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