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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> >> 020 019 /* Include definitions of the multiboot standa 021 /* Include definitions of the multiboot standard */ 020 #include <bootstrap/multiboot.h> 022 #include <bootstrap/multiboot.h> 021 #include <hwcore/idt.h> 023 #include <hwcore/idt.h> 022 #include <hwcore/gdt.h> 024 #include <hwcore/gdt.h> 023 #include <hwcore/irq.h> 025 #include <hwcore/irq.h> 024 #include <hwcore/exception.h> 026 #include <hwcore/exception.h> 025 #include <hwcore/i8254.h> 027 #include <hwcore/i8254.h> 026 #include <sos/list.h> 028 #include <sos/list.h> 027 #include <sos/physmem.h> 029 #include <sos/physmem.h> 028 #include <hwcore/paging.h> 030 #include <hwcore/paging.h> 029 #include <hwcore/mm_context.h> 031 #include <hwcore/mm_context.h> 030 #include <hwcore/swintr.h> 032 #include <hwcore/swintr.h> 031 #include <sos/kmem_vmm.h> 033 #include <sos/kmem_vmm.h> 032 #include <sos/kmalloc.h> 034 #include <sos/kmalloc.h> 033 #include <sos/time.h> 035 #include <sos/time.h> 034 #include <sos/thread.h> 036 #include <sos/thread.h> 035 #include <sos/process.h> 037 #include <sos/process.h> >> 038 #include <sos/umem_vmm.h> 036 #include <sos/klibc.h> 039 #include <sos/klibc.h> 037 #include <sos/assert.h> 040 #include <sos/assert.h> 038 #include <drivers/x86_videomem.h> 041 #include <drivers/x86_videomem.h> 039 #include <drivers/bochs.h> 042 #include <drivers/bochs.h> 040 #include <sos/calcload.h> 043 #include <sos/calcload.h> 041 !! 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> 042 057 043 /* Helper function to display each bits of a 3 058 /* Helper function to display each bits of a 32bits integer on the 044 screen as dark or light carrets */ 059 screen as dark or light carrets */ 045 void display_bits(unsigned char row, unsigned 060 void display_bits(unsigned char row, unsigned char col, 046 unsigned char attribute, 061 unsigned char attribute, 047 sos_ui32_t integer) 062 sos_ui32_t integer) 048 { 063 { 049 int i; 064 int i; 050 /* Scan each bit of the integer, MSb first * 065 /* Scan each bit of the integer, MSb first */ 051 for (i = 31 ; i >= 0 ; i--) 066 for (i = 31 ; i >= 0 ; i--) 052 { 067 { 053 /* Test if bit i of 'integer' is set */ 068 /* Test if bit i of 'integer' is set */ 054 int bit_i = (integer & (1 << i)); 069 int bit_i = (integer & (1 << i)); 055 /* Ascii 219 => dark carret, Ascii 177 = 070 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 056 unsigned char ascii_code = bit_i?219:177 071 unsigned char ascii_code = bit_i?219:177; 057 sos_x86_videomem_putchar(row, col++, 072 sos_x86_videomem_putchar(row, col++, 058 attribute, 073 attribute, 059 ascii_code); 074 ascii_code); 060 } 075 } 061 } 076 } 062 077 063 << 064 /* Clock IRQ handler */ 078 /* Clock IRQ handler */ 065 static void clk_it(int intid) 079 static void clk_it(int intid) 066 { 080 { 067 static sos_ui32_t clock_count = 0; 081 static sos_ui32_t clock_count = 0; 068 082 069 display_bits(0, 48, 083 display_bits(0, 48, 070 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 084 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 071 clock_count); 085 clock_count); 072 clock_count++; 086 clock_count++; 073 087 074 /* Execute the expired timeout actions (if a 088 /* Execute the expired timeout actions (if any) */ 075 sos_time_do_tick(); 089 sos_time_do_tick(); 076 090 077 /* Update scheduler statistics and status */ 091 /* Update scheduler statistics and status */ 078 sos_sched_do_timer_tick(); 092 sos_sched_do_timer_tick(); 079 } 093 } 080 094 081 095 082 /* =========================================== 096 /* ====================================================================== 083 * Page fault exception handling 097 * Page fault exception handling 084 */ 098 */ 085 099 086 100 087 /* Page fault exception handler with demand pa 101 /* Page fault exception handler with demand paging for the kernel */ 088 static void pgflt_ex(int intid, struct sos_cpu 102 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 089 { 103 { 090 static sos_ui32_t demand_paging_count = 0; 104 static sos_ui32_t demand_paging_count = 0; >> 105 struct sos_thread * cur_thr = sos_thread_get_current(); 091 sos_vaddr_t faulting_vaddr = sos_cpu_contex 106 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 092 sos_paddr_t ppage_paddr; 107 sos_paddr_t ppage_paddr; 093 108 094 if (sos_cpu_context_is_in_user_mode(ctxt)) !! 