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/*
 * linux/arch/arm/lib/irqs.S
 *
 * Copyright (C) 1995, 1996 Russell King. (rmk@ecs.soton.ac.uk)
 *
 * Interrupt wrappers - handles disabling & re-enabling interrupts
 */

#include <asm/assembler.h>

@ IRQ stubs

@ IRQ stubs entered with:
@ r0 = IRQ number
@ r1 = regs
@ r4 = IRQ_MSKD         (only for CTB_OS)
@ return 0 for normal irq

                .text
/*
 * Disable interrupt & print a message
 */
LC0:            .long   _intr_count

                .globl  _bad_IRQ_interrupt
_bad_IRQ_interrupt:
                mov     r9, lr
                mov     r5, #1
                mov     r5, r5, lsl r0
                strb    r5, [r4]
                bl      _bad_IRQ
                mov     r0, #0
                mov     pc, r9

                .globl  _fast_IRQ_interrupt
_fast_IRQ_interrupt:
                mov     r9, lr
                mov     r5, #1
                mov     r5, r5, lsl r0
                strb    r5, [r4]
                ldr     r6, LC0
                ldr     r7, [r6]
                add     r2, r7, #1
                str     r2, [r6]
                bl      _do_IRQ
                mrs     r2, cpsr
                orr     r2, r2, #I_BIT
                msr     cpsr, r2
                str     r7, [r6]
                sub     r4, r4, #0x400000
                strb    r5, [r4]
                mov     r0, #1
                mov     pc, r9

                .globl  _IRQ_interrupt
_IRQ_interrupt:
                mov     r9, lr
                mov     r5, #1
                mov     r5, r5, lsl r0
                strb    r5, [r4]                        @ Disable interrupt source
                ldr     r6, LC0
                ldr     r7, [r6]
                add     r2, r7, #1
                str     r2, [r6]
                mrs     r8, cpsr                        @ Enable interrupts
                bic     r2, r8, #I_BIT
                msr     cpsr, r2
                bl      _do_IRQ
                msr     cpsr, r8                        @ Restore interrupts
                str     r7, [r6]
                sub     r4, r4, #0x400000
                strb    r5, [r4]                        @ Re-enable interrupt source
                mov     r0, #0
                mov     pc, r9

                .globl  _timer_IRQ_interrupt
_timer_IRQ_interrupt:
                mov     r9, lr
                mov     r5, #1
                mov     r5, r5, lsl r0
                strb    r5, [r4]                        @ Disable interrupt source
                ldr     r6, LC0
                ldr     r7, [r6]
                add     r2, r7, #1
                str     r2, [r6]
                mrs     r8, cpsr
                bl      _do_IRQ
                msr     cpsr, r8                        @ Restore interrupts
                str     r7, [r6]
                sub     r4, r4, #0x400000
                strb    r5, [r4]                        @ Re-enable interrupt source
                mov     r0, #0
                mov     pc, r9

                .globl  _probe_IRQ_interrupt
_probe_IRQ_interrupt:
                mov     r9, lr
                mov     r5, #1
                mov     r5, r5, lsl r0
                add     r6, r4, #0x400000
                strb    r5, [r6]
                ldr     r6, LC0+4
                ldrb    r4, [r6]
                bic     r4, r4, r5
                strb    r4, [r6]
                mov     pc, r9

                .global _bad_IRQ
_bad_IRQ:       mov     r1, r0
                adr     r0, Lmsg
                b       _printk

Lmsg:           .ascii  "Bad interrupt %d received!\n\0"
                .align