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001 /* Copyright (C) 2004 The SOS Team 001 /* Copyright (C) 2004 The SOS Team 002 002 003 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 007 007 008 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 011 GNU General Public License for more details. 012 012 013 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 016 USA. 017 */ 017 */ 018 018 019 #include <sos/errno.h> << 020 << 021 /* Include definitions of the multiboot standa 019 /* Include definitions of the multiboot standard */ 022 #include <bootstrap/multiboot.h> 020 #include <bootstrap/multiboot.h> 023 #include <hwcore/idt.h> 021 #include <hwcore/idt.h> 024 #include <hwcore/gdt.h> 022 #include <hwcore/gdt.h> 025 #include <hwcore/irq.h> 023 #include <hwcore/irq.h> 026 #include <hwcore/exception.h> 024 #include <hwcore/exception.h> 027 #include <hwcore/i8254.h> 025 #include <hwcore/i8254.h> 028 #include <sos/list.h> 026 #include <sos/list.h> 029 #include <sos/physmem.h> 027 #include <sos/physmem.h> 030 #include <hwcore/paging.h> 028 #include <hwcore/paging.h> 031 #include <hwcore/mm_context.h> << 032 #include <hwcore/swintr.h> << 033 #include <sos/kmem_vmm.h> 029 #include <sos/kmem_vmm.h> 034 #include <sos/kmalloc.h> 030 #include <sos/kmalloc.h> 035 #include <sos/time.h> 031 #include <sos/time.h> 036 #include <sos/thread.h> 032 #include <sos/thread.h> 037 #include <sos/process.h> << 038 #include <sos/umem_vmm.h> << 039 #include <sos/klibc.h> 033 #include <sos/klibc.h> 040 #include <sos/assert.h> 034 #include <sos/assert.h> 041 #include <drivers/x86_videomem.h> 035 #include <drivers/x86_videomem.h> 042 #include <drivers/bochs.h> 036 #include <drivers/bochs.h> 043 #include <sos/calcload.h> !! 037 044 #include <sos/umem_vmm.h> << 045 #include <sos/binfmt_elf32.h> << 046 #include <drivers/zero.h> << 047 #include <sos/fs.h> << 048 #include <drivers/fs_virtfs.h> << 049 #include <drivers/devices.h> << 050 #include <drivers/mem.h> << 051 #include <drivers/tty.h> << 052 #include <drivers/console.h> << 053 #include <drivers/serial.h> << 054 #include <sos/blkdev.h> << 055 #include <sos/fs_pagecache.h> << 056 #include <drivers/ide.h> << 057 038 058 /* Helper function to display each bits of a 3 039 /* Helper function to display each bits of a 32bits integer on the 059 screen as dark or light carrets */ 040 screen as dark or light carrets */ 060 void display_bits(unsigned char row, unsigned 041 void display_bits(unsigned char row, unsigned char col, 061 unsigned char attribute, 042 unsigned char attribute, 062 sos_ui32_t integer) 043 sos_ui32_t integer) 063 { 044 { 064 int i; 045 int i; 065 /* Scan each bit of the integer, MSb first * 046 /* Scan each bit of the integer, MSb first */ 066 for (i = 31 ; i >= 0 ; i--) 047 for (i = 31 ; i >= 0 ; i--) 067 { 048 { 068 /* Test if bit i of 'integer' is set */ 049 /* Test if bit i of 'integer' is set */ 069 int bit_i = (integer & (1 << i)); 050 int bit_i = (integer & (1 << i)); 070 /* Ascii 219 => dark carret, Ascii 177 = 051 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 071 unsigned char ascii_code = bit_i?219:177 052 unsigned char ascii_code = bit_i?219:177; 072 sos_x86_videomem_putchar(row, col++, 053 sos_x86_videomem_putchar(row, col++, 073 attribute, 054 attribute, 074 ascii_code); 055 ascii_code); 075 } 056 } 076 } 057 } 077 058 >> 059 078 /* Clock IRQ handler */ 060 /* Clock IRQ handler */ 079 static void clk_it(int intid) 061 static void clk_it(int intid) 080 { 062 { 081 static sos_ui32_t clock_count = 0; 063 static sos_ui32_t clock_count = 0; 082 064 083 display_bits(0, 48, 065 display_bits(0, 48, 084 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 066 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 085 clock_count); 067 clock_count); 086 clock_count++; 068 clock_count++; 087 069 088 /* Execute