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001 /* Copyright (C) 2004 The SOS Team 001 /* Copyright (C) 2004 The SOS Team 002 Copyright (C) 1999 Free Software Foundatio 002 Copyright (C) 1999 Free Software Foundation, Inc. 003 003 004 This program is free software; you can redi 004 This program is free software; you can redistribute it and/or 005 modify it under the terms of the GNU Genera 005 modify it under the terms of the GNU General Public License 006 as published by the Free Software Foundatio 006 as published by the Free Software Foundation; either version 2 007 of the License, or (at your option) any lat 007 of the License, or (at your option) any later version. 008 008 009 This program is distributed in the hope tha 009 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the 010 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU General Public License for more details 012 GNU General Public License for more details. 013 013 014 You should have received a copy of the GNU 014 You should have received a copy of the GNU General Public License 015 along with this program; if not, write to t 015 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place - Suite 3 016 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 017 USA. 017 USA. 018 */ 018 */ 019 019 020 /* Include definitions of the multiboot standa 020 /* Include definitions of the multiboot standard */ 021 #include <bootstrap/multiboot.h> 021 #include <bootstrap/multiboot.h> 022 #include <hwcore/idt.h> 022 #include <hwcore/idt.h> 023 #include <hwcore/gdt.h> 023 #include <hwcore/gdt.h> 024 #include <hwcore/irq.h> 024 #include <hwcore/irq.h> 025 #include <hwcore/exception.h> 025 #include <hwcore/exception.h> 026 #include <hwcore/i8254.h> 026 #include <hwcore/i8254.h> 027 #include <sos/list.h> 027 #include <sos/list.h> 028 #include <sos/physmem.h> 028 #include <sos/physmem.h> 029 #include <hwcore/paging.h> << 030 #include <sos/list.h> << 031 #include <sos/klibc.h> 029 #include <sos/klibc.h> 032 #include <sos/assert.h> 030 #include <sos/assert.h> 033 #include <drivers/x86_videomem.h> 031 #include <drivers/x86_videomem.h> 034 #include <drivers/bochs.h> 032 #include <drivers/bochs.h> 035 033 036 034 037 /* Helper function to display each bits of a 3 035 /* Helper function to display each bits of a 32bits integer on the 038 screen as dark or light carrets */ 036 screen as dark or light carrets */ 039 static void display_bits(unsigned char row, un 037 static void display_bits(unsigned char row, unsigned char col, 040 unsigned char attribu 038 unsigned char attribute, 041 sos_ui32_t integer) 039 sos_ui32_t integer) 042 { 040 { 043 int i; 041 int i; 044 /* Scan each bit of the integer, MSb first * 042 /* Scan each bit of the integer, MSb first */ 045 for (i = 31 ; i >= 0 ; i--) 043 for (i = 31 ; i >= 0 ; i--) 046 { 044 { 047 /* Test if bit i of 'integer' is set */ 045 /* Test if bit i of 'integer' is set */ 048 int bit_i = (integer & (1 << i)); 046 int bit_i = (integer & (1 << i)); 049 /* Ascii 219 => dark carret, Ascii 177 = 047 /* Ascii 219 => dark carret, Ascii 177 => light carret */ 050 unsigned char ascii_code = bit_i?219:177 048 unsigned char ascii_code = bit_i?219:177; 051 sos_x86_videomem_putchar(row, col++, 049 sos_x86_videomem_putchar(row, col++, 052 attribute, 050 attribute, 053 ascii_code); 051 ascii_code); 054 } 052 } 055 } 053 } 056 054 057 055 058 /* Clock IRQ handler */ 056 /* Clock IRQ handler */ 059 static void clk_it(int intid) 057 static void clk_it(int intid) 060 { 058 { 061 static sos_ui32_t clock_count = 0; 059 static sos_ui32_t clock_count = 0; 062 060 063 display_bits(0, 48, 061 display_bits(0, 48, 064 SOS_X86_VIDEO_FG_LTGREEN | SOS_ 062 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, 065 clock_count); 063 clock_count); 066 clock_count++; 064 clock_count++; 067 065 068 } 066 } 069 067 070 /* Page fault exception handler */ !! 