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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/arm/mach-mv78xx0/include/mach/entry-macro.S
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/*

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 * arch/arm/mach-mv78xx0/include/mach/entry-macro.S

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 *

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 * Low-level IRQ helper macros for Marvell MV78xx0 platforms

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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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#include <mach/bridge-regs.h>

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	.macro  disable_fiq

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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_preamble, base, tmp

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	ldr	\base, =IRQ_VIRT_BASE

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	.endm

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	.macro  get_irqnr_and_base, irqnr, irqstat, base, tmp

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	@ check low interrupts

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	ldr	\irqstat, [\base, #IRQ_CAUSE_LOW_OFF]

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	ldr	\tmp, [\base, #IRQ_MASK_LOW_OFF]

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	mov	\irqnr, #31

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	ands	\irqstat, \irqstat, \tmp

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	bne	1001f

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	@ if no low interrupts set, check high interrupts

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	ldr	\irqstat, [\base, #IRQ_CAUSE_HIGH_OFF]

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	ldr	\tmp, [\base, #IRQ_MASK_HIGH_OFF]

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	mov	\irqnr, #63

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	ands	\irqstat, \irqstat, \tmp

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	bne	1001f

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	@ if no high interrupts set, check error interrupts

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	ldr	\irqstat, [\base, #IRQ_CAUSE_ERR_OFF]

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	ldr	\tmp, [\base, #IRQ_MASK_ERR_OFF]

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	mov	\irqnr, #95

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	ands	\irqstat, \irqstat, \tmp

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	@ find first active interrupt source

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1001:	clzne	\irqstat, \irqstat

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	subne	\irqnr, \irqnr, \irqstat

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	.endm

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