109 if (sos_cpu_context_is_in_user_mode(ctxt) >> 110 || (cur_thr->fixup_uaccess.return_vaddr)) 095 { 111 { 096 /* User-mode page faults are considered !! 112 __label__ unforce_address_space; 097 moment */ !! 113 sos_bool_t need_to_setup_mmu; 098 sos_bochs_printf("Unresolved USER page F !! 114 sos_ui32_t errcode = sos_cpu_context_get_EX_info(ctxt); >> 115 >> 116 /* Make sure to always stay in the interrupted thread's MMU >> 117 configuration */ >> 118 need_to_setup_mmu = (cur_thr->squatted_mm_context >> 119 != sos_process_get_mm_context(cur_thr->process)); >> 120 if (need_to_setup_mmu) >> 121 sos_thread_prepare_user_space_access(NULL, 0); >> 122 >> 123 if (SOS_OK == >> 124 sos_umem_vmm_try_resolve_page_fault(faulting_vaddr, >> 125 errcode & (1 << 1), >> 126 TRUE)) >> 127 goto unforce_address_space; >> 128 >> 129 /* If the page fault occured in kernel mode, return to kernel to >> 130 the fixup address */ >> 131 if (! sos_cpu_context_is_in_user_mode(ctxt)) >> 132 { >> 133 cur_thr->fixup_uaccess.faulted_uaddr = faulting_vaddr; >> 134 sos_cpu_context_set_EX_return_address(ctxt, >> 135 cur_thr->fixup_uaccess.return_vaddr); >> 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: Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\e[m\n", >> 143 (void*)sos_thread_get_current(), 099 sos_cpu_context_get_PC( 144 sos_cpu_context_get_PC(ctxt), 100 (unsigned)faulting_vadd 145 (unsigned)faulting_vaddr, 101 (unsigned)sos_cpu_conte 146 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 102 sos_bochs_printf("Terminating User threa 147 sos_bochs_printf("Terminating User thread\n"); 103 sos_thread_exit(); 148 sos_thread_exit(); >> 149 >> 150 unforce_address_space: >> 151 if (need_to_setup_mmu) >> 152 sos_thread_end_user_space_access(); >> 153 return; 104 } 154 } 105 155 106 /* Check if address is covered by any VMM ra 156 /* Check if address is covered by any VMM range */ 107 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 157 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 108 { 158 { 109 /* No: The page fault is out of any kern 159 /* No: The page fault is out of any kernel virtual region. For 110 the moment, we don't handle this. */ 160 the moment, we don't handle this. */ 111 sos_display_fatal_error("Unresolved page 161 sos_display_fatal_error("Unresolved page Fault at instruction 0x%x on access to address 0x%x (info=%x)!", 112 sos_cpu_context_ 162 sos_cpu_context_get_PC(ctxt), 113 (unsigned)faulti 163 (unsigned)faulting_vaddr, 114 (unsigned)sos_cp 164 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 115 SOS_ASSERT_FATAL(! "Got page fault (note 165 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 116 } 166 } 117 167 118 168 119 /* 169 /* 120 * Demand paging in kernel space 170 * Demand paging in kernel space 121 */ 171 */ 122 172 123 /* Update the number of demand paging reques 173 /* Update the number of demand paging requests handled */ 124 demand_paging_count ++; 174 demand_paging_count ++; 125 display_bits(0, 0, 175 display_bits(0, 0, 126 SOS_X86_VIDEO_FG_LTRED | SOS_X8 176 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 127 demand_paging_count); 177 demand_paging_count); 128 178 129 /* Allocate a new page for the virtual addre 179 /* Allocate a new page for the virtual address */ 130 ppage_paddr = sos_physmem_ref_physpage_new(F 180 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 131 if (! ppage_paddr) 181 if (! ppage_paddr) 132 SOS_ASSERT_FATAL(! "TODO: implement swap. 182 SOS_ASSERT_FATAL(! "TODO: implement swap. (Out of mem in demand paging because no swap for kernel yet !)"); 133 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 183 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 134 SO 184 SOS_PAGE_ALIGN_INF(faulting_vaddr), 135 FA 185 FALSE, 136 SO 186 SOS_VM_MAP_PROT_READ 137 | 187 | SOS_VM_MAP_PROT_WRITE 138 | 188 | SOS_VM_MAP_ATOMIC)); 139 sos_physmem_unref_physpage(ppage_paddr); 189 sos_physmem_unref_physpage(ppage_paddr); 140 190 141 /* Ok, we can now return to interrupted cont 191 /* Ok, we can now return to interrupted context */ 142 } 192 } 143 193 144 194 145 /* =========================================== << 146 * Demonstrate the use of SOS kernel threads << 147 * - Kernel Threads are created with various << 148 * state is printed on both the console and << 149 * - For tests regarding threads' synchroniza << 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*)a << 165 int progress = 0; << 166 << 167 sos_bochs_printf("start %c", thr_arg->charac << 168 while (1) << 169 { << 170 progress ++; << 171 display_bits(thr_arg->row, thr_arg->col+ << 172 << 173 sos_bochs_putchar(thr_arg->character); << 174 << 175 /* Yield the CPU to another thread somet << 176 if ((random() % 100) == 0) << 177 { << 178 sos_bochs_printf("[37myield(%c)[m\ << 179 sos_x86_videomem_putchar(thr_arg->ro << 180 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 181 sos_x86_videomem_putchar(thr_arg->ro << 182 } << 183 << 184 /* Go to sleep some other times... */ << 185 else if ((random() % 200) == 0) << 186 { << 187 struct sos_time t = (struct sos_time << 188 sos_bochs_printf("[37msleep1(%c)[m << 189 sos_x86_videomem_putchar(thr_arg->ro << 190 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 191 SOS_ASSERT_FATAL(sos_time_is_zero(& << 192 sos_x86_videomem_putchar(thr_arg->ro << 193 } << 194 << 195 /* Go to sleep for a longer time some ot << 196 else if ((random() % 300) == 0) << 197 { << 198 struct sos_time t = (struct sos_time << 199 sos_bochs_printf("[37msleep2(%c)[m << 200 sos_x86_videomem_putchar(thr_arg->ro << 201 SOS_ASSERT_FATAL(SOS_OK == sos_threa << 202 SOS_ASSERT_FATAL(sos_time_is_zero(& << 203 sos_x86_videomem_putchar(thr_arg->ro << 204 } << 205 << 206 /* Infinite loop otherwise */ << 207 } << 208 } << 209 << 210 << 211 static void test_thread() << 212 { << 213 /* "static" variables because we want them t << 214 function returns */ << 215 static struct thr_arg arg_b, arg_c, arg_d, a << 216 sos_ui32_t flags; << 217 << 218 sos_disable_IRQs(flags); << 219 << 220 arg_b = (struct thr_arg) { .character='b', . << 221 sos_create_kernel_thread("YO[b]", demo_threa << 222 << 223 arg_c = (struct thr_arg) { .character='c', . << 224 sos_create_kernel_thread("YO[c]", demo_threa << 225 << 226 arg_d = (struct thr_arg) { .character='d', . << 227 sos_create_kernel_thread("YO[d]", demo_threa << 228 << 229 arg_e = (struct thr_arg) { .character='e', . << 230 sos_create_kernel_thread("YO[e]", demo_threa << 231 << 232 arg_R = (struct thr_arg) { .character='R', . << 233 sos_create_kernel_thread("YO[R]", demo_threa << 234 << 235 arg_S = (struct thr_arg) { .character='S', . << 236 sos_create_kernel_thread("YO[S]", demo_threa << 237 << 238 sos_restore_IRQs(flags); << 239 } << 240 << 241 195 242 /* =========================================== 196 /* ====================================================================== 243 * An operating system MUST always have a read 197 * An operating system MUST always have a ready thread ! Otherwise: 244 * what would the CPU have to execute ?! 198 * what would the CPU have to execute ?! 245 */ 199 */ 246 static void idle_thread() !! 