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