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001 /* Copyright (C) 2004 The SOS Team 001 /* Copyright (C) 2004 The SOS Team 002 002 003 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 007 007 008 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 011 GNU General Public License for more details. 012 012 013 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 016 USA. 017 */ 017 */ 018 018 >> 019 #include <sos/errno.h> >> 020 019 /* Include definitions of the multiboot standa 021 /* Include definitions of the multiboot standard */ 020 #include <bootstrap/multiboot.h> 022 #include <bootstrap/multiboot.h> 021 #include <hwcore/idt.h> 023 #include <hwcore/idt.h> 022 #include <hwcore/gdt.h> 024 #include <hwcore/gdt.h> 023 #include <hwcore/irq.h> 025 #include <hwcore/irq.h> 024 #include <hwcore/exception.h> 026 #include <hwcore/exception.h> 025 #include <hwcore/i8254.h> 027 #include <hwcore/i8254.h> 026 #include <sos/list.h> 028 #include <sos/list.h> 027 #include <sos/physmem.h> 029 #include <sos/physmem.h> 028 #include <hwcore/paging.h> 030 #include <hwcore/paging.h> >> 031 #include <hwcore/mm_context.h> >> 032 #include <hwcore/swintr.h> 029 #include <sos/kmem_vmm.h> 033 #include <sos/kmem_vmm.h> 030 #include <sos/kmalloc.h> 034 #include <sos/kmalloc.h> 031 #include <sos/time.h> 035 #include <sos/time.h> 032 #include <sos/thread.h> 036 #include <sos/thread.h> >> 037 #include <sos/process.h> >> 038 #include <sos/umem_vmm.h> 033 #include <sos/klibc.h> 039 #include <sos/klibc.h> 034 #include <sos/assert.h> 040 #include <sos/assert.h> 035 #include <drivers/x86_videomem.h> 041 #include <drivers/x86_videomem.h> 036 #include <drivers/bochs.h> 042 #include <drivers/bochs.h> 037 !! 043 #include <sos/calcload.h> >> 044 #include <sos/umem_vmm.h> >> 045 #include <sos/binfmt_elf32.h> >> 046 #include <drivers/zero.h> >> 047 #include <sos/fs.h> >> 048 #include <drivers/fs_virtfs.h> >> 049 #include <drivers/devices.h> >> 050 #include <drivers/mem.h> >> 051 #include <drivers/tty.h> >> 052 #include <drivers/console.h> >> 053 #include <drivers/serial.h> >> 054 #include <sos/blkdev.h> >> 055 #include <sos/fs_pagecache.h> >> 056 #include <drivers/ide.h> 038 057 039 /* Helper function to display each bits of a 3 058 /* Helper function to display each bits of a 32bits integer on the 040 screen as dark or light carrets */ 059 screen as dark or light carrets */ 041 void display_bits(unsigned char row, unsigned 060 void display_bits(unsigned char row, unsigned char col, 042 unsigned char attribute, 061 unsigned char attribute, 043 sos_ui32_t integer) 062 sos_ui32_t integer) 044 { 063 { 045 int i; 064 int i; 046 /* Scan each bit of the integer, MSb first * 065 /* Scan each bit of the integer, MSb first */ 047 for (i = 31 ; i >= 0 ; i--) 066 for (i = 31 ; i >= 0 ; i--) 048 { 067 { 049 /* Test if bit i of 'integer' is set */ 068 /* Test if bit i of 'integer' is set */ 050 int bit_i = (integer & (1 << i)); 069 int bit_i = (integer & (1 << i)); 051 /* Ascii 219 => dark carret, Ascii 177 = 070 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 052 unsigned char ascii_code = bit_i?219:177 071 unsigned char ascii_code = bit_i?219:177; 053 sos_x86_videomem_putchar(row, col++, 072 sos_x86_videomem_putchar(row, col++, 054 attribute, 073 attribute, 055 ascii_code); 074 ascii_code); 056 } 075 } 057 } 076 } 058 077 059 << 060 /* Clock IRQ handler */ 078 /* Clock IRQ handler */ 061 static void clk_it(int intid) 079 static void clk_it(int intid) 062 { 080 { 063 static sos_ui32_t clock_count = 0; 081 static sos_ui32_t clock_count = 0; 064 082 065 display_bits(0, 48, 083 display_bits(0, 48, 066 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 084 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 067 clock_count); 085 clock_count); 068 clock_count++; 086 clock_count++; 