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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> 049 #include <drivers/devices.h> 050 #include <drivers/mem.h> 050 #include <drivers/mem.h> 051 #include <drivers/tty.h> 051 #include <drivers/tty.h> 052 #include <drivers/console.h> 052 #include <drivers/console.h> 053 #include <drivers/serial.h> 053 #include <drivers/serial.h> 054 #include <sos/blkdev.h> << 055 #include <sos/fs_pagecache.h> << 056 #include <drivers/ide.h> << 057 054 058 /* Helper function to display each bits of a 3 055 /* Helper function to display each bits of a 32bits integer on the 059 screen as dark or light carrets */ 056 screen as dark or light carrets */ 060 void display_bits(unsigned char row, unsigned 057 void display_bits(unsigned char row, unsigned char col, 061 unsigned char attribute, 058 unsigned char attribute, 062 sos_ui32_t integer) 059 sos_ui32_t integer) 063 { 060 { 064 int i; 061 int i; 065 /* Scan each bit of the integer, MSb first * 062 /* Scan each bit of the integer, MSb first */ 066 for (i = 31 ; i >= 0 ; i--) 063 for (i = 31 ; i >= 0 ; i--) 067 { 064 { 068 /* Test if bit i of 'integer' is set */ 065 /* Test if bit i of 'integer' is set */ 069 int bit_i = (integer & (1 << i)); 066 int bit_i = (integer & (1 << i)); 070 /* Ascii 219 => dark carret, Ascii 177 = 067 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 071 unsigned char ascii_code = bit_i?219:177 068 unsigned char ascii_code = bit_i?219:177; 072 sos_x86_videomem_putchar(row, col++, 069 sos_x86_videomem_putchar(row, col++, 073 attribute, 070 attribute, 074 ascii_code); 071 ascii_code); 075 } 072 } 076 } 073 } 077 074 078 /* Clock IRQ handler */ 075 /* Clock IRQ handler */ 079 static void clk_it(int intid) 076 static void clk_it(int intid) 080 { 077 { 081 static sos_ui32_t clock_count = 0; 078 static sos_ui32_t clock_count = 0; 082 079 083 display_bits(0, 48, 080 display_bits(0, 48, 084 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 081 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 085 clock_count); 082 clock_count); 086 clock_count++; 083 clock_count++; 087 084 088 /* Execute the expired timeout actions (if a 085 /* Execute the expired timeout actions (if any) */ 089 sos_time_do_tick(); 086 sos_time_do_tick(); 090 087 091 /* Update scheduler statistics and status */ 088 /* Update scheduler statistics and status */ 092 sos_sched_do_timer_tick(); 089 sos_sched_do_timer_tick(); 093 } 090 } 094 091 095 092 096 /* =========================================== 093 /* ====================================================================== 097 * Page fault exception handling 094 * Page fault exception handling 098 */ 095 */ 099 096 100 097 101 /* Page fault exception handler with demand pa 098 /* Page fault exception handler with demand paging for the kernel */ 102 static void pgflt_ex(int intid, struct sos_cpu 099 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 103 { 100 { 104 static sos_ui32_t demand_paging_count = 0; 101 static sos_ui32_t demand_paging_count = 0; 105 struct sos_thread * cur_thr = sos_thread_get 102 struct sos_thread * cur_thr = sos_thread_get_current(); 106 sos_vaddr_t faulting_vaddr = sos_cpu_contex 103 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 107 sos_paddr_t ppage_paddr; 104 sos_paddr_t ppage_paddr; 108 105 109 if (sos_cpu_context_is_in_user_mode(ctxt) 106 if (sos_cpu_context_is_in_user_mode(ctxt) 110 || (cur_thr->fixup_uaccess.return_vaddr) 107 || (cur_thr->fixup_uaccess.return_vaddr)) 111 { 108 { 112 __label__ unforce_address_space; 109 __label__ unforce_address_space; 113 sos_bool_t need_to_setup_mmu; 110 sos_bool_t need_to_setup_mmu; 114 sos_ui32_t errcode = sos_cpu_context_get 111 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); 115 112 116 /* Make sure to always stay in the inter 113 /* Make sure to