers/zero.h> 047 #include <sos/fs.h> 047 #include <sos/fs.h> 048 #include <drivers/fs_virtfs.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> << 054 049 055 /* Helper function to display each bits of a 3 050 /* Helper function to display each bits of a 32bits integer on the 056 screen as dark or light carrets */ 051 screen as dark or light carrets */ 057 void display_bits(unsigned char row, unsigned 052 void display_bits(unsigned char row, unsigned char col, 058 unsigned char attribute, 053 unsigned char attribute, 059 sos_ui32_t integer) 054 sos_ui32_t integer) 060 { 055 { 061 int i; 056 int i; 062 /* Scan each bit of the integer, MSb first * 057 /* Scan each bit of the integer, MSb first */ 063 for (i = 31 ; i >= 0 ; i--) 058 for (i = 31 ; i >= 0 ; i--) 064 { 059 { 065 /* Test if bit i of 'integer' is set */ 060 /* Test if bit i of 'integer' is set */ 066 int bit_i = (integer & (1 << i)); 061 int bit_i = (integer & (1 << i)); 067 /* Ascii 219 => dark carret, Ascii 177 = 062 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 068 unsigned char ascii_code = bit_i?219:177 063 unsigned char ascii_code = bit_i?219:177; 069 sos_x86_videomem_putchar(row, col++, 064 sos_x86_videomem_putchar(row, col++, 070 attribute, 065 attribute, 071 ascii_code); 066 ascii_code); 072 } 067 } 073 } 068 } 074 069 075 /* Clock IRQ handler */ 070 /* Clock IRQ handler */ 076 static void clk_it(int intid) 071 static void clk_it(int intid) 077 { 072 { 078 static sos_ui32_t clock_count = 0; 073 static sos_ui32_t clock_count = 0; 079 074 080 display_bits(0, 48, 075 display_bits(0, 48, 081 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 076 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 082 clock_count); 077 clock_count); 083 clock_count++; 078 clock_count++; 084 079 085 /* Execute the expired timeout actions (if a 080 /* Execute the expired timeout actions (if any) */ 086 sos_time_do_tick(); 081 sos_time_do_tick(); 087 082 088 /* Update scheduler statistics and status */ 083 /* Update scheduler statistics and status */ 089 sos_sched_do_timer_tick(); 084 sos_sched_do_timer_tick(); 090 } 085 } 091 086 092 087 093 /* =========================================== 088 /* ====================================================================== 094 * Page fault exception handling 089 * Page fault exception handling 095 */ 090 */ 096 091 097 092 098 /* Page fault exception handler with demand pa 093 /* Page fault exception handler with demand paging for the kernel */ 099 static void pgflt_ex(int intid, struct sos_cpu 094 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 100 { 095 { 101 static sos_ui32_t demand_paging_count = 0; 096 static sos_ui32_t demand_paging_count = 0; 102 struct sos_thread * cur_thr = sos_thread_get 097 struct sos_thread * cur_thr = sos_thread_get_current(); 103 sos_vaddr_t faulting_vaddr = sos_cpu_contex 098 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 104 sos_paddr_t ppage_paddr; 099 sos_paddr_t ppage_paddr; 105 100 106 if (sos_cpu_context_is_in_user_mode(ctxt) 101 if (sos_cpu_context_is_in_user_mode(ctxt) 107 || (cur_thr->fixup_uaccess.return_vaddr) 102 || (cur_thr->fixup_uaccess.return_vaddr)) 108 { 103 { 109 __label__ unforce_address_space; 104 __label__ unforce_address_space; 110 sos_bool_t need_to_setup_mmu; 105 sos_bool_t need_to_setup_mmu; 111 sos_ui32_t errcode = sos_cpu_context_get 106 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); 112 107 113 /* Make sure to always stay in the inter 108 /* Make sure to always stay in the interrupted thread's MMU 114 configuration */ 109 configuration */ 115 need_to_setup_mmu = (cur_thr->squatted_m 110 need_to_setup_mmu = (cur_thr->squatted_mm_context 116 != sos_process_get_ 111 != sos_process_get_mm_context(cur_thr->process)); 117 if (need_to_setup_mmu) 112 if (need_to_setup_mmu) 118 sos_thread_prepare_user_space_access(N 113 sos_thread_prepare_user_space_access(NULL, 0); 119 114 120 if (SOS_OK == 115 if (SOS_OK == 121 sos_umem_vmm_try_resolve_page_fault( 116 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, 122 117 errcode & (1 << 1), 123 118 TRUE)) 124 goto unforce_address_space; 119 goto unforce_address_space; 125 120 126 /* If the page fault occured in kernel m 121 /* If the page fault occured in kernel mode, return to kernel to 127 the fixup address */ 122 the fixup address */ 128 if (! sos_cpu_context_is_in_user_mode(ct 123 if (! sos_cpu_context_is_in_user_mode(ctxt)) 129 { 124 { 130 cur_thr->fixup_uaccess.faulted_uaddr 125 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; 131 sos_cpu_context_set_EX_return_addres 126 sos_cpu_context_set_EX_return_address(ctxt, 132 127 cur_thr->fixup_uaccess.return_vaddr); 133 goto unforce_address_space; 128 goto unforce_address_space; 134 } 129 } 135 130 136 if (need_to_setup_mmu) 131 if (need_to_setup_mmu) 137 sos_thread_end_user_space_access(); 132 sos_thread_end_user_space_access(); 138 133 139 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", 140 sos_cpu_context_get_PC( 135 sos_cpu_context_get_PC(ctxt), 141 (unsigned)faulting_vadd 136 (unsigned)faulting_vaddr, 142 (unsigned)sos_cpu_conte 137 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 143 sos_bochs_printf("Terminating User threa 138 sos_bochs_printf("Terminating User thread\n"); 144 sos_thread_exit(); 139 sos_thread_exit(); 145 140 146 unforce_address_space: 141 unforce_address_space: 147 if (need_to_setup_mmu) 142 if (need_to_setup_mmu) 148 sos_thread_end_user_space_access(); 143 sos_thread_end_user_space_access(); 149 return; 144 return; 150 } 145 } 151 146 152 /* Check if address is covered by any VMM ra 147 /* Check if address is covered by any VMM range */ 153 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 148 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 154 { 149 { 155 /* No: The page fault is out of any kern 150 /* No: The page fault is out of any kernel virtual region. For 156 the moment, we don't handle this. */ 151 the moment, we don't handle this. */ 157 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)!", 158 sos_cpu_context_ 153 sos_cpu_context_get_PC(ctxt), 159 (unsigned)faulti 154 (unsigned)faulting_vaddr, 160 (unsigned)sos_cp 155 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 161 SOS_ASSERT_FATAL(! "Got page fault (note 156 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 162 } 157 } 163 158 164 159 165 /* 160 /* 166 * Demand paging in kernel space 161 * Demand paging in kernel space 167 */ 162 */ 168 163 169 /* Update the number of demand paging reques 164 /* Update the number of demand paging requests handled */ 170 demand_paging_count ++; 165 demand_paging_count ++; 171 display_bits(0, 0, 166 display_bits(0, 0, 172 SOS_X86_VIDEO_FG_LTRED | SOS_X8 167 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 173 demand_paging_count); 168 demand_paging_count); 174 169 175 /* Allocate a new page for the virtual addre 170 /* Allocate a new page for the virtual address */ 176 ppage_paddr = sos_physmem_ref_physpage_new(F 171 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 177 if (! ppage_paddr) 172 if (! ppage_paddr) 178 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 !)"); 179 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 174 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 180 SO 175 SOS_PAGE_ALIGN_INF(faulting_vaddr), 181 FA 176 FALSE, 182 SO 177 SOS_VM_MAP_PROT_READ 183 | 178 | SOS_VM_MAP_PROT_WRITE 184 | 179 | SOS_VM_MAP_ATOMIC)); 185 sos_physmem_unref_physpage(ppage_paddr); 180 sos_physmem_unref_physpage(ppage_paddr); 186 181 187 /* Ok, we can now return to interrupted cont 182 /* Ok, we can now return to interrupted context */ 188 } 183 } 189 184 190 185 191 186 192 /* =========================================== 187 /* ====================================================================== 193 * An operating system MUST always have a read 188 * An operating system MUST always have a ready thread ! Otherwise: 194 * what would the CPU have to execute ?! 189 * what would the CPU have to execute ?! 195 */ 190 */ 196 static void idle_thread() 191 static void idle_thread() 197 { 192 { 198 sos_ui32_t idle_twiddle = 0; 193 sos_ui32_t idle_twiddle = 0; 199 194 200 while (1) 195 while (1) 201 { 196 { 202 /* Remove this instruction if you get an 197 /* Remove this instruction if you get an "Invalid opcode" CPU 203 exception (old 80386 CPU) */ 198 exception (old 80386 CPU) */ 204 asm("hlt\n"); 199 asm("hlt\n"); 205 200 206 idle_twiddle ++; 201 idle_twiddle ++; 207 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE 202 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 208 idle_twiddle); 203 idle_twiddle); 209 204 210 /* Lend the CPU to some other thread */ 205 /* Lend the CPU to some other thread */ 211 sos_thread_yield(); 206 sos_thread_yield(); 212 } 207 } 213 } 208 } 214 209 215 210 216 /* =========================================== 211 /* ====================================================================== 217 * Kernel thread showing some CPU usage statis 212 * Kernel thread showing some CPU usage statistics on the console every 1s 218 */ 213 */ 219 #define LOAD_DISPLAY_BASELINE 4 << 220 #define LOAD_DISPLAY_STARTROW 34 << 221 static void stat_thread() 214 static void stat_thread() 222 { 215 { 223 while (1) 216 while (1) 224 { 217 { 225 sos_ui32_t flags; 218 sos_ui32_t flags; 226 sos_ui32_t load1, load5, load15; 219 sos_ui32_t load1, load5, load15; 227 char str1[11], str5[11], str15[11]; 220 char str1[11], str5[11], str15[11]; 228 struct sos_time t; 221 struct sos_time t; 229 t.sec = 1; 222 t.sec = 1; 230 t.nanosec = 0; 223 t.nanosec = 0; 231 224 232 sos_thread_sleep(& t); 225 sos_thread_sleep(& t); 233 226 234 sos_disable_IRQs(flags); 227 sos_disable_IRQs(flags); 235 228 236 /* The IDLE task is EXcluded in the foll 229 /* The IDLE task is EXcluded in the following computation */ 237 sos_load_get_sload(&load1, &load5, &load 230 sos_load_get_sload(&load1, &load5, &load15); 238 sos_load_to_string(str1, load1); 231 sos_load_to_string(str1, load1); 239 sos_load_to_string(str5, load5); 232 sos_load_to_string(str5, load5); 240 sos_load_to_string(str15, load15); 233 sos_load_to_string(str15, load15); 241 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 234 sos_x86_videomem_printf(16, 34, 242 SOS_X86_VIDEO_FG 235 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 243 "Kernel (- Idle) 236 "Kernel (- Idle): %s %s %s ", 244 str1, str5, str1 237 str1, str5, str15); 245 238 246 sos_load_get_uload(&load1, &load5, &load 239 sos_load_get_uload(&load1, &load5, &load15); 247 sos_load_to_string(str1, load1); 240 sos_load_to_string(str1, load1); 248 sos_load_to_string(str5, load5); 241 sos_load_to_string(str5, load5); 249 sos_load_to_string(str15, load15); 242 sos_load_to_string(str15, load15); 250 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 243 sos_x86_videomem_printf(17, 34, 251 SOS_X86_VIDEO_FG 244 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 252 "User: %s %s %s 245 "User: %s %s %s ", 253 str1, str5, str1 246 str1, str5, str15); 254 247 255 sos_load_get_uratio(&load1, &load5, &loa 248 