182 lines
5.9 KiB
ArmAsm
182 lines
5.9 KiB
ArmAsm
/* $NetBSD: irq_dispatch.S,v 1.2 2003/01/03 00:38:16 thorpej Exp $ */
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/*
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* Copyright (c) 2002 Fujitsu Component Limited
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* Copyright (c) 2002 Genetec Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of The Fujitsu Component Limited nor the name of
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* Genetec corporation may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY FUJITSU COMPONENT LIMITED AND GENETEC
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* CORPORATION ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL FUJITSU COMPONENT LIMITED OR GENETEC
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* CORPORATION BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 2002, 2003 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Jason R. Thorpe for Wasabi Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "assym.h"
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#include <machine/asm.h>
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#include <machine/cpu.h>
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#include <machine/frame.h>
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#include "opt_arm_intr_impl.h"
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#ifdef ARM_INTR_IMPL
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#include ARM_INTR_IMPL
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#else
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#error ARM_INTR_IMPL not defined
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#endif
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#ifndef ARM_IRQ_HANDLER
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#error ARM_IRQ_HANDLER not defined
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#endif
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/*
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* irq_entry:
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* Main entry point for the IRQ vector. This is a generic version
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* which can be used by different platforms.
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*/
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.text
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.align 0
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.Lastpending:
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.word _C_LABEL(astpending)
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.Lcurrent_intr_depth:
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.word _C_LABEL(current_intr_depth)
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ASENTRY_NP(irq_entry)
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sub lr, lr, #0x00000004 /* Adjust the lr */
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PUSHFRAMEINSVC /* Push an interrupt frame */
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/*
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* Increment the interrupt nesting depth and call the interrupt
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* dispatch routine. We've pushed a frame, so we can safely use
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* callee-saved regs here. We use the following registers, which
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* we expect to presist:
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*
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* r5 address of `current_intr_depth' variable
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* r6 old value of `current_intr_depth'
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*/
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ldr r5, .Lcurrent_intr_depth
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mov r0, sp /* arg for dispatcher */
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ldr r6, [r5]
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add r1, r6, #1
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str r1, [r5]
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bl ARM_IRQ_HANDLER
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/*
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* Restore the old interrupt depth value (which should be the
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* same as decrementing it at this point).
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*/
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str r6, [r5]
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/*
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* If we're returning to user mode, check for pending ASTs.
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*/
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ldr r0, [sp] /* Get the SPSR from stack */
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and r0, r0, #(PSR_MODE) /* Test for USR32 mode before the IRQ */
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teq r0, #(PSR_USR32_MODE)
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bne 2f /* Nope, get out now */
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1:
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ldr r0, .Lastpending /* Do we have an AST pending? */
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ldr r1, [r0]
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teq r1, #0x00000000
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beq 2f /* Nope, get out now */
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mov r1, #0x00000000
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str r1, [r0] /* Clear astpending */
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mrs r4, cpsr /* save CPSR */
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bic r0, r4, #(I32_bit) /* Enable IRQs */
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msr cpsr_c, r0
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mov r0, sp
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bl _C_LABEL(ast) /* ast(frame) */
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msr cpsr_c, r4 /* Disable IRQs */
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b 1b /* Check for more ASTs */
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2:
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PULLFRAMEFROMSVCANDEXIT
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movs pc, lr /* Exit */
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.bss
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.align 0
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.global _C_LABEL(astpending)
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_C_LABEL(astpending):
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.word 0
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.global _C_LABEL(current_intr_depth)
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_C_LABEL(current_intr_depth):
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.word 0
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/*
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* XXX Provide intrnames/intrcnt for legacy code, but
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* don't actually use them.
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*/
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.global _C_LABEL(intrnames), _C_LABEL(eintrnames)
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.global _C_LABEL(intrcnt), _C_LABEL(eintrcnt)
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_C_LABEL(intrnames):
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_C_LABEL(eintrnames):
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.global _C_LABEL(intrcnt), _C_LABEL(sintrcnt), _C_LABEL(eintrcnt)
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_C_LABEL(intrcnt):
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_C_LABEL(eintrcnt):
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