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001 /* Copyright (C) 2004 The SOS Team 001 /* Copyright (C) 2004 The SOS Team >> 002 Copyright (C) 1999 Free Software Foundation, Inc. 002 003 003 This program is free software; you can redi 004 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 005 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 006 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 007 of the License, or (at your option) any later version. 007 008 008 This program is distributed in the hope tha 009 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 010 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 012 GNU General Public License for more details. 012 013 013 You should have received a copy of the GNU 014 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 015 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 016 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 017 USA. 017 */ 018 */ 018 019 019 #include <sos/errno.h> << 020 << 021 /* Include definitions of the multiboot standa 020 /* Include definitions of the multiboot standard */ 022 #include <bootstrap/multiboot.h> 021 #include <bootstrap/multiboot.h> 023 #include <hwcore/idt.h> 022 #include <hwcore/idt.h> 024 #include <hwcore/gdt.h> 023 #include <hwcore/gdt.h> 025 #include <hwcore/irq.h> 024 #include <hwcore/irq.h> 026 #include <hwcore/exception.h> 025 #include <hwcore/exception.h> 027 #include <hwcore/i8254.h> 026 #include <hwcore/i8254.h> 028 #include <sos/list.h> 027 #include <sos/list.h> 029 #include <sos/physmem.h> 028 #include <sos/physmem.h> 030 #include <hwcore/paging.h> 029 #include <hwcore/paging.h> 031 #include <hwcore/mm_context.h> !! 030 #include <sos/list.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> << 039 #include <sos/klibc.h> 031 #include <sos/klibc.h> 040 #include <sos/assert.h> 032 #include <sos/assert.h> 041 #include <drivers/x86_videomem.h> 033 #include <drivers/x86_videomem.h> 042 #include <drivers/bochs.h> 034 #include <drivers/bochs.h> 043 #include <sos/calcload.h> !! 035 044 #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> << 049 036 050 /* Helper function to display each bits of a 3 037 /* Helper function to display each bits of a 32bits integer on the 051 screen as dark or light carrets */ 038 screen as dark or light carrets */ 052 void display_bits(unsigned char row, unsigned !! 039 static void display_bits(unsigned char row, unsigned char col, 053 unsigned char attribute, !! 040 unsigned char attribute, 054 sos_ui32_t integer) !! 041 sos_ui32_t integer) 055 { 042 { 056 int i; 043 int i; 057 /* Scan each bit of the integer, MSb first * 044 /* Scan each bit of the integer, MSb first */ 058 for (i = 31 ; i >= 0 ; i--) 045 for (i = 31 ; i >= 0 ; i--) 059 { 046 { 060 /* Test if bit i of 'integer' is set */ 047 /* Test if bit i of 'integer' is set */ 061 int bit_i = (integer & (1 << i)); 048 int bit_i = (integer & (1 << i)); 062 /* Ascii 219 => dark carret, Ascii 177 = 049 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 063 unsigned char ascii_code = bit_i?219:177 050 unsigned char ascii_code = bit_i?219:177; 064 sos_x86_videomem_putchar(row, col++, 051 sos_x86_videomem_putchar(row, col++, 065 attribute, 052 attribute, 066 ascii_code); 053 ascii_code); 067 } 054 } 068 } 055 } 069 056 >> 057 070 /* Clock IRQ handler */ 058 /* Clock IRQ handler */ 071 static void clk_it(int intid) 059 static void clk_it(int intid) 072 { 060 { 073 static sos_ui32_t clock_count = 0; 061 static sos_ui32_t clock_count = 0; 074 062 075 display_bits(0, 48, 063 display_bits(0, 48, 076 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 064 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 077 clock_count); 065 clock_count); 078 clock_count++; 066 clock_count++; 079 067 080 /* Execute the expired timeout actions (if a << 081 sos_time_do_tick(); << 082 << 083 /* Update scheduler statistics and status */ << 084 sos_sched_do_timer_tick(); << 085 } 068 } 086 069 087 !! 070 /* Page fault exception handler */ 088 /* =========================================== !! 071 static void pgflt_ex(int exid) 089 * Page fault exception handling << 090 */ << 091 << 092 << 093 /* Page fault exception handler with demand pa << 094 static void pgflt_ex(int intid, struct sos_cpu << 095 { 072 { 096 static sos_ui32_t demand_paging_count = 0; !! 