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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> << 031 #include <sos/kmem_vmm.h> 029 #include <sos/kmem_vmm.h> 032 #include <sos/kmalloc.h> 030 #include <sos/kmalloc.h> 033 #include <sos/time.h> 031 #include <sos/time.h> 034 #include <sos/thread.h> 032 #include <sos/thread.h> 035 #include <sos/process.h> << 036 #include <sos/klibc.h> 033 #include <sos/klibc.h> 037 #include <sos/assert.h> 034 #include <sos/assert.h> 038 #include <drivers/x86_videomem.h> 035 #include <drivers/x86_videomem.h> 039 #include <drivers/bochs.h> 036 #include <drivers/bochs.h> 040 #include <sos/calcload.h> << 041 037 042 038 043 /* Helper function to display each bits of a 3 039 /* Helper function to display each bits of a 32bits integer on the 044 screen as dark or light carrets */ 040 screen as dark or light carrets */ 045 void display_bits(unsigned char row, unsigned 041 void display_bits(unsigned char row, unsigned char col, 046 unsigned char attribute, 042 unsigned char attribute, 047 sos_ui32_t integer) 043 sos_ui32_t integer) 048 { 044 { 049 int i; 045 int i; 050 /* Scan each bit of the integer, MSb first * 046 /* Scan each bit of the integer, MSb first */ 051 for (i = 31 ; i >= 0 ; i--) 047 for (i = 31 ; i >= 0 ; i--) 052 { 048 { 053 /* Test if bit i of 'integer' is set */ 049 /* Test if bit i of 'integer' is set */ 054 int bit_i = (integer & (1 << i)); 050 int bit_i = (integer & (1 << i)); 055 /* Ascii 219 => dark carret, Ascii 177 = 051 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 056 unsigned char ascii_code = bit_i?219:177 052 unsigned char ascii_code = bit_i?219:177; 057 sos_x86_videomem_putchar(row, col++, 053 sos_x86_videomem_putchar(row, col++, 058 attribute, 054 attribute, 059 ascii_code); 055 ascii_code); 060 } 056 } 061 } 057 } 062 058 063 059 064 /* Clock IRQ handler */ 060 /* Clock IRQ handler */ 065 static void clk_it(int intid) 061 static void clk_it(int intid) 066 { 062 { 067 static sos_ui32_t clock_count = 0; 063 static sos_ui32_t clock_count = 0; 068 064 069 display_bits(0, 48, 065 display_bits(0, 48, 070 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 066 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 071 clock_count); 067 clock_count); 072 clock_count++; 068 clock_count++; 073 069 074 /* Execute the expired timeout actions (if a 070 /* Execute the expired timeout actions (if any) */ 075 sos_time_do_tick(); 071 sos_time_do_tick(); 076 << 077 /* Update scheduler statistics and status */ << 078 sos_sched_do_timer_tick(); << 079 } 072 } 080 073 081 074 082 /* =========================================== 075 /* ====================================================================== 083 * Page fault exception handling 076 * Page fault exception handling 084 */ 077 */ 085 078 >> 079 /* Helper function to dump a backtrace on bochs and/or the console */ >> 080 static void dump_backtrace(const struct sos_cpu_state *cpu_state, >> 081 sos_vaddr_t stack_bottom, >> 082 sos_size_t stack_size, >> 083 sos_bool_t on_console, >> 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, *arg2, *arg3, *arg4; >> 092 >> 093 /* Get the address of the first 3 arguments from the >> 094 frame. Among these arguments, 0, 1, 2, 3 arguments might be >> 095 meaningful (depending on how many arguments the function may >> 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 arguments fit inside the >> 103 stack boundaries */ >> 104 #define INTERVAL_OK(b,v,u) ( ((b) <= (sos_vaddr_t)(v)) \ >> 105 && ((sos_vaddr_t)(v) < (u)) ) >> 106 if (!INTERVAL_OK(stack_bottom, arg1, stack_bottom + stack_size)) >> 107 arg1 = &invalid; >> 108 if (!INTERVAL_OK(stack_bottom, arg2, stack_bottom + stack_size)) >> 109 arg2 = &invalid; >> 110 if (!INTERVAL_OK(stack_bottom, arg3, stack_bottom + stack_size)) >> 111 arg3 = &invalid; >> 112 if (!INTERVAL_OK(stack_bottom, arg4, stack_bottom + stack_size)) >> 113 arg4 = &invalid; >> 114 >> 115 /* Print the function context for this frame */ >> 116 if (on_bochs) >> 117 sos_bochs_printf("[%d] PC=0x%x arg1=0x%x arg2=0x%x arg3=0x%x\n", >> 118 (unsigned)depth, (unsigned)PC, >> 119 (unsigned)*arg1, (unsigned)*arg2, >> 120 (unsigned)*arg3); >> 121 >> 122 if (on_console) >> 123 sos_x86_videomem_printf(23-depth, 3, >> 124 SOS_X86_VIDEO_BG_BLUE >> 125 | SOS_X86_VIDEO_FG_LTGREEN, >> 126 "[%d] PC=0x%x arg1=0x%x arg2=0x%x arg3=0x%x arg4=0x%x", >> 127 (unsigned)depth, PC, >> 128 (unsigned)*arg1, (unsigned)*arg2, >> 129 (unsigned)*arg3, (unsigned)*arg4); >> 130 >> 131 } >> 132 >> 133 sos_backtrace(cpu_state, 15, stack_bottom, stack_size, backtracer, NULL); >> 134 } >> 135 086 136 087 /* Page fault exception handler with demand pa 137 /* Page fault exception handler with demand paging for the kernel */ 088 static void pgflt_ex(int intid, struct sos_cpu !! 138 static void pgflt_ex(int intid, const struct sos_cpu_state *ctxt) 089 { 139 { 090 static sos_ui32_t demand_paging_count = 0; 140 static sos_ui32_t demand_paging_count = 0; 091 sos_vaddr_t faulting_vaddr = sos_cpu_contex !! 141 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 092 sos_paddr_t ppage_paddr; 142 sos_paddr_t ppage_paddr; 093 143 094 if (sos_cpu_context_is_in_user_mode(ctxt)) << 095 { << 096 /* User-mode page faults are considered << 097 moment */ << 098 sos_bochs_printf("Unresolved USER page F << 099 sos_cpu_context_get_PC( << 100 (unsigned)faulting_vadd << 101 (unsigned)sos_cpu_conte << 102 sos_bochs_printf("Terminating User threa << 103 sos_thread_exit(); << 104 } << 105 << 106 /* Check if address is covered by any VMM ra 144 /* Check if address is covered by any VMM range */ 107 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 145 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 108 { 146 { 109 /* No: The page fault is out of any kern 147 /* No: The page fault is out of any kernel virtual region. For 110 the moment, we don't handle this. */ 148 the moment, we don't handle this. */ >> 149 dump_backtrace(ctxt, >> 150 bootstrap_stack_bottom, >> 151 bootstrap_stack_size, >> 152 TRUE, TRUE); 111 sos_display_fatal_error("Unresolved page 153 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", 112 sos_cpu_context_ 154 sos_cpu_context_get_PC(ctxt), 113 (unsigned)faulti 155 (unsigned)faulting_vaddr, 114 (unsigned)sos_cp 156 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 115 SOS_ASSERT_FATAL(! "Got page fault (note 157 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 116 } 158 } 117 159 118 160 119 /* 161 /* 120 * Demand paging in kernel space !! 162 * Demand paging 121 */ 163 */ 122 164 123 /* Update the number of demand paging reques 165 /* Update the number of demand paging requests handled */ 124 demand_paging_count ++; 166 demand_paging_count ++; 125 display_bits(0, 0, 167 display_bits(0, 0, 126 SOS_X86_VIDEO_FG_LTRED | SOS_X8 168 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 127 demand_paging_count); 169 demand_paging_count); 128 170 129 /* Allocate a new page for the virtual addre 171 /* Allocate a new page for the virtual address */ 130 ppage_paddr = sos_physmem_ref_physpage_new(F 172 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 131 if (! ppage_paddr) 173 if (! ppage_paddr) 132 SOS_ASSERT_FATAL(! "TODO: implement swap. 174 SOS_ASSERT_FATAL(! "TODO: implement swap. (Out of mem in demand paging because no swap for kernel yet !)"); 133 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 175 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 134 SO 176 SOS_PAGE_ALIGN_INF(faulting_vaddr), 135 FA 177 FALSE, 136 SO 178 SOS_VM_MAP_PROT_READ 137 | 179 | SOS_VM_MAP_PROT_WRITE 