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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> 022 #include <sos/klibc.h> 029 #include <sos/klibc.h> 023 #include <sos/assert.h> 030 #include <sos/assert.h> 024 #include <drivers/x86_videomem.h> 031 #include <drivers/x86_videomem.h> 025 #include <drivers/bochs.h> 032 #include <drivers/bochs.h> 026 033 027 034 >> 035 /* Helper function to display each bits of a 32bits integer on the >> 036 screen as dark or light carrets */ >> 037 static void display_bits(unsigned char row, unsigned char col, >> 038 unsigned char attribute, >> 039 sos_ui32_t integer) >> 040 { >> 041 int i; >> 042 /* Scan each bit of the integer, MSb first */ >> 043 for (i = 31 ; i >= 0 ; i--) >> 044 { >> 045 /* Test if bit i of 'integer' is set */ >> 046 int bit_i = (integer & (1 << i)); >> 047 /* Ascii 219 => dark carret, Ascii 177 => light carret */ >> 048 unsigned char ascii_code = bit_i?219:177; >> 049 sos_x86_videomem_putchar(row, col++, >> 050 attribute, >> 051 ascii_code); >> 052 } >> 053 } >> 054 >> 055 >> 056 /* Clock IRQ handler */ >> 057 static void clk_it(int intid) >> 058 { >> 059 static sos_ui32_t clock_count = 0; >> 060 >> 061 display_bits(0, 48, >> 062 SOS_X86_VIDEO_FG_LTGREEN | SOS_X86_VIDEO_BG_BLUE, >> 063 clock_count); >> 064 clock_count++; >> 065 >> 066 } >> 067 >> 068 #define MY_PPAGE_NUM_INT 511 >> 069 struct my_ppage >> 070 { >> 071 sos_ui32_t before[MY_PPAGE_NUM_INT]; >> 072 struct my_ppage *prev, *next; >> 073 sos_ui32_t after[MY_PPAGE_NUM_INT]; >> 074 }; /* sizeof() Must be <= 4kB */ >> 075 >> 076 static void test_physmem() >> 077 { >> 078 /* We place the pages we did allocate here */ >> 079 struct my_ppage *ppage_list, *my_ppage; >> 080 sos_count_t num_alloc_ppages = 0, num_free_ppages = 0; >> 081 >> 082 ppage_list = NULL; >> 083 while ((my_ppage = (struct my_ppage*)sos_physmem_ref_physpage_new(FALSE)) >> 084 != NULL) >> 085 { >> 086 int i; >> 087 num_alloc_ppages++; >> 088 >> 089 /* Print the allocation status */ >> 090 sos_x86_videomem_printf(2, 0, >> 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); >> 102 } >> 103 >> 104 /* Now we release these pages in FIFO order */ >> 105 while ((my_ppage = list_pop_head(ppage_list)) != NULL) >> 106 { >> 107 /* We make sure this page was not overwritten by any unexpected >> 108 value */ >> 109 int i; >> 110 for (i = 0 ; i < MY_PPAGE_NUM_INT ; i++) >> 111 { >> 112 /* We don't get what we expect ! */ >> 113 if ((my_ppage->before[i] != (sos_ui32_t)my_ppage) >> 114 || (my_ppage->after[i] != (sos_ui32_t)my_ppage)) >> 115 { >> 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); >> 143 } >> 144 >> 145 /* Print the overall stats */ >> 146 sos_x86_videomem_printf(2, 0, >> 147 SOS_X86_VIDEO_FG_LTGREEN >> 148 | SOS_X86_VIDEO_BG_BLUE, >> 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); >> 154 } >> 155 028 156 029 /* The C entry point of our operating system * 157 /* The C entry point of our operating system */ 030 void sos_main(unsigned long magic, unsigned lo 158 void sos_main(unsigned long magic, unsigned long addr) 031 { 159 { 032 unsigned i; 160 unsigned i; >> 161 sos_paddr_t sos_kernel_core_base_paddr, sos_kernel_core_top_paddr; 033 162 034 /* Grub sends us a structure, called multibo 163 /* Grub sends us a structure, called multiboot_info_t with a