sos_load_get_uratio(&load1, &load5, &load15); 256 sos_load_to_string(str1, load1); 249 sos_load_to_string(str1, load1); 257 sos_load_to_string(str5, load5); 250 sos_load_to_string(str5, load5); 258 sos_load_to_string(str15, load15); 251 sos_load_to_string(str15, load15); 259 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 252 sos_x86_videomem_printf(18, 34, 260 SOS_X86_VIDEO_FG 253 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 261 "User CPU %%: %s 254 "User CPU %%: %s %s %s ", 262 str1, str5, str1 255 str1, str5, str15); 263 256 264 /* The IDLE task is INcluded in the foll 257 /* The IDLE task is INcluded in the following computation */ 265 sos_load_get_sratio(&load1, &load5, &loa 258 sos_load_get_sratio(&load1, &load5, &load15); 266 sos_load_to_string(str1, load1); 259 sos_load_to_string(str1, load1); 267 sos_load_to_string(str5, load5); 260 sos_load_to_string(str5, load5); 268 sos_load_to_string(str15, load15); 261 sos_load_to_string(str15, load15); 269 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 262 sos_x86_videomem_printf(19, 34, 270 SOS_X86_VIDEO_FG 263 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 271 "Kernel CPU %% ( 264 "Kernel CPU %% (+ Idle): %s %s %s ", 272 str1, str5, str1 265 str1, str5, str15); 273 sos_restore_IRQs(flags); 266 sos_restore_IRQs(flags); 274 } 267 } 275 } 268 } 276 269 277 270 278 /* =========================================== 271 /* ====================================================================== 279 * Start the "init" (userland) process 272 * Start the "init" (userland) process 280 */ 273 */ 281 static sos_ret_t 274 static sos_ret_t 282 start_init(struct sos_fs_manager_instance * ro 275 start_init(struct sos_fs_manager_instance * rootfs) 283 { 276 { 284 sos_ret_t retval; 277 sos_ret_t retval; 285 struct sos_umem_vmm_as *as_init; 278 struct sos_umem_vmm_as *as_init; 286 struct sos_process *proc_init; 279 struct sos_process *proc_init; 287 struct sos_thread *new_thr; 280 struct sos_thread *new_thr; 288 sos_uaddr_t ustack, start_uaddr; 281 sos_uaddr_t ustack, start_uaddr; 289 struct sos_fs_opened_file * init_root, * ini 282 struct sos_fs_opened_file * init_root, * init_cwd, * unused_of; 290 283 291 /* Create the new process */ 284 /* Create the new process */ 292 proc_init = sos_process_create("init", FALSE 285 proc_init = sos_process_create("init", FALSE); 293 if (! proc_init) 286 if (! proc_init) 294 return -SOS_ENOMEM; 287 return -SOS_ENOMEM; 295 as_init = sos_process_get_address_space(proc 288 as_init = sos_process_get_address_space(proc_init); 296 289 297 290 298 /* 291 /* 299 * Setup the root and CWD directories of the 292 * Setup the root and CWD directories of the process. The root of 300 * this process will correspond to the "glob 293 * this process will correspond to the "global" root of the whole 301 * system since all the future processes wil 294 * system since all the future processes will duplicate it ! 302 */ 295 */ 303 retval = sos_fs_new_opened_file(proc_init, r 296 retval = sos_fs_new_opened_file(proc_init, rootfs->root, 304 SOS_FS_OPEN_ 297 SOS_FS_OPEN_READ | SOS_FS_OPEN_WRITE, 305 & init_root) 298 & init_root); 306 if (SOS_OK != retval) 299 if (SOS_OK != retval) 307 { 300 { 308 sos_process_unref(proc_init); 301 sos_process_unref(proc_init); 309 return -SOS_ENOENT; 302 return -SOS_ENOENT; 310 } 303 } 311 304 312 /* Duplicate the root file to set the curren 305 /* Duplicate the root file to set the current working directory of 313 the init process */ 306 the init process */ 314 retval = sos_fs_duplicate_opened_file(init_r 307 retval = sos_fs_duplicate_opened_file(init_root, proc_init, 315 & init 308 & init_cwd); 316 if (SOS_OK != retval) 309 if (SOS_OK != retval) 317 { 310 { 318 sos_fs_close(init_root); 311 sos_fs_close(init_root); 319 sos_process_unref(proc_init); 312 sos_process_unref(proc_init); 320 return -SOS_ENOENT; 313 return -SOS_ENOENT; 321 } 314 } 322 315 323 /* Now update the process ! */ 316 /* Now update the process ! */ 324 if ( ( SOS_OK != sos_process_chroot(proc_ini 317 if ( ( SOS_OK != sos_process_chroot(proc_init, init_root, & unused_of) ) 325 || ( SOS_OK != sos_process_chdir(proc_i 318 || ( SOS_OK != sos_process_chdir(proc_init, init_cwd, & unused_of) ) ) 326 { 319 { 327 sos_fs_close(init_root); 320 sos_fs_close(init_root); 328 sos_fs_close(init_cwd); 321 sos_fs_close(init_cwd); 329 sos_process_chroot(proc_init, NULL, & un 322 sos_process_chroot(proc_init, NULL, & unused_of); 330 sos_process_chdir(proc_init, NULL, & unu 323 sos_process_chdir(proc_init, NULL, & unused_of); 331 sos_process_unref(proc_init); 324 sos_process_unref(proc_init); 332 return -SOS_ENOENT; 325 return -SOS_ENOENT; 333 } 326 } 334 327 335 << 336 << 337 /* Map the 'init' program in user space */ 328 /* Map the 'init' program in user space */ 338 start_uaddr = sos_binfmt_elf32_map(as_init, 329 start_uaddr = sos_binfmt_elf32_map(as_init, "init"); 339 if (0 == start_uaddr) 330 if (0 == start_uaddr) 340 { 331 { 341 sos_process_unref(proc_init); 332 sos_process_unref(proc_init); 342 return -SOS_ENOENT; 333 return -SOS_ENOENT; 343 } 334 } 344 335 345 /* Allocate the user stack */ 336 /* Allocate the user stack */ 346 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ 337 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; 347 retval = sos_dev_zero_map(as_init, &ustack, 338 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, 348 SOS_VM_MAP_PROT_RE 339 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, 349 /* PRIVATE */ 0); 340 /* PRIVATE */ 0); 350 if (SOS_OK != retval) 341 if (SOS_OK != retval) 351 { 342 { 352 sos_process_unref(proc_init); 343 sos_process_unref(proc_init); 353 return -SOS_ENOMEM; 344 return -SOS_ENOMEM; 354 } 345 } 355 346 356 /* Now create the user thread */ 347 /* Now create the user thread */ 357 new_thr = sos_create_user_thread(NULL, 348 new_thr = sos_create_user_thread(NULL, 358 proc_init, 349 proc_init, 359 start_uaddr 350 start_uaddr, 360 0, 0, 351 0, 0, 361 ustack + SO 352 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, 362 SOS_SCHED_P 353 SOS_SCHED_PRIO_TS_LOWEST); 363 if (! new_thr) 354 if (! new_thr) 364 { 355 { 365 sos_process_unref(proc_init); 356 sos_process_unref(proc_init); 366 return -SOS_ENOMEM; 357 return -SOS_ENOMEM; 367 } 358 } 368 359 369 sos_process_unref(proc_init); 360 sos_process_unref(proc_init); 370 return SOS_OK; 361 return SOS_OK; 371 } 362 } 372 363 373 364 374 /* =========================================== 365 /* ====================================================================== 375 * The C entry point of our operating system 366 * The C entry point of our operating system 376 */ 367 */ 377 void sos_main(unsigned long magic, unsigned lo 368 void sos_main(unsigned long magic, unsigned long arg) 378 { 369 { 379 unsigned i; 370 unsigned i; 380 sos_paddr_t sos_kernel_core_base_paddr, sos_ 371 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 381 struct sos_time tick_resolution; 372 struct sos_time tick_resolution; 382 struct sos_fs_manager_instance * rootfs; 373 struct sos_fs_manager_instance * rootfs; 383 374 384 /* Size of RAM above 1MB. Might be undefined 375 /* Size of RAM above 1MB. Might be undefined ! */ 385 unsigned long int upper_mem = 0; 376 unsigned long int upper_mem = 0; 386 377 387 /* Setup bochs and console, and clear the co 378 /* Setup bochs and console, and clear the console */ 388 sos_bochs_subsystem_setup(); !! 