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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 definitions of the multiboot standa 019 /* Include definitions of the multiboot standard */ 020 #include <bootstrap/multiboot.h> 020 #include <bootstrap/multiboot.h> 021 #include <hwcore/idt.h> 021 #include <hwcore/idt.h> 022 #include <hwcore/gdt.h> 022 #include <hwcore/gdt.h> 023 #include <hwcore/irq.h> 023 #include <hwcore/irq.h> 024 #include <hwcore/exception.h> 024 #include <hwcore/exception.h> 025 #include <hwcore/i8254.h> 025 #include <hwcore/i8254.h> 026 #include <sos/list.h> 026 #include <sos/list.h> 027 #include <sos/physmem.h> 027 #include <sos/physmem.h> 028 #include <hwcore/paging.h> 028 #include <hwcore/paging.h> 029 #include <hwcore/mm_context.h> 029 #include <hwcore/mm_context.h> 030 #include <hwcore/swintr.h> 030 #include <hwcore/swintr.h> 031 #include <sos/kmem_vmm.h> 031 #include <sos/kmem_vmm.h> 032 #include <sos/kmalloc.h> 032 #include <sos/kmalloc.h> 033 #include <sos/time.h> 033 #include <sos/time.h> 034 #include <sos/thread.h> 034 #include <sos/thread.h> 035 #include <sos/process.h> 035 #include <sos/process.h> 036 #include <sos/umem_vmm.h> << 037 #include <sos/klibc.h> 036 #include <sos/klibc.h> 038 #include <sos/assert.h> 037 #include <sos/assert.h> 039 #include <drivers/x86_videomem.h> 038 #include <drivers/x86_videomem.h> 040 #include <drivers/bochs.h> 039 #include <drivers/bochs.h> 041 #include <sos/calcload.h> 040 #include <sos/calcload.h> 042 #include <sos/umem_vmm.h> << 043 #include <sos/binfmt_elf32.h> << 044 #include <drivers/zero.h> << 045 041 046 042 047 /* Helper function to display each bits of a 3 043 /* Helper function to display each bits of a 32bits integer on the 048 screen as dark or light carrets */ 044 screen as dark or light carrets */ 049 void display_bits(unsigned char row, unsigned 045 void display_bits(unsigned char row, unsigned char col, 050 unsigned char attribute, 046 unsigned char attribute, 051 sos_ui32_t integer) 047 sos_ui32_t integer) 052 { 048 { 053 int i; 049 int i; 054 /* Scan each bit of the integer, MSb first * 050 /* Scan each bit of the integer, MSb first */ 055 for (i = 31 ; i >= 0 ; i--) 051 for (i = 31 ; i >= 0 ; i--) 056 { 052 { 057 /* Test if bit i of 'integer' is set */ 053 /* Test if bit i of 'integer' is set */ 058 int bit_i = (integer & (1 << i)); 054 int bit_i = (integer & (1 << i)); 059 /* Ascii 219 => dark carret, Ascii 177 = 055 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 060 unsigned char ascii_code = bit_i?219:177 056 unsigned char ascii_code = bit_i?219:177; 061 sos_x86_videomem_putchar(row, col++, 057 sos_x86_videomem_putchar(row, col++, 062 attribute, 058 attribute, 063 ascii_code); 059 ascii_code); 064 } 060 } 065 } 061 } 066 062 067 063 068 /* Clock IRQ handler */ 064 /* Clock IRQ handler */ 069 static void clk_it(int intid) 065 static void clk_it(int intid) 070 { 066 { 071 static sos_ui32_t clock_count = 0; 067 static sos_ui32_t clock_count = 0; 072 068 073 display_bits(0, 48, 069 display_bits(0, 48, 074 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 070 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 075 clock_count); 071 clock_count); 076 clock_count++; 072 clock_count++; 077 073 078 /* Execute the expired timeout actions (if a 074 /* Execute the expired timeout actions (if any) */ 079 sos_time_do_tick(); 075 sos_time_do_tick(); 080 076 081 /* Update scheduler statistics and status */ 077 /* Update scheduler statistics and status */ 082 sos_sched_do_timer_tick(); 078 sos_sched_do_timer_tick(); 083 } 