lot of 035 precious informations about the system, s 164 precious informations about the system, see the multiboot 036 documentation for more information. */ 165 documentation for more information. */ 037 multiboot_info_t *mbi; 166 multiboot_info_t *mbi; 038 mbi = (multiboot_info_t *) addr; 167 mbi = (multiboot_info_t *) addr; 039 168 040 /* Setup bochs and console, and clear the co 169 /* Setup bochs and console, and clear the console */ 041 sos_bochs_setup(); 170 sos_bochs_setup(); 042 171 043 sos_x86_videomem_setup(); 172 sos_x86_videomem_setup(); 044 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 173 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 045 174 046 /* Greetings from SOS */ 175 /* Greetings from SOS */ 047 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 176 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 048 /* Loaded with Grub */ 177 /* Loaded with Grub */ 049 sos_x86_videomem_printf(1, 0, 178 sos_x86_videomem_printf(1, 0, 050 SOS_X86_VIDEO_FG_Y 179 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 051 "Welcome From GRUB 180 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 052 "SOS", ',', 181 "SOS", ',', 053 (unsigned)(mbi->me 182 (unsigned)(mbi->mem_upper >> 10) + 1, 054 (unsigned)mbi->mem 183 (unsigned)mbi->mem_upper); 055 else 184 else 056 /* Not loaded with grub */ 185 /* Not loaded with grub */ 057 sos_x86_videomem_printf(1, 0, 186 sos_x86_videomem_printf(1, 0, 058 SOS_X86_VIDEO_FG_Y 187 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 059 "Welcome to SOS"); 188 "Welcome to SOS"); 060 189 061 sos_bochs_putstring("Message in a bochs\n"); 190 sos_bochs_putstring("Message in a bochs\n"); 062 191 >> 192 /* Setup CPU segmentation and IRQ subsystem */ >> 193 sos_gdt_setup(); >> 194 sos_idt_setup(); >> 195 >> 196 /* Setup SOS IRQs and exceptions subsystem */ >> 197 sos_exceptions_setup(); >> 198 sos_irq_setup(); >> 199 >> 200 /* Configure the timer so as to raise the IRQ0 at a 100Hz rate */ >> 201 sos_i8254_set_frequency(100); >> 202 >> 203 >> 204 /* We need a multiboot-compliant boot loader to get the size of the RAM */ >> 205 if (magic != MULTIBOOT_BOOTLOADER_MAGIC) >> 206 { >> 207 sos_x86_videomem_putstring(20, 0, >> 208 SOS_X86_VIDEO_FG_LTRED >> 209 | SOS_X86_VIDEO_BG_BLUE >> 210 | SOS_X86_VIDEO_FG_BLINKING, >> 211 "I'm not loaded with Grub !"); >> 212 /* STOP ! */ >> 213 for (;;) >> 214 continue; >> 215 } >> 216 >> 217 /* Binding some HW interrupts and exceptions to software routines */ >> 218 sos_irq_set_routine(SOS_IRQ_TIMER, >> 219 clk_it); >> 220 /* Enabling the HW interrupts here, this will make the timer HW >> 221 interrupt call our clk_it handler */ >> 222 asm volatile ("sti\n"); >> 223 /* Multiboot says: "The value returned for upper memory is maximally >> 224 the address of the first upper memory hole minus 1 megabyte.". It >> 225 also adds: "It is not guaranteed to be this value." aka "YMMV" ;) */ >> 226 sos_physmem_setup((mbi->mem_upper<<10) + (1<<20), >> 227 & sos_kernel_core_base_paddr, >> 228 & sos_kernel_core_top_paddr); >> 229 test_physmem(); 063 230 064 /* An operatig system never ends */ 231 /* An operatig system never ends */ 065 for (;;) 232 for (;;) 066 continue; 233 continue; 067 234 068 return; 235 return; 069 } 236 }
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