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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 definitions of the multiboot standa 019 /* Include definitions of the multiboot standard */ 020 #include <bootstrap/multiboot.h> 020 #include <bootstrap/multiboot.h> 021 #include <hwcore/idt.h> 021 #include <hwcore/idt.h> 022 #include <hwcore/gdt.h> 022 #include <hwcore/gdt.h> 023 #include <hwcore/irq.h> 023 #include <hwcore/irq.h> 024 #include <hwcore/exception.h> 024 #include <hwcore/exception.h> 025 #include <hwcore/i8254.h> 025 #include <hwcore/i8254.h> 026 #include <sos/list.h> 026 #include <sos/list.h> 027 #include <sos/physmem.h> 027 #include <sos/physmem.h> 028 #include <hwcore/paging.h> 028 #include <hwcore/paging.h> >> 029 #include <hwcore/mm_context.h> >> 030 #include <hwcore/swintr.h> 029 #include <sos/kmem_vmm.h> 031 #include <sos/kmem_vmm.h> 030 #include <sos/kmalloc.h> 032 #include <sos/kmalloc.h> 031 #include <sos/time.h> 033 #include <sos/time.h> 032 #include <sos/thread.h> 034 #include <sos/thread.h> >> 035 #include <sos/process.h> >> 036 #include <sos/umem_vmm.h> 033 #include <sos/klibc.h> 037 #include <sos/klibc.h> 034 #include <sos/assert.h> 038 #include <sos/assert.h> 035 #include <drivers/x86_videomem.h> 039 #include <drivers/x86_videomem.h> 036 #include <drivers/bochs.h> 040 #include <drivers/bochs.h> >> 041 #include <sos/calcload.h> >> 042 #include <sos/umem_vmm.h> >> 043 #include <sos/binfmt_elf32.h> >> 044 #include <drivers/zero.h> 037 045 038 046 039 /* Helper function to display each bits of a 3 047 /* Helper function to display each bits of a 32bits integer on the 040 screen as dark or light carrets */ 048 screen as dark or light carrets */ 041 void display_bits(unsigned char row, unsigned 049 void display_bits(unsigned char row, unsigned char col, 042 unsigned char attribute, 050 unsigned char attribute, 043 sos_ui32_t integer) 051 sos_ui32_t integer) 044 { 052 { 045 int i; 053 int i; 046 /* Scan each bit of the integer, MSb first * 054 /* Scan each bit of the integer, MSb first */ 047 for (i = 31 ; i >= 0 ; i--) 055 for (i = 31 ; i >= 0 ; i--) 048 { 056 { 049 /* Test if bit i of 'integer' is set */ 057 /* Test if bit i of 'integer' is set */ 050 int bit_i = (integer & (1 << i)); 058 int bit_i = (integer & (1 << i)); 051 /* Ascii 219 => dark carret, Ascii 177 = 059 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 052 unsigned char ascii_code = bit_i?219:177 060 unsigned char ascii_code = bit_i?219:177; 053 sos_x86_videomem_putchar(row, col++, 061 sos_x86_videomem_putchar(row, col++, 054 attribute, 062 attribute, 055 ascii_code); 063 ascii_code); 056 } 064 } 057 } 065 } 058 066 059 067 060 /* Clock IRQ handler */ 068 /* Clock IRQ handler */ 061 static void clk_it(int intid) 069 static void clk_it(int intid) 062 { 070 { 063 static sos_ui32_t clock_count = 0; 071 static sos_ui32_t clock_count = 0; 064 072 065 display_bits(0, 48, 073 display_bits(0, 48, 066 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 074 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 067 clock_count); 075 clock_count); 068 clock_count++; 076 clock_count++; 069 077 070 /* Execute the expired timeout actions (if a 078 /* Execute the expired timeout actions (if any) */ 071 sos_time_do_tick(); 079 sos_time_do_tick(); >> 080 >> 081 /* Update scheduler statistics and status */ >> 082 sos_sched_do_timer_tick(); 072 } 083 } 073 084 074 085 075 /* =========================================== 086 /* ====================================================================== 076 * Page fault exception handling 087 * Page fault exception handling 077 */ 088 */ 078 089 079 /* 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 << 136 090 137 /* Page fault exception handler with demand pa 091 /* Page fault exception handler with demand paging for the kernel */ 138 static void pgflt_ex(int intid, const struct s !! 092 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 139 { 093 { 140 static sos_ui32_t demand_paging_count = 0; 094 static sos_ui32_t demand_paging_count = 0; 141 sos_vaddr_t faulting_vaddr = sos_cpu_context !! 