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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 #include <sos/blkdev.h> << 055 #include <sos/fs_pagecache.h> << 056 #include <drivers/ide.h> << 057 042 058 /* Helper function to display each bits of a 3 043 /* Helper function to display each bits of a 32bits integer on the 059 screen as dark or light carrets */ 044 screen as dark or light carrets */ 060 void display_bits(unsigned char row, unsigned 045 void display_bits(unsigned char row, unsigned char col, 061 unsigned char attribute, 046 unsigned char attribute, 062 sos_ui32_t integer) 047 sos_ui32_t integer) 063 { 048 { 064 int i; 049 int i; 065 /* Scan each bit of the integer, MSb first * 050 /* Scan each bit of the integer, MSb first */ 066 for (i = 31 ; i >= 0 ; i--) 051 for (i = 31 ; i >= 0 ; i--) 067 { 052 { 068 /* Test if bit i of 'integer' is set */ 053 /* Test if bit i of 'integer' is set */ 069 int bit_i = (integer & (1 << i)); 054 int bit_i = (integer & (1 << i)); 070 /* Ascii 219 => dark carret, Ascii 177 = 055 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 071 unsigned char ascii_code = bit_i?219:177 056 unsigned char ascii_code = bit_i?219:177; 072 sos_x86_videomem_putchar(row, col++, 057 sos_x86_videomem_putchar(row, col++, 073 attribute, 058 attribute, 074 ascii_code); 059 ascii_code); 075 } 060 } 076 } 061 } 077 062 >> 063 078 /* Clock IRQ handler */ 064 /* Clock IRQ handler */ 079 static void clk_it(int intid) 065 static void clk_it(int intid) 080 { 066 { 081 static sos_ui32_t clock_count = 0; 067 static sos_ui32_t clock_count = 0; 082 068 083 display_bits(0, 48, 069 display_bits(0, 48, 084 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 070 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 085 clock_count); 071 clock_count); 086 clock_count++; 072 clock_count++; 087 073 088 /* Execute the expired timeout actions (if a 074 /* Execute the expired timeout actions (if any) */ 089 sos_time_do_tick(); 075 sos_time_do_tick(); 090 076 091 /* Update scheduler statistics and status */ 077 /* Update scheduler statistics and status */ 092 sos_sched_do_timer_tick(); 078 sos_sched_do_timer_tick(); 093 } 079 } 094 080 095 081 096 /* =========================================== 082 /* ====================================================================== 097 * Page fault exception handling 083 * Page fault exception handling 098 */ 084 */ 099 085 100 086 101 /* Page fault exception handler with demand pa 087 /* Page fault exception handler with demand paging for the kernel */ 102 static void pgflt_ex(int intid, struct sos_cpu 088 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 103 { 089 { 104 static sos_ui32_t demand_paging_count = 0; 090 static sos_ui32_t demand_paging_count = 0; 105 struct sos_thread * cur_thr = sos_thread_get << 106 sos_vaddr_t faulting_vaddr = sos_cpu_contex 091 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 107 sos_paddr_t ppage_paddr; 092 sos_paddr_t ppage_paddr; 108 093 109 if (sos_cpu_context_is_in_user_mode(ctxt) !! 094 if (sos_cpu_context_is_in_user_mode(ctxt)) 110 || (cur_thr->fixup_uaccess.return_vaddr) << 111 { 095 { 112 __label__ unforce_address_space; !! 096 /* User-mode page faults are considered unresolved for the 113 sos_bool_t need_to_setup_mmu; !! 097 moment */ 114 sos_ui32_t errcode = sos_cpu_context_get !! 098 sos_bochs_printf("Unresolved USER page Fault at instruction 0x%x on access to address 0x%x (info=%x)!