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// https://xarnze.com/posts/post/Tutorial:%20Entering%20User%20mode
// http://wiki.osdev.org/TSS
// http://wiki.osdev.org/Global_Descriptor_Table
typedef volatile struct strtss{
unsigned short link;
unsigned short link_h;
unsigned long esp0;
unsigned short ss0;
unsigned short ss0_h;
unsigned long esp1;
unsigned short ss1;
unsigned short ss1_h;
unsigned long esp2;
unsigned short ss2;
unsigned short ss2_h;
unsigned long cr3;
unsigned long eip;
unsigned long eflags;
unsigned long eax;
unsigned long ecx;
unsigned long edx;
unsigned long ebx;
unsigned long esp;
unsigned long ebp;
unsigned long esi;
unsigned long edi;
unsigned short es;
unsigned short es_h;
unsigned short cs;
unsigned short cs_h;
unsigned short ss;
unsigned short ss_h;
unsigned short ds;
unsigned short ds_h;
unsigned short fs;
unsigned short fs_h;
unsigned short gs;
unsigned short gs_h;
unsigned short ldt;
unsigned short ldt_h;
unsigned short trap;
unsigned short iomap;
}__attribute__((packed)) tss_struct;
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