os/kernel/kernel.c

#include "../cpu/cpu_init.h"
#include "../drivers/vga.h"
#include "../drivers/pci.h"
#include "../drivers/serial.h"
#include "../cpu/i386/ports.h"
#include "vfs.h"
#include "../fs/devfs.h"
#include "../fs/initrd.h"
#include <grub/text_fb_info.h>
#include <stdlib.h>
#include <tasking.h>
#include <string.h>
#include <memory.h>
#include <grub/multiboot.h>
#include "klog.h"
#include "elf.h"
#include <errno.h>
#include "../drivers/ide.h"
#include "../fs/ext2.h"

static long initrd_sz;
static char* initrd;
static multiboot_info_t* mbd;
typedef int (*func_ptr)();

static int console_dev_drv(char* filename,int c,long pos,char wr) {
  if (wr) {
    if (c=='\f') {
      vga_clear();
    } else if (c=='\b') {
      vga_backspace();
    }
    char str[2];
    str[0]=(char)c;
    str[1]='\0';
    vga_write_string(str);
    return 0;
  } else {
    return 0;
    // return devbuf_get(kbd_buf);
  }
}

static int initrd_dev_drv(char* filename,int c,long pos,char wr) {
  if (wr) {
    return 0;
  }
  if (pos>=initrd_sz) {
    return EOF;
  }
  return initrd[pos];
}

static void read_initrd(multiboot_info_t* mbd) {
  if ((mbd->flags&MULTIBOOT_INFO_MODS)!=0) {
    uint32_t mods_count=mbd->mods_count;
    if (mods_count>0) {
      while (mods_count>0) {
        multiboot_module_t* mods_addr=(multiboot_module_t*)(mbd->mods_addr+0xC0000000);
        if (strcmp((char*)(mods_addr->cmdline+0xC0000000),"initrd")==0) {
          initrd=malloc(sizeof(char)*(mods_addr->mod_end-mods_addr->mod_start));
          initrd_sz=(mods_addr->mod_end-mods_addr->mod_start);
          memcpy(initrd,(void*)mods_addr->mod_start+0xC0000000,initrd_sz);
        };
        mods_count--;
      }
    }
  } else {
    klog("PANIC","Cannnot load initrd. No modules found!");
    for(;;) {}
  }
  if (!initrd) {
    klog("PANIC","Cannnot load initrd. Initrd module not found!");
    for(;;) {}
  }
}

static void init() {
  init_vfs();
  init_devfs();
  devfs_add(console_dev_drv,"console");
  stdout=fopen("/dev/console","w");
  stdin=fopen("/dev/console","r");
  stderr=fopen("/dev/console","w");
  read_initrd(mbd);
  devfs_add(initrd_dev_drv,"initrd");
  initrd_init();
  mount("/initrd/","","initrd");
  // Detect PCI
  port_long_out(0xCF8,(1<<31));
  uint32_t word=port_long_in(0xCFC);
  port_long_out(0xCF8,(1<<31)|0x4);
  if (word!=port_long_in(0xCFC)) {
    // pci_init();
  }
  // Detect and initailize serial ports
  serial_init();
  FILE* file=fopen("/initrd/prog.elf","r");
  elf_header header;
  fread(&header,sizeof(elf_header),1,file);
  if (header.magic!=ELF_MAGIC) {
    klog("INFO","Invalid magic number for prog.elf");
    fclose(file);
  } else {
    fseek(file,header.prog_hdr,SEEK_SET);
    elf_pheader pheader;
    fread(&pheader,sizeof(elf_pheader),1,file);
    alloc_memory_virt(1,(void*)pheader.vaddr);
    fseek(file,pheader.offset,SEEK_SET);
    fread((void*)pheader.vaddr,pheader.filesz,1,file);
    klog("INFO","VADDR:%x",pheader.vaddr);
    func_ptr prog=(func_ptr)header.entry;
    int val=prog();
    klog("INFO","RAN PROG:%d",val);
  }
  ide_init();
  load_parts("/dev/hda");
  init_ext2();
  mount("/","/dev/hda1","ext2");
  klog("INFO","MOUNT");
  FILE* f=fopen("/file","r");
  char str[256];
  fgets(str,256,f);
  str[strlen(str)-1]='\0';
  klog("INFO","Got string %s",str);
  for(;;) {
    yield();
  }
}

void kmain(multiboot_info_t* header) {
  mbd=header;
  cpu_init(mbd);
  text_fb_info info;
  if (header->flags&MULTIBOOT_INFO_FRAMEBUFFER_INFO&&header->framebuffer_type==2) {
    info.address=(char*)(((uint32_t)header->framebuffer_addr&0xFFFFFFFF)+0xC0000000);
    info.width=header->framebuffer_width;
    info.height=header->framebuffer_height;
  } else {
    info.address=(char*)0xC00B8000;
    info.width=80;
    info.height=25;
  }
  vga_init(info);
  createTask(init);
  for (;;) {
    yield();
  }
}