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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 definitions of the multiboot standa 020 /* Include definitions of the multiboot standard */ 020 #include <bootstrap/multiboot.h> 021 #include <bootstrap/multiboot.h> 021 #include <hwcore/idt.h> 022 #include <hwcore/idt.h> 022 #include <hwcore/gdt.h> 023 #include <hwcore/gdt.h> 023 #include <hwcore/irq.h> 024 #include <hwcore/irq.h> 024 #include <hwcore/exception.h> 025 #include <hwcore/exception.h> 025 #include <hwcore/i8254.h> 026 #include <hwcore/i8254.h> 026 #include <sos/list.h> 027 #include <sos/list.h> 027 #include <sos/physmem.h> 028 #include <sos/physmem.h> 028 #include <hwcore/paging.h> 029 #include <hwcore/paging.h> 029 #include <hwcore/mm_context.h> !! 030 #include <sos/list.h> 030 #include <hwcore/swintr.h> << 031 #include <sos/kmem_vmm.h> << 032 #include <sos/kmalloc.h> << 033 #include <sos/time.h> << 034 #include <sos/thread.h> << 035 #include <sos/process.h> << 036 #include <sos/umem_vmm.h> << 037 #include <sos/klibc.h> 031 #include <sos/klibc.h> 038 #include <sos/assert.h> 032 #include <sos/assert.h> 039 #include <drivers/x86_videomem.h> 033 #include <drivers/x86_videomem.h> 040 #include <drivers/bochs.h> 034 #include <drivers/bochs.h> 041 #include <sos/calcload.h> << 042 #include <sos/umem_vmm.h> << 043 #include <sos/binfmt_elf32.h> << 044 #include <drivers/zero.h> << 045 035 046 036 047 /* Helper function to display each bits of a 3 037 /* Helper function to display each bits of a 32bits integer on the 048 screen as dark or light carrets */ 038 screen as dark or light carrets */ 049 void display_bits(unsigned char row, unsigned !! 039 static void display_bits(unsigned char row, unsigned char col, 050 unsigned char attribute, !! 040 unsigned char attribute, 051 sos_ui32_t integer) !! 041 sos_ui32_t integer) 052 { 042 { 053 int i; 043 int i; 054 /* Scan each bit of the integer, MSb first * 044 /* Scan each bit of the integer, MSb first */ 055 for (i = 31 ; i >= 0 ; i--) 045 for (i = 31 ; i >= 0 ; i--) 056 { 046 { 057 /* Test if bit i of 'integer' is set */ 047 /* Test if bit i of 'integer' is set */ 058 int bit_i = (integer & (1 << i)); 048 int bit_i = (integer & (1 << i)); 059 /* Ascii 219 => dark carret, Ascii 177 = 049 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 060 unsigned char ascii_code = bit_i?219:177 050 unsigned char ascii_code = bit_i?219:177; 061 sos_x86_videomem_putchar(row, col++, 051 sos_x86_videomem_putchar(row, col++, 062 attribute, 052 attribute, 063 ascii_code); 053 ascii_code); 064 } 054 } 065 } 055 } 066 056 067 057 068 /* Clock IRQ handler */ 058 /* Clock IRQ handler */ 069 static void clk_it(int intid) 059 static void clk_it(int intid) 070 { 060 { 071 static sos_ui32_t clock_count = 0; 061 static sos_ui32_t clock_count = 0; 072 062 073 display_bits(0, 48, 063 display_bits(0, 48, 074 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 064 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 075 clock_count); 065 clock_count); 076 clock_count++; 066 clock_count++; 077 067 078 /* Execute the expired timeout actions (if a << 079 sos_time_do_tick(); << 080 << 081 /* Update scheduler statistics and status */ << 082 sos_sched_do_timer_tick(); << 083 } 068 } 084 069 085 !! 070 /* Page fault exception handler */ 086 /* =========================================== !! 