095 struct sos_thread * cur_thr = sos_thread_get_current(); >> 096 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 142 sos_paddr_t ppage_paddr; 097 sos_paddr_t ppage_paddr; 143 098 >> 099 if (sos_cpu_context_is_in_user_mode(ctxt) >> 100 || (cur_thr->fixup_uaccess.return_vaddr)) >> 101 { >> 102 __label__ unforce_address_space; >> 103 sos_bool_t need_to_setup_mmu; >> 104 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); >> 105 >> 106 /* Make sure to always stay in the interrupted thread's MMU >> 107 configuration */ >> 108 need_to_setup_mmu = (cur_thr->squatted_mm_context >> 109 != sos_process_get_mm_context(cur_thr->process)); >> 110 if (need_to_setup_mmu) >> 111 sos_thread_prepare_user_space_access(NULL, 0); >> 112 >> 113 if (SOS_OK == >> 114 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, >> 115 errcode & (1 << 1), >> 116 TRUE)) >> 117 goto unforce_address_space; >> 118 >> 119 /* If the page fault occured in kernel mode, return to kernel to >> 120 the fixup address */ >> 121 if (! sos_cpu_context_is_in_user_mode(ctxt)) >> 122 { >> 123 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; >> 124 sos_cpu_context_set_EX_return_address(ctxt, >> 125 cur_thr->fixup_uaccess.return_vaddr); >> 126 goto unforce_address_space; >> 127 } >> 128 >> 129 if (need_to_setup_mmu) >> 130 sos_thread_end_user_space_access(); >> 131 >> 132 sos_bochs_printf("Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\n", >> 133 sos_cpu_context_get_PC(ctxt), >> 134 (unsigned)faulting_vaddr, >> 135 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 136 sos_bochs_printf("Terminating User thread\n"); >> 137 sos_thread_exit(); >> 138 >> 139 unforce_address_space: >> 140 if (need_to_setup_mmu) >> 141 sos_thread_end_user_space_access(); >> 142 return; >> 143 } >> 144 144 /* Check if address is covered by any VMM ra 145 /* Check if address is covered by any VMM range */ 145 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 146 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 146 { 147 { 147 /* No: The page fault is out of any kern 148 /* No: The page fault is out of any kernel virtual region. For 148 the moment, we don't handle this. */ 149 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 150 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", 154 sos_cpu_context_ 151 sos_cpu_context_get_PC(ctxt), 155 (unsigned)faulti 152 (unsigned)faulting_vaddr, 156 (unsigned)sos_cp 153 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 157 SOS_ASSERT_FATAL(! "Got page fault (note 154 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 158 } 155 } 159 156 160 157 161 /* 158 /* 162 * Demand paging !! 159 * Demand paging in kernel space 163 */ 160 */ 164 161 165 /* Update the number of demand paging reques 162 /* Update the number of demand paging requests handled */ 166 demand_paging_count ++; 163 demand_paging_count ++; 167 display_bits(0, 0, 164 display_bits(0, 0, 168 SOS_X86_VIDEO_FG_LTRED | SOS_X8 165 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 169 demand_paging_count); 166 demand_paging_count); 170 167 171 /* Allocate a new page for the virtual addre 168 /* Allocate a new page for the virtual address */ 172 ppage_paddr = sos_physmem_ref_physpage_new(F 169 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 173 if (! ppage_paddr) 170 if (! ppage_paddr) 174 SOS_ASSERT_FATAL(! "TODO: implement swap. 171 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 172 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 176 SO 173 SOS_PAGE_ALIGN_INF(faulting_vaddr), 177 FA 174 FALSE, 178 SO 175 SOS_VM_MAP_PROT_READ 179 | 176 | SOS_VM_MAP_PROT_WRITE 180 | 177 | SOS_VM_MAP_ATOMIC)); 181 sos_physmem_unref_physpage(ppage_paddr); 178 sos_physmem_unref_physpage(ppage_paddr); 182 179 183 /* Ok, we can now return to interrupted cont 180 /* Ok, we can now return to interrupted context */ 184 } 181 } 185 182 186 183 187 /* =========================================== << 188 * Demonstrate the use of SOS kernel threads << 189 * - Kernel Threads are created with various << 190 * state is printed on both the console and << 191 * - For