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001 /* Copyright (C) 2004 The SOS Team 001 /* Copyright (C) 2004 The SOS Team 002 Copyright (C) 1999 Free Software Foundatio << 003 002 004 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 005 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 006 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 007 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 008 007 009 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU General Public License for more details 011 GNU General Public License for more details. 013 012 014 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 015 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 017 USA. 016 USA. 018 */ 017 */ 019 018 >> 019 #include <sos/errno.h> >> 020 020 /* Include definitions of the multiboot standa 021 /* Include definitions of the multiboot standard */ 021 #include <bootstrap/multiboot.h> 022 #include <bootstrap/multiboot.h> 022 #include <hwcore/idt.h> 023 #include <hwcore/idt.h> 023 #include <hwcore/gdt.h> 024 #include <hwcore/gdt.h> 024 #include <hwcore/irq.h> 025 #include <hwcore/irq.h> 025 #include <hwcore/exception.h> 026 #include <hwcore/exception.h> 026 #include <hwcore/i8254.h> 027 #include <hwcore/i8254.h> 027 #include <sos/list.h> 028 #include <sos/list.h> 028 #include <sos/physmem.h> 029 #include <sos/physmem.h> 029 #include <hwcore/paging.h> 030 #include <hwcore/paging.h> 030 #include <sos/list.h> !! 031 #include <hwcore/mm_context.h> >> 032 #include <hwcore/swintr.h> >> 033 #include <sos/kmem_vmm.h> >> 034 #include <sos/kmalloc.h> >> 035 #include <sos/time.h> >> 036 #include <sos/thread.h> >> 037 #include <sos/process.h> >> 038 #include <sos/umem_vmm.h> 031 #include <sos/klibc.h> 039 #include <sos/klibc.h> 032 #include <sos/assert.h> 040 #include <sos/assert.h> 033 #include <drivers/x86_videomem.h> 041 #include <drivers/x86_videomem.h> 034 #include <drivers/bochs.h> 042 #include <drivers/bochs.h> 035 !! 043 #include <sos/calcload.h> >> 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> 036 049 037 /* Helper function to display each bits of a 3 050 /* Helper function to display each bits of a 32bits integer on the 038 screen as dark or light carrets */ 051 screen as dark or light carrets */ 039 static void display_bits(unsigned char row, un !! 052 void display_bits(unsigned char row, unsigned char col, 040 unsigned char attribu !! 053 unsigned char attribute, 041 sos_ui32_t integer) !! 054 sos_ui32_t integer) 042 { 055 { 043 int i; 056 int i; 044 /* Scan each bit of the integer, MSb first * 057 /* Scan each bit of the integer, MSb first */ 045 for (i = 31 ; i >= 0 ; i--) 058 for (i = 31 ; i >= 0 ; i--) 046 { 059 { 047 /* Test if bit i of 'integer' is set */ 060 /* Test if bit i of 'integer' is set */ 048 int bit_i = (integer & (1 << i)); 061 int bit_i = (integer & (1 << i)); 049 /* Ascii 219 => dark carret, Ascii 177 = 062 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 050 unsigned char ascii_code = bit_i?219:177 063 unsigned char ascii_code = bit_i?219:177; 051 sos_x86_videomem_putchar(row, col++, 064 sos_x86_videomem_putchar(row, col++, 052 attribute, 065 attribute, 053 ascii_code); 066 ascii_code); 054 } 067 } 055 } 068 } 056 069 057 << 058 /* Clock IRQ handler */ 070 /* Clock IRQ handler */ 059 static void clk_it(int intid) 071 static void clk_it(int intid) 060 { 072 { 061 static sos_ui32_t clock_count = 0; 073 static sos_ui32_t clock_count = 0; 062 074 063 display_bits(0, 48, 075 display_bits(0, 48, 064 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 076 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 065 clock_count); 077 clock_count); 066 clock_count++; 078 clock_count++; 067 079 068 } !! 