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  1. /*
  2.  * include/asm-arm/arch-at91rm9200/entry-macro.S
  3.  *
  4.  *  Copyright (C) 2003-2005 SAN People
  5.  *
  6.  * Low-level IRQ helper macros for AT91RM9200 platforms
  7.  *
  8.  * This file is licensed under the terms of the GNU General Public
  9.  * License version 2. This program is licensed "as is" without any
  10.  * warranty of any kind, whether express or implied.
  11.  */
  12.  
  13. #include <asm/hardware.h>
  14.  
  15.     .macro    disable_fiq
  16.     .endm
  17.  
  18.     .macro    get_irqnr_and_base, irqnr, irqstat, base, tmp
  19.     ldr    \base, =(AT91_VA_BASE_SYS)        @ base virtual address of SYS peripherals
  20.     ldr    \irqnr, [\base, #AT91_AIC_IVR]        @ read IRQ vector register: de-asserts nIRQ to processor (and clears interrupt)
  21.     ldr    \irqstat, [\base, #AT91_AIC_ISR]    @ read interrupt source number
  22.     teq    \irqstat, #0                @ ISR is 0 when no current interrupt, or spurious interrupt
  23.     streq    \tmp, [\base, #AT91_AIC_EOICR]        @ not going to be handled further, then ACK it now.
  24.     .endm
  25.  
  26.