tests regarding threads' synchroniza << 192 */ << 193 << 194 struct thr_arg << 195 { << 196 char character; << 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 << 209 sos_bochs_printf("start %c", thr_arg->charac << 210 while (1) << 211 { << 212 progress ++; << 213 display_bits(thr_arg->row, thr_arg->col+ << 214 << 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 << 248 /* Infinite loop otherwise */ << 249 } << 250 } << 251 << 252 << 253 static void test_thread() << 254 { << 255 /* "static" variables because we want them t << 256 function returns */ << 257 static struct thr_arg arg_b, arg_c, arg_d, a << 258 sos_ui32_t flags; << 259 << 260 sos_disable_IRQs(flags); << 261 << 262 arg_b = (struct thr_arg) { .character='b', . << 263 sos_create_kernel_thread("YO[b]", demo_threa << 264 << 265 arg_c = (struct thr_arg) { .character='c', . << 266 sos_create_kernel_thread("YO[c]", demo_threa << 267 << 268 arg_d = (struct thr_arg) { .character='d', . << 269 sos_create_kernel_thread("YO[d]", demo_threa << 270 << 271 arg_e = (struct thr_arg) { .character='e', . << 272 sos_create_kernel_thread("YO[e]", demo_threa << 273 << 274 arg_R = (struct thr_arg) { .character='R', . << 275 sos_create_kernel_thread("YO[R]", demo_threa << 276 << 277 arg_S = (struct thr_arg) { .character='S', . << 278 sos_create_kernel_thread("YO[S]", demo_threa << 279 << 280 sos_restore_IRQs(flags); << 281 } << 282 << 283 184 284 /* =========================================== 185 /* ====================================================================== 285 * An operating system MUST always have a read 186 * An operating system MUST always have a ready thread ! Otherwise: 286 * what would the CPU have to execute ?! 187 * what would the CPU have to execute ?! 287 */ 188 */ 288 static void idle_thread() 189 static void idle_thread() 289 { 190 { 290 sos_ui32_t idle_twiddle = 0; 191 sos_ui32_t idle_twiddle = 0; 291 192 292 while (1) 193 while (1) 293 { 194 { 294 /* Remove this instruction if you get an 195 /* Remove this instruction if you get an "Invalid opcode" CPU 295 exception (old 80386 CPU) */ 196 exception (old 80386 CPU) */ 296 asm("hlt\n"); 197 asm("hlt\n"); 297 198 298 idle_twiddle ++; 199 idle_twiddle ++; 299 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE 200 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 300 idle_twiddle); 201 idle_twiddle); 301 202 302 /* Lend the CPU to some other thread */ 203 /* Lend the CPU to some other thread */ 303 sos_thread_yield(); 204 sos_thread_yield(); 304 } 205 } 305 } 206 } 306 207 307 208 308 /* =========================================== 209 /* ====================================================================== >> 210 * Kernel thread showing some CPU usage statistics on the console every 1s >> 211 */ >> 212 static void stat_thread() >> 213 { >> 214 while (1) >> 215 { >> 216 sos_ui32_t flags; >> 217 sos_ui32_t load1, load5, load15; >> 218 char str1[11], str5[11], str15[11]; >> 219 struct sos_time t; >> 220 t.sec = 1; >> 221 t.nanosec = 0; >> 222 >> 223 sos_thread_sleep(& t); >> 224 >> 225 sos_disable_IRQs(flags); >> 226 >> 227 /* The IDLE task is EXcluded in the following computation */ >> 228 sos_load_get_sload(&load1, &load5, &load15); >> 229 sos_load_to_string(str1, load1); >> 230 sos_load_to_string(str5, load5); >> 231 sos_load_to_string(str15, load15); >> 232 sos_x86_videomem_printf(16, 34, >> 233 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 234 "Kernel (- Idle): %s %s %s ", >> 235 str1, str5, str15); >> 236 >> 237 sos_load_get_uload(&load1, &load5, &load15); >> 238 sos_load_to_string(str1, load1); >> 239 sos_load_to_string(str5, load5); >> 240 sos_load_to_string(str15, load15); >> 241 sos_x86_videomem_printf(17, 34, >> 242 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 243 "User: %s %s %s ", >> 244 str1, str5, str15); >> 245 >> 246 sos_load_get_uratio(&load1, &load5, &load15); >> 247 sos_load_to_string(str1, load1); >> 248 sos_load_to_string(str5, load5); >> 249 sos_load_to_string(str15, load15); >> 250 sos_x86_videomem_printf(18, 34, >> 251 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 