include/asm-cris/arch-v32/irq.h

   1 #ifndef _ASM_ARCH_IRQ_H
   2 #define _ASM_ARCH_IRQ_H
   3
   4 #include <linux/config.h>
   5 #include "hwregs/intr_vect.h"
   6
   7 /* Number of non-cpu interrupts. */
   8 #define NR_IRQS 0x50 /* Exceptions + IRQs */
   9 #define NR_REAL_IRQS 0x20 /* IRQs */
  10 #define FIRST_IRQ 0x31 /* Exception number for first IRQ */
  11
  12 #ifndef __ASSEMBLY__
  13 /* Global IRQ vector. */
  14 typedef void (*irqvectptr)(void);
  15
  16 struct etrax_interrupt_vector {
  17         irqvectptr v[256];
  18 };
  19
  20 extern struct etrax_interrupt_vector *etrax_irv;        /* head.S */
  21
  22 void mask_irq(int irq);
  23 void unmask_irq(int irq);
  24
  25 void set_exception_vector(int n, irqvectptr addr);
  26
  27 /* Save registers so that they match pt_regs. */
  28 #define SAVE_ALL \
  29         "subq 12,$sp\n\t"       \
  30         "move $erp,[$sp]\n\t"   \
  31         "subq 4,$sp\n\t"        \
  32         "move $srp,[$sp]\n\t"   \
  33         "subq 4,$sp\n\t"        \
  34         "move $ccs,[$sp]\n\t"   \
  35         "subq 4,$sp\n\t"        \
  36         "move $spc,[$sp]\n\t"   \
  37         "subq 4,$sp\n\t"        \
  38         "move $mof,[$sp]\n\t"   \
  39         "subq 4,$sp\n\t"        \
  40         "move $srs,[$sp]\n\t"   \
  41         "subq 4,$sp\n\t"        \
  42         "move.d $acr,[$sp]\n\t" \
  43         "subq 14*4,$sp\n\t"     \
  44         "movem $r13,[$sp]\n\t"  \
  45         "subq 4,$sp\n\t"        \
  46         "move.d $r10,[$sp]\n"
  47
  48 #define STR2(x) #x
  49 #define STR(x) STR2(x)
  50
  51 #define IRQ_NAME2(nr) nr##_interrupt(void)
  52 #define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
  53
  54 /*
  55  * The reason for setting the S-bit when debugging the kernel is that we want
  56  * hardware breakpoints to remain active while we are in an exception handler.
  57  * Note that we cannot simply copy S1, since we may come here from user-space,
  58  * or any context where the S-bit wasn't set.
  59  */
  60 #ifdef CONFIG_ETRAX_KGDB
  61 #define KGDB_FIXUP \
  62         "move $ccs, $r10\n\t"           \
  63         "or.d (1<<9), $r10\n\t"         \
  64         "move $r10, $ccs\n\t"
  65 #else
  66 #define KGDB_FIXUP ""
  67 #endif
  68
  69 /*
  70  * Make sure the causing IRQ is blocked, then call do_IRQ. After that, unblock
  71  * and jump to ret_from_intr which is found in entry.S.
  72  *
  73  * The reason for blocking the IRQ is to allow an sti() before the handler,
  74  * which will acknowledge the interrupt, is run. The actual blocking is made
  75  * by crisv32_do_IRQ.
  76  */
  77 #define BUILD_IRQ(nr, mask)             \
  78 void IRQ_NAME(nr);                      \
  79 __asm__ (                               \
  80         ".text\n\t"                     \
  81         "IRQ" #nr "_interrupt:\n\t"     \
  82         SAVE_ALL                        \
  83         KGDB_FIXUP                      \
  84         "move.d "#nr",$r10\n\t"         \
  85         "move.d $sp,$r12\n\t"           \
  86         "jsr crisv32_do_IRQ\n\t"        \
  87         "moveq 1, $r11\n\t"             \
  88         "jump ret_from_intr\n\t"        \
  89         "nop\n\t");
  90 /*
  91  * This is subtle. The timer interrupt is crucial and it should not be disabled
  92  * for too long. However, if it had been a normal interrupt as per BUILD_IRQ, it
  93  * would have been BLOCK'ed, and then softirq's are run before we return here to
  94  * UNBLOCK. If the softirq's take too much time to run, the timer irq won't run
  95  * and the watchdog will kill us.
  96  *
  97  * Furthermore, if a lot of other irq's occur before we return here, the
  98  * multiple_irq handler is run and it prioritizes the timer interrupt. However
  99  * if we had BLOCK'edit here, we would not get the multiple_irq at all.
 100  *
 101  * The non-blocking here is based on the knowledge that the timer interrupt is
 102  * registred as a fast interrupt (SA_INTERRUPT) so that we _know_ there will not
 103  * be an sti() before the timer irq handler is run to acknowledge the interrupt.
 104  */
 105 #define BUILD_TIMER_IRQ(nr, mask)       \
 106 void IRQ_NAME(nr);                      \
 107 __asm__ (                               \
 108         ".text\n\t"                     \
 109         "IRQ" #nr "_interrupt:\n\t"     \
 110         SAVE_ALL                        \
 111         KGDB_FIXUP                      \
 112         "move.d "#nr",$r10\n\t"         \
 113         "move.d $sp,$r12\n\t"           \
 114         "jsr crisv32_do_IRQ\n\t"        \
 115         "moveq 0,$r11\n\t"              \
 116         "jump ret_from_intr\n\t"        \
 117         "nop\n\t");
 118
 119 #endif /* __ASSEMBLY__ */
 120 #endif /* _ASM_ARCH_IRQ_H */