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r: 225739
b: refs/heads/master
c: c4d8c80
h: refs/heads/master
i:
  225737: 67364a4
  225735: 31d7c5a
v: v3
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Magnus Damm authored and Russell King committed Dec 7, 2010
1 parent b9959b1 commit 75b2a9e
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2 changes: 1 addition & 1 deletion [refs]
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---
refs/heads/master: 960351fb8e980f0aa6682f11630ff98d3a18e2c0
refs/heads/master: c4d8c80f59f0611d747399a774ebef71f517a30c
60 changes: 1 addition & 59 deletions trunk/arch/arm/mach-realview/include/mach/entry-macro.S
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* warranty of any kind, whether express or implied.
*/
#include <mach/hardware.h>
#include <asm/hardware/gic.h>
#include <asm/hardware/entry-macro-gic.S>

.macro disable_fiq
.endm
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.macro arch_ret_to_user, tmp1, tmp2
.endm

/*
* The interrupt numbering scheme is defined in the
* interrupt controller spec. To wit:
*
* Interrupts 0-15 are IPI
* 16-28 are reserved
* 29-31 are local. We allow 30 to be used for the watchdog.
* 32-1020 are global
* 1021-1022 are reserved
* 1023 is "spurious" (no interrupt)
*
* For now, we ignore all local interrupts so only return an interrupt if it's
* between 30 and 1020. The test_for_ipi routine below will pick up on IPIs.
*
* 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 (30-1020 inclusive).
*/

.macro get_irqnr_and_base, irqnr, irqstat, base, tmp

ldr \irqstat, [\base, #GIC_CPU_INTACK] /* bits 12-10 = src CPU, 9-0 = int # */

ldr \tmp, =1021

bic \irqnr, \irqstat, #0x1c00

cmp \irqnr, #29
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, #29
moveq \tmp, #1
streq \irqstat, [\base, #GIC_CPU_EOI]
cmp \tmp, #0
.endm

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