always stay in the interrupted thread's MMU 117 configuration */ 114 configuration */ 118 need_to_setup_mmu = (cur_thr->squatted_m 115 need_to_setup_mmu = (cur_thr->squatted_mm_context 119 != sos_process_get_ 116 != sos_process_get_mm_context(cur_thr->process)); 120 if (need_to_setup_mmu) 117 if (need_to_setup_mmu) 121 sos_thread_prepare_user_space_access(N 118 sos_thread_prepare_user_space_access(NULL, 0); 122 119 123 if (SOS_OK == 120 if (SOS_OK == 124 sos_umem_vmm_try_resolve_page_fault( 121 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, 125 122 errcode & (1 << 1), 126 123 TRUE)) 127 goto unforce_address_space; 124 goto unforce_address_space; 128 125 129 /* If the page fault occured in kernel m 126 /* If the page fault occured in kernel mode, return to kernel to 130 the fixup address */ 127 the fixup address */ 131 if (! sos_cpu_context_is_in_user_mode(ct 128 if (! sos_cpu_context_is_in_user_mode(ctxt)) 132 { 129 { 133 cur_thr->fixup_uaccess.faulted_uaddr 130 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; 134 sos_cpu_context_set_EX_return_addres 131 sos_cpu_context_set_EX_return_address(ctxt, 135 132 cur_thr->fixup_uaccess.return_vaddr); 136 goto unforce_address_space; 133 goto unforce_address_space; 137 } 134 } 138 135 139 if (need_to_setup_mmu) 136 if (need_to_setup_mmu) 140 sos_thread_end_user_space_access(); 137 sos_thread_end_user_space_access(); 141 138 142 sos_bochs_printf("\e[35mTHR %p: Unresolv !! 139 sos_bochs_printf("Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\n", 143 (void*)sos_thread_get_c << 144 sos_cpu_context_get_PC( 140 sos_cpu_context_get_PC(ctxt), 145 (unsigned)faulting_vadd 141 (unsigned)faulting_vaddr, 146 (unsigned)sos_cpu_conte 142 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 147 sos_bochs_printf("Terminating User threa 143 sos_bochs_printf("Terminating User thread\n"); 148 sos_thread_exit(); 144 sos_thread_exit(); 149 145 150 unforce_address_space: 146 unforce_address_space: 151 if (need_to_setup_mmu) 147 if (need_to_setup_mmu) 152 sos_thread_end_user_space_access(); 148 sos_thread_end_user_space_access(); 153 return; 149 return; 154 } 150 } 155 151 156 /* Check if address is covered by any VMM ra 152 /* Check if address is covered by any VMM range */ 157 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 153 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 158 { 154 { 159 /* No: The page fault is out of any kern 155 /* No: The page fault is out of any kernel virtual region. For 160 the moment, we don't handle this. */ 156 the moment, we don't handle this. */ 161 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)!", 162 sos_cpu_context_ 158 sos_cpu_context_get_PC(ctxt), 163 (unsigned)faulti 159 (unsigned)faulting_vaddr, 164 (unsigned)sos_cp 160 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 165 SOS_ASSERT_FATAL(! "Got page fault (note 161 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 166 } 162 } 167 163 168 164 169 /* 165 /* 170 * Demand paging in kernel space 166 * Demand paging in kernel space 171 */ 167 */ 172 168 173 /* Update the number of demand paging reques 169 /* Update the number of demand paging requests handled */ 174 demand_paging_count ++; 170 demand_paging_count ++; 175 display_bits(0, 0, 171 display_bits(0, 0, 176 SOS_X86_VIDEO_FG_LTRED | SOS_X8 172 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 177 demand_paging_count); 173 demand_paging_count); 178 174 179 /* Allocate a new page for the virtual addre 175 /* Allocate a new page for the virtual address */ 180 ppage_paddr = sos_physmem_ref_physpage_new(F 176 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 181 if (! ppage_paddr) 177 if (! ppage_paddr) 182 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 !)"); 183 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 179 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 