200 static void idle_thread(void* unused) __attribute__((noreturn)); >> 201 static void idle_thread(void* unused) 247 { 202 { 248 sos_ui32_t idle_twiddle = 0; 203 sos_ui32_t idle_twiddle = 0; 249 204 250 while (1) 205 while (1) 251 { 206 { 252 /* Remove this instruction if you get an 207 /* Remove this instruction if you get an "Invalid opcode" CPU 253 exception (old 80386 CPU) */ 208 exception (old 80386 CPU) */ 254 asm("hlt\n"); 209 asm("hlt\n"); 255 210 256 idle_twiddle ++; 211 idle_twiddle ++; 257 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE 212 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 258 idle_twiddle); 213 idle_twiddle); 259 214 260 /* Lend the CPU to some other thread */ 215 /* Lend the CPU to some other thread */ 261 sos_thread_yield(); 216 sos_thread_yield(); 262 } 217 } 263 } 218 } 264 219 265 220 266 /* =========================================== 221 /* ====================================================================== 267 * Kernel thread showing some CPU usage statis 222 * Kernel thread showing some CPU usage statistics on the console every 1s 268 */ 223 */ 269 static void stat_thread() !! 224 #define LOAD_DISPLAY_BASELINE 4 >> 225 #define LOAD_DISPLAY_STARTROW 34 >> 226 static void stat_thread(void * unused) __attribute__((noreturn)); >> 227 static void stat_thread(void * unused) 270 { 228 { 271 while (1) 229 while (1) 272 { 230 { 273 sos_ui32_t flags; 231 sos_ui32_t flags; 274 sos_ui32_t load1, load5, load15; 232 sos_ui32_t load1, load5, load15; 275 char str1[11], str5[11], str15[11]; 233 char str1[11], str5[11], str15[11]; 276 struct sos_time t; 234 struct sos_time t; 277 t.sec = 1; 235 t.sec = 1; 278 t.nanosec = 0; 236 t.nanosec = 0; 279 237 280 sos_thread_sleep(& t); 238 sos_thread_sleep(& t); 281 239 282 sos_disable_IRQs(flags); 240 sos_disable_IRQs(flags); 283 241 284 /* The IDLE task is EXcluded in the foll 242 /* The IDLE task is EXcluded in the following computation */ 285 sos_load_get_sload(&load1, &load5, &load 243 sos_load_get_sload(&load1, &load5, &load15); 286 sos_load_to_string(str1, load1); 244 sos_load_to_string(str1, load1); 287 sos_load_to_string(str5, load5); 245 sos_load_to_string(str5, load5); 288 sos_load_to_string(str15, load15); 246 sos_load_to_string(str15, load15); 289 sos_x86_videomem_printf(16, 34, !! 247 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+0, LOAD_DISPLAY_STARTROW, 290 SOS_X86_VIDEO_FG 248 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 291 "Kernel (- Idle) 249 "Kernel (- Idle): %s %s %s ", 292 str1, str5, str1 250 str1, str5, str15); 293 251 294 sos_load_get_uload(&load1, &load5, &load 252 sos_load_get_uload(&load1, &load5, &load15); 295 sos_load_to_string(str1, load1); 253 sos_load_to_string(str1, load1); 296 sos_load_to_string(str5, load5); 254 sos_load_to_string(str5, load5); 297 sos_load_to_string(str15, load15); 255 sos_load_to_string(str15, load15); 298 sos_x86_videomem_printf(17, 34, !! 256 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+1, LOAD_DISPLAY_STARTROW, 299 SOS_X86_VIDEO_FG 257 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 300 "User: %s %s %s 258 "User: %s %s %s ", 301 str1, str5, str1 259 str1, str5, str15); 302 260 303 sos_load_get_uratio(&load1, &load5, &loa 261 sos_load_get_uratio(&load1, &load5, &load15); 304 sos_load_to_string(str1, load1); 262 sos_load_to_string(str1, load1); 305 sos_load_to_string(str5, load5); 263 sos_load_to_string(str5, load5); 306 sos_load_to_string(str15, load15); 264 sos_load_to_string(str15, load15); 307 sos_x86_videomem_printf(18, 34, !! 