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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/klibc.h> 031 #include <sos/klibc.h> 037 #include <sos/assert.h> 032 #include <sos/assert.h> 038 #include <drivers/x86_videomem.h> 033 #include <drivers/x86_videomem.h> 039 #include <drivers/bochs.h> 034 #include <drivers/bochs.h> 040 #include <sos/calcload.h> << 041 035 042 036 043 /* Helper function to display each bits of a 3 037 /* Helper function to display each bits of a 32bits integer on the 044 screen as dark or light carrets */ 038 screen as dark or light carrets */ 045 void display_bits(unsigned char row, unsigned !! 039 static void display_bits(unsigned char row, unsigned char col, 046 unsigned char attribute, !! 040 unsigned char attribute, 047 sos_ui32_t integer) !! 041 sos_ui32_t integer) 048 { 042 { 049 int i; 043 int i; 050 /* Scan each bit of the integer, MSb first * 044 /* Scan each bit of the integer, MSb first */ 051 for (i = 31 ; i >= 0 ; i--) 045 for (i = 31 ; i >= 0 ; i--) 052 { 046 { 053 /* Test if bit i of 'integer' is set */ 047 /* Test if bit i of 'integer' is set */ 054 int bit_i = (integer & (1 << i)); 048 int bit_i = (integer & (1 << i)); 055 /* Ascii 219 => dark carret, Ascii 177 = 049 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 056 unsigned char ascii_code = bit_i?219:177 050 unsigned char ascii_code = bit_i?219:177; 057 sos_x86_videomem_putchar(row, col++, 051 sos_x86_videomem_putchar(row, col++, 058 attribute, 052 attribute, 059 ascii_code); 053 ascii_code); 060 } 054 } 061 } 055 } 062 056 063 057 064 /* Clock IRQ handler */ 058 /* Clock IRQ handler */ 065 static void clk_it(int intid) 059 static void clk_it(int intid) 066 { 060 { 067 static sos_ui32_t clock_count = 0; 061 static sos_ui32_t clock_count = 0; 068 062 069 display_bits(0, 48, 063 display_bits(0, 48, 070 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 064 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 071 clock_count); 065 clock_count); 072 clock_count++; 066 clock_count++; 073 067 074 /* Execute the expired timeout actions (if a << 075 sos_time_do_tick(); << 076 << 077 /* Update scheduler statistics and status */ << 078 sos_sched_do_timer_tick(); << 079 } 068 } 080 069 081 !! 070 /* Page fault exception handler */ 082 /* =========================================== !! 071 static void pgflt_ex(int exid) 083 * Page fault exception handling << 084 */ << 085 << 086 << 087 /* Page fault exception handler with demand pa << 088 static void pgflt_ex(int intid, struct sos_cpu << 089 { << 090 static sos_ui32_t demand_paging_count = 0; << 091 sos_vaddr_t faulting_vaddr = sos_cpu_contex << 092 sos_paddr_t ppage_paddr; << 093 << 094 if (sos_cpu_context_is_in_user_mode(ctxt)) << 095 { << 096 /* User-mode page faults are considered << 097 moment */ << 098 sos_bochs_printf("Unresolved USER page F << 099 sos_cpu_context_get_PC( << 100 (unsigned)faulting_vadd << 101 (unsigned)sos_cpu_conte << 102 sos_bochs_printf("Terminating User threa << 103 sos_thread_exit(); << 104 } << 105 << 106 /* Check if address is covered by any VMM ra << 107 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v << 108 { << 109 /* No: The page fault is out of any kern << 110 the moment, we don't handle this. */ << 111 sos_display_fatal_error("Unresolved page << 112 sos_cpu_context_ << 113 (unsigned)faulti << 114 (unsigned)sos_cp << 115 SOS_ASSERT_FATAL(! "Got page fault (note << 116 } << 117 << 118 << 119 /* << 120 * Demand paging in kernel space << 121 */ << 122 << 123 /* Update the number of demand paging reques << 124 demand_paging_count ++; << 125 display_bits(0, 0, << 126 SOS_X86_VIDEO_FG_LTRED | SOS_X8 << 127 demand_paging_count); << 128 << 129 /* Allocate a new page for the virtual addre << 130 ppage_paddr = sos_physmem_ref_physpage_new(F << 131 if (! ppage_paddr) << 132 