071 static void pgflt_ex(int exid) 087 * Page fault exception handling << 088 */ << 089 << 090 << 091 /* Page fault exception handler with demand pa << 092 static void pgflt_ex(int intid, struct sos_cpu << 093 { 072 { 094 static sos_ui32_t demand_paging_count = 0; !! 073 sos_bochs_printf("Got page fault\n"); 095 struct sos_thread * cur_thr = sos_thread_get !! 074 sos_x86_videomem_printf(10, 30, 096 sos_vaddr_t faulting_vaddr = sos_cpu_contex !! 075 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 097 sos_paddr_t ppage_paddr; !! 076 "Got EXPECTED (?) Page fault ! But where ???"); >> 077 for (;;) ; >> 078 } 098 079 099 if (sos_cpu_context_is_in_user_mode(ctxt) !! 080 static void test_paging(sos_vaddr_t sos_kernel_core_top_vaddr) 100 || (cur_thr->fixup_uaccess.return_vaddr) !! 081 { 101 { !! 082 /* The (linear) address of the page holding the code we are 102 __label__ unforce_address_space; !! 083 currently executing */ 103 sos_bool_t need_to_setup_mmu; !! 084 sos_vaddr_t vpage_code = SOS_PAGE_ALIGN_INF(test_paging); 104 sos_ui32_t errcode = sos_cpu_context_get !! 085 105 !! 086 /* The new physical page that will hold the code */ 106 /* Make sure to always stay in the inter !! 087 sos_paddr_t ppage_new; 107 configuration */ !! 088 108 need_to_setup_mmu = (cur_thr->squatted_m !! 089 /* Where this page will be mapped temporarily in order to copy the 109 != sos_process_get_ !! 090 code into it: right after the kernel code/data */ 110 if (need_to_setup_mmu) !! 091 sos_vaddr_t vpage_tmp = sos_kernel_core_top_vaddr; 111 sos_thread_prepare_user_space_access(N << 112 << 113 if (SOS_OK == << 114 sos_umem_vmm_try_resolve_page_fault( << 115 << 116 << 117 goto unforce_address_space; << 118 << 119 /* If the page fault occured in kernel m << 120 the fixup address */ << 121 if (! sos_cpu_context_is_in_user_mode(ct << 122 { << 123 cur_thr->fixup_uaccess.faulted_uaddr << 124 sos_cpu_context_set_EX_return_addres << 125 << 126 goto unforce_address_space; << 127 } << 128 << 129 if (need_to_setup_mmu) << 130 sos_thread_end_user_space_access(); << 131 << 132 sos_bochs_printf("Unresolved USER page F << 133 sos_cpu_context_get_PC( << 134 (unsigned)faulting_vadd << 135 (unsigned)sos_cpu_conte << 136 sos_bochs_printf("Terminating User threa << 137 sos_thread_exit(); << 138 << 139 unforce_address_space: << 140 if (need_to_setup_mmu) << 141 sos_thread_end_user_space_access(); << 142 return; << 143 } << 144 092 145 /* Check if address is covered by any VMM ra !! 093 unsigned i; 146 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v << 147 { << 148 /* No: The page fault is out of any kern << 149 the moment, we don't handle this. */ << 150 sos_display_fatal_error("Unresolved page << 151 sos_cpu_context_ << 152 (unsigned)faulti << 153 (unsigned)sos_cp << 154 SOS_ASSERT_FATAL(! "Got page fault (note << 155 } << 156 094 >> 095 /* Bind the page fault exception to one of our routines */ >> 096 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, >> 097 pgflt_ex); 157 098 158 /* 099 /* 159 * Demand paging in kernel space !! 100 * Test 1: move the page where we execute the code elsewhere in >> 101 * physical memory 160 */ 102 */ 161 !! 103 sos_x86_videomem_printf(4, 0, 162 /* Update the number of demand paging reques !! 104 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 163 demand_paging_count ++; !! 