the expired timeout actions (if a 070 /* Execute the expired timeout actions (if any) */ 089 sos_time_do_tick(); 071 sos_time_do_tick(); 090 << 091 /* Update scheduler statistics and status */ << 092 sos_sched_do_timer_tick(); << 093 } 072 } 094 073 095 074 096 /* =========================================== 075 /* ====================================================================== 097 * Page fault exception handling 076 * Page fault exception handling 098 */ 077 */ 099 078 >> 079 /* Helper function to dump a backtrace on bochs and/or the console */ >> 080 static void dump_backtrace(const struct sos_cpu_state *cpu_state, >> 081 sos_vaddr_t stack_bottom, >> 082 sos_size_t stack_size, >> 083 sos_bool_t on_console, >> 084 sos_bool_t on_bochs) >> 085 { >> 086 static void backtracer(sos_vaddr_t PC, >> 087 sos_vaddr_t params, >> 088 sos_ui32_t depth, >> 089 void *custom_arg) >> 090 { >> 091 sos_ui32_t invalid = 0xffffffff, *arg1, *arg2, *arg3, *arg4; >> 092 >> 093 /* Get the address of the first 3 arguments from the >> 094 frame. Among these arguments, 0, 1, 2, 3 arguments might be >> 095 meaningful (depending on how many arguments the function may >> 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 arguments fit inside the >> 103 stack boundaries */ >> 104 #define INTERVAL_OK(b,v,u) ( ((b) <= (sos_vaddr_t)(v)) \ >> 105 && ((sos_vaddr_t)(v) < (u)) ) >> 106 if (!INTERVAL_OK(stack_bottom, arg1, stack_bottom + stack_size)) >> 107 arg1 = &invalid; >> 108 if (!INTERVAL_OK(stack_bottom, arg2, stack_bottom + stack_size)) >> 109 arg2 = &invalid; >> 110 if (!INTERVAL_OK(stack_bottom, arg3, stack_bottom + stack_size)) >> 111 arg3 = &invalid; >> 112 if (!INTERVAL_OK(stack_bottom, arg4, stack_bottom + stack_size)) >> 113 arg4 = &invalid; >> 114 >> 115 /* Print the function context for this frame */ >> 116 if (on_bochs) >> 117 sos_bochs_printf("[%d] PC=0x%x arg1=0x%x arg2=0x%x arg3=0x%x\n", >> 118 (unsigned)depth, (unsigned)PC, >> 119 (unsigned)*arg1, (unsigned)*arg2, >> 120 (unsigned)*arg3); >> 121 >> 122 if (on_console) >> 123 sos_x86_videomem_printf(23-depth, 3, >> 124 SOS_X86_VIDEO_BG_BLUE >> 125 | SOS_X86_VIDEO_FG_LTGREEN, >> 126 "[%d] PC=0x%x arg1=0x%x arg2=0x%x arg3=0x%x arg4=0x%x", >> 127 (unsigned)depth, PC, >> 128 (unsigned)*arg1, (unsigned)*arg2, >> 129 (unsigned)*arg3, (unsigned)*arg4); >> 130 >> 131 } >> 132 >> 133 sos_backtrace(cpu_state, 15, stack_bottom, stack_size, backtracer, NULL); >> 134 } >> 135 100 136 101 /* Page fault exception handler with demand pa 137 /* Page fault exception handler with demand paging for the kernel */ 102 static void pgflt_ex(int intid, struct sos_cpu !! 138 static void pgflt_ex(int intid, const struct sos_cpu_state *ctxt) 103 { 139 { 104 static sos_ui32_t demand_paging_count = 0; 140 static sos_ui32_t demand_paging_count = 0; 105 struct sos_thread * cur_thr = sos_thread_get !! 141 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 106 sos_vaddr_t faulting_vaddr = sos_cpu_contex << 107 sos_paddr_t ppage_paddr; 142 sos_paddr_t ppage_paddr; 108 143 109 if (sos_cpu_context_is_in_user_mode(ctxt) << 110 || (cur_thr->fixup_uaccess.return_vaddr) << 111 { << 112 __label__ unforce_address_space; << 113 sos_bool_t need_to_setup_mmu; << 114 sos_ui32_t errcode = sos_cpu_context_get << 115 << 116 /* Make sure to always stay in the inter << 117 configuration */ << 118 need_to_setup_mmu = (cur_thr->squatted_m << 119 != sos_process_get_ << 120 if (need_to_setup_mmu) << 121 sos_thread_prepare_user_space_access(N << 122 << 123 if (SOS_OK == << 124 sos_umem_vmm_try_resolve_page_fault( << 125 << 126 << 127 goto unforce_address_space; << 128 << 129 /* If the page fault occured in kernel m << 130 the fixup address */ << 131 if (! sos_cpu_context_is_in_user_mode(ct << 132 { << 133 cur_thr->fixup_uaccess.faulted_uaddr << 134 sos_cpu_context_set_EX_return_addres << 135 << 136 goto unforce_address_space; << 137 } << 138 << 139 if (need_to_setup_mmu) << 140 sos_thread_end_user_space_access(); << 141 << 142 sos_bochs_printf("\e[35mTHR %p: Unresolv << 143 (void*)sos_thread_get_c << 144 sos_cpu_context_get_PC( << 145 (unsigned)faulting_vadd << 146 (unsigned)sos_cpu_conte << 147 sos_bochs_printf("Terminating User threa << 148 sos_thread_exit(); << 149 << 150 unforce_address_space: << 151 if (need_to_setup_mmu) << 152 sos_thread_end_user_space_access(); << 153 return; << 154 } << 155 << 156 /* Check if address is covered by any VMM ra 144 /* Check if address is covered by any VMM range */ 157 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 145 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 158 { 146 { 159 /* No: The page fault is out of any kern 147 /* No: The page fault is out of any kernel virtual region. For 160 the moment, we don't handle this. */ 148 the moment, we don't handle this. */ >> 149 dump_backtrace(ctxt, >> 150 bootstrap_stack_bottom, >> 151 bootstrap_stack_size, >> 152 TRUE, TRUE); 161 sos_display_fatal_error("Unresolved page 153 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", 162 sos_cpu_context_ 154 sos_cpu_context_get_PC(ctxt), 163 (unsigned)faulti 155 (unsigned)faulting_vaddr, 164 (unsigned)sos_cp 156 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 165 SOS_ASSERT_FATAL(! "Got page fault (note 157 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 166 } 158 } 167 159 168 160 169 /* 161 /* 170 * Demand paging in kernel space !! 162 * Demand paging 171 */ 163 */ 172 164 173 /* Update the number of demand paging reques 165 /* Update the number of demand paging requests handled */ 174 demand_paging_count ++; 166 demand_paging_count ++; 175 display_bits(0, 0, 167 display_bits(0, 0, 176 SOS_X86_VIDEO_FG_LTRED | SOS_X8 168 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 177 demand_paging_count); 169 demand_paging_count); 178 170 179 /* Allocate a new page for the virtual addre 171 /* Allocate a new page for the virtual address */ 180 ppage_paddr = sos_physmem_ref_physpage_new(F 172 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 181 if (! ppage_paddr) 173 if (! ppage_paddr) 182 SOS_ASSERT_FATAL(! "TODO: implement swap. 174 SOS_ASSERT_FATAL(! "TODO: implement swap. (Out of mem in demand paging because no swap for kernel yet !)"); 183 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 175 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 184 SO 176 SOS_PAGE_ALIGN_INF(faulting_vaddr), 185 FA 177 FALSE, 186 SO 178 SOS_VM_MAP_PROT_READ 187 | 179 | SOS_VM_MAP_PROT_WRITE 188 | 180 | SOS_VM_MAP_ATOMIC)); 189 sos_physmem_unref_physpage(ppage_paddr); 181 sos_physmem_unref_physpage(ppage_paddr); 190 182 191 /* Ok, we can now return to interrupted cont 183 /* Ok, we can now return to interrupted context */ 192 } 184 } 193 185 194 186 195 << 196 /* =========================================== 187 /* ====================================================================== 197 * An operating system MUST always have a read !! 188 * Demonstrate the use of SOS kernel threads 198 * what would the CPU have to execute ?! !! 189 * - Kernel Threads are created with various priorities and their >> 190 * state is printed on both the console and the bochs' 0xe9 port >> 191 * - For tests regarding threads' synchronization, see mouse_sim.c 199 */ 192 */ 200 static void idle_thread(void* unused) __attrib << 201 static void idle_thread(void* unused) << 202 { << 203 sos_ui32_t idle_twiddle = 0; << 204 193 205 while (1) !! 194 struct thr_arg 206 { !! 195 { 207 /* Remove this instruction if you get an !! 196 char character; 208 exception (old 80386 CPU) */ !! 197 int color; 209 asm("hlt\n"); << 210 198 211 idle_twiddle ++; !! 199 int col; 212 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE !! 