SOS_ASSERT_FATAL(! "TODO: implement swap. << 133 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp << 134 SO << 135 FA << 136 SO << 137 | << 138 | << 139 sos_physmem_unref_physpage(ppage_paddr); << 140 << 141 /* Ok, we can now return to interrupted cont << 142 } << 143 << 144 << 145 /* =========================================== << 146 * Demonstrate the use of SOS kernel threads << 147 * - Kernel Threads are created with various << 148 * state is printed on both the console and << 149 * - For tests regarding threads' synchroniza << 150 */ << 151 << 152 struct thr_arg << 153 { << 154 char character; << 155 int color; << 156 << 157 int col; << 158 int row; << 159 }; << 160 << 161 << 162 static void demo_thread(void *arg) << 163 { 072 { 164 struct thr_arg *thr_arg = (struct thr_arg*)a !! 073 sos_bochs_printf("Got page fault\n"); 165 int progress = 0; !! 074 sos_x86_videomem_printf(10, 30, 166 !! 075 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 167 sos_bochs_printf("start %c", thr_arg->charac !! 076 "Got EXPECTED (?) Page fault ! But where ???"); 168 while (1) !! 077 for (;;) ; 169 { << 170 progress ++; << 171 display_bits(thr_arg->row, thr_arg->col+ << 172 << 173 sos_bochs_putchar(thr_arg->character); << 174 << 175 /* Yield the CPU to another thread somet << 176 if ((random() % 100) == 0) << 177 { << 178 sos_bochs_printf("[37myield(%c)[m\ << 179 sos_x86_videomem_putchar(thr_arg->ro << 180 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 181 sos_x86_videomem_putchar(thr_arg->ro << 182 } << 183 << 184 /* Go to sleep some other times... */ << 185 else if ((random() % 200) == 0) << 186 { << 187 struct sos_time t = (struct sos_time << 188 sos_bochs_printf("[37msleep1(%c)[m << 189 sos_x86_videomem_putchar(thr_arg->ro << 190 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 191 SOS_ASSERT_FATAL(sos_time_is_zero(& << 192 sos_x86_videomem_putchar(thr_arg->ro << 193 } << 194 << 195 /* Go to sleep for a longer time some ot << 196 else if ((random() % 300) == 0) << 197 { << 198 struct sos_time t = (struct sos_time << 199 sos_bochs_printf("[37msleep2(%c)[m << 200 sos_x86_videomem_putchar(thr_arg->ro << 201 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 202 SOS_ASSERT_FATAL(sos_time_is_zero(& << 203 sos_x86_videomem_putchar(thr_arg->ro << 204 } << 205 << 206 /* Infinite loop otherwise */ << 207 } << 208 } 078 } 209 079 210 !! 080 static void test_paging(sos_vaddr_t sos_kernel_core_top_vaddr) 211 static void test_thread() << 212 { 081 { 213 /* "static" variables because we want them t !! 082 /* The (linear) address of the page holding the code we are 214 function returns */ !! 083 currently executing */ 215 static struct thr_arg arg_b, arg_c, arg_d, a !! 084 sos_vaddr_t vpage_code = SOS_PAGE_ALIGN_INF(test_paging); 216 sos_ui32_t flags; !! 085 217 !! 086 /* The new physical page that will hold the code */ 218 sos_disable_IRQs(flags); !! 087 sos_paddr_t ppage_new; 219 !! 088 220 arg_b = (struct thr_arg) { .character='b', . !! 089 /* Where this page will be mapped temporarily in order to copy the 221 sos_create_kernel_thread("YO[b]", demo_threa !! 090 code into it: right after the kernel code/data */ 222 !! 091 sos_vaddr_t vpage_tmp = sos_kernel_core_top_vaddr; 223 arg_c = (struct thr_arg) { .character='c', . << 224 sos_create_kernel_thread("YO[c]", demo_threa << 225 << 226 arg_d = (struct thr_arg) { .character='d', . << 227 sos_create_kernel_thread("YO[d]", demo_threa << 228 << 229 arg_e = (struct thr_arg) { .character='e', . << 230 sos_create_kernel_thread("YO[e]", demo_threa << 231 << 232 arg_R = (struct thr_arg) { .character='R', . << 233 sos_create_kernel_thread("YO[R]", demo_threa << 234 092 235 arg_S = (struct thr_arg) { .character='S', . !! 093 unsigned i; 236 sos_create_kernel_thread("YO[S]", demo_threa << 237 094 238 sos_restore_IRQs(flags); !! 