079 } 084 080 085 081 086 /* =========================================== 082 /* ====================================================================== 087 * Page fault exception handling 083 * Page fault exception handling 088 */ 084 */ 089 085 090 086 091 /* Page fault exception handler with demand pa 087 /* Page fault exception handler with demand paging for the kernel */ 092 static void pgflt_ex(int intid, struct sos_cpu 088 static void pgflt_ex(int intid, struct sos_cpu_state *ctxt) 093 { 089 { 094 static sos_ui32_t demand_paging_count = 0; 090 static sos_ui32_t demand_paging_count = 0; 095 struct sos_thread * cur_thr = sos_thread_get << 096 sos_vaddr_t faulting_vaddr = sos_cpu_contex 091 sos_vaddr_t faulting_vaddr = sos_cpu_context_get_EX_faulting_vaddr(ctxt); 097 sos_paddr_t ppage_paddr; 092 sos_paddr_t ppage_paddr; 098 093 099 if (sos_cpu_context_is_in_user_mode(ctxt) !! 094 if (sos_cpu_context_is_in_user_mode(ctxt)) 100 || (cur_thr->fixup_uaccess.return_vaddr) << 101 { 095 { 102 __label__ unforce_address_space; !! 096 /* User-mode page faults are considered unresolved for the 103 sos_bool_t need_to_setup_mmu; !! 097 moment */ 104 sos_ui32_t errcode = sos_cpu_context_get << 105 << 106 /* Make sure to always stay in the inter << 107 configuration */ << 108 need_to_setup_mmu = (cur_thr->squatted_m << 109 != sos_process_get_ << 110 if (need_to_setup_mmu) << 111 sos_thread_prepare_user_space_access(N << 112 << 113 if (SOS_OK == << 114 sos_umem_vmm_try_resolve_page_fault( << 115 << 116 << 117 goto unforce_address_space; << 118 << 119 /* If the page fault occured in kernel m << 120 the fixup address */ << 121 if (! sos_cpu_context_is_in_user_mode(ct << 122 { << 123 cur_thr->fixup_uaccess.faulted_uaddr << 124 sos_cpu_context_set_EX_return_addres << 125 << 126 goto unforce_address_space; << 127 } << 128 << 129 if (need_to_setup_mmu) << 130 sos_thread_end_user_space_access(); << 131 << 132 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", 133 sos_cpu_context_get_PC( 099 sos_cpu_context_get_PC(ctxt), 134 (unsigned)faulting_vadd 100 (unsigned)faulting_vaddr, 135 (unsigned)sos_cpu_conte 101 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 136 sos_bochs_printf("Terminating User threa 102 sos_bochs_printf("Terminating User thread\n"); 137 sos_thread_exit(); 103 sos_thread_exit(); 138 << 139 unforce_address_space: << 140 if (need_to_setup_mmu) << 141 sos_thread_end_user_space_access(); << 142 return; << 143 } 104 } 144 105 145 /* Check if address is covered by any VMM ra 106 /* Check if address is covered by any VMM range */ 146 if (! sos_kmem_vmm_is_valid_vaddr(faulting_v 107 if (! sos_kmem_vmm_is_valid_vaddr(faulting_vaddr)) 147 { 108 { 148 /* No: The page fault is out of any kern 109 /* No: The page fault is out of any kernel virtual region. For 149 the moment, we don't handle this. */ 110 the moment, we don't handle this. */ 150 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)!", 151 sos_cpu_context_ 112 sos_cpu_context_get_PC(ctxt), 152 (unsigned)faulti 113 (unsigned)faulting_vaddr, 153 (unsigned)sos_cp 114 (unsigned)sos_cpu_context_get_EX_info(ctxt)); 154 SOS_ASSERT_FATAL(! "Got page fault (note 115 SOS_ASSERT_FATAL(! "Got page fault (note: demand paging is disabled)"); 155 } 116 } 156 117 157 118 158 /* 119 /* 159 * Demand paging in kernel space 120 * Demand paging in kernel space 160 */ 121 */ 161 122 162 /* Update the number of demand paging reques 123 /* Update the number of demand paging requests handled */ 163 demand_paging_count ++; 124 demand_paging_count ++; 164 display_bits(0, 0, 125 display_bits(0, 