252 "User CPU %%: %s %s %s ", >> 253 str1, str5, str15); >> 254 >> 255 /* The IDLE task is INcluded in the following computation */ >> 256 sos_load_get_sratio(&load1, &load5, &load15); >> 257 sos_load_to_string(str1, load1); >> 258 sos_load_to_string(str5, load5); >> 259 sos_load_to_string(str15, load15); >> 260 sos_x86_videomem_printf(19, 34, >> 261 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 262 "Kernel CPU %% (+ Idle): %s %s %s ", >> 263 str1, str5, str15); >> 264 sos_restore_IRQs(flags); >> 265 } >> 266 } >> 267 >> 268 >> 269 /* ====================================================================== >> 270 * Start the "init" (userland) process >> 271 */ >> 272 static sos_ret_t start_init() >> 273 { >> 274 sos_ret_t retval; >> 275 struct sos_umem_vmm_as *as_init; >> 276 struct sos_process *proc_init; >> 277 struct sos_thread *new_thr; >> 278 sos_uaddr_t ustack, start_uaddr; >> 279 >> 280 /* Create the new process */ >> 281 proc_init = sos_process_create("init", FALSE); >> 282 if (! proc_init) >> 283 return -SOS_ENOMEM; >> 284 as_init = sos_process_get_address_space(proc_init); >> 285 >> 286 /* Map the 'init' program in user space */ >> 287 start_uaddr = sos_binfmt_elf32_map(as_init, "init"); >> 288 if (0 == start_uaddr) >> 289 { >> 290 sos_process_unref(proc_init); >> 291 return -SOS_ENOENT; >> 292 } >> 293 >> 294 /* Allocate the user stack */ >> 295 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; >> 296 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, >> 297 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, >> 298 /* PRIVATE */ 0); >> 299 if (SOS_OK != retval) >> 300 { >> 301 sos_bochs_printf("ici 2\n"); >> 302 sos_process_unref(proc_init); >> 303 return -SOS_ENOMEM; >> 304 } >> 305 >> 306 /* Now create the user thread */ >> 307 new_thr = sos_create_user_thread(NULL, >> 308 proc_init, >> 309 start_uaddr, >> 310 0, 0, >> 311 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, >> 312 SOS_SCHED_PRIO_TS_LOWEST); >> 313 if (! new_thr) >> 314 { >> 315 sos_bochs_printf("ici 3\n"); >> 316 sos_process_unref(proc_init); >> 317 return -SOS_ENOMEM; >> 318 } >> 319 >> 320 sos_process_unref(proc_init); >> 321 return SOS_OK; >> 322 } >> 323 >> 324 >> 325 /* ====================================================================== 309 * The C entry point of our operating system 326 * The C entry point of our operating system 310 */ 327 */ 311 void sos_main(unsigned long magic, unsigned lo 328 void sos_main(unsigned long magic, unsigned long addr) 312 { 329 { 313 unsigned i; 330 unsigned i; 314 sos_paddr_t sos_kernel_core_base_paddr, sos_ 331 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 315 struct sos_time tick_resolution; 332 struct sos_time tick_resolution; 316 333 317 /* Grub sends us a structure, called multibo 334 /* Grub sends us a structure, called multiboot_info_t with a lot of 318 precious informations about the system, s 335 precious informations about the system, see the multiboot 319 documentation for more information. */ 336 documentation for more information. */ 320 multiboot_info_t *mbi; 337 multiboot_info_t *mbi; 321 mbi = (multiboot_info_t *) addr; 338 mbi = (multiboot_info_t *) addr; 322 339 323 /* Setup bochs and console, and clear the co 340 /* Setup bochs and console, and clear the console */ 324 sos_bochs_setup(); 341 sos_bochs_setup(); 325 342 326 sos_x86_videomem_setup(); 343 sos_x86_videomem_setup(); 327 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 344 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 328 345 329 /* Greetings from SOS */ 346 /* Greetings from SOS */ 330 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 347 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 331 /* Loaded with Grub */ 348 /* Loaded with Grub */ 332 sos_x86_videomem_printf(1, 0, 349 sos_x86_videomem_printf(1, 0, 333 SOS_X86_VIDEO_FG_Y 350 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 334 "Welcome From GRUB 351 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 335 "SOS article 6.5", !! 