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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> 029 #include <hwcore/mm_context.h> 032 #include <hwcore/swintr.h> 030 #include <hwcore/swintr.h> 033 #include <sos/kmem_vmm.h> 031 #include <sos/kmem_vmm.h> 034 #include <sos/kmalloc.h> 032 #include <sos/kmalloc.h> 035 #include <sos/time.h> 033 #include <sos/time.h> 036 #include <sos/thread.h> 034 #include <sos/thread.h> 037 #include <sos/process.h> 035 #include <sos/process.h> 038 #include <sos/umem_vmm.h> << 039 #include <sos/klibc.h> 036 #include <sos/klibc.h> 040 #include <sos/assert.h> 037 #include <sos/assert.h> 041 #include <drivers/x86_videomem.h> 038 #include <drivers/x86_videomem.h> 042 #include <drivers/bochs.h> 039 #include <drivers/bochs.h> 043 #include <sos/calcload.h> 040 #include <sos/calcload.h> 044 #include <sos/umem_vmm.h> !! 041 045 #include <sos/binfmt_elf32.h> << 046 #include <drivers/zero.h> << 047 #include <sos/fs.h> << 048 #include <drivers/fs_virtfs.h> << 049 042 050 /* Helper function to display each bits of a 3 043 /* Helper function to display each bits of a 32bits integer on the 051 screen as dark or light carrets */ 044 screen as dark or light carrets */ 052 void display_bits(unsigned char row, unsigned 045 void display_bits(unsigned char row, unsigned char col, 053 unsigned char attribute, 046 unsigned char attribute, 054 sos_ui32_t integer) 047 sos_ui32_t integer) 055 { 048 { 056 int i; 049 int i; 057 /* Scan each bit of the integer, MSb first * 050 /* Scan each bit of the integer, MSb first */ 058 for (i = 31 ; i >= 0 ; i--) 051 for (i = 31 ; i >= 0 ; i--) 059 { 052 { 060 /* Test if bit i of 'integer' is set */ 053 /* Test if bit i of 'integer' is set */ 061 int bit_i = (integer & (1 << i)); 054 int bit_i = (integer & (1 << i)); 062 /* Ascii 219 => dark carret, Ascii 177 = 055 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 063 unsigned char ascii_code = bit_i?219:177 056 unsigned char ascii_code = bit_i?219:177; 064 sos_x86_videomem_putchar(row, col++, 057 sos_x86_videomem_putchar(row, col++, 065 attribute, 058 attribute, 066 ascii_code); 059 ascii_code); 067 } 060 } 068 } 061 } 069 062 >> 063 070 /* Clock IRQ handler */ 064 /* Clock IRQ handler */ 071 static void clk_it(int intid) 065 static void clk_it(int intid) 072 { 066 { 073 static sos_ui32_t clock_count = 0; 067 static sos_ui32_t clock_count = 0; 074 068 075 display_bits(0, 48, 069 display_bits(0, 48, 076 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 070 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 077 clock_count); 071 clock_count); 078 clock_count++; 072 clock_count++; 079 073 080 /* Execute the expired timeout actions (if a 074 /* Execute the expired timeout actions (if any) */ 081 sos_time_do_tick(); 075 sos_time_do_tick(); 082 076 083 /* Update scheduler statistics and status */ 077 /* Update scheduler statistics and status */ 084 sos_sched_do_timer_tick(); 078 sos_sched_do_timer_tick(); 085 } 079 } 086 080 087 081 088 /* =========================================== 082 /* ====================================================================== 089 * Page fault exception handling 083 * Page fault exception handling 090 */ 084 */ 091 085 092 086 093 /* Page fault exception handler with demand pa 087 /* Page fault exception handler with demand paging for the kernel */ 094 static void pgflt_ex(int intid, struct sos_cpu 088 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 095 { 089 { 096 static sos_ui32_t demand_paging_count = 0; 090 static sos_ui32_t demand_paging_count = 0; 097 struct sos_thread * cur_thr = sos_thread_get << 098 sos_vaddr_t faulting_vaddr = sos_cpu_contex 091 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 099 sos_paddr_t ppage_paddr; 092 sos_paddr_t ppage_paddr; 100 093 101 if (sos_cpu_context_is_in_user_mode(ctxt) !! 