080 /* Execute the expired timeout actions (if any) */ >> 081 sos_time_do_tick(); 069 082 070 /* Page fault exception handler */ !! 083 /* Update scheduler statistics and status */ 071 static void pgflt_ex(int exid) !! 084 sos_sched_do_timer_tick(); 072 { << 073 sos_bochs_printf("Got page fault\n"); << 074 sos_x86_videomem_printf(10, 30, << 075 SOS_X86_VIDEO_FG_LTR << 076 "Got EXPECTED (?) Pa << 077 for (;;) ; << 078 } 085 } 079 086 080 static void test_paging(sos_vaddr_t sos_kernel !! 087 >> 088 /* ====================================================================== >> 089 * Page fault exception handling >> 090 */ >> 091 >> 092 >> 093 /* Page fault exception handler with demand paging for the kernel */ >> 094 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 081 { 095 { 082 /* The (linear) address of the page holding !! 096 static sos_ui32_t demand_paging_count = 0; 083 currently executing */ !! 097 struct sos_thread * cur_thr = sos_thread_get_current(); 084 sos_vaddr_t vpage_code = SOS_PAGE_ALIGN_INF( !! 098 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 085 !! 099 sos_paddr_t ppage_paddr; 086 /* The new physical page that will hold the << 087 sos_paddr_t ppage_new; << 088 << 089 /* Where this page will be mapped temporaril << 090 code into it: right after the kernel code << 091 sos_vaddr_t vpage_tmp = sos_kernel_core_top_ << 092 100 093 unsigned i; !! 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_EX_info(ctxt); >> 107 >> 108 /* Make sure to always stay in the interrupted thread's MMU >> 109 configuration */ >> 110 need_to_setup_mmu = (cur_thr->squatted_mm_context >> 111 != sos_process_get_mm_context(cur_thr->process)); >> 112 if (need_to_setup_mmu) >> 113 sos_thread_prepare_user_space_access(NULL, 0); >> 114 >> 115 if (SOS_OK == >> 116 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, >> 117 errcode & (1 << 1), >> 118 TRUE)) >> 119 goto unforce_address_space; >> 120 >> 121 /* If the page fault occured in kernel mode, return to kernel to >> 122 the fixup address */ >> 123 if (! sos_cpu_context_is_in_user_mode(ctxt)) >> 124 { >> 125 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; >> 126 sos_cpu_context_set_EX_return_address(ctxt, >> 127 cur_thr->fixup_uaccess.return_vaddr); >> 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 Fault at instruction 0x%x on access to address 0x%x (info=%x)!\n", >> 135 sos_cpu_context_get_PC(ctxt), >> 136 (unsigned)faulting_vaddr, >> 137 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 138 sos_bochs_printf("Terminating User thread\n"); >> 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 range */ >> 148 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) >> 149 { >> 150 /* No: The page fault is out of any kernel virtual region. For >> 151 the moment, we don't handle this. */ >> 152 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", >> 153 sos_cpu_context_get_PC(ctxt), >> 154 (unsigned)faulting_vaddr, >> 155 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 156 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); >> 157 } 094 158 095 /* Bind the page fault exception to one of o << 096 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA << 097 pgflt_ex); << 098 159 099 /* 160 /* 100 * Test 1: move the page where we execute th !! 161 * Demand paging in kernel space 101 * physical memory << 102 */ 162 */ 103 sos_x86_videomem_printf(4, 0, !! 