265 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+2, LOAD_DISPLAY_STARTROW, 308 SOS_X86_VIDEO_FG 266 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 309 "User CPU %%: %s 267 "User CPU %%: %s %s %s ", 310 str1, str5, str1 268 str1, str5, str15); 311 269 312 /* The IDLE task is INcluded in the foll 270 /* The IDLE task is INcluded in the following computation */ 313 sos_load_get_sratio(&load1, &load5, &loa 271 sos_load_get_sratio(&load1, &load5, &load15); 314 sos_load_to_string(str1, load1); 272 sos_load_to_string(str1, load1); 315 sos_load_to_string(str5, load5); 273 sos_load_to_string(str5, load5); 316 sos_load_to_string(str15, load15); 274 sos_load_to_string(str15, load15); 317 sos_x86_videomem_printf(19, 34, !! 275 sos_x86_videomem_printf(LOAD_DISPLAY_BASELINE+3, LOAD_DISPLAY_STARTROW, 318 SOS_X86_VIDEO_FG 276 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 319 "Kernel CPU %% ( 277 "Kernel CPU %% (+ Idle): %s %s %s ", 320 str1, str5, str1 278 str1, str5, str15); 321 sos_restore_IRQs(flags); 279 sos_restore_IRQs(flags); 322 } 280 } 323 } 281 } 324 282 325 283 326 /* =========================================== 284 /* ====================================================================== >> 285 * Start the "init" (userland) process >> 286 */ >> 287 static sos_ret_t >> 288 start_init(struct sos_fs_manager_instance * rootfs) >> 289 { >> 290 sos_ret_t retval; >> 291 struct sos_umem_vmm_as *as_init; >> 292 struct sos_process *proc_init; >> 293 struct sos_thread *new_thr; >> 294 sos_uaddr_t ustack, start_uaddr; >> 295 struct sos_fs_opened_file * init_root, * init_cwd, * unused_of; >> 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_init); >> 302 >> 303 >> 304 /* >> 305 * Setup the root and CWD directories of the process. The root of >> 306 * this process will correspond to the "global" root of the whole >> 307 * system since all the future processes will duplicate it ! >> 308 */ >> 309 retval = sos_fs_new_opened_file(proc_init, rootfs->root, >> 310 SOS_FS_OPEN_READ | SOS_FS_OPEN_WRITE, >> 311 & init_root); >> 312 if (SOS_OK != retval) >> 313 { >> 314 sos_process_unref(proc_init); >> 315 return -SOS_ENOENT; >> 316 } >> 317 >> 318 /* Duplicate the root file to set the current working directory of >> 319 the init process */ >> 320 retval = sos_fs_duplicate_opened_file(init_root, proc_init, >> 321 & init_cwd); >> 322 if (SOS_OK != retval) >> 323 { >> 324 sos_fs_close(init_root); >> 325 sos_process_unref(proc_init); >> 326 return -SOS_ENOENT; >> 327 } >> 328 >> 329 /* Now update the process ! */ >> 330 if ( ( SOS_OK != sos_process_chroot(proc_init, init_root, & unused_of) ) >> 331 || ( SOS_OK != sos_process_chdir(proc_init, init_cwd, & unused_of) ) ) >> 332 { >> 333 sos_fs_close(init_root); >> 334 sos_fs_close(init_cwd); >> 335 sos_process_chroot(proc_init, NULL, & unused_of); >> 336 sos_process_chdir(proc_init, NULL, & unused_of); >> 337 sos_process_unref(proc_init); >> 338 return -SOS_ENOENT; >> 339 } >> 340 >> 341 >> 342 >> 343 /* Map the 'init' program in user space */ >> 344 start_uaddr = sos_binfmt_elf32_map(as_init, "init"); >> 345 if (0 == start_uaddr) >> 346 { >> 347 sos_process_unref(proc_init); >> 348 return -SOS_ENOENT; >> 349 } >> 350 >> 351 /* Allocate the user stack */ >> 352 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_DEFAULT_USER_STACK_SIZE) + 1; >> 353 retval = sos_dev_zero_map(as_init, &ustack, SOS_DEFAULT_USER_STACK_SIZE, >> 354 SOS_VM_MAP_PROT_READ | SOS_VM_MAP_PROT_WRITE, >> 355 /* PRIVATE */ 0); >> 356 if (SOS_OK != retval) >> 357 { >> 358 sos_process_unref(proc_init); >> 359 return -SOS_ENOMEM; >> 360 } >> 361 >> 362 /* Now create the user thread */ >> 363 new_thr = sos_create_user_thread(NULL, >> 364 proc_init, >> 365 start_uaddr, >> 366 0, 0, >> 367 ustack + SOS_DEFAULT_USER_STACK_SIZE - 4, >> 368 SOS_SCHED_PRIO_TS_LOWEST); >> 369 if (! new_thr) >> 370 { >> 371 sos_process_unref(proc_init); >> 372 return -SOS_ENOMEM; >> 373 } >> 374 >> 375 sos_process_unref(proc_init); >> 376 return SOS_OK; >> 377 } >> 378 >> 379 >> 380 >> 381 /* ====================================================================== 327 * The C entry point of our operating system 382 * The C entry point of our operating system 328 */ 383 */ 329 void sos_main(unsigned long magic, unsigned lo !! 