/* See COPYRIGHT for copyright information. */

#ifndef _ENV_H_
#define _ENV_H_

#include <inc/types.h>
#include <inc/queue.h>
#include <inc/trap.h>
#include <inc/pmap.h>

#define LOG2NENV		10
#define NENV			(1<<LOG2NENV)
#define ENVX(envid)		((envid) & (NENV - 1))

// Values of env_status in struct Env
#define ENV_FREE		0
#define ENV_RUNNABLE		1
#define ENV_NOT_RUNNABLE	2

struct Env {
	struct Trapframe env_tf;        // Saved registers
	LIST_ENTRY(Env) env_link;       // Free list link pointers
	u_int env_id;                   // Unique environment identifier
	u_int env_parent_id;            // env_id of this env's parent
	u_int env_status;               // Status of the environment

	// Address space
	Pde  *env_pgdir;                // Kernel virtual address of page dir
	u_int env_cr3;                  // Physical address of page dir

};

#endif // !_ENV_H_