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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 #include <drivers/devices.h> << 050 #include <drivers/mem.h> << 051 #include <drivers/tty.h> << 052 #include <drivers/console.h> << 053 #include <drivers/serial.h> << 054 042 055 /* Helper function to display each bits of a 3 043 /* Helper function to display each bits of a 32bits integer on the 056 screen as dark or light carrets */ 044 screen as dark or light carrets */ 057 void display_bits(unsigned char row, unsigned 045 void display_bits(unsigned char row, unsigned char col, 058 unsigned char attribute, 046 unsigned char attribute, 059 sos_ui32_t integer) 047 sos_ui32_t integer) 060 { 048 { 061 int i; 049 int i; 062 /* Scan each bit of the integer, MSb first * 050 /* Scan each bit of the integer, MSb first */ 063 for (i = 31 ; i >= 0 ; i--) 051 for (i = 31 ; i >= 0 ; i--) 064 { 052 { 065 /* Test if bit i of 'integer' is set */ 053 /* Test if bit i of 'integer' is set */ 066 int bit_i = (integer & (1 << i)); 054 int bit_i = (integer & (1 << i)); 067 /* Ascii 219 => dark carret, Ascii 177 = 055 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 068 unsigned char ascii_code = bit_i?219:177 056 unsigned char ascii_code = bit_i?219:177; 069 sos_x86_videomem_putchar(row, col++, 057 sos_x86_videomem_putchar(row, col++, 070 attribute, 058 attribute, 071 ascii_code); 059 ascii_code); 072 } 060 } 073 } 061 } 074 062 >> 063 075 /* Clock IRQ handler */ 064 /* Clock IRQ handler */ 076 static void clk_it(int intid) 065 static void clk_it(int intid) 077 { 066 { 078 static sos_ui32_t clock_count = 0; 067 static sos_ui32_t clock_count = 0; 079 068 080 display_bits(0, 48, 069 display_bits(0, 48, 081 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 070 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 082 clock_count); 071 clock_count); 083 clock_count++; 072 clock_count++; 084 073 085 /* Execute the expired timeout actions (if a 074 /* Execute the expired timeout actions (if any) */ 086 sos_time_do_tick(); 075 sos_time_do_tick(); 087 076 088 /* Update scheduler statistics and status */ 077 /* Update scheduler statistics and status */ 089 sos_sched_do_timer_tick(); 078 sos_sched_do_timer_tick(); 090 } 079 } 091 080 092 081 093 /* =========================================== 082 /* ====================================================================== 094 * Page fault exception handling 083 * Page fault exception handling 095 */ 084 */ 096 085 097 086 098 /* Page fault exception handler with demand pa 087 /* Page fault exception handler with demand paging for the kernel */ 099 static void pgflt_ex(int intid, struct sos_cpu 088 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 100 { 089 { 101 static sos_ui32_t demand_paging_count = 0; 090 static sos_ui32_t demand_paging_count = 0; 102 struct sos_thread * cur_thr = sos_thread_get << 103 sos_vaddr_t faulting_vaddr = sos_cpu_contex 091 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 104 sos_paddr_t ppage_paddr; 092 sos_paddr_t ppage_paddr; 105 093 106 if (sos_cpu_context_is_in_user_mode(ctxt) !! 094 if (sos_cpu_context_is_in_user_mode(ctxt)) 107 || (cur_thr->fixup_uaccess.return_vaddr) << 108 { 095 { 109 __label__ unforce_address_space; !! 096 /* User-mode page faults are considered unresolved for the 110 sos_bool_t need_to_setup_mmu; !! 