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Viewing changes to arch/arm/mach-spear3xx/include/mach/entry-macro.S

  • Committer: Package Import Robot
  • Author(s): Alessio Igor Bogani
  • Date: 2011-10-26 11:13:05 UTC
  • Revision ID: package-import@ubuntu.com-20111026111305-tz023xykf0i6eosh
Tags: upstream-3.2.0
Import upstream version 3.2.0

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arch/arm/mach-spear3xx/include/mach/entry-macro.S
 
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/*
 
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 * arch/arm/mach-spear3xx/include/mach/entry-macro.S
 
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 *
 
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 * Low-level IRQ helper macros for SPEAr3xx machine family
 
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 *
 
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 * Copyright (C) 2009 ST Microelectronics
 
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 * Viresh Kumar<viresh.kumar@st.com>
 
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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 <asm/hardware/vic.h>
 
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#include <mach/hardware.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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                .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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                ldr     \base, =VA_SPEAR3XX_ML1_VIC_BASE
 
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                ldr     \irqstat, [\base, #VIC_IRQ_STATUS]      @ get status
 
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                teq     \irqstat, #0
 
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                beq     1001f                           @ this will set/reset
 
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                                                        @ zero register
 
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                /*
 
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                 * Following code will find bit position of least significang
 
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                 * bit set in irqstat, using following equation
 
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                 * least significant bit set in n = (n & ~(n-1))
 
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                 */
 
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                sub     \tmp, \irqstat, #1              @ tmp = irqstat - 1
 
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                mvn     \tmp, \tmp                      @ tmp = ~tmp
 
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                and     \irqstat, \irqstat, \tmp        @ irqstat &= tmp
 
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                /* Now, irqstat is = bit no. of 1st bit set in vic irq status */
 
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                clz     \tmp, \irqstat                  @ tmp = leading zeros
 
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                rsb     \irqnr, \tmp, #0x1F             @ irqnr = 32 - tmp - 1
 
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1001:           /* EQ will be set if no irqs pending */
 
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                .endm