200 int row; 213 idle_twiddle); !! 201 }; 214 << 215 /* Lend the CPU to some other thread */ << 216 sos_thread_yield(); << 217 } << 218 } << 219 202 220 203 221 /* =========================================== !! 204 static void demo_thread(void *arg) 222 * Kernel thread showing some CPU usage statis << 223 */ << 224 #define LOAD_DISPLAY_BASELINE 4 << 225 #define LOAD_DISPLAY_STARTROW 34 << 226 static void stat_thread(void * unused) __attri << 227 static void stat_thread(void * unused) << 228 { 205 { >> 206 struct thr_arg *thr_arg = (struct thr_arg*)arg; >> 207 int progress = 0; >> 208 >> 209 sos_bochs_printf("start %c", thr_arg->character); 229 while (1) 210 while (1) 230 { 211 { 231 sos_ui32_t flags; !! 212 progress ++; 232 sos_ui32_t load1, load5, load15; !! 213 display_bits(thr_arg->row, thr_arg->col+1, thr_arg->color, progress); 233 char str1[11], str5[11], str15[11]; !! 214 234 struct sos_time t; !! 215 sos_bochs_putchar(thr_arg->character); 235 t.sec = 1; !! 216 236 t.nanosec = 0; !! 217 /* Yield the CPU to another thread sometimes... */ 237 !! 218 if ((random() % 100) == 0) 238 sos_thread_sleep(& t); !! 219 { 239 !! 220 sos_bochs_printf("[37myield(%c)[m\n", thr_arg->character); 240 sos_disable_IRQs(flags); !! 221 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'Y'); 241 !! 222 SOS_ASSERT_FATAL(SOS_OK == sos_thread_yield()); 242 /* The IDLE task is EXcluded in the foll !! 223 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); 243 sos_load_get_sload(&load1, &load5, &load !! 224 } 244 sos_load_to_string(str1, load1); !! 225 245 sos_load_to_string(str5, load5); !! 226 /* Go to sleep some other times... */ 246 sos_load_to_string(str15, load15); !! 227 else if ((random() % 200) == 0) 247 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 228 { 248 SOS_X86_VIDEO_FG !! 229 struct sos_time t = (struct sos_time){ .sec=0, .nanosec=50000000 }; 249 "Kernel (- Idle) !! 230 sos_bochs_printf("[37msleep1(%c)[m\n", thr_arg->character); 250 str1, str5, str1 !! 231 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 's'); 251 !! 232 SOS_ASSERT_FATAL(SOS_OK == sos_thread_sleep(& t)); 252 sos_load_get_uload(&load1, &load5, &load !! 233 SOS_ASSERT_FATAL(sos_time_is_zero(& t)); 253 sos_load_to_string(str1, load1); !! 234 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); 254 sos_load_to_string(str5, load5); !! 235 } 255 sos_load_to_string(str15, load15); !! 236 256 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 237 /* Go to sleep for a longer time some other times... */ 257 SOS_X86_VIDEO_FG !! 238 else if ((random() % 300) == 0) 258 "User: %s %s %s !! 239 { 259 str1, str5, str1 !! 240 struct sos_time t = (struct sos_time){ .sec=0, .nanosec=300000000 }; 260 !! 241 sos_bochs_printf("[37msleep2(%c)[m\n", thr_arg->character); 261 sos_load_get_uratio(&load1, &load5, &loa !! 242 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'S'); 262 sos_load_to_string(str1, load1); !! 243 SOS_ASSERT_FATAL(SOS_OK == sos_thread_sleep(& t)); 263 sos_load_to_string(str5, load5); !! 244 SOS_ASSERT_FATAL(sos_time_is_zero(& t)); 264 sos_load_to_string(str15, load15); !! 245 sos_x86_videomem_putchar(thr_arg->row, thr_arg->col, 0x1e, 'R'); 265 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 246 } 266 SOS_X86_VIDEO_FG !! 247 267 "User CPU %%: %s !! 248 /* Infinite loop otherwise */ 268 str1, str5, str1 << 269 << 270 /* The IDLE task is INcluded in the foll << 271 sos_load_get_sratio(&load1, &load5, &loa << 272 sos_load_to_string(str1, load1); << 273 sos_load_to_string(str5, load5); << 274 sos_load_to_string(str15, load15); << 275 sos_x86_videomem_printf(LOAD_DISPLAY_BAS << 276 SOS_X86_VIDEO_FG << 277 "Kernel CPU %% ( << 278 str1, str5, str1 << 279 sos_restore_IRQs(flags); << 280 } 249 } 281 } 250 } 282 251 283 252 284 /* =========================================== !! 