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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 <sos/kmem_vmm.h> !! 030 #include <sos/list.h> 030 #include <sos/kmalloc.h> << 031 #include <sos/time.h> << 032 #include <sos/thread.h> << 033 #include <sos/klibc.h> 031 #include <sos/klibc.h> 034 #include <sos/assert.h> 032 #include <sos/assert.h> 035 #include <drivers/x86_videomem.h> 033 #include <drivers/x86_videomem.h> 036 #include <drivers/bochs.h> 034 #include <drivers/bochs.h> 037 035 038 036 039 /* Helper function to display each bits of a 3 037 /* Helper function to display each bits of a 32bits integer on the 040 screen as dark or light carrets */ 038 screen as dark or light carrets */ 041 void display_bits(unsigned char row, unsigned !! 039 static void display_bits(unsigned char row, unsigned char col, 042 unsigned char attribute, !! 040 unsigned char attribute, 043 sos_ui32_t integer) !! 041 sos_ui32_t integer) 044 { 042 { 045 int i; 043 int i; 046 /* Scan each bit of the integer, MSb first * 044 /* Scan each bit of the integer, MSb first */ 047 for (i = 31 ; i >= 0 ; i--) 045 for (i = 31 ; i >= 0 ; i--) 048 { 046 { 049 /* Test if bit i of 'integer' is set */ 047 /* Test if bit i of 'integer' is set */ 050 int bit_i = (integer & (1 << i)); 048 int bit_i = (integer & (1 << i)); 051 /* Ascii 219 => dark carret, Ascii 177 = 049 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 052 unsigned char ascii_code = bit_i?219:177 050 unsigned char ascii_code = bit_i?219:177; 053 sos_x86_videomem_putchar(row, col++, 051 sos_x86_videomem_putchar(row, col++, 054 attribute, 052 attribute, 055 ascii_code); 053 ascii_code); 056 } 054 } 057 } 055 } 058 056 059 057 060 /* Clock IRQ handler */ 058 /* Clock IRQ handler */ 061 static void clk_it(int intid) 059 static void clk_it(int intid) 062 { 060 { 063 static sos_ui32_t clock_count = 0; 061 static sos_ui32_t clock_count = 0; 064 062 065 display_bits(0, 48, 063 display_bits(0, 48, 066 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 064 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 067 clock_count); 065 clock_count); 068 clock_count++; 066 clock_count++; 069 067 070 /* Execute the expired timeout actions (if a << 071 sos_time_do_tick(); << 072 } 068 } 073 069 074 !! 070 /* Page fault exception handler */ 075 /* =========================================== !! 071 static void pgflt_ex(int exid) 076 * Page fault exception handling << 077 */ << 078 << 079 /* Helper function to dump a backtrace on boch << 080 static void dump_backtrace(const struct sos_cp << 081 sos_vaddr_t stack_b << 082 sos_size_t stack_s << 083 sos_bool_t on_conso << 084 sos_bool_t on_bochs << 085 { 072 { 086 static void backtracer(sos_vaddr_t PC, !! 073 sos_bochs_printf("Got page fault\n"); 087 sos_vaddr_t params, !! 074 sos_x86_videomem_printf(10, 30, 088 sos_ui32_t depth, !! 075 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 089 void *custom_arg) !! 076 "Got EXPECTED (?) Page fault ! But where ???"); 090 { !! 077 for (;;) ; 091 sos_ui32_t invalid = 0xffffffff, *arg1, << 092 << 093 /* Get the address of the first 3 argume << 094 frame. Among these arguments, 0, 1, 2 << 095 meaningful (depending on how many arg << 096 take). */ << 097 arg1 = (sos_ui32_t*)params; << 098 arg2 = (sos_ui32_t*)(params+4); << 099 arg3 = (sos_ui32_t*)(params+8); << 100 arg4 = (sos_ui32_t*)(params+12); << 101 << 102 /* Make sure the addresses of these argu << 103 stack boundaries */ << 104 #define INTERVAL_OK(b,v,u) ( ((b) <= (sos_vadd << 105 && ((sos_vaddr_t) << 106 if (!INTERVAL_OK(stack_bottom, arg1, sta << 107 arg1 = &invalid; << 108 if (!INTERVAL_OK(stack_bottom, arg2, sta << 109 arg2 = &invalid; << 110 