097 moment */ 111 sos_ui32_t errcode = sos_cpu_context_get << 112 << 113 /* Make sure to always stay in the inter << 114 configuration */ << 115 need_to_setup_mmu = (cur_thr->squatted_m << 116 != sos_process_get_ << 117 if (need_to_setup_mmu) << 118 sos_thread_prepare_user_space_access(N << 119 << 120 if (SOS_OK == << 121 sos_umem_vmm_try_resolve_page_fault( << 122 << 123 << 124 goto unforce_address_space; << 125 << 126 /* If the page fault occured in kernel m << 127 the fixup address */ << 128 if (! sos_cpu_context_is_in_user_mode(ct << 129 { << 130 cur_thr->fixup_uaccess.faulted_uaddr << 131 sos_cpu_context_set_EX_return_addres << 132 << 133 goto unforce_address_space; << 134 } << 135 << 136 if (need_to_setup_mmu) << 137 sos_thread_end_user_space_access(); << 138 << 139 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", 140 sos_cpu_context_get_PC( 099 sos_cpu_context_get_PC(ctxt), 141 (unsigned)faulting_vadd 100 (unsigned)faulting_vaddr, 142 (unsigned)sos_cpu_conte 101 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 143 sos_bochs_printf("Terminating User threa 102 sos_bochs_printf("Terminating User thread\n"); 144 sos_thread_exit(); 103 sos_thread_exit(); 145 << 146 unforce_address_space: << 147 if (need_to_setup_mmu) << 148 sos_thread_end_user_space_access(); << 149 return; << 150 } 104 } 151 105 152 /* Check if address is covered by any VMM ra 106 /* Check if address is covered by any VMM range */ 153 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 107 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 154 { 108 { 155 /* No: The page fault is out of any kern 109 /* No: The page fault is out of any kernel virtual region. For 156 the moment, we don't handle this. */ 110 the moment, we don't handle this. */ 157 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)!", 158 sos_cpu_context_ 112 sos_cpu_context_get_PC(ctxt), 159 (unsigned)faulti 113 (unsigned)faulting_vaddr, 160 (unsigned)sos_cp 114 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 161 SOS_ASSERT_FATAL(! "Got page fault (note 115 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 162 } 116 } 163 117 164 118 165 /* 119 /* 166 * Demand paging in kernel space 120 * Demand paging in kernel space 167 */ 121 */ 168 122 169 /* Update the number of demand paging reques 123 /* Update the number of demand paging requests handled */ 170 demand_paging_count ++; 124 demand_paging_count ++; 171 display_bits(0, 0, 125 display_bits(0, 0, 172 SOS_X86_VIDEO_FG_LTRED | SOS_X8 126 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 173 demand_paging_count); 127 demand_paging_count); 174 128 175 /* Allocate a new page for the virtual addre 129 /* Allocate a new page for the virtual address */ 176 ppage_paddr = sos_physmem_ref_physpage_new(F 130 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 177 if (! ppage_paddr) 131 if (! ppage_paddr) 178 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 !)"); 179 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 133 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 180 SO 134 SOS_PAGE_ALIGN_INF(faulting_vaddr), 181 FA 135 FALSE, 182 SO 136 SOS_VM_MAP_PROT_READ 183 | 137 | SOS_VM_MAP_PROT_WRITE 184 | 138 | SOS_VM_MAP_ATOMIC)); 185 sos_physmem_unref_physpage(ppage_paddr); 139 sos_physmem_unref_physpage(ppage_paddr); 186 140 187 /* Ok, we can now return to interrupted cont 141 /* Ok, we can now return to interrupted context */ 188 } 142 } 189 143 190 144 >> 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 } >> 240 191 241 192 /* =========================================== 242 /* ====================================================================== 193 * An operating system MUST always have a read 243 * An operating system MUST always have a ready thread ! Otherwise: 194 * what would the CPU have to execute ?! 244 * what would the CPU have to execute ?! 