163 104 SOS_X86_VIDEO_FG_LTG !! 164 /* Update the number of demand paging requests handled */ 105 "Moving current code !! 165 demand_paging_count ++; >> 166 display_bits(0, 0, >> 167 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, >> 168 demand_paging_count); >> 169 >> 170 /* Allocate a new page for the virtual address */ >> 171 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); >> 172 if (! ppage_paddr) >> 173 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(ppage_paddr, >> 175 SOS_PAGE_ALIGN_INF(faulting_vaddr), >> 176 FALSE, >> 177 SOS_VM_MAP_PROT_READ >> 178 | SOS_VM_MAP_PROT_WRITE >> 179 | SOS_VM_MAP_ATOMIC)); >> 180 sos_physmem_unref_physpage(ppage_paddr); >> 181 >> 182 /* Ok, we can now return to interrupted context */ >> 183 } >> 184 106 185 107 186 108 /* Allocate a new physical page */ !! 187 /* ====================================================================== 109 ppage_new = sos_physmem_ref_physpage_new(FAL !! 188 * An operating system MUST always have a ready thread ! Otherwise: 110 if (! ppage_new) !! 189 * what would the CPU have to execute ?! >> 190 */ >> 191 static void idle_thread() >> 192 { >> 193 sos_ui32_t idle_twiddle = 0; >> 194 >> 195 while (1) 111 { 196 { 112 /* STOP ! No memory left */ !! 197 /* Remove this instruction if you get an "Invalid opcode" CPU 113 sos_x86_videomem_putstring(20, 0, !! 198 exception (old 80386 CPU) */ 114 SOS_X86_VIDEO !! 199 asm("hlt\n"); 115 | SOS_X86_V !! 200 116 "test_paging !! 201 idle_twiddle ++; 117 return; !! 202 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, >> 203 idle_twiddle); >> 204 >> 205 /* Lend the CPU to some other thread */ >> 206 sos_thread_yield(); 118 } 207 } >> 208 } 119 209 120 sos_x86_videomem_printf(5, 0, !! 210 121 SOS_X86_VIDEO_FG_YEL !! 211 /* ====================================================================== 122 "Hello from the addr !! 212 * Kernel thread showing some CPU usage statistics on the console every 1s 123 sos_paging_get_paddr !! 213 */ 124 !! 214 static void stat_thread() 125 sos_x86_videomem_printf(6, 0, !! 215 { 126 SOS_X86_VIDEO_FG_YEL !! 216 while (1) 127 "Transfer vpage 0x%x !! 217 { 128 vpage_code, !! 218 sos_ui32_t flags; 129 sos_paging_get_paddr !! 219 sos_ui32_t load1, load5, load15; 130 ppage_new, !! 220 char str1[11], str5[11], str15[11]; 131 (unsigned)vpage_tmp) !! 221 struct sos_time t; 132 !! 222 t.sec = 1; 133 /* Map the page somewhere (right after the k !! 223 t.nanosec = 0; 134 to copy the code we are currently executi !! 224 135 sos_paging_map(ppage_new, vpage_tmp, !! 225 sos_thread_sleep(& t); 136 FALSE, !! 226 137 SOS_VM_MAP_ATOMIC !! 227 sos_disable_IRQs(flags); 138 | SOS_VM_MAP_PROT_READ !! 228 139 | SOS_VM_MAP_PROT_WRITE); !! 229 /* The IDLE task is EXcluded in the following computation */ 140 !! 230 sos_load_get_sload(&load1, &load5, &load15); 141 /* Ok, the new page is referenced by the map !! 231 sos_load_to_string(str1, load1); 142 reference to it */ !! 232 sos_load_to_string(str5, load5); 143 sos_physmem_unref_physpage(ppage_new); !! 233 sos_load_to_string(str15, load15); 144 !! 234 sos_x86_videomem_printf(16, 34, 145 /* Copy the contents of the current page of !! 235 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 146 mapping */ !! 236 "Kernel (- Idle): %s %s %s ", 147 memcpy((void*)vpage_tmp, !! 237 str1, str5, str15); 148 (void*)vpage_code, !! 238 149 SOS_PAGE_SIZE); !! 239 sos_load_get_uload(&load1, &load5, &load15); 150 !! 240 sos_load_to_string(str1, load1); 151 /* Transfer the mapping of the current page !! 