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Text File  |  2008-12-24  |  1.0 KB  |  33 lines
  1. /*
  2.  * arch/arm/mach-at91/include/mach/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 <mach/hardware.h>
  14. #include <mach/at91_aic.h>
  15.  
  16.     .macro    disable_fiq
  17.     .endm
  18.  
  19.     .macro  get_irqnr_preamble, base, tmp
  20.     ldr    \base, =(AT91_VA_BASE_SYS + AT91_AIC)        @ base virtual address of AIC peripheral
  21.     .endm
  22.  
  23.     .macro  arch_ret_to_user, tmp1, tmp2
  24.     .endm
  25.  
  26.     .macro    get_irqnr_and_base, irqnr, irqstat, base, tmp
  27.     ldr    \irqnr, [\base, #(AT91_AIC_IVR - AT91_AIC)]    @ read IRQ vector register: de-asserts nIRQ to processor (and clears interrupt)
  28.     ldr    \irqstat, [\base, #(AT91_AIC_ISR - AT91_AIC)]    @ read interrupt source number
  29.     teq    \irqstat, #0                    @ ISR is 0 when no current interrupt, or spurious interrupt
  30.     streq    \tmp, [\base, #(AT91_AIC_EOICR - AT91_AIC)]    @ not going to be handled further, then ACK it now.
  31.     .endm
  32.  
  33.