094 if (sos_cpu_context_is_in_user_mode(ctxt)) 102 || (cur_thr->fixup_uaccess.return_vaddr) << 103 { 095 { 104 __label__ unforce_address_space; !! 096 /* User-mode page faults are considered unresolved for the 105 sos_bool_t need_to_setup_mmu; !! 097 moment */ 106 sos_ui32_t errcode = sos_cpu_context_get << 107 << 108 /* Make sure to always stay in the inter << 109 configuration */ << 110 need_to_setup_mmu = (cur_thr->squatted_m << 111 != sos_process_get_ << 112 if (need_to_setup_mmu) << 113 sos_thread_prepare_user_space_access(N << 114 << 115 if (SOS_OK == << 116 sos_umem_vmm_try_resolve_page_fault( << 117 << 118 << 119 goto unforce_address_space; << 120 << 121 /* If the page fault occured in kernel m << 122 the fixup address */ << 123 if (! sos_cpu_context_is_in_user_mode(ct << 124 { << 125 cur_thr->fixup_uaccess.faulted_uaddr << 126 sos_cpu_context_set_EX_return_addres << 127 << 128 goto unforce_address_space; << 129 } << 130 << 131 if (need_to_setup_mmu) << 132 sos_thread_end_user_space_access(); << 133 << 134 sos_bochs_printf("Unresolved USER page F 098 sos_bochs_printf("Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\n", 135 sos_cpu_context_get_PC( 099 sos_cpu_context_get_PC(ctxt), 136 (unsigned)faulting_vadd 100 (unsigned)faulting_vaddr, 137 (unsigned)sos_cpu_conte 101 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 138 sos_bochs_printf("Terminating User threa 102 sos_bochs_printf("Terminating User thread\n"); 139 sos_thread_exit(); 103 sos_thread_exit(); 140 << 141 unforce_address_space: << 142 if (need_to_setup_mmu) << 143 sos_thread_end_user_space_access(); << 144 return; << 145 } 104 } 146 105 147 /* Check if address is covered by any VMM ra 106 /* Check if address is covered by any VMM range */ 148 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 107 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 149 { 108 { 150 /* No: The page fault is out of any kern 109 /* No: The page fault is out of any kernel virtual region. For 151 the moment, we don't handle this. */ 110 the moment, we don't handle this. */ 152 sos_display_fatal_error("Unresolved page 111 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", 153 sos_cpu_context_ 112 sos_cpu_context_get_PC(ctxt), 154 (unsigned)faulti 113 (unsigned)faulting_vaddr, 155 (unsigned)sos_cp 114 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 156 SOS_ASSERT_FATAL(! "Got page fault (note 115 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 157 } 116 } 158 117 159 118 160 /* 119 /* 161 * Demand paging in kernel space 120 * Demand paging in kernel space 162 */ 121 */ 163 122 164 /* Update the number of demand paging reques 123 /* Update the number of demand paging requests handled */ 165 demand_paging_count ++; 124 demand_paging_count ++; 166 display_bits(0, 0, 125 display_bits(0, 0, 167 SOS_X86_VIDEO_FG_LTRED | SOS_X8 126 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 168 demand_paging_count); 127 demand_paging_count); 169 128 170 /* Allocate a new page for the virtual addre 129 /* Allocate a new page for the virtual address */ 171 ppage_paddr = sos_physmem_ref_physpage_new(F 130 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 