/* * include/asm-arm/arch-realview/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 <asm/hardware.h> #include <asm/hardware/gic.h> .macro disable_fiq .endm .macro get_irqnr_preamble, base, tmp .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 \base, =IO_ADDRESS(REALVIEW_GIC_CPU_BASE) 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