arch/s390/include/asm/entry-common.h

Source file repositories/reference/linux-study-clean/arch/s390/include/asm/entry-common.h

File Facts

System
Linux kernel
Corpus path
arch/s390/include/asm/entry-common.h
Extension
.h
Size
1409 bytes
Lines
65
Domain
Architecture Layer
Bucket
arch/s390
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef ARCH_S390_ENTRY_COMMON_H
#define ARCH_S390_ENTRY_COMMON_H

#include <linux/sched.h>
#include <linux/audit.h>
#include <linux/randomize_kstack.h>
#include <linux/processor.h>
#include <linux/uaccess.h>
#include <asm/timex.h>
#include <asm/fpu.h>
#include <asm/pai.h>

#define ARCH_EXIT_TO_USER_MODE_WORK (_TIF_GUARDED_STORAGE | _TIF_PER_TRAP)

void do_per_trap(struct pt_regs *regs);

static __always_inline void arch_enter_from_user_mode(struct pt_regs *regs)
{
	if (IS_ENABLED(CONFIG_DEBUG_ENTRY))
		debug_user_asce(0);

	pai_kernel_enter(regs);
}

#define arch_enter_from_user_mode arch_enter_from_user_mode

static __always_inline void arch_exit_to_user_mode_work(struct pt_regs *regs,
							unsigned long ti_work)
{
	if (ti_work & _TIF_PER_TRAP) {
		clear_thread_flag(TIF_PER_TRAP);
		do_per_trap(regs);
	}

	if (ti_work & _TIF_GUARDED_STORAGE)
		gs_load_bc_cb(regs);
}

#define arch_exit_to_user_mode_work arch_exit_to_user_mode_work

static __always_inline void arch_exit_to_user_mode(void)
{
	load_user_fpu_regs();

	if (IS_ENABLED(CONFIG_DEBUG_ENTRY))
		debug_user_asce(1);

	pai_kernel_exit(current_pt_regs());
}

#define arch_exit_to_user_mode arch_exit_to_user_mode

static __always_inline bool arch_in_rcu_eqs(void)
{
	if (IS_ENABLED(CONFIG_KVM))
		return current->flags & PF_VCPU;

	return false;
}

#define arch_in_rcu_eqs arch_in_rcu_eqs

#endif

Annotation

Implementation Notes