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001 /* Copyright (C) 2004 The SOS Team 001 /* Copyright (C) 2004 The SOS Team 002 002 003 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 007 007 008 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 011 GNU General Public License for more details. 012 012 013 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 016 USA. 017 */ 017 */ 018 018 019 #include <sos/errno.h> << 020 << 021 /* Include definitions of the multiboot standa 019 /* Include definitions of the multiboot standard */ 022 #include <bootstrap/multiboot.h> 020 #include <bootstrap/multiboot.h> 023 #include <hwcore/idt.h> 021 #include <hwcore/idt.h> 024 #include <hwcore/gdt.h> 022 #include <hwcore/gdt.h> 025 #include <hwcore/irq.h> 023 #include <hwcore/irq.h> 026 #include <hwcore/exception.h> 024 #include <hwcore/exception.h> 027 #include <hwcore/i8254.h> 025 #include <hwcore/i8254.h> 028 #include <sos/list.h> 026 #include <sos/list.h> 029 #include <sos/physmem.h> 027 #include <sos/physmem.h> 030 #include <hwcore/paging.h> 028 #include <hwcore/paging.h> 031 #include <hwcore/mm_context.h> << 032 #include <hwcore/swintr.h> << 033 #include <sos/kmem_vmm.h> 029 #include <sos/kmem_vmm.h> 034 #include <sos/kmalloc.h> 030 #include <sos/kmalloc.h> 035 #include <sos/time.h> 031 #include <sos/time.h> 036 #include <sos/thread.h> 032 #include <sos/thread.h> 037 #include <sos/process.h> << 038 #include <sos/umem_vmm.h> << 039 #include <sos/klibc.h> 033 #include <sos/klibc.h> 040 #include <sos/assert.h> 034 #include <sos/assert.h> 041 #include <drivers/x86_videomem.h> 035 #include <drivers/x86_videomem.h> 042 #include <drivers/bochs.h> 036 #include <drivers/bochs.h> 043 #include <sos/calcload.h> !! 037 044 #include <sos/umem_vmm.h> << 045 #include <sos/binfmt_elf32.h> << 046 #include <drivers/zero.h> << 047 #include <sos/fs.h> << 048 #include <drivers/fs_virtfs.h> << 049 038 050 /* Helper function to display each bits of a 3 039 /* Helper function to display each bits of a 32bits integer on the 051 screen as dark or light carrets */ 040 screen as dark or light carrets */ 052 void display_bits(unsigned char row, unsigned 041 void display_bits(unsigned char row, unsigned char col, 053 unsigned char attribute, 042 unsigned char attribute, 054 sos_ui32_t integer) 043 sos_ui32_t integer) 055 { 044 { 056 int i; 045 int i; 057 /* Scan each bit of the integer, MSb first * 046 /* Scan each bit of the integer, MSb first */ 058 for (i = 31 ; i >= 0 ; i--) 047 for (i = 31 ; i >= 0 ; i--) 059 { 048 { 060 /* Test if bit i of 'integer' is set */ 049 /* Test if bit i of 'integer' is set */ 061 int bit_i = (integer & (1 << i)); 050 int bit_i = (integer & (1 << i)); 062 /* Ascii 219 => dark carret, Ascii 177 = 051 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 063 unsigned char ascii_code = bit_i?219:177 052 unsigned char ascii_code = bit_i?219:177; 064 sos_x86_videomem_putchar(row, col++, 053 sos_x86_videomem_putchar(row, col++, 065 attribute, 054 attribute, 066 ascii_code); 055 ascii_code); 067 } 056 } 068 } 057 } 069 058 >> 059 070 /* Clock IRQ handler */ 060 /* Clock IRQ handler */ 071 static void clk_it(int intid) 061 static void clk_it(int intid) 072 { 062 { 073 static sos_ui32_t clock_count = 0; 063 static sos_ui32_t clock_count = 0; 074 064 075 display_bits(0, 48, 065 display_bits(0, 48, 076 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 066 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 077 clock_count); 067 clock_count); 078 clock_count++; 068 clock_count++; 079 069 080 /* Execute the expired timeout actions (if a 070 /* Execute the expired timeout actions (if any) */ 081 sos_time_do_tick(); 071 sos_time_do_tick(); 082 << 083 /* Update scheduler statistics and status */ << 084 sos_sched_do_timer_tick(); << 085 } 072 } 086 073 087 074 088 /* =========================================== 075 /* ====================================================================== 089 * Page fault exception handling 076 * Page fault exception handling 090 */ 077 */ 091 078 >> 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 } >> 135 092 136 093 /* Page fault exception handler with demand pa 137 /* Page fault exception handler with demand paging for the kernel */ 094 static void pgflt_ex(int intid, struct sos_cpu !! 