241 sos_load_to_string(str5, load5); 152 sos_paging_map(ppage_new, vpage_code, !! 242 sos_load_to_string(str15, load15); 153 FALSE, !! 243 sos_x86_videomem_printf(17, 34, 154 SOS_VM_MAP_ATOMIC !! 244 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 155 | SOS_VM_MAP_PROT_READ !! 245 "User: %s %s %s ", 156 | SOS_VM_MAP_PROT_WRITE); !! 246 str1, str5, str15); 157 !! 247 158 /* Ok, here we are: we have changed the phys !! 248 sos_load_get_uratio(&load1, &load5, &load15); 159 code we are executing ;). However, this n !! 249 sos_load_to_string(str1, load1); 160 virtual addresses: !! 250 sos_load_to_string(str5, load5); 161 - vpage_tmp !! 251 sos_load_to_string(str15, load15); 162 - vpage_code !! 252 sos_x86_videomem_printf(18, 34, 163 We can safely unmap it from sos_kernel_co << 164 still keeping the vpage_code mapping */ << 165 sos_paging_unmap(vpage_tmp); << 166 << 167 sos_x86_videomem_printf(7, 0, << 168 SOS_X86_VIDEO_FG_YEL << 169 "Hello from the addr << 170 sos_paging_get_paddr << 171 << 172 sos_x86_videomem_printf(9, 0, << 173 SOS_X86_VIDEO_FG_LTG << 174 "Provoking a page fa << 175 << 176 /* << 177 * Test 2: make sure the #PF handler works << 178 */ << 179 << 180 /* Scan part of the kernel up to a page faul << 181 should occur on the first page unmapped a << 182 which is exactly the page we temporarily << 183 (vpage_tmp) above to move the kernel code << 184 for (i = vpage_code ; /* none */ ; i += SOS_ << 185 { << 186 unsigned *pint = (unsigned *)SOS_PAGE_AL << 187 sos_bochs_printf("Test vaddr 0x%x : val= << 188 sos_x86_videomem_printf(10, 0, << 189 SOS_X86_VIDEO_FG 253 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 190 "Test vaddr 0x%x !! 254 "User CPU %%: %s %s %s ", 191 (unsigned)pint); !! 255 str1, str5, str15); 192 sos_bochs_printf("0x%x\n", *pint); !! 256 193 sos_x86_videomem_printf(10, 30, !! 257 /* The IDLE task is INcluded in the following computation */ >> 258 sos_load_get_sratio(&load1, &load5, &load15); >> 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, 194 SOS_X86_VIDEO_FG 263 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 195 "0x%x " !! 264 "Kernel CPU %% (+ Idle): %s %s %s ", >> 265 str1, str5, str15); >> 266 sos_restore_IRQs(flags); 196 } 267 } >> 268 } >> 269 197 270 198 /* BAD ! Did not get the page fault... */ !! 271 /* ====================================================================== 199 sos_x86_videomem_printf(20, 0, !! 272 * Start the "init" (userland) process 200 SOS_X86_VIDEO_FG_LTR !! 273 */ 201 "We should have had !! 274 static sos_ret_t 202 vpage_tmp); !! 275 start_init(struct sos_fs_manager_instance * rootfs) >> 276 { >> 277 sos_ret_t retval; >> 278 struct sos_umem_vmm_as *as_init; >> 279 struct sos_process *proc_init; >> 280 struct sos_thread *new_thr; >> 281 sos_uaddr_t ustack, start_uaddr; >> 282 struct sos_fs_opened_file * init_root, * init_cwd, * unused_of; >> 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_init); >> 289 >> 290 >> 291 /* >> 292 * Setup the root and CWD directories of the process. The root of >> 293 * this process will correspond to the "global" root of the whole >> 294 * system since all the future processes will duplicate it ! >> 295 */ >> 296 retval = sos_fs_new_opened_file(proc_init, rootfs->root, >> 297 SOS_FS_OPEN_READ | SOS_FS_OPEN_WRITE, >> 298 & init_root); >> 299 if (SOS_OK != retval) >> 300 { >> 301 sos_process_unref(proc_init); >> 302 return -SOS_ENOENT; >> 303 } >> 304 >> 305 /* Duplicate the root file to set the current working directory of >> 306 the init process */ >> 307 retval = sos_fs_duplicate_opened_file(init_root, proc_init, >> 308 & init_cwd); >> 309 if (SOS_OK != retval) >> 310 { >> 311 sos_fs_close(init_root); >> 312 sos_process_unref(proc_init); >> 313 return -SOS_ENOENT; >> 314 } >> 315 >> 316 /* Now update the process ! */ >> 317 if ( ( SOS_OK != sos_process_chroot(proc_init, init_root, & unused_of) ) >> 318 || ( SOS_OK != sos_process_chdir(proc_init, init_cwd, & unused_of) ) ) >> 319 { >> 320 sos_fs_close(init_root); >> 321 sos_fs_close(init_cwd); >> 322 sos_process_chroot(proc_init, NULL, & unused_of); >> 323 sos_process_chdir(proc_init, NULL, & unused_of); >> 324 sos_process_unref(proc_init); >> 325 return -SOS_ENOENT; >> 326 } >> 327 >> 328 /* Map the 'init' program in user space */ >> 329 start_uaddr = sos_binfmt_elf32_map(as_init, "init"); >> 330 if (0 == start_uaddr) >> 331 { >> 332 sos_process_unref(proc_init); >> 333 return -SOS_ENOENT; >> 334 } >> 335 >> 336 /* Allocate the user stack */ >> 337 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; >> 338 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, >> 339 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, >> 340 /* PRIVATE */ 0); >> 341 if (SOS_OK != retval) >> 342 { >> 343 sos_process_unref(proc_init); >> 344 return -SOS_ENOMEM; >> 345 } >> 346 >> 347 /* Now create the user thread */ >> 348 new_thr = sos_create_user_thread(NULL, >> 349 proc_init, >> 350 start_uaddr, >> 351 0, 0, >> 352 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, >> 353 SOS_SCHED_PRIO_TS_LOWEST); >> 354 if (! new_thr) >> 355 { >> 356 sos_process_unref(proc_init); >> 357 return -SOS_ENOMEM; >> 358 } >> 359 >> 360 sos_process_unref(proc_init); >> 361 return SOS_OK; 203 } 362 } 204 363 205 /* The C entry point of our operating system * !! 364 206 void sos_main(unsigned long magic, unsigned lo !! 365 /* ====================================================================== >> 366 * The C entry point of our operating system >> 367 */ >> 368 void sos_main(unsigned long magic, unsigned long arg) 207 { 369 { 208 unsigned i; 370 unsigned i; 209 sos_paddr_t sos_kernel_core_base_paddr, sos_ 371 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; >> 372 struct sos_time tick_resolution; >> 373 struct sos_fs_manager_instance * rootfs; 210 374 211 /* Grub sends us a structure, called multibo !! 375 /* Size of RAM above 1MB. Might be undefined ! */ 212 precious informations about the system, s !! 376 unsigned long int upper_mem = 0; 213 documentation for more information. */ << 214 multiboot_info_t *mbi; << 215 mbi = (multiboot_info_t *) addr; << 216 377 217 /* Setup bochs and console, and clear the co 378 /* Setup bochs and console, and clear the console */ 218 sos_bochs_setup(); 379 sos_bochs_setup(); 219 380 220 sos_x86_videomem_setup(); 381 sos_x86_videomem_setup(); 221 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 382 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 222 383 223 /* Greetings from SOS */ 384 /* Greetings from SOS */ 224 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 385 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 225 /* Loaded with Grub */ !! 386 { 226 sos_x86_videomem_printf(1, 0, !! 387 /* Grub sends us a structure, called multiboot_info_t with a lot of 227 SOS_X86_VIDEO_FG_Y !! 388 precious informations about the system, see the multiboot 228 "Welcome From GRUB !! 389 documentation for more information. */ 229 "SOS", ',', !! 390 multiboot_info_t *mbi = (multiboot_info_t *) arg; 230 (unsigned)(mbi->me !! 391 231 (unsigned)mbi->mem !! 