\n", 115 << 116 /* Make sure to always stay in the inter << 117 configuration */ << 118 need_to_setup_mmu = (cur_thr->squatted_m << 119 != sos_process_get_ << 120 if (need_to_setup_mmu) << 121 sos_thread_prepare_user_space_access(N << 122 << 123 if (SOS_OK == << 124 sos_umem_vmm_try_resolve_page_fault( << 125 << 126 << 127 goto unforce_address_space; << 128 << 129 /* If the page fault occured in kernel m << 130 the fixup address */ << 131 if (! sos_cpu_context_is_in_user_mode(ct << 132 { << 133 cur_thr->fixup_uaccess.faulted_uaddr << 134 sos_cpu_context_set_EX_return_addres << 135 << 136 goto unforce_address_space; << 137 } << 138 << 139 if (need_to_setup_mmu) << 140 sos_thread_end_user_space_access(); << 141 << 142 sos_bochs_printf("\e[35mTHR %p: Unresolv << 143 (void*)sos_thread_get_c << 144 sos_cpu_context_get_PC( 099 sos_cpu_context_get_PC(ctxt), 145 (unsigned)faulting_vadd 100 (unsigned)faulting_vaddr, 146 (unsigned)sos_cpu_conte 101 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 147 sos_bochs_printf("Terminating User threa 102 sos_bochs_printf("Terminating User thread\n"); 148 sos_thread_exit(); 103 sos_thread_exit(); 149 << 150 unforce_address_space: << 151 if (need_to_setup_mmu) << 152 sos_thread_end_user_space_access(); << 153 return; << 154 } 104 } 155 105 156 /* Check if address is covered by any VMM ra 106 /* Check if address is covered by any VMM range */ 157 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 107 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 158 { 108 { 159 /* No: The page fault is out of any kern 109 /* No: The page fault is out of any kernel virtual region. For 160 the moment, we don't handle this. */ 110 the moment, we don't handle this. */ 161 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)!", 162 sos_cpu_context_ 112 sos_cpu_context_get_PC(ctxt), 163 (unsigned)faulti 113 (unsigned)faulting_vaddr, 164 (unsigned)sos_cp 114 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 165 SOS_ASSERT_FATAL(! "Got page fault (note 115 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 166 } 116 } 167 117 168 118 169 /* 119 /* 170 * Demand paging in kernel space 120 * Demand paging in kernel space 171 */ 121 */ 172 122 173 /* Update the number of demand paging reques 123 /* Update the number of demand paging requests handled */ 174 demand_paging_count ++; 124 demand_paging_count ++; 175 display_bits(0, 0, 125 display_bits(0, 0, 176 SOS_X86_VIDEO_FG_LTRED | SOS_X8 126 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 177 demand_paging_count); 127 demand_paging_count); 178 128 179 /* Allocate a new page for the virtual addre 129 /* Allocate a new page for the virtual address */ 180 ppage_paddr = sos_physmem_ref_physpage_new(F 130 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 181 if (! ppage_paddr) 131 if (! ppage_paddr) 182 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 !)"); 183 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 133 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 184 SO 134 SOS_PAGE_ALIGN_INF(faulting_vaddr), 185 FA 135 FALSE, 186 SO 136 SOS_VM_MAP_PROT_READ 187 | 137 | SOS_VM_MAP_PROT_WRITE 188 | 138 | SOS_VM_MAP_ATOMIC)); 189 sos_physmem_unref_physpage(ppage_paddr); 139 sos_physmem_unref_physpage(ppage_paddr); 190 140 191 /* Ok, we can now return to interrupted cont 141 /* Ok, we can now return to interrupted context */ 192 } 142 } 193 143 194 144 >> 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 } >> 240 195 241 196 /* =========================================== 242 /* ====================================================================== 197 * An operating system MUST always have a read 243 * An operating system MUST always have a ready thread ! Otherwise: 198 * what would the CPU have to execute ?! 