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/*
* Interrupt handling assembler for Linux/CRIS
*
* Copyright (c) 2000 Axis Communications AB
*
* Authors: Bjorn Wesen (bjornw@axis.com)
*
*/
#ifndef _ASM_IRQ_H
#define _ASM_IRQ_H
/*
* linux/include/asm-cris/irq.h
*/
#include <linux/linkage.h>
#include <asm/segment.h>
#include <asm/sv_addr_ag.h>
#define NR_IRQS 26 /* TODO: what is this for Etrax100/LX ? */
extern void disable_irq(unsigned int);
extern void enable_irq(unsigned int);
#define disable_irq_nosync disable_irq
#define enable_irq_nosync enable_irq
/* our fine, global, etrax irq vector! the pointer lives in the head.S file. */
typedef void (*irqvectptr)(void);
struct etrax_interrupt_vector {
irqvectptr v[256];
};
extern struct etrax_interrupt_vector *etrax_irv;
void set_int_vector(int n, irqvectptr addr, irqvectptr saddr);
void set_break_vector(int n, irqvectptr addr);
#define __STR(x) #x
#define STR(x) __STR(x)
/* SAVE_ALL saves registers so they match pt_regs */
#define SAVE_ALL \
"push irp\n\t" /* push instruction pointer */ \
"push srp\n\t" /* push subroutine return pointer */ \
"push dccr\n\t" /* push condition codes */ \
"push mof\n\t" /* push multiply overflow reg */ \
"di\n\t" /* need to disable irq's at this point */\
"subq 14*4,sp\n\t" /* make room for r0-r13 */ \
"movem r13,[sp]\n\t" /* push the r0-r13 registers */ \
"push r10\n\t" /* push orig_r10 */ \
"clear.d [sp=sp-4]\n\t" /* frametype - this is a normal stackframe */
/* BLOCK_IRQ and UNBLOCK_IRQ do the same as mask_irq and unmask_irq in irq.c */
#define BLOCK_IRQ(mask,nr) \
"move.d " #mask ",r0\n\t" \
"move.d r0,[0xb00000d8]\n\t"
#define UNBLOCK_IRQ(mask) \
"move.d " #mask ",r0\n\t" \
"move.d r0,[0xb00000dc]\n\t"
#define IRQ_NAME2(nr) nr##_interrupt(void)
#define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
#define sIRQ_NAME(nr) IRQ_NAME2(sIRQ##nr)
#define BAD_IRQ_NAME(nr) IRQ_NAME2(bad_IRQ##nr)
/* the asm IRQ handler makes sure the causing IRQ is blocked, then it calls
* do_IRQ (with irq disabled still). after that it unblocks and jumps to
* ret_from_intr (entry.S)
*/
#define BUILD_IRQ(nr,mask) \
void IRQ_NAME(nr); \
void sIRQ_NAME(nr); \
void BAD_IRQ_NAME(nr); \
__asm__ ( \
".text\n\t" \
"_IRQ" #nr "_interrupt:\n\t" \
SAVE_ALL \
"_sIRQ" #nr "_interrupt:\n\t" /* shortcut for the multiple irq handler */ \
BLOCK_IRQ(mask,nr) /* this must be done to prevent irq loops when we ei later */ \
"moveq "#nr",r10\n\t" \
"move.d sp,r11\n\t" \
"jsr _do_IRQ\n\t" /* irq.c, r10 and r11 are arguments */ \
UNBLOCK_IRQ(mask) \
"moveq 0,r9\n\t" /* make ret_from_intr realise we came from an irq */ \
"jump _ret_from_intr\n\t" \
"_bad_IRQ" #nr "_interrupt:\n\t" \
"push r0\n\t" \
BLOCK_IRQ(mask,nr) \
"pop r0\n\t");
#endif /* _ASM_IRQ_H */
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