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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 #include <sos/blkdev.h> >> 055 #include <sos/fs_pagecache.h> >> 056 #include <drivers/ide.h> 049 057 050 /* Helper function to display each bits of a 3 058 /* Helper function to display each bits of a 32bits integer on the 051 screen as dark or light carrets */ 059 screen as dark or light carrets */ 052 void display_bits(unsigned char row, unsigned 060 void display_bits(unsigned char row, unsigned char col, 053 unsigned char attribute, 061 unsigned char attribute, 054 sos_ui32_t integer) 062 sos_ui32_t integer) 055 { 063 { 056 int i; 064 int i; 057 /* Scan each bit of the integer, MSb first * 065 /* Scan each bit of the integer, MSb first */ 058 for (i = 31 ; i >= 0 ; i--) 066 for (i = 31 ; i >= 0 ; i--) 059 { 067 { 060 /* Test if bit i of 'integer' is set */ 068 /* Test if bit i of 'integer' is set */ 061 int bit_i = (integer & (1 << i)); 069 int bit_i = (integer & (1 << i)); 062 /* Ascii 219 => dark carret, Ascii 177 = 070 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 063 unsigned char ascii_code = bit_i?219:177 071 unsigned char ascii_code = bit_i?219:177; 064 sos_x86_videomem_putchar(row, col++, 072 sos_x86_videomem_putchar(row, col++, 065 attribute, 073 attribute, 066 ascii_code); 074 ascii_code); 067 } 075 } 068 } 076 } 069 077 070 /* Clock IRQ handler */ 078 /* Clock IRQ handler */ 071 static void clk_it(int intid) 079 static void clk_it(int intid) 072 { 080 { 073 static sos_ui32_t clock_count = 0; 081 static sos_ui32_t clock_count = 0; 074 082 075 display_bits(0, 48, 083 display_bits(0, 48, 076 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 084 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 077 clock_count); 085 clock_count); 078 clock_count++; 086 clock_count++; 079 087 080 /* Execute the expired timeout actions (if a 088 /* Execute the expired timeout actions (if any) */ 081 sos_time_do_tick(); 089 sos_time_do_tick(); 082 090 083 /* Update scheduler statistics and status */ 091 /* Update scheduler statistics and status */ 084 sos_sched_do_timer_tick(); 092 sos_sched_do_timer_tick(); 085 } 093 } 086 094 087 095 088 /* =========================================== 096 /* ====================================================================== 089 * Page fault exception handling 097 * Page fault exception handling 090 */ 098 */ 091 099 092 100 093 /* Page fault exception handler with demand pa 101 /* Page fault exception handler with demand paging for the kernel */ 094 static void pgflt_ex(int intid, struct sos_cpu 102 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 095 { 103 { 096 static sos_ui32_t demand_paging_count = 0; 104 static sos_ui32_t demand_paging_count = 0; 097 struct sos_thread * cur_thr = sos_thread_get 105 struct sos_thread * cur_thr = sos_thread_get_current(); 098 sos_vaddr_t faulting_vaddr = sos_cpu_contex 106 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 099 sos_paddr_t ppage_paddr; 107 sos_paddr_t ppage_paddr; 100 108 101 if (sos_cpu_context_is_in_user_mode(ctxt) 109 if (sos_cpu_context_is_in_user_mode(ctxt) 102 || (cur_thr->fixup_uaccess.return_vaddr) 110 || (cur_thr->fixup_uaccess.return_vaddr)) 103 { 111 { 104 __label__ unforce_address_space; 112 __label__ unforce_address_space; 105 sos_bool_t need_to_setup_mmu; 113 sos_bool_t need_to_setup_mmu; 106 sos_ui32_t errcode = sos_cpu_context_get 114 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); 107 115 108 /* Make sure to always stay in the inter 116 /* Make sure to always stay in the interrupted thread's MMU 109 configuration */ 117 configuration */ 110 need_to_setup_mmu = (cur_thr->squatted_m 118 need_to_setup_mmu = (cur_thr->squatted_mm_context 111 != sos_process_get_ 119 != sos_process_get_mm_context(cur_thr->process)); 