138 static void pgflt_ex(int intid, const struct sos_cpu_state *ctxt) 095 { 139 { 096 static sos_ui32_t demand_paging_count = 0; 140 static sos_ui32_t demand_paging_count = 0; 097 struct sos_thread * cur_thr = sos_thread_get !! 141 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 098 sos_vaddr_t faulting_vaddr = sos_cpu_contex << 099 sos_paddr_t ppage_paddr; 142 sos_paddr_t ppage_paddr; 100 143 101 if (sos_cpu_context_is_in_user_mode(ctxt) << 102 || (cur_thr->fixup_uaccess.return_vaddr) << 103 { << 104 __label__ unforce_address_space; << 105 sos_bool_t need_to_setup_mmu; << 106 sos_ui32_t errcode = sos_cpu_context_get << 107 << 108 /* Make sure to always stay in the inter << 109 configuration */ << 110 need_to_setup_mmu = (cur_thr->squatted_m << 111 != sos_process_get_ << 112 if (need_to_setup_mmu) << 113 sos_thread_prepare_user_space_access(N << 114 << 115 if (SOS_OK == << 116 sos_umem_vmm_try_resolve_page_fault( << 117 << 118 << 119 goto unforce_address_space; << 120 << 121 /* If the page fault occured in kernel m << 122 the fixup address */ << 123 if (! sos_cpu_context_is_in_user_mode(ct << 124 { << 125 cur_thr->fixup_uaccess.faulted_uaddr << 126 sos_cpu_context_set_EX_return_addres << 127 << 128 goto unforce_address_space; << 129 } << 130 << 131 if (need_to_setup_mmu) << 132 sos_thread_end_user_space_access(); << 133 << 134 sos_bochs_printf("Unresolved USER page F << 135 sos_cpu_context_get_PC( << 136 (unsigned)faulting_vadd << 137 (unsigned)sos_cpu_conte << 138 sos_bochs_printf("Terminating User threa << 139 sos_thread_exit(); << 140 << 141 unforce_address_space: << 142 if (need_to_setup_mmu) << 143 sos_thread_end_user_space_access(); << 144 return; << 145 } << 146 << 147 /* Check if address is covered by any VMM ra 144 /* Check if address is covered by any VMM range */ 148 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 145 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 149 { 146 { 150 /* No: The page fault is out of any kern 147 /* No: The page fault is out of any kernel virtual region. For 151 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); 152 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)!", 153 sos_cpu_context_ 154 sos_cpu_context_get_PC(ctxt), 154 (unsigned)faulti 155 (unsigned)faulting_vaddr, 155 (unsigned)sos_cp 156 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 156 SOS_ASSERT_FATAL(! "Got page fault (note 157 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 157 } 158 } 158 159 159 160 160 /* 161 /* 161 * Demand paging in kernel space !! 162 * Demand paging 162 */ 163 */ 163 164 164 /* Update the number of demand paging reques 165 /* Update the number of demand paging requests handled */ 165 demand_paging_count ++; 166 demand_paging_count ++; 166 display_bits(0, 0, 167 display_bits(0, 0, 167 SOS_X86_VIDEO_FG_LTRED | SOS_X8 168 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 168 demand_paging_count); 169 demand_paging_count); 169 170 170 /* Allocate a new page for the virtual addre 171 /* Allocate a new page for the virtual address */ 171 ppage_paddr = sos_physmem_ref_physpage_new(F 172 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 172 if (! ppage_paddr) 173 if (! ppage_paddr) 173 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 !)"); 174 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 175 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 175 SO 176 SOS_PAGE_ALIGN_INF(faulting_vaddr), 176 FA 177 FALSE, 177 SO 178 SOS_VM_MAP_PROT_READ 178 | 179 | SOS_VM_MAP_PROT_WRITE 179 | 180 | SOS_VM_MAP_ATOMIC)); 180 sos_physmem_unref_physpage(ppage_paddr); 181 sos_physmem_unref_physpage(ppage_paddr); 181 182 182 /* Ok, we can now return to interrupted cont 183 /* Ok, we can now return to interrupted context */ 183 } 184 } 184 185 185 186 186 << 187 /* =========================================== 187 /* ====================================================================== 188 * An operating system MUST always have a read !! 