105 "Moving current code elsewhere in physical memory:"); 164 display_bits(0, 0, << 165 SOS_X86_VIDEO_FG_LTRED | SOS_X8 << 166 demand_paging_count); << 167 << 168 /* Allocate a new page for the virtual addre << 169 ppage_paddr = sos_physmem_ref_physpage_new(F << 170 if (! ppage_paddr) << 171 SOS_ASSERT_FATAL(! "TODO: implement swap. << 172 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp << 173 SO << 174 FA << 175 SO << 176 | << 177 | << 178 sos_physmem_unref_physpage(ppage_paddr); << 179 << 180 /* Ok, we can now return to interrupted cont << 181 } << 182 << 183 106 184 107 185 /* =========================================== !! 108 /* Allocate a new physical page */ 186 * An operating system MUST always have a read !! 109 ppage_new = sos_physmem_ref_physpage_new(FALSE); 187 * what would the CPU have to execute ?! !! 110 if (! ppage_new) 188 */ << 189 static void idle_thread() << 190 { << 191 sos_ui32_t idle_twiddle = 0; << 192 << 193 while (1) << 194 { 111 { 195 /* Remove this instruction if you get an !! 112 /* STOP ! No memory left */ 196 exception (old 80386 CPU) */ !! 113 sos_x86_videomem_putstring(20, 0, 197 asm("hlt\n"); !! 114 SOS_X86_VIDEO_FG_LTRED 198 !! 115 | SOS_X86_VIDEO_BG_BLUE, 199 idle_twiddle ++; !! 116 "test_paging : Cannot allocate page"); 200 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE !! 117 return; 201 idle_twiddle); << 202 << 203 /* Lend the CPU to some other thread */ << 204 sos_thread_yield(); << 205 } 118 } 206 } << 207 << 208 119 209 /* =========================================== !! 120 sos_x86_videomem_printf(5, 0, 210 * Kernel thread showing some CPU usage statis !! 121 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 211 */ !! 122 "Hello from the address 0x%x in physical memory", 212 static void stat_thread() !! 123 sos_paging_get_paddr(vpage_code)); 213 { !! 124 214 while (1) !! 125 sos_x86_videomem_printf(6, 0, >> 126 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 127 "Transfer vpage 0x%x: ppage 0x%x -> 0x%x (tmp vpage 0x%x)", >> 128 vpage_code, >> 129 sos_paging_get_paddr(vpage_code), >> 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) 215 { 185 { 216 sos_ui32_t flags; !! 186 unsigned *pint = (unsigned *)SOS_PAGE_ALIGN_INF(i); 217 sos_ui32_t load1, load5, load15; !! 187 sos_bochs_printf("Test vaddr 0x%x : val=", (unsigned)pint); 218 char str1[11], str5[11], str15[11]; !! 188 sos_x86_videomem_printf(10, 0, 219 struct sos_time t; << 220 t.sec = 1; << 221 t.nanosec = 0; << 222 << 223 sos_thread_sleep(& t); << 224 << 225 sos_disable_IRQs(flags); << 226 << 227 /* The IDLE task is EXcluded in the foll << 228 sos_load_get_sload(&load1, &load5, &load << 229 sos_load_to_string(str1, load1); << 230 sos_load_to_string(str5, load5); << 231 sos_load_to_string(str15, load15); << 232 sos_x86_videomem_printf(16, 34, << 233 SOS_X86_VIDEO_FG 189 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 234 "Kernel (- Idle) !! 190 "Test vaddr 0x%x : val= ", 235 str1, str5, str1 !! 191 (unsigned)pint); 236 !! 192 sos_bochs_printf("0x%x\n", *pint); 237 sos_load_get_uload(&load1, &load5, &load !! 193 sos_x86_videomem_printf(10, 30, 238 sos_load_to_string(str1, load1); << 239 sos_load_to_string(str5, load5); << 240 sos_load_to_string(str15, load15); << 241 sos_x86_videomem_printf(17, 34, << 242 SOS_X86_VIDEO_FG 194 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 243 "User: %s %s %s !! 