60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
|
/* See COPYRIGHT for copyright information. */
|
||
|
|
|
||
|
|
#ifndef JOS_INC_ENV_H
|
||
|
|
#define JOS_INC_ENV_H
|
||
|
|
|
||
|
|
#include <inc/types.h>
|
||
|
|
#include <inc/trap.h>
|
||
|
|
#include <inc/memlayout.h>
|
||
|
|
|
||
|
|
typedef int32_t envid_t;
|
||
|
|
|
||
|
|
// An environment ID 'envid_t' has three parts:
|
||
|
|
//
|
||
|
|
// +1+---------------21-----------------+--------10--------+
|
||
|
|
// |0| Uniqueifier | Environment |
|
||
|
|
// | | | Index |
|
||
|
|
// +------------------------------------+------------------+
|
||
|
|
// \--- ENVX(eid) --/
|
||
|
|
//
|
||
|
|
// The environment index ENVX(eid) equals the environment's index in the
|
||
|
|
// 'envs[]' array. The uniqueifier distinguishes environments that were
|
||
|
|
// created at different times, but share the same environment index.
|
||
|
|
//
|
||
|
|
// All real environments are greater than 0 (so the sign bit is zero).
|
||
|
|
// envid_ts less than 0 signify errors. The envid_t == 0 is special, and
|
||
|
|
// stands for the current environment.
|
||
|
|
|
||
|
|
#define LOG2NENV 10
|
||
|
|
#define NENV (1 << LOG2NENV)
|
||
|
|
#define ENVX(envid) ((envid) & (NENV - 1))
|
||
|
|
|
||
|
|
// Values of env_status in struct Env
|
||
|
|
enum {
|
||
|
|
ENV_FREE = 0,
|
||
|
|
ENV_DYING,
|
||
|
|
ENV_RUNNABLE,
|
||
|
|
ENV_RUNNING,
|
||
|
|
ENV_NOT_RUNNABLE
|
||
|
|
};
|
||
|
|
|
||
|
|
// Special environment types
|
||
|
|
enum EnvType {
|
||
|
|
ENV_TYPE_USER = 0,
|
||
|
|
};
|
||
|
|
|
||
|
|
struct Env {
|
||
|
|
struct Trapframe env_tf; // Saved registers
|
||
|
|
struct Env *env_link; // Next free Env
|
||
|
|
envid_t env_id; // Unique environment identifier
|
||
|
|
envid_t env_parent_id; // env_id of this env's parent
|
||
|
|
enum EnvType env_type; // Indicates special system environments
|
||
|
|
unsigned env_status; // Status of the environment
|
||
|
|
uint32_t env_runs; // Number of times environment has run
|
||
|
|
|
||
|
|
// Address space
|
||
|
|
pde_t *env_pgdir; // Kernel virtual address of page dir
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif // !JOS_INC_ENV_H
|