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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 #include <drivers/devices.h> << 050 #include <drivers/mem.h> << 051 #include <drivers/tty.h> << 052 #include <drivers/console.h> << 053 #include <drivers/serial.h> << 054 036 055 /* Helper function to display each bits of a 3 037 /* Helper function to display each bits of a 32bits integer on the 056 screen as dark or light carrets */ 038 screen as dark or light carrets */ 057 void display_bits(unsigned char row, unsigned !! 039 static void display_bits(unsigned char row, unsigned char col, 058 unsigned char attribute, !! 040 unsigned char attribute, 059 sos_ui32_t integer) !! 041 sos_ui32_t integer) 060 { 042 { 061 int i; 043 int i; 062 /* Scan each bit of the integer, MSb first * 044 /* Scan each bit of the integer, MSb first */ 063 for (i = 31 ; i >= 0 ; i--) 045 for (i = 31 ; i >= 0 ; i--) 064 { 046 { 065 /* Test if bit i of 'integer' is set */ 047 /* Test if bit i of 'integer' is set */ 066 int bit_i = (integer & (1 << i)); 048 int bit_i = (integer & (1 << i)); 067 /* Ascii 219 => dark carret, Ascii 177 = 049 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 068 unsigned char ascii_code = bit_i?219:177 050 unsigned char ascii_code = bit_i?219:177; 069 sos_x86_videomem_putchar(row, col++, 051 sos_x86_videomem_putchar(row, col++, 070 attribute, 052 attribute, 071 ascii_code); 053 ascii_code); 072 } 054 } 073 } 055 } 074 056 >> 057 075 /* Clock IRQ handler */ 058 /* Clock IRQ handler */ 076 static void clk_it(int intid) 059 static void clk_it(int intid) 077 { 060 { 078 static sos_ui32_t clock_count = 0; 061 static sos_ui32_t clock_count = 0; 079 062 080 display_bits(0, 48, 063 display_bits(0, 48, 081 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 064 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 082 clock_count); 065 clock_count); 083 clock_count++; 066 clock_count++; 084 067 085 /* Execute the expired timeout actions (if a << 086 sos_time_do_tick(); << 087 << 088 /* Update scheduler statistics and status */ << 089 sos_sched_do_timer_tick(); << 090 } 068 } 091 069 092 !! 070 /* Page fault exception handler */ 093 /* =========================================== !! 071 static void pgflt_ex(int exid) 094 * Page fault exception handling << 095 */ << 096 << 097 << 098 /* Page fault exception handler with demand pa << 099 static void pgflt_ex(int intid, struct sos_cpu << 100 { 072 { 101 static sos_ui32_t demand_paging_count = 0; !! 073 sos_bochs_printf("Got page fault\n"); 102 struct sos_thread * cur_thr = sos_thread_get !! 074 sos_x86_videomem_printf(10, 30, 103 sos_vaddr_t faulting_vaddr = sos_cpu_contex !! 075 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 104 sos_paddr_t ppage_paddr; !! 076 "Got EXPECTED (?) Page fault ! But where ???"); 105 !! 077 for (;;) ; 106 if (sos_cpu_context_is_in_user_mode(ctxt) << 107 || (cur_thr->fixup_uaccess.return_vaddr) << 108 { << 109 __label__ unforce_address_space; << 110 sos_bool_t need_to_setup_mmu; << 111 sos_ui32_t errcode = sos_cpu_context_get << 112 << 113 /* Make sure to always stay in the inter << 114 configuration */ << 115 need_to_setup_mmu = (cur_thr->squatted_m << 116 != sos_process_get_ << 117 if (need_to_setup_mmu) << 118 sos_thread_prepare_user_space_access(N << 119 << 120 if (SOS_OK == << 121 sos_umem_vmm_try_resolve_page_fault( << 122 << 123 << 124 goto unforce_address_space; << 125 << 126 /* If the page