if (!INTERVAL_OK(stack_bottom, arg3, sta << 111 arg3 = &invalid; << 112 if (!INTERVAL_OK(stack_bottom, arg4, sta << 113 arg4 = &invalid; << 114 << 115 /* Print the function context for this f << 116 if (on_bochs) << 117 sos_bochs_printf("[%d] PC=0x%x arg1=0x << 118 (unsigned)depth, (uns << 119 (unsigned)*arg1, (uns << 120 (unsigned)*arg3); << 121 << 122 if (on_console) << 123 sos_x86_videomem_printf(23-depth, 3, << 124 SOS_X86_VIDEO_ << 125 | SOS_X86_VI << 126 "[%d] PC=0x%x << 127 (unsigned)dept << 128 (unsigned)*arg << 129 (unsigned)*arg << 130 << 131 } << 132 << 133 sos_backtrace(cpu_state, 15, stack_bottom, s << 134 } 078 } 135 079 136 !! 080 static void test_paging(sos_vaddr_t sos_kernel_core_top_vaddr) 137 /* Page fault exception handler with demand pa << 138 static void pgflt_ex(int intid, const struct s << 139 { 081 { 140 static sos_ui32_t demand_paging_count = 0; !! 082 /* The (linear) address of the page holding the code we are 141 sos_vaddr_t faulting_vaddr = sos_cpu_context !! 083 currently executing */ 142 sos_paddr_t ppage_paddr; !! 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; 143 092 144 /* Check if address is covered by any VMM ra !! 093 unsigned i; 145 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v << 146 { << 147 /* No: The page fault is out of any kern << 148 the moment, we don't handle this. */ << 149 dump_backtrace(ctxt, << 150 bootstrap_stack_bottom, << 151 bootstrap_stack_size, << 152 TRUE, TRUE); << 153 sos_display_fatal_error("Unresolved page << 154 sos_cpu_context_ << 155 (unsigned)faulti << 156 (unsigned)sos_cp << 157 SOS_ASSERT_FATAL(! "Got page fault (note << 158 } << 159 094 >> 095 /* Bind the page fault exception to one of our routines */ >> 096 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, >> 097 pgflt_ex); 160 098 161 /* 099 /* 162 * Demand paging !! 100 * Test 1: move the page where we execute the code elsewhere in >> 101 * physical memory 163 */ 102 */ 164 !! 103 sos_x86_videomem_printf(4, 0, 165 /* Update the number of demand paging reques !! 104 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 166 demand_paging_count ++; !! 105 "Moving current code elsewhere in physical memory:"); 167 display_bits(0, 0, << 168 SOS_X86_VIDEO_FG_LTRED | SOS_X8 << 169 demand_paging_count); << 170 << 171 /* Allocate a new page for the virtual addre << 172 ppage_paddr = sos_physmem_ref_physpage_new(F << 173 if (! ppage_paddr) << 174 SOS_ASSERT_FATAL(! "TODO: implement swap. << 175 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp << 176 SO << 177 FA << 178 SO << 179 | << 180 | << 181 sos_physmem_unref_physpage(ppage_paddr); << 182 << 183 /* Ok, we can now return to interrupted cont << 184 } << 185 << 186 << 187 /* =========================================== << 188 * Demonstrate the use of SOS kernel threads << 189 * - Kernel Threads are created with various << 190 * state is printed on both the console and << 191 * - For tests regarding threads' synchroniza << 192 */ << 193 << 194 struct thr_arg << 195 { << 196 char character; << 197 int color; << 198 << 199 int col; << 200 int row; << 201 }; << 202 106 203 107 204 static void demo_thread(void *arg) !! 108 /* Allocate a new physical page */ 205 { !! 109 ppage_new = sos_physmem_ref_physpage_new(FALSE); 206 struct thr_arg *thr_arg = (struct thr_arg*)a !! 110 if (! ppage_new) 207 int progress = 0; << 208 << 209 sos_bochs_printf("start %c", thr_arg->charac << 210 while (1) << 211 { 111 { 212 progress ++; !! 112 /* STOP ! No memory left */ 213 display_bits(thr_arg->row, thr_arg->col+ !! 113 sos_x86_videomem_putstring(20, 0, 214 !! 114 SOS_X86_VIDEO_FG_LTRED 215 sos_bochs_putchar(thr_arg->character); !! 115 | SOS_X86_VIDEO_BG_BLUE, 216 !! 