068 #define MY_PPAGE_NUM_INT 511 071 static void pgflt_ex(int exid) !! 069 struct my_ppage 072 { 070 { 073 sos_bochs_printf("Got page fault\n"); !! 071 sos_ui32_t before[MY_PPAGE_NUM_INT]; 074 sos_x86_videomem_printf(10, 30, !! 072 struct my_ppage *prev, *next; 075 SOS_X86_VIDEO_FG_LTR !! 073 sos_ui32_t after[MY_PPAGE_NUM_INT]; 076 "Got EXPECTED (?) Pa !! 074 }; /* sizeof() Must be <= 4kB */ 077 for (;;) ; << 078 } << 079 075 080 static void test_paging(sos_vaddr_t sos_kernel !! 076 static void test_physmem() 081 { 077 { 082 /* The (linear) address of the page holding !! 078 /* We place the pages we did allocate here */ 083 currently executing */ !! 079 struct my_ppage *ppage_list, *my_ppage; 084 sos_vaddr_t vpage_code = SOS_PAGE_ALIGN_INF( !! 080 sos_count_t num_alloc_ppages = 0, num_free_ppages = 0; 085 !! 081 086 /* The new physical page that will hold the !! 082 ppage_list = NULL; 087 sos_paddr_t ppage_new; !! 083 while ((my_ppage = (struct my_ppage*)sos_physmem_ref_physpage_new(FALSE)) 088 !! 084 != NULL) 089 /* Where this page will be mapped temporaril << 090 code into it: right after the kernel code << 091 sos_vaddr_t vpage_tmp = sos_kernel_core_top_ << 092 << 093 unsigned i; << 094 << 095 /* Bind the page fault exception to one of o << 096 sos_exception_set_routine(SOS_EXCEPT_PAGE_FA << 097 pgflt_ex); << 098 << 099 /* << 100 * Test 1: move the page where we execute th << 101 * physical memory << 102 */ << 103 sos_x86_videomem_printf(4, 0, << 104 SOS_X86_VIDEO_FG_LTG << 105 "Moving current code << 106 << 107 << 108 /* Allocate a new physical page */ << 109 ppage_new = sos_physmem_ref_physpage_new(FAL << 110 if (! ppage_new) << 111 { 085 { 112 /* STOP ! No memory left */ !! 086 int i; 113 sos_x86_videomem_putstring(20, 0, !! 087 num_alloc_ppages++; 114 SOS_X86_VIDEO !! 088 115 | SOS_X86_V !! 089 /* Print the allocation status */ 116 "test_paging !! 090 sos_x86_videomem_printf(2, 0, 117 return; !! 091 SOS_X86_VIDEO_FG_YELLOW >> 092 | SOS_X86_VIDEO_BG_BLUE, >> 093 "Could allocate %d pages ", >> 094 num_alloc_ppages); >> 095 >> 096 /* We fill this page with its address */ >> 097 for (i = 0 ; i < MY_PPAGE_NUM_INT ; i++) >> 098 my_ppage->before[i] = my_ppage->after[i] = (sos_ui32_t)my_ppage; >> 099 >> 100 /* We add this page at the tail of our list of ppages */ >> 101 list_add_tail(ppage_list, my_ppage); 118 } 102 } 119 103 120 sos_x86_videomem_printf(5, 0, !! 104 /* Now we release these pages in FIFO order */ 121 SOS_X86_VIDEO_FG_YEL !! 105 while ((my_ppage = list_pop_head(ppage_list)) != NULL) 122 "Hello from the addr << 123 sos_paging_get_paddr << 124 << 125 sos_x86_videomem_printf(6, 0, << 126 SOS_X86_VIDEO_FG_YEL << 127 "Transfer vpage 0x%x << 128 vpage_code, << 129 sos_paging_get_paddr << 130 ppage_new, << 131 (unsigned)vpage_tmp) << 132 << 133 /* Map the page somewhere (right after the k << 134 to copy the code we are currently executi << 135 sos_paging_map(ppage_new, vpage_tmp, << 136 FALSE, << 137 SOS_VM_MAP_ATOMIC << 138 | SOS_VM_MAP_PROT_READ << 139 | SOS_VM_MAP_PROT_WRITE); << 140 << 141 /* Ok, the new page is referenced by the map << 142 reference to it */ << 143 sos_physmem_unref_physpage(ppage_new); << 144 << 145 /* Copy the contents of the current page of << 146 mapping */ << 147 memcpy((void*)vpage_tmp, << 148 (void*)vpage_code, << 149 SOS_PAGE_SIZE); << 150 << 151 /* Transfer the mapping of the current page << 152 sos_paging_map(ppage_new, vpage_code, << 153 FALSE, << 154 SOS_VM_MAP_ATOMIC << 155 | SOS_VM_MAP_PROT_READ << 156 | SOS_VM_MAP_PROT_WRITE); << 157 << 158 /* Ok, here we are: we have changed the phys << 159 code we are executing ;). However, this n << 160 virtual addresses: << 161 - vpage_tmp << 162 - vpage_code << 163 We can safely unmap it from sos_kernel_co << 164 