112 if (need_to_setup_mmu) 120 if (need_to_setup_mmu) 113 sos_thread_prepare_user_space_access(N 121 sos_thread_prepare_user_space_access(NULL, 0); 114 122 115 if (SOS_OK == 123 if (SOS_OK == 116 sos_umem_vmm_try_resolve_page_fault( 124 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, 117 125 errcode & (1 << 1), 118 126 TRUE)) 119 goto unforce_address_space; 127 goto unforce_address_space; 120 128 121 /* If the page fault occured in kernel m 129 /* If the page fault occured in kernel mode, return to kernel to 122 the fixup address */ 130 the fixup address */ 123 if (! sos_cpu_context_is_in_user_mode(ct 131 if (! sos_cpu_context_is_in_user_mode(ctxt)) 124 { 132 { 125 cur_thr->fixup_uaccess.faulted_uaddr 133 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; 126 sos_cpu_context_set_EX_return_addres 134 sos_cpu_context_set_EX_return_address(ctxt, 127 135 cur_thr->fixup_uaccess.return_vaddr); 128 goto unforce_address_space; 136 goto unforce_address_space; 129 } 137 } 130 138 131 if (need_to_setup_mmu) 139 if (need_to_setup_mmu) 132 sos_thread_end_user_space_access(); 140 sos_thread_end_user_space_access(); 133 141 134 sos_bochs_printf("Unresolved USER page F !! 142 sos_bochs_printf("\e[35mTHR %p: Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\e[m\n", >> 143 (void*)sos_thread_get_current(), 135 sos_cpu_context_get_PC( 144 sos_cpu_context_get_PC(ctxt), 136 (unsigned)faulting_vadd 145 (unsigned)faulting_vaddr, 137 (unsigned)sos_cpu_conte 146 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 138 sos_bochs_printf("Terminating User threa 147 sos_bochs_printf("Terminating User thread\n"); 139 sos_thread_exit(); 148 sos_thread_exit(); 140 149 141 unforce_address_space: 150 unforce_address_space: 142 if (need_to_setup_mmu) 151 if (need_to_setup_mmu) 143 sos_thread_end_user_space_access(); 152 sos_thread_end_user_space_access(); 144 return; 153 return; 145 } 154 } 146 155 147 /* Check if address is covered by any VMM ra 156 /* Check if address is covered by any VMM range */ 148 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 157 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 149 { 158 { 150 /* No: The page fault is out of any kern 159 /* No: The page fault is out of any kernel virtual region. For 151 the moment, we don't handle this. */ 160 the moment, we don't handle this. */ 152 sos_display_fatal_error("Unresolved page 161 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", 153 sos_cpu_context_ 162 sos_cpu_context_get_PC(ctxt), 154 (unsigned)faulti 163 (unsigned)faulting_vaddr, 155 (unsigned)sos_cp 164 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 156 SOS_ASSERT_FATAL(! "Got page fault (note 165 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 157 } 166 } 158 167 159 168 160 /* 169 /* 161 * Demand paging in kernel space 170 * Demand paging in kernel space 162 */ 171 */ 163 172 164 /* Update the number of demand paging reques 173 /* Update the number of demand paging requests handled */ 165 demand_paging_count ++; 174 demand_paging_count ++; 166 display_bits(0, 0, 175 display_bits(0, 0, 167 SOS_X86_VIDEO_FG_LTRED | SOS_X8 176 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 168 demand_paging_count); 177 demand_paging_count); 169 178 170 /* Allocate a new page for the virtual addre 179 /* Allocate a new page for the virtual address */ 171 ppage_paddr = sos_physmem_ref_physpage_new(F 180 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 172 if (! ppage_paddr) 181 if (! ppage_paddr) 173 SOS_ASSERT_FATAL(! "TODO: implement swap. 182 SOS_ASSERT_FATAL(! "TODO: implement swap. (Out of mem in demand paging because no swap for kernel yet !)"); 174 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 183 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 175 SO 184 