392 /* Multiboot says: "The value returned for upper memory is >> 393 maximally the address of the first upper memory hole minus 1 >> 394 megabyte.". It also adds: "It is not guaranteed to be this >> 395 value." aka "YMMV" ;) */ >> 396 upper_mem = mbi->mem_upper; >> 397 sos_x86_videomem_printf(1, 0, >> 398 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 399 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 400 "SOS article 8", ',', >> 401 (unsigned)(upper_mem >> 10) + 1, >> 402 (unsigned)upper_mem); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 410 "Welcome to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 411 "SOS article 8", ',', >> 412 (unsigned)(upper_mem >> 10) + 1, >> 413 (unsigned)upper_mem); >> 414 } 232 else 415 else 233 /* Not loaded with grub */ !! 416 /* Not loaded with grub, not from an enhanced bootsect */ 234 sos_x86_videomem_printf(1, 0, 417 sos_x86_videomem_printf(1, 0, 235 SOS_X86_VIDEO_FG_Y 418 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 236 "Welcome to SOS"); !! 419 "Welcome to SOS article 8"); 237 420 238 sos_bochs_putstring("Message in a bochs\n"); !! 421 sos_bochs_putstring("Message in a bochs: This is SOS article 8.\n"); 239 422 240 /* Setup CPU segmentation and IRQ subsystem 423 /* Setup CPU segmentation and IRQ subsystem */ 241 sos_gdt_setup(); !! 424 sos_gdt_subsystem_setup(); 242 sos_idt_setup(); !! 425 sos_idt_subsystem_setup(); 243 426 244 /* Setup SOS IRQs and exceptions subsystem * 427 /* Setup SOS IRQs and exceptions subsystem */ 245 sos_exceptions_setup(); !! 428 sos_exception_subsystem_setup(); 246 sos_irq_setup(); !! 429 sos_irq_subsystem_setup(); 247 430 248 /* Configure the timer so as to raise the IR 431 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 249 sos_i8254_set_frequency(100); 432 sos_i8254_set_frequency(100); 250 433 >> 434 /* Setup the kernel time subsystem to get prepared to take the timer >> 435 ticks into account */ >> 436 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; >> 437 sos_time_subsysem_setup(& tick_resolution); 251 438 252 /* We need a multiboot-compliant boot loader !! 439 /* We need to know the RAM size */ 253 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) !! 440 if (upper_mem == 0) 254 { 441 { 255 sos_x86_videomem_putstring(20, 0, 442 sos_x86_videomem_putstring(20, 0, 256 SOS_X86_VIDEO 443 SOS_X86_VIDEO_FG_LTRED 257 | SOS_X86_V 444 | SOS_X86_VIDEO_BG_BLUE 258 | SOS_X86_V 445 | SOS_X86_VIDEO_FG_BLINKING, 259 "I'm not load !! 446 "I don't know RAM size ! Load me with Grub..."); 260 /* STOP ! */ 447 /* STOP ! */ 261 for (;;) 448 for (;;) 262 continue; 449 continue; 263 } 450 } 264 451 >> 452 /* >> 453 * Some interrupt handlers >> 454 */ >> 455 265 /* Binding some HW interrupts and exceptions 456 /* Binding some HW interrupts and exceptions to software routines */ 266 sos_irq_set_routine(SOS_IRQ_TIMER, 457 sos_irq_set_routine(SOS_IRQ_TIMER, 267 clk_it); !! 458 clk_it); 268 /* Enabling the HW interrupts here, this wil !! 459 269 interrupt call our clk_it handler */ !! 460 /* 270 asm volatile ("sti\n"); !! 461 * Setup physical memory management 271 /* Multiboot says: "The value returned for u !! 462 */ 272 the address of the first upper memory hol !! 463 273 also adds: "It is not guaranteed to be th !! 464 SOS_ASSERT_FATAL(SOS_OK 274 sos_physmem_setup((mbi->mem_upper<<10) + (1< !! 465 == sos_physmem_subsystem_setup((upper_mem<<10) + (1<<20), 275 & sos_kernel_core_base_pad !! 466 &sos_kernel_core_base_paddr, 276 & sos_kernel_core_top_padd !! 