LXR linux/arch/powerpc/include/asm/irqflags.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * IRQ flags handling
   4 */
   5#ifndef _ASM_IRQFLAGS_H
   6#define _ASM_IRQFLAGS_H
   7
   8#ifndef __ASSEMBLY__
   9/*
  10 * Get definitions for arch_local_save_flags(x), etc.
  11 */
  12#include <asm/hw_irq.h>
  13
  14#else
  15#ifdef CONFIG_TRACE_IRQFLAGS
  16#ifdef CONFIG_IRQSOFF_TRACER
  17/*
  18 * Since the ftrace irqsoff latency trace checks CALLER_ADDR1,
  19 * which is the stack frame here, we need to force a stack frame
  20 * in case we came from user space.
  21 */
  22#define TRACE_WITH_FRAME_BUFFER(func)           \
  23        mflr    r0;                             \
  24        stdu    r1, -STACK_FRAME_OVERHEAD(r1);  \
  25        std     r0, 16(r1);                     \
  26        stdu    r1, -STACK_FRAME_OVERHEAD(r1);  \
  27        bl func;                                \
  28        ld      r1, 0(r1);                      \
  29        ld      r1, 0(r1);
  30#else
  31#define TRACE_WITH_FRAME_BUFFER(func)           \
  32        bl func;
  33#endif
  34
  35/*
  36 * These are calls to C code, so the caller must be prepared for volatiles to
  37 * be clobbered.
  38 */
  39#define TRACE_ENABLE_INTS       TRACE_WITH_FRAME_BUFFER(trace_hardirqs_on)
  40#define TRACE_DISABLE_INTS      TRACE_WITH_FRAME_BUFFER(trace_hardirqs_off)
  41
  42/*
  43 * This is used by assembly code to soft-disable interrupts first and
  44 * reconcile irq state.
  45 *
  46 * NB: This may call C code, so the caller must be prepared for volatiles to
  47 * be clobbered.
  48 */
  49#define RECONCILE_IRQ_STATE(__rA, __rB)         \
  50        lbz     __rA,PACAIRQSOFTMASK(r13);      \
  51        lbz     __rB,PACAIRQHAPPENED(r13);      \
  52        andi.   __rA,__rA,IRQS_DISABLED;        \
  53        li      __rA,IRQS_DISABLED;             \
  54        ori     __rB,__rB,PACA_IRQ_HARD_DIS;    \
  55        stb     __rB,PACAIRQHAPPENED(r13);      \
  56        bne     44f;                            \
  57        stb     __rA,PACAIRQSOFTMASK(r13);      \
  58        TRACE_DISABLE_INTS;                     \
  5944:
  60
  61#else
  62#define TRACE_ENABLE_INTS
  63#define TRACE_DISABLE_INTS
  64
  65#define RECONCILE_IRQ_STATE(__rA, __rB)         \
  66        lbz     __rA,PACAIRQHAPPENED(r13);      \
  67        li      __rB,IRQS_DISABLED;             \
  68        ori     __rA,__rA,PACA_IRQ_HARD_DIS;    \
  69        stb     __rB,PACAIRQSOFTMASK(r13);      \
  70        stb     __rA,PACAIRQHAPPENED(r13)
  71#endif
  72#endif
  73
  74#endif
  75