| /* |
| * arch/arm/mach-realview/include/mach/entry-macro.S |
| * |
| * Low-level IRQ helper macros for RealView platforms |
| * |
| * 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: |
| * |
| * 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 |
