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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/umem_vmm.h> << 037 #include <sos/klibc.h> 033 #include <sos/klibc.h> 038 #include <sos/assert.h> 034 #include <sos/assert.h> 039 #include <drivers/x86_videomem.h> 035 #include <drivers/x86_videomem.h> 040 #include <drivers/bochs.h> 036 #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> << 045 037 046 038 047 /* Helper function to display each bits of a 3 039 /* Helper function to display each bits of a 32bits integer on the 048 screen as dark or light carrets */ 040 screen as dark or light carrets */ 049 void display_bits(unsigned char row, unsigned 041 void display_bits(unsigned char row, unsigned char col, 050 unsigned char attribute, 042 unsigned char attribute, 051 sos_ui32_t integer) 043 sos_ui32_t integer) 052 { 044 { 053 int i; 045 int i; 054 /* Scan each bit of the integer, MSb first * 046 /* Scan each bit of the integer, MSb first */ 055 for (i = 31 ; i >= 0 ; i--) 047 for (i = 31 ; i >= 0 ; i--) 056 { 048 { 057 /* Test if bit i of 'integer' is set */ 049 /* Test if bit i of 'integer' is set */ 058 int bit_i = (integer & (1 << i)); 050 int bit_i = (integer & (1 << i)); 059 /* Ascii 219 => dark carret, Ascii 177 = 051 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 060 unsigned char ascii_code = bit_i?219:177 052 unsigned char ascii_code = bit_i?219:177; 061 sos_x86_videomem_putchar(row, col++, 053 sos_x86_videomem_putchar(row, col++, 062 attribute, 054 attribute, 063 ascii_code); 055 ascii_code); 064 } 056 } 065 } 057 } 066 058 067 059 068 /* Clock IRQ handler */ 060 /* Clock IRQ handler */ 069 static void clk_it(int intid) 061 static void clk_it(int intid) 070 { 062 { 071 static sos_ui32_t clock_count = 0; 063 static sos_ui32_t clock_count = 0; 072 064 073 display_bits(0, 48, 065 display_bits(0, 48, 074 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 066 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 075 clock_count); 067 clock_count); 076 clock_count++; 068 clock_count++; 077 069 078 /* Execute the expired timeout actions (if a 070 /* Execute the expired timeout actions (if any) */ 079 sos_time_do_tick(); 071 sos_time_do_tick(); 080 << 081 /* Update scheduler statistics and status */ << 082 sos_sched_do_timer_tick(); << 083 } 072 } 084 073 085 074 086 /* =========================================== 075 /* ====================================================================== 087 * Page fault exception handling 076 * Page fault exception handling 088 */ 077 */ 089 078 >> 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 } >> 135 090 136 091 /* Page fault exception handler with demand pa 137 /* Page fault exception handler with demand paging for the kernel */ 092 static void pgflt_ex(int intid, struct sos_cpu !! 138 static void pgflt_ex(int intid, const struct sos_cpu_state *ctxt) 093 { 139 { 094 static sos_ui32_t demand_paging_count = 0; 140 static sos_ui32_t demand_paging_count = 0; 095 struct sos_thread * cur_thr = sos_thread_get !! 141 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 096 sos_vaddr_t faulting_vaddr = sos_cpu_contex << 097 sos_paddr_t ppage_paddr; 142 sos_paddr_t ppage_paddr; 098 143 099 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 << 105 << 106 /* Make sure to always stay in the inter << 107 configuration */ << 108 need_to_setup_mmu = (cur_thr->squatted_m << 109 != sos_process_get_ << 110 if (need_to_setup_mmu) << 111 sos_thread_prepare_user_space_access(N << 112 << 113 if (SOS_OK == << 114 sos_umem_vmm_try_resolve_page_fault( << 115 << 116 << 117 goto unforce_address_space; << 118 << 119 /* If the page fault occured in kernel m << 120 the fixup address */ << 121 if (! sos_cpu_context_is_in_user_mode(ct << 122 { << 123 cur_thr->fixup_uaccess.faulted_uaddr << 124 sos_cpu_context_set_EX_return_addres << 125 << 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 F << 133 sos_cpu_context_get_PC( << 134 (unsigned)faulting_vadd << 135 (unsigned)sos_cpu_conte << 136 sos_bochs_printf("Terminating