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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/klibc.h> 022 #include <sos/klibc.h> 028 #include <sos/assert.h> 023 #include <sos/assert.h> 029 #include <drivers/x86_videomem.h> 024 #include <drivers/x86_videomem.h> 030 #include <drivers/bochs.h> 025 #include <drivers/bochs.h> 031 026 032 027 033 /* Helper function to display each bits of a 3 << 034 screen as dark or light carrets */ << 035 static void display_bits(unsigned char row, un << 036 unsigned char attribu << 037 sos_ui32_t integer) << 038 { << 039 int i; << 040 /* Scan each bit of the integer, MSb first * << 041 for (i = 31 ; i >= 0 ; i--) << 042 { << 043 /* Test if bit i of 'integer' is set */ << 044 int bit_i = (integer & (1 << i)); << 045 /* Ascii 219 => dark carret, Ascii 177 = << 046 unsigned char ascii_code = bit_i?219:177 << 047 sos_x86_videomem_putchar(row, col++, << 048 attribute, << 049 ascii_code); << 050 } << 051 } << 052 << 053 << 054 /* Clock IRQ handler */ << 055 static void clk_it(int intid) << 056 { << 057 static sos_ui32_t clock_count = 0; << 058 << 059 display_bits(0, 48, << 060 SOS_X86_VIDEO_FG_LTGREEN | SOS_ << 061 clock_count); << 062 clock_count++; << 063 << 064 } << 065 << 066 /* Division by zero exception handler */ << 067 static void divide_ex(int exid) << 068 { << 069 static sos_ui32_t div_count = 0; << 070 display_bits(0, 0, << 071 SOS_X86_VIDEO_FG_LTRED | SOS_X8 << 072 div_count); << 073 div_count++; << 074 } << 075 028 076 /* The C entry point of our operating system * 029 /* The C entry point of our operating system */ 077 void sos_main(unsigned long magic, unsigned lo 030 void sos_main(unsigned long magic, unsigned long addr) 078 { 031 { 079 unsigned i; 032 unsigned i; 080 033 081 /* Grub sends us a structure, called multibo 034 /* Grub sends us a structure, called multiboot_info_t with a lot of 082 precious informations about the system, s 035 precious informations about the system, see the multiboot 083 documentation for more information. */ 036 documentation for more information. */ 084 multiboot_info_t *mbi; 037 multiboot_info_t *mbi; 085 mbi = (multiboot_info_t *) addr; 038 mbi = (multiboot_info_t *) addr; 086 039 087 /* Setup bochs and console, and clear the co 040 /* Setup bochs and console, and clear the console */ 088 sos_bochs_setup(); 041 sos_bochs_setup(); 089 042 090 sos_x86_videomem_setup(); 043 sos_x86_videomem_setup(); 091 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 044 sos_x86_videomem_cls(SOS_X86_VIDEO_BG_BLUE); 092 045 093 /* Greetings from SOS */ 046 /* Greetings from SOS */ 094 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 047 if (magic == MULTIBOOT_BOOTLOADER_MAGIC) 095 /* Loaded with Grub */ 048 /* Loaded with Grub */ 096 sos_x86_videomem_printf(1, 0, 049 sos_x86_videomem_printf(1, 0, 097 SOS_X86_VIDEO_FG_Y 050 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 098 "Welcome From GRUB 051 "Welcome From GRUB to %s%c RAM is %dMB (upper mem = 0x%x kB)", 099 "SOS", ',', 052 "SOS", ',', 100 (unsigned)(mbi->me 053 (unsigned)(mbi->mem_upper >> 10) + 1, 101 (unsigned)mbi->mem 054 (unsigned)mbi->mem_upper); 102 else 055 else 103 /* Not loaded with grub */ 056 /* Not loaded with grub */ 104 sos_x86_videomem_printf(1, 0, 057 sos_x86_videomem_printf(1, 0, 105 SOS_X86_VIDEO_FG_Y 058 SOS_X86_VIDEO_FG_YELLOW | SOS_X86_VIDEO_BG_BLUE, 106 "Welcome to SOS"); 059 "Welcome to SOS"); 107 060 108 sos_bochs_putstring("Message in a bochs\n"); 061 sos_bochs_putstring("Message in a bochs\n"); 109 062 110 /* Setup CPU segmentation and IRQ subsystem !! 063 111 sos_gdt_setup(); !! 064 /* An operatig system never ends */ 112 sos_idt_setup(); !! 065 for (;;) 113 !! 066 continue; 114 /* Setup SOS IRQs and exceptions subsystem * << 115 sos_exceptions_setup(); << 116 sos_irq_setup(); << 117 << 118 /* Configure the timer so as to raise the IR << 119 sos_i8254_set_frequency(100); << 120 << 121 /* Binding some HW interrupts and exceptions << 122 sos_irq_set_routine(SOS_IRQ_TIMER, << 123 clk_it); << 124 sos_exception_set_routine(SOS_EXCEPT_DIVIDE_ << 125 divide_ex); << 126 /* Enabling the HW interrupts here, this wil << 127 interrupt call our clk_it handler */ << 128 asm volatile ("sti\n"); << 129 << 130 /* Raise a rafale of 'division by 0' excepti << 131 not really needed (equivalent to a bare " << 132 compiling with -O3: "i=1/0;" is considere << 133 -O3. */ << 134 i = 10; << 135 while (1) << 136 { << 137 /* Stupid function call to fool gcc opti << 138 sos_bochs_printf("i = 1 / %d...\n", i); << 139 i = 1 / i; << 140 } << 141 << 142 /* Will never print this since the "divide b << 143 returns to the faulting instruction (see << 144 section 5.12), thus re-evaluating the "di << 145 and raising the "divide by zero" exceptio << 146 sos_x86_videomem_putstring(2, 0, << 147 SOS_X86_VIDEO_FG_ << 148 "Invisible"); << 149 067 150 return; 068 return; 151 } 069 }
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