195 "0x%x ", *pint); 244 str1, str5, str1 << 245 << 246 sos_load_get_uratio(&load1, &load5, &loa << 247 sos_load_to_string(str1, load1); << 248 sos_load_to_string(str5, load5); << 249 sos_load_to_string(str15, load15); << 250 sos_x86_videomem_printf(18, 34, << 251 SOS_X86_VIDEO_FG << 252 "User CPU %%: %s << 253 str1, str5, str1 << 254 << 255 /* The IDLE task is INcluded in the foll << 256 sos_load_get_sratio(&load1, &load5, &loa << 257 sos_load_to_string(str1, load1); << 258 sos_load_to_string(str5, load5); << 259 sos_load_to_string(str15, load15); << 260 sos_x86_videomem_printf(19, 34, << 261 SOS_X86_VIDEO_FG << 262 "Kernel CPU %% ( << 263 str1, str5, str1 << 264 sos_restore_IRQs(flags); << 265 } << 266 } << 267 << 268 << 269 /* =========================================== << 270 * Start the "init" (userland) process << 271 */ << 272 static sos_ret_t start_init() << 273 { << 274 sos_ret_t retval; << 275 struct sos_umem_vmm_as *as_init; << 276 struct sos_process *proc_init; << 277 struct sos_thread *new_thr; << 278 sos_uaddr_t ustack, start_uaddr; << 279 << 280 /* Create the new process */ << 281 proc_init = sos_process_create("init", FALSE << 282 if (! proc_init) << 283 return -SOS_ENOMEM; << 284 as_init = sos_process_get_address_space(proc << 285 << 286 /* Map the 'init' program in user space */ << 287 start_uaddr = sos_binfmt_elf32_map(as_init, << 288 if (0 == start_uaddr) << 289 { << 290 sos_process_unref(proc_init); << 291 return -SOS_ENOENT; << 292 } << 293 << 294 /* Allocate the user stack */ << 295 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ << 296 retval = sos_dev_zero_map(as_init, &ustack, << 297 SOS_VM_MAP_PROT_RE << 298 /* PRIVATE */ 0); << 299 if (SOS_OK != retval) << 300 { << 301 sos_bochs_printf("ici 2\n"); << 302 sos_process_unref(proc_init); << 303 return -SOS_ENOMEM; << 304 } 196 } 305 197 306 /* Now create the user thread */ !! 198 /* BAD ! Did not get the page fault... */ 307 new_thr = sos_create_user_thread(NULL, !! 199 sos_x86_videomem_printf(20, 0, 308 proc_init, !! 200 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 309 start_uaddr !! 201 "We should have had a #PF at vaddr 0x%x !", 310 0, 0, !! 202 vpage_tmp); 311 ustack + SO << 312 SOS_SCHED_P << 313 if (! new_thr) << 314 { << 315 sos_bochs_printf("ici 3\n"); << 316 sos_process_unref(proc_init); << 317 return -SOS_ENOMEM; << 318 } << 319 << 320 sos_process_unref(proc_init); << 321 return SOS_OK; << 322 } 203 } 323 204 324 !! 205 /* The C entry point of our operating system */ 325 /* =========================================== << 326 * The C entry point of our operating system << 327 */ << 328 void sos_main(unsigned long magic, unsigned lo 206 void sos_main(unsigned long magic, unsigned long addr) 329 { 207 { 330 unsigned i; 208 unsigned i; 331 sos_paddr_t sos_kernel_core_base_paddr, sos_ 209 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 332 struct sos_time tick_resolution; << 333 210 334 /* Grub sends us a structure, called multibo 211 /* Grub sends us a structure, called multiboot_info_t with a lot of 335 precious informations about the system, s 212 precious informations about the system, see the multiboot 336 documentation for more information. */ 213 documentation for more information. */ 337 multiboot_info_t *mbi; 214 multiboot_info_t *mbi; 338 mbi = (multiboot_info_t *) addr; 215 mbi = (multiboot_info_t *) addr; 339 216 340 /* Setup bochs and console, and clear the co 217 /* Setup bochs and console, and clear the console */ 341 sos_bochs_setup(); 218 sos_bochs_setup(); 342 219 343 sos_x86_videomem_setup(); 220 sos_x86_videomem_setup(); 344 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 221 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 345 222 346 /* Greetings from SOS */ 223 /* Greetings from SOS */ 347 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 224 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 348 /* Loaded with Grub */ 225 /* Loaded with Grub */ 349 sos_x86_videomem_printf(1, 0, 226 sos_x86_videomem_printf(1, 0, 350 SOS_X86_VIDEO_FG_Y 227 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 351 "Welcome From GRUB 228 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 352 "SOS article 7.5", !! 