352 "SOS article 7.5", ',', 336 (unsigned)(mbi->me 353 (unsigned)(mbi->mem_upper >> 10) + 1, 337 (unsigned)mbi->mem 354 (unsigned)mbi->mem_upper); 338 else 355 else 339 /* Not loaded with grub */ 356 /* Not loaded with grub */ 340 sos_x86_videomem_printf(1, 0, 357 sos_x86_videomem_printf(1, 0, 341 SOS_X86_VIDEO_FG_Y 358 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 342 "Welcome to SOS ar !! 359 "Welcome to SOS article 7.5"); 343 360 344 sos_bochs_putstring("Message in a bochs: Thi !! 361 sos_bochs_putstring("Message in a bochs: This is SOS article 7.5.\n"); 345 362 346 /* Setup CPU segmentation and IRQ subsystem 363 /* Setup CPU segmentation and IRQ subsystem */ 347 sos_gdt_subsystem_setup(); 364 sos_gdt_subsystem_setup(); 348 sos_idt_subsystem_setup(); 365 sos_idt_subsystem_setup(); 349 366 350 /* Setup SOS IRQs and exceptions subsystem * 367 /* Setup SOS IRQs and exceptions subsystem */ 351 sos_exception_subsystem_setup(); 368 sos_exception_subsystem_setup(); 352 sos_irq_subsystem_setup(); 369 sos_irq_subsystem_setup(); 353 370 354 /* Configure the timer so as to raise the IR 371 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 355 sos_i8254_set_frequency(100); 372 sos_i8254_set_frequency(100); 356 373 357 /* Setup the kernel time subsystem to get pr 374 /* Setup the kernel time subsystem to get prepared to take the timer 358 ticks into account */ 375 ticks into account */ 359 tick_resolution = (struct sos_time) { .sec=0 376 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 360 sos_time_subsysem_setup(& tick_resolution); 377 sos_time_subsysem_setup(& tick_resolution); 361 378 362 /* We need a multiboot-compliant boot loader 379 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 363 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 380 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 364 { 381 { 365 sos_x86_videomem_putstring(20, 0, 382 sos_x86_videomem_putstring(20, 0, 366 SOS_X86_VIDEO 383 SOS_X86_VIDEO_FG_LTRED 367 | SOS_X86_V 384 | SOS_X86_VIDEO_BG_BLUE 368 | SOS_X86_V 385 | SOS_X86_VIDEO_FG_BLINKING, 369 "I'm not load 386 "I'm not loaded with Grub !"); 370 /* STOP ! */ 387 /* STOP ! */ 371 for (;;) 388 for (;;) 372 continue; 389 continue; 373 } 390 } 374 391 375 /* 392 /* 376 * Some interrupt handlers 393 * Some interrupt handlers 377 */ 394 */ 378 395 379 /* Binding some HW interrupts and exceptions 396 /* Binding some HW interrupts and exceptions to software routines */ 380 sos_irq_set_routine(SOS_IRQ_TIMER, 397 sos_irq_set_routine(SOS_IRQ_TIMER, 381 clk_it); 398 clk_it); 382 399 383 /* 400 /* 384 * Setup physical memory management 401 * Setup physical memory management 385 */ 402 */ 386 403 387 /* Multiboot says: "The value returned for u 404 /* Multiboot says: "The value returned for upper memory is maximally 388 the address of the first upper memory hol 405 the address of the first upper memory hole minus 1 megabyte.". It 389 also adds: "It is not guaranteed to be th 406 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 390 sos_physmem_subsystem_setup((mbi->mem_upper< 407 sos_physmem_subsystem_setup((mbi->mem_upper<<10) + (1<<20), 391 & sos_kernel_cor 408 & sos_kernel_core_base_paddr, 392 & sos_kernel_cor 409 & sos_kernel_core_top_paddr); 393 410 394 /* 411 /* 395 * Switch to paged-memory mode 412 * Switch to paged-memory mode 396 */ 413 */ 397 414 398 /* Disabling interrupts should seem more cor 415 /* Disabling interrupts should seem more correct, but it's not really 399 necessary at this stage */ 416 necessary at this stage */ 400 SOS_ASSERT_FATAL(SOS_OK == 417 SOS_ASSERT_FATAL(SOS_OK == 401 sos_paging_subsystem_setup( 418 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 402 419 sos_kernel_core_top_paddr)); 403 420 404 /* Bind the page fault exception */ 421 /* Bind the page fault exception */ 405 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 422 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 406 pgflt_ex); 423 pgflt_ex); 407 424 408 /* 425 /* 409 * Setup kernel virtual memory allocator 426 * Setup kernel virtual memory allocator 410 */ 427 */ 411 428 412 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 429 