0, 165 SOS_X86_VIDEO_FG_LTRED | SOS_X8 126 SOS_X86_VIDEO_FG_LTRED | SOS_X86_VIDEO_BG_BLUE, 166 demand_paging_count); 127 demand_paging_count); 167 128 168 /* Allocate a new page for the virtual addre 129 /* Allocate a new page for the virtual address */ 169 ppage_paddr = sos_physmem_ref_physpage_new(F 130 ppage_paddr = sos_physmem_ref_physpage_new(FALSE); 170 if (! ppage_paddr) 131 if (! ppage_paddr) 171 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 !)"); 172 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(pp 133 SOS_ASSERT_FATAL(SOS_OK == sos_paging_map(ppage_paddr, 173 SO 134 SOS_PAGE_ALIGN_INF(faulting_vaddr), 174 FA 135 FALSE, 175 SO 136 SOS_VM_MAP_PROT_READ 176 | 137 | SOS_VM_MAP_PROT_WRITE 177 | 138 | SOS_VM_MAP_ATOMIC)); 178 sos_physmem_unref_physpage(ppage_paddr); 139 sos_physmem_unref_physpage(ppage_paddr); 179 140 180 /* Ok, we can now return to interrupted cont 141 /* Ok, we can now return to interrupted context */ 181 } 142 } 182 143 183 144 >> 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 } >> 240 184 241 185 /* =========================================== 242 /* ====================================================================== 186 * An operating system MUST always have a read 243 * An operating system MUST always have a ready thread ! Otherwise: 187 * what would the CPU have to execute ?! 244 * what would the CPU have to execute ?! 188 */ 245 */ 189 static void idle_thread() 246 static void idle_thread() 190 { 247 { 191 sos_ui32_t idle_twiddle = 0; 248 sos_ui32_t idle_twiddle = 0; 192 249 193 while (1) 250 while (1) 194 { 251 { 195 /* Remove this instruction if you get an 252 /* Remove this instruction if you get an "Invalid opcode" CPU 196 exception (old 80386 CPU) */ 253 exception (old 80386 CPU) */ 197 asm("hlt\n"); 254 asm("hlt\n"); 198 255 199 idle_twiddle ++; 256 idle_twiddle ++; 200 display_bits(0, 0, SOS_X86_VIDEO_FG_GREE 257 display_bits(0, 0, SOS_X86_VIDEO_FG_GREEN | SOS_X86_VIDEO_BG_BLUE, 201 idle_twiddle); 258 idle_twiddle); 202 259 203 /* Lend the CPU to some other thread */ 260 /* Lend the CPU to some other thread */ 204 sos_thread_yield(); 261 sos_thread_yield(); 205 } 262 } 206 } 263 } 207 264 208 265 209 /* =========================================== 266 /* ====================================================================== 210 * Kernel thread showing some CPU usage statis 267 * Kernel thread showing some CPU usage statistics on the console every 1s 211 */ 268 */ 212 static void stat_thread() 269 static void stat_thread() 213 { 270 { 214 while (1) 271 while (1) 215 { 272 { 216 sos_ui32_t flags; 273 sos_ui32_t flags; 217 sos_ui32_t load1, load5, load15; 274 sos_ui32_t load1, load5, load15; 218 char str1[11], str5[11], str15[11]; 275 char str1[11], str5[11], str15[11]; 219 struct sos_time t; 276 struct sos_time t; 220 t.sec = 1; 277 t.sec = 1; 221 t.nanosec = 0; 278 t.nanosec = 0; 222 279 223 sos_thread_sleep(& t); 280 sos_thread_sleep(& t); 224 281 225 sos_disable_IRQs(flags); 282 sos_disable_IRQs(flags); 226 283 227 /* The IDLE task is EXcluded in the foll 284 /* The IDLE task is EXcluded in the following computation */ 228 sos_load_get_sload(&load1, &load5, &load 285 sos_load_get_sload(&load1, &load5, &load15); 229 sos_load_to_string(str1, load1); 286 sos_load_to_string(str1, load1); 230 sos_load_to_string(str5, load5); 287 sos_load_to_string(str5, load5); 231 sos_load_to_string(str15, load15); 288 sos_load_to_string(str15, load15); 232 sos_x86_videomem_printf(16, 34, 289 sos_x86_videomem_printf(16, 34, 233 SOS_X86_VIDEO_FG 290 