229 "SOS", ',', 353 (unsigned)(mbi->me 230 (unsigned)(mbi->mem_upper >> 10) + 1, 354 (unsigned)mbi->mem 231 (unsigned)mbi->mem_upper); 355 else 232 else 356 /* Not loaded with grub */ 233 /* Not loaded with grub */ 357 sos_x86_videomem_printf(1, 0, 234 sos_x86_videomem_printf(1, 0, 358 SOS_X86_VIDEO_FG_Y 235 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 359 "Welcome to SOS ar !! 236 "Welcome to SOS"); 360 237 361 sos_bochs_putstring("Message in a bochs: Thi !! 238 sos_bochs_putstring("Message in a bochs\n"); 362 239 363 /* Setup CPU segmentation and IRQ subsystem 240 /* Setup CPU segmentation and IRQ subsystem */ 364 sos_gdt_subsystem_setup(); !! 241 sos_gdt_setup(); 365 sos_idt_subsystem_setup(); !! 242 sos_idt_setup(); 366 243 367 /* Setup SOS IRQs and exceptions subsystem * 244 /* Setup SOS IRQs and exceptions subsystem */ 368 sos_exception_subsystem_setup(); !! 245 sos_exceptions_setup(); 369 sos_irq_subsystem_setup(); !! 246 sos_irq_setup(); 370 247 371 /* Configure the timer so as to raise the IR 248 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 372 sos_i8254_set_frequency(100); 249 sos_i8254_set_frequency(100); 373 250 374 /* Setup the kernel time subsystem to get pr << 375 ticks into account */ << 376 tick_resolution = (struct sos_time) { .sec=0 << 377 sos_time_subsysem_setup(& tick_resolution); << 378 251 379 /* We need a multiboot-compliant boot loader 252 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 380 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 253 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 381 { 254 { 382 sos_x86_videomem_putstring(20, 0, 255 sos_x86_videomem_putstring(20, 0, 383 SOS_X86_VIDEO 256 SOS_X86_VIDEO_FG_LTRED 384 | SOS_X86_V 257 | SOS_X86_VIDEO_BG_BLUE 385 | SOS_X86_V 258 | SOS_X86_VIDEO_FG_BLINKING, 386 "I'm not load 259 "I'm not loaded with Grub !"); 387 /* STOP ! */ 260 /* STOP ! */ 388 for (;;) 261 for (;;) 389 continue; 262 continue; 390 } 263 } 391 264 392 /* << 393 * Some interrupt handlers << 394 */ << 395 << 396 /* Binding some HW interrupts and exceptions 265 /* Binding some HW interrupts and exceptions to software routines */ 397 sos_irq_set_routine(SOS_IRQ_TIMER, 266 sos_irq_set_routine(SOS_IRQ_TIMER, 398 clk_it); !! 267 clk_it); 399 !! 268 /* Enabling the HW interrupts here, this will make the timer HW 400 /* !! 269 interrupt call our clk_it handler */ 401 * Setup physical memory management !! 270 asm volatile ("sti\n"); 402 */ << 403 << 404 /* Multiboot says: "The value returned for u 271 /* Multiboot says: "The value returned for upper memory is maximally 405 the address of the first upper memory hol 272 the address of the first upper memory hole minus 1 megabyte.". It 406 also adds: "It is not guaranteed to be th 273 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 407 sos_physmem_subsystem_setup((mbi->mem_upper< !! 274 sos_physmem_setup((mbi->mem_upper<<10) + (1<<20), 408 & sos_kernel_cor !! 275 & sos_kernel_core_base_paddr, 409 & sos_kernel_cor !! 