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  * Most of the CPU's IRQ-state tracing is done from assembly code; we
  36  * have to call a C function so call a wrapper that saves all the
  37  * C-clobbered registers.
  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 #define RECONCILE_IRQ_STATE(__rA, __rB)         \
  47         lbz     __rA,PACASOFTIRQEN(r13);        \
  48         lbz     __rB,PACAIRQHAPPENED(r13);      \
  49         cmpwi   cr0,__rA,0;                     \
  50         li      __rA,0;                         \
  51         ori     __rB,__rB,PACA_IRQ_HARD_DIS;    \
  52         stb     __rB,PACAIRQHAPPENED(r13);      \
  53         beq     44f;                            \
  54         stb     __rA,PACASOFTIRQEN(r13);        \
  55         TRACE_DISABLE_INTS;                     \
  56 44:
  57
  58 #else
  59 #define TRACE_ENABLE_INTS
  60 #define TRACE_DISABLE_INTS
  61
  62 #define RECONCILE_IRQ_STATE(__rA, __rB)         \
  63         lbz     __rA,PACAIRQHAPPENED(r13);      \
  64         li      __rB,0;                         \
  65         ori     __rA,__rA,PACA_IRQ_HARD_DIS;    \
  66         stb     __rB,PACASOFTIRQEN(r13);        \
  67         stb     __rA,PACAIRQHAPPENED(r13)
  68 #endif
  69 #endif
  70
  71 #endif