195 */ 245 */ 196 static void idle_thread() 246 static void idle_thread() 197 { 247 { 198 sos_ui32_t idle_twiddle = 0; 248 sos_ui32_t idle_twiddle = 0; 199 249 200 while (1) 250 while (1) 201 { 251 { 202 /* Remove this instruction if you get an 252 /* Remove this instruction if you get an "Invalid opcode" CPU 203 exception (old 80386 CPU) */ 253 exception (old 80386 CPU) */ 204 asm("hlt\n"); 254 asm("hlt\n"); 205 255 206 idle_twiddle ++; 256 idle_twiddle ++; 207 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE 257 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 208 idle_twiddle); 258 idle_twiddle); 209 259 210 /* Lend the CPU to some other thread */ 260 /* Lend the CPU to some other thread */ 211 sos_thread_yield(); 261 sos_thread_yield(); 212 } 262 } 213 } 263 } 214 264 215 265 216 /* =========================================== 266 /* ====================================================================== 217 * Kernel thread showing some CPU usage statis 267 * Kernel thread showing some CPU usage statistics on the console every 1s 218 */ 268 */ 219 #define LOAD_DISPLAY_BASELINE 4 << 220 #define LOAD_DISPLAY_STARTROW 34 << 221 static void stat_thread() 269 static void stat_thread() 222 { 270 { 223 while (1) 271 while (1) 224 { 272 { 225 sos_ui32_t flags; 273 sos_ui32_t flags; 226 sos_ui32_t load1, load5, load15; 274 sos_ui32_t load1, load5, load15; 227 char str1[11], str5[11], str15[11]; 275 char str1[11], str5[11], str15[11]; 228 struct sos_time t; 276 struct sos_time t; 229 t.sec = 1; 277 t.sec = 1; 230 t.nanosec = 0; 278 t.nanosec = 0; 231 279 232 sos_thread_sleep(& t); 280 sos_thread_sleep(& t); 233 281 234 sos_disable_IRQs(flags); 282 sos_disable_IRQs(flags); 235 283 236 /* The IDLE task is EXcluded in the foll 284 /* The IDLE task is EXcluded in the following computation */ 237 sos_load_get_sload(&load1, &load5, &load 285 sos_load_get_sload(&load1, &load5, &load15); 238 sos_load_to_string(str1, load1); 286 sos_load_to_string(str1, load1); 239 sos_load_to_string(str5, load5); 287 sos_load_to_string(str5, load5); 240 sos_load_to_string(str15, load15); 288 sos_load_to_string(str15, load15); 241 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 289 sos_x86_videomem_printf(16, 34, 242 SOS_X86_VIDEO_FG 290 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 243 "Kernel (- Idle) 291 "Kernel (- Idle): %s %s %s ", 244 str1, str5, str1 292 str1, str5, str15); 245 293 246 sos_load_get_uload(&load1, &load5, &load 294 sos_load_get_uload(&load1, &load5, &load15); 247 sos_load_to_string(str1, load1); 295 sos_load_to_string(str1, load1); 248 sos_load_to_string(str5, load5); 296 sos_load_to_string(str5, load5); 249 sos_load_to_string(str15, load15); 297 sos_load_to_string(str15, load15); 250 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 298 sos_x86_videomem_printf(17, 34, 251 SOS_X86_VIDEO_FG 299 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 252 "User: %s %s %s 300 "User: %s %s %s ", 253 str1, str5, str1 301 str1, str5, str15); 254 302 255 sos_load_get_uratio(&load1, &load5, &loa 303 sos_load_get_uratio(&load1, &load5, &load15); 256 sos_load_to_string(str1, load1); 304 sos_load_to_string(str1, load1); 257 sos_load_to_string(str5, load5); 305 sos_load_to_string(str5, load5); 258 sos_load_to_string(str15, load15); 306 sos_load_to_string(str15, load15); 259 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 307 sos_x86_videomem_printf(18, 34, 260 SOS_X86_VIDEO_FG 308 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 261 "User CPU %%: %s 309 "User CPU %%: %s %s %s ", 262 str1, str5, str1 310 str1, str5, str15); 263 311 264 /* The IDLE task is INcluded in the foll 312 /* The IDLE task is