fault occured in kernel m << 127 the fixup address */ << 128 if (! sos_cpu_context_is_in_user_mode(ct << 129 { << 130 cur_thr->fixup_uaccess.faulted_uaddr << 131 sos_cpu_context_set_EX_return_addres << 132 << 133 goto unforce_address_space; << 134 } << 135 << 136 if (need_to_setup_mmu) << 137 sos_thread_end_user_space_access(); << 138 << 139 sos_bochs_printf("Unresolved USER page F << 140 sos_cpu_context_get_PC( << 141 (unsigned)faulting_vadd << 142 (unsigned)sos_cpu_conte << 143 sos_bochs_printf("Terminating User threa << 144 sos_thread_exit(); << 145 << 146 unforce_address_space: << 147 if (need_to_setup_mmu) << 148 sos_thread_end_user_space_access(); << 149 return; << 150 } << 151 << 152 /* Check if address is covered by any VMM ra << 153 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v << 154 { << 155 /* No: The page fault is out of any kern << 156 the moment, we don't handle this. */ << 157 sos_display_fatal_error("Unresolved page << 158 sos_cpu_context_ << 159 (unsigned)faulti << 160 (unsigned)sos_cp << 161 SOS_ASSERT_FATAL(! "Got page fault (note << 162 } << 163 << 164 << 165 /* << 166 * Demand paging in kernel space << 167 */ << 168 << 169 /* Update the number of demand paging reques << 170 demand_paging_count ++; << 171 display_bits(0, 0, << 172 SOS_X86_VIDEO_FG_LTRED | SOS_X8 << 173 demand_paging_count); << 174 << 175 /* Allocate a new page for the virtual addre << 176 ppage_paddr = sos_physmem_ref_physpage_new(F << 177 if (! ppage_paddr) << 178 SOS_ASSERT_FATAL(! "TODO: implement swap. << 179 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp << 180 SO << 181 FA << 182 SO << 183 | << 184 | << 185 sos_physmem_unref_physpage(ppage_paddr); << 186 << 187 /* Ok, we can now return to interrupted cont << 188 } 078 } 189 079 190 !! 080 static void test_paging(sos_vaddr_t sos_kernel_core_top_vaddr) 191 << 192 /* =========================================== << 193 * An operating system MUST always have a read << 194 * what would the CPU have to execute ?! << 195 */ << 196 static void idle_thread() << 197 { 081 { 198 sos_ui32_t idle_twiddle = 0; !! 082 /* The (linear) address of the page holding the code we are 199 !! 083 currently executing */ 200 while (1) !! 084 sos_vaddr_t vpage_code = SOS_PAGE_ALIGN_INF(test_paging); 201 { !! 085 202 /* Remove this instruction if you get an !! 086 /* The new physical page that will hold the code */ 203 exception (old 80386 CPU) */ !! 087 sos_paddr_t ppage_new; 204 asm("hlt\n"); !! 088 205 !! 089 /* Where this page will be mapped temporarily in order to copy the 206 idle_twiddle ++; !! 090 code into it: right after the kernel code/data */ 207 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE !! 091 sos_vaddr_t vpage_tmp = sos_kernel_core_top_vaddr; 208 idle_twiddle); << 209 << 210 /* Lend the CPU to some other thread */ << 211 sos_thread_yield(); << 212 } << 213 } << 214 << 215 << 216 /* =========================================== << 217 * Kernel thread showing some CPU usage statis << 218 */ << 219 #define LOAD_DISPLAY_BASELINE 4 << 220 #define LOAD_DISPLAY_STARTROW 34 << 221 static void stat_thread() << 222 { << 223 while (1) << 224 { << 225 sos_ui32_t flags; << 226 sos_ui32_t load1, load5, load15; << 227 char str1[11], str5[11], str15[11]; << 228 struct sos_time t; << 229 t.sec = 1; << 230 t.nanosec = 0; << 231 << 232 sos_thread_sleep(& t); << 233 << 234 sos_disable_IRQs(flags); << 235 << 236 /* The IDLE task is EXcluded in the foll << 237 sos_load_get_sload(&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(LOAD_DISPLAY_BAS << 242 SOS_X86_VIDEO_FG << 243 "Kernel (- Idle) << 244 str1, str5, str1 << 245 092 246 sos_load_get_uload(&load1, &load5, &load !! 