SOS_PAGE_ALIGN_INF(faulting_vaddr), 176 FA 185 FALSE, 177 SO 186 SOS_VM_MAP_PROT_READ 178 | 187 | SOS_VM_MAP_PROT_WRITE 179 | 188 | SOS_VM_MAP_ATOMIC)); 180 sos_physmem_unref_physpage(ppage_paddr); 189 sos_physmem_unref_physpage(ppage_paddr); 181 190 182 /* Ok, we can now return to interrupted cont 191 /* Ok, we can now return to interrupted context */ 183 } 192 } 184 193 185 194 186 195 187 /* =========================================== 196 /* ====================================================================== 188 * An operating system MUST always have a read 197 * An operating system MUST always have a ready thread ! Otherwise: 189 * what would the CPU have to execute ?! 198 * what would the CPU have to execute ?! 190 */ 199 */ 191 static void idle_thread() !! 200 static void idle_thread(void* unused) __attribute__((noreturn)); >> 201 static void idle_thread(void* unused) 192 { 202 { 193 sos_ui32_t idle_twiddle = 0; 203 sos_ui32_t idle_twiddle = 0; 194 204 195 while (1) 205 while (1) 196 { 206 { 197 /* Remove this instruction if you get an 207 /* Remove this instruction if you get an "Invalid opcode" CPU 198 exception (old 80386 CPU) */ 208 exception (old 80386 CPU) */ 199 asm("hlt\n"); 209 asm("hlt\n"); 200 210 201 idle_twiddle ++; 211 idle_twiddle ++; 202 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE 212 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 203 idle_twiddle); 213 idle_twiddle); 204 214 205 /* Lend the CPU to some other thread */ 215 /* Lend the CPU to some other thread */ 206 sos_thread_yield(); 216 sos_thread_yield(); 207 } 217 } 208 } 218 } 209 219 210 220 211 /* =========================================== 221 /* ====================================================================== 212 * Kernel thread showing some CPU usage statis 222 * Kernel thread showing some CPU usage statistics on the console every 1s 213 */ 223 */ 214 static void stat_thread() !! 224 #define LOAD_DISPLAY_BASELINE 4 >> 225 #define LOAD_DISPLAY_STARTROW 34 >> 226 static void stat_thread(void * unused) __attribute__((noreturn)); >> 227 static void stat_thread(void * unused) 215 { 228 { 216 while (1) 229 while (1) 217 { 230 { 218 sos_ui32_t flags; 231 sos_ui32_t flags; 219 sos_ui32_t load1, load5, load15; 232 sos_ui32_t load1, load5, load15; 220 char str1[11], str5[11], str15[11]; 233 char str1[11], str5[11], str15[11]; 221 struct sos_time t; 234 struct sos_time t; 222 t.sec = 1; 235 t.sec = 1; 223 t.nanosec = 0; 236 t.nanosec = 0; 224 237 225 sos_thread_sleep(& t); 238 sos_thread_sleep(& t); 226 239 227 sos_disable_IRQs(flags); 240 sos_disable_IRQs(flags); 228 241 229 /* The IDLE task is EXcluded in the foll 242 /* The IDLE task is EXcluded in the following computation */ 230 sos_load_get_sload(&load1, &load5, &load 243 sos_load_get_sload(&load1, &load5, &load15); 231 sos_load_to_string(str1, load1); 244 sos_load_to_string(str1, load1); 232 sos_load_to_string(str5, load5); 245 sos_load_to_string(str5, load5); 233 sos_load_to_string(str15, load15); 246 sos_load_to_string(str15, load15); 234 sos_x86_videomem_printf(16, 34, !! 247 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+0, LOAD_DISPLAY_STARTROW, 235 SOS_X86_VIDEO_FG 248 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 236 "Kernel (- Idle) 249 "Kernel (- Idle): %s %s %s ", 237 str1, str5, str1 250 str1, str5, str15); 238 251 239 sos_load_get_uload(&load1, &load5, &load 252 sos_load_get_uload(&load1, &load5, &load15); 240 sos_load_to_string(str1, load1); 253 sos_load_to_string(str1, load1); 241 sos_load_to_string(str5, load5); 254 sos_load_to_string(str5, load5); 242 sos_load_to_string(str15, load15); 255 sos_load_to_string(str15, load15); 243 sos_x86_videomem_printf(17, 34, !! 