123 lines
3.9 KiB
C
123 lines
3.9 KiB
C
#include "alloc.h"
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#include "exception.h"
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#include "gdt.h"
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#include "idt.h"
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#include "interrupt.h"
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#include "io.h"
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#include "irq.h"
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#include "klibc.h"
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#include "mem.h"
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#include "multiboot.h"
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#include "paging.h"
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#include "pit.h"
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#include "serial.h"
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#include "stdarg.h"
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#ifdef RUN_TEST
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#include "test.h"
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#endif
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#include "types.h"
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#include "vga.h"
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#define CHECK_FLAG(flags, bit) ((flags) & (1 << (bit)))
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void cpuid(int code, uint32_t *a, uint32_t *d)
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{
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asm volatile("cpuid" : "=a"(*a), "=d"(*d) : "0"(code) : "ebx", "ecx");
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}
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// Multiboot information available here :
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// https://www.gnu.org/software/grub/manual/multiboot/multiboot.html#kernel_002ec
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// https://www.gnu.org/software/grub/manual/multiboot/html_node/Boot-information-format.html#Boot%20information%20format
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void kmain(unsigned long magic, unsigned long addr)
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{
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unsigned long upper_mem = 0;
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VGASetup(BLACK, GREEN);
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cursorEnable(14, 15);
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printf("Setting up Interruptions\n");
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gdtSetup();
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idtSetup();
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irqSetup();
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pitSetup(100);
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if (magic == MULTIBOOT_BOOTLOADER_MAGIC) { // Get loaded by Grub with mutliboot version 1
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multiboot_info_t *mbi = (multiboot_info_t *)addr;
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/* Are mem_* valid? */
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if (CHECK_FLAG(mbi->flags, 0)) {
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printf("mem_lower = %dKiB mem_upper %dKiB\n", mbi->mem_lower, mbi->mem_upper);
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upper_mem = mbi->mem_upper;
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}
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/* Is boot_device valid? */
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if (CHECK_FLAG(mbi->flags, 1)) {
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printf("boot_device = %d\n", mbi->boot_device);
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}
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/* Is the command line passed? */
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if (CHECK_FLAG(mbi->flags, 2)) {
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printf("cmdline = %s\n", (char *)mbi->cmdline);
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}
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if (CHECK_FLAG(mbi->flags, 3)) {
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multiboot_module_t *mod;
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uint32_t i;
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printf("mods_count = %d, mods_addr = 0x%x\n", (int)mbi->mods_count,
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(int)mbi->mods_addr);
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for (i = 0, mod = (multiboot_module_t *)mbi->mods_addr; i < mbi->mods_count;
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i++, mod++)
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printf(" mod_start = 0x%x, mod_end = 0x%x, cmdline = %s\n",
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(unsigned)mod->mod_start, (unsigned)mod->mod_end, (char *)mod->cmdline);
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}
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if (CHECK_FLAG(mbi->flags, 6)) {
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struct multiboot_mmap_entry *mmap = (struct multiboot_mmap_entry *)mbi->mmap_addr;
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uint size = mbi->mmap_length / sizeof(struct multiboot_mmap_entry);
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printf("mmap buffer at %d size %d %d\n", mbi->mmap_addr, mbi->mmap_length,
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sizeof(multiboot_memory_map_t));
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for (uint i = 0; i < size; i++) {
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printf("base_addr_high = 0x%x, base_addr_low = 0x%x, "
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"length_high = 0x%x, length_low = 0x%x, type = 0x%x\n",
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(unsigned)(mmap[i].addr >> 32), (unsigned)(mmap[i].addr & 0xffffffff),
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(unsigned)(mmap[i].len >> 32), (unsigned)(mmap[i].len & 0xffffffff),
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(uint32_t)mmap[i].type);
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}
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}
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}
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if (upper_mem == 0) {
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printf("Cannot get upper phy mem bound. Using default value 32MB\n");
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upper_mem = 32 * 1024;
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}
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printf("Setting up Pagination\n");
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paddr_t lastUserByMem;
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memSetup(upper_mem, &lastUserByMem);
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#ifdef RUN_TEST
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testPhymem();
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#endif
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pagingSetup(lastUserByMem);
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printf("Setting up IRQ handlers\n");
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irqSetRoutine(IRQ_KEYBOARD, keyboard_handler);
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irqSetRoutine(IRQ_TIMER, timer_handler);
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printf("Enabling HW interrupts\n");
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exceptionSetRoutine(EXCEPTION_DOUBLE_FAULT, print_handler);
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exceptionSetRoutine(EXCEPTION_PAGE_FAULT, pagefault_handler);
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// Enabling the HW interrupts
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asm volatile("sti\n");
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printf("Setting up Serial link (115200)\n");
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serialSetup(115200);
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allocInit();
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#ifdef RUN_TEST
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run_test();
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#endif
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int count = 0;
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while (1) {
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printIntDetails(count++, GREEN, BLACK, 0, VGA_HEIGHT - 1);
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}
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printf("exiting\n");
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}
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