1 /* arch/arm/mach-exynos4/include/mach/entry-macro.S
3 * Cloned from arch/arm/mach-realview/include/mach/entry-macro.S
5 * Low-level IRQ helper macros for EXYNOS4 platforms
7 * This file is licensed under the terms of the GNU General Public
8 * License version 2. This program is licensed "as is" without any
9 * warranty of any kind, whether express or implied.
12 #include <mach/hardware.h>
13 #include <asm/hardware/gic.h>
18 .macro get_irqnr_preamble, base, tmp
19 ldr \base, =gic_cpu_base_addr
23 .macro arch_ret_to_user, tmp1, tmp2
27 * The interrupt numbering scheme is defined in the
28 * interrupt controller spec. To wit:
30 * Interrupts 0-15 are IPI
32 * 29-31 are local. We allow 30 to be used for the watchdog.
34 * 1021-1022 are reserved
35 * 1023 is "spurious" (no interrupt)
37 * For now, we ignore all local interrupts so only return an interrupt if it's
38 * between 30 and 1020. The test_for_ipi routine below will pick up on IPIs.
40 * A simple read from the controller will tell us the number of the highest
41 * priority enabled interrupt. We then just need to check whether it is in the
42 * valid range for an IRQ (30-1020 inclusive).
45 .macro get_irqnr_and_base, irqnr, irqstat, base, tmp
47 ldr \irqstat, [\base, #GIC_CPU_INTACK] /* bits 12-10 = src CPU, 9-0 = int # */
51 bic \irqnr, \irqstat, #0x1c00
57 addne \irqnr, \irqnr, #32
61 /* We assume that irqstat (the raw value of the IRQ acknowledge
62 * register) is preserved from the macro above.
63 * If there is an IPI, we immediately signal end of interrupt on the
64 * controller, since this requires the original irqstat value which
65 * we won't easily be able to recreate later.
68 .macro test_for_ipi, irqnr, irqstat, base, tmp
69 bic \irqnr, \irqstat, #0x1c00
71 strcc \irqstat, [\base, #GIC_CPU_EOI]
75 /* As above, this assumes that irqstat and base are preserved.. */
77 .macro test_for_ltirq, irqnr, irqstat, base, tmp
78 bic \irqnr, \irqstat, #0x1c00
82 streq \irqstat, [\base, #GIC_CPU_EOI]