INcluded in the following computation */ 265 sos_load_get_sratio(&load1, &load5, &loa 313 sos_load_get_sratio(&load1, &load5, &load15); 266 sos_load_to_string(str1, load1); 314 sos_load_to_string(str1, load1); 267 sos_load_to_string(str5, load5); 315 sos_load_to_string(str5, load5); 268 sos_load_to_string(str15, load15); 316 sos_load_to_string(str15, load15); 269 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 317 sos_x86_videomem_printf(19, 34, 270 SOS_X86_VIDEO_FG 318 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 271 "Kernel CPU %% ( 319 "Kernel CPU %% (+ Idle): %s %s %s ", 272 str1, str5, str1 320 str1, str5, str15); 273 sos_restore_IRQs(flags); 321 sos_restore_IRQs(flags); 274 } 322 } 275 } 323 } 276 324 277 325 278 /* =========================================== 326 /* ====================================================================== 279 * Start the "init" (userland) process << 280 */ << 281 static sos_ret_t << 282 start_init(struct sos_fs_manager_instance * ro << 283 { << 284 sos_ret_t retval; << 285 struct sos_umem_vmm_as *as_init; << 286 struct sos_process *proc_init; << 287 struct sos_thread *new_thr; << 288 sos_uaddr_t ustack, start_uaddr; << 289 struct sos_fs_opened_file * init_root, * ini << 290 << 291 /* Create the new process */ << 292 proc_init = sos_process_create("init", FALSE << 293 if (! proc_init) << 294 return -SOS_ENOMEM; << 295 as_init = sos_process_get_address_space(proc << 296 << 297 << 298 /* << 299 * Setup the root and CWD directories of the << 300 * this process will correspond to the "glob << 301 * system since all the future processes wil << 302 */ << 303 retval = sos_fs_new_opened_file(proc_init, r << 304 SOS_FS_OPEN_ << 305 & init_root) << 306 if (SOS_OK != retval) << 307 { << 308 sos_process_unref(proc_init); << 309 return -SOS_ENOENT; << 310 } << 311 << 312 /* Duplicate the root file to set the curren << 313 the init process */ << 314 retval = sos_fs_duplicate_opened_file(init_r << 315 & init << 316 if (SOS_OK != retval) << 317 { << 318 sos_fs_close(init_root); << 319 sos_process_unref(proc_init); << 320 return -SOS_ENOENT; << 321 } << 322 << 323 /* Now update the process ! */ << 324 if ( ( SOS_OK != sos_process_chroot(proc_ini << 325 || ( SOS_OK != sos_process_chdir(proc_i << 326 { << 327 sos_fs_close(init_root); << 328 sos_fs_close(init_cwd); << 329 sos_process_chroot(proc_init, NULL, & un << 330 sos_process_chdir(proc_init, NULL, & unu << 331 sos_process_unref(proc_init); << 332 return -SOS_ENOENT; << 333 } << 334 << 335 << 336 << 337 /* Map the 'init' program in user space */ << 338 start_uaddr = sos_binfmt_elf32_map(as_init, << 339 if (0 == start_uaddr) << 340 { << 341 sos_process_unref(proc_init); << 342 return -SOS_ENOENT; << 343 } << 344 << 345 /* Allocate the user stack */ << 346 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ << 347 retval = sos_dev_zero_map(as_init, &ustack, << 348 SOS_VM_MAP_PROT_RE << 349 /* PRIVATE */ 0); << 350 if (SOS_OK != retval) << 351 { << 352 sos_process_unref(proc_init); << 353 return -SOS_ENOMEM; << 354 } << 355 << 356 /* Now create the user thread */ << 357 new_thr = sos_create_user_thread(NULL, << 358 proc_init, << 359 start_uaddr << 360 0, 0, << 361 ustack + SO << 362 SOS_SCHED_P << 363 if (! new_thr) << 364 { << 365 sos_process_unref(proc_init); << 366 return -SOS_ENOMEM; << 367 } << 368 << 369 sos_process_unref(proc_init); << 370 return SOS_OK; << 371 } << 372 << 373 << 374 /* =========================================== << 375 * The C entry point of our operating system 327 * The C entry point of our operating system 376 */ 328 */ 377 void sos_main(unsigned long magic, unsigned lo !! 