188 * Demonstrate the use of SOS kernel threads 189 * what would the CPU have to execute ?! !! 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 190 */ 192 */ 191 static void idle_thread() << 192 { << 193 sos_ui32_t idle_twiddle = 0; << 194 193 195 while (1) !! 194 struct thr_arg 196 { !! 195 { 197 /* Remove this instruction if you get an !! 196 char character; 198 exception (old 80386 CPU) */ !! 197 int color; 199 asm("hlt\n"); << 200 198 201 idle_twiddle ++; !! 199 int col; 202 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE !! 200 int row; 203 idle_twiddle); !! 201 }; 204 << 205 /* Lend the CPU to some other thread */ << 206 sos_thread_yield(); << 207 } << 208 } << 209 202 210 203 211 /* =========================================== !! 204 static void demo_thread(void *arg) 212 * Kernel thread showing some CPU usage statis << 213 */ << 214 static void stat_thread() << 215 { 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); 216 while (1) 210 while (1) 217 { 211 { 218 sos_ui32_t flags; !! 212 progress ++; 219 sos_ui32_t load1, load5, load15; !! 213 display_bits(thr_arg->row, thr_arg->col+1, thr_arg->color, progress); 220 char str1[11], str5[11], str15[11]; !! 214 221 struct sos_time t; !! 215 sos_bochs_putchar(thr_arg->character); 222 t.sec = 1; !! 216 223 t.nanosec = 0; !! 217 /* Yield the CPU to another thread sometimes... */ 224 !! 218 if ((random() % 100) == 0) 225 sos_thread_sleep(& t); !! 219 { 226 !! 220 sos_bochs_printf("[37myield(%c)[m\n", thr_arg->character); 227 sos_disable_IRQs(flags); !! 221 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'Y'); 228 !! 222 SOS_ASSERT_FATAL(SOS_OK == sos_thread_yield()); 229 /* The IDLE task is EXcluded in the foll !! 223 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); 230 sos_load_get_sload(&load1, &load5, &load !! 224 } 231 sos_load_to_string(str1, load1); !! 225 232 sos_load_to_string(str5, load5); !! 226 /* Go to sleep some other times... */ 233 sos_load_to_string(str15, load15); !! 227 else if ((random() % 200) == 0) 234 sos_x86_videomem_printf(16, 34, !! 228 { 235 SOS_X86_VIDEO_FG !! 229 struct sos_time t = (struct sos_time){ .sec=0, .nanosec=50000000 }; 236 "Kernel (- Idle) !! 230 sos_bochs_printf("[37msleep1(%c)[m\n", thr_arg->character); 237 str1, str5, str1 !! 231 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 's'); 238 !! 232 SOS_ASSERT_FATAL(SOS_OK == sos_thread_sleep(& t)); 239 sos_load_get_uload(&load1, &load5, &load !! 233 SOS_ASSERT_FATAL(sos_time_is_zero(& t)); 240 sos_load_to_string(str1, load1); !! 234 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); 241 sos_load_to_string(str5, load5); !! 235 } 242 sos_load_to_string(str15, load15); !! 236 243 sos_x86_videomem_printf(17, 34, !! 237 /* Go to sleep for a longer time some other times... */ 244 SOS_X86_VIDEO_FG !! 238 else if ((random() % 300) == 0) 245 "User: %s %s %s !! 239 { 246 str1, str5, str1 !! 240 struct sos_time t = (struct sos_time){ .sec=0, .nanosec=300000000 }; 247 !! 241 sos_bochs_printf("[37msleep2(%c)[m\n", thr_arg->character); 248 sos_load_get_uratio(&load1, &load5, &loa !! 242 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'S'); 249 sos_load_to_string(str1, load1); !! 243 SOS_ASSERT_FATAL(SOS_OK == sos_thread_sleep(& t)); 250 sos_load_to_string(str5, load5); !! 244 SOS_ASSERT_FATAL(sos_time_is_zero(& t)); 251 sos_load_to_string(str15, load15); !! 