467 &sos_kernel_core_top_paddr)); 277 468 278 /* 469 /* 279 * Switch to paged-memory mode 470 * Switch to paged-memory mode 280 */ 471 */ 281 472 282 /* Disabling interrupts should seem more cor 473 /* Disabling interrupts should seem more correct, but it's not really 283 necessary at this stage */ 474 necessary at this stage */ 284 if (sos_paging_setup(sos_kernel_core_base_pa !! 475 SOS_ASSERT_FATAL(SOS_OK == 285 sos_kernel_core_top_pad !! 476 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 286 sos_bochs_printf("Could not setup paged me !! 477 sos_kernel_core_top_paddr)); 287 sos_x86_videomem_printf(2, 0, !! 478 288 SOS_X86_VIDEO_FG_YEL !! 479 /* Bind the page fault exception */ 289 "Paged-memory mode i !! 480 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 290 !! 481 pgflt_ex); 291 test_paging(sos_kernel_core_top_paddr); !! 482 292 !! 483 /* 293 /* An operatig system never ends */ !! 484 * Setup kernel virtual memory allocator 294 for (;;) !! 485 */ 295 continue; !! 486 >> 487 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, >> 488 sos_kernel_core_top_paddr, >> 489 bootstrap_stack_bottom, >> 490 bootstrap_stack_bottom >> 491 + bootstrap_stack_size)) >> 492 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); >> 493 >> 494 if (sos_kmalloc_subsystem_setup()) >> 495 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); >> 496 >> 497 /* >> 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 interrupt handler >> 509 */ >> 510 sos_swintr_subsystem_setup(); 296 511 297 return; !! 512 >> 513 /* >> 514 * Initialize the Kernel thread and scheduler subsystems >> 515 */ >> 516 >> 517 /* Initialize kernel thread subsystem */ >> 518 sos_thread_subsystem_setup(bootstrap_stack_bottom, >> 519 bootstrap_stack_size); >> 520 >> 521 /* Initialize the scheduler */ >> 522 sos_sched_subsystem_setup(); >> 523 >> 524 /* Declare the IDLE thread */ >> 525 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, >> 526 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 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("stat_thread", stat_thread, >> 533 NULL, >> 534 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 535 >> 536 >> 537 /* >> 538 * Initialise user address space management subsystem >> 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 >> 549 /* Enabling the HW interrupts here, this will make the timer HW >> 550 interrupt call the scheduler */ >> 551 asm volatile ("sti\n"); >> 552 >> 553 >> 554 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_subsystem_setup()); >> 555 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_setup(NULL, >> 556 "virtfs", >> 557 NULL, >> 558 & rootfs)); >> 559 >> 560 >> 561 /* Start the 'init' process, which in turns launches the other >> 562 programs */ >> 563 start_init(rootfs); >> 564 /* >> 565 * We can safely exit from this function now, for there is already >> 566 * an idle Kernel thread ready to make the CPU busy working... >> 567 * >> 568 * However, we must EXPLICITELY call sos_thread_exit() because a >> 569 * simple "return" will return nowhere ! Actually this first thread >> 570 * was initialized by the Grub bootstrap stage, at a time when the >> 571 * word "thread" did not exist. This means that the stack was not >> 572 * setup in order for a return here to call sos_thread_exit() >> 573 * automagically. Hence we must call it manually. This is the ONLY >> 574 * kernel thread where we must do this manually. >> 575 */ >> 576 sos_bochs_printf("Bye from primary thread !\n"); >> 577 sos_thread_exit(); >> 578 SOS_FATAL_ERROR("No trespassing !"); 298 } 579 }
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