329 void sos_main(unsigned long magic, unsigned long addr) 378 { 330 { 379 unsigned i; 331 unsigned i; 380 sos_paddr_t sos_kernel_core_base_paddr, sos_ 332 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 381 struct sos_time tick_resolution; 333 struct sos_time tick_resolution; 382 struct sos_fs_manager_instance * rootfs; << 383 334 384 /* Size of RAM above 1MB. Might be undefined !! 335 /* Grub sends us a structure, called multiboot_info_t with a lot of 385 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; 386 340 387 /* Setup bochs and console, and clear the co 341 /* Setup bochs and console, and clear the console */ 388 sos_bochs_subsystem_setup(); !! 342 sos_bochs_setup(); 389 343 390 sos_x86_videomem_setup(); 344 sos_x86_videomem_setup(); 391 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 345 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 392 346 393 /* Greetings from SOS */ 347 /* Greetings from SOS */ 394 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 348 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 395 { !! 349 /* Loaded with Grub */ 396 /* Grub sends us a structure, called mul !! 350 sos_x86_videomem_printf(1, 0, 397 precious informations about the syste !! 351 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 398 documentation for more information. * !! 352 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 399 multiboot_info_t *mbi = (multiboot_info_ !! 353 "SOS article 7", ',', 400 !! 354 (unsigned)(mbi->mem_upper >> 10) + 1, 401 /* Multiboot says: "The value returned f !! 355 (unsigned)mbi->mem_upper); 402 maximally the address of the first up << 403 megabyte.". It also adds: "It is not << 404 value." aka "YMMV" ;) */ << 405 upper_mem = mbi->mem_upper; << 406 sos_x86_videomem_printf(1, 0, << 407 SOS_X86_VIDEO_FG << 408 "Welcome From GR << 409 "SOS article 9", << 410 (unsigned)(upper << 411 (unsigned)upper_ << 412 } << 413 else if (magic == 0x42244224) << 414 { << 415 /* Loaded with SOS bootsect */ << 416 upper_mem = arg; << 417 sos_x86_videomem_printf(1, 0, << 418 SOS_X86_VIDEO_FG << 419 "Welcome to %s%c << 420 "SOS article 9", << 421 (unsigned)(upper << 422 (unsigned)upper_ << 423 } << 424 else 356 else 425 /* Not loaded with grub, not from an enhan !! 357 /* Not loaded with grub */ 426 sos_x86_videomem_printf(1, 0, 358 sos_x86_videomem_printf(1, 0, 427 SOS_X86_VIDEO_FG_Y 359 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 428 "Welcome to SOS ar !! 360 "Welcome to SOS article 7"); 429 361 430 sos_bochs_putstring("Message in a bochs: Thi !! 362 sos_bochs_putstring("Message in a bochs: This is SOS article 7.\n"); 431 363 432 /* Setup CPU segmentation and IRQ subsystem 364 /* Setup CPU segmentation and IRQ subsystem */ 433 sos_gdt_subsystem_setup(); 365 sos_gdt_subsystem_setup(); 434 sos_idt_subsystem_setup(); 366 sos_idt_subsystem_setup(); 435 367 436 /* Setup SOS IRQs and exceptions subsystem * 368 /* Setup SOS IRQs and exceptions subsystem */ 437 sos_exception_subsystem_setup(); 369 sos_exception_subsystem_setup(); 438 sos_irq_subsystem_setup(); 370 sos_irq_subsystem_setup(); 439 371 440 /* Configure the timer so as to raise the IR 372 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 441 sos_i8254_set_frequency(100); 373 sos_i8254_set_frequency(100); 442 374 443 /* Setup the kernel time subsystem to get pr 375 /* Setup the kernel time subsystem to get prepared to take the timer 444 ticks into account */ 376 ticks into account */ 445 tick_resolution = (struct sos_time) { .sec=0 377 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 446 sos_time_subsysem_setup(& tick_resolution); 378 sos_time_subsysem_setup(& tick_resolution); 447 379 448 /* We need to know the RAM size */ !! 