245 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); 252 sos_x86_videomem_printf(18, 34, !! 246 } 253 SOS_X86_VIDEO_FG !! 247 254 "User CPU %%: %s !! 248 /* Infinite loop otherwise */ 255 str1, str5, str1 << 256 << 257 /* The IDLE task is INcluded in the foll << 258 sos_load_get_sratio(&load1, &load5, &loa << 259 sos_load_to_string(str1, load1); << 260 sos_load_to_string(str5, load5); << 261 sos_load_to_string(str15, load15); << 262 sos_x86_videomem_printf(19, 34, << 263 SOS_X86_VIDEO_FG << 264 "Kernel CPU %% ( << 265 str1, str5, str1 << 266 sos_restore_IRQs(flags); << 267 } 249 } 268 } 250 } 269 251 270 252 271 /* =========================================== !! 253 static void test_thread() 272 * Start the "init" (userland) process << 273 */ << 274 static sos_ret_t << 275 start_init(struct sos_fs_manager_instance * ro << 276 { 254 { 277 sos_ret_t retval; !! 255 /* "static" variables because we want them to remain even when the 278 struct sos_umem_vmm_as *as_init; !! 256 function returns */ 279 struct sos_process *proc_init; !! 257 static struct thr_arg arg_b, arg_c, arg_d, arg_e, arg_R, arg_S; 280 struct sos_thread *new_thr; !! 258 sos_ui32_t flags; 281 sos_uaddr_t ustack, start_uaddr; << 282 struct sos_fs_opened_file * init_root, * ini << 283 << 284 /* Create the new process */ << 285 proc_init = sos_process_create("init", FALSE << 286 if (! proc_init) << 287 return -SOS_ENOMEM; << 288 as_init = sos_process_get_address_space(proc << 289 259 >> 260 sos_disable_IRQs(flags); 290 261 291 /* !! 262 arg_b = (struct thr_arg) { .character='b', .col=0, .row=21, .color=0x14 }; 292 * Setup the root and CWD directories of the !! 263 sos_create_kernel_thread("YO[b]", demo_thread, (void*)&arg_b); 293 * this process will correspond to the "glob << 294 * system since all the future processes wil << 295 */ << 296 retval = sos_fs_new_opened_file(proc_init, r << 297 SOS_FS_OPEN_ << 298 & init_root) << 299 if (SOS_OK != retval) << 300 { << 301 sos_process_unref(proc_init); << 302 return -SOS_ENOENT; << 303 } << 304 264 305 /* Duplicate the root file to set the curren !! 265 arg_c = (struct thr_arg) { .character='c', .col=46, .row=21, .color=0x14 }; 306 the init process */ !! 266 sos_create_kernel_thread("YO[c]", demo_thread, (void*)&arg_c); 307 retval = sos_fs_duplicate_opened_file(init_r << 308 & init << 309 if (SOS_OK != retval) << 310 { << 311 sos_fs_close(init_root); << 312 sos_process_unref(proc_init); << 313 return -SOS_ENOENT; << 314 } << 315 267 316 /* Now update the process ! */ !! 268 arg_d = (struct thr_arg) { .character='d', .col=0, .row=20, .color=0x14 }; 317 if ( ( SOS_OK != sos_process_chroot(proc_ini !! 269 sos_create_kernel_thread("YO[d]", demo_thread, (void*)&arg_d); 318 || ( SOS_OK != sos_process_chdir(proc_i << 319 { << 320 sos_fs_close(init_root); << 321 sos_fs_close(init_cwd); << 322 sos_process_chroot(proc_init, NULL, & un << 323 sos_process_chdir(proc_init, NULL, & unu << 324 sos_process_unref(proc_init); << 325 return -SOS_ENOENT; << 326 } << 327 270 328 /* Map the 'init' program in user space */ !! 271 arg_e = (struct thr_arg) { .character='e', .col=0, .row=19, .color=0x14 }; 329 start_uaddr = sos_binfmt_elf32_map(as_init, !! 272 sos_create_kernel_thread("YO[e]", demo_thread, (void*)&arg_e); 330 if (0 == start_uaddr) << 331 { << 332 sos_process_unref(proc_init); << 333 return -SOS_ENOENT; << 334 } << 335 273 336 /* Allocate the user stack */ !! 274 arg_R = (struct thr_arg) { .character='R', .col=0, .row=17, .color=0x1c }; 337 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ !! 275 sos_create_kernel_thread("YO[R]", demo_thread, (void*)&arg_R); 338 retval = sos_dev_zero_map(as_init, &ustack, !! 276 339 SOS_VM_MAP_PROT_RE !! 277 arg_S = (struct thr_arg) { .character='S', .col=0, .row=16, .color=0x1c }; 340 /* PRIVATE */ 0); !! 278 sos_create_kernel_thread("YO[S]", demo_thread, (void*)&arg_S); 341 if (SOS_OK != retval) << 342 { << 343 sos_process_unref(proc_init); << 344 return -SOS_ENOMEM; << 345 } << 346 279 347 /* Now create the user thread */ !! 