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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/arm/include/asm/entry-macro-vic2.S
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/* arch/arm/include/asm/entry-macro-vic2.S

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 *

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 * Originally arch/arm/mach-s3c6400/include/mach/entry-macro.S

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 *

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 * Copyright 2008 Openmoko, Inc.

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 * Copyright 2008 Simtec Electronics

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 *	http://armlinux.simtec.co.uk/

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 *	Ben Dooks <[email protected]>

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 *

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 * Low-level IRQ helper macros for a device with two VICs

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 *

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 * This file is licensed under  the terms of the GNU General Public

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 * License version 2. This program is licensed "as is" without any

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 * warranty of any kind, whether express or implied.

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*/

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/* This should be included from <mach/entry-macro.S> with the necessary

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 * defines for virtual addresses and IRQ bases for the two vics.

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 *

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 * The code needs the following defined:

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 *	IRQ_VIC0_BASE	IRQ number of VIC0's first IRQ

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 *	IRQ_VIC1_BASE	IRQ number of VIC1's first IRQ

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 *	VA_VIC0		Virtual address of VIC0

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 *	VA_VIC1		Virtual address of VIC1

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 *

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 * Note, code assumes VIC0's virtual address is an ARM immediate constant

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 * away from VIC1.

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*/

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#include <asm/hardware/vic.h>

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	.macro	disable_fiq

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	.endm

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	.macro	get_irqnr_preamble, base, tmp

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	ldr	\base, =VA_VIC0

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	.endm

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	.macro	arch_ret_to_user, tmp1, tmp2

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	.endm

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	.macro	get_irqnr_and_base, irqnr, irqstat, base, tmp

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	@ check the vic0

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	mov	\irqnr, #IRQ_VIC0_BASE + 31

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	ldr	\irqstat, [ \base, # VIC_IRQ_STATUS ]

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	teq	\irqstat, #0

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	@ otherwise try vic1

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	addeq	\tmp, \base, #(VA_VIC1 - VA_VIC0)

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	addeq	\irqnr, \irqnr, #(IRQ_VIC1_BASE - IRQ_VIC0_BASE)

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	ldreq	\irqstat, [ \tmp, # VIC_IRQ_STATUS ]

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	teqeq	\irqstat, #0

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	clzne	\irqstat, \irqstat

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	subne	\irqnr, \irqnr, \irqstat

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	.endm

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