#define FOOLOS_MODULE_NAME "kernel"

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

#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"


void kernel_main(uint32_t eax,uint32_t ebx)
{

    
    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"kernel_main: eax=0x%08X ebx=0x%08X",eax,ebx);

    //
    // 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);
    }

    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++;
	}
    }

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

	uint32_t mmap_addr=info->mmap_addr;

	while(mmap_addr<info->mmap_addr+info->mmap_length)
	{
	    multiboot_mmap *mmap=mmap_addr;
	    uint32_t mem_start=mmap->base_addr;
	    uint32_t mem_end=mmap->base_addr+mmap->length;

	    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"%08X - %08X / type: %d, size: %d",
		    mem_start, mem_end, mmap->type, mmap->size);

	    mmap_addr+=mmap->size+4;
	}

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

    //
    //	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
    //	the number of entries.
    //
//    mem_init((physical_address)0xa001,(int)(*((uint16_t *)(0xa000))));
    

    //
    // init output to screen
    // 
    uint32_t physbase=console_init();


    //
    // 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!
 
}