280 sos_restore_IRQs(flags); 348 new_thr = sos_create_user_thread(NULL, !! 281 } 349 proc_init, !! 282 350 start_uaddr !! 283 351 0, 0, !! 284 /* ====================================================================== 352 ustack + SO !! 285 * An operating system MUST always have a ready thread ! Otherwise: 353 SOS_SCHED_P !! 286 * what would the CPU have to execute ?! 354 if (! new_thr) !! 287 */ >> 288 static void idle_thread() >> 289 { >> 290 sos_ui32_t idle_twiddle = 0; >> 291 >> 292 while (1) 355 { 293 { 356 sos_process_unref(proc_init); !! 294 /* Remove this instruction if you get an "Invalid opcode" CPU 357 return -SOS_ENOMEM; !! 295 exception (old 80386 CPU) */ 358 } !! 296 asm("hlt\n"); 359 297 360 sos_process_unref(proc_init); !! 298 idle_twiddle ++; 361 return SOS_OK; !! 299 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, >> 300 idle_twiddle); >> 301 >> 302 /* Lend the CPU to some other thread */ >> 303 sos_thread_yield(); >> 304 } 362 } 305 } 363 306 364 307 365 /* =========================================== 308 /* ====================================================================== 366 * The C entry point of our operating system 309 * The C entry point of our operating system 367 */ 310 */ 368 void sos_main(unsigned long magic, unsigned lo !! 311 void sos_main(unsigned long magic, unsigned long addr) 369 { 312 { 370 unsigned i; 313 unsigned i; 371 sos_paddr_t sos_kernel_core_base_paddr, sos_ 314 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 372 struct sos_time tick_resolution; 315 struct sos_time tick_resolution; 373 struct sos_fs_manager_instance * rootfs; << 374 316 375 /* Size of RAM above 1MB. Might be undefined !! 317 /* Grub sends us a structure, called multiboot_info_t with a lot of 376 unsigned long int upper_mem = 0; !! 318 precious informations about the system, see the multiboot >> 319 documentation for more information. */ >> 320 multiboot_info_t *mbi; >> 321 mbi = (multiboot_info_t *) addr; 377 322 378 /* Setup bochs and console, and clear the co 323 /* Setup bochs and console, and clear the console */ 379 sos_bochs_setup(); 324 sos_bochs_setup(); 380 325 381 sos_x86_videomem_setup(); 326 sos_x86_videomem_setup(); 382 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 327 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 383 328 384 /* Greetings from SOS */ 329 /* Greetings from SOS */ 385 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 330 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 386 { !! 331 /* Loaded with Grub */ 387 /* Grub sends us a structure, called mul !! 332 sos_x86_videomem_printf(1, 0, 388 precious informations about the syste !! 333 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 389 documentation for more information. * !! 334 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 390 multiboot_info_t *mbi = (multiboot_info_ !! 335 "SOS article 6.5", ',', 391 !! 336 (unsigned)(mbi->mem_upper >> 10) + 1, 392 /* Multiboot says: "The value returned f !! 337 (unsigned)mbi->mem_upper); 393 maximally the address of the first up << 394 megabyte.". It also adds: "It is not << 395 value." aka "YMMV" ;) */ << 396 upper_mem = mbi->mem_upper; << 397 sos_x86_videomem_printf(1, 0, << 398 SOS_X86_VIDEO_FG << 399 "Welcome From GR << 400 "SOS article 8", << 401 (unsigned)(upper << 402 (unsigned)upper_ << 403 } << 404 else if (magic == 0x42244224) << 405 { << 406 /* Loaded with SOS bootsect */ << 407 upper_mem = arg; << 408 sos_x86_videomem_printf(1, 0, << 409 SOS_X86_VIDEO_FG << 410 "Welcome to %s%c << 411 "SOS article 8", << 412 (unsigned)(upper << 413 (unsigned)upper_ << 414 } << 415 else 338 else 416 /* Not loaded with grub, not from an enhan !! 339 /* Not loaded with grub */ 417 sos_x86_videomem_printf(1, 0, 340 sos_x86_videomem_printf(1, 0, 418 SOS_X86_VIDEO_FG_Y 341 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 419 "Welcome to SOS ar !! 