7627dc802a
Provide a standard get_irqnr_preamble assembler macro for platforms to use, which retrieves the base address of the GIC CPU interface from gic_cpu_base_addr. Allow platforms to override this by defining HAVE_GET_IRQNR_PREAMBLE. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
76 lines
2.1 KiB
ArmAsm
76 lines
2.1 KiB
ArmAsm
/*
|
|
* arch/arm/include/asm/hardware/entry-macro-gic.S
|
|
*
|
|
* Low-level IRQ helper macros for GIC
|
|
*
|
|
* 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 <asm/hardware/gic.h>
|
|
|
|
#ifndef HAVE_GET_IRQNR_PREAMBLE
|
|
.macro get_irqnr_preamble, base, tmp
|
|
ldr \base, =gic_cpu_base_addr
|
|
ldr \base, [\base]
|
|
.endm
|
|
#endif
|
|
|
|
/*
|
|
* 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
|