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 234 "Kernel (- Idle) 291 "Kernel (- Idle): %s %s %s ", 235 str1, str5, str1 292 str1, str5, str15); 236 293 237 sos_load_get_uload(&load1, &load5, &load 294 sos_load_get_uload(&load1, &load5, &load15); 238 sos_load_to_string(str1, load1); 295 sos_load_to_string(str1, load1); 239 sos_load_to_string(str5, load5); 296 sos_load_to_string(str5, load5); 240 sos_load_to_string(str15, load15); 297 sos_load_to_string(str15, load15); 241 sos_x86_videomem_printf(17, 34, 298 sos_x86_videomem_printf(17, 34, 242 SOS_X86_VIDEO_FG 299 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 243 "User: %s %s %s 300 "User: %s %s %s ", 244 str1, str5, str1 301 str1, str5, str15); 245 302 246 sos_load_get_uratio(&load1, &load5, &loa 303 sos_load_get_uratio(&load1, &load5, &load15); 247 sos_load_to_string(str1, load1); 304 sos_load_to_string(str1, load1); 248 sos_load_to_string(str5, load5); 305 sos_load_to_string(str5, load5); 249 sos_load_to_string(str15, load15); 306 sos_load_to_string(str15, load15); 250 sos_x86_videomem_printf(18, 34, 307 sos_x86_videomem_printf(18, 34, 251 SOS_X86_VIDEO_FG 308 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 252 "User CPU %%: %s 309 "User CPU %%: %s %s %s ", 253 str1, str5, str1 310 str1, str5, str15); 254 311 255 /* The IDLE task is INcluded in the foll 312 /* The IDLE task is INcluded in the following computation */ 256 sos_load_get_sratio(&load1, &load5, &loa 313 sos_load_get_sratio(&load1, &load5, &load15); 257 sos_load_to_string(str1, load1); 314 sos_load_to_string(str1, load1); 258 sos_load_to_string(str5, load5); 315 sos_load_to_string(str5, load5); 259 sos_load_to_string(str15, load15); 316 sos_load_to_string(str15, load15); 260 sos_x86_videomem_printf(19, 34, 317 sos_x86_videomem_printf(19, 34, 261 SOS_X86_VIDEO_FG 318 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 262 "Kernel CPU %% ( 319 "Kernel CPU %% (+ Idle): %s %s %s ", 263 str1, str5, str1 320 str1, str5, str15); 264 sos_restore_IRQs(flags); 321 sos_restore_IRQs(flags); 265 } 322 } 266 } 323 } 267 324 268 325 269 /* =========================================== 326 /* ====================================================================== 270 * Start the "init" (userland) process << 271 */ << 272 static sos_ret_t start_init() << 273 { << 274 sos_ret_t retval; << 275 struct sos_umem_vmm_as *as_init; << 276 struct sos_process *proc_init; << 277 struct sos_thread *new_thr; << 278 sos_uaddr_t ustack, start_uaddr; << 279 << 280 /* Create the new process */ << 281 proc_init = sos_process_create("init", FALSE << 282 if (! proc_init) << 283 return -SOS_ENOMEM; << 284 as_init = sos_process_get_address_space(proc << 285 << 286 /* Map the 'init' program in user space */ << 287 start_uaddr = sos_binfmt_elf32_map(as_init, << 288 if (0 == start_uaddr) << 289 { << 290 sos_process_unref(proc_init); << 291 return -SOS_ENOENT; << 292 } << 293 << 294 /* Allocate the user stack */ << 295 ustack = (SOS_PAGING_TOP_USER_ADDRESS - SOS_ << 296 retval = sos_dev_zero_map(as_init, &ustack, << 297 SOS_VM_MAP_PROT_RE << 298 /* PRIVATE */ 0); << 299 if (SOS_OK != retval) << 300 { << 301 sos_bochs_printf("ici 2\n"); << 302 sos_process_unref(proc_init); << 303 return -SOS_ENOMEM; << 304 } << 305 << 306 /* Now create the user thread */ << 307 new_thr = sos_create_user_thread(NULL, << 308 proc_init, << 309 start_uaddr << 310 0, 0, << 311 ustack + SO << 312 SOS_SCHED_P << 313 if (! new_thr) << 314 { << 315 sos_bochs_printf("ici 3\n"); << 316 sos_process_unref(proc_init); << 317 return -SOS_ENOMEM; << 318 } << 319 << 320 