[linux-2.6-block.git] / arch / x86 / include / asm / irqflags.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _X86_IRQFLAGS_H_
#define _X86_IRQFLAGS_H_

#include <asm/processor-flags.h>

#ifndef __ASSEMBLY__

#include <asm/nospec-branch.h>

/*
 * Interrupt control:
 */

/* Declaration required for gcc < 4.9 to prevent -Werror=missing-prototypes */
extern inline unsigned long native_save_fl(void);
extern __always_inline unsigned long native_save_fl(void)
{
	unsigned long flags;

	/*
	 * "=rm" is safe here, because "pop" adjusts the stack before
	 * it evaluates its effective address -- this is part of the
	 * documented behavior of the "pop" instruction.
	 */
	asm volatile("# __raw_save_flags\n\t"
		     "pushf ; pop %0"
		     : "=rm" (flags)
		     : /* no input */
		     : "memory");

	return flags;
}

static __always_inline void native_irq_disable(void)
{
	asm volatile("cli": : :"memory");
}

static __always_inline void native_irq_enable(void)
{
	asm volatile("sti": : :"memory");
}

static __always_inline void native_safe_halt(void)
{
	mds_idle_clear_cpu_buffers();
	asm volatile("sti; hlt": : :"memory");
}

static __always_inline void native_halt(void)
{
	mds_idle_clear_cpu_buffers();
	asm volatile("hlt": : :"memory");
}

static __always_inline int native_irqs_disabled_flags(unsigned long flags)
{
	return !(flags & X86_EFLAGS_IF);
}

static __always_inline unsigned long native_local_irq_save(void)
{
	unsigned long flags = native_save_fl();

	native_irq_disable();

	return flags;
}

static __always_inline void native_local_irq_restore(unsigned long flags)
{
	if (!native_irqs_disabled_flags(flags))
		native_irq_enable();
}

#endif

#ifdef CONFIG_PARAVIRT_XXL
#include <asm/paravirt.h>
#else
#ifndef __ASSEMBLY__
#include <linux/types.h>

static __always_inline unsigned long arch_local_save_flags(void)
{
	return native_save_fl();
}

static __always_inline void arch_local_irq_disable(void)
{
	native_irq_disable();
}

static __always_inline void arch_local_irq_enable(void)
{
	native_irq_enable();
}

/*
 * Used in the idle loop; sti takes one instruction cycle
 * to complete:
 */
static __always_inline void arch_safe_halt(void)
{
	native_safe_halt();
}

/*
 * Used when interrupts are already enabled or to
 * shutdown the processor:
 */
static __always_inline void halt(void)
{
	native_halt();
}

/*
 * For spinlocks, etc:
 */
static __always_inline unsigned long arch_local_irq_save(void)
{
	unsigned long flags = arch_local_save_flags();
	arch_local_irq_disable();
	return flags;
}
#else

#ifdef CONFIG_X86_64
#ifdef CONFIG_DEBUG_ENTRY
#define SAVE_FLAGS		pushfq; popq %rax
#endif

#endif

#endif /* __ASSEMBLY__ */
#endif /* CONFIG_PARAVIRT_XXL */

#ifndef __ASSEMBLY__
static __always_inline int arch_irqs_disabled_flags(unsigned long flags)
{
	return !(flags & X86_EFLAGS_IF);
}

static __always_inline int arch_irqs_disabled(void)
{
	unsigned long flags = arch_local_save_flags();

	return arch_irqs_disabled_flags(flags);
}

static __always_inline void arch_local_irq_restore(unsigned long flags)
{
	if (!arch_irqs_disabled_flags(flags))
		arch_local_irq_enable();
}
#endif /* !__ASSEMBLY__ */