379 sos_bochs_setup(); 389 380 390 sos_x86_videomem_setup(); 381 sos_x86_videomem_setup(); 391 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 382 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 392 383 393 /* Greetings from SOS */ 384 /* Greetings from SOS */ 394 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 385 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 395 { 386 { 396 /* Grub sends us a structure, called mul 387 /* Grub sends us a structure, called multiboot_info_t with a lot of 397 precious informations about the syste 388 precious informations about the system, see the multiboot 398 documentation for more information. * 389 documentation for more information. */ 399 multiboot_info_t *mbi = (multiboot_info_ 390 multiboot_info_t *mbi = (multiboot_info_t *) arg; 400 391 401 /* Multiboot says: "The value returned f 392 /* Multiboot says: "The value returned for upper memory is 402 maximally the address of the first up 393 maximally the address of the first upper memory hole minus 1 403 megabyte.". It also adds: "It is not 394 megabyte.". It also adds: "It is not guaranteed to be this 404 value." aka "YMMV" ;) */ 395 value." aka "YMMV" ;) */ 405 upper_mem = mbi->mem_upper; 396 upper_mem = mbi->mem_upper; 406 sos_x86_videomem_printf(1, 0, 397 sos_x86_videomem_printf(1, 0, 407 SOS_X86_VIDEO_FG 398 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 408 "Welcome From GR 399 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 409 "SOS article 9", !! 400 "SOS article 8", ',', 410 (unsigned)(upper 401 (unsigned)(upper_mem >> 10) + 1, 411 (unsigned)upper_ 402 (unsigned)upper_mem); 412 } 403 } 413 else if (magic == 0x42244224) 404 else if (magic == 0x42244224) 414 { 405 { 415 /* Loaded with SOS bootsect */ 406 /* Loaded with SOS bootsect */ 416 upper_mem = arg; 407 upper_mem = arg; 417 sos_x86_videomem_printf(1, 0, 408 sos_x86_videomem_printf(1, 0, 418 SOS_X86_VIDEO_FG 409 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 419 "Welcome to %s%c 410 "Welcome to %s%c RAM is %dMB (upper mem = 0x%x kB)", 420 "SOS article 9", !! 411 "SOS article 8", ',', 421 (unsigned)(upper 412 (unsigned)(upper_mem >> 10) + 1, 422 (unsigned)upper_ 413 (unsigned)upper_mem); 423 } 414 } 424 else 415 else 425 /* Not loaded with grub, not from an enhan 416 /* Not loaded with grub, not from an enhanced bootsect */ 426 sos_x86_videomem_printf(1, 0, 417 sos_x86_videomem_printf(1, 0, 427 SOS_X86_VIDEO_FG_Y 418 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 428 "Welcome to SOS ar !! 419 "Welcome to SOS article 8"); 429 420 430 sos_bochs_putstring("Message in a bochs: Thi !! 421 sos_bochs_putstring("Message in a bochs: This is SOS article 8.\n"); 431 422 432 /* Setup CPU segmentation and IRQ subsystem 423 /* Setup CPU segmentation and IRQ subsystem */ 433 sos_gdt_subsystem_setup(); 424 sos_gdt_subsystem_setup(); 434 sos_idt_subsystem_setup(); 425 sos_idt_subsystem_setup(); 435 426 436 /* Setup SOS IRQs and exceptions subsystem * 427 /* Setup SOS IRQs and exceptions subsystem */ 437 sos_exception_subsystem_setup(); 428 sos_exception_subsystem_setup(); 438 sos_irq_subsystem_setup(); 429 sos_irq_subsystem_setup(); 439 430 440 /* Configure the timer so as to raise the IR 431 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 441 sos_i8254_set_frequency(100); 432 sos_i8254_set_frequency(100); 442 433 443 /* Setup the kernel time subsystem to get pr 434 /* Setup the kernel time subsystem to get prepared to take the timer 444 ticks into account */ 435 ticks into account */ 445 tick_resolution = (struct sos_time) { .sec=0 436 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 446 