256 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+1, LOAD_DISPLAY_STARTROW, 244 SOS_X86_VIDEO_FG 257 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 245 "User: %s %s %s 258 "User: %s %s %s ", 246 str1, str5, str1 259 str1, str5, str15); 247 260 248 sos_load_get_uratio(&load1, &load5, &loa 261 sos_load_get_uratio(&load1, &load5, &load15); 249 sos_load_to_string(str1, load1); 262 sos_load_to_string(str1, load1); 250 sos_load_to_string(str5, load5); 263 sos_load_to_string(str5, load5); 251 sos_load_to_string(str15, load15); 264 sos_load_to_string(str15, load15); 252 sos_x86_videomem_printf(18, 34, !! 265 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+2, LOAD_DISPLAY_STARTROW, 253 SOS_X86_VIDEO_FG 266 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 254 "User CPU %%: %s 267 "User CPU %%: %s %s %s ", 255 str1, str5, str1 268 str1, str5, str15); 256 269 257 /* The IDLE task is INcluded in the foll 270 /* The IDLE task is INcluded in the following computation */ 258 sos_load_get_sratio(&load1, &load5, &loa 271 sos_load_get_sratio(&load1, &load5, &load15); 259 sos_load_to_string(str1, load1); 272 sos_load_to_string(str1, load1); 260 sos_load_to_string(str5, load5); 273 sos_load_to_string(str5, load5); 261 sos_load_to_string(str15, load15); 274 sos_load_to_string(str15, load15); 262 sos_x86_videomem_printf(19, 34, !! 275 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+3, LOAD_DISPLAY_STARTROW, 263 SOS_X86_VIDEO_FG 276 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 264 "Kernel CPU %% ( 277 "Kernel CPU %% (+ Idle): %s %s %s ", 265 str1, str5, str1 278 str1, str5, str15); 266 sos_restore_IRQs(flags); 279 sos_restore_IRQs(flags); 267 } 280 } 268 } 281 } 269 282 270 283 271 /* =========================================== 284 /* ====================================================================== 272 * Start the "init" (userland) process 285 * Start the "init" (userland) process 273 */ 286 */ 274 static sos_ret_t 287 static sos_ret_t 275 start_init(struct sos_fs_manager_instance * ro 288 start_init(struct sos_fs_manager_instance * rootfs) 276 { 289 { 277 sos_ret_t retval; 290 sos_ret_t retval; 278 struct sos_umem_vmm_as *as_init; 291 struct sos_umem_vmm_as *as_init; 279 struct sos_process *proc_init; 292 struct sos_process *proc_init; 280 struct sos_thread *new_thr; 293 struct sos_thread *new_thr; 281 sos_uaddr_t ustack, start_uaddr; 294 sos_uaddr_t ustack, start_uaddr; 282 struct sos_fs_opened_file * init_root, * ini 295 struct sos_fs_opened_file * init_root, * init_cwd, * unused_of; 283 296 284 /* Create the new process */ 297 /* Create the new process */ 285 proc_init = sos_process_create("init", FALSE 298 proc_init = sos_process_create("init", FALSE); 286 if (! proc_init) 299 if (! proc_init) 287 return -SOS_ENOMEM; 300 return -SOS_ENOMEM; 288 as_init = sos_process_get_address_space(proc 301 as_init = sos_process_get_address_space(proc_init); 289 302 290 303 291 /* 304 /* 292 * Setup the root and CWD directories of the 305 * Setup the root and CWD directories of the process. The root of 293 * this process will correspond to the "glob 306 * this process will correspond to the "global" root of the whole 294 * system since all the future processes wil 307 * system since all the future processes will duplicate it ! 295 */ 308 */ 296 retval = sos_fs_new_opened_file(proc_init, r 309 retval = sos_fs_new_opened_file(proc_init, rootfs->root, 297 SOS_FS_OPEN_ 310 SOS_FS_OPEN_READ | SOS_FS_OPEN_WRITE, 298 & init_root) 311 & init_root); 299 if (SOS_OK != retval) 312 if (SOS_OK != retval) 300 { 313 { 301 sos_process_unref(proc_init); 314 sos_process_unref(proc_init); 302 return -SOS_ENOENT; 315 return -SOS_ENOENT; 303 } 316 } 304 317 305 /* Duplicate the root file to set the curren 318 /* Duplicate the root file to set the current working directory of 306 the init process */ 319 the init process */ 307 retval = sos_fs_duplicate_opened_file(init_r 320 retval = sos_fs_duplicate_opened_file(init_root, proc_init, 308 & init 321 & init_cwd); 309 if (SOS_OK != retval) 322 if (SOS_OK != retval) 310 { 323 { 311 sos_fs_close(init_root); 324 sos_fs_close(init_root); 312 sos_process_unref(proc_init); 325 sos_process_unref(proc_init); 313 return -SOS_ENOENT; 326 return -SOS_ENOENT; 314 } 327 } 315 328 316 /* Now update the process ! */ 329 /* Now update the process ! */ 317 if ( ( SOS_OK != sos_process_chroot(proc_ini 330 if ( ( SOS_OK != sos_process_chroot(proc_init, init_root, & unused_of) ) 318 || ( SOS_OK != sos_process_chdir(proc_i 331 || ( SOS_OK != sos_process_chdir(proc_init, init_cwd, & unused_of) ) ) 319 { 332 { 320 sos_fs_close(init_root); 333 sos_fs_close(init_root); 321 sos_fs_close(init_cwd); 334 sos_fs_close(init_cwd); 322 sos_process_chroot(proc_init, NULL, & un 335 sos_process_chroot(proc_init, NULL, & unused_of); 323 sos_process_chdir(proc_init, NULL, & unu 336 sos_process_chdir(proc_init, NULL, & unused_of); 324 sos_process_unref(proc_init); 337 sos_process_unref(proc_init); 325 return -SOS_ENOENT; 338 return -SOS_ENOENT; 326 } 339 } 327 340 >> 341 >> 342 328 /* Map the 'init' program in user space */ 343 /* Map the 'init' program in user space */ 329 start_uaddr = sos_binfmt_elf32_map(as_init, 344 start_uaddr = sos_binfmt_elf32_map(as_init, "init"); 330 if (0 == start_uaddr) 345 if (0 == start_uaddr) 331 { 346 { 332 sos_process_unref(proc_init); 347 sos_process_unref(proc_init); 333 return -SOS_ENOENT; 348 return -SOS_ENOENT; 334 } 349 } 335 350 336 /* Allocate the user stack */ 351 /* Allocate the user stack */ 337 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ 352 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; 338 retval = sos_dev_zero_map(as_init, &ustack, 353 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, 339 SOS_VM_MAP_PROT_RE 354 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, 340 /* PRIVATE */ 0); 355 /* PRIVATE */ 0); 341 if (SOS_OK != retval) 356 if (SOS_OK != retval) 342 { 357 { 343 sos_process_unref(proc_init); 358 sos_process_unref(proc_init); 344 return -SOS_ENOMEM; 359 return -SOS_ENOMEM; 345 } 360 } 346 361 347 /* Now create the user thread */ 362 /* Now create the user thread */ 348 new_thr = sos_create_user_thread(NULL, 363 new_thr = sos_create_user_thread(NULL, 349 proc_init, 364 proc_init, 350 start_uaddr 365 start_uaddr, 351 0, 0, 366 0, 0, 352 ustack + SO 367 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, 353 SOS_SCHED_P 368 SOS_SCHED_PRIO_TS_LOWEST); 354 if (! new_thr) 369 if (! new_thr) 355 { 370 { 356 sos_process_unref(proc_init); 371 sos_process_unref(proc_init); 357 return -SOS_ENOMEM; 372 return -SOS_ENOMEM; 358 } 373 } 359 374 360 sos_process_unref(proc_init); 375 sos_process_unref(proc_init); 361 return SOS_OK; 376 return SOS_OK; 362 } 377 } 363 378 364 379 >> 380 365 /* =========================================== 381 /* ====================================================================== 366 * The C entry point of our operating system 382 * The C entry point of our operating system 367 */ 383 */ 368 void sos_main(unsigned long magic, unsigned lo 384 void sos_main(unsigned long magic, unsigned long arg) >> 385 __attribute__((noreturn)); >> 386 void sos_main(unsigned long magic, unsigned long arg) 369 { 387 { 370 unsigned i; << 371 sos_paddr_t sos_kernel_core_base_paddr, sos_ 388 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 372 struct sos_time tick_resolution; 389 struct sos_time tick_resolution; 373 struct sos_fs_manager_instance * rootfs; 390 struct sos_fs_manager_instance * rootfs; 374 391 375 /* Size of RAM above 1MB. Might be undefined 392 /* Size of RAM above 1MB. Might be undefined ! */ 376 unsigned long int upper_mem = 0; 393 unsigned long int upper_mem = 0; 377 394 378 /* Setup bochs and console, and clear the co 395 /* Setup bochs and console, and clear the console */ 379 sos_bochs_setup(); !! 