380 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 449 if (upper_mem == 0) !! 381 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 450 { 382 { 451 sos_x86_videomem_putstring(20, 0, 383 sos_x86_videomem_putstring(20, 0, 452 SOS_X86_VIDEO 384 SOS_X86_VIDEO_FG_LTRED 453 | SOS_X86_V 385 | SOS_X86_VIDEO_BG_BLUE 454 | SOS_X86_V 386 | SOS_X86_VIDEO_FG_BLINKING, 455 "I don't know !! 387 "I'm not loaded with Grub !"); 456 /* STOP ! */ 388 /* STOP ! */ 457 for (;;) 389 for (;;) 458 continue; 390 continue; 459 } 391 } 460 392 461 /* 393 /* 462 * Some interrupt handlers 394 * Some interrupt handlers 463 */ 395 */ 464 396 465 /* Binding some HW interrupts and exceptions 397 /* Binding some HW interrupts and exceptions to software routines */ 466 sos_irq_set_routine(SOS_IRQ_TIMER, 398 sos_irq_set_routine(SOS_IRQ_TIMER, 467 clk_it); 399 clk_it); 468 400 469 /* 401 /* 470 * Setup physical memory management 402 * Setup physical memory management 471 */ 403 */ 472 404 473 SOS_ASSERT_FATAL(SOS_OK !! 405 /* Multiboot says: "The value returned for upper memory is maximally 474 == sos_physmem_subsystem_se !! 406 the address of the first upper memory hole minus 1 megabyte.". It 475 !! 407 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 476 !! 408 sos_physmem_subsystem_setup((mbi->mem_upper<<10) + (1<<20), >> 409 & sos_kernel_core_base_paddr, >> 410 & sos_kernel_core_top_paddr); 477 411 478 /* 412 /* 479 * Switch to paged-memory mode 413 * Switch to paged-memory mode 480 */ 414 */ 481 415 482 /* Disabling interrupts should seem more cor 416 /* Disabling interrupts should seem more correct, but it's not really 483 necessary at this stage */ 417 necessary at this stage */ 484 SOS_ASSERT_FATAL(SOS_OK == 418 SOS_ASSERT_FATAL(SOS_OK == 485 sos_paging_subsystem_setup( 419 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 486 420 sos_kernel_core_top_paddr)); 487 421 488 /* Bind the page fault exception */ 422 /* Bind the page fault exception */ 489 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 423 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 490 pgflt_ex); 424 pgflt_ex); 491 425 492 /* 426 /* 493 * Setup kernel virtual memory allocator 427 * Setup kernel virtual memory allocator 494 */ 428 */ 495 429 496 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 430 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 497 sos_kernel_ 431 sos_kernel_core_top_paddr, 498 bootstrap_s 432 bootstrap_stack_bottom, 499 bootstrap_s 433 bootstrap_stack_bottom 500 + bootstrap 434 + bootstrap_stack_size)) 501 sos_bochs_printf("Could not setup the Kern 435 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 502 436 503 if (sos_kmalloc_subsystem_setup()) 437 if (sos_kmalloc_subsystem_setup()) 504 sos_bochs_printf("Could not setup the Kmal 438 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 505 439 506 /* 440 /* 507 * Initialize the MMU context subsystem 441 * Initialize the MMU context subsystem 508 */ 442 */ 509 sos_mm_context_subsystem_setup(); 443 sos_mm_context_subsystem_setup(); 510 444 511 /* 445 /* 512 * Initialize the CPU context subsystem 446 * Initialize the CPU context subsystem 513 */ 447 */ 514 sos_cpu_context_subsystem_setup(); 448 sos_cpu_context_subsystem_setup(); 515 449 516 /* 450 /* 517 * Bind the syscall handler to its software 451 * Bind the syscall handler to its software interrupt handler 518 */ 452 */ 519 sos_swintr_subsystem_setup(); 453 sos_swintr_subsystem_setup(); 520 454 521 455 522 /* 456 /* 523 * Initialize the Kernel thread and