342 "Welcome to SOS article 6.5"); 420 343 421 sos_bochs_putstring("Message in a bochs: Thi !! 344 sos_bochs_putstring("Message in a bochs: This is SOS article 6.5.\n"); 422 345 423 /* Setup CPU segmentation and IRQ subsystem 346 /* Setup CPU segmentation and IRQ subsystem */ 424 sos_gdt_subsystem_setup(); 347 sos_gdt_subsystem_setup(); 425 sos_idt_subsystem_setup(); 348 sos_idt_subsystem_setup(); 426 349 427 /* Setup SOS IRQs and exceptions subsystem * 350 /* Setup SOS IRQs and exceptions subsystem */ 428 sos_exception_subsystem_setup(); 351 sos_exception_subsystem_setup(); 429 sos_irq_subsystem_setup(); 352 sos_irq_subsystem_setup(); 430 353 431 /* Configure the timer so as to raise the IR 354 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 432 sos_i8254_set_frequency(100); 355 sos_i8254_set_frequency(100); 433 356 434 /* Setup the kernel time subsystem to get pr 357 /* Setup the kernel time subsystem to get prepared to take the timer 435 ticks into account */ 358 ticks into account */ 436 tick_resolution = (struct sos_time) { .sec=0 359 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 437 sos_time_subsysem_setup(& tick_resolution); 360 sos_time_subsysem_setup(& tick_resolution); 438 361 439 /* We need to know the RAM size */ !! 362 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 440 if (upper_mem == 0) !! 363 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 441 { 364 { 442 sos_x86_videomem_putstring(20, 0, 365 sos_x86_videomem_putstring(20, 0, 443 SOS_X86_VIDEO 366 SOS_X86_VIDEO_FG_LTRED 444 | SOS_X86_V 367 | SOS_X86_VIDEO_BG_BLUE 445 | SOS_X86_V 368 | SOS_X86_VIDEO_FG_BLINKING, 446 "I don't know !! 369 "I'm not loaded with Grub !"); 447 /* STOP ! */ 370 /* STOP ! */ 448 for (;;) 371 for (;;) 449 continue; 372 continue; 450 } 373 } 451 374 452 /* 375 /* 453 * Some interrupt handlers 376 * Some interrupt handlers 454 */ 377 */ 455 378 456 /* Binding some HW interrupts and exceptions 379 /* Binding some HW interrupts and exceptions to software routines */ 457 sos_irq_set_routine(SOS_IRQ_TIMER, 380 sos_irq_set_routine(SOS_IRQ_TIMER, 458 clk_it); 381 clk_it); 459 382 460 /* 383 /* 461 * Setup physical memory management 384 * Setup physical memory management 462 */ 385 */ 463 386 464 SOS_ASSERT_FATAL(SOS_OK !! 387 /* Multiboot says: "The value returned for upper memory is maximally 465 == sos_physmem_subsystem_se !! 388 the address of the first upper memory hole minus 1 megabyte.". It 466 !! 389 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 467 !! 390 sos_physmem_subsystem_setup((mbi->mem_upper<<10) + (1<<20), >> 391 & sos_kernel_core_base_paddr, >> 392 & sos_kernel_core_top_paddr); 468 393 469 /* 394 /* 470 * Switch to paged-memory mode 395 * Switch to paged-memory mode 471 */ 396 */ 472 397 473 /* Disabling interrupts should seem more cor 398 /* Disabling interrupts should seem more correct, but it's not really 474 necessary at this stage */ 399 necessary at this stage */ 475 SOS_ASSERT_FATAL(SOS_OK == 400 SOS_ASSERT_FATAL(SOS_OK == 476 sos_paging_subsystem_setup( 401 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 477 402 sos_kernel_core_top_paddr)); 478 403 479 /* Bind the page fault exception */ 404 /* Bind the page fault exception */ 480 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 405 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 481 pgflt_ex); 406 pgflt_ex); 482 407 483 /* 408 /* 484 * Setup kernel virtual memory allocator 409 * Setup kernel virtual memory allocator 485 */ 410 */ 486 411 487 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 412 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 488 sos_kernel_ 413 sos_kernel_core_top_paddr, 489 bootstrap_s 414 bootstrap_stack_bottom, 490 bootstrap_s 415 bootstrap_stack_bottom 491 + bootstrap 416 + bootstrap_stack_size)) 