sos_time_subsysem_setup(& tick_resolution); 437 sos_time_subsysem_setup(& tick_resolution); 447 438 448 /* We need to know the RAM size */ 439 /* We need to know the RAM size */ 449 if (upper_mem == 0) 440 if (upper_mem == 0) 450 { 441 { 451 sos_x86_videomem_putstring(20, 0, 442 sos_x86_videomem_putstring(20, 0, 452 SOS_X86_VIDEO 443 SOS_X86_VIDEO_FG_LTRED 453 | SOS_X86_V 444 | SOS_X86_VIDEO_BG_BLUE 454 | SOS_X86_V 445 | SOS_X86_VIDEO_FG_BLINKING, 455 "I don't know 446 "I don't know RAM size ! Load me with Grub..."); 456 /* STOP ! */ 447 /* STOP ! */ 457 for (;;) 448 for (;;) 458 continue; 449 continue; 459 } 450 } 460 451 461 /* 452 /* 462 * Some interrupt handlers 453 * Some interrupt handlers 463 */ 454 */ 464 455 465 /* Binding some HW interrupts and exceptions 456 /* Binding some HW interrupts and exceptions to software routines */ 466 sos_irq_set_routine(SOS_IRQ_TIMER, 457 sos_irq_set_routine(SOS_IRQ_TIMER, 467 clk_it); 458 clk_it); 468 459 469 /* 460 /* 470 * Setup physical memory management 461 * Setup physical memory management 471 */ 462 */ 472 463 473 SOS_ASSERT_FATAL(SOS_OK 464 SOS_ASSERT_FATAL(SOS_OK 474 == sos_physmem_subsystem_se 465 == sos_physmem_subsystem_setup((upper_mem<<10) + (1<<20), 475 466 &sos_kernel_core_base_paddr, 476 467 &sos_kernel_core_top_paddr)); 477 468 478 /* 469 /* 479 * Switch to paged-memory mode 470 * Switch to paged-memory mode 480 */ 471 */ 481 472 482 /* Disabling interrupts should seem more cor 473 /* Disabling interrupts should seem more correct, but it's not really 483 necessary at this stage */ 474 necessary at this stage */ 484 SOS_ASSERT_FATAL(SOS_OK == 475 SOS_ASSERT_FATAL(SOS_OK == 485 sos_paging_subsystem_setup( 476 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 486 477 sos_kernel_core_top_paddr)); 487 478 488 /* Bind the page fault exception */ 479 /* Bind the page fault exception */ 489 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 480 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 490 pgflt_ex); 481 pgflt_ex); 491 482 492 /* 483 /* 493 * Setup kernel virtual memory allocator 484 * Setup kernel virtual memory allocator 494 */ 485 */ 495 486 496 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 487 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 497 sos_kernel_ 488 sos_kernel_core_top_paddr, 498 bootstrap_s 489 bootstrap_stack_bottom, 499 bootstrap_s 490 bootstrap_stack_bottom 500 + bootstrap 491 + bootstrap_stack_size)) 501 sos_bochs_printf("Could not setup the Kern 492 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 502 493 503 if (sos_kmalloc_subsystem_setup()) 494 if (sos_kmalloc_subsystem_setup()) 504 sos_bochs_printf("Could not setup the Kmal 495 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 505 496 506 /* 497 /* 507 * Initialize the MMU context subsystem 498 * Initialize the MMU context subsystem 508 */ 499 */ 509 sos_mm_context_subsystem_setup(); 500 sos_mm_context_subsystem_setup(); 510 501 511 /* 502 /* 512 * Initialize the CPU context subsystem 503 * Initialize the CPU context subsystem 513 */ 504 */ 514 sos_cpu_context_subsystem_setup(); 505 sos_cpu_context_subsystem_setup(); 515 506 516 /* 507 /* 517 * Bind the syscall handler to its software 508 * Bind the syscall handler to its software interrupt handler 518 */ 509 */ 519 sos_swintr_subsystem_setup(); 510 sos_swintr_subsystem_setup(); 520 511 521 512 522 /* 513 /* 523 * Initialize the Kernel thread and schedule 514 * Initialize the Kernel thread and scheduler subsystems 524 */ 515 */ 525 516 526 /* Initialize kernel thread subsystem */ 517 /* Initialize kernel thread subsystem */ 527 sos_thread_subsystem_setup(bootstrap_stack_b 518 sos_thread_subsystem_setup(bootstrap_stack_bottom, 