396 sos_bochs_subsystem_setup(); 380 397 381 sos_x86_videomem_setup(); 398 sos_x86_videomem_setup(); 382 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 399 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 383 400 384 /* Greetings from SOS */ 401 /* Greetings from SOS */ 385 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 402 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 386 { 403 { 387 /* Grub sends us a structure, called mul 404 /* Grub sends us a structure, called multiboot_info_t with a lot of 388 precious informations about the syste 405 precious informations about the system, see the multiboot 389 documentation for more information. * 406 documentation for more information. */ 390 multiboot_info_t *mbi = (multiboot_info_ 407 multiboot_info_t *mbi = (multiboot_info_t *) arg; 391 408 392 /* Multiboot says: "The value returned f 409 /* Multiboot says: "The value returned for upper memory is 393 maximally the address of the first up 410 maximally the address of the first upper memory hole minus 1 394 megabyte.". It also adds: "It is not 411 megabyte.". It also adds: "It is not guaranteed to be this 395 value." aka "YMMV" ;) */ 412 value." aka "YMMV" ;) */ 396 upper_mem = mbi->mem_upper; 413 upper_mem = mbi->mem_upper; 397 sos_x86_videomem_printf(1, 0, 414 sos_x86_videomem_printf(1, 0, 398 SOS_X86_VIDEO_FG 415 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 399 "Welcome From GR 416 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 400 "SOS article 8", !! 417 "SOS article 9.5", ',', 401 (unsigned)(upper 418 (unsigned)(upper_mem >> 10) + 1, 402 (unsigned)upper_ 419 (unsigned)upper_mem); 403 } 420 } 404 else if (magic == 0x42244224) 421 else if (magic == 0x42244224) 405 { 422 { 406 /* Loaded with SOS bootsect */ 423 /* Loaded with SOS bootsect */ 407 upper_mem = arg; 424 upper_mem = arg; 408 sos_x86_videomem_printf(1, 0, 425 sos_x86_videomem_printf(1, 0, 409 SOS_X86_VIDEO_FG 426 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 410 "Welcome to %s%c 427 "Welcome to %s%c RAM is %dMB (upper mem = 0x%x kB)", 411 "SOS article 8", !! 428 "SOS article 9.5", ',', 412 (unsigned)(upper 429 (unsigned)(upper_mem >> 10) + 1, 413 (unsigned)upper_ 430 (unsigned)upper_mem); 414 } 431 } 415 else 432 else 416 /* Not loaded with grub, not from an enhan 433 /* Not loaded with grub, not from an enhanced bootsect */ 417 sos_x86_videomem_printf(1, 0, 434 sos_x86_videomem_printf(1, 0, 418 SOS_X86_VIDEO_FG_Y 435 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 419 "Welcome to SOS ar !! 436 "Welcome to SOS article 9.5"); 420 437 421 sos_bochs_putstring("Message in a bochs: Thi !! 438 sos_bochs_putstring("Message in a bochs: This is SOS article 9.5.\n"); 422 439 423 /* Setup CPU segmentation and IRQ subsystem 440 /* Setup CPU segmentation and IRQ subsystem */ 424 sos_gdt_subsystem_setup(); 441 sos_gdt_subsystem_setup(); 425 sos_idt_subsystem_setup(); 442 sos_idt_subsystem_setup(); 426 443 427 /* Setup SOS IRQs and exceptions subsystem * 444 /* Setup SOS IRQs and exceptions subsystem */ 428 sos_exception_subsystem_setup(); 445 sos_exception_subsystem_setup(); 429 sos_irq_subsystem_setup(); 446 sos_irq_subsystem_setup(); 430 447 431 /* Configure the timer so as to raise the IR 448 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 432 sos_i8254_set_frequency(100); 449 sos_i8254_set_frequency(100); 433 450 434 /* Setup the kernel time subsystem to get pr 451 /* Setup the kernel time subsystem to get prepared to take the timer 435 ticks into account */ 452 ticks into account */ 436 tick_resolution = (struct sos_time) { .sec=0 453 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 