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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> << 023 #include <hwcore/gdt.h> << 024 #include <hwcore/irq.h> << 025 #include <hwcore/exception.h> << 026 #include <hwcore/i8254.h> << 027 #include <sos/list.h> << 028 #include <sos/physmem.h> << 029 #include <hwcore/paging.h> << 030 #include <sos/list.h> << 031 #include <sos/klibc.h> 022 #include <sos/klibc.h> 032 #include <sos/assert.h> 023 #include <sos/assert.h> 033 #include <drivers/x86_videomem.h> 024 #include <drivers/x86_videomem.h> 034 #include <drivers/bochs.h> 025 #include <drivers/bochs.h> 035 026 036 027 037 /* Helper function to display each bits of a 3 << 038 screen as dark or light carrets */ << 039 static void display_bits(unsigned char row, un << 040 unsigned char attribu << 041 sos_ui32_t integer) << 042 { << 043 int i; << 044 /* Scan each bit of the integer, MSb first * << 045 for (i = 31 ; i >= 0 ; i--) << 046 { << 047 /* Test if bit i of 'integer' is set */ << 048 int bit_i = (integer & (1 << i)); << 049 /* Ascii 219 => dark carret, Ascii 177 = << 050 unsigned char ascii_code = bit_i?219:177 << 051 sos_x86_videomem_putchar(row, col++, << 052 attribute, << 053 ascii_code); << 054 } << 055 } << 056 << 057 << 058 /* Clock IRQ handler */ << 059 static void clk_it(int intid) << 060 { << 061 static sos_ui32_t clock_count = 0; << 062 << 063 display_bits(0, 48, << 064 SOS_X86_VIDEO_FG_LTGREEN | SOS_ << 065 clock_count); << 066 clock_count++; << 067 << 068 } << 069 << 070 /* Page fault exception handler */ << 071 static void pgflt_ex(int exid) << 072 { << 073 sos_bochs_printf("Got page fault\n"); << 074 sos_x86_videomem_printf(10, 30, << 075 SOS_X86_VIDEO_FG_LTR << 076 "Got EXPECTED (?) Pa << 077 for (;;) ; << 078 } << 079 << 080 static void test_paging(sos_vaddr_t sos_kernel << 081 { << 082 /* The (linear) address of the page holding << 083 currently executing */ << 084 sos_vaddr_t vpage_code = SOS_PAGE_ALIGN_INF( << 085 << 086 /* The new physical page that will hold the << 087 sos_paddr_t ppage_new; << 088 << 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 { << 112 /* STOP ! No memory left */ << 113 sos_x86_videomem_putstring(20, 0, << 114 SOS_X86_VIDEO << 115 | SOS_X86_V << 116 "test_paging << 117 return; << 118 } << 119 << 120 sos_x86_videomem_printf(5, 0, << 121 SOS_X86_VIDEO_FG_YEL << 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 { << 186 unsigned *pint = (unsigned *)SOS_PAGE_AL << 187 sos_bochs_printf("Test vaddr 0x%x : val= << 188 sos_x86_videomem_printf(10, 0, << 189 SOS_X86_VIDEO_FG << 190 "Test vaddr 0x%x << 191 (unsigned)pint); << 192 sos_bochs_printf("0x%x\n", *pint); << 193 sos_x86_videomem_printf(10, 30, << 194 SOS_X86_VIDEO_FG << 195 "0x%x " << 196 } << 197 << 198 /* BAD ! Did not get the page fault... */ << 199 sos_x86_videomem_printf(20, 0, << 200 SOS_X86_VIDEO_FG_LTR << 201 "We should have had << 202 vpage_tmp); << 203 } << 204 028 205 /* The C entry point of our operating system * 029 /* The C entry point of our operating system */ 206 void sos_main(unsigned long magic, unsigned lo 030 void sos_main(unsigned long magic, unsigned long addr) 207 { 031 { 208 unsigned i; 032 unsigned i; 209 sos_paddr_t sos_kernel_core_base_paddr, sos_ << 210 033 211 /* Grub sends us a structure, called multibo 034 /* Grub sends us a structure, called multiboot_info_t with a lot of 212 precious informations about the system, s 035 precious informations about the system, see the multiboot 213 documentation for more information. */ 036 documentation for more information. */ 214 multiboot_info_t *mbi; 037 multiboot_info_t *mbi; 215 mbi = (multiboot_info_t *) addr; 038 mbi = (multiboot_info_t *) addr; 216 039 217 /* Setup bochs and console, and clear the co 040 /* Setup bochs and console, and clear the console */ 218 sos_bochs_setup(); 041 sos_bochs_setup(); 219 042 220 sos_x86_videomem_setup(); 043 sos_x86_videomem_setup(); 221 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 044 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 222 045 223 /* Greetings from SOS */ 046 /* Greetings from SOS */ 224 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 047 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 225 /* Loaded with Grub */ 048 /* Loaded with Grub */ 226 sos_x86_videomem_printf(1, 0, 049 sos_x86_videomem_printf(1, 0, 227 SOS_X86_VIDEO_FG_Y 050 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 228 "Welcome From GRUB 051 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 229 "SOS", ',', 052 "SOS", ',', 230 (unsigned)(mbi->me 053 (unsigned)(mbi->mem_upper >> 10) + 1, 231 (unsigned)mbi->mem 054 (unsigned)mbi->mem_upper); 232 else 055 else 233 /* Not loaded with grub */ 056 /* Not loaded with grub */ 234 sos_x86_videomem_printf(1, 0, 057 sos_x86_videomem_printf(1, 0, 235 SOS_X86_VIDEO_FG_Y 058 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 236 "Welcome to SOS"); 059 "Welcome to SOS"); 237 060 238 sos_bochs_putstring("Message in a bochs\n"); 061 sos_bochs_putstring("Message in a bochs\n"); 239 062 240 /* Setup CPU segmentation and IRQ subsystem << 241 sos_gdt_setup(); << 242 sos_idt_setup(); << 243 << 244 /* Setup SOS IRQs and exceptions subsystem * << 245 sos_exceptions_setup(); << 246 sos_irq_setup(); << 247 << 248 /* Configure the timer so as to raise the IR << 249 sos_i8254_set_frequency(100); << 250 << 251 << 252 /* We need a multiboot-compliant boot loader << 253 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) << 254 { << 255 sos_x86_videomem_putstring(20, 0, << 256 SOS_X86_VIDEO << 257 | SOS_X86_V << 258 | SOS_X86_V << 259 "I'm not load << 260 /* STOP ! */ << 261 for (;;) << 262 continue; << 263 } << 264 << 265 /* Binding some HW interrupts and exceptions << 266 sos_irq_set_routine(SOS_IRQ_TIMER, << 267 clk_it); << 268 /* Enabling the HW interrupts here, this wil << 269 interrupt call our clk_it handler */ << 270 asm volatile ("sti\n"); << 271 /* Multiboot says: "The value returned for u << 272 the address of the first upper memory hol << 273 also adds: "It is not guaranteed to be th << 274 sos_physmem_setup((mbi->mem_upper<<10) + (1< << 275 & sos_kernel_core_base_pad << 276 & sos_kernel_core_top_padd << 277 << 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); << 292 063 293 /* An operatig system never ends */ 064 /* An operatig system never ends */ 294 for (;;) 065 for (;;) 295 continue; 066 continue; 296 067 297 return; 068 return; 298 } 069 }
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