276 & sos_kernel_core_top_paddr); 410 277 411 /* 278 /* 412 * Switch to paged-memory mode 279 * Switch to paged-memory mode 413 */ 280 */ 414 281 415 /* Disabling interrupts should seem more cor 282 /* Disabling interrupts should seem more correct, but it's not really 416 necessary at this stage */ 283 necessary at this stage */ 417 SOS_ASSERT_FATAL(SOS_OK == !! 284 if (sos_paging_setup(sos_kernel_core_base_paddr, 418 sos_paging_subsystem_setup( !! 285 sos_kernel_core_top_paddr)) 419 !! 286 sos_bochs_printf("Could not setup paged memory mode\n"); 420 !! 287 sos_x86_videomem_printf(2, 0, 421 /* Bind the page fault exception */ !! 288 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 422 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA !! 289 "Paged-memory mode is activated"); 423 pgflt_ex); !! 290 424 !! 291 test_paging(sos_kernel_core_top_paddr); 425 /* !! 292 426 * Setup kernel virtual memory allocator !! 293 /* An operatig system never ends */ 427 */ !! 294 for (;;) 428 !! 295 continue; 429 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ << 430 sos_kernel_ << 431 bootstrap_s << 432 bootstrap_s << 433 + bootstrap << 434 sos_bochs_printf("Could not setup the Kern << 435 << 436 if (sos_kmalloc_subsystem_setup()) << 437 sos_bochs_printf("Could not setup the Kmal << 438 << 439 /* << 440 * Initialize the MMU context subsystem << 441 */ << 442 sos_mm_context_subsystem_setup(); << 443 << 444 /* << 445 * Initialize the CPU context subsystem << 446 */ << 447 sos_cpu_context_subsystem_setup(); << 448 296 449 /* !! 297 return; 450 * Bind the syscall handler to its software << 451 */ << 452 sos_swintr_subsystem_setup(); << 453 << 454 << 455 /* << 456 * Initialize the Kernel thread and schedule << 457 */ << 458 << 459 /* Initialize kernel thread subsystem */ << 460 sos_thread_subsystem_setup(bootstrap_stack_b << 461 bootstrap_stack_s << 462 << 463 /* Initialize the scheduler */ << 464 sos_sched_subsystem_setup(); << 465 << 466 /* Declare the IDLE thread */ << 467 SOS_ASSERT_FATAL(sos_create_kernel_thread("i << 468 SO << 469 << 470 /* Prepare the stats subsystem */ << 471 sos_load_subsystem_setup(); << 472 << 473 /* Declare a thread that prints some stats * << 474 SOS_ASSERT_FATAL(sos_create_kernel_thread("s << 475 NU << 476 SO << 477 << 478 << 479 /* << 480 * Initialise user address space management << 481 */ << 482 sos_umem_vmm_subsystem_setup(); << 483 sos_dev_zero_subsystem_setup(); << 484 << 485 /* << 486 * Initialize process stuff << 487 */ << 488 sos_process_subsystem_setup(); << 489 << 490 << 491 /* Enabling the HW interrupts here, this wil << 492 interrupt call the scheduler */ << 493 asm volatile ("sti\n"); << 494 << 495 /* Start the 'init' process, which in turns << 496 programs */ << 497 start_init(); << 498 << 499 /* << 500 * We can safely exit from this function now << 501 * an idle Kernel thread ready to make the C << 502 * << 503 * However, we must EXPLICITELY call sos_thr << 504 * simple "return" will return nowhere ! Act << 505 * was initialized by the Grub bootstrap sta << 506 * word "thread" did not exist. This means t << 507 * setup in order for a return here to call << 508 * automagically. Hence we must call it manu << 509 * kernel thread where we must do this manua << 510 */ << 511 sos_bochs_printf("Bye from primary thread !\ << 512 sos_thread_exit(); << 513 SOS_FATAL_ERROR("No trespassing !"); << 514 } 298 }
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