437 sos_time_subsysem_setup(& tick_resolution); 454 sos_time_subsysem_setup(& tick_resolution); 438 455 439 /* We need to know the RAM size */ 456 /* We need to know the RAM size */ 440 if (upper_mem == 0) 457 if (upper_mem == 0) 441 { 458 { 442 sos_x86_videomem_putstring(20, 0, 459 sos_x86_videomem_putstring(20, 0, 443 SOS_X86_VIDEO 460 SOS_X86_VIDEO_FG_LTRED 444 | SOS_X86_V 461 | SOS_X86_VIDEO_BG_BLUE 445 | SOS_X86_V 462 | SOS_X86_VIDEO_FG_BLINKING, 446 "I don't know 463 "I don't know RAM size ! Load me with Grub..."); 447 /* STOP ! */ 464 /* STOP ! */ 448 for (;;) 465 for (;;) 449 continue; 466 continue; 450 } 467 } 451 468 452 /* 469 /* 453 * Some interrupt handlers 470 * Some interrupt handlers 454 */ 471 */ 455 472 456 /* Binding some HW interrupts and exceptions 473 /* Binding some HW interrupts and exceptions to software routines */ 457 sos_irq_set_routine(SOS_IRQ_TIMER, 474 sos_irq_set_routine(SOS_IRQ_TIMER, 458 clk_it); 475 clk_it); 459 476 460 /* 477 /* 461 * Setup physical memory management 478 * Setup physical memory management 462 */ 479 */ 463 480 464 SOS_ASSERT_FATAL(SOS_OK 481 SOS_ASSERT_FATAL(SOS_OK 465 == sos_physmem_subsystem_se 482 == sos_physmem_subsystem_setup((upper_mem<<10) + (1<<20), 466 483 &sos_kernel_core_base_paddr, 467 484 &sos_kernel_core_top_paddr)); 468 485 469 /* 486 /* 470 * Switch to paged-memory mode 487 * Switch to paged-memory mode 471 */ 488 */ 472 489 473 /* Disabling interrupts should seem more cor 490 /* Disabling interrupts should seem more correct, but it's not really 474 necessary at this stage */ 491 necessary at this stage */ 475 SOS_ASSERT_FATAL(SOS_OK == 492 SOS_ASSERT_FATAL(SOS_OK == 476 sos_paging_subsystem_setup( 493 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 477 494 sos_kernel_core_top_paddr)); 478 495 479 /* Bind the page fault exception */ 496 /* Bind the page fault exception */ 480 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 497 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 481 pgflt_ex); 498 pgflt_ex); 482 499 483 /* 500 /* 484 * Setup kernel virtual memory allocator 501 * Setup kernel virtual memory allocator 485 */ 502 */ 486 503 487 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 504 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 488 sos_kernel_ 505 sos_kernel_core_top_paddr, 489 bootstrap_s 506 bootstrap_stack_bottom, 490 bootstrap_s 507 bootstrap_stack_bottom 491 + bootstrap 508 + bootstrap_stack_size)) 492 sos_bochs_printf("Could not setup the Kern 509 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 493 510 494 if (sos_kmalloc_subsystem_setup()) 511 if (sos_kmalloc_subsystem_setup()) 495 sos_bochs_printf("Could not setup the Kmal 512 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 496 513 497 /* 514 /* 498 * Initialize the MMU context subsystem 515 * Initialize the MMU context subsystem 499 */ 516 */ 500 sos_mm_context_subsystem_setup(); 517 sos_mm_context_subsystem_setup(); 501 518 502 /* 519 /* 503 * Initialize the CPU context subsystem 520 * Initialize the CPU context subsystem 504 */ 521 */ 505 sos_cpu_context_subsystem_setup(); 522 sos_cpu_context_subsystem_setup(); 506 523 507 /* 524 /* 508 * Bind the syscall handler to its software 525 * Bind the syscall handler to its software interrupt handler 509 */ 526 */ 510 sos_swintr_subsystem_setup(); 527 sos_swintr_subsystem_setup(); 511 528 512 529 513 /* 530 /* 514 * Initialize the Kernel thread and schedule 531 * Initialize the Kernel thread and scheduler subsystems 515 */ 532 */ 516 533 517 /* Initialize kernel thread subsystem */ 534 /* Initialize kernel thread subsystem */ 518 sos_thread_subsystem_setup(bootstrap_stack_b 535 sos_thread_subsystem_setup(bootstrap_stack_bottom, 519 bootstrap_stack_s 536 bootstrap_stack_size); 520 537 521 /* Initialize the