069 087 070 /* Execute the expired timeout actions (if a 088 /* Execute the expired timeout actions (if any) */ 071 sos_time_do_tick(); 089 sos_time_do_tick(); >> 090 >> 091 /* Update scheduler statistics and status */ >> 092 sos_sched_do_timer_tick(); 072 } 093 } 073 094 074 095 075 /* =========================================== 096 /* ====================================================================== 076 * Page fault exception handling 097 * Page fault exception handling 077 */ 098 */ 078 099 079 /* Helper function to dump a backtrace on boch << 080 static void dump_backtrace(const struct sos_cp << 081 sos_vaddr_t stack_b << 082 sos_size_t stack_s << 083 sos_bool_t on_conso << 084 sos_bool_t on_bochs << 085 { << 086 static void backtracer(sos_vaddr_t PC, << 087 sos_vaddr_t params, << 088 sos_ui32_t depth, << 089 void *custom_arg) << 090 { << 091 sos_ui32_t invalid = 0xffffffff, *arg1, << 092 << 093 /* Get the address of the first 3 argume << 094 frame. Among these arguments, 0, 1, 2 << 095 meaningful (depending on how many arg << 096 take). */ << 097 arg1 = (sos_ui32_t*)params; << 098 arg2 = (sos_ui32_t*)(params+4); << 099 arg3 = (sos_ui32_t*)(params+8); << 100 arg4 = (sos_ui32_t*)(params+12); << 101 << 102 /* Make sure the addresses of these argu << 103 stack boundaries */ << 104 #define INTERVAL_OK(b,v,u) ( ((b) <= (sos_vadd << 105 && ((sos_vaddr_t) << 106 if (!INTERVAL_OK(stack_bottom, arg1, sta << 107 arg1 = &invalid; << 108 if (!INTERVAL_OK(stack_bottom, arg2, sta << 109 arg2 = &invalid; << 110 if (!INTERVAL_OK(stack_bottom, arg3, sta << 111 arg3 = &invalid; << 112 if (!INTERVAL_OK(stack_bottom, arg4, sta << 113 arg4 = &invalid; << 114 << 115 /* Print the function context for this f << 116 if (on_bochs) << 117 sos_bochs_printf("[%d] PC=0x%x arg1=0x << 118 (unsigned)depth, (uns << 119 (unsigned)*arg1, (uns << 120 (unsigned)*arg3); << 121 << 122 if (on_console) << 123 sos_x86_videomem_printf(23-depth, 3, << 124 SOS_X86_VIDEO_ << 125 | SOS_X86_VI << 126 "[%d] PC=0x%x << 127 (unsigned)dept << 128 (unsigned)*arg << 129 (unsigned)*arg << 130 << 131 } << 132 << 133 sos_backtrace(cpu_state, 15, stack_bottom, s << 134 } << 135 << 136 100 137 /* Page fault exception handler with demand pa 101 /* Page fault exception handler with demand paging for the kernel */ 138 static void pgflt_ex(int intid, const struct s !! 102 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 139 { 103 { 140 static sos_ui32_t demand_paging_count = 0; 104 static sos_ui32_t demand_paging_count = 0; 141 sos_vaddr_t faulting_vaddr = sos_cpu_context !! 105 struct sos_thread * cur_thr = sos_thread_get_current(); >> 106 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 142 sos_paddr_t ppage_paddr; 107 sos_paddr_t ppage_paddr; 143 108 >> 109 if (sos_cpu_context_is_in_user_mode(ctxt) >> 110 || (cur_thr->fixup_uaccess.return_vaddr)) >> 111 { >> 112 __label__ unforce_address_space; >> 113 sos_bool_t need_to_setup_mmu; >> 114 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); >> 115 >> 116 /* Make sure to always stay in the interrupted thread's MMU >> 117 configuration */ >> 118 need_to_setup_mmu = (cur_thr->squatted_mm_context >> 119 != sos_process_get_mm_context(cur_thr->process)); >> 120 if (need_to_setup_mmu) >> 121 sos_thread_prepare_user_space_access(NULL, 0); >> 122 >> 123 if (SOS_OK == >> 124 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, >> 125 errcode & (1 << 1), >> 126 TRUE)) >> 127 goto unforce_address_space; >> 128 >> 129 /* If the page fault occured in kernel mode, return to kernel to >> 130 the fixup address */ >> 131 if (! sos_cpu_context_is_in_user_mode(ctxt)) >> 132 { >> 133 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; >> 134 sos_cpu_context_set_EX_return_address(ctxt, >> 135 cur_thr->fixup_uaccess.return_vaddr); >> 136 goto