384 void sos_main(unsigned long magic, unsigned long arg) >> 385 __attribute__((noreturn)); >> 386 void sos_main(unsigned long magic, unsigned long arg) 330 { 387 { 331 unsigned i; << 332 sos_paddr_t sos_kernel_core_base_paddr, sos_ 388 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 333 struct sos_time tick_resolution; 389 struct sos_time tick_resolution; >> 390 struct sos_fs_manager_instance * rootfs; 334 391 335 /* Grub sends us a structure, called multibo !! 392 /* Size of RAM above 1MB. Might be undefined ! */ 336 precious informations about the system, s !! 393 unsigned long int upper_mem = 0; 337 documentation for more information. */ << 338 multiboot_info_t *mbi; << 339 mbi = (multiboot_info_t *) addr; << 340 394 341 /* Setup bochs and console, and clear the co 395 /* Setup bochs and console, and clear the console */ 342 sos_bochs_setup(); !! 396 sos_bochs_subsystem_setup(); 343 397 344 sos_x86_videomem_setup(); 398 sos_x86_videomem_setup(); 345 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 399 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 346 400 347 /* Greetings from SOS */ 401 /* Greetings from SOS */ 348 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 402 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 349 /* Loaded with Grub */ !! 403 { 350 sos_x86_videomem_printf(1, 0, !! 404 /* Grub sends us a structure, called multiboot_info_t with a lot of 351 SOS_X86_VIDEO_FG_Y !! 405 precious informations about the system, see the multiboot 352 "Welcome From GRUB !! 406 documentation for more information. */ 353 "SOS article 7", ' !! 407 multiboot_info_t *mbi = (multiboot_info_t *) arg; 354 (unsigned)(mbi->me !! 408 355 (unsigned)mbi->mem !! 409 /* Multiboot says: "The value returned for upper memory is >> 410 maximally the address of the first upper memory hole minus 1 >> 411 megabyte.". It also adds: "It is not guaranteed to be this >> 412 value." aka "YMMV" ;) */ >> 413 upper_mem = mbi->mem_upper; >> 414 sos_x86_videomem_printf(1, 0, >> 415 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 416 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 417 "SOS article 9.5", ',', >> 418 (unsigned)(upper_mem >> 10) + 1, >> 419 (unsigned)upper_mem); >> 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_YELLOW | SOS_X86_VIDEO_BG_BLUE, >> 427 "Welcome to %s%c RAM is %dMB (upper mem = 0x%x kB)", >> 428 "SOS article 9.5", ',', >> 429 (unsigned)(upper_mem >> 10) + 1, >> 430 (unsigned)upper_mem); >> 431 } 356 else 432 else 357 /* Not loaded with grub */ !! 433 /* Not loaded with grub, not from an enhanced bootsect */ 358 sos_x86_videomem_printf(1, 0, 434 sos_x86_videomem_printf(1, 0, 359 SOS_X86_VIDEO_FG_Y 435 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 360 "Welcome to SOS ar !! 436 "Welcome to SOS article 9.5"); 361 437 362 sos_bochs_putstring("Message in a bochs: Thi !! 438 sos_bochs_putstring("Message in a bochs: This is SOS article 9.5.\n"); 363 439 364 /* Setup CPU segmentation and IRQ subsystem 440 /* Setup CPU segmentation and IRQ subsystem */ 365 sos_gdt_subsystem_setup(); 441 sos_gdt_subsystem_setup(); 366 sos_idt_subsystem_setup(); 442 sos_idt_subsystem_setup(); 367 443 368 /* Setup SOS IRQs and exceptions subsystem * 444 /* Setup SOS IRQs and exceptions subsystem */ 369 sos_exception_subsystem_setup(); 445 sos_exception_subsystem_setup(); 370 sos_irq_subsystem_setup(); 446 sos_irq_subsystem_setup(); 371 447 372 /* Configure the timer so as to raise the IR 448 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 373 sos_i8254_set_frequency(100); 449 sos_i8254_set_frequency(100); 374 450 375 /* Setup the kernel time subsystem to get pr 451 /* Setup the kernel time subsystem to get prepared to take the timer 376 ticks into account */ 452 ticks into account */ 377 tick_resolution = (struct sos_time) { .sec=0 453 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 378 sos_time_subsysem_setup(& tick_resolution); 454 sos_time_subsysem_setup(& tick_resolution); 379 455 380 /* We need a multiboot-compliant boot loader !! 