095 /* Bind the page fault exception to one of our routines */ 239 } !! 096 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, >> 097 pgflt_ex); 240 098 >> 099 /* >> 100 * Test 1: move the page where we execute the code elsewhere in >> 101 * physical memory >> 102 */ >> 103 sos_x86_videomem_printf(4, 0, >> 104 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, >> 105 "Moving current code elsewhere in physical memory:"); 241 106 242 /* =========================================== << 243 * An operating system MUST always have a read << 244 * what would the CPU have to execute ?! << 245 */ << 246 static void idle_thread() << 247 { << 248 sos_ui32_t idle_twiddle = 0; << 249 107 250 while (1) !! 108 /* Allocate a new physical page */ >> 109 ppage_new = sos_physmem_ref_physpage_new(FALSE); >> 110 if (! ppage_new) 251 { 111 { 252 /* Remove this instruction if you get an !! 112 /* STOP ! No memory left */ 253 exception (old 80386 CPU) */ !! 113 sos_x86_videomem_putstring(20, 0, 254 asm("hlt\n"); !! 114 SOS_X86_VIDEO_FG_LTRED 255 !! 115 | SOS_X86_VIDEO_BG_BLUE, 256 idle_twiddle ++; !! 116 "test_paging : Cannot allocate page"); 257 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE !! 117 return; 258 idle_twiddle); << 259 << 260 /* Lend the CPU to some other thread */ << 261 sos_thread_yield(); << 262 } 118 } 263 } << 264 << 265 119 266 /* =========================================== !! 120 sos_x86_videomem_printf(5, 0, 267 * Kernel thread showing some CPU usage statis !! 121 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 268 */ !! 122 "Hello from the address 0x%x in physical memory", 269 static void stat_thread() !! 123 sos_paging_get_paddr(vpage_code)); 270 { !! 124 271 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) 272 { 185 { 273 sos_ui32_t flags; !! 186 unsigned *pint = (unsigned *)SOS_PAGE_ALIGN_INF(i); 274 sos_ui32_t load1, load5, load15; !! 187 sos_bochs_printf("Test vaddr 0x%x : val=", (unsigned)pint); 275 char str1[11], str5[11], str15[11]; !! 188 sos_x86_videomem_printf(10, 0, 276 struct sos_time t; << 277 t.sec = 1; << 278 t.nanosec = 0; << 279 << 280 sos_thread_sleep(& t); << 281 << 282 sos_disable_IRQs(flags); << 283 << 284 /* The IDLE task is EXcluded in the foll << 285 sos_load_get_sload(&load1, &load5, &load << 286 sos_load_to_string(str1, load1); << 287 sos_load_to_string(str5, load5); << 288 sos_load_to_string(str15, load15); << 289 sos_x86_videomem_printf(16, 34, << 290 SOS_X86_VIDEO_FG << 291 "Kernel (- Idle) << 292 str1, str5, str1 << 293 << 294 sos_load_get_uload(&load1, &load5, &load << 295 sos_load_to_string(str1, load1); << 296 sos_load_to_string(str5, load5); << 297 sos_load_to_string(str15, load15); << 298 sos_x86_videomem_printf(17, 34, << 299 SOS_X86_VIDEO_FG 189 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 300 "User: %s %s %s !! 190 "Test vaddr 0x%x : val= ", 301 str1, str5, str1 !! 191 (unsigned)pint); 302 !! 192 sos_bochs_printf("0x%x\n", *pint); 303 sos_load_get_uratio(&load1, &load5, &loa !! 193 sos_x86_videomem_printf(10, 30, 304 sos_load_to_string(str1, load1); << 305 sos_load_to_string(str5, load5); << 306 sos_load_to_string(str15, load15); << 307 sos_x86_videomem_printf(18, 34, << 308 SOS_X86_VIDEO_FG 194 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 309 "User CPU %%: %s !! 195 "0x%x ", *pint); 310 str1, str5, str1 << 311 << 312 /* The IDLE task is INcluded in the foll << 313 sos_load_get_sratio(&load1, &load5, &loa << 314 sos_load_to_string(str1, load1); << 315 sos_load_to_string(str5, load5); << 316 sos_load_to_string(str15, load15); << 317 sos_x86_videomem_printf(19, 34, << 318 SOS_X86_VIDEO_FG << 319 "Kernel CPU %% ( << 320 str1, str5, str1 << 321 sos_restore_IRQs(flags); << 322 } 196 } 323 } << 324 197 >> 198 /* BAD ! Did not get the page fault... */ >> 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); >> 203 } 325 204 326 /* =========================================== !! 