unforce_address_space; >> 137 } >> 138 >> 139 if (need_to_setup_mmu) >> 140 sos_thread_end_user_space_access(); >> 141 >> 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(), >> 144 sos_cpu_context_get_PC(ctxt), >> 145 (unsigned)faulting_vaddr, >> 146 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 147 sos_bochs_printf("Terminating User thread\n"); >> 148 sos_thread_exit(); >> 149 >> 150 unforce_address_space: >> 151 if (need_to_setup_mmu) >> 152 sos_thread_end_user_space_access(); >> 153 return; >> 154 } >> 155 144 /* Check if address is covered by any VMM ra 156 /* Check if address is covered by any VMM range */ 145 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 157 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 146 { 158 { 147 /* No: The page fault is out of any kern 159 /* No: The page fault is out of any kernel virtual region. For 148 the moment, we don't handle this. */ 160 the moment, we don't handle this. */ 149 dump_backtrace(ctxt, << 150 bootstrap_stack_bottom, << 151 bootstrap_stack_size, << 152 TRUE, TRUE); << 153 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)!", 154 sos_cpu_context_ 162 sos_cpu_context_get_PC(ctxt), 155 (unsigned)faulti 163 (unsigned)faulting_vaddr, 156 (unsigned)sos_cp 164 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 157 SOS_ASSERT_FATAL(! "Got page fault (note 165 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 158 } 166 } 159 167 160 168 161 /* 169 /* 162 * Demand paging !! 170 * Demand paging in kernel space 163 */ 171 */ 164 172 165 /* Update the number of demand paging reques 173 /* Update the number of demand paging requests handled */ 166 demand_paging_count ++; 174 demand_paging_count ++; 167 display_bits(0, 0, 175 display_bits(0, 0, 168 SOS_X86_VIDEO_FG_LTRED | SOS_X8 176 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 169 demand_paging_count); 177 demand_paging_count); 170 178 171 /* Allocate a new page for the virtual addre 179 /* Allocate a new page for the virtual address */ 172 ppage_paddr = sos_physmem_ref_physpage_new(F 180 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 173 if (! ppage_paddr) 181 if (! ppage_paddr) 174 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 !)"); 175 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 183 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 176 SO 184 SOS_PAGE_ALIGN_INF(faulting_vaddr), 177 FA 185 FALSE, 178 SO 186 SOS_VM_MAP_PROT_READ 179 | 187 | SOS_VM_MAP_PROT_WRITE 180 | 188 | SOS_VM_MAP_ATOMIC)); 181 sos_physmem_unref_physpage(ppage_paddr); 189 sos_physmem_unref_physpage(ppage_paddr); 182 190 183 /* Ok, we can now return to interrupted cont 191 /* Ok, we can now return to interrupted context */ 184 } 192 } 185 193 186 194 >> 195 187 /* =========================================== 196 /* ====================================================================== 188 * Demonstrate the use of SOS kernel threads !! 197 * An operating system MUST always have a ready thread ! Otherwise: 189 * - Kernel Threads are created with various !! 198 * what would the CPU have to execute ?! 190 * state is printed on both the console and << 191 * - For tests regarding threads' synchroniza << 192 */ 199 */ 193 !! 200 static void idle_thread(void* unused) __attribute__((noreturn)); 194 struct thr_arg !! 201 static void idle_thread(void* unused) 195 { 202 { 196 char character; !! 203 sos_ui32_t idle_twiddle = 0; 197 int color; << 198 << 199 int col; << 200 int row; << 201 }; << 202 << 203 << 204 static void demo_thread(void *arg) << 205 { << 206 struct thr_arg *thr_arg = (struct thr_arg*)a << 207 int progress = 0; << 208 204 209 sos_bochs_printf("start %c", thr_arg->charac << 210 while (1) 205 while (1) 211 { 206 { 212 progress ++; !! 207 /* Remove this instruction if you get an "Invalid opcode" CPU 213 display_bits(thr_arg->row, thr_arg->col+ !! 