253 static void test_thread() 285 * Start the "init" (userland) process << 286 */ << 287 static sos_ret_t << 288 start_init(struct sos_fs_manager_instance * ro << 289 { 254 { 290 sos_ret_t retval; !! 255 /* "static" variables because we want them to remain even when the 291 struct sos_umem_vmm_as *as_init; !! 256 function returns */ 292 struct sos_process *proc_init; !! 257 static struct thr_arg arg_b, arg_c, arg_d, arg_e, arg_R, arg_S; 293 struct sos_thread *new_thr; !! 258 sos_ui32_t flags; 294 sos_uaddr_t ustack, start_uaddr; << 295 struct sos_fs_opened_file * init_root, * ini << 296 << 297 /* Create the new process */ << 298 proc_init = sos_process_create("init", FALSE << 299 if (! proc_init) << 300 return -SOS_ENOMEM; << 301 as_init = sos_process_get_address_space(proc << 302 259 >> 260 sos_disable_IRQs(flags); 303 261 304 /* !! 262 arg_b = (struct thr_arg) { .character='b', .col=0, .row=21, .color=0x14 }; 305 * Setup the root and CWD directories of the !! 263 sos_create_kernel_thread("YO[b]", demo_thread, (void*)&arg_b); 306 * this process will correspond to the "glob << 307 * system since all the future processes wil << 308 */ << 309 retval = sos_fs_new_opened_file(proc_init, r << 310 SOS_FS_OPEN_ << 311 & init_root) << 312 if (SOS_OK != retval) << 313 { << 314 sos_process_unref(proc_init); << 315 return -SOS_ENOENT; << 316 } << 317 264 318 /* Duplicate the root file to set the curren !! 265 arg_c = (struct thr_arg) { .character='c', .col=46, .row=21, .color=0x14 }; 319 the init process */ !! 266 sos_create_kernel_thread("YO[c]", demo_thread, (void*)&arg_c); 320 retval = sos_fs_duplicate_opened_file(init_r << 321 & init << 322 if (SOS_OK != retval) << 323 { << 324 sos_fs_close(init_root); << 325 sos_process_unref(proc_init); << 326 return -SOS_ENOENT; << 327 } << 328 267 329 /* Now update the process ! */ !! 268 arg_d = (struct thr_arg) { .character='d', .col=0, .row=20, .color=0x14 }; 330 if ( ( SOS_OK != sos_process_chroot(proc_ini !! 269 sos_create_kernel_thread("YO[d]", demo_thread, (void*)&arg_d); 331 || ( SOS_OK != sos_process_chdir(proc_i << 332 { << 333 sos_fs_close(init_root); << 334 sos_fs_close(init_cwd); << 335 sos_process_chroot(proc_init, NULL, & un << 336 sos_process_chdir(proc_init, NULL, & unu << 337 sos_process_unref(proc_init); << 338 return -SOS_ENOENT; << 339 } << 340 270 >> 271 arg_e = (struct thr_arg) { .character='e', .col=0, .row=19, .color=0x14 }; >> 272 sos_create_kernel_thread("YO[e]", demo_thread, (void*)&arg_e); 341 273 >> 274 arg_R = (struct thr_arg) { .character='R', .col=0, .row=17, .color=0x1c }; >> 275 sos_create_kernel_thread("YO[R]", demo_thread, (void*)&arg_R); 342 276 343 /* Map the 'init' program in user space */ !! 277 arg_S = (struct thr_arg) { .character='S', .col=0, .row=16, .color=0x1c }; 344 start_uaddr = sos_binfmt_elf32_map(as_init, !! 278 sos_create_kernel_thread("YO[S]", demo_thread, (void*)&arg_S); 345 if (0 == start_uaddr) !! 279 346 { !! 280 sos_restore_IRQs(flags); 347 sos_process_unref(proc_init); !! 281 } 348 return -SOS_ENOENT; << 349 } << 350 282 351 /* Allocate the user stack */ << 352 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ << 353 retval = sos_dev_zero_map(as_init, &ustack, << 354 SOS_VM_MAP_PROT_RE << 355 /* PRIVATE */ 0); << 356 if (SOS_OK != retval) << 357 { << 358 sos_process_unref(proc_init); << 359 return -SOS_ENOMEM; << 360 } << 361 283 362 /* Now create the user thread */ !! 284 /* ====================================================================== 363 new_thr = sos_create_user_thread(NULL, !! 285 * An operating system MUST always have a ready thread ! Otherwise: 364 proc_init, !! 286 * what would the CPU have to execute ?! 365 start_uaddr !! 287 */ 366 0, 0, !! 288 static void idle_thread() 367 ustack + SO !! 289 { 368 SOS_SCHED_P !! 290 sos_ui32_t idle_twiddle = 0; 369 if (! new_thr) !! 