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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
// http://wiki.osdev.org/GDT_Tutorial
//https://wiki.osdev.org/Task_State_Segment
#include <stdint.h>
/** Call this one on each CPU to get a fresh 6-entries GDT
* * 0
* * ring0 code
* * ring0 data
* * ring3 code
* * ring3 data
* * tss
*/
void gdt_init();
/** update tss.esp0 for a given cpu
*/
void install_tss(uint32_t cpu,uint32_t esp0);
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