205 /* The C entry point of our operating system */ 327 * The C entry point of our operating system << 328 */ << 329 void sos_main(unsigned long magic, unsigned lo 206 void sos_main(unsigned long magic, unsigned long addr) 330 { 207 { 331 unsigned i; 208 unsigned i; 332 sos_paddr_t sos_kernel_core_base_paddr, sos_ 209 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 333 struct sos_time tick_resolution; << 334 210 335 /* Grub sends us a structure, called multibo 211 /* Grub sends us a structure, called multiboot_info_t with a lot of 336 precious informations about the system, s 212 precious informations about the system, see the multiboot 337 documentation for more information. */ 213 documentation for more information. */ 338 multiboot_info_t *mbi; 214 multiboot_info_t *mbi; 339 mbi = (multiboot_info_t *) addr; 215 mbi = (multiboot_info_t *) addr; 340 216 341 /* Setup bochs and console, and clear the co 217 /* Setup bochs and console, and clear the console */ 342 sos_bochs_setup(); 218 sos_bochs_setup(); 343 219 344 sos_x86_videomem_setup(); 220 sos_x86_videomem_setup(); 345 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 221 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 346 222 347 /* Greetings from SOS */ 223 /* Greetings from SOS */ 348 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 224 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 349 /* Loaded with Grub */ 225 /* Loaded with Grub */ 350 sos_x86_videomem_printf(1, 0, 226 sos_x86_videomem_printf(1, 0, 351 SOS_X86_VIDEO_FG_Y 227 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 352 "Welcome From GRUB 228 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 353 "SOS article 7", ' !! 229 "SOS", ',', 354 (unsigned)(mbi->me 230 (unsigned)(mbi->mem_upper >> 10) + 1, 355 (unsigned)mbi->mem 231 (unsigned)mbi->mem_upper); 356 else 232 else 357 /* Not loaded with grub */ 233 /* Not loaded with grub */ 358 sos_x86_videomem_printf(1, 0, 234 sos_x86_videomem_printf(1, 0, 359 SOS_X86_VIDEO_FG_Y 235 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 360 "Welcome to SOS ar !! 236 "Welcome to SOS"); 361 237 362 sos_bochs_putstring("Message in a bochs: Thi !! 238 sos_bochs_putstring("Message in a bochs\n"); 363 239 364 /* Setup CPU segmentation and IRQ subsystem 240 /* Setup CPU segmentation and IRQ subsystem */ 365 sos_gdt_subsystem_setup(); !! 241 sos_gdt_setup(); 366 sos_idt_subsystem_setup(); !! 242 sos_idt_setup(); 367 243 368 /* Setup SOS IRQs and exceptions subsystem * 244 /* Setup SOS IRQs and exceptions subsystem */ 369 sos_exception_subsystem_setup(); !! 245 sos_exceptions_setup(); 370 sos_irq_subsystem_setup(); !! 246 sos_irq_setup(); 371 247 372 /* Configure the timer so as to raise the IR 248 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 373 sos_i8254_set_frequency(100); 249 sos_i8254_set_frequency(100); 374 250 375 /* Setup the kernel time subsystem to get pr << 376 ticks into account */ << 377 tick_resolution = (struct sos_time) { .sec=0 << 378 sos_time_subsysem_setup(& tick_resolution); << 379 251 380 /* We need a multiboot-compliant boot loader 252 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 381 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 253 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 382 { 254 { 383 sos_x86_videomem_putstring(20, 0, 255 sos_x86_videomem_putstring(20, 0, 384 SOS_X86_VIDEO 256 SOS_X86_VIDEO_FG_LTRED 385 | SOS_X86_V 257 | SOS_X86_VIDEO_BG_BLUE 386 | SOS_X86_V 258 | SOS_X86_VIDEO_FG_BLINKING, 387 "I'm not load 259 "I'm not loaded with Grub !"); 388 /* STOP ! */ 260 /* STOP ! */ 389 for (;;) 261 for (;;) 390 continue; 262 continue; 391 } 263 } 392 264 393 /* << 394 * Some interrupt handlers << 395 */ << 396 << 397 /* Binding some HW interrupts and exceptions 265 /* Binding some HW interrupts and exceptions to software routines */ 398 sos_irq_set_routine(SOS_IRQ_TIMER, 266 sos_irq_set_routine(SOS_IRQ_TIMER, 399 clk_it); !! 