093 unsigned i; 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(LOAD_DISPLAY_BAS << 251 SOS_X86_VIDEO_FG << 252 "User: %s %s %s << 253 str1, str5, str1 << 254 << 255 sos_load_get_uratio(&load1, &load5, &loa << 256 sos_load_to_string(str1, load1); << 257 sos_load_to_string(str5, load5); << 258 sos_load_to_string(str15, load15); << 259 sos_x86_videomem_printf(LOAD_DISPLAY_BAS << 260 SOS_X86_VIDEO_FG << 261 "User CPU %%: %s << 262 str1, str5, str1 << 263 << 264 /* The IDLE task is INcluded in the foll << 265 sos_load_get_sratio(&load1, &load5, &loa << 266 sos_load_to_string(str1, load1); << 267 sos_load_to_string(str5, load5); << 268 sos_load_to_string(str15, load15); << 269 sos_x86_videomem_printf(LOAD_DISPLAY_BAS << 270 SOS_X86_VIDEO_FG << 271 "Kernel CPU %% ( << 272 str1, str5, str1 << 273 sos_restore_IRQs(flags); << 274 } << 275 } << 276 << 277 << 278 /* =========================================== << 279 * Start the "init" (userland) process << 280 */ << 281 static sos_ret_t << 282 start_init(struct sos_fs_manager_instance * ro << 283 { << 284 sos_ret_t retval; << 285 struct sos_umem_vmm_as *as_init; << 286 struct sos_process *proc_init; << 287 struct sos_thread *new_thr; << 288 sos_uaddr_t ustack, start_uaddr; << 289 struct sos_fs_opened_file * init_root, * ini << 290 << 291 /* Create the new process */ << 292 proc_init = sos_process_create("init", FALSE << 293 if (! proc_init) << 294 return -SOS_ENOMEM; << 295 as_init = sos_process_get_address_space(proc << 296 094 >> 095 /* Bind the page fault exception to one of our routines */ >> 096 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, >> 097 pgflt_ex); 297 098 298 /* 099 /* 299 * Setup the root and CWD directories of the !! 100 * Test 1: move the page where we execute the code elsewhere in 300 * this process will correspond to the "glob !! 101 * physical memory 301 * system since all the future processes wil << 302 */ 102 */ 303 retval = sos_fs_new_opened_file(proc_init, r !! 103 sos_x86_videomem_printf(4, 0, 304 SOS_FS_OPEN_ !! 104 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 305 & init_root) !! 105 "Moving current code elsewhere in physical memory:"); 306 if (SOS_OK != retval) << 307 { << 308 sos_process_unref(proc_init); << 309 return -SOS_ENOENT; << 310 } << 311 106 312 /* Duplicate the root file to set the curren << 313 the init process */ << 314 retval = sos_fs_duplicate_opened_file(init_r << 315 & init << 316 if (SOS_OK != retval) << 317 { << 318 sos_fs_close(init_root); << 319 sos_process_unref(proc_init); << 320 return -SOS_ENOENT; << 321 } << 322 << 323 /* Now update the process ! */ << 324 if ( ( SOS_OK != sos_process_chroot(proc_ini << 325 || ( SOS_OK != sos_process_chdir(proc_i << 326 { << 327 sos_fs_close(init_root); << 328 sos_fs_close(init_cwd); << 329 sos_process_chroot(proc_init, NULL, & un << 330 sos_process_chdir(proc_init, NULL, & unu << 331 sos_process_unref(proc_init); << 332 return -SOS_ENOENT; << 333 } << 334 107 335 !! 108 /* Allocate a new physical page */ 336 !! 109 ppage_new = sos_physmem_ref_physpage_new(FALSE); 337 /* Map the 'init' program in user space */ !! 110 if (! ppage_new) 338 start_uaddr = sos_binfmt_elf32_map(as_init, << 339 if (0 == start_uaddr) << 340 { 111 { 341 sos_process_unref(proc_init); !! 