#include "alloc.h" #include "exception.h" #include "gdt.h" #include "idt.h" #include "interrupt.h" #include "io.h" #include "irq.h" #include "klibc.h" #include "kthread.h" #include "mem.h" #include "multiboot.h" #include "paging.h" #include "pit.h" #include "serial.h" #include "stack.h" #include "stdarg.h" #ifdef RUN_TEST #include "test.h" #endif #include "time.h" #include "types.h" #include "vga.h" #define CHECK_FLAG(flags, bit) ((flags) & (1 << (bit))) void idleThread(void *arg) { (void)arg; while (1) { printIntDetails((jiffies / HZ), GREEN, BLACK, 0, VGA_HEIGHT - 1); kthreadYield(); } } // Multiboot information available here : // https://www.gnu.org/software/grub/manual/multiboot/multiboot.html#kernel_002ec // https://www.gnu.org/software/grub/manual/multiboot/html_node/Boot-information-format.html#Boot%20information%20format void kmain(unsigned long magic, unsigned long addr) { unsigned long upperMemKB = 0; int memMapAvailable = 0; paddr_t lastUsedByMem; VGASetup(BLACK, GREEN); cursorEnable(14, 15); printf("Setting up Interruptions\n"); gdtSetup(); idtSetup(); irqSetup(); pitSetup(HZ); if (magic == MULTIBOOT_BOOTLOADER_MAGIC) { // Get loaded by Grub with mutliboot version 1 multiboot_info_t *mbi = (multiboot_info_t *)addr; /* Are mem_* valid? */ if (CHECK_FLAG(mbi->flags, 0)) { printf("mem_lower = %dKiB mem_upper %dKiB\n", mbi->mem_lower, mbi->mem_upper); upperMemKB = mbi->mem_upper; } /* Is boot_device valid? */ if (CHECK_FLAG(mbi->flags, 1)) { printf("boot_device = %d\n", 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)) { multiboot_module_t *mod; uint32_t i; printf("mods_count = %d, mods_addr = 0x%x\n", (int)mbi->mods_count, (int)mbi->mods_addr); for (i = 0, mod = (multiboot_module_t *)mbi->mods_addr; i < mbi->mods_count; i++, mod++) printf(" mod_start = 0x%x, mod_end = 0x%x, cmdline = %s\n", (unsigned)mod->mod_start, (unsigned)mod->mod_end, (char *)mod->cmdline); } if (CHECK_FLAG(mbi->flags, 6)) { memMapAvailable = 1; } } if (upperMemKB == 0) { printf("Cannot get upper phy mem bound. Using default value 32MB\n"); upperMemKB = 32 * 1024; } printf("Setting up Mem\n"); memSetup(upperMemKB, &lastUsedByMem); if (memMapAvailable) { multiboot_info_t *mbi = (multiboot_info_t *)addr; struct multiboot_mmap_entry *mmap = (struct multiboot_mmap_entry *)mbi->mmap_addr; uint size = mbi->mmap_length / sizeof(struct multiboot_mmap_entry); pr_devel("mmap buffer at 0x%x with %d entries\n", mbi->mmap_addr, size); for (uint i = 0; i < size; i++) { printf(" base_addr 0x%llx, length = 0x%llx, type = 0x%x\n", mmap[i].addr, mmap[i].len, (uint32_t)mmap[i].type); memAddBank(max(mmap[i].addr, (multiboot_uint64_t)lastUsedByMem), mmap[i].addr + mmap[i].len, mmap[i].type == MULTIBOOT_MEMORY_AVAILABLE); } } else { printf("Cannot get memory Mapping information, using default value\n"); memAddBank(0, lastUsedByMem, 0); memAddBank(lastUsedByMem, upperMemKB * 1024, 1); } #ifdef RUN_TEST testPhymem(); #endif printf("Setting up Pagination\n"); pagingSetup(lastUsedByMem); printf("Setting up IRQ handlers\n"); irqSetRoutine(IRQ_KEYBOARD, keyboard_handler); printf("Enabling HW interrupts\n"); // Enabling the HW interrupts exceptionSetup(); asm volatile("sti\n"); printf("Setting up Serial link (115200)\n"); serialSetup(115200); allocSetup(); kthreadSetup(_stack_bottom, (_stack_top - _stack_bottom + 1)); kthreadCreate("idle ", idleThread, NULL); irqSetRoutine(IRQ_TIMER, pit_handler); #ifdef RUN_TEST run_test(); #endif printf("\nSystem init done: "); { uint free, used; memGetStat(&free, &used); printf("%dKB free %dKB Used\n", free * (PAGE_SIZE / 1024), used * (PAGE_SIZE / 1024)); } // There is no real caller behind this point // So finish this by ourself kthreadExit(); }