diff options
Diffstat (limited to 'include/asm-cris/arch-v32/irq.h')
| -rw-r--r-- | include/asm-cris/arch-v32/irq.h | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/include/asm-cris/arch-v32/irq.h b/include/asm-cris/arch-v32/irq.h new file mode 100644 index 0000000..d35aa81 --- /dev/null +++ b/include/asm-cris/arch-v32/irq.h @@ -0,0 +1,120 @@ +#ifndef _ASM_ARCH_IRQ_H +#define _ASM_ARCH_IRQ_H + +#include <linux/config.h> +#include "hwregs/intr_vect.h" + +/* Number of non-cpu interrupts. */ +#define NR_IRQS 0x50 /* Exceptions + IRQs */ +#define NR_REAL_IRQS 0x20 /* IRQs */ +#define FIRST_IRQ 0x31 /* Exception number for first IRQ */ + +#ifndef __ASSEMBLY__ +/* Global IRQ vector. */ +typedef void (*irqvectptr)(void); + +struct etrax_interrupt_vector { + irqvectptr v[256]; +}; + +extern struct etrax_interrupt_vector *etrax_irv; /* head.S */ + +void mask_irq(int irq); +void unmask_irq(int irq); + +void set_exception_vector(int n, irqvectptr addr); + +/* Save registers so that they match pt_regs. */ +#define SAVE_ALL \ + "subq 12,$sp\n\t" \ + "move $erp,[$sp]\n\t" \ + "subq 4,$sp\n\t" \ + "move $srp,[$sp]\n\t" \ + "subq 4,$sp\n\t" \ + "move $ccs,[$sp]\n\t" \ + "subq 4,$sp\n\t" \ + "move $spc,[$sp]\n\t" \ + "subq 4,$sp\n\t" \ + "move $mof,[$sp]\n\t" \ + "subq 4,$sp\n\t" \ + "move $srs,[$sp]\n\t" \ + "subq 4,$sp\n\t" \ + "move.d $acr,[$sp]\n\t" \ + "subq 14*4,$sp\n\t" \ + "movem $r13,[$sp]\n\t" \ + "subq 4,$sp\n\t" \ + "move.d $r10,[$sp]\n" + +#define STR2(x) #x +#define STR(x) STR2(x) + +#define IRQ_NAME2(nr) nr##_interrupt(void) +#define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr) + +/* + * The reason for setting the S-bit when debugging the kernel is that we want + * hardware breakpoints to remain active while we are in an exception handler. + * Note that we cannot simply copy S1, since we may come here from user-space, + * or any context where the S-bit wasn't set. + */ +#ifdef CONFIG_ETRAX_KGDB +#define KGDB_FIXUP \ + "move $ccs, $r10\n\t" \ + "or.d (1<<9), $r10\n\t" \ + "move $r10, $ccs\n\t" +#else +#define KGDB_FIXUP "" +#endif + +/* + * Make sure the causing IRQ is blocked, then call do_IRQ. After that, unblock + * and jump to ret_from_intr which is found in entry.S. + * + * The reason for blocking the IRQ is to allow an sti() before the handler, + * which will acknowledge the interrupt, is run. The actual blocking is made + * by crisv32_do_IRQ. + */ +#define BUILD_IRQ(nr, mask) \ +void IRQ_NAME(nr); \ +__asm__ ( \ + ".text\n\t" \ + "IRQ" #nr "_interrupt:\n\t" \ + SAVE_ALL \ + KGDB_FIXUP \ + "move.d "#nr",$r10\n\t" \ + "move.d $sp,$r12\n\t" \ + "jsr crisv32_do_IRQ\n\t" \ + "moveq 1, $r11\n\t" \ + "jump ret_from_intr\n\t" \ + "nop\n\t"); +/* + * This is subtle. The timer interrupt is crucial and it should not be disabled + * for too long. However, if it had been a normal interrupt as per BUILD_IRQ, it + * would have been BLOCK'ed, and then softirq's are run before we return here to + * UNBLOCK. If the softirq's take too much time to run, the timer irq won't run + * and the watchdog will kill us. + * + * Furthermore, if a lot of other irq's occur before we return here, the + * multiple_irq handler is run and it prioritizes the timer interrupt. However + * if we had BLOCK'edit here, we would not get the multiple_irq at all. + * + * The non-blocking here is based on the knowledge that the timer interrupt is + * registred as a fast interrupt (SA_INTERRUPT) so that we _know_ there will not + * be an sti() before the timer irq handler is run to acknowledge the interrupt. + */ +#define BUILD_TIMER_IRQ(nr, mask) \ +void IRQ_NAME(nr); \ +__asm__ ( \ + ".text\n\t" \ + "IRQ" #nr "_interrupt:\n\t" \ + SAVE_ALL \ + KGDB_FIXUP \ + "move.d "#nr",$r10\n\t" \ + "move.d $sp,$r12\n\t" \ + "jsr crisv32_do_IRQ\n\t" \ + "moveq 0,$r11\n\t" \ + "jump ret_from_intr\n\t" \ + "nop\n\t"); + +#endif /* __ASSEMBLY__ */ +#endif /* _ASM_ARCH_IRQ_H */ |