1 #ifndef _ASM_ARCH_IRQ_H 2 #define _ASM_ARCH_IRQ_H 3 4 #include <hwregs/intr_vect.h> 5 6 /* Number of non-cpu interrupts. */ 7 #define NR_IRQS NBR_INTR_VECT /* Exceptions + IRQs */ 8 #define FIRST_IRQ 0x31 /* Exception number for first IRQ */ 9 #define NR_REAL_IRQS (NBR_INTR_VECT - FIRST_IRQ) /* IRQs */ 10 #if NR_REAL_IRQS > 32 11 #define MACH_IRQS 64 12 #else 13 #define MACH_IRQS 32 14 #endif 15 16 #ifndef __ASSEMBLY__ 17 /* Global IRQ vector. */ 18 typedef void (*irqvectptr)(void); 19 20 struct etrax_interrupt_vector { 21 irqvectptr v[256]; 22 }; 23 24 extern struct etrax_interrupt_vector *etrax_irv; /* head.S */ 25 26 void crisv32_mask_irq(int irq); 27 void crisv32_unmask_irq(int irq); 28 29 void set_exception_vector(int n, irqvectptr addr); 30 31 /* Save registers so that they match pt_regs. */ 32 #define SAVE_ALL \ 33 "subq 12,$sp\n\t" \ 34 "move $erp,[$sp]\n\t" \ 35 "subq 4,$sp\n\t" \ 36 "move $srp,[$sp]\n\t" \ 37 "subq 4,$sp\n\t" \ 38 "move $ccs,[$sp]\n\t" \ 39 "subq 4,$sp\n\t" \ 40 "move $spc,[$sp]\n\t" \ 41 "subq 4,$sp\n\t" \ 42 "move $mof,[$sp]\n\t" \ 43 "subq 4,$sp\n\t" \ 44 "move $srs,[$sp]\n\t" \ 45 "subq 4,$sp\n\t" \ 46 "move.d $acr,[$sp]\n\t" \ 47 "subq 14*4,$sp\n\t" \ 48 "movem $r13,[$sp]\n\t" \ 49 "subq 4,$sp\n\t" \ 50 "move.d $r10,[$sp]\n" 51 52 #define STR2(x) #x 53 #define STR(x) STR2(x) 54 55 #define IRQ_NAME2(nr) nr##_interrupt(void) 56 #define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr) 57 58 /* 59 * The reason for setting the S-bit when debugging the kernel is that we want 60 * hardware breakpoints to remain active while we are in an exception handler. 61 * Note that we cannot simply copy S1, since we may come here from user-space, 62 * or any context where the S-bit wasn't set. 63 */ 64 #ifdef CONFIG_ETRAX_KGDB 65 #define KGDB_FIXUP \ 66 "move $ccs, $r10\n\t" \ 67 "or.d (1<<9), $r10\n\t" \ 68 "move $r10, $ccs\n\t" 69 #else 70 #define KGDB_FIXUP "" 71 #endif 72 73 /* 74 * Make sure the causing IRQ is blocked, then call do_IRQ. After that, unblock 75 * and jump to ret_from_intr which is found in entry.S. 76 * 77 * The reason for blocking the IRQ is to allow an sti() before the handler, 78 * which will acknowledge the interrupt, is run. The actual blocking is made 79 * by crisv32_do_IRQ. 80 */ 81 #define BUILD_IRQ(nr) \ 82 void IRQ_NAME(nr); \ 83 __asm__ ( \ 84 ".text\n\t" \ 85 "IRQ" #nr "_interrupt:\n\t" \ 86 SAVE_ALL \ 87 KGDB_FIXUP \ 88 "move.d "#nr",$r10\n\t" \ 89 "move.d $sp, $r12\n\t" \ 90 "jsr crisv32_do_IRQ\n\t" \ 91 "moveq 1, $r11\n\t" \ 92 "jump ret_from_intr\n\t" \ 93 "nop\n\t"); 94 /* 95 * This is subtle. The timer interrupt is crucial and it should not be disabled 96 * for too long. However, if it had been a normal interrupt as per BUILD_IRQ, it 97 * would have been BLOCK'ed, and then softirq's are run before we return here to 98 * UNBLOCK. If the softirq's take too much time to run, the timer irq won't run 99 * and the watchdog will kill us. 100 * 101 * Furthermore, if a lot of other irq's occur before we return here, the 102 * multiple_irq handler is run and it prioritizes the timer interrupt. However 103 * if we had BLOCK'edit here, we would not get the multiple_irq at all. 104 * 105 * The non-blocking here is based on the knowledge that the timer interrupt is 106 * registred as a fast interrupt (IRQF_DISABLED) so that we _know_ there will not 107 * be an sti() before the timer irq handler is run to acknowledge the interrupt. 108 */ 109 #define BUILD_TIMER_IRQ(nr, mask) \ 110 void IRQ_NAME(nr); \ 111 __asm__ ( \ 112 ".text\n\t" \ 113 "IRQ" #nr "_interrupt:\n\t" \ 114 SAVE_ALL \ 115 KGDB_FIXUP \ 116 "move.d "#nr",$r10\n\t" \ 117 "move.d $sp,$r12\n\t" \ 118 "jsr crisv32_do_IRQ\n\t" \ 119 "moveq 0,$r11\n\t" \ 120 "jump ret_from_intr\n\t" \ 121 "nop\n\t"); 122 123 #endif /* __ASSEMBLY__ */ 124 #endif /* _ASM_ARCH_IRQ_H */ 125