User threa << 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 << 145 /* Check if address is covered by any VMM ra 144 /* Check if address is covered by any VMM range */ 146 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 145 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 147 { 146 { 148 /* No: The page fault is out of any kern 147 /* No: The page fault is out of any kernel virtual region. For 149 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); 150 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)!", 151 sos_cpu_context_ 154 sos_cpu_context_get_PC(ctxt), 152 (unsigned)faulti 155 (unsigned)faulting_vaddr, 153 (unsigned)sos_cp 156 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 154 SOS_ASSERT_FATAL(! "Got page fault (note 157 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 155 } 158 } 156 159 157 160 158 /* 161 /* 159 * Demand paging in kernel space !! 162 * Demand paging 160 */ 163 */ 161 164 162 /* Update the number of demand paging reques 165 /* Update the number of demand paging requests handled */ 163 demand_paging_count ++; 166 demand_paging_count ++; 164 display_bits(0, 0, 167 display_bits(0, 0, 165 SOS_X86_VIDEO_FG_LTRED | SOS_X8 168 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 166 demand_paging_count); 169 demand_paging_count); 167 170 168 /* Allocate a new page for the virtual addre 171 /* Allocate a new page for the virtual address */ 169 ppage_paddr = sos_physmem_ref_physpage_new(F 172 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 170 if (! ppage_paddr) 173 if (! ppage_paddr) 171 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 !)"); 172 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 175 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 173 SO 176 SOS_PAGE_ALIGN_INF(faulting_vaddr), 174 FA 177 FALSE, 175 SO 178 SOS_VM_MAP_PROT_READ 176 | 179 | SOS_VM_MAP_PROT_WRITE 177 | 180 | SOS_VM_MAP_ATOMIC)); 178 sos_physmem_unref_physpage(ppage_paddr); 181 sos_physmem_unref_physpage(ppage_paddr); 179 182 180 /* Ok, we can now return to interrupted cont 183 /* Ok, we can now return to interrupted context */ 181 } 184 } 182 185 183 186 >> 187 /* ====================================================================== >> 188 * Demonstrate the use of SOS kernel threads >> 189 * - Kernel Threads are created with various priorities and their >> 190 * state is printed on both the console and the bochs' 0xe9 port >> 191 * - For tests regarding threads' synchronization, see mouse_sim.c >> 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*)arg; >> 207 int progress = 0; >> 208 >> 209 sos_bochs_printf("start %c", thr_arg->character); >> 210 while (1) >> 211 { >> 212 progress ++; >> 213 display_bits(thr_arg->row, thr_arg->col+1, thr_arg->color, progress); >> 214 >> 215 sos_bochs_putchar(thr_arg->character); >> 216 >> 217 /* Yield the CPU to another thread sometimes... */ >> 218 if ((random() % 100) == 0) >> 219 { >> 220 sos_bochs_printf("[37myield(%c)[m\n", thr_arg->character); >> 221 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'Y'); >> 222 SOS_ASSERT_FATAL(SOS_OK == sos_thread_yield()); >> 223 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); >> 224 } >> 225 >> 226 /* Go to sleep some other times... */ >> 227 else if ((random() % 200) == 0) >> 228 { >> 229 struct sos_time t = (struct sos_time){ .sec=0, .nanosec=50000000 }; >> 230 sos_bochs_printf("[37msleep1(%c)[m\n", thr_arg->character); >> 231 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 's'); >> 232 SOS_ASSERT_FATAL(SOS_OK == sos_thread_sleep(& t)); >> 233 SOS_ASSERT_FATAL(sos_time_is_zero(& t)); >> 234 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); >> 235 } >> 236 >> 237 /* Go to sleep for a longer time some other times... */ >> 238 else if ((random() % 300) == 0) >> 239 { >> 240 struct sos_time t = (struct sos_time){ .sec=0, .nanosec=300000000 }; >> 241 sos_bochs_printf("[37msleep2(%c)[m\n", thr_arg->character); >> 242 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'S'); >> 243 SOS_ASSERT_FATAL(SOS_OK == sos_thread_sleep(& t)); >> 244 SOS_ASSERT_FATAL(sos_time_is_zero(& t)); >> 245 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); >> 246 } >> 247 >> 248 /* Infinite loop otherwise */ >> 249 } >> 250 } >> 251 >> 252 >> 253 static void test_thread() >> 254 { >> 255 /* "static" variables because we want them to remain even when the >> 256 function returns */ >> 257 static struct thr_arg arg_b, arg_c, arg_d, arg_e, arg_R, arg_S; >> 258 sos_ui32_t flags; >> 259 >> 260 sos_disable_IRQs(flags); >> 261 >> 262 arg_b = (struct thr_arg) { .character='b', .col=0, .row=21, .color=0x14 }; >> 263 sos_create_kernel_thread("YO[b]", demo_thread, (void*)&arg_b); >> 264 >> 265 arg_c = (struct thr_arg) { .character='c', .col=46, .row=21, .color=0x14 }; >> 266 sos_create_kernel_thread("YO[c]", demo_thread, (void*)&arg_c); >> 267 >> 268 arg_d = (struct thr_arg) { .character='d', .col=0, .row=20, .color=0x14 }; >> 269 sos_create_kernel_thread("YO[d]", demo_thread, (void*)&arg_d); >> 270 >> 271 arg_e = (struct thr_arg) { .character='e', .col=0, .row=19, .color=0x14 }; >> 272 sos_create_kernel_thread("YO[e]", demo_thread, (void*)&arg_e); >> 273 >> 274 arg_R = (struct thr_arg) { .character='R', .col=0, .row=17, .color=0x1c }; >> 275 sos_create_kernel_thread("YO[R]", demo_thread, (void*)&arg_R); >> 276 >> 277 arg_S = (struct thr_arg) { .character='S', .col=0, .row=16, .color=0x1c }; >> 278 sos_create_kernel_thread("YO[S]", demo_thread, (void*)&arg_S); >> 279 >> 280 sos_restore_IRQs(flags); >> 281 } >> 282 184 283 185 /* =========================================== 284 /* ====================================================================== 186 * An operating system MUST always have a read 285 * An operating system MUST always have a ready thread ! Otherwise: 187 * what would the CPU have to execute ?! 286 * what would the CPU have to execute ?! 188 */ 287 */ 189 static void idle_thread() 288 static void idle_thread() 190 { 289 { 191 sos_ui32_t idle_twiddle = 0; 290 sos_ui32_t idle_twiddle = 0; 192 291 193 while (1) 292 while (1) 194 { 293 { 195 /* Remove this instruction if you get an 294 /* Remove this instruction if you get an "Invalid opcode" CPU 196 exception (old 80386 CPU) */ 295 exception (old 80386 CPU) */ 197 asm("hlt\n"); 296 asm("hlt\n"); 198 297 199 idle_twiddle ++; 298 idle_twiddle ++; 200 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE 299 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 201 idle_twiddle); 300 idle_twiddle); 202 301 203 /* Lend the CPU to some other thread */ 302 /* Lend the CPU to some other thread */ 204 sos_thread_yield(); 303 sos_thread_yield(); 205 } 304 } 206 } 305 } 207 306 208 307 209 /* =========================================== 308 /* ====================================================================== 210 * Kernel thread showing some CPU usage statis << 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 foll << 228 sos_load_get_sload(&load1, &load5, &load << 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 << 234 "Kernel (- Idle) << 235 str1, str5, str1 << 236 << 237 sos_load_get_uload(&load1, &load5, &load << 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 << 243 "User: %s %s %s << 244 str1, str5, str1 << 245 << 246 sos_load_get_uratio(&load1, &load5, &loa << 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 << 252 "User CPU %%: %s << 253 str1, str5, str1 << 254 << 255 /* The IDLE task is INcluded in the foll << 256 sos_load_get_sratio(&load1, &load5, &loa << 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 << 262 "Kernel CPU %% ( << 263 str1, str5, str1 << 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 << 285 << 286 /* Map the 'init' program in user space */ << 287 start_uaddr = sos_binfmt_elf32_map(as_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_ << 296 retval = sos_dev_zero_map(as_init, &ustack, << 297 SOS_VM_MAP_PROT_RE << 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 + SO << 312 SOS_SCHED_P << 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 /* =========================================== << 