112 /* STOP ! No memory left */ 342 return -SOS_ENOENT; !! 113 sos_x86_videomem_putstring(20, 0, 343 } !! 114 SOS_X86_VIDEO_FG_LTRED 344 !! 115 | SOS_X86_VIDEO_BG_BLUE, 345 /* Allocate the user stack */ !! 116 "test_paging : Cannot allocate page"); 346 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ !! 117 return; 347 retval = sos_dev_zero_map(as_init, &ustack, << 348 SOS_VM_MAP_PROT_RE << 349 /* PRIVATE */ 0); << 350 if (SOS_OK != retval) << 351 { << 352 sos_process_unref(proc_init); << 353 return -SOS_ENOMEM; << 354 } 118 } 355 119 356 /* Now create the user thread */ !! 120 sos_x86_videomem_printf(5, 0, 357 new_thr = sos_create_user_thread(NULL, !! 121 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 358 proc_init, !! 122 "Hello from the address 0x%x in physical memory", 359 start_uaddr !! 123 sos_paging_get_paddr(vpage_code)); 360 0, 0, !! 124 361 ustack + SO !! 125 sos_x86_videomem_printf(6, 0, 362 SOS_SCHED_P !! 126 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 363 if (! new_thr) !! 127 "Transfer vpage 0x%x: ppage 0x%x -> 0x%x (tmp vpage 0x%x)", 364 { !! 128 vpage_code, 365 sos_process_unref(proc_init); !! 129 sos_paging_get_paddr(vpage_code), 366 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); 367 } 196 } 368 197 369 sos_process_unref(proc_init); !! 198 /* BAD ! Did not get the page fault... */ 370 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); 371 } 203 } 372 204 373 !! 205 /* The C entry point of our operating system */ 374 /* =========================================== !! 206 void sos_main(unsigned long magic, unsigned long addr) 375 * The C entry point of our operating system << 376 */ << 377 void sos_main(unsigned long magic, unsigned lo << 378 { 207 { 379 unsigned i; 208 unsigned i; 380 sos_paddr_t sos_kernel_core_base_paddr, sos_ 209 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 381 struct sos_time tick_resolution; << 382 struct sos_fs_manager_instance * rootfs; << 383 210 384 /* Size of RAM above 1MB. Might be undefined !! 211 /* Grub sends us a structure, called multiboot_info_t with a lot of 385 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; 386 216 387 /* Setup bochs and console, and clear the co 217 /* Setup bochs and console, and clear the console */ 388 sos_bochs_subsystem_setup(); !! 218 sos_bochs_setup(); 389 219 390 sos_x86_videomem_setup(); 220 sos_x86_videomem_setup(); 391 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 221 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 392 222 393 /* Greetings from SOS */ 223 /* Greetings from SOS */ 394 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 224 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 395 { !! 225 /* Loaded with Grub */ 396 /* Grub sends us a structure, called mul !! 226 sos_x86_videomem_printf(1, 0, 397 precious informations about the syste !! 227 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 398 documentation for more information. * !! 228 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 399 multiboot_info_t *mbi = (multiboot_info_ !! 229 "SOS", ',', 400 !! 230 (unsigned)(mbi->mem_upper >> 10) + 1, 401 /* Multiboot says: "The value returned f !! 