Release 4.14 arch/powerpc/include/asm/irqflags.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * IRQ flags handling
 */
#ifndef _ASM_IRQFLAGS_H

#define _ASM_IRQFLAGS_H

#ifndef __ASSEMBLY__
/*
 * Get definitions for arch_local_save_flags(x), etc.
 */
#include <asm/hw_irq.h>

#else
#ifdef CONFIG_TRACE_IRQFLAGS
#ifdef CONFIG_IRQSOFF_TRACER
/*
 * Since the ftrace irqsoff latency trace checks CALLER_ADDR1,
 * which is the stack frame here, we need to force a stack frame
 * in case we came from user space.
 */

#define TRACE_WITH_FRAME_BUFFER(func)		\
	mflr    r0;                             \
        stdu    r1, -STACK_FRAME_OVERHEAD(r1);  \
        std     r0, 16(r1);                     \
        stdu    r1, -STACK_FRAME_OVERHEAD(r1);  \
        bl func;                                \
        ld      r1, 0(r1);                      \
        ld      r1, 0(r1);
#else

#define TRACE_WITH_FRAME_BUFFER(func)		\
	bl func;
#endif

/*
 * These are calls to C code, so the caller must be prepared for volatiles to
 * be clobbered.
 */

#define TRACE_ENABLE_INTS	TRACE_WITH_FRAME_BUFFER(trace_hardirqs_on)

#define TRACE_DISABLE_INTS	TRACE_WITH_FRAME_BUFFER(trace_hardirqs_off)

/*
 * This is used by assembly code to soft-disable interrupts first and
 * reconcile irq state.
 *
 * NB: This may call C code, so the caller must be prepared for volatiles to
 * be clobbered.
 */

#define RECONCILE_IRQ_STATE(__rA, __rB)		\
	lbz     __rA,PACASOFTIRQEN(r13);        \
        lbz     __rB,PACAIRQHAPPENED(r13);      \
        cmpwi   cr0,__rA,0;                     \
        li      __rA,0;                         \
        ori     __rB,__rB,PACA_IRQ_HARD_DIS;    \
        stb     __rB,PACAIRQHAPPENED(r13);      \
        beq     44f;                            \
        stb     __rA,PACASOFTIRQEN(r13);        \
        TRACE_DISABLE_INTS;                     \
44:

#else

#define TRACE_ENABLE_INTS

#define TRACE_DISABLE_INTS


#define RECONCILE_IRQ_STATE(__rA, __rB)		\
	lbz     __rA,PACAIRQHAPPENED(r13);      \
        li      __rB,0;                         \
        ori     __rA,__rA,PACA_IRQ_HARD_DIS;    \
        stb     __rB,PACASOFTIRQEN(r13);        \
        stb     __rA,PACAIRQHAPPENED(r13)
#endif
#endif

#endif
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Ingo Molnar
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Directory: arch/powerpc/include/asm

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