still keeping the vpage_code mapping */ << 165 sos_paging_unmap(vpage_tmp); << 166 << 167 sos_x86_videomem_printf(7, 0, << 168 SOS_X86_VIDEO_FG_YEL << 169 "Hello from the addr << 170 sos_paging_get_paddr << 171 << 172 sos_x86_videomem_printf(9, 0, << 173 SOS_X86_VIDEO_FG_LTG << 174 "Provoking a page fa << 175 << 176 /* << 177 * Test 2: make sure the #PF handler works << 178 */ << 179 << 180 /* Scan part of the kernel up to a page faul << 181 should occur on the first page unmapped a << 182 which is exactly the page we temporarily << 183 (vpage_tmp) above to move the kernel code << 184 for (i = vpage_code ; /* none */ ; i += SOS_ << 185 { 106 { 186 unsigned *pint = (unsigned *)SOS_PAGE_AL !! 107 /* We make sure this page was not overwritten by any unexpected 187 sos_bochs_printf("Test vaddr 0x%x : val= !! 108 value */ 188 sos_x86_videomem_printf(10, 0, !! 109 int i; 189 SOS_X86_VIDEO_FG !! 110 for (i = 0 ; i < MY_PPAGE_NUM_INT ; i++) 190 "Test vaddr 0x%x !! 111 { 191 (unsigned)pint); !! 112 /* We don't get what we expect ! */ 192 sos_bochs_printf("0x%x\n", *pint); !! 113 if ((my_ppage->before[i] != (sos_ui32_t)my_ppage) 193 sos_x86_videomem_printf(10, 30, !! 114 || (my_ppage->after[i] != (sos_ui32_t)my_ppage)) 194 SOS_X86_VIDEO_FG !! 115 { 195 "0x%x " !! 116 /* STOP ! */ >> 117 sos_x86_videomem_putstring(20, 0, >> 118 SOS_X86_VIDEO_FG_LTRED >> 119 | SOS_X86_VIDEO_BG_BLUE, >> 120 "Page overwritten"); >> 121 return; >> 122 } >> 123 } >> 124 >> 125 /* Release the descriptor */ >> 126 if (sos_physmem_unref_physpage((sos_paddr_t)my_ppage) < 0) >> 127 { >> 128 /* STOP ! */ >> 129 sos_x86_videomem_putstring(20, 0, >> 130 SOS_X86_VIDEO_FG_LTRED >> 131 | SOS_X86_VIDEO_BG_BLUE, >> 132 "Cannot release page"); >> 133 return; >> 134 } >> 135 >> 136 /* Print the deallocation status */ >> 137 num_free_ppages ++; >> 138 sos_x86_videomem_printf(2, 0, >> 139 SOS_X86_VIDEO_FG_YELLOW >> 140 | SOS_X86_VIDEO_BG_BLUE, >> 141 "Could free %d pages ", >> 142 num_free_ppages); 196 } 143 } 197 144 198 /* BAD ! Did not get the page fault... */ !! 145 /* Print the overall stats */ 199 sos_x86_videomem_printf(20, 0, !! 146 sos_x86_videomem_printf(2, 0, 200 SOS_X86_VIDEO_FG_LTR !! 147 SOS_X86_VIDEO_FG_LTGREEN 201 "We should have had !! 148 | SOS_X86_VIDEO_BG_BLUE, 202 vpage_tmp); !! 149 "Could allocate %d bytes, could free %d bytes ", >> 150 num_alloc_ppages << SOS_PAGE_SHIFT, >> 151 num_free_ppages << SOS_PAGE_SHIFT); >> 152 >> 153 SOS_ASSERT_FATAL(num_alloc_ppages == num_free_ppages); 203 } 154 } 204 155 >> 156 205 /* The C entry point of our operating system * 157 /* The C entry point of our operating system */ 206 void sos_main(unsigned long magic, unsigned lo 158 void sos_main(unsigned long magic, unsigned long addr) 207 { 159 { 208 unsigned i; 160 unsigned i; 209 sos_paddr_t sos_kernel_core_base_paddr, sos_ 161 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 210 162 211 /* Grub sends us a structure, called multibo 163 /* Grub sends us a structure, called multiboot_info_t with a lot of 212 precious informations about the system, s 164 precious informations about the system, see the multiboot 213 documentation for more information. */ 165 documentation for more information. */ 214 multiboot_info_t *mbi; 166 multiboot_info_t *mbi; 215 mbi = (multiboot_info_t *) addr; 167 mbi = (multiboot_info_t *) addr; 216 168 217 /* Setup bochs and console, and clear the co 169 /* Setup bochs and console, and clear the console */ 218 sos_bochs_setup(); 170 sos_bochs_setup(); 219 171 220 sos_x86_videomem_setup(); 172 sos_x86_videomem_setup(); 221 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 173 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 222 174 223 /* Greetings from SOS */ 175 /* Greetings from SOS */ 224 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 176 