184 SO 180 SOS_PAGE_ALIGN_INF(faulting_vaddr), 185 FA 181 FALSE, 186 SO 182 SOS_VM_MAP_PROT_READ 187 | 183 | SOS_VM_MAP_PROT_WRITE 188 | 184 | SOS_VM_MAP_ATOMIC)); 189 sos_physmem_unref_physpage(ppage_paddr); 185 sos_physmem_unref_physpage(ppage_paddr); 190 186 191 /* Ok, we can now return to interrupted cont 187 /* Ok, we can now return to interrupted context */ 192 } 188 } 193 189 194 190 195 191 196 /* =========================================== 192 /* ====================================================================== 197 * An operating system MUST always have a read 193 * An operating system MUST always have a ready thread ! Otherwise: 198 * what would the CPU have to execute ?! 194 * what would the CPU have to execute ?! 199 */ 195 */ 200 static void idle_thread(void* unused) __attrib !! 196 static void idle_thread() 201 static void idle_thread(void* unused) << 202 { 197 { 203 sos_ui32_t idle_twiddle = 0; 198 sos_ui32_t idle_twiddle = 0; 204 199 205 while (1) 200 while (1) 206 { 201 { 207 /* Remove this instruction if you get an 202 /* Remove this instruction if you get an "Invalid opcode" CPU 208 exception (old 80386 CPU) */ 203 exception (old 80386 CPU) */ 209 asm("hlt\n"); 204 asm("hlt\n"); 210 205 211 idle_twiddle ++; 206 idle_twiddle ++; 212 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE 207 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 213 idle_twiddle); 208 idle_twiddle); 214 209 215 /* Lend the CPU to some other thread */ 210 /* Lend the CPU to some other thread */ 216 sos_thread_yield(); 211 sos_thread_yield(); 217 } 212 } 218 } 213 } 219 214 220 215 221 /* =========================================== 216 /* ====================================================================== 222 * Kernel thread showing some CPU usage statis 217 * Kernel thread showing some CPU usage statistics on the console every 1s 223 */ 218 */ 224 #define LOAD_DISPLAY_BASELINE 4 219 #define LOAD_DISPLAY_BASELINE 4 225 #define LOAD_DISPLAY_STARTROW 34 220 #define LOAD_DISPLAY_STARTROW 34 226 static void stat_thread(void * unused) __attri !! 221 static void stat_thread() 227 static void stat_thread(void * unused) << 228 { 222 { 229 while (1) 223 while (1) 230 { 224 { 231 sos_ui32_t flags; 225 sos_ui32_t flags; 232 sos_ui32_t load1, load5, load15; 226 sos_ui32_t load1, load5, load15; 233 char str1[11], str5[11], str15[11]; 227 char str1[11], str5[11], str15[11]; 234 struct sos_time t; 228 struct sos_time t; 235 t.sec = 1; 229 t.sec = 1; 236 t.nanosec = 0; 230 t.nanosec = 0; 237 231 238 sos_thread_sleep(& t); 232 sos_thread_sleep(& t); 239 233 240 sos_disable_IRQs(flags); 234 sos_disable_IRQs(flags); 241 235 242 /* The IDLE task is EXcluded in the foll 236 /* The IDLE task is EXcluded in the following computation */ 243 sos_load_get_sload(&load1, &load5, &load 237 sos_load_get_sload(&load1, &load5, &load15); 244 sos_load_to_string(str1, load1); 238 sos_load_to_string(str1, load1); 245 sos_load_to_string(str5, load5); 239 sos_load_to_string(str5, load5); 246 sos_load_to_string(str15, load15); 240 sos_load_to_string(str15, load15); 247 sos_x86_videomem_printf(LOAD_DISPLAY_BAS 241 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+0, LOAD_DISPLAY_STARTROW, 248 SOS_X86_VIDEO_FG 242 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 249 "Kernel (- Idle) 243 "Kernel (- Idle): %s %s %s ", 250 str1, str5, str1 244 str1, str5, str15); 251 245 252 sos_load_get_uload(&load1, &load5, &load 246 sos_load_get_uload(&load1, &load5, &load15); 253 sos_load_to_string(str1, load1); 247 sos_load_to_string(str1, load1); 254 sos_load_to_string(str5, load5); 248 sos_load_to_string(str5, load5); 255 sos_load_to_string(str15, load15); 249 sos_load_to_string(str15, load15); 256 sos_x86_videomem_printf(LOAD_DISPLAY_BAS 250 