208 exception (old 80386 CPU) */ 214 !! 209 asm("hlt\n"); 215 sos_bochs_putchar(thr_arg->character); << 216 << 217 /* Yield the CPU to another thread somet << 218 if ((random() % 100) == 0) << 219 { << 220 sos_bochs_printf("[37myield(%c)[m\ << 221 sos_x86_videomem_putchar(thr_arg->ro << 222 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 223 sos_x86_videomem_putchar(thr_arg->ro << 224 } << 225 << 226 /* Go to sleep some other times... */ << 227 else if ((random() % 200) == 0) << 228 { << 229 struct sos_time t = (struct sos_time << 230 sos_bochs_printf("[37msleep1(%c)[m << 231 sos_x86_videomem_putchar(thr_arg->ro << 232 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 233 SOS_ASSERT_FATAL(sos_time_is_zero(& << 234 sos_x86_videomem_putchar(thr_arg->ro << 235 } << 236 << 237 /* Go to sleep for a longer time some ot << 238 else if ((random() % 300) == 0) << 239 { << 240 struct sos_time t = (struct sos_time << 241 sos_bochs_printf("[37msleep2(%c)[m << 242 sos_x86_videomem_putchar(thr_arg->ro << 243 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 244 SOS_ASSERT_FATAL(sos_time_is_zero(& << 245 sos_x86_videomem_putchar(thr_arg->ro << 246 } << 247 210 248 /* Infinite loop otherwise */ !! 211 idle_twiddle ++; >> 212 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, >> 213 idle_twiddle); >> 214 >> 215 /* Lend the CPU to some other thread */ >> 216 sos_thread_yield(); 249 } 217 } 250 } 218 } 251 219 252 220 253 static void test_thread() !! 221 /* ====================================================================== >> 222 * Kernel thread showing some CPU usage statistics on the console every 1s >> 223 */ >> 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) 254 { 228 { 255 /* "static" variables because we want them t !! 229 while (1) 256 function returns */ !! 230 { 257 static struct thr_arg arg_b, arg_c, arg_d, a !! 231 sos_ui32_t flags; 258 sos_ui32_t flags; !! 232 sos_ui32_t load1, load5, load15; 259 !! 233 char str1[11], str5[11], str15[11]; 260 sos_disable_IRQs(flags); !! 234 struct sos_time t; >> 235 t.sec = 1; >> 236 t.nanosec = 0; >> 237 >> 238 sos_thread_sleep(& t); >> 239 >> 240 sos_disable_IRQs(flags); >> 241 >> 242 /* The IDLE task is EXcluded in the following computation */ >> 243 sos_load_get_sload(&load1, &load5, &load15); >> 244 sos_load_to_string(str1, load1); >> 245 sos_load_to_string(str5, load5); >> 246 sos_load_to_string(str15, load15); >> 247 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+0, LOAD_DISPLAY_STARTROW, >> 248 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 249 "Kernel (- Idle): %s %s %s ", >> 250 str1, str5, str15); >> 251 >> 252 sos_load_get_uload(&load1, &load5, &load15); >> 253 sos_load_to_string(str1, load1); >> 254 sos_load_to_string(str5, load5); >> 255 sos_load_to_string(str15, load15); >> 256 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+1, LOAD_DISPLAY_STARTROW, >> 257 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 258 "User: %s %s %s ", >> 259 str1, str5, str15); >> 260 >> 261 sos_load_get_uratio(&load1, &load5, &load15); >> 262 sos_load_to_string(str1, load1); >> 263 sos_load_to_string(str5, load5); >> 264 sos_load_to_string(str15, load15); >> 265 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+2, LOAD_DISPLAY_STARTROW, >> 266 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 267 "User CPU %%: %s %s %s ", >> 268 str1, str5, str15); >> 269 >> 270 /* The IDLE task is INcluded in the following computation */ >> 271 sos_load_get_sratio(&load1, &load5, &load15); >> 272 sos_load_to_string(str1, load1); >> 273 sos_load_to_string(str5, load5); >> 274 sos_load_to_string(str15, load15); >> 275 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+3, LOAD_DISPLAY_STARTROW, >> 276 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 277 "Kernel CPU %% (+ Idle): %s %s %s ", >> 278 str1, str5, str15); >> 279 sos_restore_IRQs(flags); >> 280 } >> 281 } 261 282 262 arg_b = (struct thr_arg) { .character='b', . << 263 sos_create_kernel_thread("YO[b]", demo_threa << 264 283 265 arg_c = (struct thr_arg) { .character='c', . !! 