267 clk_it); 400 !! 268 /* Enabling the HW interrupts here, this will make the timer HW 401 /* !! 269 interrupt call our clk_it handler */ 402 * Setup physical memory management !! 270 asm volatile ("sti\n"); 403 */ << 404 << 405 /* Multiboot says: "The value returned for u 271 /* Multiboot says: "The value returned for upper memory is maximally 406 the address of the first upper memory hol 272 the address of the first upper memory hole minus 1 megabyte.". It 407 also adds: "It is not guaranteed to be th 273 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 408 sos_physmem_subsystem_setup((mbi->mem_upper< !! 274 sos_physmem_setup((mbi->mem_upper<<10) + (1<<20), 409 & sos_kernel_cor !! 275 & sos_kernel_core_base_paddr, 410 & sos_kernel_cor !! 276 & sos_kernel_core_top_paddr); 411 277 412 /* 278 /* 413 * Switch to paged-memory mode 279 * Switch to paged-memory mode 414 */ 280 */ 415 281 416 /* Disabling interrupts should seem more cor 282 /* Disabling interrupts should seem more correct, but it's not really 417 necessary at this stage */ 283 necessary at this stage */ 418 SOS_ASSERT_FATAL(SOS_OK == !! 284 if (sos_paging_setup(sos_kernel_core_base_paddr, 419 sos_paging_subsystem_setup( !! 285 sos_kernel_core_top_paddr)) 420 !! 286 sos_bochs_printf("Could not setup paged memory mode\n"); 421 !! 287 sos_x86_videomem_printf(2, 0, 422 /* Bind the page fault exception */ !! 288 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 423 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA !! 289 "Paged-memory mode is activated"); 424 pgflt_ex); !! 290 425 !! 291 test_paging(sos_kernel_core_top_paddr); 426 /* !! 292 427 * Setup kernel virtual memory allocator !! 293 /* An operatig system never ends */ 428 */ !! 294 for (;;) 429 !! 295 continue; 430 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ << 431 sos_kernel_ << 432 bootstrap_s << 433 bootstrap_s << 434 + bootstrap << 435 sos_bochs_printf("Could not setup the Kern << 436 << 437 if (sos_kmalloc_subsystem_setup()) << 438 sos_bochs_printf("Could not setup the Kmal << 439 296 440 /* !! 297 return; 441 * Initialize the MMU context subsystem << 442 */ << 443 sos_mm_context_subsystem_setup(); << 444 << 445 /* << 446 * Initialize the CPU context subsystem << 447 */ << 448 sos_cpu_context_subsystem_setup(); << 449 << 450 /* << 451 * Bind the syscall handler to its software << 452 */ << 453 sos_swintr_subsystem_setup(); << 454 << 455 << 456 /* << 457 * Initialize the Kernel thread and schedule << 458 */ << 459 << 460 /* Initialize kernel thread subsystem */ << 461 sos_thread_subsystem_setup(bootstrap_stack_b << 462 bootstrap_stack_s << 463 << 464 /* Initialize the scheduler */ << 465 sos_sched_subsystem_setup(); << 466 << 467 /* Declare the IDLE thread */ << 468 SOS_ASSERT_FATAL(sos_create_kernel_thread("i << 469 SO << 470 << 471 /* Prepare the stats subsystem */ << 472 sos_load_subsystem_setup(); << 473 << 474 /* Declare a thread that prints some stats * << 475 SOS_ASSERT_FATAL(sos_create_kernel_thread("s << 476 NU << 477 SO << 478 << 479 << 480 /* << 481 * Initialize process stuff << 482 */ << 483 sos_process_subsystem_setup(); << 484 << 485 << 486 /* Enabling the HW interrupts here, this wil << 487 interrupt call the scheduler */ << 488 asm volatile ("sti\n"); << 489 << 490 /* Run some tests involving USER processes a << 491 extern void test_art7(); << 492 test_art7(); << 493 << 494 /* Now run some Kernel threads just for fun << 495 extern void MouseSim(); << 496 MouseSim(); << 497 test_thread(); << 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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