138 | 180 | SOS_VM_MAP_ATOMIC)); 139 sos_physmem_unref_physpage(ppage_paddr); 181 sos_physmem_unref_physpage(ppage_paddr); 140 182 141 /* Ok, we can now return to interrupted cont 183 /* Ok, we can now return to interrupted context */ 142 } 184 } 143 185 144 186 145 /* =========================================== 187 /* ====================================================================== 146 * Demonstrate the use of SOS kernel threads 188 * Demonstrate the use of SOS kernel threads 147 * - Kernel Threads are created with various 189 * - Kernel Threads are created with various priorities and their 148 * state is printed on both the console and 190 * state is printed on both the console and the bochs' 0xe9 port 149 * - For tests regarding threads' synchroniza 191 * - For tests regarding threads' synchronization, see mouse_sim.c 150 */ 192 */ 151 193 152 struct thr_arg 194 struct thr_arg 153 { 195 { 154 char character; 196 char character; 155 int color; 197 int color; 156 198 157 int col; 199 int col; 158 int row; 200 int row; 159 }; 201 }; 160 202 161 203 162 static void demo_thread(void *arg) 204 static void demo_thread(void *arg) 163 { 205 { 164 struct thr_arg *thr_arg = (struct thr_arg*)a 206 struct thr_arg *thr_arg = (struct thr_arg*)arg; 165 int progress = 0; 207 int progress = 0; 166 208 167 sos_bochs_printf("start %c", thr_arg->charac 209 sos_bochs_printf("start %c", thr_arg->character); 168 while (1) 210 while (1) 169 { 211 { 170 progress ++; 212 progress ++; 171 display_bits(thr_arg->row, thr_arg->col+ 213 display_bits(thr_arg->row, thr_arg->col+1, thr_arg->color, progress); 172 214 173 sos_bochs_putchar(thr_arg->character); 215 sos_bochs_putchar(thr_arg->character); 174 216 175 /* Yield the CPU to another thread somet 217 /* Yield the CPU to another thread sometimes... */ 176 if ((random() % 100) == 0) 218 if ((random() % 100) == 0) 177 { 219 { 178 sos_bochs_printf("[37myield(%c)[m\ 220 sos_bochs_printf("[37myield(%c)[m\n", thr_arg->character); 179 sos_x86_videomem_putchar(thr_arg->ro 221 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'Y'); 180 SOS_ASSERT_FATAL(SOS_OK == sos_threa 222 SOS_ASSERT_FATAL(SOS_OK == sos_thread_yield()); 181 sos_x86_videomem_putchar(thr_arg->ro 223 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); 182 } 224 } 183 225 184 /* Go to sleep some other times... */ 226 /* Go to sleep some other times... */ 185 else if ((random() % 200) == 0) 227 else if ((random() % 200) == 0) 186 { 228 { 187 struct sos_time t = (struct sos_time 229 struct sos_time t = (struct sos_time){ .sec=0, .nanosec=50000000 }; 188 sos_bochs_printf("[37msleep1(%c)[m 230 sos_bochs_printf("[37msleep1(%c)[m\n", thr_arg->character); 189 sos_x86_videomem_putchar(thr_arg->ro 231 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 's'); 190 SOS_ASSERT_FATAL(SOS_OK == sos_threa 232 SOS_ASSERT_FATAL(SOS_OK == sos_thread_sleep(& t)); 191 SOS_ASSERT_FATAL(sos_time_is_zero(& 233 SOS_ASSERT_FATAL(sos_time_is_zero(& t)); 192 sos_x86_videomem_putchar(thr_arg->ro 234 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); 193 } 235 } 194 236 195 /* Go to sleep for a longer time some ot 237 /* Go to sleep for a longer time some other times... */ 196 else if ((random() % 300) == 0) 238 else if ((random() % 300) == 0) 197 { 239 { 198 struct sos_time t = (struct sos_time 240 struct sos_time t = (struct sos_time){ .sec=0, .nanosec=300000000 }; 199 sos_bochs_printf("[37msleep2(%c)[m 241 sos_bochs_printf("[37msleep2(%c)[m\n", thr_arg->character); 200 sos_x86_videomem_putchar(thr_arg->ro 242 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'S'); 201 SOS_ASSERT_FATAL(SOS_OK == sos_threa 243 SOS_ASSERT_FATAL(SOS_OK == sos_thread_sleep(& t)); 202 SOS_ASSERT_FATAL(sos_time_is_zero(& 244 SOS_ASSERT_FATAL(sos_time_is_zero(& t)); 