231 (unsigned)mbi->mem_upper); 402 maximally the address of the first up << 403 megabyte.". It also adds: "It is not << 404 value." aka "YMMV" ;) */ << 405 upper_mem = mbi->mem_upper; << 406 sos_x86_videomem_printf(1, 0, << 407 SOS_X86_VIDEO_FG << 408 "Welcome From GR << 409 "SOS article 9", << 410 (unsigned)(upper << 411 (unsigned)upper_ << 412 } << 413 else if (magic == 0x42244224) << 414 { << 415 /* Loaded with SOS bootsect */ << 416 upper_mem = arg; << 417 sos_x86_videomem_printf(1, 0, << 418 SOS_X86_VIDEO_FG << 419 "Welcome to %s%c << 420 "SOS article 9", << 421 (unsigned)(upper << 422 (unsigned)upper_ << 423 } << 424 else 232 else 425 /* Not loaded with grub, not from an enhan !! 233 /* Not loaded with grub */ 426 sos_x86_videomem_printf(1, 0, 234 sos_x86_videomem_printf(1, 0, 427 SOS_X86_VIDEO_FG_Y 235 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 428 "Welcome to SOS ar !! 236 "Welcome to SOS"); 429 237 430 sos_bochs_putstring("Message in a bochs: Thi !! 238 sos_bochs_putstring("Message in a bochs\n"); 431 239 432 /* Setup CPU segmentation and IRQ subsystem 240 /* Setup CPU segmentation and IRQ subsystem */ 433 sos_gdt_subsystem_setup(); !! 241 sos_gdt_setup(); 434 sos_idt_subsystem_setup(); !! 242 sos_idt_setup(); 435 243 436 /* Setup SOS IRQs and exceptions subsystem * 244 /* Setup SOS IRQs and exceptions subsystem */ 437 sos_exception_subsystem_setup(); !! 245 sos_exceptions_setup(); 438 sos_irq_subsystem_setup(); !! 246 sos_irq_setup(); 439 247 440 /* Configure the timer so as to raise the IR 248 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 441 sos_i8254_set_frequency(100); 249 sos_i8254_set_frequency(100); 442 250 443 /* Setup the kernel time subsystem to get pr << 444 ticks into account */ << 445 tick_resolution = (struct sos_time) { .sec=0 << 446 sos_time_subsysem_setup(& tick_resolution); << 447 251 448 /* We need to know the RAM size */ !! 252 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 449 if (upper_mem == 0) !! 253 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 450 { 254 { 451 sos_x86_videomem_putstring(20, 0, 255 sos_x86_videomem_putstring(20, 0, 452 SOS_X86_VIDEO 256 SOS_X86_VIDEO_FG_LTRED 453 | SOS_X86_V 257 | SOS_X86_VIDEO_BG_BLUE 454 | SOS_X86_V 258 | SOS_X86_VIDEO_FG_BLINKING, 455 "I don't know !! 259 "I'm not loaded with Grub !"); 456 /* STOP ! */ 260 /* STOP ! */ 457 for (;;) 261 for (;;) 458 continue; 262 continue; 459 } 263 } 460 264 461 /* << 462 * Some interrupt handlers << 463 */ << 464 << 465 /* Binding some HW interrupts and exceptions 265 /* Binding some HW interrupts and exceptions to software routines */ 466 sos_irq_set_routine(SOS_IRQ_TIMER, 266 sos_irq_set_routine(SOS_IRQ_TIMER, 467 clk_it); !! 267 clk_it); 468 !! 268 /* Enabling the HW interrupts here, this will make the timer HW 469 /* !! 269 interrupt call our clk_it handler */ 470 * Setup physical memory management !! 270 asm volatile ("sti\n"); 471 */ !! 271 /* Multiboot says: "The value returned for upper memory is maximally 472 !! 272 the address of the first upper memory hole minus 1 megabyte.". It 473 SOS_ASSERT_FATAL(SOS_OK !! 273 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 474 == sos_physmem_subsystem_se !! 274 sos_physmem_setup((mbi->mem_upper<<10) + (1<<20), 475 !! 275 & sos_kernel_core_base_paddr, 476 !! 276 & sos_kernel_core_top_paddr); 477 277 478 /* 278 /* 479 * Switch to paged-memory mode 279 * Switch to paged-memory mode 480 */ 280 */ 481 281 482 /* Disabling interrupts should seem more cor 282 /* Disabling interrupts should seem more correct, but it's not really 483 necessary at this stage */ 283 necessary at this stage */ 484 SOS_ASSERT_FATAL(SOS_OK == !! 