#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 "asm/asm.h" // TODO: ?!?!

#include "lib/logger/log.h"
#include "lib/buffer/ringbuffer.h"

#include "timer.h"
#include "spinlock.h"
#include "syscalls.h"
#include "mem.h"
#include "vmem.h"
#include "interrupts.h"
#include "keyboard.h"
#include "console.h"

#include "fs/fs.h"
#include "fs/ext2.h"

#include "task.h"

#include <stdint.h>
#include <stdlib.h>


// CODE FOR Stack Smashing Protector, TODO: MOVE / and do not duplicate
// with sys.c
// http://wiki.osdev.org/Stack_Smashing_Protector
 
#if UINT32_MAX == UINTPTR_MAX
#define STACK_CHK_GUARD 0xe2dee396
#else
#define STACK_CHK_GUARD 0x595e9fbd94fda766
#endif
 
uintptr_t __stack_chk_guard = STACK_CHK_GUARD;
 
__attribute__((noreturn))
void __stack_chk_fail(void)
{
	panic(FOOLOS_MODULE_NAME,"Stack smashing detected");
}

// mp informs us if this if this is the main processor
void kernel_main(uint32_t initial_stack, int mp)
{
    //
    //	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(0xa001,*((uint16_t *)(0xa000)));

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

    //
    // Activate Virtual Memory (paging)
    //
    vmem_init();

    //
    // init output to screen
    // 
    console_init();


    // log buffered messages to console
    log_log();


    //
    //  Setup PIC (interrupts)
    //
    pic_setup();


    // mouse and kb driver init (before interrupts)
    // mouse_init();
    keyboard_init();


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

    //
    // 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!");
    */

    // init spinlocks
    init_spinlocks();


    // ringbuffer for stdin!
    ringbuffer_init();

    // load and run foolshell
    // we will come back into the kernel only on interrupts...
    asm("mov $0x05bff,%esp"); // set stack pointer
    syscall_execve("/bin/foolshell",0,0); 


    // 
    // 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
					

    //
    // 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();

    //
    // Initialize Multitasking
    //
    // For now this starts three "tasks" which are scheduled 
    // round robin style.
    //

    //task_init();

    // Just hang around here, if its reached. 
    // we do our tasks anyway. on the next clock tick.
    // while(1);
   
 
}