scheduler */ 538 /* Initialize the scheduler */ 522 sos_sched_subsystem_setup(); 539 sos_sched_subsystem_setup(); 523 540 524 /* Declare the IDLE thread */ 541 /* Declare the IDLE thread */ 525 SOS_ASSERT_FATAL(sos_create_kernel_thread("i 542 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, 526 SO 543 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 527 544 528 /* Prepare the stats subsystem */ 545 /* Prepare the stats subsystem */ 529 sos_load_subsystem_setup(); 546 sos_load_subsystem_setup(); 530 547 531 /* Declare a thread that prints some stats * 548 /* Declare a thread that prints some stats */ 532 SOS_ASSERT_FATAL(sos_create_kernel_thread("s 549 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, 533 NU 550 NULL, 534 SO 551 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 535 552 536 553 537 /* 554 /* 538 * Initialise user address space management 555 * Initialise user address space management subsystem 539 */ 556 */ 540 sos_umem_vmm_subsystem_setup(); 557 sos_umem_vmm_subsystem_setup(); 541 sos_dev_zero_subsystem_setup(); 558 sos_dev_zero_subsystem_setup(); >> 559 >> 560 /* Initialize the page and block cache subsystems */ >> 561 sos_fs_pagecache_subsystem_setup(); >> 562 sos_blockdev_subsystem_setup(); >> 563 sos_dev_mem_chardev_setup(); 542 564 543 /* 565 /* 544 * Initialize process stuff 566 * Initialize process stuff 545 */ 567 */ 546 sos_process_subsystem_setup(); 568 sos_process_subsystem_setup(); 547 569 548 570 549 /* Enabling the HW interrupts here, this wil 571 /* Enabling the HW interrupts here, this will make the timer HW 550 interrupt call the scheduler */ 572 interrupt call the scheduler */ 551 asm volatile ("sti\n"); 573 asm volatile ("sti\n"); 552 574 553 575 554 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_sub 576 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_subsystem_setup()); 555 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_ 577 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_setup(NULL, 556 578 "virtfs", 557 579 NULL, 558 580 & rootfs)); >> 581 >> 582 >> 583 tty_subsystem_setup(); >> 584 sos_ttyS0_subsystem_setup(); >> 585 sos_console_subsystem_setup(); >> 586 >> 587 >> 588 sos_ide_subsystem_setup(); >> 589 559 590 560 591 561 /* Start the 'init' process, which in turns 592 /* Start the 'init' process, which in turns launches the other 562 programs */ 593 programs */ 563 start_init(rootfs); 594 start_init(rootfs); 564 /* 595 /* 565 * We can safely exit from this function now 596 * We can safely exit from this function now, for there is already 566 * an idle Kernel thread ready to make the C 597 * an idle Kernel thread ready to make the CPU busy working... 567 * 598 * 568 * However, we must EXPLICITELY call sos_thr 599 * However, we must EXPLICITELY call sos_thread_exit() because a 569 * simple "return" will return nowhere ! Act 600 * simple "return" will return nowhere ! Actually this first thread 570 * was initialized by the Grub bootstrap sta 601 * was initialized by the Grub bootstrap stage, at a time when the 571 * word "thread" did not exist. This means t 602 * word "thread" did not exist. This means that the stack was not 572 * setup in order for a return here to call 603 * setup in order for a return here to call sos_thread_exit() 573 * automagically. Hence we must call it manu 604 * automagically. Hence we must call it manually. This is the ONLY 574 * kernel thread where we must do this manua 605 * kernel thread where we must do this manually. 575 */ 606 */ 576 sos_bochs_printf("Bye from primary thread !\ 607 sos_bochs_printf("Bye from primary thread !\n"); 577 sos_thread_exit(); 608 sos_thread_exit(); 578 SOS_FATAL_ERROR("No trespassing !"); 609 SOS_FATAL_ERROR("No trespassing !"); 579 } 610 }
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