sos_process_unref(proc_init); << 321 return SOS_OK; << 322 } << 323 << 324 << 325 /* =========================================== << 326 * The C entry point of our operating system 327 * The C entry point of our operating system 327 */ 328 */ 328 void sos_main(unsigned long magic, unsigned lo 329 void sos_main(unsigned long magic, unsigned long addr) 329 { 330 { 330 unsigned i; 331 unsigned i; 331 sos_paddr_t sos_kernel_core_base_paddr, sos_ 332 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 332 struct sos_time tick_resolution; 333 struct sos_time tick_resolution; 333 334 334 /* Grub sends us a structure, called multibo 335 /* Grub sends us a structure, called multiboot_info_t with a lot of 335 precious informations about the system, s 336 precious informations about the system, see the multiboot 336 documentation for more information. */ 337 documentation for more information. */ 337 multiboot_info_t *mbi; 338 multiboot_info_t *mbi; 338 mbi = (multiboot_info_t *) addr; 339 mbi = (multiboot_info_t *) addr; 339 340 340 /* Setup bochs and console, and clear the co 341 /* Setup bochs and console, and clear the console */ 341 sos_bochs_setup(); 342 sos_bochs_setup(); 342 343 343 sos_x86_videomem_setup(); 344 sos_x86_videomem_setup(); 344 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 345 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 345 346 346 /* Greetings from SOS */ 347 /* Greetings from SOS */ 347 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 348 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 348 /* Loaded with Grub */ 349 /* Loaded with Grub */ 349 sos_x86_videomem_printf(1, 0, 350 sos_x86_videomem_printf(1, 0, 350 SOS_X86_VIDEO_FG_Y 351 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 351 "Welcome From GRUB 352 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 352 "SOS article 7.5", !! 353 "SOS article 7", ',', 353 (unsigned)(mbi->me 354 (unsigned)(mbi->mem_upper >> 10) + 1, 354 (unsigned)mbi->mem 355 (unsigned)mbi->mem_upper); 355 else 356 else 356 /* Not loaded with grub */ 357 /* Not loaded with grub */ 357 sos_x86_videomem_printf(1, 0, 358 sos_x86_videomem_printf(1, 0, 358 SOS_X86_VIDEO_FG_Y 359 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 359 "Welcome to SOS ar !! 360 "Welcome to SOS article 7"); 360 361 361 sos_bochs_putstring("Message in a bochs: Thi !! 362 sos_bochs_putstring("Message in a bochs: This is SOS article 7.\n"); 362 363 363 /* Setup CPU segmentation and IRQ subsystem 364 /* Setup CPU segmentation and IRQ subsystem */ 364 sos_gdt_subsystem_setup(); 365 sos_gdt_subsystem_setup(); 365 sos_idt_subsystem_setup(); 366 sos_idt_subsystem_setup(); 366 367 367 /* Setup SOS IRQs and exceptions subsystem * 368 /* Setup SOS IRQs and exceptions subsystem */ 368 sos_exception_subsystem_setup(); 369 sos_exception_subsystem_setup(); 369 sos_irq_subsystem_setup(); 370 sos_irq_subsystem_setup(); 370 371 371 /* Configure the timer so as to raise the IR 372 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 372 sos_i8254_set_frequency(100); 373 sos_i8254_set_frequency(100); 373 374 374 /* Setup the kernel time subsystem to get pr 375 /* Setup the kernel time subsystem to get prepared to take the timer 375 ticks into account */ 376 ticks into account */ 376 tick_resolution = (struct sos_time) { .sec=0 377 tick_resolution = (struct sos_time) { .sec=0, .nanosec=10000000UL }; 377 sos_time_subsysem_setup(& tick_resolution); 378 sos_time_subsysem_setup(& tick_resolution); 378 379 379 /* We need a multiboot-compliant boot loader 380 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 