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+1, LOAD_DISPLAY_STARTROW, 257 SOS_X86_VIDEO_FG 251 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 258 "User: %s %s %s 252 "User: %s %s %s ", 259 str1, str5, str1 253 str1, str5, str15); 260 254 261 sos_load_get_uratio(&load1, &load5, &loa 255 sos_load_get_uratio(&load1, &load5, &load15); 262 sos_load_to_string(str1, load1); 256 sos_load_to_string(str1, load1); 263 sos_load_to_string(str5, load5); 257 sos_load_to_string(str5, load5); 264 sos_load_to_string(str15, load15); 258 sos_load_to_string(str15, load15); 265 sos_x86_videomem_printf(LOAD_DISPLAY_BAS 259 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+2, LOAD_DISPLAY_STARTROW, 266 SOS_X86_VIDEO_FG 260 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 267 "User CPU %%: %s 261 "User CPU %%: %s %s %s ", 268 str1, str5, str1 262 str1, str5, str15); 269 263 270 /* The IDLE task is INcluded in the foll 264 /* The IDLE task is INcluded in the following computation */ 271 sos_load_get_sratio(&load1, &load5, &loa 265 sos_load_get_sratio(&load1, &load5, &load15); 272 sos_load_to_string(str1, load1); 266 sos_load_to_string(str1, load1); 273 sos_load_to_string(str5, load5); 267 sos_load_to_string(str5, load5); 274 sos_load_to_string(str15, load15); 268 sos_load_to_string(str15, load15); 275 sos_x86_videomem_printf(LOAD_DISPLAY_BAS 269 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+3, LOAD_DISPLAY_STARTROW, 276 SOS_X86_VIDEO_FG 270 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 277 "Kernel CPU %% ( 271 "Kernel CPU %% (+ Idle): %s %s %s ", 278 str1, str5, str1 272 str1, str5, str15); 279 sos_restore_IRQs(flags); 273 sos_restore_IRQs(flags); 280 } 274 } 281 } 275 } 282 276 283 277 284 /* =========================================== 278 /* ====================================================================== 285 * Start the "init" (userland) process 279 * Start the "init" (userland) process 286 */ 280 */ 287 static sos_ret_t 281 static sos_ret_t 288 start_init(struct sos_fs_manager_instance * ro 282 start_init(struct sos_fs_manager_instance * rootfs) 289 { 283 { 290 sos_ret_t retval; 284 sos_ret_t retval; 291 struct sos_umem_vmm_as *as_init; 285 struct sos_umem_vmm_as *as_init; 292 struct sos_process *proc_init; 286 struct sos_process *proc_init; 293 struct sos_thread *new_thr; 287 struct sos_thread *new_thr; 294 sos_uaddr_t ustack, start_uaddr; 288 sos_uaddr_t ustack, start_uaddr; 295 struct sos_fs_opened_file * init_root, * ini 289 struct sos_fs_opened_file * init_root, * init_cwd, * unused_of; 296 290 297 /* Create the new process */ 291 /* Create the new process */ 298 proc_init = sos_process_create("init", FALSE 292 proc_init = sos_process_create("init", FALSE); 299 if (! proc_init) 293 if (! proc_init) 300 return -SOS_ENOMEM; 294 return -SOS_ENOMEM; 301 as_init = sos_process_get_address_space(proc 295 as_init = sos_process_get_address_space(proc_init); 302 296 303 297 304 /* 298 /* 305 * Setup the root and CWD directories of the 299 * Setup the root and CWD directories of the process. The root of 306 * this process will correspond to the "glob 300 * this process will correspond to the "global" root of the whole 307 * system since all the future processes wil 301 * system since all the future processes will duplicate it ! 