147 lines
4.4 KiB
C
147 lines
4.4 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 "kthread.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 "stack.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 "time.h"
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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 idleThread(void *arg)
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{
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(void)arg;
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while (1) {
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printIntDetails((jiffies / HZ), GREEN, BLACK, 0, VGA_HEIGHT - 1);
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kthreadYield();
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}
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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 upperMemKB = 0;
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int memMapAvailable = 0;
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paddr_t lastUsedByMem;
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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(HZ);
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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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upperMemKB = 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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memMapAvailable = 1;
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}
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}
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if (upperMemKB == 0) {
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printf("Cannot get upper phy mem bound. Using default value 32MB\n");
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upperMemKB = 32 * 1024;
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}
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printf("Setting up Mem\n");
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memSetup(upperMemKB, &lastUsedByMem);
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if (memMapAvailable) {
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multiboot_info_t *mbi = (multiboot_info_t *)addr;
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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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pr_devel("mmap buffer at 0x%x with %d entries\n", mbi->mmap_addr, size);
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for (uint i = 0; i < size; i++) {
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printf(" base_addr 0x%llx, length = 0x%llx, type = 0x%x\n", mmap[i].addr,
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mmap[i].len, (uint32_t)mmap[i].type);
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memAddBank(max(mmap[i].addr, (multiboot_uint64_t)lastUsedByMem),
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mmap[i].addr + mmap[i].len, mmap[i].type == MULTIBOOT_MEMORY_AVAILABLE);
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}
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} else {
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printf("Cannot get memory Mapping information, using default value\n");
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memAddBank(0, lastUsedByMem, 0);
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memAddBank(lastUsedByMem, upperMemKB * 1024, 1);
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}
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#ifdef RUN_TEST
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testPhymem();
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#endif
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printf("Setting up Pagination\n");
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pagingSetup(lastUsedByMem);
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printf("Setting up IRQ handlers\n");
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irqSetRoutine(IRQ_KEYBOARD, keyboard_handler);
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printf("Enabling HW interrupts\n");
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// Enabling the HW interrupts
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exceptionSetup();
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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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allocSetup();
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kthreadSetup(_stack_bottom, (_stack_top - _stack_bottom + 1));
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kthreadCreate("idle ", idleThread, NULL);
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irqSetRoutine(IRQ_TIMER, pit_handler);
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#ifdef RUN_TEST
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run_test();
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#endif
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printf("\nSystem init done: ");
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{
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uint free, used;
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memGetStat(&free, &used);
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printf("%dKB free %dKB Used\n", free * (PAGE_SIZE / 1024), used * (PAGE_SIZE / 1024));
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}
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// There is no real caller behind this point
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// So finish this by ourself
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kthreadExit();
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}
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