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001 /* Copyright (C) 2004 The SOS Team 001 /* Copyright (C) 2004 The SOS Team 002 Copyright (C) 1999 Free Software Foundatio << 003 002 004 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 005 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 006 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 007 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 008 007 009 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU General Public License for more details 011 GNU General Public License for more details. 013 012 014 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 015 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 017 USA. 016 USA. 018 */ 017 */ 019 018 020 /* Include definitions of the multiboot standa 019 /* Include definitions of the multiboot standard */ 021 #include <bootstrap/multiboot.h> 020 #include <bootstrap/multiboot.h> 022 #include <hwcore/idt.h> 021 #include <hwcore/idt.h> 023 #include <hwcore/gdt.h> 022 #include <hwcore/gdt.h> 024 #include <hwcore/irq.h> 023 #include <hwcore/irq.h> 025 #include <hwcore/exception.h> 024 #include <hwcore/exception.h> 026 #include <hwcore/i8254.h> 025 #include <hwcore/i8254.h> 027 #include <sos/list.h> 026 #include <sos/list.h> 028 #include <sos/physmem.h> 027 #include <sos/physmem.h> 029 #include <hwcore/paging.h> 028 #include <hwcore/paging.h> 030 #include <sos/list.h> !! 029 #include <hwcore/mm_context.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> 031 #include <sos/klibc.h> 036 #include <sos/klibc.h> 032 #include <sos/assert.h> 037 #include <sos/assert.h> 033 #include <drivers/x86_videomem.h> 038 #include <drivers/x86_videomem.h> 034 #include <drivers/bochs.h> 039 #include <drivers/bochs.h> >> 040 #include <sos/calcload.h> 035 041 036 042 037 /* Helper function to display each bits of a 3 043 /* Helper function to display each bits of a 32bits integer on the 038 screen as dark or light carrets */ 044 screen as dark or light carrets */ 039 static void display_bits(unsigned char row, un !! 045 void display_bits(unsigned char row, unsigned char col, 040 unsigned char attribu !! 046 unsigned char attribute, 041 sos_ui32_t integer) !! 047 sos_ui32_t integer) 042 { 048 { 043 int i; 049 int i; 044 /* Scan each bit of the integer, MSb first * 050 /* Scan each bit of the integer, MSb first */ 045 for (i = 31 ; i >= 0 ; i--) 051 for (i = 31 ; i >= 0 ; i--) 046 { 052 { 047 /* Test if bit i of 'integer' is set */ 053 /* Test if bit i of 'integer' is set */ 048 int bit_i = (integer & (1 << i)); 054 int bit_i = (integer & (1 << i)); 049 /* Ascii 219 => dark carret, Ascii 177 = 055 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 050 unsigned char ascii_code = bit_i?219:177 056 unsigned char ascii_code = bit_i?219:177; 051 sos_x86_videomem_putchar(row, col++, 057 sos_x86_videomem_putchar(row, col++, 052 attribute, 058 attribute, 053 ascii_code); 059 ascii_code); 054 } 060 } 055 } 061 } 056 062 057 063 058 /* Clock IRQ handler */ 064 /* Clock IRQ handler */ 059 static void clk_it(int intid) 065 static void clk_it(int intid) 060 { 066 { 061 static sos_ui32_t clock_count = 0; 067 static sos_ui32_t clock_count = 0; 062 068 063 display_bits(0, 48, 069 display_bits(0, 48, 064 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 070 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 065 clock_count); 071 clock_count); 066 clock_count++; 072 clock_count++; 067 073 068 } !! 074 /* Execute the expired timeout actions (if any) */ >> 075 sos_time_do_tick(); 069 076 070 /* Page fault exception handler */ !! 077 /* Update scheduler statistics and status */ 071 static void pgflt_ex(int exid) !! 078 sos_sched_do_timer_tick(); 072 { << 073 sos_bochs_printf("Got page fault\n"); << 074 sos_x86_videomem_printf(10, 30, << 075 SOS_X86_VIDEO_FG_LTR << 076 "Got EXPECTED (?) Pa << 077 for (;;) ; << 078 } 079 } 079 080 080 static void test_paging(sos_vaddr_t sos_kernel !! 