380 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 381 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 381 { 382 { 382 sos_x86_videomem_putstring(20, 0, 383 sos_x86_videomem_putstring(20, 0, 383 SOS_X86_VIDEO 384 SOS_X86_VIDEO_FG_LTRED 384 | SOS_X86_V 385 | SOS_X86_VIDEO_BG_BLUE 385 | SOS_X86_V 386 | SOS_X86_VIDEO_FG_BLINKING, 386 "I'm not load 387 "I'm not loaded with Grub !"); 387 /* STOP ! */ 388 /* STOP ! */ 388 for (;;) 389 for (;;) 389 continue; 390 continue; 390 } 391 } 391 392 392 /* 393 /* 393 * Some interrupt handlers 394 * Some interrupt handlers 394 */ 395 */ 395 396 396 /* Binding some HW interrupts and exceptions 397 /* Binding some HW interrupts and exceptions to software routines */ 397 sos_irq_set_routine(SOS_IRQ_TIMER, 398 sos_irq_set_routine(SOS_IRQ_TIMER, 398 clk_it); 399 clk_it); 399 400 400 /* 401 /* 401 * Setup physical memory management 402 * Setup physical memory management 402 */ 403 */ 403 404 404 /* Multiboot says: "The value returned for u 405 /* Multiboot says: "The value returned for upper memory is maximally 405 the address of the first upper memory hol 406 the address of the first upper memory hole minus 1 megabyte.". It 406 also adds: "It is not guaranteed to be th 407 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 407 sos_physmem_subsystem_setup((mbi->mem_upper< 408 sos_physmem_subsystem_setup((mbi->mem_upper<<10) + (1<<20), 408 & sos_kernel_cor 409 & sos_kernel_core_base_paddr, 409 & sos_kernel_cor 410 & sos_kernel_core_top_paddr); 410 411 411 /* 412 /* 412 * Switch to paged-memory mode 413 * Switch to paged-memory mode 413 */ 414 */ 414 415 415 /* Disabling interrupts should seem more cor 416 /* Disabling interrupts should seem more correct, but it's not really 416 necessary at this stage */ 417 necessary at this stage */ 417 SOS_ASSERT_FATAL(SOS_OK == 418 SOS_ASSERT_FATAL(SOS_OK == 418 sos_paging_subsystem_setup( 419 sos_paging_subsystem_setup(sos_kernel_core_base_paddr, 419 420 sos_kernel_core_top_paddr)); 420 421 421 /* Bind the page fault exception */ 422 /* Bind the page fault exception */ 422 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA 423 sos_exception_set_routine(SOS_EXCEPT_PAGE_FAULT, 423 pgflt_ex); 424 pgflt_ex); 424 425 425 /* 426 /* 426 * Setup kernel virtual memory allocator 427 * Setup kernel virtual memory allocator 427 */ 428 */ 428 429 429 if (sos_kmem_vmm_subsystem_setup(sos_kernel_ 430 if (sos_kmem_vmm_subsystem_setup(sos_kernel_core_base_paddr, 430 sos_kernel_ 431 sos_kernel_core_top_paddr, 431 bootstrap_s 432 bootstrap_stack_bottom, 432 bootstrap_s 433 bootstrap_stack_bottom 433 + bootstrap 434 + bootstrap_stack_size)) 434 sos_bochs_printf("Could not setup the Kern 435 sos_bochs_printf("Could not setup the Kernel virtual space allocator\n"); 435 436 436 if (sos_kmalloc_subsystem_setup()) 437 if (sos_kmalloc_subsystem_setup()) 437 sos_bochs_printf("Could not setup the Kmal 438 sos_bochs_printf("Could not setup the Kmalloc subsystem\n"); 438 439 439 /* 440 /* 440 * Initialize the MMU context subsystem 441 * Initialize the MMU context subsystem 441 */ 442 */ 442 sos_mm_context_subsystem_setup(); 443 sos_mm_context_subsystem_setup(); 443 444 444 /* 445 /* 445 * Initialize the CPU context subsystem 446 * Initialize the CPU context subsystem 446 */ 447 */ 447 sos_cpu_context_subsystem_setup(); 448 sos_cpu_context_subsystem_setup(); 448 449 449 /* 450 /* 450 * Bind the syscall handler to its software 451 * Bind the syscall handler to its software interrupt handler 451 */ 452 */ 452 sos_swintr_subsystem_setup(); 453 