172 if (! ppage_paddr) 131 if (! ppage_paddr) 173 SOS_ASSERT_FATAL(! "TODO: implement swap. 132 SOS_ASSERT_FATAL(! "TODO: implement swap. (Out of mem in demand paging because no swap for kernel yet !)"); 174 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 133 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 175 SO 134 SOS_PAGE_ALIGN_INF(faulting_vaddr), 176 FA 135 FALSE, 177 SO 136 SOS_VM_MAP_PROT_READ 178 | 137 | SOS_VM_MAP_PROT_WRITE 179 | 138 | SOS_VM_MAP_ATOMIC)); 180 sos_physmem_unref_physpage(ppage_paddr); 139 sos_physmem_unref_physpage(ppage_paddr); 181 140 182 /* Ok, we can now return to interrupted cont 141 /* Ok, we can now return to interrupted context */ 183 } 142 } 184 143 185 144 >> 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 >> 161 >> 162 static void demo_thread(void *arg) >> 163 { >> 164 struct thr_arg *thr_arg = (struct thr_arg*)arg; >> 165 int progress = 0; >> 166 >> 167 sos_bochs_printf("start %c", thr_arg->character); >> 168 while (1) >> 169 { >> 170 progress ++; >> 171 display_bits(thr_arg->row, thr_arg->col+1, thr_arg->color, progress); >> 172 >> 173 sos_bochs_putchar(thr_arg->character); >> 174 >> 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 */ >> 207 } >> 208 } >> 209 >> 210 >> 211 static void test_thread() >> 212 { >> 213 /* "static" variables because we want them to remain even when the >> 214 function returns */ >> 215 static struct thr_arg arg_b, arg_c, arg_d, arg_e, arg_R, arg_S; >> 216 sos_ui32_t flags; >> 217 >> 218 sos_disable_IRQs(flags); >> 219 >> 220 arg_b = (struct thr_arg) { .character='b', .col=0, .row=21, .color=0x14 }; >> 221 sos_create_kernel_thread("YO[b]", demo_thread, (void*)&arg_b, SOS_SCHED_PRIO_TS_LOWEST); >> 222 >> 223 arg_c = (struct thr_arg) { .character='c', .col=46, .row=21, .color=0x14 }; >> 224 sos_create_kernel_thread("YO[c]", demo_thread, (void*)&arg_c, SOS_SCHED_PRIO_TS_LOWEST); >> 225 >> 226 arg_d = (struct thr_arg) { .character='d', .col=0, .row=20, .color=0x14 }; >> 227 sos_create_kernel_thread("YO[d]", demo_thread, (void*)&arg_d, SOS_SCHED_PRIO_TS_LOWEST-1); >> 228 >> 229 arg_e = (struct thr_arg) { .character='e', .col=0, .row=19, .color=0x14 }; >> 230 sos_create_kernel_thread("YO[e]", demo_thread, (void*)&arg_e, SOS_SCHED_PRIO_TS_LOWEST-2); >> 231 >> 232 arg_R = (struct thr_arg) { .character='R', .col=0, .row=17, .color=0x1c }; >> 233 sos_create_kernel_thread("YO[R]", demo_thread, (void*)&arg_R, SOS_SCHED_PRIO_RT_LOWEST); >> 234 >> 235 arg_S = (struct thr_arg) { .character='S', .col=0, .row=16, .color=0x1c }; >> 236 sos_create_kernel_thread("YO[S]", demo_thread, (void*)&arg_S, SOS_SCHED_PRIO_RT_LOWEST-1); >> 237 >> 238 sos_restore_IRQs(flags); >> 239 } >> 240 186 241 187 /* =========================================== 242 /* ====================================================================== 188 * An operating system MUST always have a read 243 * An operating system MUST always have a ready thread ! Otherwise: 189 * what would the CPU have to execute ?! 244 * what would the CPU have to execute ?! 