116 "test_paging : Cannot allocate page"); 217 /* Yield the CPU to another thread somet !! 117 return; 218 if ((random() % 100) == 0) << 219 { << 220 sos_bochs_printf("[37myield(%c)[m\ << 221 sos_x86_videomem_putchar(thr_arg->ro << 222 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 223 sos_x86_videomem_putchar(thr_arg->ro << 224 } << 225 << 226 /* Go to sleep some other times... */ << 227 else if ((random() % 200) == 0) << 228 { << 229 struct sos_time t = (struct sos_time << 230 sos_bochs_printf("[37msleep1(%c)[m << 231 sos_x86_videomem_putchar(thr_arg->ro << 232 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 233 SOS_ASSERT_FATAL(sos_time_is_zero(& << 234 sos_x86_videomem_putchar(thr_arg->ro << 235 } << 236 << 237 /* Go to sleep for a longer time some ot << 238 else if ((random() % 300) == 0) << 239 { << 240 struct sos_time t = (struct sos_time << 241 sos_bochs_printf("[37msleep2(%c)[m << 242 sos_x86_videomem_putchar(thr_arg->ro << 243 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 244 SOS_ASSERT_FATAL(sos_time_is_zero(& << 245 sos_x86_videomem_putchar(thr_arg->ro << 246 } << 247 << 248 /* Infinite loop otherwise */ << 249 } 118 } 250 } << 251 << 252 << 253 static void test_thread() << 254 { << 255 /* "static" variables because we want them t << 256 function returns */ << 257 static struct thr_arg arg_b, arg_c, arg_d, a << 258 sos_ui32_t flags; << 259 << 260 sos_disable_IRQs(flags); << 261 << 262 arg_b = (struct thr_arg) { .character='b', . << 263 sos_create_kernel_thread("YO[b]", demo_threa << 264 << 265 arg_c = (struct thr_arg) { .character='c', . << 266 sos_create_kernel_thread("YO[c]", demo_threa << 267 << 268 arg_d = (struct thr_arg) { .character='d', . << 269 sos_create_kernel_thread("YO[d]", demo_threa << 270 << 271 arg_e = (struct thr_arg) { .character='e', . << 272 sos_create_kernel_thread("YO[e]", demo_threa << 273 << 274 arg_R = (struct thr_arg) { .character='R', . << 275 sos_create_kernel_thread("YO[R]", demo_threa << 276 << 277 arg_S = (struct thr_arg) { .character='S', . << 278 sos_create_kernel_thread("YO[S]", demo_threa << 279 << 280 sos_restore_IRQs(flags); << 281 } << 282 119 >> 120 sos_x86_videomem_printf(5, 0, >> 121 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 122 "Hello from the address 0x%x in physical memory", >> 123 sos_paging_get_paddr(vpage_code)); >> 124 >> 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:"); 283 175 284 /* =========================================== !! 176 /* 285 * An operating system MUST always have a read !! 177 * Test 2: make sure the #PF handler works 286 * what would the CPU have to execute ?! !! 178 */ 287 */ << 288 static void idle_thread() << 289 { << 290 sos_ui32_t idle_twiddle = 0; << 291 179 292 while (1) !! 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) 293 { 185 { 294 /* Remove this instruction if you get an !! 186 unsigned *pint = (unsigned *)SOS_PAGE_ALIGN_INF(i); 295 exception (old 80386 CPU) */ !! 187 sos_bochs_printf("Test vaddr 0x%x : val=", (unsigned)pint); 296 asm("hlt\n"); !! 188 sos_x86_videomem_printf(10, 0, 297 !! 189 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 298 idle_twiddle ++; !! 190 "Test vaddr 0x%x : val= ", 299 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE !! 191 (unsigned)pint); 300 idle_twiddle); !! 192 sos_bochs_printf("0x%x\n", *pint); 301 !! 193 sos_x86_videomem_printf(10, 30, 302 /* Lend the CPU to some other thread */ !! 194 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 303 sos_thread_yield(); !! 195 "0x%x ", *pint); 304 } 196 } 305 } << 306 197 >> 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 } 307 204 308 /* =========================================== !! 