308 */ 302 */ 309 retval = sos_fs_new_opened_file(proc_init, r 303 retval = sos_fs_new_opened_file(proc_init, rootfs->root, 310 SOS_FS_OPEN_ 304 SOS_FS_OPEN_READ | SOS_FS_OPEN_WRITE, 311 & init_root) 305 & init_root); 312 if (SOS_OK != retval) 306 if (SOS_OK != retval) 313 { 307 { 314 sos_process_unref(proc_init); 308 sos_process_unref(proc_init); 315 return -SOS_ENOENT; 309 return -SOS_ENOENT; 316 } 310 } 317 311 318 /* Duplicate the root file to set the curren 312 /* Duplicate the root file to set the current working directory of 319 the init process */ 313 the init process */ 320 retval = sos_fs_duplicate_opened_file(init_r 314 retval = sos_fs_duplicate_opened_file(init_root, proc_init, 321 & init 315 & init_cwd); 322 if (SOS_OK != retval) 316 if (SOS_OK != retval) 323 { 317 { 324 sos_fs_close(init_root); 318 sos_fs_close(init_root); 325 sos_process_unref(proc_init); 319 sos_process_unref(proc_init); 326 return -SOS_ENOENT; 320 return -SOS_ENOENT; 327 } 321 } 328 322 329 /* Now update the process ! */ 323 /* Now update the process ! */ 330 if ( ( SOS_OK != sos_process_chroot(proc_ini 324 if ( ( SOS_OK != sos_process_chroot(proc_init, init_root, & unused_of) ) 331 || ( SOS_OK != sos_process_chdir(proc_i 325 || ( SOS_OK != sos_process_chdir(proc_init, init_cwd, & unused_of) ) ) 332 { 326 { 333 sos_fs_close(init_root); 327 sos_fs_close(init_root); 334 sos_fs_close(init_cwd); 328 sos_fs_close(init_cwd); 335 sos_process_chroot(proc_init, NULL, & un 329 sos_process_chroot(proc_init, NULL, & unused_of); 336 sos_process_chdir(proc_init, NULL, & unu 330 sos_process_chdir(proc_init, NULL, & unused_of); 337 sos_process_unref(proc_init); 331 sos_process_unref(proc_init); 338 return -SOS_ENOENT; 332 return -SOS_ENOENT; 339 } 333 } 340 334 341 335 342 336 343 /* Map the 'init' program in user space */ 337 /* Map the 'init' program in user space */ 344 start_uaddr = sos_binfmt_elf32_map(as_init, 338 start_uaddr = sos_binfmt_elf32_map(as_init, "init"); 345 if (0 == start_uaddr) 339 if (0 == start_uaddr) 346 { 340 { 347 sos_process_unref(proc_init); 341 sos_process_unref(proc_init); 348 return -SOS_ENOENT; 342 return -SOS_ENOENT; 349 } 343 } 350 344 351 /* Allocate the user stack */ 345 /* Allocate the user stack */ 352 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ 346 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; 353 retval = sos_dev_zero_map(as_init, &ustack, 347 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, 354 SOS_VM_MAP_PROT_RE 348 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, 355 /* PRIVATE */ 0); 349 /* PRIVATE */ 0); 356 if (SOS_OK != retval) 350 if (SOS_OK != retval) 357 { 351 { 358 sos_process_unref(proc_init); 352 sos_process_unref(proc_init); 359 return -SOS_ENOMEM; 353 return -SOS_ENOMEM; 360 } 354 } 361 355 362 /* Now create the user thread */ 356 /* Now create the user thread */ 363 new_thr = sos_create_user_thread(NULL, 357 new_thr = sos_create_user_thread(NULL, 364 proc_init, 358 proc_init, 365 start_uaddr 359 start_uaddr, 366 0, 0, 360 0, 0, 367 ustack + SO 361 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, 368 SOS_SCHED_P 362 SOS_SCHED_PRIO_TS_LOWEST); 369 if (! new_thr) 363 if (! new_thr) 370 { 364 { 371 sos_process_unref(proc_init); 365 sos_process_unref(proc_init); 372 return -SOS_ENOMEM; 366 return -SOS_ENOMEM; 373 } 367 } 374 368 375 sos_process_unref(proc_init); 369 sos_process_unref(proc_init); 376 return SOS_OK; 370 return SOS_OK; 377 } 371 } 378 372 379 373 380 << 381 /* =========================================== 374 /* ====================================================================== 382 * The C entry point of our operating system 375 * The C entry point of our operating system 383 */ 376 */ 384 void sos_main(unsigned long magic, unsigned lo 377 void sos_main(unsigned long magic, unsigned long arg) 385 __attribute__((noreturn)); << 386 void sos_main(unsigned long magic, unsigned lo << 387 { 378 { >> 379 unsigned i; 388 sos_paddr_t sos_kernel_core_base_paddr, sos_ 380 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 389 struct sos_time tick_resolution; 381 struct sos_time tick_resolution; 390 struct sos_fs_manager_instance * rootfs; 382 struct sos_fs_manager_instance * rootfs; 391 383 392 /* Size of RAM above 1MB. Might be undefined 384 /* Size of RAM above 1MB. Might be undefined ! */ 393 unsigned long int upper_mem = 0; 385 unsigned long int upper_mem = 