244 * what would the CPU have to execute ?! 199 */ 245 */ 200 static void idle_thread(void* unused) __attrib !! 246 static void idle_thread() 201 static void idle_thread(void* unused) << 202 { 247 { 203 sos_ui32_t idle_twiddle = 0; 248 sos_ui32_t idle_twiddle = 0; 204 249 205 while (1) 250 while (1) 206 { 251 { 207 /* Remove this instruction if you get an 252 /* Remove this instruction if you get an "Invalid opcode" CPU 208 exception (old 80386 CPU) */ 253 exception (old 80386 CPU) */ 209 asm("hlt\n"); 254 asm("hlt\n"); 210 255 211 idle_twiddle ++; 256 idle_twiddle ++; 212 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE 257 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 213 idle_twiddle); 258 idle_twiddle); 214 259 215 /* Lend the CPU to some other thread */ 260 /* Lend the CPU to some other thread */ 216 sos_thread_yield(); 261 sos_thread_yield(); 217 } 262 } 218 } 263 } 219 264 220 265 221 /* =========================================== 266 /* ====================================================================== 222 * Kernel thread showing some CPU usage statis 267 * Kernel thread showing some CPU usage statistics on the console every 1s 223 */ 268 */ 224 #define LOAD_DISPLAY_BASELINE 4 !! 269 static void stat_thread() 225 #define LOAD_DISPLAY_STARTROW 34 << 226 static void stat_thread(void * unused) __attri << 227 static void stat_thread(void * unused) << 228 { 270 { 229 while (1) 271 while (1) 230 { 272 { 231 sos_ui32_t flags; 273 sos_ui32_t flags; 232 sos_ui32_t load1, load5, load15; 274 sos_ui32_t load1, load5, load15; 233 char str1[11], str5[11], str15[11]; 275 char str1[11], str5[11], str15[11]; 234 struct sos_time t; 276 struct sos_time t; 235 t.sec = 1; 277 t.sec = 1; 236 t.nanosec = 0; 278 t.nanosec = 0; 237 279 238 sos_thread_sleep(& t); 280 sos_thread_sleep(& t); 239 281 240 sos_disable_IRQs(flags); 282 sos_disable_IRQs(flags); 241 283 242 /* The IDLE task is EXcluded in the foll 284 /* The IDLE task is EXcluded in the following computation */ 243 sos_load_get_sload(&load1, &load5, &load 285 sos_load_get_sload(&load1, &load5, &load15); 244 sos_load_to_string(str1, load1); 286 sos_load_to_string(str1, load1); 245 sos_load_to_string(str5, load5); 287 sos_load_to_string(str5, load5); 246 sos_load_to_string(str15, load15); 288 sos_load_to_string(str15, load15); 247 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 289 sos_x86_videomem_printf(16, 34, 248 SOS_X86_VIDEO_FG 290 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 249 "Kernel (- Idle) 291 "Kernel (- Idle): %s %s %s ", 250 str1, str5, str1 292 str1, str5, str15); 251 293 252 sos_load_get_uload(&load1, &load5, &load 294 sos_load_get_uload(&load1, &load5, &load15); 253 sos_load_to_string(str1, load1); 295 sos_load_to_string(str1, load1); 254 sos_load_to_string(str5, load5); 296 sos_load_to_string(str5, load5); 255 sos_load_to_string(str15, load15); 297 sos_load_to_string(str15, load15); 256 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 298 sos_x86_videomem_printf(17, 34, 257 SOS_X86_VIDEO_FG 299 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 258 "User: %s %s %s 300 "User: %s %s %s ", 259 str1, str5, str1 301 str1, str5, str15); 260 302 261 sos_load_get_uratio(&load1, &load5, &loa 303 sos_load_get_uratio(&load1, &load5, &load15); 262 sos_load_to_string(str1, load1); 304 sos_load_to_string(str1, load1); 263 sos_load_to_string(str5, load5); 305 sos_load_to_string(str5, load5); 264 sos_load_to_string(str15, load15); 306 sos_load_to_string(str15, load15); 265 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 307 sos_x86_videomem_printf(18, 