void main(void) {
clear();
println_newline();
print_colored(" _ _ ", LOGO_NEM_COLOR);
println_colored(" ____ _____", LOGO_OS_COLOR);
print_colored(" | \\ | | ", LOGO_NEM_COLOR);
println_colored("/ __ \\ / ____|", LOGO_OS_COLOR);
print_colored(" | \\| | ___ _ __ ___ ", LOGO_NEM_COLOR);
println_colored("| | | | (___ ", LOGO_OS_COLOR);
print_colored(" | . ` |/ _ \\ '_ ` _ \\", LOGO_NEM_COLOR);
println_colored("| | | |\\___ \\ ", LOGO_OS_COLOR);
print_colored(" | |\\ | __/ | | | | ", LOGO_NEM_COLOR);
println_colored("| |__| |____) |", LOGO_OS_COLOR);
print_colored(" |_| \\_|\\___|_| |_| |_|", LOGO_NEM_COLOR);
println_colored("\\____/|_____/ ", LOGO_OS_COLOR);
println_newline();
initialize_idt();
initialize_keyboard();
while (1);
}
/* Check if MAGIC is valid and print the Multiboot information structure
pointed by ADDR. */
void
entry (unsigned long magic, unsigned long addr)
{
/* Initialize the idt */
init_idt();
multiboot_info_t *mbi;
/* Clear the screen. */
clear();
/* Am I booted by a Multiboot-compliant boot loader? */
if (magic != MULTIBOOT_BOOTLOADER_MAGIC)
{
printf ("Invalid magic number: 0x%#x\n", (unsigned) magic);
return;
}
/* Set MBI to the address of the Multiboot information structure. */
mbi = (multiboot_info_t *) addr;
/* Print out the flags. */
printf ("flags = 0x%#x\n", (unsigned) mbi->flags);
/* Are mem_* valid? */
if (CHECK_FLAG (mbi->flags, 0))
printf ("mem_lower = %uKB, mem_upper = %uKB\n",
(unsigned) mbi->mem_lower, (unsigned) mbi->mem_upper);
/* Is boot_device valid? */
if (CHECK_FLAG (mbi->flags, 1))
printf ("boot_device = 0x%#x\n", (unsigned) mbi->boot_device);
/* Is the command line passed? */
if (CHECK_FLAG (mbi->flags, 2))
printf ("cmdline = %s\n", (char *) mbi->cmdline);
if (CHECK_FLAG (mbi->flags, 3)) {
int mod_count = 0;
int i;
module_t* mod = (module_t*)mbi->mods_addr;
starting_address = mod->mod_start;
while(mod_count < mbi->mods_count) {
printf("Module %d loaded at address: 0x%#x\n", mod_count, (unsigned int)mod->mod_start);
printf("Module %d ends at address: 0x%#x\n", mod_count, (unsigned int)mod->mod_end);
printf("First few bytes of module:\n");
for(i = 0; i<16; i++) {
printf("0x%x ", *((char*)(mod->mod_start+i)));
}
printf("\n");
mod_count++;
mod++;
}
}
/* Bits 4 and 5 are mutually exclusive! */
if (CHECK_FLAG (mbi->flags, 4) && CHECK_FLAG (mbi->flags, 5))
{
printf ("Both bits 4 and 5 are set.\n");
return;
}
/* Is the section header table of ELF valid? */
if (CHECK_FLAG (mbi->flags, 5))
{
elf_section_header_table_t *elf_sec = &(mbi->elf_sec);
printf ("elf_sec: num = %u, size = 0x%#x,"
" addr = 0x%#x, shndx = 0x%#x\n",
(unsigned) elf_sec->num, (unsigned) elf_sec->size,
(unsigned) elf_sec->addr, (unsigned) elf_sec->shndx);
}
/* Are mmap_* valid? */
if (CHECK_FLAG (mbi->flags, 6))
{