073 sos_bochs_printf("Got page fault\n"); 097 struct sos_thread * cur_thr = sos_thread_get !! 074 sos_x86_videomem_printf(10, 30, 098 sos_vaddr_t faulting_vaddr = sos_cpu_contex !! 075 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 099 sos_paddr_t ppage_paddr; !! 076 "Got EXPECTED (?) Page fault ! But where ???"); 100 !! 077 for (;;) ; 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 << 148 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v << 149 { << 150 /* No: The page fault is out of any kern << 151 the moment, we don't handle this. */ << 152 sos_display_fatal_error("Unresolved page << 153 sos_cpu_context_ << 154 (unsigned)faulti << 155 (unsigned)sos_cp << 156 SOS_ASSERT_FATAL(! "Got page fault (note << 157 } << 158 << 159 << 160 /* << 161 * Demand paging in kernel space << 162 */ << 163 << 164 /* Update the number of demand paging reques << 165 demand_paging_count ++; << 166 display_bits(0, 0, << 167 SOS_X86_VIDEO_FG_LTRED | SOS_X8 << 168 demand_paging_count); << 169 << 170 /* Allocate a new page for the virtual addre << 171 ppage_paddr = sos_physmem_ref_physpage_new(F << 172 if (! ppage_paddr) << 173 SOS_ASSERT_FATAL(! "TODO: implement swap. << 174 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp << 175 SO << 176 FA << 177 SO << 178 | << 179 | << 180 sos_physmem_unref_physpage(ppage_paddr); << 181 << 182 /* Ok, we can now return to interrupted cont << 183 } 078 } 184 079 185 !! 080 static void test_paging(sos_vaddr_t sos_kernel_core_top_vaddr) 186 << 187 /* =========================================== << 188 * An operating system MUST always have a read << 189 * what would the CPU have to execute ?! << 190 */ << 191 static void idle_thread() << 192 { 081 { 193 sos_ui32_t idle_twiddle = 0; !! 082 /* The (linear) address of the page holding the code we are >> 083 currently executing */ >> 084 sos_vaddr_t vpage_code = SOS_PAGE_ALIGN_INF(test_paging); >> 085 >> 086 /* The new physical page that will hold the code */ >> 087 sos_paddr_t ppage_new; >> 088 >> 089 /* Where this page will be mapped temporarily in order to copy the >> 090 code into it: right after the kernel code/data */ >> 091 sos_vaddr_t vpage_tmp = sos_kernel_core_top_vaddr; 194 092 195 while (1) !! 093 unsigned i; 196 { << 197 /* Remove this instruction if you get an << 198 exception (old 80386 CPU) */ << 199 asm("hlt\n"); << 200 << 201 idle_twiddle ++; << 202 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE << 203 idle_twiddle); << 204 << 205 /* Lend the CPU to some other thread */ << 206 sos_thread_yield(); << 207 } << 208 } << 209 << 210 << 211 /* =========================================== << 212 * Kernel thread showing some CPU usage statis << 213 */ << 214 static void stat_thread() << 215 { << 216 while (1) << 217 { << 218 sos_ui32_t flags; << 219 sos_ui32_t load1, load5, load15; << 220 char str1[11], str5[11], str15[11]; << 221 struct sos_time t; << 222 t.sec = 1; << 223 t.nanosec = 0; << 224 << 225 sos_thread_sleep(& t); << 226 << 227 sos_disable_IRQs(flags); << 228 << 229 /* The IDLE task is EXcluded in the foll << 230 sos_load_get_sload(&load1, &load5, &load << 231 sos_load_to_string(str1, load1); << 232 sos_load_to_string(str5, load5); << 233 sos_load_to_string(str15, load15); << 234 sos_x86_videomem_printf(16, 34, << 235 SOS_X86_VIDEO_FG << 236 "Kernel (- Idle) << 237 str1, str5, str1 << 238 << 239 sos_load_get_uload(&load1, &load5, &load << 240 sos_load_to_string(str1, load1); << 241 sos_load_to_string(str5, load5); << 242 sos_load_to_string(str15, load15); << 243 sos_x86_videomem_printf(17, 34, << 244 SOS_X86_VIDEO_FG << 245 "User: %s %s %s << 246 str1, str5, str1 << 247 << 248 sos_load_get_uratio(&load1, &load5, &loa << 249 sos_load_to_string(str1, load1); << 250 sos_load_to_string(str5, load5); << 251 sos_load_to_string(str15, load15); << 252 sos_x86_videomem_printf(18, 34, << 253 SOS_X86_VIDEO_FG << 254 "User CPU %%: %s << 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 } << 268 } << 269 << 270 << 271 /* =========================================== << 272 * Start the "init" (userland) process << 273 */ << 274 static sos_ret_t << 275 start_init(struct sos_fs_manager_instance * ro << 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, * 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 << 289 094 >> 095 /* Bind the page fault exception to one of our routines */ >> 096 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, >> 097 pgflt_ex); 290 098 291 /* 099 /* 292 * Setup the root and CWD directories of the !! 