190 */ 245 */ 191 static void idle_thread() 246 static void idle_thread() 192 { 247 { 193 sos_ui32_t idle_twiddle = 0; 248 sos_ui32_t idle_twiddle = 0; 194 249 195 while (1) 250 while (1) 196 { 251 { 197 /* Remove this instruction if you get an 252 /* Remove this instruction if you get an "Invalid opcode" CPU 198 exception (old 80386 CPU) */ 253 exception (old 80386 CPU) */ 199 asm("hlt\n"); 254 asm("hlt\n"); 200 255 201 idle_twiddle ++; 256 idle_twiddle ++; 202 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE 257 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 203 idle_twiddle); 258 idle_twiddle); 204 259 205 /* Lend the CPU to some other thread */ 260 /* Lend the CPU to some other thread */ 206 sos_thread_yield(); 261 sos_thread_yield(); 207 } 262 } 208 } 263 } 209 264 210 265 211 /* =========================================== 266 /* ====================================================================== 212 * Kernel thread showing some CPU usage statis 267 * Kernel thread showing some CPU usage statistics on the console every 1s 213 */ 268 */ 214 static void stat_thread() 269 static void stat_thread() 215 { 270 { 216 while (1) 271 while (1) 217 { 272 { 218 sos_ui32_t flags; 273 sos_ui32_t flags; 219 sos_ui32_t load1, load5, load15; 274 sos_ui32_t load1, load5, load15; 220 char str1[11], str5[11], str15[11]; 275 char str1[11], str5[11], str15[11]; 221 struct sos_time t; 276 struct sos_time t; 222 t.sec = 1; 277 t.sec = 1; 223 t.nanosec = 0; 278 t.nanosec = 0; 224 279 225 sos_thread_sleep(& t); 280 sos_thread_sleep(& t); 226 281 227 sos_disable_IRQs(flags); 282 sos_disable_IRQs(flags); 228 283 229 /* The IDLE task is EXcluded in the foll 284 /* The IDLE task is EXcluded in the following computation */ 230 sos_load_get_sload(&load1, &load5, &load 285 sos_load_get_sload(&load1, &load5, &load15); 231 sos_load_to_string(str1, load1); 286 sos_load_to_string(str1, load1); 232 sos_load_to_string(str5, load5); 287 sos_load_to_string(str5, load5); 233 sos_load_to_string(str15, load15); 288 sos_load_to_string(str15, load15); 234 sos_x86_videomem_printf(16, 34, 289 sos_x86_videomem_printf(16, 34, 235 SOS_X86_VIDEO_FG 290 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 236 "Kernel (- Idle) 291 "Kernel (- Idle): %s %s %s ", 237 str1, str5, str1 292 str1, str5, str15); 238 293 239 sos_load_get_uload(&load1, &load5, &load 294 sos_load_get_uload(&load1, &load5, &load15); 240 sos_load_to_string(str1, load1); 295 sos_load_to_string(str1, load1); 241 sos_load_to_string(str5, load5); 296 sos_load_to_string(str5, load5); 242 sos_load_to_string(str15, load15); 297 sos_load_to_string(str15, load15); 243 sos_x86_videomem_printf(17, 34, 298 sos_x86_videomem_printf(17, 34, 244 SOS_X86_VIDEO_FG 299 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 245 "User: %s %s %s 300 "User: %s %s %s ", 246 str1, str5, str1 301 str1, str5, str15); 247 302 248 sos_load_get_uratio(&load1, &load5, &loa 303 sos_load_get_uratio(&load1, &load5, &load15); 249 sos_load_to_string(str1, load1); 304 sos_load_to_string(str1, load1); 250 sos_load_to_string(str5, load5); 305 sos_load_to_string(str5, load5); 251 sos_load_to_string(str15, load15); 306 sos_load_to_string(str15, load15); 252 sos_x86_videomem_printf(18, 34, 307 sos_x86_videomem_printf(18, 34, 253 SOS_X86_VIDEO_FG 308 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 254 "User CPU %%: %s 309 "User CPU %%: %s %s %s ", 255 str1, str5, str1 310 str1, str5, str15); 256 311 257 /* The IDLE task is INcluded in the foll 312 /* The IDLE task is INcluded in the following computation */ 258 sos_load_get_sratio(&load1, &load5, &loa 313 sos_load_get_sratio(&load1, &load5, &load15); 259 sos_load_to_string(str1, load1); 314 sos_load_to_string(str1, load1); 260 sos_load_to_string(str5, load5); 315 sos_load_to_string(str5, load5); 261 sos_load_to_string(str15, load15); 316 sos_load_to_string(str15, load15); 262 sos_x86_videomem_printf(19, 34, 317 sos_x86_videomem_printf(19, 34, 263 