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 413 sos_kernel_ 430 sos_kernel_core_top_paddr, 414 bootstrap_s 431 bootstrap_stack_bottom, 415 bootstrap_s 432 bootstrap_stack_bottom 416 + bootstrap 433 + bootstrap_stack_size)) 417 sos_bochs_printf("Could not setup the Kern 434 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 418 435 419 if (sos_kmalloc_subsystem_setup()) 436 if (sos_kmalloc_subsystem_setup()) 420 sos_bochs_printf("Could not setup the Kmal 437 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 421 438 422 /* 439 /* >> 440 * Initialize the MMU context subsystem >> 441 */ >> 442 sos_mm_context_subsystem_setup(); >> 443 >> 444 /* >> 445 * Initialize the CPU context subsystem >> 446 */ >> 447 sos_cpu_context_subsystem_setup(); >> 448 >> 449 /* >> 450 * Bind the syscall handler to its software interrupt handler >> 451 */ >> 452 sos_swintr_subsystem_setup(); >> 453 >> 454 >> 455 /* 423 * Initialize the Kernel thread and schedule 456 * Initialize the Kernel thread and scheduler subsystems 424 */ 457 */ 425 458 426 /* Initialize kernel thread subsystem */ 459 /* Initialize kernel thread subsystem */ 427 sos_thread_subsystem_setup(bootstrap_stack_b 460 sos_thread_subsystem_setup(bootstrap_stack_bottom, 428 bootstrap_stack_s 461 bootstrap_stack_size); 429 462 430 /* Initialize the scheduler */ 463 /* Initialize the scheduler */ 431 sos_sched_subsystem_setup(); 464 sos_sched_subsystem_setup(); 432 465 433 /* Declare the IDLE thread */ 466 /* Declare the IDLE thread */ 434 SOS_ASSERT_FATAL(sos_create_kernel_thread("i !! 467 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, >> 468 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 469 >> 470 /* Prepare the stats subsystem */ >> 471 sos_load_subsystem_setup(); >> 472 >> 473 /* Declare a thread that prints some stats */ >> 474 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, >> 475 NULL, >> 476 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 477 >> 478 >> 479 /* >> 480 * Initialise user address space management subsystem >> 481 */ >> 482 sos_umem_vmm_subsystem_setup(); >> 483 sos_dev_zero_subsystem_setup(); >> 484 >> 485 /* >> 486 * Initialize process stuff >> 487 */ >> 488 sos_process_subsystem_setup(); >> 489 435 490 436 /* Enabling the HW interrupts here, this wil 491 /* Enabling the HW interrupts here, this will make the timer HW 437 interrupt call the scheduler */ 492 interrupt call the scheduler */ 438 asm volatile ("sti\n"); 493 asm volatile ("sti\n"); 439 494 440 !! 495 /* Start the 'init' process, which in turns launches the other 441 /* Now run some Kernel threads just for fun !! 496 programs */ 442 extern void MouseSim(); !! 497 start_init(); 443 MouseSim(); << 444 test_thread(); << 445 498 446 /* 499 /* 447 * We can safely exit from this function now 500 * We can safely exit from this function now, for there is already 448 * an idle Kernel thread ready to make the C 501 * an idle Kernel thread ready to make the CPU busy working... 449 * 502 * 450 * However, we must EXPLICITELY call sos_thr 503 * However, we must EXPLICITELY call sos_thread_exit() because a 451 * simple "return" will return nowhere ! Act 504 * simple "return" will return nowhere ! Actually this first thread 452 * was initialized by the Grub bootstrap sta 505 * was initialized by the Grub bootstrap stage, at a time when the 453 * word "thread" did not exist. This means t 506 * word "thread" did not exist. This means that the stack was not 454 * setup in order for a return here to call 507 * setup in order for a return here to call sos_thread_exit() 455 * automagically. Hence we must call it manu 508 * automagically. Hence we must call it manually. This is the ONLY 456 * kernel thread where we must do this manua 509 * kernel thread where we must do this manually. 457 */ 510 */ 458 sos_bochs_printf("Bye from primary thread !\ 511 sos_bochs_printf("Bye from primary thread !\n"); 459 sos_thread_exit(); 512 sos_thread_exit(); 460 SOS_FATAL_ERROR("No trespassing !"); 513 SOS_FATAL_ERROR("No trespassing !"); 461 } 514 }
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