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kernel: add common functions for user mode

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Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2017-08-30 14:34:14 -07:00 • committed by Andrew Boie
commit 3f091b5dd9
2 changed files with 34 additions and 0 deletions
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24
include/kernel.h
View file

@ -510,6 +510,20 @@ extern k_tid_t k_thread_create(struct k_thread *new_thread,
void *p1, void *p2, void *p3,
int prio, u32_t options, s32_t delay);
#ifdef CONFIG_USERSPACE
/**
* @brief Drop a thread's privileges permanently to user mode
*
* @param entry Function to start executing from
* @param p1 1st entry point parameter
* @param p2 2nd entry point parameter
* @param p3 3rd entry point parameter
*/
extern FUNC_NORETURN void k_thread_user_mode_enter(k_thread_entry_t entry,
void *p1, void *p2,
void *p3);
#endif
/**
* @brief Put the current thread to sleep.
*
@ -3892,6 +3906,16 @@ extern void _sys_power_save_idle_exit(s32_t ticks);
*/
static inline int _arch_is_user_context(void);
/**
* Indicate whether the CPU is currently in user mode
*
* @return nonzero if the CPU is currently running with user permissions
*/
static inline int _is_user_context(void)
{
return _arch_is_user_context();
}
/* Interfaces for invoking system calls */
static inline u32_t _arch_syscall_invoke5(u32_t arg1, u32_t arg2, u32_t arg3,
u32_t arg4, u32_t arg5,

10
kernel/thread.c
View file

@ -500,3 +500,13 @@ void _k_thread_group_leave(u32_t groups, struct k_thread *thread)
thread_data->init_groups &= groups;
}
#ifdef CONFIG_USERSPACE
FUNC_NORETURN void k_thread_user_mode_enter(k_thread_entry_t entry,
void *p1, void *p2, void *p3)
{
_current->base.user_options |= K_USER;
_thread_essential_clear();
_arch_user_mode_enter(entry, p1, p2, p3);
}
#endif /* CONFIG_USERSPACE */