34, 266 SOS_X86_VIDEO_FG 308 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 267 "User CPU %%: %s 309 "User CPU %%: %s %s %s ", 268 str1, str5, str1 310 str1, str5, str15); 269 311 270 /* The IDLE task is INcluded in the foll 312 /* The IDLE task is INcluded in the following computation */ 271 sos_load_get_sratio(&load1, &load5, &loa 313 sos_load_get_sratio(&load1, &load5, &load15); 272 sos_load_to_string(str1, load1); 314 sos_load_to_string(str1, load1); 273 sos_load_to_string(str5, load5); 315 sos_load_to_string(str5, load5); 274 sos_load_to_string(str15, load15); 316 sos_load_to_string(str15, load15); 275 sos_x86_videomem_printf(LOAD_DISPLAY_BAS !! 317 sos_x86_videomem_printf(19, 34, 276 SOS_X86_VIDEO_FG 318 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 277 "Kernel CPU %% ( 319 "Kernel CPU %% (+ Idle): %s %s %s ", 278 str1, str5, str1 320 str1, str5, str15); 279 sos_restore_IRQs(flags); 321 sos_restore_IRQs(flags); 280 } 322 } 281 } 323 } 282 324 283 325 284 /* =========================================== 326 /* ====================================================================== 285 * Start the "init" (userland) process << 286 */ << 287 static sos_ret_t << 288 start_init(struct sos_fs_manager_instance * ro << 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, * ini << 296 << 297 /* Create the new process */ << 298 proc_init = sos_process_create("init", FALSE << 299 if (! proc_init) << 300 return -SOS_ENOMEM; << 301 as_init = sos_process_get_address_space(proc << 302 << 303 << 304 /* << 305 * Setup the root and CWD directories of the << 306 * this process will correspond to the "glob << 307 * system since all the future processes wil << 308 */ << 309 retval = sos_fs_new_opened_file(proc_init, r << 310 SOS_FS_OPEN_ << 311 & init_root) << 312 if (SOS_OK != retval) << 313 { << 314 sos_process_unref(proc_init); << 315 return -SOS_ENOENT; << 316 } << 317 << 318 /* Duplicate the root file to set the curren << 319 the init process */ << 320 retval = sos_fs_duplicate_opened_file(init_r << 321 & init << 322 if (SOS_OK != retval) << 323 { << 324 sos_fs_close(init_root); << 325 sos_process_unref(proc_init); << 326 return -SOS_ENOENT; << 327 } << 328 << 329 /* Now update the process ! */ << 330 if ( ( SOS_OK != sos_process_chroot(proc_ini << 331 || ( SOS_OK != sos_process_chdir(proc_i << 332 { << 333 sos_fs_close(init_root); << 334 sos_fs_close(init_cwd); << 335 sos_process_chroot(proc_init, NULL, & un << 336 sos_process_chdir(proc_init, NULL, & unu << 337 sos_process_unref(proc_init); << 338 return -SOS_ENOENT; << 339 } << 340 << 341 << 342 << 343 /* Map the 'init' program in user space */ << 344 start_uaddr = sos_binfmt_elf32_map(as_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_ << 353 retval = sos_dev_zero_map(as_init, &ustack, << 354 SOS_VM_MAP_PROT_RE << 355 /* PRIVATE */ 0); << 356 if (SOS_OK != retval) << 357 { << 358 sos_process_unref(proc_init); << 359 return -SOS_ENOMEM; << 360 } << 361 << 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 + SO << 368 SOS_SCHED_P << 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 /* =========================================== << 382 * The C entry point of our operating system 327 * The C entry point of our operating system 383 */ 328 */ 384 void sos_main(unsigned long magic, unsigned lo !! 329 void sos_main(unsigned long magic, unsigned long addr) 385 __attribute__((noreturn)); << 386 void sos_main(unsigned long magic, unsigned lo << 387 { 330 { >> 331 unsigned i; 388 sos_paddr_t sos_kernel_core_base_paddr, sos_ 332 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 389 struct sos_time tick_resolution; 333 struct sos_time tick_resolution; 390 struct sos_fs_manager_instance * rootfs; << 391 334 392 /* Size of RAM above 1MB. Might be undefined !! 