081 >> 082 /* ====================================================================== >> 083 * Page fault exception handling >> 084 */ >> 085 >> 086 >> 087 /* Page fault exception handler with demand paging for the kernel */ >> 088 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 081 { 089 { 082 /* The (linear) address of the page holding !! 090 static sos_ui32_t demand_paging_count = 0; 083 currently executing */ !! 091 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 084 sos_vaddr_t vpage_code = SOS_PAGE_ALIGN_INF( !! 092 sos_paddr_t ppage_paddr; 085 << 086 /* The new physical page that will hold the << 087 sos_paddr_t ppage_new; << 088 << 089 /* Where this page will be mapped temporaril << 090 code into it: right after the kernel code << 091 sos_vaddr_t vpage_tmp = sos_kernel_core_top_ << 092 093 093 unsigned i; !! 094 if (sos_cpu_context_is_in_user_mode(ctxt)) >> 095 { >> 096 /* User-mode page faults are considered unresolved for the >> 097 moment */ >> 098 sos_bochs_printf("Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\n", >> 099 sos_cpu_context_get_PC(ctxt), >> 100 (unsigned)faulting_vaddr, >> 101 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 102 sos_bochs_printf("Terminating User thread\n"); >> 103 sos_thread_exit(); >> 104 } >> 105 >> 106 /* Check if address is covered by any VMM range */ >> 107 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) >> 108 { >> 109 /* No: The page fault is out of any kernel virtual region. For >> 110 the moment, we don't handle this. */ >> 111 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", >> 112 sos_cpu_context_get_PC(ctxt), >> 113 (unsigned)faulting_vaddr, >> 114 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 115 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); >> 116 } 094 117 095 /* Bind the page fault exception to one of o << 096 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA << 097 pgflt_ex); << 098 118 099 /* 119 /* 100 * Test 1: move the page where we execute th !! 120 * Demand paging in kernel space 101 * physical memory << 102 */ 121 */ 103 sos_x86_videomem_printf(4, 0, !! 122 104 SOS_X86_VIDEO_FG_LTG !! 123 /* Update the number of demand paging requests handled */ 105 "Moving current code !! 124 demand_paging_count ++; >> 125 display_bits(0, 0, >> 126 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, >> 127 demand_paging_count); >> 128 >> 129 /* Allocate a new page for the virtual address */ >> 130 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); >> 131 if (! ppage_paddr) >> 132 SOS_ASSERT_FATAL(! "TODO: implement swap. (Out of mem in demand paging because no swap for kernel yet !)"); >> 133 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, >> 134 SOS_PAGE_ALIGN_INF(faulting_vaddr), >> 135 FALSE, >> 136 SOS_VM_MAP_PROT_READ >> 137 | SOS_VM_MAP_PROT_WRITE >> 138 | SOS_VM_MAP_ATOMIC)); >> 139 sos_physmem_unref_physpage(ppage_paddr); >> 140 >> 141 /* Ok, we can now return to interrupted context */ >> 142 } >> 143 >> 144 >> 145 /* ====================================================================== >> 146 * Demonstrate the use of SOS kernel threads >> 147 * - Kernel Threads are created with various priorities and their >> 148 * state is printed on both the console and the bochs' 0xe9 port >> 149 * - For tests regarding threads' synchronization, see mouse_sim.c >> 150 */ >> 151 >> 152 struct thr_arg >> 153 { >> 154 char character; >> 155 int color; >> 156 >> 157 int col; >> 158 int row; >> 159 }; >> 160 106 161 >> 162 static void demo_thread(void *arg) >> 163 { >> 164 struct thr_arg *thr_arg = (struct thr_arg*)arg; >> 165 int progress = 0; 107 166 108 /* Allocate a new physical page */ !! 167 sos_bochs_printf("start %c", thr_arg->character); 109 ppage_new = sos_physmem_ref_physpage_new(FAL !! 168 while (1) 110 if (! ppage_new) << 111 { 169 { 112 /* STOP ! No memory left */ !! 170 progress ++; 113 sos_x86_videomem_putstring(20, 0, !! 