schedule 457 * Initialize the Kernel thread and scheduler subsystems 524 */ 458 */ 525 459 526 /* Initialize kernel thread subsystem */ 460 /* Initialize kernel thread subsystem */ 527 sos_thread_subsystem_setup(bootstrap_stack_b 461 sos_thread_subsystem_setup(bootstrap_stack_bottom, 528 bootstrap_stack_s 462 bootstrap_stack_size); 529 463 530 /* Initialize the scheduler */ 464 /* Initialize the scheduler */ 531 sos_sched_subsystem_setup(); 465 sos_sched_subsystem_setup(); 532 466 533 /* Declare the IDLE thread */ 467 /* Declare the IDLE thread */ 534 SOS_ASSERT_FATAL(sos_create_kernel_thread("i 468 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, 535 SO 469 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 536 470 537 /* Prepare the stats subsystem */ 471 /* Prepare the stats subsystem */ 538 sos_load_subsystem_setup(); 472 sos_load_subsystem_setup(); 539 473 540 /* Declare a thread that prints some stats * 474 /* Declare a thread that prints some stats */ 541 SOS_ASSERT_FATAL(sos_create_kernel_thread("s 475 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, 542 NU 476 NULL, 543 SO 477 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 544 478 545 479 546 /* 480 /* 547 * Initialise user address space management << 548 */ << 549 sos_umem_vmm_subsystem_setup(); << 550 sos_dev_zero_subsystem_setup(); << 551 sos_dev_mem_chardev_setup(); << 552 << 553 /* << 554 * Initialize process stuff 481 * Initialize process stuff 555 */ 482 */ 556 sos_process_subsystem_setup(); 483 sos_process_subsystem_setup(); 557 484 558 485 559 /* Enabling the HW interrupts here, this wil 486 /* Enabling the HW interrupts here, this will make the timer HW 560 interrupt call the scheduler */ 487 interrupt call the scheduler */ 561 asm volatile ("sti\n"); 488 asm volatile ("sti\n"); 562 489 >> 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(); 563 498 564 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_sub << 565 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_ << 566 << 567 << 568 << 569 << 570 << 571 tty_subsystem_setup(); << 572 sos_ttyS0_subsystem_setup(); << 573 sos_console_subsystem_setup(); << 574 << 575 << 576 << 577 << 578 /* Start the 'init' process, which in turns << 579 programs */ << 580 start_init(rootfs); << 581 /* 499 /* 582 * We can safely exit from this function now 500 * We can safely exit from this function now, for there is already 583 * an idle Kernel thread ready to make the C 501 * an idle Kernel thread ready to make the CPU busy working... 584 * 502 * 585 * However, we must EXPLICITELY call sos_thr 503 * However, we must EXPLICITELY call sos_thread_exit() because a 586 * simple "return" will return nowhere ! Act 504 * simple "return" will return nowhere ! Actually this first thread 587 * was initialized by the Grub bootstrap sta 505 * was initialized by the Grub bootstrap stage, at a time when the 588 * word "thread" did not exist. This means t 506 * word "thread" did not exist. This means that the stack was not 589 * setup in order for a return here to call 507 * setup in order for a return here to call sos_thread_exit() 590 * automagically. Hence we must call it manu 508 * automagically. Hence we must call it manually. This is the ONLY 591 * kernel thread where we must do this manua 509 * kernel thread where we must do this manually. 592 */ 510 */ 593 sos_bochs_printf("Bye from primary thread !\ 511 sos_bochs_printf("Bye from primary thread !\n"); 594 sos_thread_exit(); 512 sos_thread_exit(); 595 SOS_FATAL_ERROR("No trespassing !"); 513 SOS_FATAL_ERROR("No trespassing !"); 596 } 514 }
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