335 /* Grub sends us a structure, called multiboot_info_t with a lot of 393 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; 394 340 395 /* Setup bochs and console, and clear the co 341 /* Setup bochs and console, and clear the console */ 396 sos_bochs_subsystem_setup(); !! 342 sos_bochs_setup(); 397 343 398 sos_x86_videomem_setup(); 344 sos_x86_videomem_setup(); 399 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 345 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 400 346 401 /* Greetings from SOS */ 347 /* Greetings from SOS */ 402 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 348 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 403 { !! 349 /* Loaded with Grub */ 404 /* Grub sends us a structure, called mul !! 350 sos_x86_videomem_printf(1, 0, 405 precious informations about the syste !! 351 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 406 documentation for more information. * !! 352 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 407 multiboot_info_t *mbi = (multiboot_info_ !! 353 "SOS article 7", ',', 408 !! 354 (unsigned)(mbi->mem_upper >> 10) + 1, 409 /* Multiboot says: "The value returned f !! 355 (unsigned)mbi->mem_upper); 410 maximally the address of the first up << 411 megabyte.". It also adds: "It is not << 412 value." aka "YMMV" ;) */ << 413 upper_mem = mbi->mem_upper; << 414 sos_x86_videomem_printf(1, 0, << 415 SOS_X86_VIDEO_FG << 416 "Welcome From GR << 417 "SOS article 9.5 << 418 (unsigned)(upper << 419 (unsigned)upper_ << 420 } << 421 else if (magic == 0x42244224) << 422 { << 423 /* Loaded with SOS bootsect */ << 424 upper_mem = arg; << 425 sos_x86_videomem_printf(1, 0, << 426 SOS_X86_VIDEO_FG << 427 "Welcome to %s%c << 428 "SOS article 9.5 << 429 (unsigned)(upper << 430 (unsigned)upper_ << 431 } << 432 else 356 else 433 /* Not loaded with grub, not from an enhan !! 357 /* Not loaded with grub */ 434 sos_x86_videomem_printf(1, 0, 358 sos_x86_videomem_printf(1, 0, 435 SOS_X86_VIDEO_FG_Y 359 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 436 "Welcome to SOS ar !! 360 "Welcome to SOS article 7"); 437 361 438 sos_bochs_putstring("Message in a bochs: Thi !! 362 sos_bochs_putstring("Message in a bochs: This is SOS article 7.\n"); 439 363 440 /* Setup CPU segmentation and IRQ subsystem 364 /* Setup CPU segmentation and IRQ subsystem */ 441 sos_gdt_subsystem_setup(); 365 sos_gdt_subsystem_setup(); 442 sos_idt_subsystem_setup(); 366 sos_idt_subsystem_setup(); 443 367 444 /* Setup SOS IRQs and exceptions subsystem * 368 /* Setup SOS IRQs and exceptions subsystem */ 445 sos_exception_subsystem_setup(); 369 sos_exception_subsystem_setup(); 446 sos_irq_subsystem_setup(); 370 sos_irq_subsystem_setup(); 447 371 448 /* Configure the timer so as to raise the IR 372 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 449 sos_i8254_set_frequency(100); 373 sos_i8254_set_frequency(100); 450 374 451 /* Setup the kernel time subsystem to get pr 375 /* Setup the kernel time subsystem to get prepared to take the timer 452 ticks into account */ 376 ticks into account */ 453 tick_resolution = (struct sos_time) { .sec=0 377 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 454 sos_time_subsysem_setup(& tick_resolution); 378 sos_time_subsysem_setup(& tick_resolution); 455 379 456 /* We need to know the RAM size */ !! 380 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 457 if (upper_mem == 0) !! 