171 display_bits(thr_arg->row, thr_arg->col+1, thr_arg->color, progress); 114 SOS_X86_VIDEO !! 172 115 | SOS_X86_V !! 173 sos_bochs_putchar(thr_arg->character); 116 "test_paging !! 174 117 return; !! 175 /* Yield the CPU to another thread sometimes... */ >> 176 if ((random() % 100) == 0) >> 177 { >> 178 sos_bochs_printf("[37myield(%c)[m\n", thr_arg->character); >> 179 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'Y'); >> 180 SOS_ASSERT_FATAL(SOS_OK == sos_thread_yield()); >> 181 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); >> 182 } >> 183 >> 184 /* Go to sleep some other times... */ >> 185 else if ((random() % 200) == 0) >> 186 { >> 187 struct sos_time t = (struct sos_time){ .sec=0, .nanosec=50000000 }; >> 188 sos_bochs_printf("[37msleep1(%c)[m\n", thr_arg->character); >> 189 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 's'); >> 190 SOS_ASSERT_FATAL(SOS_OK == sos_thread_sleep(& t)); >> 191 SOS_ASSERT_FATAL(sos_time_is_zero(& t)); >> 192 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); >> 193 } >> 194 >> 195 /* Go to sleep for a longer time some other times... */ >> 196 else if ((random() % 300) == 0) >> 197 { >> 198 struct sos_time t = (struct sos_time){ .sec=0, .nanosec=300000000 }; >> 199 sos_bochs_printf("[37msleep2(%c)[m\n", thr_arg->character); >> 200 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'S'); >> 201 SOS_ASSERT_FATAL(SOS_OK == sos_thread_sleep(& t)); >> 202 SOS_ASSERT_FATAL(sos_time_is_zero(& t)); >> 203 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); >> 204 } >> 205 >> 206 /* Infinite loop otherwise */ 118 } 207 } >> 208 } 119 209 120 sos_x86_videomem_printf(5, 0, !! 210 121 SOS_X86_VIDEO_FG_YEL !! 211 static void test_thread() 122 "Hello from the addr !! 212 { 123 sos_paging_get_paddr !! 213 /* "static" variables because we want them to remain even when the 124 !! 214 function returns */ 125 sos_x86_videomem_printf(6, 0, !! 215 static struct thr_arg arg_b, arg_c, arg_d, arg_e, arg_R, arg_S; 126 SOS_X86_VIDEO_FG_YEL !! 216 sos_ui32_t flags; 127 "Transfer vpage 0x%x !! 217 128 vpage_code, !! 218 sos_disable_IRQs(flags); 129 sos_paging_get_paddr !! 219 130 ppage_new, !! 220 arg_b = (struct thr_arg) { .character='b', .col=0, .row=21, .color=0x14 }; 131 (unsigned)vpage_tmp) !! 221 sos_create_kernel_thread("YO[b]", demo_thread, (void*)&arg_b, SOS_SCHED_PRIO_TS_LOWEST); 132 !! 222 133 /* Map the page somewhere (right after the k !! 223 arg_c = (struct thr_arg) { .character='c', .col=46, .row=21, .color=0x14 }; 134 to copy the code we are currently executi !! 224 sos_create_kernel_thread("YO[c]", demo_thread, (void*)&arg_c, SOS_SCHED_PRIO_TS_LOWEST); 135 sos_paging_map(ppage_new, vpage_tmp, !! 225 136 FALSE, !! 226 arg_d = (struct thr_arg) { .character='d', .col=0, .row=20, .color=0x14 }; 137 SOS_VM_MAP_ATOMIC !! 227 sos_create_kernel_thread("YO[d]", demo_thread, (void*)&arg_d, SOS_SCHED_PRIO_TS_LOWEST-1); 138 | SOS_VM_MAP_PROT_READ !! 228 139 | SOS_VM_MAP_PROT_WRITE); !! 229 arg_e = (struct thr_arg) { .character='e', .col=0, .row=19, .color=0x14 }; 140 !! 230 sos_create_kernel_thread("YO[e]", demo_thread, (void*)&arg_e, SOS_SCHED_PRIO_TS_LOWEST-2); 141 /* Ok, the new page is referenced by the map !! 231 142 reference to it */ !! 232 arg_R = (struct thr_arg) { .character='R', .col=0, .row=17, .color=0x1c }; 143 sos_physmem_unref_physpage(ppage_new); !! 233 sos_create_kernel_thread("YO[R]", demo_thread, (void*)&arg_R, SOS_SCHED_PRIO_RT_LOWEST); 144 !! 234 145 /* Copy the contents of the current page of !! 235 arg_S = (struct thr_arg) { .character='S', .col=0, .row=16, .color=0x1c }; 146 mapping */ !! 236 sos_create_kernel_thread("YO[S]", demo_thread, (void*)&arg_S, SOS_SCHED_PRIO_RT_LOWEST-1); 147 memcpy((void*)vpage_tmp, !! 237 148 (void*)vpage_code, !! 238 sos_restore_IRQs(flags); 149 SOS_PAGE_SIZE); !! 239 } 150 !! 240 151 /* Transfer the mapping of the current page !! 