291 >> 292 while (1) 370 { 293 { 371 sos_process_unref(proc_init); !! 294 /* Remove this instruction if you get an "Invalid opcode" CPU 372 return -SOS_ENOMEM; !! 295 exception (old 80386 CPU) */ 373 } !! 296 asm("hlt\n"); 374 297 375 sos_process_unref(proc_init); !! 298 idle_twiddle ++; 376 return SOS_OK; !! 299 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, >> 300 idle_twiddle); >> 301 >> 302 /* Lend the CPU to some other thread */ >> 303 sos_thread_yield(); >> 304 } 377 } 305 } 378 306 379 307 380 << 381 /* =========================================== 308 /* ====================================================================== 382 * The C entry point of our operating system 309 * The C entry point of our operating system 383 */ 310 */ 384 void sos_main(unsigned long magic, unsigned lo !! 311 void sos_main(unsigned long magic, unsigned long addr) 385 __attribute__((noreturn)); << 386 void sos_main(unsigned long magic, unsigned lo << 387 { 312 { >> 313 unsigned i; 388 sos_paddr_t sos_kernel_core_base_paddr, sos_ 314 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 389 struct sos_time tick_resolution; 315 struct sos_time tick_resolution; 390 struct sos_fs_manager_instance * rootfs; << 391 316 392 /* Size of RAM above 1MB. Might be undefined !! 317 /* Grub sends us a structure, called multiboot_info_t with a lot of 393 unsigned long int upper_mem = 0; !! 318 precious informations about the system, see the multiboot >> 319 documentation for more information. */ >> 320 multiboot_info_t *mbi; >> 321 mbi = (multiboot_info_t *) addr; 394 322 395 /* Setup bochs and console, and clear the co 323 /* Setup bochs and console, and clear the console */ 396 sos_bochs_subsystem_setup(); !! 324 sos_bochs_setup(); 397 325 398 sos_x86_videomem_setup(); 326 sos_x86_videomem_setup(); 399 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 327 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 400 328 401 /* Greetings from SOS */ 329 /* Greetings from SOS */ 402 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 330 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 403 { !! 331 /* Loaded with Grub */ 404 /* Grub sends us a structure, called mul !! 332 sos_x86_videomem_printf(1, 0, 405 precious informations about the syste !! 333 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 406 documentation for more information. * !! 334 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 407 multiboot_info_t *mbi = (multiboot_info_ !! 335 "SOS article 6.5", ',', 408 !! 336 (unsigned)(mbi->mem_upper >> 10) + 1, 409 /* Multiboot says: "The value returned f !! 337 (unsigned)mbi->mem_upper); 410 maximally the address of the first up << 411 megabyte.". It also adds: "It is not << 412 value." aka "YMMV" ;) */ << 413 upper_mem = mbi->mem_upper; << 414 sos_x86_videomem_printf(1, 0, << 415 SOS_X86_VIDEO_FG << 416 "Welcome From GR << 417 "SOS article 9.5 << 418 (unsigned)(upper << 419 (unsigned)upper_ << 420 } << 421 else if (magic == 0x42244224) << 422 { << 423 /* Loaded with SOS bootsect */ << 424 upper_mem = arg; << 425 sos_x86_videomem_printf(1, 0, << 426 SOS_X86_VIDEO_FG << 427 "Welcome to %s%c << 428 "SOS article 9.5 << 429 (unsigned)(upper << 430 (unsigned)upper_ << 431 } << 432 else 338 else 433 /* Not loaded with grub, not from an enhan !! 339 /* Not loaded with grub */ 434 sos_x86_videomem_printf(1, 0, 340 sos_x86_videomem_printf(1, 0, 435 SOS_X86_VIDEO_FG_Y 341 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 436 "Welcome to SOS ar !! 342 "Welcome to SOS article 6.5"); 437 343 438 sos_bochs_putstring("Message in a bochs: Thi !! 344 sos_bochs_putstring("Message in a bochs: This is SOS article 6.5.