arch/arm/mach-versatile/include/mach/entry-macro.S

   1 /*
   2  * arch/arm/mach-versatile/include/mach/entry-macro.S
   3  *
   4  * Low-level IRQ helper macros for Versatile platforms
   5  *
   6  * This file is licensed under  the terms of the GNU General Public
   7  * License version 2. This program is licensed "as is" without any
   8  * warranty of any kind, whether express or implied.
   9  */
  10 #include <mach/hardware.h>
  11 #include <asm/hardware/vic.h>
  12
  13                 .macro  disable_fiq
  14                 .endm
  15
  16                 .macro  get_irqnr_preamble, base, tmp
  17                 ldr     \base, =IO_ADDRESS(VERSATILE_VIC_BASE)
  18                 .endm
  19
  20                 .macro  arch_ret_to_user, tmp1, tmp2
  21                 .endm
  22
  23                 .macro  get_irqnr_and_base, irqnr, irqstat, base, tmp
  24                 ldr     \irqstat, [\base, #VIC_IRQ_STATUS]      @ get masked status
  25                 mov     \irqnr, #0
  26                 teq     \irqstat, #0
  27                 beq     1003f
  28
  29 1001:           tst     \irqstat, #15
  30                 bne     1002f
  31                 add     \irqnr, \irqnr, #4
  32                 movs    \irqstat, \irqstat, lsr #4
  33                 bne     1001b
  34 1002:           tst     \irqstat, #1
  35                 bne     1003f
  36                 add     \irqnr, \irqnr, #1
  37                 movs    \irqstat, \irqstat, lsr #1
  38                 bne     1002b
  39 1003:           /* EQ will be set if no irqs pending */
  40
  41 @               clz     \irqnr, \irqstat
  42 @1003:          /* EQ will be set if we reach MAXIRQNUM */
  43                 .endm
  44