kernel/arch/powerpc/include/asm/irqflags.h

   1 /*
   2  * IRQ flags handling
   3  */
   4 #ifndef _ASM_IRQFLAGS_H
   5 #define _ASM_IRQFLAGS_H
   6
   7 #ifndef __ASSEMBLY__
   8 /*
   9  * Get definitions for arch_local_save_flags(x), etc.
  10  */
  11 #include <asm/hw_irq.h>
  12
  13 #else
  14 #ifdef CONFIG_TRACE_IRQFLAGS
  15 #ifdef CONFIG_IRQSOFF_TRACER
  16 /*
  17  * Since the ftrace irqsoff latency trace checks CALLER_ADDR1,
  18  * which is the stack frame here, we need to force a stack frame
  19  * in case we came from user space.
  20  */
  21 #define TRACE_WITH_FRAME_BUFFER(func)           \
  22         mflr    r0;                             \
  23         stdu    r1, -STACK_FRAME_OVERHEAD(r1);  \
  24         std     r0, 16(r1);                     \
  25         stdu    r1, -STACK_FRAME_OVERHEAD(r1);  \
  26         bl func;                                \
  27         ld      r1, 0(r1);                      \
  28         ld      r1, 0(r1);
  29 #else
  30 #define TRACE_WITH_FRAME_BUFFER(func)           \
  31         bl func;
  32 #endif
  33
  34 /*
  35  * These are calls to C code, so the caller must be prepared for volatiles to
  36  * be clobbered.
  37  */
  38 #define TRACE_ENABLE_INTS       TRACE_WITH_FRAME_BUFFER(trace_hardirqs_on)
  39 #define TRACE_DISABLE_INTS      TRACE_WITH_FRAME_BUFFER(trace_hardirqs_off)
  40
  41 /*
  42  * This is used by assembly code to soft-disable interrupts first and
  43  * reconcile irq state.
  44  *
  45  * NB: This may call C code, so the caller must be prepared for volatiles to
  46  * be clobbered.
  47  */
  48 #define RECONCILE_IRQ_STATE(__rA, __rB)         \
  49         lbz     __rA,PACASOFTIRQEN(r13);        \
  50         lbz     __rB,PACAIRQHAPPENED(r13);      \
  51         cmpwi   cr0,__rA,0;                     \
  52         li      __rA,0;                         \
  53         ori     __rB,__rB,PACA_IRQ_HARD_DIS;    \
  54         stb     __rB,PACAIRQHAPPENED(r13);      \
  55         beq     44f;                            \
  56         stb     __rA,PACASOFTIRQEN(r13);        \
  57         TRACE_DISABLE_INTS;                     \
  58 44:
  59
  60 #else
  61 #define TRACE_ENABLE_INTS
  62 #define TRACE_DISABLE_INTS
  63
  64 #define RECONCILE_IRQ_STATE(__rA, __rB)         \
  65         lbz     __rA,PACAIRQHAPPENED(r13);      \
  66         li      __rB,0;                         \
  67         ori     __rA,__rA,PACA_IRQ_HARD_DIS;    \
  68         stb     __rB,PACASOFTIRQEN(r13);        \
  69         stb     __rA,PACAIRQHAPPENED(r13)
  70 #endif
  71 #endif
  72
  73 #endif