\n"); 439 345 440 /* Setup CPU segmentation and IRQ subsystem 346 /* Setup CPU segmentation and IRQ subsystem */ 441 sos_gdt_subsystem_setup(); 347 sos_gdt_subsystem_setup(); 442 sos_idt_subsystem_setup(); 348 sos_idt_subsystem_setup(); 443 349 444 /* Setup SOS IRQs and exceptions subsystem * 350 /* Setup SOS IRQs and exceptions subsystem */ 445 sos_exception_subsystem_setup(); 351 sos_exception_subsystem_setup(); 446 sos_irq_subsystem_setup(); 352 sos_irq_subsystem_setup(); 447 353 448 /* Configure the timer so as to raise the IR 354 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 449 sos_i8254_set_frequency(100); 355 sos_i8254_set_frequency(100); 450 356 451 /* Setup the kernel time subsystem to get pr 357 /* Setup the kernel time subsystem to get prepared to take the timer 452 ticks into account */ 358 ticks into account */ 453 tick_resolution = (struct sos_time) { .sec=0 359 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 454 sos_time_subsysem_setup(& tick_resolution); 360 sos_time_subsysem_setup(& tick_resolution); 455 361 456 /* We need to know the RAM size */ !! 362 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 457 if (upper_mem == 0) !! 363 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 458 { 364 { 459 sos_x86_videomem_putstring(20, 0, 365 sos_x86_videomem_putstring(20, 0, 460 SOS_X86_VIDEO 366 SOS_X86_VIDEO_FG_LTRED 461 | SOS_X86_V 367 | SOS_X86_VIDEO_BG_BLUE 462 | SOS_X86_V 368 | SOS_X86_VIDEO_FG_BLINKING, 463 "I don't know !! 369 "I'm not loaded with Grub !"); 464 /* STOP ! */ 370 /* STOP ! */ 465 for (;;) 371 for (;;) 466 continue; 372 continue; 467 } 373 } 468 374 469 /* 375 /* 470 * Some interrupt handlers 376 * Some interrupt handlers 471 */ 377 */ 472 378 473 /* Binding some HW interrupts and exceptions 379 /* Binding some HW interrupts and exceptions to software routines */ 474 sos_irq_set_routine(SOS_IRQ_TIMER, 380 sos_irq_set_routine(SOS_IRQ_TIMER, 475 clk_it); 381 clk_it); 476 382 477 /* 383 /* 478 * Setup physical memory management 384 * Setup physical memory management 479 */ 385 */ 480 386 481 SOS_ASSERT_FATAL(SOS_OK !! 387 /* Multiboot says: "The value returned for upper memory is maximally 482 == sos_physmem_subsystem_se !! 388 the address of the first upper memory hole minus 1 megabyte.". It 483 !! 389 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 484 !! 390 sos_physmem_subsystem_setup((mbi->mem_upper<<10) + (1<<20), >> 391 & sos_kernel_core_base_paddr, >> 392 & sos_kernel_core_top_paddr); 485 393 486 /* 394 /* 487 * Switch to paged-memory mode 395 * Switch to paged-memory mode 488 */ 396 */ 489 397 490 /* Disabling interrupts should seem more cor 398 /* Disabling interrupts should seem more correct, but it's not really 491 necessary at this stage */ 399 necessary at this stage */ 492 SOS_ASSERT_FATAL(SOS_OK == 400 SOS_ASSERT_FATAL(SOS_OK == 493 sos_paging_subsystem_setup( 401 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 494 402 sos_kernel_core_top_paddr)); 495 403 496 /* Bind the page fault exception */ 404 /* Bind the page fault exception */ 497 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 405 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 498 pgflt_ex); 406 pgflt_ex); 499 407 500 /* 408 /* 501 * Setup kernel virtual memory allocator 409 * Setup kernel virtual memory allocator 502 */ 410 */ 503 411 504 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 412 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 505 sos_kernel_ 413 sos_kernel_core_top_paddr, 506 bootstrap_s 414 bootstrap_stack_bottom, 507 bootstrap_s 415 bootstrap_stack_bottom 508 + bootstrap 416 + bootstrap_stack_size)) 509 sos_bochs_printf("Could not setup the Kern 417 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 510 418 511 if (sos_kmalloc_subsystem_setup()) 419 if (sos_kmalloc_subsystem_setup()) 512 sos_bochs_printf("Could not setup the Kmal 420 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 513 421 514 /* 422 /* 515 * Initialize the MMU context subsystem << 516 */ << 517 