241 152 sos_paging_map(ppage_new, vpage_code, !! 242 /* ====================================================================== 153 FALSE, !! 243 * An operating system MUST always have a ready thread ! Otherwise: 154 SOS_VM_MAP_ATOMIC !! 244 * what would the CPU have to execute ?! 155 | SOS_VM_MAP_PROT_READ !! 245 */ 156 | SOS_VM_MAP_PROT_WRITE); !! 246 static void idle_thread() 157 !! 247 { 158 /* Ok, here we are: we have changed the phys !! 248 sos_ui32_t idle_twiddle = 0; 159 code we are executing ;). However, this n !! 249 160 virtual addresses: !! 250 while (1) 161 - vpage_tmp !! 251 { 162 - vpage_code !! 252 /* Remove this instruction if you get an "Invalid opcode" CPU 163 We can safely unmap it from sos_kernel_co !! 253 exception (old 80386 CPU) */ 164 still keeping the vpage_code mapping */ !! 254 asm("hlt\n"); 165 sos_paging_unmap(vpage_tmp); !! 255 166 !! 256 idle_twiddle ++; 167 sos_x86_videomem_printf(7, 0, !! 257 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 168 SOS_X86_VIDEO_FG_YEL !! 258 idle_twiddle); 169 "Hello from the addr !! 259 170 sos_paging_get_paddr !! 260 /* Lend the CPU to some other thread */ 171 !! 261 sos_thread_yield(); 172 sos_x86_videomem_printf(9, 0, !! 262 } 173 SOS_X86_VIDEO_FG_LTG !! 263 } 174 "Provoking a page fa !! 264 175 !! 265 176 /* !! 266 /* ====================================================================== 177 * Test 2: make sure the #PF handler works !! 267 * Kernel thread showing some CPU usage statistics on the console every 1s 178 */ !! 268 */ 179 !! 269 static void stat_thread() 180 /* Scan part of the kernel up to a page faul !! 270 { 181 should occur on the first page unmapped a !! 271 while (1) 182 which is exactly the page we temporarily << 183 (vpage_tmp) above to move the kernel code << 184 for (i = vpage_code ; /* none */ ; i += SOS_ << 185 { 272 { 186 unsigned *pint = (unsigned *)SOS_PAGE_AL !! 273 sos_ui32_t flags; 187 sos_bochs_printf("Test vaddr 0x%x : val= !! 274 sos_ui32_t load1, load5, load15; 188 sos_x86_videomem_printf(10, 0, !! 275 char str1[11], str5[11], str15[11]; >> 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 following computation */ >> 285 sos_load_get_sload(&load1, &load5, &load15); >> 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, 189 SOS_X86_VIDEO_FG 290 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 190 "Test vaddr 0x%x !! 291 "Kernel (- Idle): %s %s %s ", 191 (unsigned)pint); !! 292 str1, str5, str15); 192 sos_bochs_printf("0x%x\n", *pint); !! 293 193 sos_x86_videomem_printf(10, 30, !! 294 sos_load_get_uload(&load1, &load5, &load15); >> 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, 194 SOS_X86_VIDEO_FG 299 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 195 "0x%x " !! 300 "User: %s %s %s ", 196 } !! 301 str1, str5, str15); 197 302 198 /* BAD ! Did not get the page fault... */ !! 303 sos_load_get_uratio(&load1, &load5, &load15); 199 sos_x86_videomem_printf(20, 0, !! 304 sos_load_to_string(str1, load1); 200 SOS_X86_VIDEO_FG_LTR !! 305 sos_load_to_string(str5, load5); 201 "We should have had !! 306 sos_load_to_string(str15, load15); 202 vpage_tmp); !! 307 sos_x86_videomem_printf(18, 34, >> 308 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 309 "User CPU %%: %s %s %s ", >> 310 str1, str5, str15); >> 311 >> 312 /* The IDLE task is INcluded in the following computation */ >> 313 sos_load_get_sratio(&load1, &load5, &load15); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 319 "Kernel CPU %% (+ Idle): %s %s %s ", >> 320 str1, str5, str15); >> 321 sos_restore_IRQs(flags); >> 322 } 203 } 323 } 204 324 205 /* The C entry point of our operating system * !! 