284 /* ====================================================================== 266 sos_create_kernel_thread("YO[c]", demo_threa !! 285 * Start the "init" (userland) process >> 286 */ >> 287 static sos_ret_t >> 288 start_init(struct sos_fs_manager_instance * rootfs) >> 289 { >> 290 sos_ret_t retval; >> 291 struct sos_umem_vmm_as *as_init; >> 292 struct sos_process *proc_init; >> 293 struct sos_thread *new_thr; >> 294 sos_uaddr_t ustack, start_uaddr; >> 295 struct sos_fs_opened_file * init_root, * init_cwd, * unused_of; >> 296 >> 297 /* Create the new process */ >> 298 proc_init = sos_process_create("init", FALSE); >> 299 if (! proc_init) >> 300 return -SOS_ENOMEM; >> 301 as_init = sos_process_get_address_space(proc_init); 267 302 268 arg_d = (struct thr_arg) { .character='d', . << 269 sos_create_kernel_thread("YO[d]", demo_threa << 270 303 271 arg_e = (struct thr_arg) { .character='e', . !! 304 /* 272 sos_create_kernel_thread("YO[e]", demo_threa !! 305 * Setup the root and CWD directories of the process. The root of >> 306 * this process will correspond to the "global" root of the whole >> 307 * system since all the future processes will duplicate it ! >> 308 */ >> 309 retval = sos_fs_new_opened_file(proc_init, rootfs->root, >> 310 SOS_FS_OPEN_READ | SOS_FS_OPEN_WRITE, >> 311 & init_root); >> 312 if (SOS_OK != retval) >> 313 { >> 314 sos_process_unref(proc_init); >> 315 return -SOS_ENOENT; >> 316 } 273 317 274 arg_R = (struct thr_arg) { .character='R', . !! 318 /* Duplicate the root file to set the current working directory of 275 sos_create_kernel_thread("YO[R]", demo_threa !! 319 the init process */ >> 320 retval = sos_fs_duplicate_opened_file(init_root, proc_init, >> 321 & init_cwd); >> 322 if (SOS_OK != retval) >> 323 { >> 324 sos_fs_close(init_root); >> 325 sos_process_unref(proc_init); >> 326 return -SOS_ENOENT; >> 327 } 276 328 277 arg_S = (struct thr_arg) { .character='S', . !! 329 /* Now update the process ! */ 278 sos_create_kernel_thread("YO[S]", demo_threa !! 330 if ( ( SOS_OK != sos_process_chroot(proc_init, init_root, & unused_of) ) >> 331 || ( SOS_OK != sos_process_chdir(proc_init, init_cwd, & unused_of) ) ) >> 332 { >> 333 sos_fs_close(init_root); >> 334 sos_fs_close(init_cwd); >> 335 sos_process_chroot(proc_init, NULL, & unused_of); >> 336 sos_process_chdir(proc_init, NULL, & unused_of); >> 337 sos_process_unref(proc_init); >> 338 return -SOS_ENOENT; >> 339 } 279 340 280 sos_restore_IRQs(flags); << 281 } << 282 341 283 342 284 /* =========================================== !! 343 /* Map the 'init' program in user space */ 285 * An operating system MUST always have a read !! 344 start_uaddr = sos_binfmt_elf32_map(as_init, "init"); 286 * what would the CPU have to execute ?! !! 345 if (0 == start_uaddr) 287 */ !! 346 { 288 static void idle_thread() !! 347 sos_process_unref(proc_init); 289 { !! 348 return -SOS_ENOENT; 290 sos_ui32_t idle_twiddle = 0; !! 349 } 291 350 292 while (1) !! 351 /* Allocate the user stack */ >> 352 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; >> 353 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, >> 354 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, >> 355 /* PRIVATE */ 0); >> 356 if (SOS_OK != retval) 293 { 357 { 294 /* Remove this instruction if you get an !! 358 sos_process_unref(proc_init); 295 exception (old 80386 CPU) */ !! 359 return -SOS_ENOMEM; 296 asm("hlt\n"); !! 360 } 297 361 298 idle_twiddle ++; !! 362 /* Now create the user thread */ 299 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE !! 