0; 394 386 395 /* Setup bochs and console, and clear the co 387 /* Setup bochs and console, and clear the console */ 396 sos_bochs_subsystem_setup(); 388 sos_bochs_subsystem_setup(); 397 389 398 sos_x86_videomem_setup(); 390 sos_x86_videomem_setup(); 399 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 391 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 400 392 401 /* Greetings from SOS */ 393 /* Greetings from SOS */ 402 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 394 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 403 { 395 { 404 /* Grub sends us a structure, called mul 396 /* Grub sends us a structure, called multiboot_info_t with a lot of 405 precious informations about the syste 397 precious informations about the system, see the multiboot 406 documentation for more information. * 398 documentation for more information. */ 407 multiboot_info_t *mbi = (multiboot_info_ 399 multiboot_info_t *mbi = (multiboot_info_t *) arg; 408 400 409 /* Multiboot says: "The value returned f 401 /* Multiboot says: "The value returned for upper memory is 410 maximally the address of the first up 402 maximally the address of the first upper memory hole minus 1 411 megabyte.". It also adds: "It is not 403 megabyte.". It also adds: "It is not guaranteed to be this 412 value." aka "YMMV" ;) */ 404 value." aka "YMMV" ;) */ 413 upper_mem = mbi->mem_upper; 405 upper_mem = mbi->mem_upper; 414 sos_x86_videomem_printf(1, 0, 406 sos_x86_videomem_printf(1, 0, 415 SOS_X86_VIDEO_FG 407 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 416 "Welcome From GR 408 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 417 "SOS article 9.5 !! 409 "SOS article 9", ',', 418 (unsigned)(upper 410 (unsigned)(upper_mem >> 10) + 1, 419 (unsigned)upper_ 411 (unsigned)upper_mem); 420 } 412 } 421 else if (magic == 0x42244224) 413 else if (magic == 0x42244224) 422 { 414 { 423 /* Loaded with SOS bootsect */ 415 /* Loaded with SOS bootsect */ 424 upper_mem = arg; 416 upper_mem = arg; 425 sos_x86_videomem_printf(1, 0, 417 sos_x86_videomem_printf(1, 0, 426 SOS_X86_VIDEO_FG 418 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 427 "Welcome to %s%c 419 "Welcome to %s%c RAM is %dMB (upper mem = 0x%x kB)", 428 "SOS article 9.5 !! 420 "SOS article 9", ',', 429 (unsigned)(upper 421 (unsigned)(upper_mem >> 10) + 1, 430 (unsigned)upper_ 422 (unsigned)upper_mem); 431 } 423 } 432 else 424 else 433 /* Not loaded with grub, not from an enhan 425 /* Not loaded with grub, not from an enhanced bootsect */ 434 sos_x86_videomem_printf(1, 0, 426 sos_x86_videomem_printf(1, 0, 435 SOS_X86_VIDEO_FG_Y 427 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 436 "Welcome to SOS ar !! 428 "Welcome to SOS article 9"); 437 429 438 sos_bochs_putstring("Message in a bochs: Thi !! 430 sos_bochs_putstring("Message in a bochs: This is SOS article 9.\n"); 439 431 440 /* Setup CPU segmentation and IRQ subsystem 432 /* Setup CPU segmentation and IRQ subsystem */ 441 sos_gdt_subsystem_setup(); 433 sos_gdt_subsystem_setup(); 442 sos_idt_subsystem_setup(); 434 sos_idt_subsystem_setup(); 443 435 444 /* Setup SOS IRQs and exceptions subsystem * 436 /* Setup SOS IRQs and exceptions subsystem */ 445 sos_exception_subsystem_setup(); 437 sos_exception_subsystem_setup(); 446 sos_irq_subsystem_setup(); 438 sos_irq_subsystem_setup(); 447 439 448 /* Configure the timer so as to raise the IR 440 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 449 sos_i8254_set_frequency(100); 441 sos_i8254_set_frequency(100); 450 442 451 /* Setup the kernel time subsystem to get pr 443 /* Setup the kernel time subsystem to get prepared to take the timer 452 ticks into account */ 444 ticks into account */ 453 tick_resolution = (struct sos_time) { .sec=0 445 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 454 sos_time_subsysem_setup(& tick_resolution); 