381 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 458 { 382 { 459 sos_x86_videomem_putstring(20, 0, 383 sos_x86_videomem_putstring(20, 0, 460 SOS_X86_VIDEO 384 SOS_X86_VIDEO_FG_LTRED 461 | SOS_X86_V 385 | SOS_X86_VIDEO_BG_BLUE 462 | SOS_X86_V 386 | SOS_X86_VIDEO_FG_BLINKING, 463 "I don't know !! 387 "I'm not loaded with Grub !"); 464 /* STOP ! */ 388 /* STOP ! */ 465 for (;;) 389 for (;;) 466 continue; 390 continue; 467 } 391 } 468 392 469 /* 393 /* 470 * Some interrupt handlers 394 * Some interrupt handlers 471 */ 395 */ 472 396 473 /* Binding some HW interrupts and exceptions 397 /* Binding some HW interrupts and exceptions to software routines */ 474 sos_irq_set_routine(SOS_IRQ_TIMER, 398 sos_irq_set_routine(SOS_IRQ_TIMER, 475 clk_it); 399 clk_it); 476 400 477 /* 401 /* 478 * Setup physical memory management 402 * Setup physical memory management 479 */ 403 */ 480 404 481 SOS_ASSERT_FATAL(SOS_OK !! 405 /* Multiboot says: "The value returned for upper memory is maximally 482 == sos_physmem_subsystem_se !! 406 the address of the first upper memory hole minus 1 megabyte.". It 483 !! 407 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 484 !! 408 sos_physmem_subsystem_setup((mbi->mem_upper<<10) + (1<<20), >> 409 & sos_kernel_core_base_paddr, >> 410 & sos_kernel_core_top_paddr); 485 411 486 /* 412 /* 487 * Switch to paged-memory mode 413 * Switch to paged-memory mode 488 */ 414 */ 489 415 490 /* Disabling interrupts should seem more cor 416 /* Disabling interrupts should seem more correct, but it's not really 491 necessary at this stage */ 417 necessary at this stage */ 492 SOS_ASSERT_FATAL(SOS_OK == 418 SOS_ASSERT_FATAL(SOS_OK == 493 sos_paging_subsystem_setup( 419 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 494 420 sos_kernel_core_top_paddr)); 495 421 496 /* Bind the page fault exception */ 422 /* Bind the page fault exception */ 497 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 423 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 498 pgflt_ex); 424 pgflt_ex); 499 425 500 /* 426 /* 501 * Setup kernel virtual memory allocator 427 * Setup kernel virtual memory allocator 502 */ 428 */ 503 429 504 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 430 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 505 sos_kernel_ 431 sos_kernel_core_top_paddr, 506 bootstrap_s 432 bootstrap_stack_bottom, 507 bootstrap_s 433 bootstrap_stack_bottom 508 + bootstrap 434 + bootstrap_stack_size)) 509 sos_bochs_printf("Could not setup the Kern 435 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 510 436 511 if (sos_kmalloc_subsystem_setup()) 437 if (sos_kmalloc_subsystem_setup()) 512 sos_bochs_printf("Could not setup the Kmal 438 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 513 439 514 /* 440 /* 515 * Initialize the MMU context subsystem 441 * Initialize the MMU context subsystem 516 */ 442 */ 517 sos_mm_context_subsystem_setup(); 443 sos_mm_context_subsystem_setup(); 518 444 519 /* 445 /* 520 * Initialize the CPU context subsystem 446 * Initialize the CPU context subsystem 521 */ 447 */ 522 sos_cpu_context_subsystem_setup(); 448 sos_cpu_context_subsystem_setup(); 523 449 524 /* 450 /* 525 * Bind the syscall handler to its software 451 * Bind the syscall handler to its software interrupt handler 526 */ 452 */ 527 sos_swintr_subsystem_setup(); 453 sos_swintr_subsystem_setup(); 528 454 529 455 530 /* 456 /* 531 * Initialize the Kernel thread and schedule 457 * Initialize the Kernel thread and scheduler subsystems 532 */ 458 */ 533 459 534 /* Initialize kernel thread subsystem */ 460 /* Initialize kernel thread subsystem */ 535 