100 * Test 1: move the page where we execute the code elsewhere in 293 * this process will correspond to the "glob !! 101 * physical memory 294 * system since all the future processes wil << 295 */ 102 */ 296 retval = sos_fs_new_opened_file(proc_init, r !! 103 sos_x86_videomem_printf(4, 0, 297 SOS_FS_OPEN_ !! 104 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 298 & init_root) !! 105 "Moving current code elsewhere in physical memory:"); 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 curren << 306 the init process */ << 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 << 316 /* Now update the process ! */ << 317 if ( ( SOS_OK != sos_process_chroot(proc_ini << 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 } << 327 106 328 /* Map the 'init' program in user space */ << 329 start_uaddr = sos_binfmt_elf32_map(as_init, << 330 if (0 == start_uaddr) << 331 { << 332 sos_process_unref(proc_init); << 333 return -SOS_ENOENT; << 334 } << 335 107 336 /* Allocate the user stack */ !! 108 /* Allocate a new physical page */ 337 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ !! 109 ppage_new = sos_physmem_ref_physpage_new(FALSE); 338 retval = sos_dev_zero_map(as_init, &ustack, !! 110 if (! ppage_new) 339 SOS_VM_MAP_PROT_RE << 340 /* PRIVATE */ 0); << 341 if (SOS_OK != retval) << 342 { 111 { 343 sos_process_unref(proc_init); !! 112 /* STOP ! No memory left */ 344 return -SOS_ENOMEM; !! 113 sos_x86_videomem_putstring(20, 0, >> 114 SOS_X86_VIDEO_FG_LTRED >> 115 | SOS_X86_VIDEO_BG_BLUE, >> 116 "test_paging : Cannot allocate page"); >> 117 return; 345 } 118 } 346 119 347 /* Now create the user thread */ !! 120 sos_x86_videomem_printf(5, 0, 348 new_thr = sos_create_user_thread(NULL, !! 121 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 349 proc_init, !! 122 "Hello from the address 0x%x in physical memory", 350 start_uaddr !! 123 sos_paging_get_paddr(vpage_code)); 351 0, 0, !! 124 352 ustack + SO !! 125 sos_x86_videomem_printf(6, 0, 353 SOS_SCHED_P !! 126 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 354 if (! new_thr) !! 127 "Transfer vpage 0x%x: ppage 0x%x -> 0x%x (tmp vpage 0x%x)", 355 { !! 128 vpage_code, 356 sos_process_unref(proc_init); !! 129 sos_paging_get_paddr(vpage_code), 357 return -SOS_ENOMEM; !! 130 ppage_new, >> 131 (unsigned)vpage_tmp); >> 132 >> 133 /* Map the page somewhere (right after the kernel mapping) in order >> 134 to copy the code we are currently executing */ >> 135 sos_paging_map(ppage_new, vpage_tmp, >> 136 FALSE, >> 137 SOS_VM_MAP_ATOMIC >> 138 | SOS_VM_MAP_PROT_READ >> 139 | SOS_VM_MAP_PROT_WRITE); >> 140 >> 141 /* Ok, the new page is referenced by the mapping, we can release our >> 142 reference to it */ >> 143 sos_physmem_unref_physpage(ppage_new); >> 144 >> 145 /* Copy the contents of the current page of code to this new page >> 146 mapping */ >> 147 memcpy((void*)vpage_tmp, >> 148 (void*)vpage_code, >> 149 SOS_PAGE_SIZE); >> 150 >> 151 /* Transfer the mapping of the current page of code to this new page */ >> 152 sos_paging_map(ppage_new, vpage_code, >> 153 FALSE, >> 154 SOS_VM_MAP_ATOMIC >> 155 | SOS_VM_MAP_PROT_READ >> 156 | SOS_VM_MAP_PROT_WRITE); >> 157 >> 158 /* Ok, here we are: we have changed the physcal page that holds the >> 159 code we are executing ;). However, this new page is mapped at 2 >> 160 virtual addresses: >> 161 - vpage_tmp >> 162 - vpage_code >> 163 We can safely unmap it from sos_kernel_core_top_vaddr, while >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 169 "Hello from the address 0x%x in physical memory", >> 170 sos_paging_get_paddr(vpage_code)); >> 171 >> 172 sos_x86_videomem_printf(9, 0, >> 173 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, >> 174 "Provoking a page fault:"); >> 175 >> 176 /* >> 177 * Test 2: make sure the #PF handler works >> 178 */ >> 179 >> 180 /* Scan part of the kernel up to a page fault. This page fault >> 