#define FOOLOS_MODULE_NAME "kernel"

#ifdef __linux__
#error "Watchout! this is not Linux but FoolOS. Use a cross-compiler"
#endif

#include "kernel.h"

#include <stdint.h>
#include "config.h"
#include "types.h"
#include "lib/logger/log.h"

#include "timer.h"
#include "mem.h"
#include "vmem.h"
#include "interrupts.h"
#include "multiboot.h"

#include "console.h"

#include <stddef.h> 

// for built-in shell
#include "lib/buffer/ringbuffer.h"
#include "task.h"
#include "video/vesa.h"

void kernel_main(uint32_t eax,uint32_t ebx)
{
    //
    // PR
    //

    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"%s",KERNEL_VERSION);

    //
    // Configuring the PIT timer.
    //
    
    timer_init();

    // 
    // Process Multiboot Header
    //
    
    if(eax!=0x2badb002)panic(FOOLOS_MODULE_NAME,"EAX was not set properly by your bootlaoder!");

    multiboot_information *info;
    info=ebx;
    if(info->flags&&1<<9)
    {
	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"Loaded by: \"%s\"",info->boot_loader_name);
    }

    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"multiboot flags: 0x%08X",info->flags);

    if(info->flags&&1<<0)
    {
	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"mem_lower: %d KB",info->mem_lower);
	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"mem_upper: %d KB",info->mem_upper);
    }

    if(info->flags&&1<<2)
    {
	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"cmdline: \"%s\"",info->cmdline);
    }

    //
    //	Memory Init
    //
    //  after this is set up we will be able to allocate and deallocate 
    //  blocks of physical memory :)
    //
    //	we know that here, the bootloader placed the memory map and
    //	its length
    //

    if(info->flags&&1<<6)
    {
	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"memory map of length %d provided by bootloader",info->mmap_length);
	mem_init(info->mmap_addr,info->mmap_length);
    }

    else panic(FOOLOS_MODULE_NAME,"Unable to continue without memory map, sorry!");

    // 
    // Modules
    //
    
    if(info->flags&&1<<3)
    {
	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"%d modules loaded",info->mods_count);

	multiboot_mod *mod=info->mods_addr;

	for(int i=0;i<info->mods_count;i++)
	{
	    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"mod at 0x%08X-0x%08X : %s", 
		    mod->mod_start,mod->mod_end, mod->string);
		    
	    mod++;
	}
    }

    //
    // Video
    //
    
    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"VBE Info: 0x%04X (0x%08X 0x%08X)",info->vbe_mode,info->vbe_control_info, info->vbe_mode_info);
    vbeinfo *vbe=info->vbe_mode_info;
    //log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"%c%c",'X',vbe->VbeSignature[0]);
   /*
   uint16_t VbeVersion;                 // == 0x0300 for VBE 3.0
   uint16_t OemStringPtr[2];            // isa vbeFarPtr
   uint8_t Capabilities[4];
   uint16_t VideoModePtr[2];         // isa vbeFarPtr
   uint16_t TotalMemory;             // as # of 64KB blocks
   */
    

    //
    // init output to screen
    // 
    
    uint32_t physbase=console_init(info->vbe_mode_info,info->vbe_control_info);


    //
    // Activate Virtual Memory (paging)
    //
    pdirectory *dir=vmem_init(physbase);


    // log buffered messages to console
    log_log();
    while(1);

    //
    // Setup Interrupts (code segment: 0x08)
    //
    
    int_init(0x08);


    //
    // Scan the PCI Bus
    // 
    // We are interested in the E1000 Network Adapter in particular
    // Its driver will be hopefully implemented one day ;) TODO
    //
    //pci_init();
   

    //
    // Gather Info about other processors. (APs)
    // ACPI or MP
    //
    //
    /*
    smp_processors procdata;    

    if(!acpi_find(&procdata))
	if(!mp_find(&procdata))
	    panic(FOOLOS_MODULE_NAME,"ACPI and MP search failed! I do not want to continue!");
    */
    // 
    // Start the other Processors (also before paging for some reason!)
    //
    //smp_log_procdata(&procdata);
    //smp_start_aps(&procdata,0x80000);	// starts at 0x80000 
					// but it will be copied over mbr

    //
    // Initialize Multitasking
    //
    task_init(dir); //; this will never return!
    //
 
}