#endif
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifndef _X86_IRQFLAGS_H_
	3	#define _X86_IRQFLAGS_H_
	4
	5	#include <asm/processor-flags.h>
	6
	7	#ifndef __ASSEMBLY__
	8
	9	#include <asm/nospec-branch.h>
	10
	11	/*
	12	* Interrupt control:
	13	*/
	14
	15	/* Declaration required for gcc < 4.9 to prevent -Werror=missing-prototypes */
	16	extern inline unsigned long native_save_fl(void);
	17	extern __always_inline unsigned long native_save_fl(void)
	18	{
	19	unsigned long flags;
	20
	21	/*
	22	* "=rm" is safe here, because "pop" adjusts the stack before
	23	* it evaluates its effective address -- this is part of the
	24	* documented behavior of the "pop" instruction.
	25	*/
	26	asm volatile("# __raw_save_flags\n\t"
	27	"pushf ; pop %0"
	28	: "=rm" (flags)
	29	: /* no input */
	30	: "memory");
	31
	32	return flags;
	33	}
	34
	35	static __always_inline void native_irq_disable(void)
	36	{
	37	asm volatile("cli": : :"memory");
	38	}
	39
	40	static __always_inline void native_irq_enable(void)
	41	{
	42	asm volatile("sti": : :"memory");
	43	}
	44
	45	static __always_inline void native_safe_halt(void)
	46	{
	47	mds_idle_clear_cpu_buffers();
	48	asm volatile("sti; hlt": : :"memory");
	49	}
	50
	51	static __always_inline void native_halt(void)
	52	{
	53	mds_idle_clear_cpu_buffers();
	54	asm volatile("hlt": : :"memory");
	55	}
	56
	57	static __always_inline int native_irqs_disabled_flags(unsigned long flags)
	58	{
	59	return !(flags & X86_EFLAGS_IF);
	60	}
	61
	62	static __always_inline unsigned long native_local_irq_save(void)
	63	{
	64	unsigned long flags = native_save_fl();
	65
	66	native_irq_disable();
	67
	68	return flags;
	69	}
	70
	71	static __always_inline void native_local_irq_restore(unsigned long flags)
	72	{
	73	if (!native_irqs_disabled_flags(flags))
	74	native_irq_enable();
	75	}
	76
	77	#endif
	78
	79	#ifdef CONFIG_PARAVIRT_XXL
	80	#include <asm/paravirt.h>
	81	#else
	82	#ifndef __ASSEMBLY__
	83	#include <linux/types.h>
	84
	85	static __always_inline unsigned long arch_local_save_flags(void)
	86	{
	87	return native_save_fl();
	88	}
	89
	90	static __always_inline void arch_local_irq_disable(void)
	91	{
	92	native_irq_disable();
	93	}
	94
	95	static __always_inline void arch_local_irq_enable(void)
	96	{
	97	native_irq_enable();
	98	}
	99
	100	/*
	101	* Used in the idle loop; sti takes one instruction cycle
	102	* to complete:
	103	*/
	104	static __always_inline void arch_safe_halt(void)
	105	{
	106	native_safe_halt();
	107	}
	108
	109	/*
	110	* Used when interrupts are already enabled or to
	111	* shutdown the processor:
	112	*/
	113	static __always_inline void halt(void)
	114	{
	115	native_halt();
	116	}
	117
	118	/*
	119	* For spinlocks, etc:
	120	*/
	121	static __always_inline unsigned long arch_local_irq_save(void)
	122	{
	123	unsigned long flags = arch_local_save_flags();
	124	arch_local_irq_disable();
	125	return flags;
	126	}
	127	#else
	128
	129	#ifdef CONFIG_X86_64
	130	#ifdef CONFIG_DEBUG_ENTRY
	131	#define SAVE_FLAGS pushfq; popq %rax
	132	#endif
	133
	134	#endif
	135
	136	#endif /* __ASSEMBLY__ */
	137	#endif /* CONFIG_PARAVIRT_XXL */
	138
	139	#ifndef __ASSEMBLY__
	140	static __always_inline int arch_irqs_disabled_flags(unsigned long flags)
	141	{
	142	return !(flags & X86_EFLAGS_IF);
	143	}
	144
	145	static __always_inline int arch_irqs_disabled(void)
	146	{
	147	unsigned long flags = arch_local_save_flags();
	148
	149	return arch_irqs_disabled_flags(flags);
	150	}
	151
	152	static __always_inline void arch_local_irq_restore(unsigned long flags)
	153	{
	154	if (!arch_irqs_disabled_flags(flags))
	155	arch_local_irq_enable();
	156	}
	157	#endif /* !__ASSEMBLY__ */
	158
	159	#endif