363 new_thr = sos_create_user_thread(NULL, 300 idle_twiddle); !! 364 proc_init, 301 !! 365 start_uaddr, 302 /* Lend the CPU to some other thread */ !! 366 0, 0, 303 sos_thread_yield(); !! 367 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, >> 368 SOS_SCHED_PRIO_TS_LOWEST); >> 369 if (! new_thr) >> 370 { >> 371 sos_process_unref(proc_init); >> 372 return -SOS_ENOMEM; 304 } 373 } >> 374 >> 375 sos_process_unref(proc_init); >> 376 return SOS_OK; 305 } 377 } 306 378 307 379 >> 380 308 /* =========================================== 381 /* ====================================================================== 309 * The C entry point of our operating system 382 * The C entry point of our operating system 310 */ 383 */ 311 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) 312 { 387 { 313 unsigned i; << 314 sos_paddr_t sos_kernel_core_base_paddr, sos_ 388 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 315 struct sos_time tick_resolution; 389 struct sos_time tick_resolution; >> 390 struct sos_fs_manager_instance * rootfs; 316 391 317 /* Grub sends us a structure, called multibo !! 392 /* Size of RAM above 1MB. Might be undefined ! */ 318 precious informations about the system, s !! 393 unsigned long int upper_mem = 0; 319 documentation for more information. */ << 320 multiboot_info_t *mbi; << 321 mbi = (multiboot_info_t *) addr; << 322 394 323 /* Setup bochs and console, and clear the co 395 /* Setup bochs and console, and clear the console */ 324 sos_bochs_setup(); !! 396 sos_bochs_subsystem_setup(); 325 397 326 sos_x86_videomem_setup(); 398 sos_x86_videomem_setup(); 327 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 399 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 328 400 329 /* Greetings from SOS */ 401 /* Greetings from SOS */ 330 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 402 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 331 /* Loaded with Grub */ !! 403 { 332 sos_x86_videomem_printf(1, 0, !! 404 /* Grub sends us a structure, called multiboot_info_t with a lot of 333 SOS_X86_VIDEO_FG_Y !! 405 precious informations about the system, see the multiboot 334 "Welcome From GRUB !! 406 documentation for more information. */ 335 "SOS article 6.5", !! 407 multiboot_info_t *mbi = (multiboot_info_t *) arg; 336 (unsigned)(mbi->me !! 408 337 (unsigned)mbi->mem !! 409 /* Multiboot says: "The value returned for upper memory is >> 410 maximally the address of the first upper memory hole minus 1 >> 411 megabyte.". It also adds: "It is not guaranteed to be this >> 412 value." aka "YMMV" ;) */ >> 413 upper_mem = mbi->mem_upper; >> 414 sos_x86_videomem_printf(1, 0, >> 415 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 416 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 417 "SOS article 9.5", ',', >> 418 (unsigned)(upper_mem >> 10) + 1, >> 419 (unsigned)upper_mem); >> 420 } >> 421 else if (magic == 0x42244224) >> 422 { >> 423 /* Loaded with SOS bootsect */ >> 424 upper_mem = arg; >> 425 sos_x86_videomem_printf(1, 0, >> 426 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 427 "Welcome to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 428 "SOS article 9.5", ',', >> 429 (unsigned)(upper_mem >> 10) + 1, >> 430 (unsigned)upper_mem); >> 431 } 338 else 432 else 339 /* Not loaded with grub */ !! 433 /* Not loaded with grub, not from an enhanced bootsect */ 340 sos_x86_videomem_printf(1, 0, 434 sos_x86_videomem_printf(1, 0, 341 SOS_X86_VIDEO_FG_Y 435 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 342 "Welcome to SOS ar !! 436 "Welcome to SOS article 9.5"); 343 437 344 sos_bochs_putstring("Message in a bochs: Thi !! 438 sos_bochs_putstring("Message in a bochs: This is SOS article 9.5.