sos_swintr_subsystem_setup(); 453 454 454 455 455 /* 456 /* 456 * Initialize the Kernel thread and schedule 457 * Initialize the Kernel thread and scheduler subsystems 457 */ 458 */ 458 459 459 /* Initialize kernel thread subsystem */ 460 /* Initialize kernel thread subsystem */ 460 sos_thread_subsystem_setup(bootstrap_stack_b 461 sos_thread_subsystem_setup(bootstrap_stack_bottom, 461 bootstrap_stack_s 462 bootstrap_stack_size); 462 463 463 /* Initialize the scheduler */ 464 /* Initialize the scheduler */ 464 sos_sched_subsystem_setup(); 465 sos_sched_subsystem_setup(); 465 466 466 /* Declare the IDLE thread */ 467 /* Declare the IDLE thread */ 467 SOS_ASSERT_FATAL(sos_create_kernel_thread("i 468 SOS_ASSERT_FATAL(sos_create_kernel_thread("idle", idle_thread, NULL, 468 SO 469 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 469 470 470 /* Prepare the stats subsystem */ 471 /* Prepare the stats subsystem */ 471 sos_load_subsystem_setup(); 472 sos_load_subsystem_setup(); 472 473 473 /* Declare a thread that prints some stats * 474 /* Declare a thread that prints some stats */ 474 SOS_ASSERT_FATAL(sos_create_kernel_thread("s 475 SOS_ASSERT_FATAL(sos_create_kernel_thread("stat_thread", stat_thread, 475 NU 476 NULL, 476 SO 477 SOS_SCHED_PRIO_TS_LOWEST) != NULL); 477 478 478 479 479 /* 480 /* 480 * Initialise user address space management << 481 */ << 482 sos_umem_vmm_subsystem_setup(); << 483 sos_dev_zero_subsystem_setup(); << 484 << 485 /* << 486 * Initialize process stuff 481 * Initialize process stuff 487 */ 482 */ 488 sos_process_subsystem_setup(); 483 sos_process_subsystem_setup(); 489 484 490 485 491 /* Enabling the HW interrupts here, this wil 486 /* Enabling the HW interrupts here, this will make the timer HW 492 interrupt call the scheduler */ 487 interrupt call the scheduler */ 493 asm volatile ("sti\n"); 488 asm volatile ("sti\n"); 494 489 495 /* Start the 'init' process, which in turns !! 490 /* Run some tests involving USER processes and threads */ 496 programs */ !! 491 extern void test_art7(); 497 start_init(); !! 492 test_art7(); >> 493 >> 494 /* Now run some Kernel threads just for fun ! */ >> 495 extern void MouseSim(); >> 496 MouseSim(); >> 497 test_thread(); 498 498 499 /* 499 /* 500 * We can safely exit from this function now 500 * We can safely exit from this function now, for there is already 501 * an idle Kernel thread ready to make the C 501 * an idle Kernel thread ready to make the CPU busy working... 502 * 502 * 503 * However, we must EXPLICITELY call sos_thr 503 * However, we must EXPLICITELY call sos_thread_exit() because a 504 * simple "return" will return nowhere ! Act 504 * simple "return" will return nowhere ! Actually this first thread 505 * was initialized by the Grub bootstrap sta 505 * was initialized by the Grub bootstrap stage, at a time when the 506 * word "thread" did not exist. This means t 506 * word "thread" did not exist. This means that the stack was not 507 * setup in order for a return here to call 507 * setup in order for a return here to call sos_thread_exit() 508 * automagically. Hence we must call it manu 508 * automagically. Hence we must call it manually. This is the ONLY 509 * kernel thread where we must do this manua 509 * kernel thread where we must do this manually. 510 */ 510 */ 511 sos_bochs_printf("Bye from primary thread !\ 511 sos_bochs_printf("Bye from primary thread !\n"); 512 sos_thread_exit(); 512 sos_thread_exit(); 513 SOS_FATAL_ERROR("No trespassing !"); 513 SOS_FATAL_ERROR("No trespassing !"); 514 } 514 }
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