181 should occur on the first page unmapped after the kernel area, >> 182 which is exactly the page we temporarily mapped/unmapped >> 183 (vpage_tmp) above to move the kernel code we are executing */ >> 184 for (i = vpage_code ; /* none */ ; i += SOS_PAGE_SIZE) >> 185 { >> 186 unsigned *pint = (unsigned *)SOS_PAGE_ALIGN_INF(i); >> 187 sos_bochs_printf("Test vaddr 0x%x : val=", (unsigned)pint); >> 188 sos_x86_videomem_printf(10, 0, >> 189 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 190 "Test vaddr 0x%x : val= ", >> 191 (unsigned)pint); >> 192 sos_bochs_printf("0x%x\n", *pint); >> 193 sos_x86_videomem_printf(10, 30, >> 194 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 195 "0x%x ", *pint); 358 } 196 } 359 197 360 sos_process_unref(proc_init); !! 198 /* BAD ! Did not get the page fault... */ 361 return SOS_OK; !! 199 sos_x86_videomem_printf(20, 0, >> 200 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, >> 201 "We should have had a #PF at vaddr 0x%x !", >> 202 vpage_tmp); 362 } 203 } 363 204 364 !! 205 /* The C entry point of our operating system */ 365 /* =========================================== !! 206 void sos_main(unsigned long magic, unsigned long addr) 366 * The C entry point of our operating system << 367 */ << 368 void sos_main(unsigned long magic, unsigned lo << 369 { 207 { 370 unsigned i; 208 unsigned i; 371 sos_paddr_t sos_kernel_core_base_paddr, sos_ 209 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; << 374 210 375 /* Size of RAM above 1MB. Might be undefined !! 211 /* Grub sends us a structure, called multiboot_info_t with a lot of 376 unsigned long int upper_mem = 0; !! 212 precious informations about the system, see the multiboot >> 213 documentation for more information. */ >> 214 multiboot_info_t *mbi; >> 215 mbi = (multiboot_info_t *) addr; 377 216 378 /* Setup bochs and console, and clear the co 217 /* Setup bochs and console, and clear the console */ 379 sos_bochs_setup(); 218 sos_bochs_setup(); 380 219 381 sos_x86_videomem_setup(); 220 sos_x86_videomem_setup(); 382 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 221 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 383 222 384 /* Greetings from SOS */ 223 /* Greetings from SOS */ 385 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 224 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 386 { !! 225 /* Loaded with Grub */ 387 /* Grub sends us a structure, called mul !! 226 sos_x86_videomem_printf(1, 0, 388 precious informations about the syste !! 227 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 389 documentation for more information. * !! 228 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 390 multiboot_info_t *mbi = (multiboot_info_ !! 229 "SOS", ',', 391 !! 230 (unsigned)(mbi->mem_upper >> 10) + 1, 392 /* Multiboot says: "The value returned f !! 231 (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 232 else 416 /* Not loaded with grub, not from an enhan !! 233 /* Not loaded with grub */ 417 sos_x86_videomem_printf(1, 0, 234 sos_x86_videomem_printf(1, 0, 418 SOS_X86_VIDEO_FG_Y 235 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 419 "Welcome to SOS ar !! 236 "Welcome to SOS"); 420 237 421 sos_bochs_putstring("Message in a bochs: Thi !! 238 sos_bochs_putstring("Message in a bochs\n"); 422 239 423 /* Setup CPU segmentation and IRQ subsystem 240 /* Setup CPU segmentation and IRQ subsystem */ 424 sos_gdt_subsystem_setup(); !! 241 sos_gdt_setup(); 425 sos_idt_subsystem_setup(); !! 242 sos_idt_setup(); 426 243 427 /* Setup SOS IRQs and exceptions subsystem * 244 /* Setup SOS IRQs and exceptions subsystem */ 428 sos_exception_subsystem_setup(); !! 245 sos_exceptions_setup(); 429 sos_irq_subsystem_setup(); !! 246 sos_irq_setup(); 430 247 431 /* Configure the timer so as to raise the IR 248 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 432 sos_i8254_set_frequency(100); 249 sos_i8254_set_frequency(100); 433 250 434 /* Setup the kernel time subsystem to get pr << 435 ticks into account */ << 436 tick_resolution = (struct sos_time) { .sec=0 << 437 sos_time_subsysem_setup(& tick_resolution); << 438 251 439 /* We need to know the RAM size */ !! 252 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 440 if (upper_mem == 0) !! 