sos_thread_subsystem_setup(bootstrap_stack_b 461 sos_thread_subsystem_setup(bootstrap_stack_bottom, 536 bootstrap_stack_s 462 bootstrap_stack_size); 537 463 538 /* Initialize the scheduler */ 464 /* Initialize the scheduler */ 539 sos_sched_subsystem_setup(); 465 sos_sched_subsystem_setup(); 540 466 541 /* Declare the IDLE thread */ 467 /* Declare the IDLE thread */ 542 SOS_ASSERT_FATAL(sos_create_kernel_thread("i 468 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, 543 SO 469 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 544 470 545 /* Prepare the stats subsystem */ 471 /* Prepare the stats subsystem */ 546 sos_load_subsystem_setup(); 472 sos_load_subsystem_setup(); 547 473 548 /* Declare a thread that prints some stats * 474 /* Declare a thread that prints some stats */ 549 SOS_ASSERT_FATAL(sos_create_kernel_thread("s 475 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, 550 NU 476 NULL, 551 SO 477 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 552 478 553 479 554 /* 480 /* 555 * Initialise user address space management << 556 */ << 557 sos_umem_vmm_subsystem_setup(); << 558 sos_dev_zero_subsystem_setup(); << 559 << 560 /* Initialize the page and block cache subsy << 561 sos_fs_pagecache_subsystem_setup(); << 562 sos_blockdev_subsystem_setup(); << 563 sos_dev_mem_chardev_setup(); << 564 << 565 /* << 566 * Initialize process stuff 481 * Initialize process stuff 567 */ 482 */ 568 sos_process_subsystem_setup(); 483 sos_process_subsystem_setup(); 569 484 570 485 571 /* Enabling the HW interrupts here, this wil 486 /* Enabling the HW interrupts here, this will make the timer HW 572 interrupt call the scheduler */ 487 interrupt call the scheduler */ 573 asm volatile ("sti\n"); 488 asm volatile ("sti\n"); 574 489 >> 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(); 575 498 576 SOS_ASSERT_FATAL(SOS_OK == sos_fs_virtfs_sub << 577 SOS_ASSERT_FATAL(SOS_OK == sos_fs_subsystem_ << 578 << 579 << 580 << 581 << 582 << 583 tty_subsystem_setup(); << 584 sos_ttyS0_subsystem_setup(); << 585 sos_console_subsystem_setup(); << 586 << 587 << 588 sos_ide_subsystem_setup(); << 589 << 590 << 591 << 592 /* Start the 'init' process, which in turns << 593 programs */ << 594 start_init(rootfs); << 595 /* 499 /* 596 * We can safely exit from this function now 500 * We can safely exit from this function now, for there is already 597 * an idle Kernel thread ready to make the C 501 * an idle Kernel thread ready to make the CPU busy working... 598 * 502 * 599 * However, we must EXPLICITELY call sos_thr 503 * However, we must EXPLICITELY call sos_thread_exit() because a 600 * simple "return" will return nowhere ! Act 504 * simple "return" will return nowhere ! Actually this first thread 601 * was initialized by the Grub bootstrap sta 505 * was initialized by the Grub bootstrap stage, at a time when the 602 * word "thread" did not exist. This means t 506 * word "thread" did not exist. This means that the stack was not 603 * setup in order for a return here to call 507 * setup in order for a return here to call sos_thread_exit() 604 * automagically. Hence we must call it manu 508 * automagically. Hence we must call it manually. This is the ONLY 605 * kernel thread where we must do this manua 509 * kernel thread where we must do this manually. 606 */ 510 */ 607 sos_bochs_printf("Bye from primary thread !\ 511 sos_bochs_printf("Bye from primary thread !\n"); 608 sos_thread_exit(); 512 sos_thread_exit(); 609 SOS_FATAL_ERROR("No trespassing !"); 513 SOS_FATAL_ERROR("No trespassing !"); 610 } 514 }
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