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/*
* Low-level IRQ helper macros
*
* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <mach/hardware.h>
#include <asm/hardware/gic.h>
.macro disable_fiq
.endm
.macro get_irqnr_preamble, base, tmp
ldr \base, =gic_cpu_base_addr
ldr \base, [\base]
.endm
.macro arch_ret_to_user, tmp1, tmp2
.endm
/*
* The interrupt numbering scheme is defined in the
* interrupt controller spec. To wit:
*
* Migrated the code from ARM MP port to be more consistant
* with interrupt processing , the following still holds true
* however, all interrupts are treated the same regardless of
* if they are local IPI or PPI
*
* Interrupts 0-15 are IPI
* 16-31 are PPI
* (16-18 are the timers)
* 32-1020 are global
* 1021-1022 are reserved
* 1023 is "spurious" (no interrupt)
*
* A simple read from the controller will tell us the number of the
* highest priority enabled interrupt. We then just need to check
* whether it is in the valid range for an IRQ (0-1020 inclusive).
*
* Base ARM code assumes that the local (private) peripheral interrupts
* are not valid, we treat them differently, in that the privates are
* handled like normal shared interrupts with the exception that only
* one processor can register the interrupt and the handler must be
* the same for all processors.
*/
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp
ldr \irqstat, [\base, #GIC_CPU_INTACK] /* bits 12-10 =srcCPU,
9-0 =int # */
bic \irqnr, \irqstat, #0x1c00 @mask src
cmp \irqnr, #15
ldr \tmp, =1021
cmpcc \irqnr, \irqnr
cmpne \irqnr, \tmp
cmpcs \irqnr, \irqnr
.endm
/* We assume that irqstat (the raw value of the IRQ acknowledge
* register) is preserved from the macro above.
* If there is an IPI, we immediately signal end of interrupt on the
* controller, since this requires the original irqstat value which
* we won't easily be able to recreate later.
*/
.macro test_for_ipi, irqnr, irqstat, base, tmp
bic \irqnr, \irqstat, #0x1c00
cmp \irqnr, #16
strcc \irqstat, [\base, #GIC_CPU_EOI]
cmpcs \irqnr, \irqnr
.endm
/* As above, this assumes that irqstat and base are preserved.. */
.macro test_for_ltirq, irqnr, irqstat, base, tmp
bic \irqnr, \irqstat, #0x1c00
mov \tmp, #0
cmp \irqnr, #16
moveq \tmp, #1
streq \irqstat, [\base, #GIC_CPU_EOI]
cmp \tmp, #0
.endm
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