205 /* The C entry point of our operating system */ 309 * The C entry point of our operating system << 310 */ << 311 void sos_main(unsigned long magic, unsigned lo 206 void sos_main(unsigned long magic, unsigned long addr) 312 { 207 { 313 unsigned i; 208 unsigned i; 314 sos_paddr_t sos_kernel_core_base_paddr, sos_ 209 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 315 struct sos_time tick_resolution; << 316 210 317 /* Grub sends us a structure, called multibo 211 /* Grub sends us a structure, called multiboot_info_t with a lot of 318 precious informations about the system, s 212 precious informations about the system, see the multiboot 319 documentation for more information. */ 213 documentation for more information. */ 320 multiboot_info_t *mbi; 214 multiboot_info_t *mbi; 321 mbi = (multiboot_info_t *) addr; 215 mbi = (multiboot_info_t *) addr; 322 216 323 /* Setup bochs and console, and clear the co 217 /* Setup bochs and console, and clear the console */ 324 sos_bochs_setup(); 218 sos_bochs_setup(); 325 219 326 sos_x86_videomem_setup(); 220 sos_x86_videomem_setup(); 327 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 221 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 328 222 329 /* Greetings from SOS */ 223 /* Greetings from SOS */ 330 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 224 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 331 /* Loaded with Grub */ 225 /* Loaded with Grub */ 332 sos_x86_videomem_printf(1, 0, 226 sos_x86_videomem_printf(1, 0, 333 SOS_X86_VIDEO_FG_Y 227 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 334 "Welcome From GRUB 228 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 335 "SOS article 6.5", !! 229 "SOS", ',', 336 (unsigned)(mbi->me 230 (unsigned)(mbi->mem_upper >> 10) + 1, 337 (unsigned)mbi->mem 231 (unsigned)mbi->mem_upper); 338 else 232 else 339 /* Not loaded with grub */ 233 /* Not loaded with grub */ 340 sos_x86_videomem_printf(1, 0, 234 sos_x86_videomem_printf(1, 0, 341 SOS_X86_VIDEO_FG_Y 235 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 342 "Welcome to SOS ar !! 236 "Welcome to SOS"); 343 237 344 sos_bochs_putstring("Message in a bochs: Thi !! 238 sos_bochs_putstring("Message in a bochs\n"); 345 239 346 /* Setup CPU segmentation and IRQ subsystem 240 /* Setup CPU segmentation and IRQ subsystem */ 347 sos_gdt_subsystem_setup(); !! 241 sos_gdt_setup(); 348 sos_idt_subsystem_setup(); !! 242 sos_idt_setup(); 349 243 350 /* Setup SOS IRQs and exceptions subsystem * 244 /* Setup SOS IRQs and exceptions subsystem */ 351 sos_exception_subsystem_setup(); !! 245 sos_exceptions_setup(); 352 sos_irq_subsystem_setup(); !! 246 sos_irq_setup(); 353 247 354 /* Configure the timer so as to raise the IR 248 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 355 sos_i8254_set_frequency(100); 249 sos_i8254_set_frequency(100); 356 250 357 /* Setup the kernel time subsystem to get pr << 358 ticks into account */ << 359 tick_resolution = (struct sos_time) { .sec=0 << 360 sos_time_subsysem_setup(& tick_resolution); << 361 251 362 /* We need a multiboot-compliant boot loader 252 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 363 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 253 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 364 { 254 { 365 sos_x86_videomem_putstring(20, 0, 255 sos_x86_videomem_putstring(20, 0, 366 SOS_X86_VIDEO 256 SOS_X86_VIDEO_FG_LTRED 367 | SOS_X86_V 257 | SOS_X86_VIDEO_BG_BLUE 368 | SOS_X86_V 258 | SOS_X86_VIDEO_FG_BLINKING, 369 "I'm not load 259 "I'm not loaded with Grub !"); 370 /* STOP ! */ 260 /* STOP ! */ 371 for (;;) 261 for (;;) 372 continue; 262 continue; 373 } 263 } 374 264 375 /* << 376 * Some interrupt handlers << 377 */ << 378 << 379 /* Binding some HW interrupts and exceptions 265 /* Binding some HW interrupts and exceptions to software routines */ 380 sos_irq_set_routine(SOS_IRQ_TIMER, 266 sos_irq_set_routine(SOS_IRQ_TIMER, 381 clk_it); !! 