kernel/usermode.c


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#include "usermode.h"

#include "syscalls.h"
#include "kmalloc.h"

#include "asm/usermode.h"
#include "asm/x86.h"
#include "scheduler.h"
#include "kernel.h"
#include "fs/elf.h"

#include <stddef.h>

void userfunc()
{

    // we need enable here again (since the pushed eflags have it disabled)!
    x86_sti(); 

    // if we are pid 0, replace ourselves with /bin/init and enter usermode
    if(task_get_current_pid()==0)
    {
	    uint32_t alloc;
	    uint32_t entry_global=load_elf(BIN_INIT,&alloc);
	    task_set_brk(alloc);
	    asm_usermode(entry_global); 
    }

    // kernel worker thread: SLEEPER
    if(task_get_current_pid()==1)
    {
	while(1)
	{
	    __asm__("hlt");
	}
    }

    // kernel worker thread: SYSCALL CHECKER
    if(task_get_current_pid()==2)
    {
        task_syscall_worker();
    }
}