326 * The C entry point of our operating system 309 * The C entry point of our operating system 327 */ 310 */ 328 void sos_main(unsigned long magic, unsigned lo 311 void sos_main(unsigned long magic, unsigned long addr) 329 { 312 { 330 unsigned i; 313 unsigned i; 331 sos_paddr_t sos_kernel_core_base_paddr, sos_ 314 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 332 struct sos_time tick_resolution; 315 struct sos_time tick_resolution; 333 316 334 /* Grub sends us a structure, called multibo 317 /* Grub sends us a structure, called multiboot_info_t with a lot of 335 precious informations about the system, s 318 precious informations about the system, see the multiboot 336 documentation for more information. */ 319 documentation for more information. */ 337 multiboot_info_t *mbi; 320 multiboot_info_t *mbi; 338 mbi = (multiboot_info_t *) addr; 321 mbi = (multiboot_info_t *) addr; 339 322 340 /* Setup bochs and console, and clear the co 323 /* Setup bochs and console, and clear the console */ 341 sos_bochs_setup(); 324 sos_bochs_setup(); 342 325 343 sos_x86_videomem_setup(); 326 sos_x86_videomem_setup(); 344 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 327 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 345 328 346 /* Greetings from SOS */ 329 /* Greetings from SOS */ 347 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 330 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 348 /* Loaded with Grub */ 331 /* Loaded with Grub */ 349 sos_x86_videomem_printf(1, 0, 332 sos_x86_videomem_printf(1, 0, 350 SOS_X86_VIDEO_FG_Y 333 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 351 "Welcome From GRUB 334 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 352 "SOS article 7.5", !! 335 "SOS article 6.5", ',', 353 (unsigned)(mbi->me 336 (unsigned)(mbi->mem_upper >> 10) + 1, 354 (unsigned)mbi->mem 337 (unsigned)mbi->mem_upper); 355 else 338 else 356 /* Not loaded with grub */ 339 /* Not loaded with grub */ 357 sos_x86_videomem_printf(1, 0, 340 sos_x86_videomem_printf(1, 0, 358 SOS_X86_VIDEO_FG_Y 341 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 359 "Welcome to SOS ar !! 342 "Welcome to SOS article 6.5"); 360 343 361 sos_bochs_putstring("Message in a bochs: Thi !! 344 sos_bochs_putstring("Message in a bochs: This is SOS article 6.5.\n"); 362 345 363 /* Setup CPU segmentation and IRQ subsystem 346 /* Setup CPU segmentation and IRQ subsystem */ 364 sos_gdt_subsystem_setup(); 347 sos_gdt_subsystem_setup(); 365 sos_idt_subsystem_setup(); 348 sos_idt_subsystem_setup(); 366 349 367 /* Setup SOS IRQs and exceptions subsystem * 350 /* Setup SOS IRQs and exceptions subsystem */ 368 sos_exception_subsystem_setup(); 351 sos_exception_subsystem_setup(); 369 sos_irq_subsystem_setup(); 352 sos_irq_subsystem_setup(); 370 353 371 /* Configure the timer so as to raise the IR 354 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 372 sos_i8254_set_frequency(100); 355 sos_i8254_set_frequency(100); 373 356 374 /* Setup the kernel time subsystem to get pr 357 /* Setup the kernel time subsystem to get prepared to take the timer 375 ticks into account */ 358 ticks into account */ 376 tick_resolution = (struct sos_time) { .sec=0 359 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 377 sos_time_subsysem_setup(& tick_resolution); 360 sos_time_subsysem_setup(& tick_resolution); 378 361 379 /* We need a multiboot-compliant boot loader 362 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 380 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 363 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 381 { 364 { 382 sos_x86_videomem_putstring(20, 0, 365 sos_x86_videomem_putstring(20, 0, 383 SOS_X86_VIDEO 366 SOS_X86_VIDEO_FG_LTRED 384 | SOS_X86_V 367 | SOS_X86_VIDEO_BG_BLUE 385 | SOS_X86_V 368 | SOS_X86_VIDEO_FG_BLINKING, 386 "I'm not load 369 "I'm not loaded with Grub !"); 387 /* STOP ! */ 370 /* STOP ! */ 388 for (;;) 371 for (;;) 389 continue; 372 continue; 390 } 373 } 391 374 392 /* 375 /* 393 * Some interrupt handlers 376 * Some interrupt