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 225 /* Loaded with Grub */ 177 /* Loaded with Grub */ 226 sos_x86_videomem_printf(1, 0, 178 sos_x86_videomem_printf(1, 0, 227 SOS_X86_VIDEO_FG_Y 179 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 228 "Welcome From GRUB 180 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 229 "SOS", ',', 181 "SOS", ',', 230 (unsigned)(mbi->me 182 (unsigned)(mbi->mem_upper >> 10) + 1, 231 (unsigned)mbi->mem 183 (unsigned)mbi->mem_upper); 232 else 184 else 233 /* Not loaded with grub */ 185 /* Not loaded with grub */ 234 sos_x86_videomem_printf(1, 0, 186 sos_x86_videomem_printf(1, 0, 235 SOS_X86_VIDEO_FG_Y 187 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 236 "Welcome to SOS"); 188 "Welcome to SOS"); 237 189 238 sos_bochs_putstring("Message in a bochs\n"); 190 sos_bochs_putstring("Message in a bochs\n"); 239 191 240 /* Setup CPU segmentation and IRQ subsystem 192 /* Setup CPU segmentation and IRQ subsystem */ 241 sos_gdt_setup(); 193 sos_gdt_setup(); 242 sos_idt_setup(); 194 sos_idt_setup(); 243 195 244 /* Setup SOS IRQs and exceptions subsystem * 196 /* Setup SOS IRQs and exceptions subsystem */ 245 sos_exceptions_setup(); 197 sos_exceptions_setup(); 246 sos_irq_setup(); 198 sos_irq_setup(); 247 199 248 /* Configure the timer so as to raise the IR 200 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ 249 sos_i8254_set_frequency(100); 201 sos_i8254_set_frequency(100); 250 202 251 203 252 /* We need a multiboot-compliant boot loader 204 /* We need a multiboot-compliant boot loader to get the size of the RAM */ 253 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 205 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) 254 { 206 { 255 sos_x86_videomem_putstring(20, 0, 207 sos_x86_videomem_putstring(20, 0, 256 SOS_X86_VIDEO 208 SOS_X86_VIDEO_FG_LTRED 257 | SOS_X86_V 209 | SOS_X86_VIDEO_BG_BLUE 258 | SOS_X86_V 210 | SOS_X86_VIDEO_FG_BLINKING, 259 "I'm not load 211 "I'm not loaded with Grub !"); 260 /* STOP ! */ 212 /* STOP ! */ 261 for (;;) 213 for (;;) 262 continue; 214 continue; 263 } 215 } 264 216 265 /* Binding some HW interrupts and exceptions 217 /* Binding some HW interrupts and exceptions to software routines */ 266 sos_irq_set_routine(SOS_IRQ_TIMER, 218 sos_irq_set_routine(SOS_IRQ_TIMER, 267 clk_it); 219 clk_it); 268 /* Enabling the HW interrupts here, this wil 220 /* Enabling the HW interrupts here, this will make the timer HW 269 interrupt call our clk_it handler */ 221 interrupt call our clk_it handler */ 270 asm volatile ("sti\n"); 222 asm volatile ("sti\n"); 271 /* Multiboot says: "The value returned for u 223 /* Multiboot says: "The value returned for upper memory is maximally 272 the address of the first upper memory hol 224 the address of the first upper memory hole minus 1 megabyte.". It 273 also adds: "It is not guaranteed to be th 225 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ 274 sos_physmem_setup((mbi->mem_upper<<10) + (1< 226 sos_physmem_setup((mbi->mem_upper<<10) + (1<<20), 275 & sos_kernel_core_base_pad 227 & sos_kernel_core_base_paddr, 276 & sos_kernel_core_top_padd 228 & sos_kernel_core_top_paddr); 277 !! 229 test_physmem(); 278 /* << 279 * Switch to paged-memory mode << 280 */ << 281 << 282 /* Disabling interrupts should seem more cor << 283 necessary at this stage */ << 284 if (sos_paging_setup(sos_kernel_core_base_pa << 285 sos_kernel_core_top_pad << 286 sos_bochs_printf("Could not setup paged me << 287 sos_x86_videomem_printf(2, 0, << 288 SOS_X86_VIDEO_FG_YEL << 289 "Paged-memory mode i << 290 << 291 test_paging(sos_kernel_core_top_paddr); << 292 230 293 /* An operatig system never ends */ 231 /* An operatig system never ends */ 294 for (;;) 232 for (;;) 295 continue; 233 continue; 296 234 297 return; 235 return; 298 } 236 }
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