SOS_X86_VIDEO_FG 318 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 264 "Kernel CPU %% ( 319 "Kernel CPU %% (+ Idle): %s %s %s ", 265 str1, str5, str1 320 str1, str5, str15); 266 sos_restore_IRQs(flags); 321 sos_restore_IRQs(flags); 267 } 322 } 268 } 323 } 269 324 270 325 271 /* =========================================== 326 /* ====================================================================== 272 * Start the "init" (userland) process << 273 */ << 274 static sos_ret_t << 275 start_init(struct sos_fs_manager_instance * ro << 276 { << 277 sos_ret_t retval; << 278 struct sos_umem_vmm_as *as_init; << 279 struct sos_process *proc_init; << 280 struct sos_thread *new_thr; << 281 sos_uaddr_t ustack, start_uaddr; << 282 struct sos_fs_opened_file * init_root, * ini << 283 << 284 /* Create the new process */ << 285 proc_init = sos_process_create("init", FALSE << 286 if (! proc_init) << 287 return -SOS_ENOMEM; << 288 as_init = sos_process_get_address_space(proc << 289 << 290 << 291 /* << 292 * Setup the root and CWD directories of the << 293 * this process will correspond to the "glob << 294 * system since all the future processes wil << 295 */ << 296 retval = sos_fs_new_opened_file(proc_init, r << 297 SOS_FS_OPEN_ << 298 & init_root) << 299 if (SOS_OK != retval) << 300 { << 301 sos_process_unref(proc_init); << 302 return -SOS_ENOENT; << 303 } << 304 << 305 /* Duplicate the root file to set the curren << 306 the init process */ << 307 retval = sos_fs_duplicate_opened_file(init_r << 308 & init << 309 if (SOS_OK != retval) << 310 { << 311 sos_fs_close(init_root); << 312 sos_process_unref(proc_init); << 313 return -SOS_ENOENT; << 314 } << 315 << 316 /* Now update the process ! */ << 317 if ( ( SOS_OK != sos_process_chroot(proc_ini << 318 || ( SOS_OK != sos_process_chdir(proc_i << 319 { << 320 sos_fs_close(init_root); << 321 sos_fs_close(init_cwd); << 322 sos_process_chroot(proc_init, NULL, & un << 323 sos_process_chdir(proc_init, NULL, & unu << 324 sos_process_unref(proc_init); << 325 return -SOS_ENOENT; << 326 } << 327 << 328 /* Map the 'init' program in user space */ << 329 start_uaddr = sos_binfmt_elf32_map(as_init, << 330 if (0 == start_uaddr) << 331 { << 332 sos_process_unref(proc_init); << 333 return -SOS_ENOENT; << 334 } << 335 << 336 /* Allocate the user stack */ << 337 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ << 338 retval = sos_dev_zero_map(as_init, &ustack, << 339 SOS_VM_MAP_PROT_RE << 340 /* PRIVATE */ 0); << 341 if (SOS_OK != retval) << 342 { << 343 sos_process_unref(proc_init); << 344 return -SOS_ENOMEM; << 345 } << 346 << 347 /* Now create the user thread */ << 348 new_thr = sos_create_user_thread(NULL, << 349 proc_init, << 350 start_uaddr << 351 0, 0, << 352 ustack + SO << 353 SOS_SCHED_P << 354 if (! new_thr) << 355 { << 356 sos_process_unref(proc_init); << 357 return -SOS_ENOMEM; << 358 } << 359 << 360 sos_process_unref(proc_init); << 361 return SOS_OK; << 362 } << 363 << 364 << 365 /* =========================================== << 366 * The C entry point of our operating system 327 * The C entry point of our operating system 367 */ 328 */ 368 void sos_main(unsigned long magic, unsigned lo !! 329 void sos_main(unsigned long magic, unsigned long addr) 369 { 330 { 370 unsigned i; 331 unsigned i; 371 sos_paddr_t sos_kernel_core_base_paddr, sos_ 332 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 372 struct sos_time tick_resolution; 333 struct sos_time tick_resolution; 373 struct sos_fs_manager_instance * rootfs; << 374 334 375 /* Size of RAM above 1MB. Might be undefined !! 