203 sos_x86_videomem_putchar(thr_arg->ro 245 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); 204 } 246 } 205 247 206 /* Infinite loop otherwise */ 248 /* Infinite loop otherwise */ 207 } 249 } 208 } 250 } 209 251 210 252 211 static void test_thread() 253 static void test_thread() 212 { 254 { 213 /* "static" variables because we want them t 255 /* "static" variables because we want them to remain even when the 214 function returns */ 256 function returns */ 215 static struct thr_arg arg_b, arg_c, arg_d, a 257 static struct thr_arg arg_b, arg_c, arg_d, arg_e, arg_R, arg_S; 216 sos_ui32_t flags; 258 sos_ui32_t flags; 217 259 218 sos_disable_IRQs(flags); 260 sos_disable_IRQs(flags); 219 261 220 arg_b = (struct thr_arg) { .character='b', . 262 arg_b = (struct thr_arg) { .character='b', .col=0, .row=21, .color=0x14 }; 221 sos_create_kernel_thread("YO[b]", demo_threa !! 263 sos_create_kernel_thread("YO[b]", demo_thread, (void*)&arg_b); 222 264 223 arg_c = (struct thr_arg) { .character='c', . 265 arg_c = (struct thr_arg) { .character='c', .col=46, .row=21, .color=0x14 }; 224 sos_create_kernel_thread("YO[c]", demo_threa !! 266 sos_create_kernel_thread("YO[c]", demo_thread, (void*)&arg_c); 225 267 226 arg_d = (struct thr_arg) { .character='d', . 268 arg_d = (struct thr_arg) { .character='d', .col=0, .row=20, .color=0x14 }; 227 sos_create_kernel_thread("YO[d]", demo_threa !! 269 sos_create_kernel_thread("YO[d]", demo_thread, (void*)&arg_d); 228 270 229 arg_e = (struct thr_arg) { .character='e', . 271 arg_e = (struct thr_arg) { .character='e', .col=0, .row=19, .color=0x14 }; 230 sos_create_kernel_thread("YO[e]", demo_threa !! 272 sos_create_kernel_thread("YO[e]", demo_thread, (void*)&arg_e); 231 273 232 arg_R = (struct thr_arg) { .character='R', . 274 arg_R = (struct thr_arg) { .character='R', .col=0, .row=17, .color=0x1c }; 233 sos_create_kernel_thread("YO[R]", demo_threa !! 275 sos_create_kernel_thread("YO[R]", demo_thread, (void*)&arg_R); 234 276 235 arg_S = (struct thr_arg) { .character='S', . 277 arg_S = (struct thr_arg) { .character='S', .col=0, .row=16, .color=0x1c }; 236 sos_create_kernel_thread("YO[S]", demo_threa !! 278 sos_create_kernel_thread("YO[S]", demo_thread, (void*)&arg_S); 237 279 238 sos_restore_IRQs(flags); 280 sos_restore_IRQs(flags); 239 } 281 } 240 282 241 283 242 /* =========================================== 284 /* ====================================================================== 243 * An operating system MUST always have a read 285 * An operating system MUST always have a ready thread ! Otherwise: 244 * what would the CPU have to execute ?! 286 * what would the CPU have to execute ?! 245 */ 287 */ 246 static void idle_thread() 288 static void idle_thread() 247 { 289 { 248 sos_ui32_t idle_twiddle = 0; 290 sos_ui32_t idle_twiddle = 0; 249 291 250 while (1) 292 while (1) 251 { 293 { 252 /* Remove this instruction if you get an 294 /* Remove this instruction if you get an "Invalid opcode" CPU 253 exception (old 80386 CPU) */ 295 exception (old 80386 CPU) */ 254 asm("hlt\n"); 296 asm("hlt\n"); 255 297 256 idle_twiddle ++; 298 idle_twiddle ++; 257 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE 299 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 258 idle_twiddle); 300 idle_twiddle); 259 301 260 /* Lend the CPU to some other thread */ 302 /* Lend the CPU to some other thread */ 261 sos_thread_yield(); 303 sos_thread_yield(); 262 } 304 } 263 } 305 } 264 306 265 307 266 /* =========================================== 308 /* ====================================================================== 267 * Kernel thread showing some CPU usage statis << 268 */ << 269 static void stat_thread() << 270 { << 271 while (1) << 272 { << 273 sos_ui32_t flags; << 274 sos_ui32_t load1, load5, load15; << 