[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 __ASSEMBLER__

#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

#ifndef CONFIG_PARAVIRT
#ifndef __ASSEMBLY__
/*
 * 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();
}
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_PARAVIRT */

#ifdef CONFIG_PARAVIRT_XXL
#include <asm/paravirt.h>
#else
#ifndef __ASSEMBLER__
#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();
}

/*
 * 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 /* __ASSEMBLER__ */
#endif /* CONFIG_PARAVIRT_XXL */

#ifndef __ASSEMBLER__
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 /* !__ASSEMBLER__ */

#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 __ASSEMBLER__
	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	#ifndef CONFIG_PARAVIRT
	80	#ifndef __ASSEMBLY__
	81	/*
	82	* Used in the idle loop; sti takes one instruction cycle
	83	* to complete:
	84	*/
	85	static __always_inline void arch_safe_halt(void)
	86	{
	87	native_safe_halt();
	88	}
	89
	90	/*
	91	* Used when interrupts are already enabled or to
	92	* shutdown the processor:
	93	*/
	94	static __always_inline void halt(void)
	95	{
	96	native_halt();
	97	}
	98	#endif /* __ASSEMBLY__ */
	99	#endif /* CONFIG_PARAVIRT */
	100
	101	#ifdef CONFIG_PARAVIRT_XXL
	102	#include <asm/paravirt.h>
	103	#else
	104	#ifndef __ASSEMBLER__
	105	#include <linux/types.h>
	106
	107	static __always_inline unsigned long arch_local_save_flags(void)
	108	{
	109	return native_save_fl();
	110	}
	111
	112	static __always_inline void arch_local_irq_disable(void)
	113	{
	114	native_irq_disable();
	115	}
	116
	117	static __always_inline void arch_local_irq_enable(void)
	118	{
	119	native_irq_enable();
	120	}
	121
	122	/*
	123	* For spinlocks, etc:
	124	*/
	125	static __always_inline unsigned long arch_local_irq_save(void)
	126	{
	127	unsigned long flags = arch_local_save_flags();
	128	arch_local_irq_disable();
	129	return flags;
	130	}
	131	#else
	132
	133	#ifdef CONFIG_X86_64
	134	#ifdef CONFIG_DEBUG_ENTRY
	135	#define SAVE_FLAGS pushfq; popq %rax
	136	#endif
	137
	138	#endif
	139
	140	#endif /* __ASSEMBLER__ */
	141	#endif /* CONFIG_PARAVIRT_XXL */
	142
	143	#ifndef __ASSEMBLER__
	144	static __always_inline int arch_irqs_disabled_flags(unsigned long flags)
	145	{
	146	return !(flags & X86_EFLAGS_IF);
	147	}
	148
	149	static __always_inline int arch_irqs_disabled(void)
	150	{
	151	unsigned long flags = arch_local_save_flags();
	152
	153	return arch_irqs_disabled_flags(flags);
	154	}
	155
	156	static __always_inline void arch_local_irq_restore(unsigned long flags)
	157	{
	158	if (!arch_irqs_disabled_flags(flags))
	159	arch_local_irq_enable();
	160	}
	161	#endif /* !__ASSEMBLER__ */
	162
	163	#endif