memory_map_t *mmap;
printf ("mmap_addr = 0x%#x, mmap_length = 0x%x\n",
(unsigned) mbi->mmap_addr, (unsigned) mbi->mmap_length);
for (mmap = (memory_map_t *) mbi->mmap_addr;
(unsigned long) mmap < mbi->mmap_addr + mbi->mmap_length;
mmap = (memory_map_t *) ((unsigned long) mmap
+ mmap->size + sizeof (mmap->size)))
printf (" size = 0x%x, base_addr = 0x%#x%#x\n"
" type = 0x%x, length = 0x%#x%#x\n",
(unsigned) mmap->size,
(unsigned) mmap->base_addr_high,
(unsigned) mmap->base_addr_low,
(unsigned) mmap->type,
(unsigned) mmap->length_high,
(unsigned) mmap->length_low);
}
/* Construct an LDT entry in the GDT */
{
seg_desc_t the_ldt_desc;
the_ldt_desc.granularity = 0;
the_ldt_desc.opsize = 1;
the_ldt_desc.reserved = 0;
the_ldt_desc.avail = 0;
the_ldt_desc.present = 1;
the_ldt_desc.dpl = 0x0;
the_ldt_desc.sys = 0;
the_ldt_desc.type = 0x2;
SET_LDT_PARAMS(the_ldt_desc, &ldt, ldt_size);
ldt_desc_ptr = the_ldt_desc;
lldt(KERNEL_LDT);
}
/* Construct a TSS entry in the GDT */
{
seg_desc_t the_tss_desc;
the_tss_desc.granularity = 0;
the_tss_desc.opsize = 0;
the_tss_desc.reserved = 0;
the_tss_desc.avail = 0;
the_tss_desc.seg_lim_19_16 = TSS_SIZE & 0x000F0000;
the_tss_desc.present = 1;
the_tss_desc.dpl = 0x0;
the_tss_desc.sys = 0;
the_tss_desc.type = 0x9;
the_tss_desc.seg_lim_15_00 = TSS_SIZE & 0x0000FFFF;
SET_TSS_PARAMS(the_tss_desc, &tss, tss_size);
tss_desc_ptr = the_tss_desc;
tss.ldt_segment_selector = KERNEL_LDT;
tss.ss0 = KERNEL_DS;
tss.esp0 = 0x800000;
ltr(KERNEL_TSS);
}
/* Initialize the PIC */
i8259_init();
/* Initialize devices, memory, filesystem, enable device interrupts on the
* PIC, any other initialization stuff... */
initialize_paging();
/* initialize the RTC to 2Hz */
rtc_initialize();
/* initialize keyboard */
initialize_keyboard();
/* initialize function pointers */
func_init();
/* TESTING FILE SYSTEMS */
init_file_systems(starting_address);
init_terminals();
//printf("Init File Systems Done\n");
//test_file_systems((uint8_t*)"frame0.txt");
//printf("Done testing\n");
/* FINISH FILE SYSTEMS TESTING */
/* Enable interrupts */
/* Do not enable the following until after you have set up your
* IDT correctly otherwise QEMU will triple fault and simple close
* without showing you any output */
printf("Enabling Interrupts\n");
sti();
// testing for changing RTC freq
/*int32_t * freq;
int32_t temp = 1024;
freq = &temp;
rtc_write(freq, 4);
int i;
for(i = 0; i < 10; i ++) {
rtc_read();
printf("testing");
}
temp = 256;
rtc_write(freq, 4);
for (i = 0; i < 20; i++) {
rtc_read();
printf("\n");
printf("second_test");
}*/
/*while(1) {
asm volatile("int $0x28");
}*/
//int d = 6 / 0;
/* Execute the first program (`shell') ... */
clear();
execute((uint8_t*)"shell");
/* Spin (nicely, so we don't chew up cycles) */
asm volatile(".1: hlt; jmp .1;");
}
