irqflags.h

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/*
 * 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, -32(r1);            \
    std r0, 16(r1);         \
    stdu    r1, -32(r1);            \
    bl func;                \
    ld  r1, 0(r1);          \
    ld  r1, 0(r1);
#else
#define TRACE_WITH_FRAME_BUFFER(func)       \
    bl func;
#endif

/*
 * Most of the CPU's IRQ-state tracing is done from assembly code; we
 * have to call a C function so call a wrapper that saves all the
 * C-clobbered registers.
 */
#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
 */
#define SOFT_DISABLE_INTS(__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 SOFT_DISABLE_INTS(__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