446 sos_time_subsysem_setup(& tick_resolution); 455 447 456 /* We need to know the RAM size */ 448 /* We need to know the RAM size */ 457 if (upper_mem == 0) 449 if (upper_mem == 0) 458 { 450 { 459 sos_x86_videomem_putstring(20, 0, 451 sos_x86_videomem_putstring(20, 0, 460 SOS_X86_VIDEO 452 SOS_X86_VIDEO_FG_LTRED 461 | SOS_X86_V 453 | SOS_X86_VIDEO_BG_BLUE 462 | SOS_X86_V 454 | SOS_X86_VIDEO_FG_BLINKING, 463 "I don't know 455 "I don't know RAM size ! Load me with Grub..."); 464 /* STOP ! */ 456 /* STOP ! */ 465 for (;;) 457 for (;;) 466 continue; 458 continue; 467 } 459 } 468 460 469 /* 461 /* 470 * Some interrupt handlers 462 * Some interrupt handlers 471 */ 463 */ 472 464 473 /* Binding some HW interrupts and exceptions 465 /* Binding some HW interrupts and exceptions to software routines */ 474 sos_irq_set_routine(SOS_IRQ_TIMER, 466 sos_irq_set_routine(SOS_IRQ_TIMER, 475 clk_it); 467 clk_it); 476 468 477 /* 469 /* 478 * Setup physical memory management 470 * Setup physical memory management 479 */ 471 */ 480 472 481 SOS_ASSERT_FATAL(SOS_OK 473 SOS_ASSERT_FATAL(SOS_OK 482 == sos_physmem_subsystem_se 474 == sos_physmem_subsystem_setup((upper_mem<<10) + (1<<20), 483 475 &sos_kernel_core_base_paddr, 484 476 &sos_kernel_core_top_paddr)); 485 477 486 /* 478 /* 487 * Switch to paged-memory mode 479 * Switch to paged-memory mode 488 */ 480 */ 489 481 490 /* Disabling interrupts should seem more cor 482 /* Disabling interrupts should seem more correct, but it's not really 491 necessary at this stage */ 483 necessary at this stage */ 492 SOS_ASSERT_FATAL(SOS_OK == 484 SOS_ASSERT_FATAL(SOS_OK == 493 sos_paging_subsystem_setup( 485 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 494 486 sos_kernel_core_top_paddr)); 495 487 496 /* Bind the page fault exception */ 488 /* Bind the page fault exception */ 497 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 489 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 498 pgflt_ex); 490 pgflt_ex); 499 491 500 /* 492 /* 501 * Setup kernel virtual memory allocator 493 * Setup kernel virtual memory allocator 502 */ 494 */ 503 495 504 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 496 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 505 sos_kernel_ 497 sos_kernel_core_top_paddr, 506 bootstrap_s 498 bootstrap_stack_bottom, 507 bootstrap_s 499 bootstrap_stack_bottom 508 + bootstrap 500 + bootstrap_stack_size)) 509 sos_bochs_printf("Could not setup the Kern 501 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 510 502 511 if (sos_kmalloc_subsystem_setup()) 503 if (sos_kmalloc_subsystem_setup()) 512 sos_bochs_printf("Could not setup the Kmal 504 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 513 505 514 /* 506 /* 515 * Initialize the MMU context subsystem 507 * Initialize the MMU context subsystem 516 */ 508 */ 517 sos_mm_context_subsystem_setup(); 509 sos_mm_context_subsystem_setup(); 518 510 519 /* 511 /* 520 * Initialize the CPU context subsystem 512 * Initialize the CPU context subsystem 521 */ 513 */ 522 sos_cpu_context_subsystem_setup(); 514 sos_cpu_context_subsystem_setup(); 523 515 524 /* 516 /* 525 * Bind the syscall handler to its software 517 * Bind the syscall handler to its software interrupt handler 526 */ 518 */ 527 sos_swintr_subsystem_setup(); 519 sos_swintr_subsystem_setup(); 528 520 529 521 530 /* 522 /* 531 * Initialize the Kernel thread and schedule 523 * Initialize the Kernel thread and scheduler subsystems 532 */ 524 */ 533 525 534 /* Initialize kernel thread subsystem */ 526 /* Initialize kernel thread subsystem */ 535 sos_thread_subsystem_setup(bootstrap_stack_b 527 sos_thread_subsystem_setup(bootstrap_stack_bottom, 536 bootstrap_stack_s 528 bootstrap_stack_size); 537 529 538 /* Initialize the scheduler */ 530 /* Initialize the scheduler */ 539 sos_sched_subsystem_setup(); 