456 /* We need to know the RAM size */ 381 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) !! 457 if (upper_mem == 0) 382 { 458 { 383 sos_x86_videomem_putstring(20, 0, 459 sos_x86_videomem_putstring(20, 0, 384 SOS_X86_VIDEO 460 SOS_X86_VIDEO_FG_LTRED 385 | SOS_X86_V 461 | SOS_X86_VIDEO_BG_BLUE 386 | SOS_X86_V 462 | SOS_X86_VIDEO_FG_BLINKING, 387 "I'm not load !! 463 "I don't know RAM size ! Load me with Grub..."); 388 /* STOP ! */ 464 /* STOP ! */ 389 for (;;) 465 for (;;) 390 continue; 466 continue; 391 } 467 } 392 468 393 /* 469 /* 394 * Some interrupt handlers 470 * Some interrupt handlers 395 */ 471 */ 396 472 397 /* Binding some HW interrupts and exceptions 473 /* Binding some HW interrupts and exceptions to software routines */ 398 sos_irq_set_routine(SOS_IRQ_TIMER, 474 sos_irq_set_routine(SOS_IRQ_TIMER, 399 clk_it); 475 clk_it); 400 476 401 /* 477 /* 402 * Setup physical memory management 478 * Setup physical memory management 403 */ 479 */ 404 480 405 /* Multiboot says: "The value returned for u !! 481 SOS_ASSERT_FATAL(SOS_OK 406 the address of the first upper memory hol !! 482 == sos_physmem_subsystem_setup((upper_mem<<10) + (1<<20), 407 also adds: "It is not guaranteed to be th !! 483 &sos_kernel_core_base_paddr, 408 sos_physmem_subsystem_setup((mbi->mem_upper< !! 484 &sos_kernel_core_top_paddr)); 409 & sos_kernel_cor << 410 & sos_kernel_cor << 411 485 412 /* 486 /* 413 * Switch to paged-memory mode 487 * Switch to paged-memory mode 414 */ 488 */ 415 489 416 /* Disabling interrupts should seem more cor 490 /* Disabling interrupts should seem more correct, but it's not really 417 necessary at this stage */ 491 necessary at this stage */ 418 SOS_ASSERT_FATAL(SOS_OK == 492 SOS_ASSERT_FATAL(SOS_OK == 419 sos_paging_subsystem_setup( 493 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 420 494 sos_kernel_core_top_paddr)); 421 495 422 /* Bind the page fault exception */ 496 /* Bind the page fault exception */ 423 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 497 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 424 pgflt_ex); 498 pgflt_ex); 425 499 426 /* 500 /* 427 * Setup kernel virtual memory allocator 501 * Setup kernel virtual memory allocator 428 */ 502 */ 429 503 430 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 504 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 431 sos_kernel_ 505 sos_kernel_core_top_paddr, 432 bootstrap_s 506 bootstrap_stack_bottom, 433 bootstrap_s 507 bootstrap_stack_bottom 434 + bootstrap 508 + bootstrap_stack_size)) 435 sos_bochs_printf("Could not setup the Kern 509 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 436 510 437 if (sos_kmalloc_subsystem_setup()) 511 if (sos_kmalloc_subsystem_setup()) 438 sos_bochs_printf("Could not setup the Kmal 512 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 439 513 440 /* 514 /* 441 * Initialize the MMU context subsystem 515 * Initialize the MMU context subsystem 442 */ 516 */ 443 sos_mm_context_subsystem_setup(); 517 sos_mm_context_subsystem_setup(); 444 518 445 /* 519 /* 446 * Initialize the CPU context subsystem 520 * Initialize the CPU context subsystem 447 */ 521 */ 448 sos_cpu_context_subsystem_setup(); 522 sos_cpu_context_subsystem_setup(); 449 523 450 /* 524 /* 451 * Bind the syscall handler to its software 525 * Bind the syscall handler to its software interrupt handler 452 */ 526 */ 453 sos_swintr_subsystem_setup(); 527 sos_swintr_subsystem_setup(); 454 528 455 529 456 /* 530 /* 457 * Initialize the Kernel thread and schedule 531 * Initialize the Kernel thread and scheduler subsystems 458 */ 532 */ 459 533 