492 sos_bochs_printf("Could not setup the Kern 417 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 493 418 494 if (sos_kmalloc_subsystem_setup()) 419 if (sos_kmalloc_subsystem_setup()) 495 sos_bochs_printf("Could not setup the Kmal 420 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 496 421 497 /* 422 /* 498 * Initialize the MMU context subsystem << 499 */ << 500 sos_mm_context_subsystem_setup(); << 501 << 502 /* << 503 * Initialize the CPU context subsystem << 504 */ << 505 sos_cpu_context_subsystem_setup(); << 506 << 507 /* << 508 * Bind the syscall handler to its software << 509 */ << 510 sos_swintr_subsystem_setup(); << 511 << 512 << 513 /* << 514 * Initialize the Kernel thread and schedule 423 * Initialize the Kernel thread and scheduler subsystems 515 */ 424 */ 516 425 517 /* Initialize kernel thread subsystem */ 426 /* Initialize kernel thread subsystem */ 518 sos_thread_subsystem_setup(bootstrap_stack_b 427 sos_thread_subsystem_setup(bootstrap_stack_bottom, 519 bootstrap_stack_s 428 bootstrap_stack_size); 520 429 521 /* Initialize the scheduler */ 430 /* Initialize the scheduler */ 522 sos_sched_subsystem_setup(); 431 sos_sched_subsystem_setup(); 523 432 524 /* Declare the IDLE thread */ 433 /* Declare the IDLE thread */ 525 SOS_ASSERT_FATAL(sos_create_kernel_thread("i !! 434 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL) != NULL); 526 SO << 527 << 528 /* Prepare the stats subsystem */ << 529 sos_load_subsystem_setup(); << 530 << 531 /* Declare a thread that prints some stats * << 532 SOS_ASSERT_FATAL(sos_create_kernel_thread("s << 533 NU << 534 SO << 535 << 536 << 537 /* << 538 * Initialise user address space management << 539 */ << 540 sos_umem_vmm_subsystem_setup(); << 541 sos_dev_zero_subsystem_setup(); << 542 << 543 /* << 544 * Initialize process stuff << 545 */ << 546 sos_process_subsystem_setup(); << 547 << 548 435 549 /* Enabling the HW interrupts here, this wil 436 /* Enabling the HW interrupts here, this will make the timer HW 550 interrupt call the scheduler */ 437 interrupt call the scheduler */ 551 asm volatile ("sti\n"); 438 asm volatile ("sti\n"); 552 439 553 440 554 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_sub !! 441 /* Now run some Kernel threads just for fun ! */ 555 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_ !! 442 extern void MouseSim(); 556 !! 443 MouseSim(); 557 !! 444 test_thread(); 558 << 559 << 560 445 561 /* Start the 'init' process, which in turns << 562 programs */ << 563 start_init(rootfs); << 564 /* 446 /* 565 * We can safely exit from this function now 447 * We can safely exit from this function now, for there is already 566 * an idle Kernel thread ready to make the C 448 * an idle Kernel thread ready to make the CPU busy working... 567 * 449 * 568 * However, we must EXPLICITELY call sos_thr 450 * However, we must EXPLICITELY call sos_thread_exit() because a 569 * simple "return" will return nowhere ! Act 451 * simple "return" will return nowhere ! Actually this first thread 570 * was initialized by the Grub bootstrap sta 452 * was initialized by the Grub bootstrap stage, at a time when the 571 * word "thread" did not exist. This means t 453 * word "thread" did not exist. This means that the stack was not 572 * setup in order for a return here to call 454 * setup in order for a return here to call sos_thread_exit() 573 * automagically. Hence we must call it manu 455 * automagically. Hence we must call it manually. This is the ONLY 574 * kernel thread where we must do this manua 456 * kernel thread where we must do this manually. 575 */ 457 */ 576 sos_bochs_printf("Bye from primary thread !\ 458 sos_bochs_printf("Bye from primary thread !\n"); 577 sos_thread_exit(); 459 sos_thread_exit(); 578 SOS_FATAL_ERROR("No trespassing !"); 460 SOS_FATAL_ERROR("No trespassing !"); 579 } 461 }
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