sos_mm_context_subsystem_setup(); << 518 << 519 /* << 520 * Initialize the CPU context subsystem << 521 */ << 522 sos_cpu_context_subsystem_setup(); << 523 << 524 /* << 525 * Bind the syscall handler to its software << 526 */ << 527 sos_swintr_subsystem_setup(); << 528 << 529 << 530 /* << 531 * Initialize the Kernel thread and schedule 423 * Initialize the Kernel thread and scheduler subsystems 532 */ 424 */ 533 425 534 /* Initialize kernel thread subsystem */ 426 /* Initialize kernel thread subsystem */ 535 sos_thread_subsystem_setup(bootstrap_stack_b 427 sos_thread_subsystem_setup(bootstrap_stack_bottom, 536 bootstrap_stack_s 428 bootstrap_stack_size); 537 429 538 /* Initialize the scheduler */ 430 /* Initialize the scheduler */ 539 sos_sched_subsystem_setup(); 431 sos_sched_subsystem_setup(); 540 432 541 /* Declare the IDLE thread */ 433 /* Declare the IDLE thread */ 542 SOS_ASSERT_FATAL(sos_create_kernel_thread("i !! 434 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL) != NULL); 543 SO << 544 << 545 /* Prepare the stats subsystem */ << 546 sos_load_subsystem_setup(); << 547 << 548 /* Declare a thread that prints some stats * << 549 SOS_ASSERT_FATAL(sos_create_kernel_thread("s << 550 NU << 551 SO << 552 << 553 << 554 /* << 555 * Initialise user address space management << 556 */ << 557 sos_umem_vmm_subsystem_setup(); << 558 sos_dev_zero_subsystem_setup(); << 559 << 560 /* Initialize the page and block cache subsy << 561 sos_fs_pagecache_subsystem_setup(); << 562 sos_blockdev_subsystem_setup(); << 563 sos_dev_mem_chardev_setup(); << 564 << 565 /* << 566 * Initialize process stuff << 567 */ << 568 sos_process_subsystem_setup(); << 569 << 570 435 571 /* Enabling the HW interrupts here, this wil 436 /* Enabling the HW interrupts here, this will make the timer HW 572 interrupt call the scheduler */ 437 interrupt call the scheduler */ 573 asm volatile ("sti\n"); 438 asm volatile ("sti\n"); 574 439 575 440 576 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_sub !! 441 /* Now run some Kernel threads just for fun ! */ 577 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_ !! 442 extern void MouseSim(); 578 !! 443 MouseSim(); 579 !! 444 test_thread(); 580 << 581 << 582 << 583 tty_subsystem_setup(); << 584 sos_ttyS0_subsystem_setup(); << 585 sos_console_subsystem_setup(); << 586 << 587 << 588 sos_ide_subsystem_setup(); << 589 << 590 << 591 445 592 /* Start the 'init' process, which in turns << 593 programs */ << 594 start_init(rootfs); << 595 /* 446 /* 596 * We can safely exit from this function now 447 * We can safely exit from this function now, for there is already 597 * an idle Kernel thread ready to make the C 448 * an idle Kernel thread ready to make the CPU busy working... 598 * 449 * 599 * However, we must EXPLICITELY call sos_thr 450 * However, we must EXPLICITELY call sos_thread_exit() because a 600 * simple "return" will return nowhere ! Act 451 * simple "return" will return nowhere ! Actually this first thread 601 * was initialized by the Grub bootstrap sta 452 * was initialized by the Grub bootstrap stage, at a time when the 602 * word "thread" did not exist. This means t 453 * word "thread" did not exist. This means that the stack was not 603 * setup in order for a return here to call 454 * setup in order for a return here to call sos_thread_exit() 604 * automagically. Hence we must call it manu 455 * automagically. Hence we must call it manually. This is the ONLY 605 * kernel thread where we must do this manua 456 * kernel thread where we must do this manually. 606 */ 457 */ 607 sos_bochs_printf("Bye from primary thread !\ 458 sos_bochs_printf("Bye from primary thread !\n"); 608 sos_thread_exit(); 459 sos_thread_exit(); 609 SOS_FATAL_ERROR("No trespassing !"); 460 SOS_FATAL_ERROR("No trespassing !"); 610 } 461 }
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