284 if (sos_paging_setup(sos_kernel_core_base_paddr, 485 sos_paging_subsystem_setup( !! 285 sos_kernel_core_top_paddr)) 486 !! 286 sos_bochs_printf("Could not setup paged memory mode\n"); 487 !! 287 sos_x86_videomem_printf(2, 0, 488 /* Bind the page fault exception */ !! 288 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 489 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA !! 289 "Paged-memory mode is activated"); 490 pgflt_ex); !! 290 >> 291 test_paging(sos_kernel_core_top_paddr); >> 292 >> 293 /* An operatig system never ends */ >> 294 for (;;) >> 295 continue; 491 296 492 /* !! 297 return; 493 * Setup kernel virtual memory allocator << 494 */ << 495 << 496 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ << 497 sos_kernel_ << 498 bootstrap_s << 499 bootstrap_s << 500 + bootstrap << 501 sos_bochs_printf("Could not setup the Kern << 502 << 503 if (sos_kmalloc_subsystem_setup()) << 504 sos_bochs_printf("Could not setup the Kmal << 505 << 506 /* << 507 * Initialize the MMU context subsystem << 508 */ << 509 sos_mm_context_subsystem_setup(); << 510 << 511 /* << 512 * Initialize the CPU context subsystem << 513 */ << 514 sos_cpu_context_subsystem_setup(); << 515 << 516 /* << 517 * Bind the syscall handler to its software << 518 */ << 519 sos_swintr_subsystem_setup(); << 520 << 521 << 522 /* << 523 * Initialize the Kernel thread and schedule << 524 */ << 525 << 526 /* Initialize kernel thread subsystem */ << 527 sos_thread_subsystem_setup(bootstrap_stack_b << 528 bootstrap_stack_s << 529 << 530 /* Initialize the scheduler */ << 531 sos_sched_subsystem_setup(); << 532 << 533 /* Declare the IDLE thread */ << 534 SOS_ASSERT_FATAL(sos_create_kernel_thread("i << 535 SO << 536 << 537 /* Prepare the stats subsystem */ << 538 sos_load_subsystem_setup(); << 539 << 540 /* Declare a thread that prints some stats * << 541 SOS_ASSERT_FATAL(sos_create_kernel_thread("s << 542 NU << 543 SO << 544 << 545 << 546 /* << 547 * Initialise user address space management << 548 */ << 549 sos_umem_vmm_subsystem_setup(); << 550 sos_dev_zero_subsystem_setup(); << 551 sos_dev_mem_chardev_setup(); << 552 << 553 /* << 554 * Initialize process stuff << 555 */ << 556 sos_process_subsystem_setup(); << 557 << 558 << 559 /* Enabling the HW interrupts here, this wil << 560 interrupt call the scheduler */ << 561 asm volatile ("sti\n"); << 562 << 563 << 564 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_sub << 565 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_ << 566 << 567 << 568 << 569 << 570 << 571 tty_subsystem_setup(); << 572 sos_ttyS0_subsystem_setup(); << 573 sos_console_subsystem_setup(); << 574 << 575 << 576 << 577 << 578 /* Start the 'init' process, which in turns << 579 programs */ << 580 start_init(rootfs); << 581 /* << 582 * We can safely exit from this function now << 583 * an idle Kernel thread ready to make the C << 584 * << 585 * However, we must EXPLICITELY call sos_thr << 586 * simple "return" will return nowhere ! Act << 587 * was initialized by the Grub bootstrap sta << 588 * word "thread" did not exist. This means t << 589 * setup in order for a return here to call << 590 * automagically. Hence we must call it manu << 591 * kernel thread where we must do this manua << 592 */ << 593 sos_bochs_printf("Bye from primary thread !\ << 594 sos_thread_exit(); << 595 SOS_FATAL_ERROR("No trespassing !"); << 596 } 298 }
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