460 /* Initialize kernel thread subsystem */ 534 /* Initialize kernel thread subsystem */ 461 sos_thread_subsystem_setup(bootstrap_stack_b 535 sos_thread_subsystem_setup(bootstrap_stack_bottom, 462 bootstrap_stack_s 536 bootstrap_stack_size); 463 537 464 /* Initialize the scheduler */ 538 /* Initialize the scheduler */ 465 sos_sched_subsystem_setup(); 539 sos_sched_subsystem_setup(); 466 540 467 /* Declare the IDLE thread */ 541 /* Declare the IDLE thread */ 468 SOS_ASSERT_FATAL(sos_create_kernel_thread("i 542 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, 469 SO 543 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 470 544 471 /* Prepare the stats subsystem */ 545 /* Prepare the stats subsystem */ 472 sos_load_subsystem_setup(); 546 sos_load_subsystem_setup(); 473 547 474 /* Declare a thread that prints some stats * 548 /* Declare a thread that prints some stats */ 475 SOS_ASSERT_FATAL(sos_create_kernel_thread("s 549 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, 476 NU 550 NULL, 477 SO 551 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 478 552 479 553 480 /* 554 /* >> 555 * Initialise user address space management subsystem >> 556 */ >> 557 sos_umem_vmm_subsystem_setup(); >> 558 sos_dev_zero_subsystem_setup(); >> 559 >> 560 /* Initialize the page and block cache subsystems */ >> 561 sos_fs_pagecache_subsystem_setup(); >> 562 sos_blockdev_subsystem_setup(); >> 563 sos_dev_mem_chardev_setup(); >> 564 >> 565 /* 481 * Initialize process stuff 566 * Initialize process stuff 482 */ 567 */ 483 sos_process_subsystem_setup(); 568 sos_process_subsystem_setup(); 484 569 485 570 486 /* Enabling the HW interrupts here, this wil 571 /* Enabling the HW interrupts here, this will make the timer HW 487 interrupt call the scheduler */ 572 interrupt call the scheduler */ 488 asm volatile ("sti\n"); 573 asm volatile ("sti\n"); 489 574 490 /* Run some tests involving USER processes a << 491 extern void test_art7(); << 492 test_art7(); << 493 << 494 /* Now run some Kernel threads just for fun << 495 extern void MouseSim(); << 496 MouseSim(); << 497 test_thread(); << 498 575 >> 576 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_subsystem_setup()); >> 577 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_setup(NULL, >> 578 "virtfs", >> 579 NULL, >> 580 & rootfs)); >> 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 >> 592 /* Start the 'init' process, which in turns launches the other >> 593 programs */ >> 594 start_init(rootfs); 499 /* 595 /* 500 * We can safely exit from this function now 596 * We can safely exit from this function now, for there is already 501 * an idle Kernel thread ready to make the C 597 * an idle Kernel thread ready to make the CPU busy working... 502 * 598 * 503 * However, we must EXPLICITELY call sos_thr 599 * However, we must EXPLICITELY call sos_thread_exit() because a 504 * simple "return" will return nowhere ! Act 600 * simple "return" will return nowhere ! Actually this first thread 505 * was initialized by the Grub bootstrap sta 601 * was initialized by the Grub bootstrap stage, at a time when the 506 * word "thread" did not exist. This means t 602 * word "thread" did not exist. This means that the stack was not 507 * setup in order for a return here to call 603 * setup in order for a return here to call sos_thread_exit() 508 * automagically. Hence we must call it manu 604 * automagically. Hence we must call it manually. This is the ONLY 509 * kernel thread where we must do this manua 605 * kernel thread where we must do this manually. 510 */ 606 */ 511 sos_bochs_printf("Bye from primary thread !\ 607 sos_bochs_printf("Bye from primary thread !\n"); 512 sos_thread_exit(); 608 sos_thread_exit(); 513 SOS_FATAL_ERROR("No trespassing !"); 609 SOS_FATAL_ERROR("No trespassing !"); 514 } 610 }
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