335 /* Grub sends us a structure, called multiboot_info_t with a lot of 376 unsigned long int upper_mem = 0; !! 336 precious informations about the system, see the multiboot >> 337 documentation for more information. */ >> 338 multiboot_info_t *mbi; >> 339 mbi = (multiboot_info_t *) addr; 377 340 378 /* Setup bochs and console, and clear the co 341 /* Setup bochs and console, and clear the console */ 379 sos_bochs_setup(); 342 sos_bochs_setup(); 380 343 381 sos_x86_videomem_setup(); 344 sos_x86_videomem_setup(); 382 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 345 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 383 346 384 /* Greetings from SOS */ 347 /* Greetings from SOS */ 385 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 348 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 386 { !! 349 /* Loaded with Grub */ 387 /* Grub sends us a structure, called mul !! 350 sos_x86_videomem_printf(1, 0, 388 precious informations about the syste !! 351 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 389 documentation for more information. * !! 352 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 390 multiboot_info_t *mbi = (multiboot_info_ !! 353 "SOS article 7", ',', 391 !! 354 (unsigned)(mbi->mem_upper >> 10) + 1, 392 /* Multiboot says: "The value returned f !! 355 (unsigned)mbi->mem_upper); 393 maximally the address of the first up << 394 megabyte.". It also adds: "It is not << 395 value." aka "YMMV" ;) */ << 396 upper_mem = mbi->mem_upper; << 397 sos_x86_videomem_printf(1, 0, << 398 SOS_X86_VIDEO_FG << 399 "Welcome From GR << 400 "SOS article 8", << 401 (unsigned)(upper << 402 (unsigned)upper_ << 403 } << 404 else if (magic == 0x42244224) << 405 { << 406 /* Loaded with SOS bootsect */ << 407 upper_mem = arg; << 408 sos_x86_videomem_printf(1, 0, << 409 SOS_X86_VIDEO_FG << 410 "Welcome to %s%c << 411 "SOS article 8", << 412 (unsigned)(upper << 413 (unsigned)upper_ << 414 } << 415 else 356 else 416 /* Not loaded with grub, not from an enhan !! 357 /* Not loaded with grub */ 417 sos_x86_videomem_printf(1, 0, 358 sos_x86_videomem_printf(1, 0, 418 SOS_X86_VIDEO_FG_Y 359 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 419 "Welcome to SOS ar !! 360 "Welcome to SOS article 7"); 420 361 421 sos_bochs_putstring("Message in a bochs: Thi !! 362 sos_bochs_putstring("Message in a bochs: This is SOS article 7.\n"); 422 363 423 /* Setup CPU segmentation and IRQ subsystem 364 /* Setup CPU segmentation and IRQ subsystem */ 424 sos_gdt_subsystem_setup(); 365 sos_gdt_subsystem_setup(); 425 sos_idt_subsystem_setup(); 366 sos_idt_subsystem_setup(); 426 367 427 /* Setup SOS IRQs and exceptions subsystem * 368 /* Setup SOS IRQs and exceptions subsystem */ 428 sos_exception_subsystem_setup(); 369 sos_exception_subsystem_setup(); 429 sos_irq_subsystem_setup(); 370 sos_irq_subsystem_setup(); 430 371 431 /* Configure the timer so as to raise the IR 372 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 432 sos_i8254_set_frequency(100); 373 sos_i8254_set_frequency(100); 433 374 434 /* Setup the kernel time subsystem to get pr 375 /* Setup the kernel time subsystem to get prepared to take the timer 435 ticks into account */ 376 ticks into account */ 436 tick_resolution = (struct sos_time) { .sec=0 377 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 437 sos_time_subsysem_setup(& tick_resolution); 378 sos_time_subsysem_setup(& tick_resolution); 438 379 439 /* We need to know the RAM size */ !! 