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>
14 #include <asm/hardware/gic.h>
19 .macro get_irqnr_preamble, base, tmp
20 ldr \base, =gic_cpu_base_addr
22 mrc p15, 0, \tmp, c0, c0, 5
25 addeq \base, \base, #EXYNOS4_GIC_BANK_OFFSET
28 .macro arch_ret_to_user, tmp1, tmp2
32 * The interrupt numbering scheme is defined in the
33 * interrupt controller spec. To wit:
35 * Interrupts 0-15 are IPI
37 * 29-31 are local. We allow 30 to be used for the watchdog.
39 * 1021-1022 are reserved
40 * 1023 is "spurious" (no interrupt)
42 * For now, we ignore all local interrupts so only return an interrupt if it's
43 * between 30 and 1020. The test_for_ipi routine below will pick up on IPIs.
45 * A simple read from the controller will tell us the number of the highest
46 * priority enabled interrupt. We then just need to check whether it is in the
47 * valid range for an IRQ (30-1020 inclusive).
50 .macro get_irqnr_and_base, irqnr, irqstat, base, tmp
52 ldr \irqstat, [\base, #GIC_CPU_INTACK] /* bits 12-10 = src CPU, 9-0 = int # */
56 bic \irqnr, \irqstat, #0x1c00
62 addne \irqnr, \irqnr, #32
66 /* We assume that irqstat (the raw value of the IRQ acknowledge
67 * register) is preserved from the macro above.
68 * If there is an IPI, we immediately signal end of interrupt on the
69 * controller, since this requires the original irqstat value which
70 * we won't easily be able to recreate later.
73 .macro test_for_ipi, irqnr, irqstat, base, tmp
74 bic \irqnr, \irqstat, #0x1c00
76 strcc \irqstat, [\base, #GIC_CPU_EOI]
80 /* As above, this assumes that irqstat and base are preserved.. */
82 .macro test_for_ltirq, irqnr, irqstat, base, tmp