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,PACASOFTIRQEN(r13);        \
  51         lbz     __rB,PACAIRQHAPPENED(r13);      \
  52         cmpwi   cr0,__rA,0;                     \
  53         li      __rA,0;                         \
  54         ori     __rB,__rB,PACA_IRQ_HARD_DIS;    \
  55         stb     __rB,PACAIRQHAPPENED(r13);      \
  56         beq     44f;                            \
  57         stb     __rA,PACASOFTIRQEN(r13);        \
  58         TRACE_DISABLE_INTS;                     \
  59 44:
  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,0;                         \
  68         ori     __rA,__rA,PACA_IRQ_HARD_DIS;    \
  69         stb     __rB,PACASOFTIRQEN(r13);        \
  70         stb     __rA,PACAIRQHAPPENED(r13)
  71 #endif
  72 #endif
  73
  74 #endif