asce.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2
 3#ifndef _ASM_S390_ASCE_H
 4#define _ASM_S390_ASCE_H
 5
 6#include <linux/thread_info.h>
 7#include <linux/irqflags.h>
 8#include <asm/lowcore.h>
 9#include <asm/ctlreg.h>
10
11static inline bool enable_sacf_uaccess(void)
12{
13	unsigned long flags;
14
15	if (test_thread_flag(TIF_ASCE_PRIMARY))
16		return true;
17	local_irq_save(flags);
18	local_ctl_load(1, &get_lowcore()->kernel_asce);
19	set_thread_flag(TIF_ASCE_PRIMARY);
20	local_irq_restore(flags);
21	return false;
22}
23
24static inline void disable_sacf_uaccess(bool previous)
25{
26	unsigned long flags;
27
28	if (previous)
29		return;
30	local_irq_save(flags);
31	local_ctl_load(1, &get_lowcore()->user_asce);
32	clear_thread_flag(TIF_ASCE_PRIMARY);
33	local_irq_restore(flags);
34}
35
36#endif /* _ASM_S390_ASCE_H */