Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1 | #ifndef _ASM_ARCH_IRQ_H |
| 2 | #define _ASM_ARCH_IRQ_H |
| 3 | |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 4 | #include "hwregs/intr_vect.h" |
| 5 | |
| 6 | /* Number of non-cpu interrupts. */ |
| 7 | #define NR_IRQS 0x50 /* Exceptions + IRQs */ |
| 8 | #define NR_REAL_IRQS 0x20 /* IRQs */ |
| 9 | #define FIRST_IRQ 0x31 /* Exception number for first IRQ */ |
| 10 | |
| 11 | #ifndef __ASSEMBLY__ |
| 12 | /* Global IRQ vector. */ |
| 13 | typedef void (*irqvectptr)(void); |
| 14 | |
| 15 | struct etrax_interrupt_vector { |
| 16 | irqvectptr v[256]; |
| 17 | }; |
| 18 | |
| 19 | extern struct etrax_interrupt_vector *etrax_irv; /* head.S */ |
| 20 | |
| 21 | void mask_irq(int irq); |
| 22 | void unmask_irq(int irq); |
| 23 | |
| 24 | void set_exception_vector(int n, irqvectptr addr); |
| 25 | |
| 26 | /* Save registers so that they match pt_regs. */ |
| 27 | #define SAVE_ALL \ |
| 28 | "subq 12,$sp\n\t" \ |
| 29 | "move $erp,[$sp]\n\t" \ |
| 30 | "subq 4,$sp\n\t" \ |
| 31 | "move $srp,[$sp]\n\t" \ |
| 32 | "subq 4,$sp\n\t" \ |
| 33 | "move $ccs,[$sp]\n\t" \ |
| 34 | "subq 4,$sp\n\t" \ |
| 35 | "move $spc,[$sp]\n\t" \ |
| 36 | "subq 4,$sp\n\t" \ |
| 37 | "move $mof,[$sp]\n\t" \ |
| 38 | "subq 4,$sp\n\t" \ |
| 39 | "move $srs,[$sp]\n\t" \ |
| 40 | "subq 4,$sp\n\t" \ |
| 41 | "move.d $acr,[$sp]\n\t" \ |
| 42 | "subq 14*4,$sp\n\t" \ |
| 43 | "movem $r13,[$sp]\n\t" \ |
| 44 | "subq 4,$sp\n\t" \ |
| 45 | "move.d $r10,[$sp]\n" |
| 46 | |
| 47 | #define STR2(x) #x |
| 48 | #define STR(x) STR2(x) |
| 49 | |
| 50 | #define IRQ_NAME2(nr) nr##_interrupt(void) |
| 51 | #define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr) |
| 52 | |
| 53 | /* |
| 54 | * The reason for setting the S-bit when debugging the kernel is that we want |
| 55 | * hardware breakpoints to remain active while we are in an exception handler. |
| 56 | * Note that we cannot simply copy S1, since we may come here from user-space, |
| 57 | * or any context where the S-bit wasn't set. |
| 58 | */ |
| 59 | #ifdef CONFIG_ETRAX_KGDB |
| 60 | #define KGDB_FIXUP \ |
| 61 | "move $ccs, $r10\n\t" \ |
| 62 | "or.d (1<<9), $r10\n\t" \ |
| 63 | "move $r10, $ccs\n\t" |
| 64 | #else |
| 65 | #define KGDB_FIXUP "" |
| 66 | #endif |
| 67 | |
| 68 | /* |
| 69 | * Make sure the causing IRQ is blocked, then call do_IRQ. After that, unblock |
| 70 | * and jump to ret_from_intr which is found in entry.S. |
| 71 | * |
| 72 | * The reason for blocking the IRQ is to allow an sti() before the handler, |
| 73 | * which will acknowledge the interrupt, is run. The actual blocking is made |
| 74 | * by crisv32_do_IRQ. |
| 75 | */ |
| 76 | #define BUILD_IRQ(nr, mask) \ |
| 77 | void IRQ_NAME(nr); \ |
| 78 | __asm__ ( \ |
| 79 | ".text\n\t" \ |
| 80 | "IRQ" #nr "_interrupt:\n\t" \ |
| 81 | SAVE_ALL \ |
| 82 | KGDB_FIXUP \ |
| 83 | "move.d "#nr",$r10\n\t" \ |
| 84 | "move.d $sp,$r12\n\t" \ |
| 85 | "jsr crisv32_do_IRQ\n\t" \ |
| 86 | "moveq 1, $r11\n\t" \ |
| 87 | "jump ret_from_intr\n\t" \ |
| 88 | "nop\n\t"); |
| 89 | /* |
| 90 | * This is subtle. The timer interrupt is crucial and it should not be disabled |
| 91 | * for too long. However, if it had been a normal interrupt as per BUILD_IRQ, it |
| 92 | * would have been BLOCK'ed, and then softirq's are run before we return here to |
| 93 | * UNBLOCK. If the softirq's take too much time to run, the timer irq won't run |
| 94 | * and the watchdog will kill us. |
| 95 | * |
| 96 | * Furthermore, if a lot of other irq's occur before we return here, the |
| 97 | * multiple_irq handler is run and it prioritizes the timer interrupt. However |
| 98 | * if we had BLOCK'edit here, we would not get the multiple_irq at all. |
| 99 | * |
| 100 | * The non-blocking here is based on the knowledge that the timer interrupt is |
Thomas Gleixner | aa7135f | 2006-07-01 19:29:14 -0700 | [diff] [blame] | 101 | * registred as a fast interrupt (IRQF_DISABLED) so that we _know_ there will not |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 102 | * be an sti() before the timer irq handler is run to acknowledge the interrupt. |
| 103 | */ |
| 104 | #define BUILD_TIMER_IRQ(nr, mask) \ |
| 105 | void IRQ_NAME(nr); \ |
| 106 | __asm__ ( \ |
| 107 | ".text\n\t" \ |
| 108 | "IRQ" #nr "_interrupt:\n\t" \ |
| 109 | SAVE_ALL \ |
| 110 | KGDB_FIXUP \ |
| 111 | "move.d "#nr",$r10\n\t" \ |
| 112 | "move.d $sp,$r12\n\t" \ |
| 113 | "jsr crisv32_do_IRQ\n\t" \ |
| 114 | "moveq 0,$r11\n\t" \ |
| 115 | "jump ret_from_intr\n\t" \ |
| 116 | "nop\n\t"); |
| 117 | |
| 118 | #endif /* __ASSEMBLY__ */ |
| 119 | #endif /* _ASM_ARCH_IRQ_H */ |