528 bootstrap_stack_s 519 bootstrap_stack_size); 529 520 530 /* Initialize the scheduler */ 521 /* Initialize the scheduler */ 531 sos_sched_subsystem_setup(); 522 sos_sched_subsystem_setup(); 532 523 533 /* Declare the IDLE thread */ 524 /* Declare the IDLE thread */ 534 SOS_ASSERT_FATAL(sos_create_kernel_thread("i 525 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, 535 SO 526 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 536 527 537 /* Prepare the stats subsystem */ 528 /* Prepare the stats subsystem */ 538 sos_load_subsystem_setup(); 529 sos_load_subsystem_setup(); 539 530 540 /* Declare a thread that prints some stats * 531 /* Declare a thread that prints some stats */ 541 SOS_ASSERT_FATAL(sos_create_kernel_thread("s 532 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, 542 NU 533 NULL, 543 SO 534 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 544 535 545 536 546 /* 537 /* 547 * Initialise user address space management 538 * Initialise user address space management subsystem 548 */ 539 */ 549 sos_umem_vmm_subsystem_setup(); 540 sos_umem_vmm_subsystem_setup(); 550 sos_dev_zero_subsystem_setup(); 541 sos_dev_zero_subsystem_setup(); 551 sos_dev_mem_chardev_setup(); << 552 542 553 /* 543 /* 554 * Initialize process stuff 544 * Initialize process stuff 555 */ 545 */ 556 sos_process_subsystem_setup(); 546 sos_process_subsystem_setup(); 557 547 558 548 559 /* Enabling the HW interrupts here, this wil 549 /* Enabling the HW interrupts here, this will make the timer HW 560 interrupt call the scheduler */ 550 interrupt call the scheduler */ 561 asm volatile ("sti\n"); 551 asm volatile ("sti\n"); 562 552 563 553 564 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_sub 554 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_subsystem_setup()); 565 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_ 555 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_setup(NULL, 566 556 "virtfs", 567 557 NULL, 568 558 & rootfs)); 569 << 570 << 571 tty_subsystem_setup(); << 572 sos_ttyS0_subsystem_setup(); << 573 sos_console_subsystem_setup(); << 574 << 575 << 576 559 577 560 578 /* Start the 'init' process, which in turns 561 /* Start the 'init' process, which in turns launches the other 579 programs */ 562 programs */ 580 start_init(rootfs); 563 start_init(rootfs); 581 /* 564 /* 582 * We can safely exit from this function now 565 * We can safely exit from this function now, for there is already 583 * an idle Kernel thread ready to make the C 566 * an idle Kernel thread ready to make the CPU busy working... 584 * 567 * 585 * However, we must EXPLICITELY call sos_thr 568 * However, we must EXPLICITELY call sos_thread_exit() because a 586 * simple "return" will return nowhere ! Act 569 * simple "return" will return nowhere ! Actually this first thread 587 * was initialized by the Grub bootstrap sta 570 * was initialized by the Grub bootstrap stage, at a time when the 588 * word "thread" did not exist. This means t 571 * word "thread" did not exist. This means that the stack was not 589 * setup in order for a return here to call 572 * setup in order for a return here to call sos_thread_exit() 590 * automagically. Hence we must call it manu 573 * automagically. Hence we must call it manually. This is the ONLY 591 * kernel thread where we must do this manua 574 * kernel thread where we must do this manually. 592 */ 575 */ 593 sos_bochs_printf("Bye from primary thread !\ 576 sos_bochs_printf("Bye from primary thread !\n"); 594 sos_thread_exit(); 577 sos_thread_exit(); 595 SOS_FATAL_ERROR("No trespassing !"); 578 SOS_FATAL_ERROR("No trespassing !"); 596 } 579 }
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