267 clk_it); 382 !! 268 /* Enabling the HW interrupts here, this will make the timer HW 383 /* !! 269 interrupt call our clk_it handler */ 384 * Setup physical memory management !! 270 asm volatile ("sti\n"); 385 */ << 386 << 387 /* Multiboot says: "The value returned for u 271 /* Multiboot says: "The value returned for upper memory is maximally 388 the address of the first upper memory hol 272 the address of the first upper memory hole minus 1 megabyte.". It 389 also adds: "It is not guaranteed to be th 273 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 390 sos_physmem_subsystem_setup((mbi->mem_upper< !! 274 sos_physmem_setup((mbi->mem_upper<<10) + (1<<20), 391 & sos_kernel_cor !! 275 & sos_kernel_core_base_paddr, 392 & sos_kernel_cor !! 276 & sos_kernel_core_top_paddr); 393 277 394 /* 278 /* 395 * Switch to paged-memory mode 279 * Switch to paged-memory mode 396 */ 280 */ 397 281 398 /* Disabling interrupts should seem more cor 282 /* Disabling interrupts should seem more correct, but it's not really 399 necessary at this stage */ 283 necessary at this stage */ 400 SOS_ASSERT_FATAL(SOS_OK == !! 284 if (sos_paging_setup(sos_kernel_core_base_paddr, 401 sos_paging_subsystem_setup( !! 285 sos_kernel_core_top_paddr)) 402 !! 286 sos_bochs_printf("Could not setup paged memory mode\n"); 403 !! 287 sos_x86_videomem_printf(2, 0, 404 /* Bind the page fault exception */ !! 288 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 405 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA !! 289 "Paged-memory mode is activated"); 406 pgflt_ex); !! 290 >> 291 test_paging(sos_kernel_core_top_paddr); >> 292 >> 293 /* An operatig system never ends */ >> 294 for (;;) >> 295 continue; 407 296 408 /* !! 297 return; 409 * Setup kernel virtual memory allocator << 410 */ << 411 << 412 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ << 413 sos_kernel_ << 414 bootstrap_s << 415 bootstrap_s << 416 + bootstrap << 417 sos_bochs_printf("Could not setup the Kern << 418 << 419 if (sos_kmalloc_subsystem_setup()) << 420 sos_bochs_printf("Could not setup the Kmal << 421 << 422 /* << 423 * Initialize the Kernel thread and schedule << 424 */ << 425 << 426 /* Initialize kernel thread subsystem */ << 427 sos_thread_subsystem_setup(bootstrap_stack_b << 428 bootstrap_stack_s << 429 << 430 /* Initialize the scheduler */ << 431 sos_sched_subsystem_setup(); << 432 << 433 /* Declare the IDLE thread */ << 434 SOS_ASSERT_FATAL(sos_create_kernel_thread("i << 435 << 436 /* Enabling the HW interrupts here, this wil << 437 interrupt call the scheduler */ << 438 asm volatile ("sti\n"); << 439 << 440 << 441 /* Now run some Kernel threads just for fun << 442 extern void MouseSim(); << 443 MouseSim(); << 444 test_thread(); << 445 << 446 /* << 447 * We can safely exit from this function now << 448 * an idle Kernel thread ready to make the C << 449 * << 450 * However, we must EXPLICITELY call sos_thr << 451 * simple "return" will return nowhere ! Act << 452 * was initialized by the Grub bootstrap sta << 453 * word "thread" did not exist. This means t << 454 * setup in order for a return here to call << 455 * automagically. Hence we must call it manu << 456 * kernel thread where we must do this manua << 457 */ << 458 sos_bochs_printf("Bye from primary thread !\ << 459 sos_thread_exit(); << 460 SOS_FATAL_ERROR("No trespassing !"); << 461 } 298 }
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