531 sos_sched_subsystem_setup(); 540 532 541 /* Declare the IDLE thread */ 533 /* Declare the IDLE thread */ 542 SOS_ASSERT_FATAL(sos_create_kernel_thread("i 534 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, 543 SO 535 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 544 536 545 /* Prepare the stats subsystem */ 537 /* Prepare the stats subsystem */ 546 sos_load_subsystem_setup(); 538 sos_load_subsystem_setup(); 547 539 548 /* Declare a thread that prints some stats * 540 /* Declare a thread that prints some stats */ 549 SOS_ASSERT_FATAL(sos_create_kernel_thread("s 541 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, 550 NU 542 NULL, 551 SO 543 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 552 544 553 545 554 /* 546 /* 555 * Initialise user address space management 547 * Initialise user address space management subsystem 556 */ 548 */ 557 sos_umem_vmm_subsystem_setup(); 549 sos_umem_vmm_subsystem_setup(); 558 sos_dev_zero_subsystem_setup(); 550 sos_dev_zero_subsystem_setup(); 559 << 560 /* Initialize the page and block cache subsy << 561 sos_fs_pagecache_subsystem_setup(); << 562 sos_blockdev_subsystem_setup(); << 563 sos_dev_mem_chardev_setup(); 551 sos_dev_mem_chardev_setup(); 564 552 565 /* 553 /* 566 * Initialize process stuff 554 * Initialize process stuff 567 */ 555 */ 568 sos_process_subsystem_setup(); 556 sos_process_subsystem_setup(); 569 557 570 558 571 /* Enabling the HW interrupts here, this wil 559 /* Enabling the HW interrupts here, this will make the timer HW 572 interrupt call the scheduler */ 560 interrupt call the scheduler */ 573 asm volatile ("sti\n"); 561 asm volatile ("sti\n"); 574 562 575 563 576 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_sub 564 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_subsystem_setup()); 577 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_ 565 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_setup(NULL, 578 566 "virtfs", 579 567 NULL, 580 568 & rootfs)); 581 569 582 570 583 tty_subsystem_setup(); 571 tty_subsystem_setup(); 584 sos_ttyS0_subsystem_setup(); 572 sos_ttyS0_subsystem_setup(); 585 sos_console_subsystem_setup(); 573 sos_console_subsystem_setup(); 586 574 587 << 588 sos_ide_subsystem_setup(); << 589 575 590 576 591 577 592 /* Start the 'init' process, which in turns 578 /* Start the 'init' process, which in turns launches the other 593 programs */ 579 programs */ 594 start_init(rootfs); 580 start_init(rootfs); 595 /* 581 /* 596 * We can safely exit from this function now 582 * We can safely exit from this function now, for there is already 597 * an idle Kernel thread ready to make the C 583 * an idle Kernel thread ready to make the CPU busy working... 598 * 584 * 599 * However, we must EXPLICITELY call sos_thr 585 * However, we must EXPLICITELY call sos_thread_exit() because a 600 * simple "return" will return nowhere ! Act 586 * simple "return" will return nowhere ! Actually this first thread 601 * was initialized by the Grub bootstrap sta 587 * was initialized by the Grub bootstrap stage, at a time when the 602 * word "thread" did not exist. This means t 588 * word "thread" did not exist. This means that the stack was not 603 * setup in order for a return here to call 589 * setup in order for a return here to call sos_thread_exit() 604 * automagically. Hence we must call it manu 590 * automagically. Hence we must call it manually. This is the ONLY 605 * kernel thread where we must do this manua 591 * kernel thread where we must do this manually. 606 */ 592 */ 607 sos_bochs_printf("Bye from primary thread !\ 593 sos_bochs_printf("Bye from primary thread !\n"); 608 sos_thread_exit(); 594 sos_thread_exit(); 609 SOS_FATAL_ERROR("No trespassing !"); 595 SOS_FATAL_ERROR("No trespassing !"); 610 } 596 }
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