275 char str1[11], str5[11], str15[11]; << 276 struct sos_time t; << 277 t.sec = 1; << 278 t.nanosec = 0; << 279 << 280 sos_thread_sleep(& t); << 281 << 282 sos_disable_IRQs(flags); << 283 << 284 /* The IDLE task is EXcluded in the foll << 285 sos_load_get_sload(&load1, &load5, &load << 286 sos_load_to_string(str1, load1); << 287 sos_load_to_string(str5, load5); << 288 sos_load_to_string(str15, load15); << 289 sos_x86_videomem_printf(16, 34, << 290 SOS_X86_VIDEO_FG << 291 "Kernel (- Idle) << 292 str1, str5, str1 << 293 << 294 sos_load_get_uload(&load1, &load5, &load << 295 sos_load_to_string(str1, load1); << 296 sos_load_to_string(str5, load5); << 297 sos_load_to_string(str15, load15); << 298 sos_x86_videomem_printf(17, 34, << 299 SOS_X86_VIDEO_FG << 300 "User: %s %s %s << 301 str1, str5, str1 << 302 << 303 sos_load_get_uratio(&load1, &load5, &loa << 304 sos_load_to_string(str1, load1); << 305 sos_load_to_string(str5, load5); << 306 sos_load_to_string(str15, load15); << 307 sos_x86_videomem_printf(18, 34, << 308 SOS_X86_VIDEO_FG << 309 "User CPU %%: %s << 310 str1, str5, str1 << 311 << 312 /* The IDLE task is INcluded in the foll << 313 sos_load_get_sratio(&load1, &load5, &loa << 314 sos_load_to_string(str1, load1); << 315 sos_load_to_string(str5, load5); << 316 sos_load_to_string(str15, load15); << 317 sos_x86_videomem_printf(19, 34, << 318 SOS_X86_VIDEO_FG << 319 "Kernel CPU %% ( << 320 str1, str5, str1 << 321 sos_restore_IRQs(flags); << 322 } << 323 } << 324 << 325 << 326 /* =========================================== << 327 * The C entry point of our operating system 309 * The C entry point of our operating system 328 */ 310 */ 329 void sos_main(unsigned long magic, unsigned lo 311 void sos_main(unsigned long magic, unsigned long addr) 330 { 312 { 331 unsigned i; 313 unsigned i; 332 sos_paddr_t sos_kernel_core_base_paddr, sos_ 314 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 333 struct sos_time tick_resolution; 315 struct sos_time tick_resolution; 334 316 335 /* Grub sends us a structure, called multibo 317 /* Grub sends us a structure, called multiboot_info_t with a lot of 336 precious informations about the system, s 318 precious informations about the system, see the multiboot 337 documentation for more information. */ 319 documentation for more information. */ 338 multiboot_info_t *mbi; 320 multiboot_info_t *mbi; 339 mbi = (multiboot_info_t *) addr; 321 mbi = (multiboot_info_t *) addr; 340 322 341 /* Setup bochs and console, and clear the co 323 /* Setup bochs and console, and clear the console */ 342 sos_bochs_setup(); 324 sos_bochs_setup(); 343 325 344 sos_x86_videomem_setup(); 326 sos_x86_videomem_setup(); 345 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 327 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 346 328 347 /* Greetings from SOS */ 329 /* Greetings from SOS */ 348 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 330 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 349 /* Loaded with Grub */ 331 /* Loaded with Grub */ 350 sos_x86_videomem_printf(1, 0, 332 sos_x86_videomem_printf(1, 0, 351 SOS_X86_VIDEO_FG_Y 333 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 352 "Welcome From GRUB 334 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 353 "SOS article 7", ' !! 335 "SOS article 6.5", ',', 354 (unsigned)(mbi->me 336 (unsigned)(mbi->mem_upper >> 10) + 1, 355 (unsigned)mbi->mem 337 (unsigned)mbi->mem_upper); 356 else 338 else 357 /* Not loaded with grub */ 339 /* Not loaded with grub */ 358 sos_x86_videomem_printf(1, 0, 340 sos_x86_videomem_printf(1, 0, 359 SOS_X86_VIDEO_FG_Y 341 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 360 "Welcome to SOS ar !! 342 "Welcome to SOS article 6.5"); 361 343 362 sos_bochs_putstring("Message in a bochs: Thi !! 