jos/kern/env.h

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2018-09-25 09:22:51 -07:00
/* See COPYRIGHT for copyright information. */
#ifndef JOS_KERN_ENV_H
#define JOS_KERN_ENV_H
#include <inc/env.h>
extern struct Env *envs; // All environments
extern struct Env *curenv; // Current environment
extern struct Segdesc gdt[];
void env_init(void);
void env_init_percpu(void);
int env_alloc(struct Env **e, envid_t parent_id);
void env_free(struct Env *e);
void env_create(uint8_t *binary, enum EnvType type);
void env_destroy(struct Env *e); // Does not return if e == curenv
int envid2env(envid_t envid, struct Env **env_store, bool checkperm);
// The following two functions do not return
void env_run(struct Env *e) __attribute__((noreturn));
void env_pop_tf(struct Trapframe *tf) __attribute__((noreturn));
// Without this extra macro, we couldn't pass macros like TEST to
// ENV_CREATE because of the C pre-processor's argument prescan rule.
#define ENV_PASTE3(x, y, z) x ## y ## z
#define ENV_CREATE(x, type) \
do { \
extern uint8_t ENV_PASTE3(_binary_obj_, x, _start)[]; \
env_create(ENV_PASTE3(_binary_obj_, x, _start), \
type); \
} while (0)
#endif // !JOS_KERN_ENV_H