325 >> 326 /* ====================================================================== >> 327 * The C entry point of our operating system >> 328 */ 206 void sos_main(unsigned long magic, unsigned lo 329 void sos_main(unsigned long magic, unsigned long addr) 207 { 330 { 208 unsigned i; 331 unsigned i; 209 sos_paddr_t sos_kernel_core_base_paddr, sos_ 332 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; >> 333 struct sos_time tick_resolution; 210 334 211 /* Grub sends us a structure, called multibo 335 /* Grub sends us a structure, called multiboot_info_t with a lot of 212 precious informations about the system, s 336 precious informations about the system, see the multiboot 213 documentation for more information. */ 337 documentation for more information. */ 214 multiboot_info_t *mbi; 338 multiboot_info_t *mbi; 215 mbi = (multiboot_info_t *) addr; 339 mbi = (multiboot_info_t *) addr; 216 340 217 /* Setup bochs and console, and clear the co 341 /* Setup bochs and console, and clear the console */ 218 sos_bochs_setup(); 342 sos_bochs_setup(); 219 343 220 sos_x86_videomem_setup(); 344 sos_x86_videomem_setup(); 221 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 345 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 222 346 223 /* Greetings from SOS */ 347 /* Greetings from SOS */ 224 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 348 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 225 /* Loaded with Grub */ 349 /* Loaded with Grub */ 226 sos_x86_videomem_printf(1, 0, 350 sos_x86_videomem_printf(1, 0, 227 SOS_X86_VIDEO_FG_Y 351 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 228 "Welcome From GRUB 352 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 229 "SOS", ',', !! 353 "SOS article 7", ',', 230 (unsigned)(mbi->me 354 (unsigned)(mbi->mem_upper >> 10) + 1, 231 (unsigned)mbi->mem 355 (unsigned)mbi->mem_upper); 232 else 356 else 233 /* Not loaded with grub */ 357 /* Not loaded with grub */ 234 sos_x86_videomem_printf(1, 0, 358 sos_x86_videomem_printf(1, 0, 235 SOS_X86_VIDEO_FG_Y 359 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 236 "Welcome to SOS"); !! 360 "Welcome to SOS article 7"); 237 361 238 sos_bochs_putstring("Message in a bochs\n"); !! 362 sos_bochs_putstring("Message in a bochs: This is SOS article 7.\n"); 239 363 240 /* Setup CPU segmentation and IRQ subsystem 364 /* Setup CPU segmentation and IRQ subsystem */ 241 sos_gdt_setup(); !! 365 sos_gdt_subsystem_setup(); 242 sos_idt_setup(); !! 366 sos_idt_subsystem_setup(); 243 367 244 /* Setup SOS IRQs and exceptions subsystem * 368 /* Setup SOS IRQs and exceptions subsystem */ 245 sos_exceptions_setup(); !! 369 sos_exception_subsystem_setup(); 246 sos_irq_setup(); !! 370 sos_irq_subsystem_setup(); 247 371 248 /* Configure the timer so as to raise the IR 372 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 249 sos_i8254_set_frequency(100); 373 sos_i8254_set_frequency(100); 250 374 >> 375 /* Setup the kernel time subsystem to get prepared to take the timer >> 376 ticks into account */ >> 377 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; >> 378 sos_time_subsysem_setup(& tick_resolution); 251 379 252 /* We need a multiboot-compliant boot loader 380 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 253 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 381 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 254 { 382 { 255 sos_x86_videomem_putstring(20, 0, 383 sos_x86_videomem_putstring(20, 0, 256 SOS_X86_VIDEO 384 SOS_X86_VIDEO_FG_LTRED 257 | SOS_X86_V 385 | SOS_X86_VIDEO_BG_BLUE 258 | SOS_X86_V 386 | SOS_X86_VIDEO_FG_BLINKING, 259 "I'm not load 387 "I'm not loaded with Grub !"); 260 /* STOP ! */ 388 /* STOP ! */ 261 for (;;) 389 for (;;) 262 continue; 390 continue; 263 } 391 } 264 392 >> 393 /* >> 394 * Some interrupt handlers >> 395 */ >> 396 265 /* Binding some HW interrupts and exceptions 397 /* Binding some HW interrupts and exceptions to software routines */ 266 sos_irq_set_routine(SOS_IRQ_TIMER, 398 sos_irq_set_routine(SOS_IRQ_TIMER, 267 clk_it); !! 399 clk_it); 268 /* Enabling the HW interrupts here, this wil !! 400 269 interrupt call our clk_it handler */ !! 401 /* 270 asm volatile ("sti\n"); !! 