344 sos_bochs_putstring("Message in a bochs: This is SOS article 6.5.\n"); 363 345 364 /* Setup CPU segmentation and IRQ subsystem 346 /* Setup CPU segmentation and IRQ subsystem */ 365 sos_gdt_subsystem_setup(); 347 sos_gdt_subsystem_setup(); 366 sos_idt_subsystem_setup(); 348 sos_idt_subsystem_setup(); 367 349 368 /* Setup SOS IRQs and exceptions subsystem * 350 /* Setup SOS IRQs and exceptions subsystem */ 369 sos_exception_subsystem_setup(); 351 sos_exception_subsystem_setup(); 370 sos_irq_subsystem_setup(); 352 sos_irq_subsystem_setup(); 371 353 372 /* Configure the timer so as to raise the IR 354 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 373 sos_i8254_set_frequency(100); 355 sos_i8254_set_frequency(100); 374 356 375 /* Setup the kernel time subsystem to get pr 357 /* Setup the kernel time subsystem to get prepared to take the timer 376 ticks into account */ 358 ticks into account */ 377 tick_resolution = (struct sos_time) { .sec=0 359 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 378 sos_time_subsysem_setup(& tick_resolution); 360 sos_time_subsysem_setup(& tick_resolution); 379 361 380 /* We need a multiboot-compliant boot loader 362 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 381 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 363 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 382 { 364 { 383 sos_x86_videomem_putstring(20, 0, 365 sos_x86_videomem_putstring(20, 0, 384 SOS_X86_VIDEO 366 SOS_X86_VIDEO_FG_LTRED 385 | SOS_X86_V 367 | SOS_X86_VIDEO_BG_BLUE 386 | SOS_X86_V 368 | SOS_X86_VIDEO_FG_BLINKING, 387 "I'm not load 369 "I'm not loaded with Grub !"); 388 /* STOP ! */ 370 /* STOP ! */ 389 for (;;) 371 for (;;) 390 continue; 372 continue; 391 } 373 } 392 374 393 /* 375 /* 394 * Some interrupt handlers 376 * Some interrupt handlers 395 */ 377 */ 396 378 397 /* Binding some HW interrupts and exceptions 379 /* Binding some HW interrupts and exceptions to software routines */ 398 sos_irq_set_routine(SOS_IRQ_TIMER, 380 sos_irq_set_routine(SOS_IRQ_TIMER, 399 clk_it); 381 clk_it); 400 382 401 /* 383 /* 402 * Setup physical memory management 384 * Setup physical memory management 403 */ 385 */ 404 386 405 /* Multiboot says: "The value returned for u 387 /* Multiboot says: "The value returned for upper memory is maximally 406 the address of the first upper memory hol 388 the address of the first upper memory hole minus 1 megabyte.". It 407 also adds: "It is not guaranteed to be th 389 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 408 sos_physmem_subsystem_setup((mbi->mem_upper< 390 sos_physmem_subsystem_setup((mbi->mem_upper<<10) + (1<<20), 409 & sos_kernel_cor 391 & sos_kernel_core_base_paddr, 410 & sos_kernel_cor 392 & sos_kernel_core_top_paddr); 411 393 412 /* 394 /* 413 * Switch to paged-memory mode 395 * Switch to paged-memory mode 414 */ 396 */ 415 397 416 /* Disabling interrupts should seem more cor 398 /* Disabling interrupts should seem more correct, but it's not really 417 necessary at this stage */ 399 necessary at this stage */ 418 SOS_ASSERT_FATAL(SOS_OK == 400 SOS_ASSERT_FATAL(SOS_OK == 419 sos_paging_subsystem_setup( 401 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 420 402 sos_kernel_core_top_paddr)); 421 403 422 /* Bind the page fault exception */ 404 /* Bind the page fault exception */ 423 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 405 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 424 pgflt_ex); 406 pgflt_ex); 425 407 426 /* 408 /* 427 * Setup kernel virtual memory allocator 409 * Setup kernel virtual memory allocator 428 */ 410 */ 429 411 430 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 412 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 431 sos_kernel_ 413 sos_kernel_core_top_paddr, 432 bootstrap_s 414 bootstrap_stack_bottom, 