\n"); 345 439 346 /* Setup CPU segmentation and IRQ subsystem 440 /* Setup CPU segmentation and IRQ subsystem */ 347 sos_gdt_subsystem_setup(); 441 sos_gdt_subsystem_setup(); 348 sos_idt_subsystem_setup(); 442 sos_idt_subsystem_setup(); 349 443 350 /* Setup SOS IRQs and exceptions subsystem * 444 /* Setup SOS IRQs and exceptions subsystem */ 351 sos_exception_subsystem_setup(); 445 sos_exception_subsystem_setup(); 352 sos_irq_subsystem_setup(); 446 sos_irq_subsystem_setup(); 353 447 354 /* Configure the timer so as to raise the IR 448 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 355 sos_i8254_set_frequency(100); 449 sos_i8254_set_frequency(100); 356 450 357 /* Setup the kernel time subsystem to get pr 451 /* Setup the kernel time subsystem to get prepared to take the timer 358 ticks into account */ 452 ticks into account */ 359 tick_resolution = (struct sos_time) { .sec=0 453 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 360 sos_time_subsysem_setup(& tick_resolution); 454 sos_time_subsysem_setup(& tick_resolution); 361 455 362 /* We need a multiboot-compliant boot loader !! 456 /* We need to know the RAM size */ 363 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) !! 457 if (upper_mem == 0) 364 { 458 { 365 sos_x86_videomem_putstring(20, 0, 459 sos_x86_videomem_putstring(20, 0, 366 SOS_X86_VIDEO 460 SOS_X86_VIDEO_FG_LTRED 367 | SOS_X86_V 461 | SOS_X86_VIDEO_BG_BLUE 368 | SOS_X86_V 462 | SOS_X86_VIDEO_FG_BLINKING, 369 "I'm not load !! 463 "I don't know RAM size ! Load me with Grub..."); 370 /* STOP ! */ 464 /* STOP ! */ 371 for (;;) 465 for (;;) 372 continue; 466 continue; 373 } 467 } 374 468 375 /* 469 /* 376 * Some interrupt handlers 470 * Some interrupt handlers 377 */ 471 */ 378 472 379 /* Binding some HW interrupts and exceptions 473 /* Binding some HW interrupts and exceptions to software routines */ 380 sos_irq_set_routine(SOS_IRQ_TIMER, 474 sos_irq_set_routine(SOS_IRQ_TIMER, 381 clk_it); 475 clk_it); 382 476 383 /* 477 /* 384 * Setup physical memory management 478 * Setup physical memory management 385 */ 479 */ 386 480 387 /* Multiboot says: "The value returned for u !! 481 SOS_ASSERT_FATAL(SOS_OK 388 the address of the first upper memory hol !! 482 == sos_physmem_subsystem_setup((upper_mem<<10) + (1<<20), 389 also adds: "It is not guaranteed to be th !! 483 &sos_kernel_core_base_paddr, 390 sos_physmem_subsystem_setup((mbi->mem_upper< !! 484 &sos_kernel_core_top_paddr)); 391 & sos_kernel_cor << 392 & sos_kernel_cor << 393 485 394 /* 486 /* 395 * Switch to paged-memory mode 487 * Switch to paged-memory mode 396 */ 488 */ 397 489 398 /* Disabling interrupts should seem more cor 490 /* Disabling interrupts should seem more correct, but it's not really 399 necessary at this stage */ 491 necessary at this stage */ 400 SOS_ASSERT_FATAL(SOS_OK == 492 SOS_ASSERT_FATAL(SOS_OK == 401 sos_paging_subsystem_setup( 493 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 402 494 sos_kernel_core_top_paddr)); 403 495 404 /* Bind the page fault exception */ 496 /* Bind the page fault exception */ 405 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 497 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 406 pgflt_ex); 498 pgflt_ex); 407 499 408 /* 500 /* 409 * Setup kernel virtual memory allocator 501 * Setup kernel virtual memory allocator 410 */ 502 */ 411 503 412 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 504 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 413 sos_kernel_ 505 sos_kernel_core_top_paddr, 414 bootstrap_s 506 bootstrap_stack_bottom, 415 bootstrap_s 507 bootstrap_stack_bottom 416 + bootstrap 508 + bootstrap_stack_size)) 417 sos_bochs_printf("Could not setup the Kern 509 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 418 510 419 if (sos_kmalloc_subsystem_setup()) 511 if (sos_kmalloc_subsystem_setup()) 420 sos_bochs_printf("Could not setup the Kmal 512 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 421 