402 * Setup physical memory management >> 403 */ >> 404 271 /* Multiboot says: "The value returned for u 405 /* Multiboot says: "The value returned for upper memory is maximally 272 the address of the first upper memory hol 406 the address of the first upper memory hole minus 1 megabyte.". It 273 also adds: "It is not guaranteed to be th 407 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 274 sos_physmem_setup((mbi->mem_upper<<10) + (1< !! 408 sos_physmem_subsystem_setup((mbi->mem_upper<<10) + (1<<20), 275 & sos_kernel_core_base_pad !! 409 & sos_kernel_core_base_paddr, 276 & sos_kernel_core_top_padd !! 410 & sos_kernel_core_top_paddr); 277 411 278 /* 412 /* 279 * Switch to paged-memory mode 413 * Switch to paged-memory mode 280 */ 414 */ 281 415 282 /* Disabling interrupts should seem more cor 416 /* Disabling interrupts should seem more correct, but it's not really 283 necessary at this stage */ 417 necessary at this stage */ 284 if (sos_paging_setup(sos_kernel_core_base_pa !! 418 SOS_ASSERT_FATAL(SOS_OK == 285 sos_kernel_core_top_pad !! 419 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 286 sos_bochs_printf("Could not setup paged me !! 420 sos_kernel_core_top_paddr)); 287 sos_x86_videomem_printf(2, 0, !! 421 288 SOS_X86_VIDEO_FG_YEL !! 422 /* Bind the page fault exception */ 289 "Paged-memory mode i !! 423 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 290 !! 424 pgflt_ex); 291 test_paging(sos_kernel_core_top_paddr); !! 425 292 !! 426 /* 293 /* An operatig system never ends */ !! 427 * Setup kernel virtual memory allocator 294 for (;;) !! 428 */ 295 continue; !! 429 >> 430 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, >> 431 sos_kernel_core_top_paddr, >> 432 bootstrap_stack_bottom, >> 433 bootstrap_stack_bottom >> 434 + bootstrap_stack_size)) >> 435 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); >> 436 >> 437 if (sos_kmalloc_subsystem_setup()) >> 438 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 296 439 297 return; !! 440 /* >> 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 interrupt handler >> 452 */ >> 453 sos_swintr_subsystem_setup(); >> 454 >> 455 >> 456 /* >> 457 * Initialize the Kernel thread and scheduler subsystems >> 458 */ >> 459 >> 460 /* Initialize kernel thread subsystem */ >> 461 sos_thread_subsystem_setup(bootstrap_stack_bottom, >> 462 bootstrap_stack_size); >> 463 >> 464 /* Initialize the scheduler */ >> 465 sos_sched_subsystem_setup(); >> 466 >> 467 /* Declare the IDLE thread */ >> 468 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, >> 469 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 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("stat_thread", stat_thread, >> 476 NULL, >> 477 SOS_SCHED_PRIO_TS_LOWEST) != NULL); >> 478 >> 479 >> 480 /* >> 481 * Initialize process stuff >> 482 */ >> 483 sos_process_subsystem_setup(); >> 484 >> 485 >> 486 /* Enabling the HW interrupts here, this will make the timer HW >> 487 interrupt call the scheduler */ >> 488 asm volatile ("sti\n"); >> 489 >> 490 /* Run some tests involving USER processes and threads */ >> 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, for there is already >> 501 * an idle Kernel thread ready to make the CPU busy working... >> 502 * >> 503 * However, we must EXPLICITELY call sos_thread_exit() because a >> 504 * simple "return" will return nowhere ! Actually this first thread >> 505 * was initialized by the Grub bootstrap stage, at a time when the >> 506 * word "thread" did not exist. This means that the stack was not >> 507 * setup in order for a return here to call sos_thread_exit() >> 508 * automagically. Hence we must call it manually. This is the ONLY >> 509 * kernel thread where we must do this manually. >> 510 */ >> 511 sos_bochs_printf("Bye from primary thread !\n"); >> 512 sos_thread_exit(); >> 513 SOS_FATAL_ERROR("No trespassing !"); 298 } 514 }
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