433 bootstrap_s 415 bootstrap_stack_bottom 434 + bootstrap 416 + bootstrap_stack_size)) 435 sos_bochs_printf("Could not setup the Kern 417 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 436 418 437 if (sos_kmalloc_subsystem_setup()) 419 if (sos_kmalloc_subsystem_setup()) 438 sos_bochs_printf("Could not setup the Kmal 420 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 439 421 440 /* 422 /* 441 * Initialize the MMU context subsystem << 442 */ << 443 sos_mm_context_subsystem_setup(); << 444 << 445 /* << 446 * Initialize the CPU context subsystem << 447 */ << 448 sos_cpu_context_subsystem_setup(); << 449 << 450 /* << 451 * Bind the syscall handler to its software << 452 */ << 453 sos_swintr_subsystem_setup(); << 454 << 455 << 456 /* << 457 * Initialize the Kernel thread and schedule 423 * Initialize the Kernel thread and scheduler subsystems 458 */ 424 */ 459 425 460 /* Initialize kernel thread subsystem */ 426 /* Initialize kernel thread subsystem */ 461 sos_thread_subsystem_setup(bootstrap_stack_b 427 sos_thread_subsystem_setup(bootstrap_stack_bottom, 462 bootstrap_stack_s 428 bootstrap_stack_size); 463 429 464 /* Initialize the scheduler */ 430 /* Initialize the scheduler */ 465 sos_sched_subsystem_setup(); 431 sos_sched_subsystem_setup(); 466 432 467 /* Declare the IDLE thread */ 433 /* Declare the IDLE thread */ 468 SOS_ASSERT_FATAL(sos_create_kernel_thread("i !! 434 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL) != NULL); 469 SO << 470 << 471 /* Prepare the stats subsystem */ << 472 sos_load_subsystem_setup(); << 473 << 474 /* Declare a thread that prints some stats * << 475 SOS_ASSERT_FATAL(sos_create_kernel_thread("s << 476 NU << 477 SO << 478 << 479 << 480 /* << 481 * Initialize process stuff << 482 */ << 483 sos_process_subsystem_setup(); << 484 << 485 435 486 /* Enabling the HW interrupts here, this wil 436 /* Enabling the HW interrupts here, this will make the timer HW 487 interrupt call the scheduler */ 437 interrupt call the scheduler */ 488 asm volatile ("sti\n"); 438 asm volatile ("sti\n"); 489 439 490 /* Run some tests involving USER processes a << 491 extern void test_art7(); << 492 test_art7(); << 493 440 494 /* Now run some Kernel threads just for fun 441 /* Now run some Kernel threads just for fun ! */ 495 extern void MouseSim(); 442 extern void MouseSim(); 496 MouseSim(); 443 MouseSim(); 497 test_thread(); 444 test_thread(); 498 445 499 /* 446 /* 500 * We can safely exit from this function now 447 * We can safely exit from this function now, for there is already 501 * an idle Kernel thread ready to make the C 448 * an idle Kernel thread ready to make the CPU busy working... 502 * 449 * 503 * However, we must EXPLICITELY call sos_thr 450 * However, we must EXPLICITELY call sos_thread_exit() because a 504 * simple "return" will return nowhere ! Act 451 * simple "return" will return nowhere ! Actually this first thread 505 * was initialized by the Grub bootstrap sta 452 * was initialized by the Grub bootstrap stage, at a time when the 506 * word "thread" did not exist. This means t 453 * word "thread" did not exist. This means that the stack was not 507 * setup in order for a return here to call 454 * setup in order for a return here to call sos_thread_exit() 508 * automagically. Hence we must call it manu 455 * automagically. Hence we must call it manually. This is the ONLY 509 * kernel thread where we must do this manua 456 * kernel thread where we must do this manually. 510 */ 457 */ 511 sos_bochs_printf("Bye from primary thread !\ 458 sos_bochs_printf("Bye from primary thread !\n"); 512 sos_thread_exit(); 459 sos_thread_exit(); 513 SOS_FATAL_ERROR("No trespassing !"); 460 SOS_FATAL_ERROR("No trespassing !"); 514 } 461 }
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