253 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 441 { 254 { 442 sos_x86_videomem_putstring(20, 0, 255 sos_x86_videomem_putstring(20, 0, 443 SOS_X86_VIDEO 256 SOS_X86_VIDEO_FG_LTRED 444 | SOS_X86_V 257 | SOS_X86_VIDEO_BG_BLUE 445 | SOS_X86_V 258 | SOS_X86_VIDEO_FG_BLINKING, 446 "I don't know !! 259 "I'm not loaded with Grub !"); 447 /* STOP ! */ 260 /* STOP ! */ 448 for (;;) 261 for (;;) 449 continue; 262 continue; 450 } 263 } 451 264 452 /* << 453 * Some interrupt handlers << 454 */ << 455 << 456 /* Binding some HW interrupts and exceptions 265 /* Binding some HW interrupts and exceptions to software routines */ 457 sos_irq_set_routine(SOS_IRQ_TIMER, 266 sos_irq_set_routine(SOS_IRQ_TIMER, 458 clk_it); !! 267 clk_it); 459 !! 268 /* Enabling the HW interrupts here, this will make the timer HW 460 /* !! 269 interrupt call our clk_it handler */ 461 * Setup physical memory management !! 270 asm volatile ("sti\n"); 462 */ !! 271 /* Multiboot says: "The value returned for upper memory is maximally 463 !! 272 the address of the first upper memory hole minus 1 megabyte.". It 464 SOS_ASSERT_FATAL(SOS_OK !! 273 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 465 == sos_physmem_subsystem_se !! 274 sos_physmem_setup((mbi->mem_upper<<10) + (1<<20), 466 !! 275 & sos_kernel_core_base_paddr, 467 !! 276 & sos_kernel_core_top_paddr); 468 277 469 /* 278 /* 470 * Switch to paged-memory mode 279 * Switch to paged-memory mode 471 */ 280 */ 472 281 473 /* Disabling interrupts should seem more cor 282 /* Disabling interrupts should seem more correct, but it's not really 474 necessary at this stage */ 283 necessary at this stage */ 475 SOS_ASSERT_FATAL(SOS_OK == !! 284 if (sos_paging_setup(sos_kernel_core_base_paddr, 476 sos_paging_subsystem_setup( !! 285 sos_kernel_core_top_paddr)) 477 !! 286 sos_bochs_printf("Could not setup paged memory mode\n"); 478 !! 287 sos_x86_videomem_printf(2, 0, 479 /* Bind the page fault exception */ !! 288 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 480 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA !! 289 "Paged-memory mode is activated"); 481 pgflt_ex); !! 290 482 !! 291 test_paging(sos_kernel_core_top_paddr); 483 /* !! 292 484 * Setup kernel virtual memory allocator !! 293 /* An operatig system never ends */ 485 */ !! 294 for (;;) 486 !! 295 continue; 487 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ << 488 sos_kernel_ << 489 bootstrap_s << 490 bootstrap_s << 491 + bootstrap << 492 sos_bochs_printf("Could not setup the Kern << 493 << 494 if (sos_kmalloc_subsystem_setup()) << 495 sos_bochs_printf("Could not setup the Kmal << 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 << 509 */ << 510 sos_swintr_subsystem_setup(); << 511 296 512 !! 297 return; 513 /* << 514 * Initialize the Kernel thread and schedule << 515 */ << 516 << 517 /* Initialize kernel thread subsystem */ << 518 sos_thread_subsystem_setup(bootstrap_stack_b << 519 bootstrap_stack_s << 520 << 521 /* Initialize the scheduler */ << 522 sos_sched_subsystem_setup(); << 523 << 524 /* Declare the IDLE thread */ << 525 SOS_ASSERT_FATAL(sos_create_kernel_thread("i << 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 << 549 /* Enabling the HW interrupts here, this wil << 550 interrupt call the scheduler */ << 551 asm volatile ("sti\n"); << 552 << 553 << 554 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_sub << 555 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_ << 556 << 557 << 558 << 559 << 560 << 561 /* Start the 'init' process, which in turns << 562 programs */ << 563 start_init(rootfs); << 564 /* << 565 * We can safely exit from this function now << 566 * an idle Kernel thread ready to make the C << 567 * << 568 * However, we must EXPLICITELY call sos_thr << 569 * simple "return" will return nowhere ! Act << 570 * was initialized by the Grub bootstrap sta << 571 * word "thread" did not exist. This means t << 572 * setup in order for a return here to call << 573 * automagically. Hence we must call it manu << 574 * kernel thread where we must do this manua << 575 */ << 576 sos_bochs_printf("Bye from primary thread !\ << 577 sos_thread_exit(); << 578 SOS_FATAL_ERROR("No trespassing !"); << 579 } 298 }
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