513 422 /* 514 /* >> 515 * Initialize the MMU context subsystem >> 516 */ >> 517 sos_mm_context_subsystem_setup(); >> 518 >> 519 /* >> 520 * Initialize the CPU context subsystem >> 521 */ >> 522 sos_cpu_context_subsystem_setup(); >> 523 >> 524 /* >> 525 * Bind the syscall handler to its software interrupt handler >> 526 */ >> 527 sos_swintr_subsystem_setup(); >> 528 >> 529 >> 530 /* 423 * Initialize the Kernel thread and schedule 531 * Initialize the Kernel thread and scheduler subsystems 424 */ 532 */ 425 533 426 /* Initialize kernel thread subsystem */ 534 /* Initialize kernel thread subsystem */ 427 sos_thread_subsystem_setup(bootstrap_stack_b 535 sos_thread_subsystem_setup(bootstrap_stack_bottom, 428 bootstrap_stack_s 536 bootstrap_stack_size); 429 537 430 /* Initialize the scheduler */ 538 /* Initialize the scheduler */ 431 sos_sched_subsystem_setup(); 539 sos_sched_subsystem_setup(); 432 540 433 /* Declare the IDLE thread */ 541 /* Declare the IDLE thread */ 434 SOS_ASSERT_FATAL(sos_create_kernel_thread("i !! 542 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, >> 543 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 544 >> 545 /* Prepare the stats subsystem */ >> 546 sos_load_subsystem_setup(); >> 547 >> 548 /* Declare a thread that prints some stats */ >> 549 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, >> 550 NULL, >> 551 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 552 >> 553 >> 554 /* >> 555 * Initialise user address space management subsystem >> 556 */ >> 557 sos_umem_vmm_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(); >> 564 >> 565 /* >> 566 * Initialize process stuff >> 567 */ >> 568 sos_process_subsystem_setup(); >> 569 435 570 436 /* Enabling the HW interrupts here, this wil 571 /* Enabling the HW interrupts here, this will make the timer HW 437 interrupt call the scheduler */ 572 interrupt call the scheduler */ 438 asm volatile ("sti\n"); 573 asm volatile ("sti\n"); 439 574 440 575 441 /* Now run some Kernel threads just for fun !! 576 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_subsystem_setup()); 442 extern void MouseSim(); !! 577 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_setup(NULL, 443 MouseSim(); !! 578 "virtfs", 444 test_thread(); !! 579 NULL, >> 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 >> 590 445 591 >> 592 /* Start the 'init' process, which in turns launches the other >> 593 programs */ >> 594 start_init(rootfs); 446 /* 595 /* 447 * We can safely exit from this function now 596 * We can safely exit from this function now, for there is already 448 * an idle Kernel thread ready to make the C 597 * an idle Kernel thread ready to make the CPU busy working... 449 * 598 * 450 * However, we must EXPLICITELY call sos_thr 599 * However, we must EXPLICITELY call sos_thread_exit() because a 451 * simple "return" will return nowhere ! Act 600 * simple "return" will return nowhere ! Actually this first thread 452 * was initialized by the Grub bootstrap sta 601 * was initialized by the Grub bootstrap stage, at a time when the 453 * word "thread" did not exist. This means t 602 * word "thread" did not exist. This means that the stack was not 454 * setup in order for a return here to call 603 * setup in order for a return here to call sos_thread_exit() 455 * automagically. Hence we must call it manu 604 * automagically. Hence we must call it manually. This is the ONLY 456 * kernel thread where we must do this manua 605 * kernel thread where we must do this manually. 457 */ 606 */ 458 sos_bochs_printf("Bye from primary thread !\ 607 sos_bochs_printf("Bye from primary thread !\n"); 459 sos_thread_exit(); 608 sos_thread_exit(); 460 SOS_FATAL_ERROR("No trespassing !"); 609 SOS_FATAL_ERROR("No trespassing !"); 461 } 610 }
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