handlers 394 */ 377 */ 395 378 396 /* Binding some HW interrupts and exceptions 379 /* Binding some HW interrupts and exceptions to software routines */ 397 sos_irq_set_routine(SOS_IRQ_TIMER, 380 sos_irq_set_routine(SOS_IRQ_TIMER, 398 clk_it); 381 clk_it); 399 382 400 /* 383 /* 401 * Setup physical memory management 384 * Setup physical memory management 402 */ 385 */ 403 386 404 /* Multiboot says: "The value returned for u 387 /* Multiboot says: "The value returned for upper memory is maximally 405 the address of the first upper memory hol 388 the address of the first upper memory hole minus 1 megabyte.". It 406 also adds: "It is not guaranteed to be th 389 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 407 sos_physmem_subsystem_setup((mbi->mem_upper< 390 sos_physmem_subsystem_setup((mbi->mem_upper<<10) + (1<<20), 408 & sos_kernel_cor 391 & sos_kernel_core_base_paddr, 409 & sos_kernel_cor 392 & sos_kernel_core_top_paddr); 410 393 411 /* 394 /* 412 * Switch to paged-memory mode 395 * Switch to paged-memory mode 413 */ 396 */ 414 397 415 /* Disabling interrupts should seem more cor 398 /* Disabling interrupts should seem more correct, but it's not really 416 necessary at this stage */ 399 necessary at this stage */ 417 SOS_ASSERT_FATAL(SOS_OK == 400 SOS_ASSERT_FATAL(SOS_OK == 418 sos_paging_subsystem_setup( 401 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 419 402 sos_kernel_core_top_paddr)); 420 403 421 /* Bind the page fault exception */ 404 /* Bind the page fault exception */ 422 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 405 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 423 pgflt_ex); 406 pgflt_ex); 424 407 425 /* 408 /* 426 * Setup kernel virtual memory allocator 409 * Setup kernel virtual memory allocator 427 */ 410 */ 428 411 429 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 412 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 430 sos_kernel_ 413 sos_kernel_core_top_paddr, 431 bootstrap_s 414 bootstrap_stack_bottom, 432 bootstrap_s 415 bootstrap_stack_bottom 433 + bootstrap 416 + bootstrap_stack_size)) 434 sos_bochs_printf("Could not setup the Kern 417 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 435 418 436 if (sos_kmalloc_subsystem_setup()) 419 if (sos_kmalloc_subsystem_setup()) 437 sos_bochs_printf("Could not setup the Kmal 420 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 438 421 439 /* 422 /* 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 << 451 */ << 452 sos_swintr_subsystem_setup(); << 453 << 454 << 455 /* << 456 * Initialize the Kernel thread and schedule 423 * Initialize the Kernel thread and scheduler subsystems 457 */ 424 */ 458 425 459 /* Initialize kernel thread subsystem */ 426 /* Initialize kernel thread subsystem */ 460 sos_thread_subsystem_setup(bootstrap_stack_b 427 sos_thread_subsystem_setup(bootstrap_stack_bottom, 461 bootstrap_stack_s 428 bootstrap_stack_size); 462 429 463 /* Initialize the scheduler */ 430 /* Initialize the scheduler */ 464 sos_sched_subsystem_setup(); 431 sos_sched_subsystem_setup(); 465 432 466 /* Declare the IDLE thread */ 433 /* Declare the IDLE thread */ 467 SOS_ASSERT_FATAL(sos_create_kernel_thread("i !! 434 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL) != NULL); 468 SO << 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("s << 475 NU << 476 SO << 477 << 478 << 479 /* << 480 * Initialise user address space management << 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 << 490 435 491 /* Enabling the HW interrupts here, this wil 436 /* Enabling the HW interrupts here, this will make the timer HW 492 interrupt call the scheduler */ 437 interrupt call the scheduler */ 493 asm volatile ("sti\n"); 438 asm volatile ("sti\n"); 494 439 495 /* Start the 'init' process, which in turns !! 440 496 programs */ !! 441 /* Now run some Kernel threads just for fun ! */ 497 start_init(); !! 442 extern void MouseSim(); >> 443 MouseSim(); >> 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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