380 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 440 if (upper_mem == 0) !! 381 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 441 { 382 { 442 sos_x86_videomem_putstring(20, 0, 383 sos_x86_videomem_putstring(20, 0, 443 SOS_X86_VIDEO 384 SOS_X86_VIDEO_FG_LTRED 444 | SOS_X86_V 385 | SOS_X86_VIDEO_BG_BLUE 445 | SOS_X86_V 386 | SOS_X86_VIDEO_FG_BLINKING, 446 "I don't know !! 387 "I'm not loaded with Grub !"); 447 /* STOP ! */ 388 /* STOP ! */ 448 for (;;) 389 for (;;) 449 continue; 390 continue; 450 } 391 } 451 392 452 /* 393 /* 453 * Some interrupt handlers 394 * Some interrupt handlers 454 */ 395 */ 455 396 456 /* Binding some HW interrupts and exceptions 397 /* Binding some HW interrupts and exceptions to software routines */ 457 sos_irq_set_routine(SOS_IRQ_TIMER, 398 sos_irq_set_routine(SOS_IRQ_TIMER, 458 clk_it); 399 clk_it); 459 400 460 /* 401 /* 461 * Setup physical memory management 402 * Setup physical memory management 462 */ 403 */ 463 404 464 SOS_ASSERT_FATAL(SOS_OK !! 405 /* Multiboot says: "The value returned for upper memory is maximally 465 == sos_physmem_subsystem_se !! 406 the address of the first upper memory hole minus 1 megabyte.". It 466 !! 407 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 467 !! 408 sos_physmem_subsystem_setup((mbi->mem_upper<<10) + (1<<20), >> 409 & sos_kernel_core_base_paddr, >> 410 & sos_kernel_core_top_paddr); 468 411 469 /* 412 /* 470 * Switch to paged-memory mode 413 * Switch to paged-memory mode 471 */ 414 */ 472 415 473 /* Disabling interrupts should seem more cor 416 /* Disabling interrupts should seem more correct, but it's not really 474 necessary at this stage */ 417 necessary at this stage */ 475 SOS_ASSERT_FATAL(SOS_OK == 418 SOS_ASSERT_FATAL(SOS_OK == 476 sos_paging_subsystem_setup( 419 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 477 420 sos_kernel_core_top_paddr)); 478 421 479 /* Bind the page fault exception */ 422 /* Bind the page fault exception */ 480 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 423 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 481 pgflt_ex); 424 pgflt_ex); 482 425 483 /* 426 /* 484 * Setup kernel virtual memory allocator 427 * Setup kernel virtual memory allocator 485 */ 428 */ 486 429 487 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 430 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 488 sos_kernel_ 431 sos_kernel_core_top_paddr, 489 bootstrap_s 432 bootstrap_stack_bottom, 490 bootstrap_s 433 bootstrap_stack_bottom 491 + bootstrap 434 + bootstrap_stack_size)) 492 sos_bochs_printf("Could not setup the Kern 435 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 493 436 494 if (sos_kmalloc_subsystem_setup()) 437 if (sos_kmalloc_subsystem_setup()) 495 sos_bochs_printf("Could not setup the Kmal 438 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 496 439 497 /* 440 /* 498 * Initialize the MMU context subsystem 441 * Initialize the MMU context subsystem 499 */ 442 */ 500 sos_mm_context_subsystem_setup(); 443 sos_mm_context_subsystem_setup(); 501 444 502 /* 445 /* 503 * Initialize the CPU context subsystem 446 * Initialize the CPU context subsystem 504 */ 447 */ 505 sos_cpu_context_subsystem_setup(); 448 sos_cpu_context_subsystem_setup(); 506 449 507 /* 450 /* 508 * Bind the syscall handler to its software 451 * Bind the syscall handler to its software interrupt handler 509 */ 452 */ 510 sos_swintr_subsystem_setup(); 453 sos_swintr_subsystem_setup(); 511 454 512 455 513 /* 456 /* 514 * Initialize the Kernel thread and schedule 457 * Initialize the Kernel thread and scheduler subsystems 515 */ 458 */ 516 459 517 /* Initialize kernel thread subsystem */ 460 /* Initialize kernel thread subsystem */ 518 sos_thread_subsystem_setup(bootstrap_stack_b 461 sos_thread_subsystem_setup(bootstrap_stack_bottom, 519 bootstrap_stack_s 462 bootstrap_stack_size); 520 463 521 /* Initialize the scheduler */ 464 /* Initialize the scheduler */ 522 sos_sched_subsystem_setup(); 465 sos_sched_subsystem_setup(); 523 466 524 /* Declare the IDLE thread */ 467 /* Declare the IDLE thread */ 525 SOS_ASSERT_FATAL(sos_create_kernel_thread("i 468 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, 526 SO 469 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 527 470 528 /* Prepare the stats subsystem */ 471 /* Prepare the stats subsystem */ 529 sos_load_subsystem_setup(); 472 sos_load_subsystem_setup(); 530 473 531 /* Declare a thread that prints some stats * 474 /* Declare a thread that prints some stats */ 532 SOS_ASSERT_FATAL(sos_create_kernel_thread("s 475 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, 533 NU 476 NULL, 534 SO 477 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 535 478 536 479 537 /* 480 /* 538 * Initialise user address space management << 539 */ << 540 sos_umem_vmm_subsystem_setup(); << 541 sos_dev_zero_subsystem_setup(); << 542 << 543 /* << 544 * Initialize process stuff 481 * Initialize process stuff 545 */ 482 */ 546 sos_process_subsystem_setup(); 483 sos_process_subsystem_setup(); 547 484 548 485 549 /* Enabling the HW interrupts here, this wil 486 /* Enabling the HW interrupts here, this will make the timer HW 550 interrupt call the scheduler */ 487 interrupt call the scheduler */ 551 asm volatile ("sti\n"); 488 asm volatile ("sti\n"); 552 489 >> 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(); 553 498 554 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_sub << 555 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_ << 556 << 557 << 558 << 559 << 560 << 561 /* Start the 'init' process, which in turns << 562 programs */ << 563 start_init(rootfs); << 564 /* 499 /* 565 * We can safely exit from this function now 500 * We can safely exit from this function now, for there is already 566 * an idle Kernel thread ready to make the C 501 * an idle Kernel thread ready to make the CPU busy working... 567 * 502 * 568 * However, we must EXPLICITELY call sos_thr 503 * However, we must EXPLICITELY call sos_thread_exit() because a 569 * simple "return" will return nowhere ! Act 504 * simple "return" will return nowhere ! Actually this first thread 570 * was initialized by the Grub bootstrap sta 505 * was initialized by the Grub bootstrap stage, at a time when the 571 * word "thread" did not exist. This means t 506 * word "thread" did not exist. This means that the stack was not 572 * setup in order for a return here to call 507 * setup in order for a return here to call sos_thread_exit() 573 * automagically. Hence we must call it manu 508 * automagically. Hence we must call it manually. This is the ONLY 574 * kernel thread where we must do this manua 509 * kernel thread where we must do this manually. 575 */ 510 */ 576 sos_bochs_printf("Bye from primary thread !\ 511 sos_bochs_printf("Bye from primary thread !\n"); 577 sos_thread_exit(); 512 sos_thread_exit(); 578 SOS_FATAL_ERROR("No trespassing !"); 513 SOS_FATAL_ERROR("No trespassing !"); 579 } 514 }
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